/* =====================================================================
   GitHub Copilot Hackathon
   Visual system: deep-space canvas, Chakra Petch display + DM Sans body,
   frontier teal accent, five category colors, light/dark theme.
   ===================================================================== */

/* ═══════════════════════════ TOKENS ════════════════════════════════ */
:root {
  /* Canvas — deeper than GHEC, more cosmic */
  --c-900: #03050d;
  --c-850: #06090f;
  --c-800: #080c18;
  --c-700: #0d1222;
  --c-600: #131829;
  --c-line: #1e2742;
  --c-line-soft: #141b2e;

  /* Foreground */
  --c-fg: #cdd6ea;
  --c-dim: #7a8aaa;
  --c-faint: #3f4e68;

  /* Brand -- frontier signal, teal accent (star / compass needle) */
  --c-accent: #2dd4bf;
  --c-accent-dim: #1f9e90;
  --c-accent-glow: rgba(45, 212, 191, 0.16);

  /* Category accents */
  --c-core: #58a6ff;
  --c-core-glow: rgba(88, 166, 255, 0.18);
  --c-sprints: #3fb950;
  --c-sprints-glow: rgba(63, 185, 80, 0.18);
  --c-legacy: #d29922;
  --c-legacy-glow: rgba(210, 153, 34, 0.18);
  --c-automation: #a371f7;
  --c-automation-glow: rgba(163, 113, 247, 0.18);
  --c-azure: #ec6547;
  --c-azure-glow: rgba(236, 101, 71, 0.18);

  /* Difficulty */
  --c-beginner: #4ade80;
  --c-intermediate: #facc15;
  --c-advanced: #f87171;

  /* Typography */
  --font-display: 'Chakra Petch', 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, 'SF Mono', monospace;

  /* Layout */
  --maxw: 1200px;
  --r: 12px;
  --r-sm: 7px;
  --r-lg: 18px;
  --shadow: 0 28px 70px -32px rgba(0, 0, 0, 0.9);
  --shadow-card: 0 12px 32px -18px rgba(0, 0, 0, 0.75);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Light theme */
[data-theme="light"] {
  --c-900: #f2f5fd;
  --c-850: #f8faff;
  --c-800: #ffffff;
  --c-700: #eef1fa;
  --c-600: #e5e9f5;
  --c-line: #d0d8ee;
  --c-line-soft: #dce4f6;

  --c-fg: #131828;
  --c-dim: #4a5578;
  --c-faint: #8090b2;

  --c-accent: #0f766e;
  --c-accent-dim: #0d9488;
  --c-accent-glow: rgba(15, 118, 110, 0.10);

  --c-core: #0969da;
  --c-core-glow: rgba(9, 105, 218, 0.10);
  --c-sprints: #1a7f37;
  --c-sprints-glow: rgba(26, 127, 55, 0.10);
  --c-legacy: #9a6700;
  --c-legacy-glow: rgba(154, 103, 0, 0.10);
  --c-automation: #8250df;
  --c-automation-glow: rgba(130, 80, 223, 0.10);
  --c-azure: #cf222e;
  --c-azure-glow: rgba(207, 34, 46, 0.10);

  --c-beginner: #16a34a;
  --c-intermediate: #ca8a04;
  --c-advanced: #dc2626;

  --shadow: 0 24px 60px -36px rgba(20, 24, 40, 0.30);
  --shadow-card: 0 10px 28px -20px rgba(20, 24, 40, 0.22);
}

/* ═══════════════════════════ RESET ════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--c-900);
  color: var(--c-fg);
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

/* Atmospheric backdrop: faint dot-grid + radial glows */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(800px 600px at 75% -5%, var(--c-accent-glow), transparent 65%),
    radial-gradient(600px 500px at 5% 50%, var(--c-ghaw-glow), transparent 70%),
    radial-gradient(500px 400px at 90% 90%, var(--c-ghec-glow), transparent 70%),
    radial-gradient(40px 40px at center, transparent 39px, var(--c-line-soft) 39px, var(--c-line-soft) 40px, transparent 40px) 0 0 / 44px 44px;
  opacity: 0.6;
  mask-image: linear-gradient(180deg, #000 0%, transparent 80%);
}

/* Subtle grain texture */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ═══════════════════════════ TYPE SCALE ════════════════════════════ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0;
}
h1 { font-size: clamp(2.2rem, 5vw + 0.5rem, 4.2rem); }
h2 { font-size: clamp(1.6rem, 3vw + 0.4rem, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2vw + 0.3rem, 1.5rem); }
h4 { font-size: 1rem; font-weight: 600; letter-spacing: 0; }

.mono { font-family: var(--font-mono); }

/* Eyebrow: "coordinate label" style -- mono + accent dash */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.70rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-dim);
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 1px;
  flex-shrink: 0;
}

