/* ════════════════════════════════════════════════════════════════════
   Pingable — "Beacon" design system  ·  Network-Operations (NOC) aesthetic
   Deep slate navy · signal-green "ping reply" accent · status-light language
   Inter + IBM Plex Sans Thai + JetBrains Mono · 8px scale · WCAG-aware
   ════════════════════════════════════════════════════════════════════ */

/* ── Design tokens ───────────────────────────────────────────────── */
:root {
  /* Surfaces — deep slate navy (NOC console) */
  --bg:        #080d17;
  --bg-elev:   #0c1320;
  --surface:   #111a2b;
  --surface-2: #182539;
  --border:    #20304a;
  --border-h:  #314563;

  /* Text */
  --text:    #e9eef7;
  --muted:   #94a3b8;   /* AA on --bg */
  --faint:   #5b6b85;

  /* Signal green — the brand signature (ping reply / link-up) */
  --signal:     #22c55e;
  --signal-h:   #4ade80;
  --signal-dim: #16a34a;
  --signal-ink: #032012;
  --signal-soft: rgba(34,197,94,.12);

  /* Cool secondary (data / informational) */
  --sky:    #38bdf8;
  --indigo: #818cf8;

  /* Energy core — Echo's cosmic accent (plasma violet).
     Secondary to signal-green; powers the mascot core + key highlights. */
  --core:      #a855f7;
  --core-h:    #c084fc;
  --core-dim:  #7c3aed;
  --core-ink:  #1a0733;
  --core-soft: rgba(168,85,247,.14);
  --core-glow: 0 0 22px -2px rgba(168,85,247,.7);

  /* Status-light semantics (NOC) */
  --up:       #22c55e;
  --warning:  #f5b513;
  --warning-h:#fbbf24;
  --down:     #f43f5e;
  --down-h:   #fb7185;
  --info:     #38bdf8;
  --success:  #22c55e;
  --success-h:#4ade80;
  --danger:   #f43f5e;
  --danger-h: #fb7185;

  /* Accent composites */
  --gradient:      linear-gradient(135deg, #22c55e, #059669);
  --gradient-soft: linear-gradient(135deg, rgba(34,197,94,.18), rgba(56,189,248,.12));
  --gradient-core: linear-gradient(140deg, #22c55e 0%, #38bdf8 45%, #a855f7 100%); /* signal→plasma fusion */
  --glow:          0 0 0 1px rgba(34,197,94,.34), 0 12px 38px -10px rgba(34,197,94,.55);

  /* Spacing scale (8px base) */
  --s-1: .25rem; --s-2: .5rem; --s-3: .75rem; --s-4: 1rem;
  --s-5: 1.5rem; --s-6: 2rem; --s-7: 3rem; --s-8: 4rem;

  /* Radius */
  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 24px; --r-full: 999px;

  /* Elevation */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.45);
  --shadow-md: 0 10px 28px -14px rgba(0,0,0,.75);
  --shadow-lg: 0 28px 64px -22px rgba(0,0,0,.9);

  /* Typography — Latin via Inter, Thai via IBM Plex Sans Thai */
  --font-display: "Inter", "IBM Plex Sans Thai", system-ui, sans-serif;
  --font-body:    "Inter", "IBM Plex Sans Thai", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono:    "JetBrains Mono", "Cascadia Code", Consolas, monospace;

  /* Layout */
  --nav-h: 62px;
  --maxw:  1180px;
}

/* ── Reset / Base ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body { height: 100%; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* Ambient: faint topology grid + signal-green glow, behind everything */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(148,163,184,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,163,184,.04) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(125% 80% at 50% 0%, #000 38%, transparent 100%);
          mask-image: radial-gradient(125% 80% at 50% 0%, #000 38%, transparent 100%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(52rem 38rem at 8% -10%, rgba(34,197,94,.13), transparent 58%),
    radial-gradient(44rem 34rem at 100% 2%, rgba(56,189,248,.08), transparent 55%);
  pointer-events: none;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.35; letter-spacing: -.018em; }

a { color: var(--signal-h); text-decoration: none; transition: color .15s; }
a:hover { color: var(--signal); }

main { flex: 1; }

/* Icons (inline SVG via _icons.njk) */
.ico { display: inline-block; vertical-align: -.18em; flex: none; }

/* ── Accessibility ───────────────────────────────────────────────── */
.skip-link {
  position: absolute; top: var(--s-2); left: var(--s-2); z-index: 9999;
  padding: var(--s-2) var(--s-4); background: var(--signal); color: var(--signal-ink);
  font-weight: 700; border-radius: var(--r-md); font-size: .9rem;
  transform: translateY(-200%); transition: transform .15s;
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; border-radius: var(--r-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── Utility ─────────────────────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(120deg, var(--signal-h), var(--sky));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.container { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--s-6); }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: var(--s-1) var(--s-3); border: 1px solid var(--border);
  border-radius: var(--r-full); background: var(--surface);
  color: var(--muted); font-size: .82rem; font-weight: 500;
}
.dot-live {
  width: 8px; height: 8px; border-radius: 50%; flex: none;
  background: var(--signal); box-shadow: 0 0 0 0 rgba(34,197,94,.6);
  animation: live-pulse 2s ease-out infinite;
}
@keyframes live-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(34,197,94,.55); }
  70%, 100% { box-shadow: 0 0 0 7px rgba(34,197,94,0); }
}

/* ── Navbar ──────────────────────────────────────────────────────── */
.navbar {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  padding: 0 var(--s-6); height: var(--nav-h);
  background: rgba(8,13,23,.72);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.nav-brand {
  display: inline-flex; align-items: center; gap: var(--s-3);
  font-family: var(--font-display); font-weight: 800; font-size: 1.18rem;
  letter-spacing: -.02em; color: var(--text);
}
.nav-brand:hover { color: var(--text); }
.brand-mark { display: inline-grid; place-items: center; flex: none; }

/* ── Echo mascot ───────────────────────────────────────────────
   Sentinel-chibi guardian. Armour = slate plates, eyes = signal-green
   glow, core = plasma-violet fused with a signal-green rim/pulse.
   `data-state` recolours the eyes + core for reactions. */
.echo { display: block; overflow: visible; --echo-eye: var(--signal-h); }
.echo-armor    { fill: var(--surface-2); stroke: var(--border-h); stroke-width: 1.2; }
.echo-armor-lt { fill: var(--surface);   stroke: var(--border-h); stroke-width: 1; }
.echo-fin      { fill: var(--border-h); }
.echo-sensor   { fill: var(--signal); filter: drop-shadow(0 0 3px var(--signal)); }
.echo-visor    { fill: #050a14; stroke: var(--border); stroke-width: 1; }
.echo-eye      { fill: var(--echo-eye); filter: drop-shadow(0 0 3px var(--echo-eye)); }
.echo-eye-arc  { fill: none; stroke: var(--echo-eye); stroke-width: 2.4; stroke-linecap: round; filter: drop-shadow(0 0 3px var(--echo-eye)); }
.echo-core     { fill: var(--core); stroke: var(--signal); stroke-width: 1.4; filter: drop-shadow(0 0 5px var(--core)); }
.echo-core-hot { fill: #f3e8ff; }
.echo-spark    { fill: var(--core-h); filter: drop-shadow(0 0 3px var(--core-h)); }
.echo-core-ring {
  fill: none; stroke: var(--signal); stroke-width: 1.3; opacity: 0;
  transform-box: fill-box; transform-origin: center;
  animation: echo-pulse 2.6s ease-out infinite;
}
.echo-core-ring.ring-2 { animation-delay: 1.3s; }
@keyframes echo-pulse { 0% { transform: scale(.55); opacity: .85; } 70%, 100% { transform: scale(1.5); opacity: 0; } }

/* gentle idle float for the full character */
.echo-full { animation: echo-bob 4s ease-in-out infinite; }
@keyframes echo-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-2.5px); } }

/* reaction states */
.echo[data-state="happy"] .echo-core,
.echo[data-state="celebrating"] .echo-core { filter: drop-shadow(0 0 9px var(--core-h)); }
.echo[data-state="celebrating"] .echo-core-ring { animation-duration: 1.4s; stroke: var(--core-h); }
.echo[data-state="thinking"]    { --echo-eye: var(--warning-h); }
.echo[data-state="thinking"] .echo-core-ring { animation-duration: 4s; }
.echo[data-state="sad"]         { --echo-eye: var(--down-h); }
.echo[data-state="sad"] .echo-core   { fill: var(--down); stroke: var(--down-h); filter: none; }
.echo[data-state="sad"] .echo-core-ring { animation: none; opacity: 0; }
.echo[data-state="sad"] .echo-sensor { fill: var(--faint); filter: none; }
.echo[data-state="sad"] .echo-full   { animation: none; }

/* ── Career rank gear (data-tier 1–6) ──────────────────────────────
   Echo earns gear as the learner levels up. Each tier owns an energy
   colour (--echo-accent); gear pieces are additive so the silhouette
   grows with seniority. See echoGear() in components/shared.js. */
.echo[data-tier]      { --echo-accent: var(--signal-h); }
.echo[data-tier="1"]  { --echo-accent: #6b8f72; }
.echo[data-tier="2"]  { --echo-accent: #2dd4bf; }
.echo[data-tier="3"]  { --echo-accent: #22d3ee; }
.echo[data-tier="4"]  { --echo-accent: #3b82f6; }
.echo[data-tier="5"]  { --echo-accent: #a855f7; }
.echo[data-tier="6"]  { --echo-accent: #fbbf24; }

.echo-genergy   { fill: none; stroke: var(--echo-accent); stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 2px var(--echo-accent)); }
.echo-genergy-f { fill: var(--echo-accent); filter: drop-shadow(0 0 2px var(--echo-accent)); }
.echo-gstrut    { fill: none; stroke: var(--border-h); stroke-linecap: round; }
.echo-gplate    { fill: var(--surface-2); stroke: var(--border-h); stroke-width: 1.2; stroke-linejoin: round; }
.echo-gplate-d  { fill: var(--surface);   stroke: var(--border-h); stroke-width: 1.3; stroke-linejoin: round; }
.echo-gbadge    { fill: #cbd5e1; stroke: #64748b; stroke-width: .8; }
.echo-gbadge-l  { fill: #64748b; }
.echo-cape      { fill: var(--surface); stroke: var(--echo-accent); stroke-width: 1.6; stroke-linejoin: round; opacity: .92; }
.echo-gold-f    { fill: #fbbf24; stroke: #b45309; stroke-width: 1; stroke-linejoin: round; }
.echo-gold-s    { fill: none; stroke: #fbbf24; stroke-width: 1.4; filter: drop-shadow(0 0 3px #fbbf24); }

/* Lv1 — rookie's core is still dim. Lv6 — armour is gilded. */
.echo[data-tier="1"] .echo-core-grp { opacity: .5; }
.echo[data-tier="6"] .echo-cape   { fill: #2a1f06; }
.echo[data-tier="6"] .echo-fin    { fill: #caa23a; }
.echo[data-tier="6"] .echo-sensor { fill: #fbbf24; filter: drop-shadow(0 0 3px #fbbf24); }
.echo[data-tier="6"] .echo-visor  { stroke: #caa23a; stroke-width: 1.4; }

@media (prefers-reduced-motion: reduce) {
  .echo-full, .echo-core-ring, .echo-spark { animation: none !important; }
  .echo-core-ring { opacity: .35; }
}

/* mascot placements */
.hero-visual { position: relative; }
.hero-mascot {
  position: absolute; top: -34px; right: 4px; z-index: 2;
  filter: drop-shadow(0 16px 30px rgba(168,85,247,.28));
}
.error-mascot { margin: 0 auto var(--s-3); }
.provision-mascot { margin: 0 auto var(--s-2); }
.grade-mascot { margin-bottom: var(--s-2); }
@media (max-width: 720px) { .hero-mascot { display: none; } }
.nav-links { display: flex; align-items: center; gap: var(--s-5); }
.nav-links a:not(.btn) {
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--muted); font-size: .95rem; font-weight: 500;
}
.nav-links a:not(.btn):hover { color: var(--text); }
.nav-links a:not(.btn) .ico { color: var(--faint); transition: color .15s; }
.nav-links a:not(.btn):hover .ico { color: var(--signal); }
.nav-links a.nav-active:not(.btn) { color: var(--signal-h); }
.nav-links a.nav-active:not(.btn) .ico { color: var(--signal); }
.nav-links a.nav-event:not(.btn) { color: var(--signal-h); font-weight: 600; }
.nav-links a.nav-event:not(.btn) .ico { color: var(--signal); }
.nav-user {
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--text); font-size: .9rem; font-weight: 500;
  padding: var(--s-1) var(--s-3); border: 1px solid var(--border); border-radius: var(--r-full);
}
.nav-user .ico { color: var(--signal); }
.btn-link {
  display: inline-flex; align-items: center; gap: var(--s-2);
  background: none; border: none; color: var(--muted);
  cursor: pointer; font: inherit; font-size: .95rem; padding: 0; transition: color .15s;
}
.btn-link:hover { color: var(--danger-h); }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  --_pad: .62rem 1.25rem;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  padding: var(--_pad); border-radius: var(--r-md);
  font-family: var(--font-display); font-size: .95rem; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; touch-action: manipulation;
  transition: transform .12s, box-shadow .2s, background .15s, border-color .15s, color .15s, opacity .15s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn .ico { margin-block: -2px; }
.btn-primary { background: var(--gradient); color: var(--signal-ink); box-shadow: 0 6px 22px -8px rgba(34,197,94,.6); }
.btn-primary:hover { box-shadow: var(--glow); color: var(--signal-ink); }
.btn-outline { background: transparent; border-color: var(--border-h); color: var(--text); }
.btn-outline:hover { border-color: var(--signal); color: var(--signal-h); }
.btn-danger { background: rgba(244,63,94,.14); border-color: rgba(244,63,94,.4); color: var(--danger-h); }
.btn-danger:hover { background: rgba(244,63,94,.22); border-color: var(--danger); }
.btn-ghost { background: var(--surface-2); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--border-h); }
.btn-secondary { background: var(--surface-2); border-color: var(--border-h); color: var(--text); }
.btn-secondary:hover { border-color: var(--signal); color: var(--signal-h); }
.btn-lg { --_pad: .82rem 1.85rem; font-size: 1.05rem; }
.btn-sm { --_pad: .42rem .9rem; font-size: .85rem; }
.btn-block { display: flex; width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn[aria-busy="true"] { opacity: .72; cursor: wait; pointer-events: none; }
.btn[aria-busy="true"]::after {
  content: ""; display: inline-block; width: 14px; height: 14px; margin-left: var(--s-2);
  border: 2px solid currentColor; border-top-color: transparent;
  border-radius: 50%; animation: spin .6s linear infinite; vertical-align: -.15em;
}

/* ── Hero ────────────────────────────────────────────────────────── */
.hero {
  display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: var(--s-8);
  max-width: var(--maxw); margin-inline: auto; padding: var(--s-8) var(--s-6) var(--s-7);
}
.hero-content h1 { font-size: clamp(2.3rem, 5.4vw, 3.6rem); font-weight: 800; margin: var(--s-5) 0 var(--s-4); }
.highlight { color: var(--signal-h); }
.hero-content > p { color: var(--muted); font-size: 1.12rem; max-width: 46ch; margin-bottom: var(--s-6); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-4); }
.hero-stats { display: flex; gap: var(--s-7); margin-top: var(--s-7); }
.hero-stat strong { display: block; font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; color: var(--text); }
.hero-stat span { color: var(--faint); font-size: .85rem; }

/* Terminal preview (NOC console motif) */
.terminal-preview {
  background: linear-gradient(180deg, var(--bg-elev), var(--bg));
  border: 1px solid var(--border); border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg); overflow: hidden;
  font-family: var(--font-mono); font-size: .85rem;
  position: relative;
}
.terminal-preview::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(34,197,94,.08);
}
.terminal-bar {
  display: flex; align-items: center; gap: 7px;
  padding: var(--s-3) var(--s-4);
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f57; } .dot.yellow { background: #febc2e; } .dot.green { background: #28c840; }
.terminal-title { margin-left: auto; color: var(--faint); font-size: .8rem; }
.terminal-body { padding: var(--s-5); line-height: 1.85; color: var(--text); overflow-x: auto; }
.terminal-body p { white-space: pre; }
.terminal-body .out { color: var(--muted); }
/* Console lines are slotted (light DOM) into the png-terminal shadow */
.terminal-body ::slotted(p) { white-space: pre; margin: 0; }
.terminal-body ::slotted(.out) { color: var(--muted); }
.prompt { color: var(--signal-h); font-weight: 700; }
.ok { color: var(--success-h); }
.cursor { animation: blink 1.1s step-end infinite; color: var(--signal-h); }
@keyframes blink { 50% { opacity: 0; } }

/* ── Signal band (operations metrics row) ────────────────────────── */
.signal-band {
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-elev), transparent);
}
.signal-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-5);
  max-width: var(--maxw); margin-inline: auto; padding: var(--s-6);
}
.signal-stat { display: flex; align-items: center; gap: var(--s-4); }
.signal-stat .ico { color: var(--signal); }
.signal-stat .sig-icon {
  display: grid; place-items: center; width: 44px; height: 44px; flex: none;
  border-radius: var(--r-md); background: var(--signal-soft); border: 1px solid rgba(34,197,94,.22); color: var(--signal-h);
}
.sig-val { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; line-height: 1.1; font-variant-numeric: tabular-nums; }
.sig-label { color: var(--faint); font-size: .82rem; }

/* ── Features (4-up) ─────────────────────────────────────────────── */
.features { background: transparent; }
.features-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-5);
  max-width: var(--maxw); margin-inline: auto; padding: var(--s-8) var(--s-6);
}
.feature-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-5); transition: border-color .2s, transform .2s, box-shadow .2s;
}
.feature-card:hover { border-color: var(--border-h); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.feature-icon {
  display: inline-grid; place-items: center; width: 48px; height: 48px;
  margin-bottom: var(--s-4); border-radius: var(--r-md);
  background: var(--gradient-soft); border: 1px solid rgba(34,197,94,.24); color: var(--signal-h);
}
.feature-card h3 { font-size: 1.06rem; margin-bottom: var(--s-2); }
.feature-card p { color: var(--muted); font-size: .9rem; }

/* ── Home section heading (intro above a features grid) ──────────── */
.home-section-head { text-align: center; max-width: 640px; margin: var(--s-8) auto 0; padding-inline: var(--s-6); }
.home-section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); font-weight: 800; margin: var(--s-3) 0; }
.home-section-head p { color: var(--muted); font-size: 1.02rem; }

/* ── CTA band ────────────────────────────────────────────────────── */
.cta-band { padding: var(--s-8) var(--s-6); }
.cta-inner {
  position: relative; overflow: hidden;
  max-width: var(--maxw); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--s-5);
  padding: var(--s-7); border: 1px solid var(--border); border-radius: var(--r-xl);
  background: linear-gradient(135deg, rgba(34,197,94,.10), rgba(56,189,248,.08)), var(--surface);
}
.cta-inner::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(32rem 22rem at 108% -40%, rgba(34,197,94,.2), transparent 60%);
  pointer-events: none;
}
.cta-text { position: relative; z-index: 1; }
.cta-text h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: var(--s-2); }
.cta-text p { color: var(--muted); }
.cta-band .hero-actions { position: relative; z-index: 1; }

/* ── Auth (split-screen) ─────────────────────────────────────────── */
.auth-split {
  display: grid; grid-template-columns: 1fr 1fr;
  max-width: 980px; margin: var(--s-8) auto; padding-inline: var(--s-6);
  gap: var(--s-7); align-items: center;
}
.auth-brand {
  align-self: stretch;
  display: flex; flex-direction: column; justify-content: center; gap: var(--s-5);
  padding: var(--s-7);
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--bg-elev), var(--surface));
  position: relative; overflow: hidden;
}
.auth-brand::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(24rem 18rem at 0% 0%, rgba(34,197,94,.16), transparent 60%);
}
.auth-brand > * { position: relative; z-index: 1; }
.auth-brand h2 { font-size: 1.6rem; }
.auth-brand p { color: var(--muted); }
.auth-brand .terminal-preview { font-size: .8rem; }
.auth-card {
  position: relative;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); box-shadow: var(--shadow-md);
  padding: var(--s-7); width: 100%; max-width: 440px; justify-self: center;
}
.auth-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--gradient); border-radius: var(--r-lg) var(--r-lg) 0 0;
}
.auth-card h2 { font-size: 1.5rem; margin-bottom: var(--s-2); }
.auth-card .auth-sub { color: var(--muted); font-size: .92rem; margin-bottom: var(--s-6); }
.danger-zone { border-color: rgba(244,63,94,.4); }
.danger-zone::before { background: var(--danger); }
.danger-zone h2 { color: var(--danger-h); }
.form-group { margin-bottom: var(--s-4); }
.form-group label { display: block; margin-bottom: var(--s-2); color: var(--text); font-size: .88rem; font-weight: 500; }
.form-group input,
.form-group select {
  width: 100%; padding: .72rem .85rem; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--r-md);
  color: var(--text); font-family: var(--font-body); font-size: .95rem;
  transition: border-color .15s, box-shadow .15s;
}
.form-group input::placeholder { color: var(--faint); }
.form-group input:focus,
.form-group select:focus { outline: none; border-color: var(--signal); box-shadow: 0 0 0 3px rgba(34,197,94,.16); }
.field-optional { color: var(--faint); font-weight: 400; font-size: .8rem; }
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 2.8rem; }
.pw-toggle {
  position: absolute; right: .6rem; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--faint); cursor: pointer; padding: var(--s-1);
  display: grid; place-items: center; transition: color .15s; border-radius: var(--r-sm);
}
.pw-toggle:hover { color: var(--text); }
.pw-toggle:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
.auth-link-row { display: flex; justify-content: space-between; align-items: center; margin-top: var(--s-2); }
.auth-link-row a { font-size: .83rem; color: var(--muted); }
.auth-link-row a:hover { color: var(--signal-h); }
.auth-card .btn-block { margin-top: var(--s-5); }
.auth-link { margin-top: var(--s-5); text-align: center; color: var(--muted); font-size: .9rem; }
.alert { padding: .7rem 1rem; border-radius: var(--r-md); margin-bottom: var(--s-5); font-size: .9rem; }
.alert-error   { background: rgba(244,63,94,.12); border: 1px solid rgba(244,63,94,.4); color: var(--danger-h); }
.alert-success { background: var(--signal-soft); border: 1px solid var(--signal-dim); color: var(--signal); }

/* ── Social sign-in ──────────────────────────────────────────────── */
.oauth-divider { display: flex; align-items: center; gap: var(--s-3); margin: var(--s-5) 0; color: var(--muted); font-size: .8rem; }
.oauth-divider::before, .oauth-divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.oauth-buttons { display: flex; flex-direction: column; gap: var(--s-3); }
.btn-oauth { background: var(--surface-2); border-color: var(--border-h); color: var(--text); gap: var(--s-3); justify-content: center; }
.btn-oauth:hover { background: var(--surface); }
.btn-oauth svg { flex: none; }
.btn-oauth-google:hover { border-color: #4285F4; }
.btn-oauth-facebook:hover { border-color: #1877F2; }
.linked-accounts { list-style: none; display: flex; flex-direction: column; gap: var(--s-3); }
.linked-accounts li { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.linked-accounts .la-name { font-weight: 600; }

/* ── Page header ─────────────────────────────────────────────────── */
.page-header { text-align: center; max-width: 680px; margin-inline: auto; padding: var(--s-8) var(--s-4) var(--s-6); }
.page-header h1 { font-size: clamp(1.95rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: var(--s-3); }
.page-header p { color: var(--muted); font-size: 1.05rem; }

/* ── Courses grid ────────────────────────────────────────────────── */
.course-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--s-5);
  max-width: var(--maxw); margin-inline: auto; padding: 0 var(--s-6) var(--s-8);
}
.course-card {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; transition: border-color .2s, transform .2s, box-shadow .2s; color: var(--text);
}
.course-card:hover { border-color: var(--signal-dim); transform: translateY(-4px); box-shadow: var(--shadow-md); color: var(--text); }