/* ═══════════════════════════ LAYOUT ════════════════════════════════ */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }

@media (min-width: 768px) {
  .wrap { padding: 0 40px; }
}

/* ═══════════════════════════ NAV ═══════════════════════════════════ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  background: rgba(3, 5, 13, 0.75);
  border-bottom: 1px solid var(--c-line);
  transition: background 0.3s, border-color 0.3s;
}
[data-theme="light"] .nav {
  background: rgba(248, 250, 255, 0.82);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 58px;
  padding: 0 24px;
  max-width: var(--maxw);
  margin: 0 auto;
}
@media (min-width: 768px) {
  .nav-inner { padding: 0 40px; gap: 16px; }
}

/* Brand / logotype */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--c-fg);
  flex-shrink: 0;
}
.brand-glyph {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--c-accent);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.brand-glyph svg { display: block; }
.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--c-dim);
  font-weight: 400;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex: 1;
}
@media (min-width: 768px) {
  .nav-links { display: flex; }
}
.nav-links a {
  padding: 6px 11px;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  color: var(--c-dim);
  transition: color 0.2s, background 0.2s;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--c-fg);
  background: var(--c-600);
}
.nav-links a.cta {
  margin-left: 8px;
  background: var(--c-accent);
  color: var(--c-900);
  font-weight: 700;
  padding: 7px 15px;
  border-radius: var(--r-sm);
}
.nav-links a.cta:hover { opacity: 0.88; background: var(--c-accent); color: var(--c-900); }

.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 6px; }
@media (min-width: 768px) { .nav-actions { margin-left: 0; } }

/* Icon buttons (theme, hamburger) */
.icon-btn {
  width: 36px; height: 36px;
  border: none;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--c-dim);
  display: grid;
  place-items: center;
  transition: background 0.2s, color 0.2s;
}
.icon-btn:hover { background: var(--c-600); color: var(--c-fg); }
.icon-btn:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.nav-toggle { display: grid; }
@media (min-width: 768px) { .nav-toggle { display: none; } }

/* Mobile nav open state */
.nav-links.open {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  position: absolute;
  top: 58px;
  left: 0; right: 0;
  background: var(--c-800);
  border-bottom: 1px solid var(--c-line);
  padding: 12px 24px 16px;
  z-index: 99;
}
.nav-links.open a { width: 100%; }
.nav-links.open a.cta { margin-left: 0; margin-top: 6px; }

/* ═══════════════════════════ HERO ══════════════════════════════════ */
.hero {
  position: relative;
  padding: 80px 0 72px;
  overflow: hidden;
}
@media (min-width: 900px) { .hero { padding: 100px 0 88px; } }

/* Compass backdrop — inline SVG via bg-image for zero DOM weight */
.hero-compass {
  position: absolute;
  right: -60px;
  top: -40px;
  width: min(580px, 90vw);
  height: min(580px, 90vw);
  pointer-events: none;
  opacity: 0.22;
  animation: compassSpin 120s linear infinite;
}
@media (prefers-reduced-motion: reduce) { .hero-compass { animation: none; } }
@keyframes compassSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.hero-grid {
  display: grid;
  gap: 56px 64px;
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.hero h1 { margin-top: 18px; }
.hero h1 .accent { color: var(--c-accent); }

.lede {
  margin: 20px 0 32px;
  font-size: clamp(1rem, 1.8vw + 0.4rem, 1.18rem);
  color: var(--c-dim);
  line-height: 1.7;
  max-width: 52ch;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Stats row */
.stat-row {
  display: flex;
  gap: 0;
  margin-top: 52px;
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--c-800);
}
.stat {
  flex: 1;
  padding: 18px 20px;
  border-right: 1px solid var(--c-line);
  min-width: 0;
}
.stat:last-child { border-right: none; }
.stat-n {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-accent);
  line-height: 1;
}
.stat-u { font-size: 1.1rem; font-weight: 600; }
.stat-l {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-faint);
  margin-top: 4px;
}

/* Module preview cards in hero */
.hero-modules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.hero-mod-card {
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  padding: 18px 18px 16px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s var(--ease), box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}
.hero-mod-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.hero-mod-card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.hero-mod-card .mod-icon {
  width: 36px; height: 36px;
}
.hero-mod-card .mod-name {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.2;
}
.hero-mod-card .mod-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-faint);
  text-transform: uppercase;
}

/* ═══════════════════════════ BUTTONS ═══════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 22px;
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: opacity 0.18s, transform 0.18s var(--ease), box-shadow 0.18s;
  text-decoration: none;
  line-height: 1;
}
.btn:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--c-accent);
  color: var(--c-900);
  box-shadow: 0 4px 20px -6px var(--c-accent-glow);
}
.btn-primary:hover { opacity: 0.88; }
.btn-ghost {
  background: transparent;
  color: var(--c-fg);
  border: 1px solid var(--c-line);
}
.btn-ghost:hover { background: var(--c-600); border-color: var(--c-dim); }
.btn-sm { padding: 7px 14px; font-size: 0.82rem; }
.btn-mod {
  color: #000;
  font-weight: 700;
}