/* Topology-motif cover (no photo dependency) */
.course-cover {
  position: relative; height: 160px; overflow: hidden;
  background:
    radial-gradient(120% 140% at 80% 0%, rgba(34,197,94,.24), transparent 55%),
    linear-gradient(160deg, var(--surface-2), var(--bg-elev));
  border-bottom: 1px solid var(--border);
}
.course-cover svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.course-cover .topo-l { stroke: rgba(148,163,184,.32); stroke-width: 1; }
.course-cover .topo-n { fill: var(--signal); }
.course-cover .topo-n.alt { fill: var(--sky); }
.course-level {
  display: inline-block; padding: 3px 10px; border-radius: var(--r-full);
  font-family: var(--font-display); font-size: .72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .03em;
}
.course-cover .course-level { position: absolute; top: var(--s-3); right: var(--s-3); z-index: 2; backdrop-filter: blur(4px); }
.level-beginner     { background: rgba(34,197,94,.92);  color: #04140d; }
.level-intermediate { background: rgba(245,181,19,.92);  color: #1a1304; }
.level-advanced     { background: rgba(244,63,94,.92);   color: #1a0606; }
.level-expert       { background: rgba(129,140,248,.92); color: #0a0a1a; }
.course-info { padding: var(--s-5); display: flex; flex-direction: column; flex: 1; }
.course-info h3 { font-size: 1.15rem; margin-bottom: var(--s-2); }
.course-info p {
  color: var(--muted); font-size: .92rem; margin-bottom: var(--s-4);
  display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.course-meta { margin-top: auto; display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2); }
.lab-count {
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--signal-h); font-family: var(--font-display); font-size: .85rem; font-weight: 600;
}
/* Coming-soon */
.course-card.soon { opacity: .72; }
.course-card.soon .course-cover { filter: grayscale(.4); }
.badge-soon {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 2px 10px; border-radius: var(--r-full);
  background: var(--surface-2); border: 1px solid var(--border-h);
  color: var(--muted); font-family: var(--font-display); font-size: .74rem; font-weight: 600;
}
.empty-state {
  grid-column: 1/-1; text-align: center; color: var(--muted);
  padding: var(--s-8); border: 1px dashed var(--border); border-radius: var(--r-lg);
  display: flex; flex-direction: column; align-items: center; gap: var(--s-4);
}
.empty-state-icon {
  display: grid; place-items: center; width: 56px; height: 56px;
  border-radius: var(--r-lg); background: var(--gradient-soft);
  border: 1px solid rgba(34,197,94,.18); color: var(--signal-h);
}

/* ── Course detail ───────────────────────────────────────────────── */
.course-detail-header { max-width: 860px; margin: var(--s-8) auto var(--s-6); padding-inline: var(--s-6); }
.back-link { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--muted); font-size: .9rem; margin-bottom: var(--s-4); }
.back-link:hover { color: var(--signal-h); }
.course-detail-header h1 { font-size: clamp(1.7rem, 4vw, 2.3rem); margin: var(--s-3) 0; }
.course-detail-header > p { color: var(--muted); font-size: 1.05rem; margin-bottom: var(--s-5); }
/* Stats strip */
.course-stats {
  display: flex; flex-wrap: wrap; gap: var(--s-3);
  max-width: 860px; margin: 0 auto var(--s-6); padding-inline: var(--s-6);
}
.stat {
  flex: 1; min-width: 150px;
  display: flex; align-items: center; gap: var(--s-3);
  padding: var(--s-4); border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface);
}
.stat-icon {
  display: grid; place-items: center; width: 38px; height: 38px; flex-shrink: 0;
  border-radius: var(--r-sm); background: var(--gradient-soft); color: var(--signal-h);
}
.stat-val { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; line-height: 1.1; }
.stat-label { color: var(--faint); font-size: .8rem; }

.lab-list { max-width: 860px; margin: 0 auto var(--s-8); padding-inline: var(--s-6); }
.lab-list h2 { font-size: 1.4rem; margin-bottom: var(--s-5); }
.lab-item {
  display: flex; align-items: flex-start; gap: var(--s-5);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-5); margin-bottom: var(--s-4); transition: border-color .2s;
}
.lab-item:hover { border-color: var(--border-h); }
.lab-number {
  width: 40px; height: 40px; background: var(--gradient); color: var(--signal-ink);
  border-radius: var(--r-md); display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; flex-shrink: 0;
}
.lab-info { flex: 1; min-width: 0; }
.lab-info h3 { font-size: 1.1rem; margin-bottom: var(--s-1); }
.lab-info > p { color: var(--muted); font-size: .92rem; }
.lab-meta { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-3); }
.lab-tag {
  display: inline-flex; align-items: center; gap: var(--s-1);
  padding: 2px 9px; border-radius: var(--r-full);
  background: var(--bg-elev); border: 1px solid var(--border);
  color: var(--muted); font-size: .78rem; font-family: var(--font-mono);
}
.lab-objectives { color: var(--faint); font-size: .85rem; margin-top: var(--s-3); padding-left: var(--s-5); }
.lab-objectives li { margin-bottom: var(--s-1); }
.lab-item .btn { flex-shrink: 0; }

/* ── Lab workspace layout ────────────────────────────────────────── */
.lab-layout { display: flex; height: calc(100dvh - var(--nav-h)); overflow: hidden; }
.lab-sidebar {
  width: 350px; flex-shrink: 0; background: var(--bg-elev);
  border-right: 1px solid var(--border); display: flex; flex-direction: column; overflow-y: auto;
}
.lab-sidebar-header { padding: var(--s-5); border-bottom: 1px solid var(--border); }
.lab-sidebar-header h2 { display: flex; align-items: center; gap: var(--s-3); font-size: 1.15rem; margin: var(--s-3) 0 var(--s-2); }
.lab-sidebar-header h2 .ico { color: var(--signal-h); flex: none; }
.lab-sidebar-header p { color: var(--muted); font-size: .9rem; }
.sidebar-section { padding: var(--s-5); border-bottom: 1px solid var(--border); }
.sidebar-section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s-4); }
.sidebar-section h3 {
  font-family: var(--font-display); font-size: .78rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--faint);
}

/* Progress ring (objectives) */
.progress-ring { position: relative; display: inline-grid; flex-shrink: 0; }
.progress-ring svg { display: block; transform: rotate(-90deg); }
.progress-ring .track { fill: none; stroke: var(--border); stroke-width: 4; }
.progress-ring .fill {
  fill: none; stroke: var(--signal); stroke-width: 4; stroke-linecap: round;
  stroke-dasharray: 113; stroke-dashoffset: 113;
  transition: stroke-dashoffset .6s cubic-bezier(.4,0,.2,1);
}
.progress-ring .label {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-display); font-size: .68rem; font-weight: 700; color: var(--text);
}

.objective-list { list-style: none; }
.objective-list li { display: flex; gap: var(--s-3); padding: var(--s-2) 0; font-size: .92rem; color: var(--muted); }
.objective-check { color: var(--faint); flex-shrink: 0; transition: color .2s, transform .2s; }
.objective-list li.done { color: var(--text); }
.objective-list li.done .objective-check { color: var(--success-h); transform: scale(1.1); }

.hint-item { border-top: 1px solid var(--border); }
.hint-item:first-child { border-top: none; }
.hint-cost-note { color: var(--faint); font-size: .78rem; margin-bottom: var(--s-2); }
.hint-unlock {
  display: flex; align-items: center; gap: var(--s-2); width: 100%; text-align: left;
  background: none; border: none; cursor: pointer;
  color: var(--signal-h); font-family: var(--font-body); font-size: .9rem; font-weight: 500; padding: var(--s-3) 0;
}
.hint-unlock .ico { color: var(--faint); transition: transform .2s; }
.hint-item.unlocked .hint-unlock { color: var(--muted); cursor: default; }
.hint-item.unlocked .hint-unlock .ico { color: var(--signal); }
.hint-item .hint-text { color: var(--muted); font-size: .88rem; padding: 0 0 var(--s-3) var(--s-5); }

/* "ตอนนี้มีคนทำ Lab อยู่" live counter under the catalog header */
.live-labs-row { display: flex; justify-content: center; margin: 0 0 var(--s-6); }

/* Lab mode chips (troubleshoot / boss) in the sidebar header */
.lab-mode-chip {
  display: inline-flex; align-items: center; gap: var(--s-1);
  margin: 0 var(--s-2) var(--s-2) 0; padding: .2rem .55rem; border-radius: 999px;
  font-size: .74rem; font-weight: 600;
  background: rgba(245,181,19,.1); border: 1px solid rgba(245,181,19,.35); color: var(--warning-h);
}
.lab-mode-chip.boss { background: rgba(244,63,94,.1); border-color: rgba(244,63,94,.35); color: var(--danger-h); }

/* Lab scenario — styled as a helpdesk ticket above the objectives */
.lab-ticket {
  background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--faint);
  border-radius: var(--r-sm); padding: var(--s-3) var(--s-4);
}
.lab-ticket.prio-medium { border-left-color: var(--warning); }
.lab-ticket.prio-high { border-left-color: var(--danger); }
.ticket-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s-2); }
.ticket-tag {
  display: inline-flex; align-items: center; gap: var(--s-1);
  font-family: var(--font-display); font-size: .72rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--faint);
}
.ticket-prio { font-size: .75rem; font-weight: 600; color: var(--muted); }
.lab-ticket.prio-medium .ticket-prio { color: var(--warning-h); }
.lab-ticket.prio-high .ticket-prio { color: var(--danger-h); }
.ticket-from { font-size: .8rem; color: var(--faint); margin-bottom: var(--s-2); }
.ticket-body { color: var(--muted); font-size: .88rem; line-height: 1.55; }

/* Sandbox (no grading checks) note in the controls area */
.sandbox-note {
  display: flex; align-items: center; gap: var(--s-2);
  padding: var(--s-3); border: 1px dashed var(--border-h); border-radius: var(--r-sm);
  color: var(--muted); font-size: .85rem;
}
.sandbox-note .ico { color: var(--signal-h); flex-shrink: 0; }

.lab-controls { padding: var(--s-5); margin-top: auto; display: grid; gap: var(--s-3); position: sticky; bottom: 0; background: var(--bg-elev); border-top: 1px solid var(--border); }
.lab-controls .btn:disabled { position: relative; }
.lab-controls .btn:disabled[title]:hover::after {
  content: attr(title); position: absolute; bottom: calc(100% + var(--s-2)); left: 50%;
  transform: translateX(-50%); background: var(--surface-2); border: 1px solid var(--border-h);
  color: var(--muted); font-size: .78rem; white-space: nowrap;
  padding: var(--s-1) var(--s-3); border-radius: var(--r-sm); pointer-events: none;
  font-weight: 400; letter-spacing: 0;
}

.lab-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }
.lab-toolbar {
  display: flex; align-items: center; gap: var(--s-4);
  padding: var(--s-2) var(--s-5); background: var(--surface);
  border-bottom: 1px solid var(--border); min-height: 48px;
}
.lab-sidebar-toggle {
  display: none; align-items: center; gap: var(--s-2);
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--r-md); padding: var(--s-2) var(--s-3); cursor: pointer; font-size: .9rem;
}
.lab-status { margin-left: auto; display: inline-flex; align-items: center; gap: var(--s-2); font-size: .88rem; font-weight: 500; }
.lab-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; box-shadow: 0 0 8px 1px currentColor; }
.status-loading { color: var(--warning-h); }
.status-loading::before { animation: blink 1s step-end infinite; }
.status-ready { color: var(--success-h); }
.status-error { color: var(--danger); }
.status-stopped { color: var(--faint); }

.gns3-wrapper { flex: 1; overflow: hidden; position: relative; }
.gns3-frame { display: block; width: 100%; height: 100%; border: none; background: var(--bg); }

/* Multi-step provisioning loader */
.lab-loading { position: absolute; inset: 0; display: grid; place-items: center; background: var(--bg); }
.lab-loading[hidden] { display: none; }
.provision {
  width: min(420px, 88vw);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); box-shadow: var(--shadow-lg); padding: var(--s-6);
}
.provision-title { font-family: var(--font-display); font-weight: 700; margin-bottom: var(--s-1); }
.provision-sub { color: var(--muted); font-size: .88rem; margin-bottom: var(--s-5); font-family: var(--font-mono); }
.provision-steps { list-style: none; display: grid; gap: var(--s-3); }
.provision-step { display: flex; align-items: center; gap: var(--s-3); color: var(--faint); font-size: .92rem; transition: color .2s; }
.provision-step .ps-icon {
  width: 24px; height: 24px; flex-shrink: 0; border-radius: 50%;
  border: 2px solid var(--border); display: grid; place-items: center;
  font-size: .72rem; transition: all .25s;
}
.provision-step.active { color: var(--text); }
.provision-step.active .ps-icon { border-color: var(--signal); border-top-color: transparent; animation: spin .8s linear infinite; }
.provision-step.done { color: var(--text); }
.provision-step.done .ps-icon { border-color: var(--success-h); background: var(--success-h); color: var(--signal-ink); animation: none; }
.provision-step.error .ps-icon { border-color: var(--danger); background: var(--danger); color: #1a0606; animation: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.provision.failed .provision-sub { color: var(--danger-h); }
.provision.done-all { text-align: center; }

/* Stopped state */
.lab-stopped { text-align: center; color: var(--muted); display: grid; gap: var(--s-3); justify-items: center; }
.lab-stopped .ico { color: var(--faint); }

/* ── Grading modal ───────────────────────────────────────────────── */
.grade-modal-overlay {
  position: fixed; inset: 0; background: rgba(4,8,15,.78); backdrop-filter: blur(6px);
  z-index: 500; display: flex; align-items: center; justify-content: center; padding: var(--s-4);
  animation: fade .2s ease;
}
@keyframes fade { from { opacity: 0; } }
.grade-modal-overlay[hidden] { display: none; }
.grade-modal {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg); width: 100%; max-width: 560px; max-height: 86vh;
  display: flex; flex-direction: column; overflow: hidden;
  animation: modal-in .22s cubic-bezier(.34,1.3,.64,1);
}
@keyframes modal-in { from { transform: scale(.95) translateY(8px); opacity: 0; } }
.grade-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--s-4) var(--s-5); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.grade-modal-header h3 { font-size: 1.1rem; }
.grade-modal-close { background: none; border: none; color: var(--muted); line-height: 1; cursor: pointer; padding: var(--s-1); transition: color .15s; display: grid; place-items: center; }
.grade-modal-close:hover { color: var(--text); }

/* Score hero: ring + banner */
.grade-score-hero {
  display: flex; align-items: center; gap: var(--s-5);
  padding: var(--s-5); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.score-ring { position: relative; width: 96px; height: 96px; flex-shrink: 0; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring .track { fill: none; stroke: var(--border); stroke-width: 8; }
.score-ring .fill {
  fill: none; stroke-width: 8; stroke-linecap: round;
  stroke-dasharray: 264; stroke-dashoffset: 264;
  transition: stroke-dashoffset .9s cubic-bezier(.4,0,.2,1);
}
.score-ring.pass .fill { stroke: var(--success-h); }
.score-ring.fail .fill { stroke: var(--danger); }
.score-ring .center { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.score-ring .pct { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; line-height: 1; }
.score-ring .center small { display: block; color: var(--faint); font-size: .66rem; margin-top: 2px; }
.grade-score-meta { flex: 1; }
.grade-banner { display: flex; align-items: center; gap: var(--s-2); font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; margin-bottom: var(--s-1); }
.grade-banner.pass { color: var(--success-h); }
.grade-banner.fail { color: var(--danger); }
.grade-score-meta p { color: var(--muted); font-size: .9rem; }

.grade-result-list { list-style: none; overflow-y: auto; flex: 1; padding: var(--s-2) 0; }
.grade-result-item { padding: var(--s-3) var(--s-5); border-bottom: 1px solid var(--border); font-size: .92rem; }
.grade-result-item:last-child { border-bottom: none; }
.grade-result-row { display: flex; align-items: center; gap: var(--s-3); }
.grade-icon {
  display: grid; place-items: center; width: 22px; height: 22px; flex-shrink: 0;
  border-radius: 50%; font-size: .8rem; font-weight: 700;
}
.grade-icon.pass { background: rgba(34,197,94,.16); color: var(--success-h); }
.grade-icon.fail { background: rgba(244,63,94,.16); color: var(--danger); }
.grade-desc { flex: 1; }
.grade-pts { color: var(--faint); font-size: .82rem; white-space: nowrap; font-family: var(--font-mono); }
.grade-toggle { color: var(--faint); font-size: .8rem; cursor: pointer; user-select: none; }
.grade-result-item.has-output .grade-result-row { cursor: pointer; }
.grade-output {
  margin-top: var(--s-2); padding: var(--s-3);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm);
  font-family: var(--font-mono); font-size: .78rem; color: var(--muted);
  white-space: pre-wrap; word-break: break-all; max-height: 100px; overflow-y: auto; display: none;
}
.grade-result-item.expanded .grade-output { display: block; }
.grade-result-item.expanded .grade-toggle { color: var(--signal-h); }
.grade-fail-hint {
  display: flex; gap: var(--s-2); align-items: flex-start;
  margin: var(--s-2) 0 0 calc(22px + var(--s-3)); padding: var(--s-2) var(--s-3);
  background: rgba(245,181,19,.08); border: 1px solid rgba(245,181,19,.25); border-radius: var(--r-sm);
  color: var(--warning-h); font-size: .85rem;
}
.grade-fail-hint .ico { flex-shrink: 0; margin-top: 2px; }
.grade-gamify { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-3); }
.gamify-chip {
  display: inline-flex; align-items: center; gap: var(--s-1);
  padding: .25rem .6rem; border-radius: 999px; font-size: .8rem; font-weight: 600;
  background: var(--surface-2); border: 1px solid var(--border-h); color: var(--muted);
}
.gamify-chip.xp { background: var(--signal-soft); border-color: var(--signal-dim); color: var(--signal-h); }
.gamify-chip.level { background: rgba(245,181,19,.12); border-color: rgba(245,181,19,.4); color: var(--warning-h); }
.gamify-chip.streak { background: rgba(244,63,94,.1); border-color: rgba(244,63,94,.3); color: var(--danger-h); }

/* AI mentor box in the grade modal */
.mentor-box { padding: var(--s-4) var(--s-5); border-top: 1px solid var(--border); }
.mentor-reply {
  margin-top: var(--s-3); padding: var(--s-3) var(--s-4);
  background: var(--signal-soft); border: 1px solid var(--signal-dim); border-radius: var(--r-md);
  color: var(--text); font-size: .9rem; line-height: 1.6; white-space: pre-wrap;
}

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
  padding: var(--s-6); color: var(--faint); font-size: .85rem;
  border-top: 1px solid var(--border); background: var(--bg-elev);
}
.footer-inner {
  max-width: var(--maxw); margin-inline: auto;
  display: flex; align-items: center; gap: var(--s-4); flex-wrap: wrap;
}
.footer-brand { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--text); font-family: var(--font-display); font-weight: 700; }
.footer-brand .ico { color: var(--signal); }
.footer-copy { margin-left: auto; }
.footer-disclaimer {
  max-width: var(--maxw); margin: var(--s-4) auto 0;
  font-size: .75rem; opacity: .75;
}
.lab-layout ~ footer { display: none; }

/* ════════════════════════════════════════════════════════════════════
   Learn + Lab: lanes, modules, lessons, reading, quiz
   ════════════════════════════════════════════════════════════════════ */

/* ── Catalog level lanes ─────────────────────────────────────── */
.level-lane { max-width: var(--maxw); margin: 0 auto var(--s-7); padding-inline: var(--s-4); }
.lane-head { display: flex; align-items: center; gap: var(--s-3); margin-bottom: var(--s-4); padding-bottom: var(--s-3); border-bottom: 1px solid var(--border); }
.lane-count { color: var(--faint); font-size: .85rem; }

.course-track { font-size: .72rem; font-weight: 600; letter-spacing: .02em; color: var(--sky); text-transform: uppercase; }
.course-cover .course-track { position: absolute; top: var(--s-3); left: var(--s-3); z-index: 2; background: rgba(4,8,15,.55); padding: 2px 8px; border-radius: var(--r-full); backdrop-filter: blur(4px); }
.course-track.inline { display: inline-block; margin-right: var(--s-3); }
.course-pct-badge { position: absolute; bottom: var(--s-3); right: var(--s-3); z-index: 2; background: var(--gradient); color: var(--signal-ink); font-size: .72rem; font-weight: 700; padding: 2px 9px; border-radius: var(--r-full); }

.meta-chip { display: inline-flex; align-items: center; gap: var(--s-1); font-size: .78rem; color: var(--muted); background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r-full); padding: 2px 9px; }
.meta-chip .ico { color: var(--faint); }
.card-progress { margin-top: var(--s-3); height: 5px; background: var(--surface-2); border-radius: var(--r-full); overflow: hidden; }
.card-progress span { display: block; height: 100%; background: var(--gradient); border-radius: var(--r-full); transition: width .5s; }

/* ── Course detail: prereqs + progress bar ───────────────────── */
.prereq-box { margin-top: var(--s-4); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: var(--s-4); font-size: .9rem; }
.prereq-box ul { margin: var(--s-2) 0 0 var(--s-5); color: var(--muted); }
.prereq-box li { padding: 2px 0; }

.course-progress-bar { max-width: var(--maxw); margin: 0 auto var(--s-6); padding: var(--s-4) var(--s-5); display: flex; align-items: center; gap: var(--s-5); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); }
.progress-ring.lg .label { font-size: .95rem; }
.cpb-meta { flex: 1; }
.cpb-meta strong { font-family: var(--font-display); }
.cpb-meta p { color: var(--muted); font-size: .9rem; margin-top: 2px; }

/* ── Module accordion ────────────────────────────────────────── */
.module-list { max-width: var(--maxw); margin: 0 auto var(--s-8); padding-inline: var(--s-4); display: flex; flex-direction: column; gap: var(--s-3); }
.module-block { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.module-block[open] { border-color: var(--border-h); }
.module-summary { display: flex; align-items: center; gap: var(--s-4); padding: var(--s-4) var(--s-5); cursor: pointer; list-style: none; transition: background .15s; border-radius: var(--r-lg) var(--r-lg) 0 0; }
.module-block:not([open]) .module-summary { border-radius: var(--r-lg); }
.module-summary:hover { background: var(--surface-2); }
.module-summary::-webkit-details-marker { display: none; }
.module-index { width: 34px; height: 34px; flex-shrink: 0; display: grid; place-items: center; border-radius: var(--r-full); background: var(--gradient-soft); border: 1px solid rgba(34,197,94,.24); color: var(--signal-h); font-family: var(--font-display); font-weight: 700; }
.module-titles { flex: 1; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.module-titles small { color: var(--muted); font-size: .85rem; }
.module-progress { display: flex; align-items: center; gap: var(--s-3); flex-shrink: 0; }
.mp-count { font-size: .82rem; color: var(--faint); font-variant-numeric: tabular-nums; }
.mp-bar { width: 90px; height: 6px; background: var(--surface-2); border-radius: var(--r-full); overflow: hidden; }
.mp-bar span { display: block; height: 100%; background: var(--gradient); transition: width .5s; }

.module-objectives { padding: 0 var(--s-5) var(--s-4); font-size: .88rem; color: var(--muted); }
.module-objectives strong { color: var(--text); }
.module-objectives ul { margin: var(--s-2) 0 0 var(--s-5); }
.module-objectives li { padding: 2px 0; }

/* ── Lesson rows ─────────────────────────────────────────────── */
.lesson-rows { list-style: none; border-top: 1px solid var(--border); }
.lesson-row a { display: flex; align-items: center; gap: var(--s-3); padding: var(--s-3) var(--s-5); border-bottom: 1px solid var(--border); color: var(--text); transition: background .15s; }
.lesson-row a:hover { background: var(--surface-2); }
.lesson-row:last-child a { border-bottom: none; }
.lesson-check { width: 22px; height: 22px; flex-shrink: 0; display: grid; place-items: center; border-radius: var(--r-full); border: 1px solid var(--border-h); color: var(--faint); }
.lesson-row.done .lesson-check { background: var(--signal); border-color: var(--signal); color: var(--signal-ink); }
.lesson-type-chip { flex-shrink: 0; display: inline-flex; align-items: center; gap: var(--s-1); font-size: .74rem; padding: 2px 8px; border-radius: var(--r-full); border: 1px solid var(--border); white-space: nowrap; }
.lesson-type-chip.type-reading { color: var(--sky); }
.lesson-type-chip.type-lab { color: var(--signal-h); }
.lesson-type-chip.type-quiz { color: var(--warning-h); }
.lesson-title { flex: 1; font-size: .94rem; min-width: 0; }
.lesson-meta { display: flex; gap: var(--s-2); flex-shrink: 0; }
.lesson-tag { display: inline-flex; align-items: center; gap: var(--s-1); font-size: .74rem; color: var(--faint); }