/* ═══════════════════════════ MODULE CARDS ══════════════════════════ */
.module-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
}

.outcome-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 360px), 1fr));
}
.outcome-card {
  background: linear-gradient(180deg, var(--c-800), var(--c-850));
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  color: inherit;
  min-height: 250px;
  position: relative;
  overflow: hidden;
  transition: transform 0.22s var(--ease), border-color 0.22s, box-shadow 0.22s;
}
.outcome-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-core), var(--c-sprints), var(--c-legacy), var(--c-automation), var(--c-azure));
}
.outcome-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-accent-dim);
  box-shadow: var(--shadow-card);
}
.outcome-card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.outcome-card-top { display: flex; gap: 7px; flex-wrap: wrap; align-items: center; }
.outcome-card h3 { font-size: 1.12rem; }
.outcome-card p { margin: 0; color: var(--c-dim); font-size: 0.88rem; line-height: 1.65; }
.outcome-id {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.outcome-metrics {
  margin: auto 0 0;
  padding-left: 18px;
  color: var(--c-dim);
  font-size: 0.78rem;
  line-height: 1.55;
}

.mod-card {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: 0;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform 0.22s var(--ease), box-shadow 0.22s;
  cursor: pointer;
}
.mod-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.mod-card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }

.mod-card-header {
  padding: 24px 24px 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid var(--c-line);
  position: relative;
}
.mod-card-header::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  background: var(--mod-color, var(--c-accent));
}
.mod-card-icon { width: 44px; height: 44px; flex-shrink: 0; }
.mod-card-title-block { flex: 1; min-width: 0; }
.mod-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.mod-card-id {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mod-color, var(--c-accent));
  margin-top: 4px;
}

.mod-card-body { padding: 18px 24px 20px; flex: 1; display: flex; flex-direction: column; gap: 16px; }
.mod-card-desc { font-size: 0.875rem; color: var(--c-dim); line-height: 1.65; }

.mod-card-meta {
  display: flex;
  gap: 10px;
  margin-top: auto;
}
.mod-stat {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: 5px;
  padding: 4px 9px;
  color: var(--c-dim);
}
.mod-stat strong { color: var(--mod-color, var(--c-accent)); font-weight: 700; }

.mod-card-tracks { display: flex; flex-wrap: wrap; gap: 6px; }
.track-pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  background: var(--c-700);
  color: var(--c-dim);
  border-radius: 4px;
  padding: 3px 8px;
  white-space: nowrap;
  border: 1px solid var(--c-line);
}

/* ═══════════════════════════ CHALLENGE CARDS ═══════════════════════ */
.challenge-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
}

.ch-card {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  padding: 18px 20px 16px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s var(--ease), border-color 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}
.ch-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--mod-color, var(--c-accent));
  border-radius: var(--r) 0 0 var(--r);
}
.ch-card:hover { transform: translateX(3px); box-shadow: var(--shadow-card); border-color: var(--mod-color, var(--c-line)); }
.ch-card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }

.ch-card-top { display: flex; align-items: center; gap: 10px; }
.ch-mod-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--mod-color, var(--c-accent));
  flex-shrink: 0;
}
.ch-module-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mod-color, var(--c-dim));
}
.ch-title {
  font-family: var(--font-display);
  font-size: 0.97rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.25;
}
.ch-desc {
  font-size: 0.82rem;
  color: var(--c-dim);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ch-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: auto;
}
.ch-tags { display: flex; gap: 5px; flex-wrap: wrap; flex: 1; min-width: 0; }

/* ═══════════════════════════ BADGES ════════════════════════════════ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.04em;
  padding: 3px 7px;
  border-radius: 4px;
  white-space: nowrap;
  border: 1px solid transparent;
  text-transform: uppercase;
  font-weight: 600;
}
.badge-difficulty-beginner   { background: rgba(74, 222, 128, 0.12); color: var(--c-beginner); border-color: rgba(74, 222, 128, 0.2); }
.badge-difficulty-intermediate { background: rgba(250, 204, 21, 0.12); color: var(--c-intermediate); border-color: rgba(250, 204, 21, 0.2); }
.badge-difficulty-advanced   { background: rgba(248, 113, 113, 0.12); color: var(--c-advanced); border-color: rgba(248, 113, 113, 0.2); }
.badge-duration {
  background: var(--c-700);
  color: var(--c-dim);
  border-color: var(--c-line);
}
.badge-emu {
  background: rgba(74, 222, 128, 0.08);
  color: var(--c-beginner);
  border-color: rgba(74, 222, 128, 0.15);
}
.badge-emu-no {
  background: rgba(248, 113, 113, 0.08);
  color: var(--c-advanced);
  border-color: rgba(248, 113, 113, 0.15);
}
.badge-app {
  background: var(--c-700);
  color: var(--c-dim);
  border-color: var(--c-line);
}
.badge-tag {
  background: var(--c-600);
  color: var(--c-faint);
  border-color: transparent;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  font-size: 0.68rem;
}
.badge-tag:hover { color: var(--c-dim); }
.badge-outcome {
  background: rgba(232, 200, 74, 0.10);
  color: var(--c-accent);
  border-color: rgba(232, 200, 74, 0.20);
  text-transform: none;
  letter-spacing: 0;
}