/* ── Reading + quiz layout ───────────────────────────────────── */
.learn-layout { max-width: 820px; margin: 0 auto; padding: var(--s-6) var(--s-4) var(--s-8); }
.reading-head { margin-bottom: var(--s-6); padding-bottom: var(--s-5); border-bottom: 1px solid var(--border); }
.reading-crumb { color: var(--sky); font-size: .82rem; font-weight: 600; margin-bottom: var(--s-2); }
.reading-head h1 { display: flex; align-items: center; gap: var(--s-3); font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.reading-head h1 .ico { color: var(--signal-h); flex: none; }
/* light-DOM <png-icon> host in headings: color inherits into its shadow svg */
.reading-head h1 png-icon { color: var(--signal-h); }
.reading-time { display: inline-flex; align-items: center; gap: var(--s-2); margin-top: var(--s-3); color: var(--faint); font-size: .85rem; }
.reading-section { margin-bottom: var(--s-6); }
.reading-section > h2 { font-size: 1.3rem; margin-bottom: var(--s-3); padding-left: var(--s-3); border-left: 3px solid var(--signal); }
.reading-figure { margin: var(--s-4) 0; text-align: center; }
.reading-figure img { max-width: 100%; border-radius: var(--r-md); border: 1px solid var(--border); }

/* Markdown prose */
.prose { color: var(--text); line-height: 1.8; font-size: 1.02rem; max-width: 70ch; }
.prose p { margin: 0 0 var(--s-4); }
.prose h2, .prose h3 { font-family: var(--font-display); margin: var(--s-5) 0 var(--s-3); }
.prose h3 { font-size: 1.1rem; }
.prose ul, .prose ol { margin: 0 0 var(--s-4) var(--s-5); }
.prose li { margin: var(--s-2) 0; }
.prose strong { color: #fff; }
.prose code { font-family: var(--font-mono); font-size: .9em; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r-sm); padding: 1px 6px; color: var(--signal-h); }
.prose pre { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--r-md); padding: var(--s-4); overflow-x: auto; margin: 0 0 var(--s-4); }
.prose pre code { background: none; border: none; padding: 0; color: var(--text); }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 var(--s-4); font-size: .92rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: var(--s-2) var(--s-3); text-align: left; }
.prose th { background: var(--surface-2); }
.prose blockquote { border-left: 3px solid var(--sky); padding-left: var(--s-4); color: var(--muted); margin: 0 0 var(--s-4); }
.prose a { color: var(--signal-h); text-decoration: underline; }
.prose-inline p { display: inline; margin: 0; }

/* Lesson footer nav */
.lesson-footer { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); margin-top: var(--s-7); padding-top: var(--s-5); border-top: 1px solid var(--border); }
.lesson-nav { flex: 1; }
.lesson-nav.right { text-align: right; }
.btn.is-done { background: var(--surface-2); color: var(--success-h); box-shadow: none; }

/* ── Quiz ────────────────────────────────────────────────────── */
.quiz-q { border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-5); margin-bottom: var(--s-4); background: var(--surface); }
.quiz-q.q-pass { border-color: var(--success); }
.quiz-q.q-fail { border-color: var(--danger); }
.quiz-q legend { display: flex; gap: var(--s-3); align-items: baseline; font-weight: 600; font-size: 1.02rem; padding: 0 var(--s-2); }
.qnum { display: inline-grid; place-items: center; min-width: 26px; height: 26px; border-radius: var(--r-full); background: var(--gradient-soft); border: 1px solid rgba(34,197,94,.24); color: var(--signal-h); font-family: var(--font-display); font-size: .85rem; }
.quiz-hint { display: inline-flex; align-items: center; gap: var(--s-1); color: var(--warning-h); font-size: .8rem; margin: var(--s-2) 0 0 38px; }
.quiz-choices { margin-top: var(--s-3); display: flex; flex-direction: column; gap: var(--s-2); }
.quiz-choice { position: relative; display: flex; align-items: center; gap: var(--s-3); padding: var(--s-3) var(--s-4); border: 1px solid var(--border); border-radius: var(--r-md); cursor: pointer; transition: border-color .15s, background .15s; }
.quiz-choice:hover { border-color: var(--border-h); background: var(--surface-2); }
.quiz-choice:has(input:focus-visible) { border-color: var(--signal); box-shadow: 0 0 0 3px rgba(34,197,94,.16); }
.quiz-choice input { position: absolute; opacity: 0; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.choice-mark { width: 20px; height: 20px; flex-shrink: 0; border: 2px solid var(--border-h); border-radius: var(--r-full); display: grid; place-items: center; transition: all .15s; }
.quiz-choice input:checked ~ .choice-mark { border-color: var(--signal); background: var(--signal); box-shadow: inset 0 0 0 3px var(--surface); }
.quiz-choice.correct { border-color: var(--success); background: rgba(34,197,94,.08); }
.quiz-choice.wrong { border-color: var(--danger); background: rgba(244,63,94,.08); }
.quiz-choice.missed { border-color: var(--success); border-style: dashed; }
.quiz-explain { display: flex; gap: var(--s-2); margin-top: var(--s-3); padding: var(--s-3) var(--s-4); background: var(--surface-2); border-radius: var(--r-md); font-size: .88rem; color: var(--muted); }
.quiz-explain .ico { color: var(--warning-h); flex: none; }

.quiz-result { display: flex; align-items: center; gap: var(--s-5); margin-top: var(--s-5); padding: var(--s-5); background: var(--surface); border: 1px solid var(--border-h); border-radius: var(--r-lg); }
.quiz-result-meta p { color: var(--muted); font-size: .9rem; margin-top: var(--s-1); }

/* ════════════════════════════════════════════════════════════════════
   Responsive
   ════════════════════════════════════════════════════════════════════ */
@media (max-width: 1000px) {
  .features-inner { grid-template-columns: repeat(2, 1fr); }
  .signal-inner { grid-template-columns: repeat(2, 1fr); gap: var(--s-6); }
}
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: var(--s-6); padding-block: var(--s-7); }
  .hero-visual { order: -1; }
  .auth-split { grid-template-columns: 1fr; max-width: 480px; }
  .auth-brand { display: none; }
}
@media (max-width: 640px) {
  :root { --nav-h: 56px; }
  .navbar { padding-inline: var(--s-4); }
  .nav-links { gap: var(--s-3); }
  .nav-user { display: none; }
  .features-inner { grid-template-columns: 1fr; }
  .signal-inner { grid-template-columns: 1fr; gap: var(--s-4); }
  .container, .hero, .features-inner, .course-grid, .cta-band,
  .course-detail-header, .course-stats, .lab-list, .signal-inner { padding-inline: var(--s-4); }
  .hero-stats { gap: var(--s-5); }
  .hero-actions .btn { flex: 1; }
  .cta-inner { padding: var(--s-5); }
  .lab-item { flex-wrap: wrap; }
  .lab-item .btn { width: 100%; }
  .footer-copy { margin-left: 0; flex-basis: 100%; }

  /* Lab sidebar → slide-in drawer */
  .lab-sidebar-toggle { display: inline-flex; }
  .lab-sidebar {
    position: fixed; top: var(--nav-h); bottom: 0; left: 0;
    width: min(86vw, 350px); z-index: 200;
    transform: translateX(-100%); transition: transform .25s ease; box-shadow: var(--shadow-lg);
  }
  .lab-sidebar.open { transform: translateX(0); }
  .lab-scrim { position: fixed; inset: var(--nav-h) 0 0 0; background: rgba(4,8,15,.6); z-index: 150; }
  .lab-scrim[hidden] { display: none; }
  .grade-score-hero { flex-direction: column; text-align: center; }
  .grade-banner { justify-content: center; }
}

@media (max-width: 480px) {
  .course-progress-bar { flex-wrap: wrap; }
  .module-summary { flex-wrap: wrap; }
  .mp-bar { width: 60px; }
}

/* ── Dashboard ──────────────────────────────────────────────────────── */
.dash { max-width: 880px; margin-inline: auto; padding: var(--s-7) var(--s-4) var(--s-8); }
.dash-head h1 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); margin-bottom: var(--s-1); }
.dash-head p { color: var(--muted); }
.dash-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--s-3); margin: var(--s-6) 0 var(--s-7);
}
.dash-stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-4); text-align: center;
}
.dash-stat strong { display: block; font-family: var(--font-display); font-size: 1.55rem; font-weight: 700; }
.dash-stat span { color: var(--muted); font-size: .82rem; }
/* Gamification row: ตำแหน่ง (level) / streak / badges */
.dash-gamify {
  display: grid; gap: var(--s-3); margin: 0 0 var(--s-5);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr);
  grid-template-areas: "level level" "streak badges";
}
.dash-level  { grid-area: level; }
.dash-streak { grid-area: streak; }
.dash-badges { grid-area: badges; }
@media (max-width: 760px) {
  .dash-gamify { grid-template-columns: 1fr; grid-template-areas: "level" "streak" "badges"; }
}
.dash-gamify-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-4);
}
.dash-gamify-label {
  font-family: var(--font-display); font-size: .72rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--faint); margin-bottom: var(--s-2);
}

/* ── Career banner: current rank + locked next-rank preview ── */
.dash-level {
  display: flex; align-items: center; gap: var(--s-4);
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--signal) 9%, transparent), transparent 55%),
    radial-gradient(120% 140% at 100% 100%, color-mix(in srgb, var(--core) 11%, transparent), transparent 55%),
    var(--surface);
}
.dash-rank { display: flex; flex-direction: column; align-items: center; gap: 6px; flex: 0 0 auto; }
.dash-rank-cap {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .05em;
  font-weight: 600; color: var(--faint); text-align: center; max-width: 130px;
}
.dash-rank.next .dash-rank-cap { color: var(--muted); }
.dash-rank-echo-wrap { position: relative; display: inline-flex; }
/* locked next rank — visible but dimmed so the learner sees what's coming */
.dash-rank.locked png-mascot {
  filter: grayscale(.9) brightness(.5); opacity: .5;
  transition: filter .35s ease, opacity .35s ease;
}
.dash-rank.locked:hover png-mascot,
.dash-rank.locked:focus-within png-mascot { filter: grayscale(.2) brightness(.92); opacity: .95; }
.dash-rank-lock {
  position: absolute; right: -2px; bottom: 12px;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--border-h); color: var(--muted);
  display: grid; place-items: center;
}
.dash-level-info { min-width: 0; flex: 1; }
.dash-level-name { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; color: var(--signal-h); }
.dash-level-tease {
  display: inline-flex; align-items: center; gap: 5px; margin-top: var(--s-2);
  font-size: .76rem; color: var(--core-h);
  background: color-mix(in srgb, var(--core) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--core) 35%, transparent);
  border-radius: var(--r-sm); padding: 4px 9px;
}
@media (max-width: 760px) { .dash-level { flex-direction: column; text-align: center; } }
.dash-level-bar {
  height: 7px; background: var(--bg); border-radius: 999px; overflow: hidden;
  margin: var(--s-3) 0 var(--s-2); border: 1px solid var(--border);
}
.dash-level-bar span {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--signal), var(--core-h));
}
.dash-gamify-sub { color: var(--muted); font-size: .82rem; }
.dash-gamify-sub strong { color: var(--text); font-weight: 600; }
.dash-gamify-sub .num { font-variant-numeric: tabular-nums; color: var(--signal-h); }
.dash-gamify-xp { color: var(--faint); font-size: .78rem; margin-top: var(--s-2); font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.dash-streak { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 2px; }
.dash-streak-fire { font-size: 1.7rem; line-height: 1; }
.dash-streak strong { font-family: var(--font-display); font-size: 1.25rem; }
.badge-grid { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.badge-item {
  display: inline-flex; flex-direction: column; align-items: center; gap: 2px;
  width: 64px; padding: var(--s-2) 2px; border-radius: var(--r-md);
  background: var(--bg); border: 1px solid var(--border); cursor: default;
}
.badge-item .badge-icon { font-size: 1.15rem; line-height: 1; }
.badge-item small { font-size: .6rem; color: var(--muted); text-align: center; line-height: 1.2; }

/* ── Level-up celebration overlay (levelup.js) ───────────────────── */
.levelup-overlay {
  position: fixed; inset: 0; z-index: 1000;
  display: grid; place-items: center; padding: var(--s-4);
  background: rgba(4, 8, 15, .72);
  opacity: 0; transition: opacity .2s ease;
}
.levelup-overlay.show { opacity: 1; }
.levelup-card {
  position: relative; overflow: hidden; width: min(92vw, 420px); text-align: center;
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--core) 16%, transparent), transparent 60%),
    var(--surface);
  border: 1px solid var(--border-h); border-radius: var(--r-xl);
  padding: var(--s-6) var(--s-5) var(--s-5);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5);
  transform: scale(.9) translateY(8px); opacity: 0;
  transition: transform .26s cubic-bezier(.2, .9, .3, 1.2), opacity .26s ease;
}
.levelup-overlay.show .levelup-card { transform: scale(1) translateY(0); opacity: 1; }
.levelup-eyebrow {
  font-family: var(--font-display); font-weight: 700; letter-spacing: .04em;
  color: var(--core-h); font-size: .9rem; margin-bottom: var(--s-2);
}
.levelup-echo { display: grid; place-items: center; margin: var(--s-2) 0; }
.levelup-rank-label { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--faint); }
.levelup-rank { font-family: var(--font-display); font-size: 1.7rem; font-weight: 700; color: var(--signal-h); margin: 2px 0 var(--s-3); }
.levelup-gear { font-size: .85rem; color: var(--muted); margin-bottom: var(--s-4); }
.levelup-gear strong { color: var(--text); }
.levelup-close { min-width: 160px; }
.levelup-confetti { position: absolute; inset: 0 0 auto 0; height: 0; pointer-events: none; }
.levelup-confetti i {
  position: absolute; top: -12px; width: 8px; height: 12px; border-radius: 2px;
  opacity: 0; animation: levelup-fall 1.5s ease-in forwards;
}
@keyframes levelup-fall {
  0% { transform: translateY(-10px) rotate(0); opacity: 1; }
  100% { transform: translateY(440px) rotate(540deg); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .levelup-overlay, .levelup-card { transition: none; }
  .levelup-card { transform: none; opacity: 1; }
}
.badge-item.locked { opacity: .35; filter: grayscale(1); }
.badge-item.earned { border-color: var(--signal-dim); }

.dash-section-title {
  display: flex; align-items: center; gap: var(--s-2);
  font-size: 1.12rem; margin: var(--s-7) 0 var(--s-4); color: var(--text);
}

/* Quick-note widget inside the lab sidebar */
.lab-note-input {
  width: 100%; padding: var(--s-2) var(--s-3); margin-bottom: var(--s-2);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm);
  color: var(--text); font-family: var(--font-body); font-size: .85rem; resize: vertical;
}
.lab-note-input:focus { outline: none; border-color: var(--signal); }
.lab-note-msg { display: block; margin-top: var(--s-2); font-size: .78rem; color: var(--signal-h); min-height: 1em; }

/* Notes page */
.notes-wrap { max-width: 820px; margin-inline: auto; padding: 0 var(--s-4) var(--s-8); }
.note-search-row { margin-bottom: var(--s-4); }
.note-new { margin-bottom: var(--s-6); border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--surface); }
.note-new > summary {
  cursor: pointer; padding: var(--s-3) var(--s-4); font-weight: 600; list-style: none;
  display: flex; align-items: center; gap: var(--s-2); color: var(--signal-h);
}
.note-new > summary::-webkit-details-marker { display: none; }
.note-new .note-editor { padding: 0 var(--s-4) var(--s-4); }
.note-editor { display: flex; flex-direction: column; gap: var(--s-3); }
.note-title-input, .note-body-input {
  width: 100%; padding: var(--s-3); background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--r-md);
  color: var(--text); font-family: var(--font-body); font-size: .95rem;
}
.note-body-input { resize: vertical; line-height: 1.6; }
.note-title-input { font-weight: 600; }
.note-editor-actions { display: flex; justify-content: flex-end; gap: var(--s-3); }
.note-group { margin-bottom: var(--s-6); }
.note-group-title {
  font-family: var(--font-display); font-size: .9rem; color: var(--faint);
  text-transform: uppercase; letter-spacing: .05em; margin-bottom: var(--s-3);
  padding-bottom: var(--s-2); border-bottom: 1px solid var(--border);
}
.note-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--s-3); }
.note-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: var(--s-4); }
.note-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s-2); }
.note-card-head h3 { font-size: 1rem; margin: 0; }
.note-card-actions { display: flex; gap: var(--s-1); flex-shrink: 0; }
.note-action {
  display: grid; place-items: center; width: 26px; height: 26px; border-radius: var(--r-sm);
  background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); cursor: pointer;
}
.note-action:hover { border-color: var(--border-h); color: var(--text); }
.note-action.danger:hover { color: var(--danger-h); border-color: var(--danger); }
.note-source { font-size: .78rem; color: var(--faint); margin: var(--s-1) 0; }
.note-source a { color: var(--signal-h); }
.note-body { color: var(--muted); font-size: .88rem; margin: var(--s-2) 0; max-height: 220px; overflow-y: auto; }
.note-time { display: block; font-size: .72rem; color: var(--faint); margin-top: var(--s-2); }

/* Public profile / portfolio */
.profile-wrap { max-width: 720px; margin-inline: auto; padding: var(--s-7) var(--s-4) var(--s-8); }
.profile-hero { text-align: center; margin-bottom: var(--s-6); }
.profile-avatar {
  width: 80px; height: 80px; margin: 0 auto var(--s-3); border-radius: 50%;
  display: grid; place-items: center; font-family: var(--font-display); font-size: 2rem; font-weight: 700;
  background: var(--gradient); color: var(--signal-ink);
}
.profile-hero h1 { font-size: 1.8rem; margin-bottom: var(--s-1); }
.profile-title { font-family: var(--font-display); font-size: 1.1rem; color: var(--signal-h); font-weight: 600; }
.profile-since { color: var(--faint); font-size: .82rem; margin-top: var(--s-2); }
.profile-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: var(--s-3); margin-bottom: var(--s-6); }
.profile-stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-4); text-align: center; }
.profile-stat strong { display: block; font-family: var(--font-display); font-size: 1.5rem; }
.profile-stat span { color: var(--muted); font-size: .78rem; }
.profile-section { margin-bottom: var(--s-6); }
.profile-section h2 { font-size: 1.1rem; margin-bottom: var(--s-4); }
.profile-courses { list-style: none; display: flex; flex-direction: column; gap: var(--s-2); }
.profile-courses li { display: flex; align-items: center; gap: var(--s-2); padding: var(--s-3) var(--s-4); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); }
.profile-courses .ico { color: var(--success-h); }
.profile-courses .course-level { margin-left: auto; }
.profile-courses a { color: var(--text); text-decoration: none; }
.profile-courses a:hover { text-decoration: underline; }
.profile-cert-serial { font-family: var(--font-mono); font-size: .72rem; color: var(--muted); }
.profile-empty { color: var(--muted); text-align: center; padding: var(--s-5); }
.profile-cta { text-align: center; padding: var(--s-6); border-top: 1px solid var(--border); margin-top: var(--s-6); }
.profile-cta p { color: var(--muted); margin-bottom: var(--s-4); }

/* Spaced-repetition review prompt on the dashboard */
.dash-review-card {
  display: flex; align-items: center; gap: var(--s-3);
  background: var(--surface); border: 1px solid var(--signal-dim); border-radius: var(--r-lg);
  padding: var(--s-4) var(--s-5); margin-bottom: var(--s-4); color: var(--text); text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.dash-review-card:hover { border-color: var(--signal); transform: translateY(-1px); }
.dash-review-icon { font-size: 1.5rem; line-height: 1; }
.dash-review-text { flex: 1; font-size: .9rem; color: var(--muted); }
.dash-review-text strong { display: block; color: var(--text); font-size: 1rem; }
.dash-review-card .ico { color: var(--signal-h); flex-shrink: 0; }

/* Review page (spaced repetition) */
.review-page .review-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--s-2); margin-bottom: var(--s-4); font-size: .82rem; color: var(--faint); }
.review-empty { text-align: center; padding: var(--s-7) var(--s-4); }
.review-empty-icon { font-size: 2.5rem; margin-bottom: var(--s-3); }
.review-empty h2 { margin-bottom: var(--s-2); }
.review-empty p { color: var(--muted); margin-bottom: var(--s-5); }
.review-form .quiz-q { margin-bottom: var(--s-4); }
.review-verdict { display: flex; align-items: center; gap: var(--s-2); font-weight: 600; margin-bottom: var(--s-4); }
.review-result.pass .review-verdict { color: var(--success-h); }
.review-result.fail .review-verdict { color: var(--danger-h); }
.quiz-choice.is-correct { border-color: var(--success); background: rgba(34,197,94,.08); }
.quiz-choice.is-correct .ico { color: var(--success-h); margin-left: auto; }
.quiz-choice.is-wrong { border-color: var(--danger); background: rgba(244,63,94,.08); }
.quiz-q.reviewed .quiz-choice { cursor: default; }

/* ── Exam Simulator ──────────────────────────────────────────────── */
.exam-wrap { max-width: 760px; margin-inline: auto; padding: 0 var(--s-4) var(--s-8); }
.exam-resume-card, .exam-card {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-4) var(--s-5);
}
.exam-resume-card { border-color: var(--signal-dim); margin-bottom: var(--s-5); }
.exam-resume-card p { color: var(--muted); font-size: .88rem; }
.exam-rules { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-5); margin-bottom: var(--s-5); }
.exam-rules h2 { font-size: 1.05rem; margin-bottom: var(--s-3); }
.exam-rules ul { list-style: none; display: flex; flex-direction: column; gap: var(--s-2); }
.exam-rules li { color: var(--muted); font-size: .9rem; }
.exam-list { display: flex; flex-direction: column; gap: var(--s-3); }
.exam-card-body h3 { font-size: 1.1rem; margin-bottom: var(--s-1); }
.exam-card-body p { color: var(--muted); font-size: .88rem; margin-bottom: var(--s-2); }
.exam-card-meta { display: flex; gap: var(--s-4); font-size: .82rem; color: var(--faint); }
.exam-card-meta span { display: inline-flex; align-items: center; gap: var(--s-1); }

/* Events hub (/events) */
.events-wrap { max-width: 760px; margin-inline: auto; padding: 0 var(--s-4) var(--s-8); }
.events-list { display: flex; flex-direction: column; gap: var(--s-3); }
.event-card {
  display: flex; align-items: center; gap: var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-4) var(--s-5);
}
.event-card-soon { opacity: .72; }
.event-card-icon { font-size: 2rem; line-height: 1; flex-shrink: 0; }
.event-card-body { flex: 1; min-width: 0; }
.event-card-head { display: flex; align-items: center; gap: var(--s-2); margin-bottom: var(--s-1); }
.event-card-head h3 { font-size: 1.1rem; }
.event-card-body p { color: var(--muted); font-size: .88rem; }
.event-tag { font-size: .7rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.event-tag.live { color: var(--signal); background: var(--signal-soft); }
.event-tag.soon { color: var(--faint); border: 1px solid var(--border); }
.events-empty { text-align: center; padding: var(--s-7) var(--s-4); }
.events-empty-icon { font-size: 2.5rem; margin-bottom: var(--s-3); }
.events-empty h2 { margin-bottom: var(--s-2); }
.events-empty p { color: var(--muted); margin-bottom: var(--s-5); }

/* Exam runner (png-exam) */
.exam-layout { display: flex; flex-direction: column; height: 100%; }
.exam-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--s-2) var(--s-5); background: var(--surface); border-bottom: 1px solid var(--border); min-height: 52px;
}
.exam-progress { display: flex; align-items: center; gap: var(--s-3); }
.exam-count { font-family: var(--font-display); font-weight: 700; }
.exam-dots { display: inline-flex; gap: var(--s-1); }
.exam-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border-h); }
.exam-dot.done { background: var(--signal); }
.exam-dot.current { background: var(--warning-h); box-shadow: 0 0 0 3px rgba(245,181,19,.2); }
.exam-timer {
  font-family: var(--font-mono); font-size: 1.4rem; font-weight: 700; color: var(--text);
  padding: var(--s-1) var(--s-3); border-radius: var(--r-sm); background: var(--bg); border: 1px solid var(--border);
}
.exam-timer.urgent { color: var(--danger-h); border-color: var(--danger); animation: examPulse 1s infinite; }
@keyframes examPulse { 50% { background: rgba(244,63,94,.12); } }
.exam-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.exam-lab-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); padding: var(--s-2) var(--s-5); background: var(--surface-2); border-bottom: 1px solid var(--border); }
.exam-lab-title { display: inline-flex; align-items: center; gap: var(--s-2); font-weight: 600; }
.exam-lab-title .ico { color: var(--signal-h); }
.exam-status { font-size: .82rem; color: var(--faint); }
.exam-controls { display: flex; gap: var(--s-3); justify-content: flex-end; padding: var(--s-3) var(--s-5); background: var(--bg-elev); border-top: 1px solid var(--border); }
.exam-controls .btn-primary { min-width: 200px; }
.exam-result .shared-meta { font-size: .92rem; }

/* ── Lab Duel ────────────────────────────────────────────────────── */
.duel-wrap { max-width: 680px; margin-inline: auto; padding: 0 var(--s-4) var(--s-8); }
.duel-resume-card, .duel-cta-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-5); margin-bottom: var(--s-5);
}
.duel-resume-card { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); border-color: var(--signal-dim); }
.duel-resume-card p { color: var(--muted); font-size: .88rem; }
.duel-cta-card { text-align: center; }
.duel-cta-card h2 { margin-bottom: var(--s-2); }
.duel-cta-card p { color: var(--muted); margin-bottom: var(--s-4); }
.duel-rules { list-style: none; display: flex; flex-direction: column; gap: var(--s-2); color: var(--muted); font-size: .88rem; }
.duel-rules li::before { content: '⚔️ '; }
.duel-closed { text-align: center; padding: var(--s-7) var(--s-4); }
.duel-closed-icon, .duel-vs-emoji { font-size: 2.5rem; margin-bottom: var(--s-3); }
.duel-closed h2 { margin-bottom: var(--s-2); }
.duel-closed p { color: var(--muted); margin-bottom: var(--s-5); }
.duel-join-card { padding: var(--s-7) var(--s-5); }
.duel-join-note { font-size: .85rem; }
.duel-invite { max-width: 520px; margin: var(--s-5) auto; text-align: center; }
.duel-invite-row { display: flex; gap: var(--s-2); margin: var(--s-2) 0; }
.duel-invite-input { flex: 1; padding: var(--s-2) var(--s-3); background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm); color: var(--text); font-family: var(--font-mono); font-size: .82rem; }
.duel-waiting { color: var(--warning-h); font-size: .9rem; }

/* Duel room */
.duel-layout { display: flex; flex-direction: column; height: calc(100dvh - var(--nav-h)); }
.duel-board { display: flex; align-items: center; justify-content: center; gap: var(--s-5); padding: var(--s-4); background: var(--surface); border-bottom: 1px solid var(--border); }
.duel-side { display: flex; flex-direction: column; align-items: center; gap: 2px; min-width: 130px; }
.duel-name { font-size: .82rem; color: var(--muted); }
.duel-pct { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; }
.duel-side.you .duel-pct { color: var(--signal-h); }
.duel-side.foe .duel-pct { color: var(--danger-h); }
.duel-vs { font-family: var(--font-display); font-weight: 700; color: var(--faint); }
.duel-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.duel-lab-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); padding: var(--s-2) var(--s-5); background: var(--surface-2); border-bottom: 1px solid var(--border); }
.duel-lab-title { display: inline-flex; align-items: center; gap: var(--s-2); font-weight: 600; }
.duel-lab-title .ico { color: var(--signal-h); }
.duel-status { font-size: .82rem; color: var(--faint); }
.duel-controls { display: flex; gap: var(--s-3); justify-content: flex-end; padding: var(--s-3) var(--s-5); background: var(--bg-elev); border-top: 1px solid var(--border); }
.duel-controls .btn-primary { min-width: 180px; }
.duel-result-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: center; z-index: 50; }
.duel-result-overlay[hidden] { display: none; } /* author display:grid ทับ UA [hidden] — ต้องประกาศ none เอง ไม่งั้น overlay โผล่ทุกสถานะ */
.duel-result-card { background: var(--surface); border: 1px solid var(--border-h); border-radius: var(--r-lg); padding: var(--s-7); text-align: center; max-width: 360px; }
.duel-result-emoji { font-size: 3rem; margin-bottom: var(--s-3); }
.duel-result-card h2 { margin-bottom: var(--s-5); }

/* ── Leaderboard ─────────────────────────────────────────────────── */
.lb-wrap { max-width: 620px; margin-inline: auto; padding: 0 var(--s-4) var(--s-8); }
.lb-me-card {
  display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap;
  background: var(--surface); border: 1px solid var(--signal-dim); border-radius: var(--r-lg);
  padding: var(--s-4) var(--s-5); margin-bottom: var(--s-5); color: var(--muted); font-size: .9rem;
}
.lb-me-card strong { font-family: var(--font-display); font-size: 1.5rem; color: var(--signal-h); }
.lb-me-card.empty { border-color: var(--border); justify-content: space-between; }
.lb-list { list-style: none; display: flex; flex-direction: column; gap: var(--s-2); }
.lb-row {
  display: flex; align-items: center; gap: var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--s-3) var(--s-4);
}
.lb-row.top { border-color: var(--border-h); }
.lb-row.me { border-color: var(--signal); background: var(--signal-soft); }
.lb-rank { width: 2.2rem; text-align: center; font-family: var(--font-display); font-weight: 700; color: var(--faint); }
.lb-name { flex: 1; font-weight: 500; }
.lb-name small { color: var(--faint); font-weight: 400; }
.lb-xp { font-family: var(--font-mono); font-size: .88rem; color: var(--signal-h); }
.lb-note { color: var(--faint); font-size: .8rem; margin-top: var(--s-5); text-align: center; }
.lb-note a { color: var(--muted); }
.toggle-row {
  display: flex; align-items: flex-start; gap: var(--s-3);
  color: var(--muted); font-size: .9rem; margin-bottom: var(--s-4); cursor: pointer;
}
.toggle-row input { width: auto; margin-top: 3px; accent-color: var(--signal); }
.dash-courses { display: flex; flex-direction: column; gap: var(--s-3); }
.dash-course {
  display: flex; align-items: center; gap: var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--s-4) var(--s-5); transition: border-color .2s;
}
.dash-course:hover { border-color: var(--border-h); }
.dash-course-info { flex: 1; min-width: 0; }
.dash-course-title { font-family: var(--font-display); font-weight: 600; color: var(--text); }
.dash-course-title:hover { color: var(--signal-h); }
.dash-course-info p { color: var(--muted); font-size: .85rem; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dash-done-badge {
  display: inline-flex; align-items: center; gap: var(--s-1); flex-shrink: 0;
  color: var(--signal-h); font-size: .85rem; font-weight: 600;
}
.dash-activity { list-style: none; display: flex; flex-direction: column; gap: var(--s-2); }
.dash-activity li {
  display: flex; align-items: center; gap: var(--s-3);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--s-3) var(--s-4); font-size: .9rem;
}
.dash-activity-title { flex: 1; min-width: 0; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dash-activity-title:hover { color: var(--signal-h); }
.dash-activity-meta { flex-shrink: 0; color: var(--muted); font-size: .8rem; display: inline-flex; align-items: center; gap: var(--s-2); }
.dash-score { color: var(--signal-h); font-weight: 600; }
@media (max-width: 560px) {
  .dash-course { flex-wrap: wrap; }
  .dash-activity-meta .dash-date { display: none; }
}

/* ── Catalog search ────────────────────────────────────────────────── */
.catalog-search-wrap { max-width: var(--maxw); margin: 0 auto var(--s-5); padding-inline: var(--s-4); }
.catalog-search {
  display: block; width: 100%; padding: var(--s-3) var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  color: var(--text); font-size: .95rem; font-family: var(--font-body);
  outline: none; transition: border-color .15s; box-sizing: border-box;
}
.catalog-search::placeholder { color: var(--faint); }
.catalog-search:focus { border-color: var(--signal); }

/* ── Show-more button ──────────────────────────────────────────────── */
.show-more-btn {
  display: block; margin: var(--s-3) auto 0; padding: var(--s-2) var(--s-5);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  color: var(--muted); font-size: .88rem; font-family: var(--font-body); cursor: pointer;
  transition: border-color .15s, color .15s;
}
.show-more-btn:hover { border-color: var(--border-h); color: var(--text); }

/* ── Certificate page ──────────────────────────────────────────────── */
.cert-wrap {
  max-width: 860px; margin: 0 auto; padding: var(--s-5) var(--s-4);
  display: flex; flex-direction: column; align-items: center; gap: var(--s-5);
}
.cert-back { align-self: flex-start; }
.cert-page {
  width: 100%; background: #fff; border-radius: var(--r-lg);
  box-shadow: 0 4px 40px rgba(0,0,0,.4); color: #1a2030;
}
.cert-border {
  margin: 12px; border: 2px solid #22c55e; border-radius: calc(var(--r-lg) - 4px);
  padding: var(--s-6) var(--s-7);
}
.cert-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--s-3); }

.cert-brand  { display: flex; align-items: center; gap: var(--s-3); }
.cert-brand-name {
  font-family: var(--font-display); font-size: 1.4rem; font-weight: 800;
  letter-spacing: .12em; color: #22c55e;
}
.cert-dot { width: 6px; height: 6px; border-radius: 50%; background: #22c55e; }
.cert-brand-sub { margin: 0; font-size: .75rem; color: #5b6b85; letter-spacing: .1em; text-transform: uppercase; }

.cert-divider { width: 120px; height: 1px; background: linear-gradient(90deg, transparent, #22c55e, transparent); }
.cert-divider--sm { width: 80px; }

.cert-heading { font-size: 1.7rem; font-weight: 700; color: #1a2030; margin: 0; line-height: 1.2; }
.cert-sub     { margin: 0; font-size: .85rem; color: #5b6b85; letter-spacing: .08em; }
.cert-given   { margin: 0; font-size: .9rem; color: #5b6b85; }
.cert-name    {
  font-family: var(--font-display); font-size: 2.2rem; font-weight: 700; color: #0f1923;
  padding: var(--s-1) var(--s-5); border-bottom: 2px solid #22c55e; line-height: 1.3;
}
.cert-body { margin: 0; font-size: .95rem; color: #374151; }
.cert-lesson-count { font-weight: 600; color: #22c55e; }
.cert-course-box {
  background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: var(--r-md);
  padding: var(--s-3) var(--s-5); max-width: 540px;
}
.cert-track { font-size: .72rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: #16a34a; }
.cert-course-title { font-size: 1.15rem; font-weight: 700; color: #0f1923; margin-top: 2px; }
.cert-course-desc  { font-size: .82rem; color: #6b7280; margin-top: 2px; }

.cert-footer-row { display: flex; align-items: center; justify-content: center; gap: var(--s-6); width: 100%; }
.cert-date-block { display: flex; flex-direction: column; gap: 2px; }
.cert-date-label { font-size: .75rem; color: #5b6b85; }
.cert-date { font-size: 1rem; font-weight: 600; color: #0f1923; }

.cert-actions { display: flex; gap: var(--s-3); flex-wrap: wrap; justify-content: center; }

.cert-serial-row {
  display: flex; flex-direction: column; align-items: center; gap: 2px; margin-top: var(--s-2);
}
.cert-serial     { font-size: .8rem; color: #374151; font-family: var(--font-mono); }
.cert-serial strong { color: #16a34a; letter-spacing: .04em; }
.cert-verify-url { font-size: .72rem; color: #6b7280; word-break: break-all; }

/* Inline display-name editor (hidden on print) */
.cert-edit {
  width: 100%; max-width: 540px; display: flex; flex-direction: column; gap: var(--s-2);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--s-3) var(--s-4);
}
.cert-edit label   { font-size: .85rem; font-weight: 600; color: var(--text); }
.cert-edit-row     { display: flex; gap: var(--s-2); flex-wrap: wrap; }
.cert-edit-row input {
  flex: 1; min-width: 180px; padding: var(--s-2) var(--s-3);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm);
  color: var(--text); font-size: .95rem;
}
.cert-edit-hint { margin: 0; font-size: .75rem; color: var(--muted); }

/* ── Public certificate verification (/cert/:serial) ───────────────── */
.cert-verify-wrap { max-width: 640px; margin: 0 auto; padding: var(--s-6) var(--s-4); }
.cert-verify-card {
  background: var(--surface); border: 1px solid var(--signal-dim); border-radius: var(--r-lg);
  padding: var(--s-6); display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: var(--s-3);
}
.cert-verify-check {
  width: 64px; height: 64px; border-radius: 50%; background: var(--signal-soft);
  display: flex; align-items: center; justify-content: center; color: var(--signal);
}
.cert-verify-status { font-size: 1.3rem; font-weight: 700; color: var(--signal); margin: 0; }
.cert-verify-name   { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; color: var(--text); margin: var(--s-2) 0 0; }
.cert-verify-course { font-size: 1.05rem; font-weight: 600; color: var(--text); margin: 0; }
.cert-verify-meta   { display: flex; flex-direction: column; gap: var(--s-1); margin-top: var(--s-3); width: 100%; }
.cert-verify-meta dl { display: grid; grid-template-columns: auto 1fr; gap: var(--s-1) var(--s-4); margin: 0; text-align: left; }
.cert-verify-meta dt { font-size: .82rem; color: var(--muted); }
.cert-verify-meta dd { font-size: .9rem; color: var(--text); margin: 0; font-family: var(--font-mono); }

/* Dashboard certificate link */
.dash-done-wrap  { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; }
.dash-cert-link  {
  font-size: .8rem; color: var(--signal); text-decoration: none;
  display: inline-flex; align-items: center; gap: 4px;
  border: 1px solid var(--signal-dim); border-radius: var(--r-sm);
  padding: 2px 8px; transition: background .15s;
}
.dash-cert-link:hover { background: var(--signal-soft); }

/* ── Lab attempt history (sidebar) ─────────────────────────────────── */
.lab-history { display: flex; flex-direction: column; gap: 4px; margin-top: var(--s-2); }
.hist-item {
  display: grid; grid-template-columns: 44px 1fr auto auto; align-items: center; gap: var(--s-2);
  padding: 5px var(--s-2); border-radius: var(--r-sm);
  border-left: 3px solid var(--border);
}
.hist-item.pass { border-left-color: var(--signal); background: var(--signal-soft); }
.hist-item.fail { border-left-color: rgba(239,68,68,.5); background: rgba(239,68,68,.06); }
.hist-pct  { font-size: .85rem; font-weight: 700; font-family: var(--font-mono); }
.hist-item.pass .hist-pct { color: var(--signal); }
.hist-item.fail .hist-pct { color: #f87171; }
.hist-detail { font-size: .75rem; color: var(--muted); }
.hist-badge  { display: flex; align-items: center; }
.hist-item.pass .hist-badge { color: var(--signal); }
.hist-item.fail .hist-badge { color: #f87171; }

/* ── Prerequisite gate ──────────────────────────────────────────────── */
.prereq-gate {
  margin-top: var(--s-4); padding: var(--s-4) var(--s-5);
  background: rgba(251,191,36,.07); border: 1px solid rgba(251,191,36,.25);
  border-radius: var(--r-md); display: flex; flex-direction: column; gap: var(--s-2);
}
.prereq-gate strong { color: #fbbf24; display: flex; align-items: center; gap: var(--s-2); font-size: .95rem; }
.prereq-gate > p    { margin: 0; font-size: .88rem; color: var(--muted); }
.prereq-items { display: flex; flex-direction: column; gap: var(--s-2); margin-top: var(--s-1); }
.prereq-item {
  display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto 4px;
  gap: 2px var(--s-3); padding: var(--s-2) var(--s-3);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-sm);
  text-decoration: none; color: inherit; transition: border-color .15s;
}
.prereq-item:hover { border-color: var(--border-h); }
.prereq-item.prereq-done { border-color: var(--signal-dim); }
.prereq-title { font-size: .88rem; font-weight: 500; grid-column: 1; grid-row: 1; }
.prereq-pct   { font-size: .8rem; color: var(--muted); grid-column: 2; grid-row: 1; text-align: right; }
.prereq-req   { color: var(--faint); }
.prereq-bar   { grid-column: 1 / -1; grid-row: 2; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.prereq-fill  { height: 100%; background: var(--signal); border-radius: 999px; transition: width .3s; }
.prereq-item.prereq-done .prereq-pct { color: var(--signal); }

/* ── Admin panel ────────────────────────────────────────────────────── */
.admin-wrap { max-width: var(--maxw); margin: 0 auto; padding: var(--s-6) var(--s-4); }
.admin-title { font-size: 1.6rem; font-weight: 700; margin-bottom: var(--s-5); }
.admin-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--s-3); margin-bottom: var(--s-6);
}
.admin-stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--s-4); display: flex; flex-direction: column; gap: var(--s-1);
}
.admin-stat strong { font-size: 1.7rem; font-weight: 700; color: var(--signal); }
.admin-stat span   { font-size: .8rem; color: var(--muted); }
.admin-section { margin-bottom: var(--s-7); }
.admin-section h2 {
  font-size: 1.05rem; font-weight: 600; margin-bottom: var(--s-3);
  display: flex; align-items: center; gap: var(--s-2);
}
.admin-badge {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 1px 8px; font-size: .75rem; color: var(--muted);
}
.admin-table-wrap { overflow-x: auto; }
.admin-table {
  width: 100%; border-collapse: collapse; font-size: .875rem;
}
.admin-table th {
  text-align: left; padding: var(--s-2) var(--s-3);
  border-bottom: 1px solid var(--border); color: var(--muted); font-weight: 500;
  white-space: nowrap;
}
.admin-table td {
  padding: var(--s-2) var(--s-3); border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--surface); }
.admin-empty { color: var(--muted); font-size: .9rem; padding: var(--s-3) 0; }
.mono { font-family: var(--font-mono); font-size: .8rem; color: var(--muted); }
.muted { color: var(--muted); }
.idle-warn { color: var(--amber, #f59e0b); font-weight: 600; }
.status-chip {
  display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .75rem; font-weight: 500;
}
.status-chip.status-ready    { background: var(--signal-soft); color: var(--signal); }
.status-chip.status-building { background: rgba(251,191,36,.12); color: #fbbf24; }
.role-chip {
  display: inline-block; padding: 1px 7px; border-radius: 999px; font-size: .75rem; font-weight: 500;
}
.role-chip.role-admin   { background: rgba(99,102,241,.15); color: #818cf8; }
.role-chip.role-student { background: var(--surface-2); color: var(--muted); }
.admin-btn-danger {
  padding: 3px 10px; font-size: .8rem; font-family: var(--font-body);
  background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3);
  color: #f87171; border-radius: var(--r-sm); cursor: pointer;
  transition: background .15s, border-color .15s;
}
.admin-btn-danger:hover { background: rgba(239,68,68,.22); border-color: #f87171; }

/* ── Email verification banner ──────────────────────────────────────── */
.verify-banner {
  background: rgba(251,191,36,.10);
  border-bottom: 1px solid rgba(251,191,36,.25);
  color: var(--warning-h);
  display: flex; align-items: center; justify-content: center; gap: var(--s-4);
  padding: var(--s-2) var(--s-4); font-size: .88rem; flex-wrap: wrap; text-align: center;
}
.verify-banner-text { display: flex; align-items: center; gap: var(--s-2); }
.verify-banner-form { margin: 0; }
.verify-banner-btn {
  padding: 3px 12px; font-size: .8rem; font-family: var(--font-body);
  background: rgba(251,191,36,.15); border: 1px solid rgba(251,191,36,.35);
  color: var(--warning-h); border-radius: var(--r-sm); cursor: pointer;
  transition: background .15s, border-color .15s;
}
.verify-banner-btn:hover { background: rgba(251,191,36,.26); border-color: var(--warning-h); }

/* ── Lab history share button ───────────────────────────────────────── */
.hist-share {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; padding: 0; flex-shrink: 0;
  background: none; border: 1px solid var(--border); border-radius: var(--r-sm);
  color: var(--muted); cursor: pointer; transition: background .15s, color .15s, border-color .15s;
}
.hist-share:hover:not(:disabled) { background: var(--surface-2); color: var(--text); border-color: var(--border-h); }
.hist-share:disabled { opacity: .5; cursor: default; }

/* ── Dashboard export row ───────────────────────────────────────────── */
.dash-export-row { display: flex; justify-content: flex-end; margin-bottom: var(--s-4); }

/* ── Progress export/PDF page ───────────────────────────────────────── */
.export-page { max-width: 860px; margin: 0 auto; padding: var(--s-5) var(--s-4); }
.export-header {
  display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s-4);
  margin-bottom: var(--s-5); flex-wrap: wrap;
}
.export-header h1 { font-size: 1.4rem; font-weight: 700; margin: 0 0 var(--s-1); }
.export-header > div > p { margin: 0; color: var(--muted); font-size: .9rem; }
.export-actions { display: flex; gap: var(--s-2); flex-shrink: 0; flex-wrap: wrap; }
.export-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: var(--s-3); margin-bottom: var(--s-5);
}
.export-stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--s-3); display: flex; flex-direction: column; gap: 2px; text-align: center;
}
.export-stat strong { font-size: 1.4rem; font-weight: 700; color: var(--signal); }
.export-stat span   { font-size: .75rem; color: var(--muted); }
.export-page h2 { font-size: 1rem; font-weight: 600; margin: var(--s-5) 0 var(--s-3); color: var(--text); }
.export-table {
  width: 100%; border-collapse: collapse; font-size: .875rem; margin-bottom: var(--s-4);
}
.export-table th {
  text-align: left; padding: var(--s-2) var(--s-3);
  border-bottom: 1px solid var(--border); color: var(--muted); font-weight: 500; white-space: nowrap;
}
.export-table td {
  padding: var(--s-2) var(--s-3); border-bottom: 1px solid var(--border); vertical-align: middle;
}
.export-table tr:last-child td { border-bottom: none; }
.export-bar {
  display: inline-block; width: 72px; height: 4px; background: var(--surface-2);
  border-radius: 999px; overflow: hidden; vertical-align: middle; margin-right: 4px;
}
.export-bar-fill { height: 100%; background: var(--signal); border-radius: 999px; }
.export-empty { color: var(--muted); font-size: .9rem; }

/* ── Shared lab result (public page) ────────────────────────────────── */
.shared-wrap { max-width: 640px; margin: 0 auto; padding: var(--s-6) var(--s-4); }
.shared-header {
  text-align: center; padding: var(--s-6) var(--s-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  margin-bottom: var(--s-5);
}
.shared-verdict-row {
  display: flex; align-items: center; justify-content: center; gap: var(--s-2);
  margin-bottom: var(--s-2);
}
.shared-verdict { font-size: 1rem; font-weight: 600; }
.shared-verdict.pass { color: var(--signal); }
.shared-verdict.fail { color: #f87171; }
.shared-score {
  font-family: var(--font-display); font-size: 3.5rem; font-weight: 800;
  margin: var(--s-1) 0; line-height: 1;
}
.shared-score.pass { color: var(--signal); }
.shared-score.fail { color: #f87171; }
.shared-meta   { color: var(--muted); font-size: .9rem; margin: 0 0 var(--s-1); }
.shared-course { font-size: .85rem; color: var(--sky); margin: 0 0 2px; }
.shared-date   { font-size: .8rem; color: var(--faint); margin: 0; }
.shared-results { margin-bottom: var(--s-5); }
.shared-results h2 { font-size: 1rem; font-weight: 600; margin: 0 0 var(--s-3); }
.shared-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--s-2); }
.shared-item {
  display: grid; grid-template-columns: 28px 1fr auto; align-items: center; gap: var(--s-2);
  padding: var(--s-2) var(--s-3); border-radius: var(--r-sm); border-left: 3px solid transparent;
}
.shared-item.pass { background: var(--signal-soft); border-left-color: var(--signal); }
.shared-item.fail { background: rgba(239,68,68,.06); border-left-color: rgba(239,68,68,.5); }
.shared-icon { text-align: center; font-size: 1rem; }
.shared-item.pass .shared-icon { color: var(--signal); }
.shared-item.fail .shared-icon { color: #f87171; }
.shared-desc { font-size: .88rem; }
.shared-pts  { font-size: .8rem; color: var(--muted); font-family: var(--font-mono); white-space: nowrap; }
.shared-footer { text-align: center; }
.shared-footer-note { font-size: .8rem; color: var(--faint); margin: 0 0 var(--s-3); }

/* ── Error page (404/500) ───────────────────────────────────────────── */
.error-page { text-align: center; padding: var(--s-8) var(--s-4); max-width: 520px; margin-inline: auto; }
.error-code {
  font-family: var(--font-display); font-size: clamp(4rem, 12vw, 6.5rem); font-weight: 800;
  color: var(--surface-2); -webkit-text-stroke: 2px var(--border-h); line-height: 1;
}
.error-page p { color: var(--muted); margin: var(--s-4) 0 var(--s-6); }
.error-actions { display: flex; gap: var(--s-3); justify-content: center; flex-wrap: wrap; }

/* ── Account settings ────────────────────────────────────────────────── */
.settings-wrap {
  display: grid; gap: var(--s-5); justify-items: center;
  padding: 0 var(--s-4) var(--s-8); max-width: 520px; margin-inline: auto;
}
.settings-wrap .auth-card { max-width: 480px; }
.field-note { font-size: .8rem; color: var(--muted); margin-top: var(--s-2); }
.field-note.ok { color: var(--ok, #22c55e); }