/* ═══════════════════════════ FILTERS ═══════════════════════════════ */
.filters {
  position: sticky;
  top: 58px;
  z-index: 40;
  background: var(--c-850);
  border-bottom: 1px solid var(--c-line);
  padding: 10px 0;
  backdrop-filter: blur(12px);
}
.filters-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}
.filter-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.filter-group-wide { flex-basis: 100%; }
.filter-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-faint);
  white-space: nowrap;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 5px 11px;
  border-radius: 5px;
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-dim);
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.chip:hover { background: var(--c-600); color: var(--c-fg); }
.chip.active { color: var(--c-900); border-color: transparent; background: var(--c-accent); font-weight: 700; }
.chip.active[data-category="core-tracks"]          { background: var(--c-core); }
.chip.active[data-category="team-sprints"]         { background: var(--c-sprints); }
.chip.active[data-category="legacy-modernization"] { background: var(--c-legacy); }
.chip.active[data-category="workflow-automation"]  { background: var(--c-automation); }
.chip.active[data-category="azure-platform"]       { background: var(--c-azure); }
.chip-outcome { max-width: 260px; overflow: hidden; text-overflow: ellipsis; }

/* Search box */
.search-box {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  padding: 0 12px;
  flex: 1;
  min-width: 200px;
  max-width: 320px;
  transition: border-color 0.2s;
}
.search-box:focus-within { border-color: var(--c-accent); }
.search-box svg { color: var(--c-faint); flex-shrink: 0; }
.search-box input {
  background: transparent;
  border: none;
  outline: none;
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--c-fg);
  padding: 8px 0;
}
.search-box input::placeholder { color: var(--c-faint); }

.result-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-faint);
  margin-left: auto;
  white-space: nowrap;
}

/* ═══════════════════════════ SECTION HEADS ════════════════════════ */
.shead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.shead p {
  margin: 14px 0 0;
  color: var(--c-dim);
  max-width: 58ch;
  line-height: 1.7;
}
.link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-accent);
  transition: gap 0.2s;
  white-space: nowrap;
}
.link:hover { gap: 8px; }

/* Group heading in catalog */
.group-head {
  padding: 14px 0 10px;
  margin-top: 32px;
  border-top: 1px solid var(--c-line);
  display: flex;
  align-items: center;
  gap: 12px;
  scroll-margin-top: 72px;
}
.group-head:first-child { margin-top: 0; border-top: none; }
.group-head h3 { font-size: 1rem; font-weight: 700; }
.group-head .group-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--c-faint);
}

/* ═══════════════════════════ CATALOG PAGE ══════════════════════════ */
.catalog-hero {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--c-line);
}
.catalog-hero h1 { margin-top: 14px; }
.catalog-hero p { margin: 14px 0 0; color: var(--c-dim); max-width: 58ch; line-height: 1.7; }

/* Empty/loading state */
.empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 56px 20px;
  color: var(--c-faint);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* ═══════════════════════════ MODULE PAGE ════════════════════════════ */
.module-hero {
  padding: 60px 0 52px;
  position: relative;
  overflow: hidden;
}
.module-hero-inner {
  position: relative;
  z-index: 1;
}
.module-hero .mod-accent-bar {
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: var(--mod-color, var(--c-accent));
  margin-bottom: 18px;
}
.module-hero h1 { margin-top: 12px; }
.module-hero .lede { margin: 16px 0 28px; }

.track-list { display: flex; flex-direction: column; gap: 12px; margin-top: 32px; }
.track-item {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, background 0.2s;
}
.track-item:hover { background: var(--c-700); border-color: var(--c-dim); }
.track-item:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.track-item-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--mod-color, var(--c-accent));
  flex-shrink: 0;
}
.track-item-info { flex: 1; min-width: 0; }
.track-item-name { font-weight: 700; font-size: 0.95rem; }
.track-item-desc { font-size: 0.8rem; color: var(--c-dim); margin-top: 3px; }
.track-item-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-faint);
  white-space: nowrap;
}

/* ═══════════════════════════ CHALLENGE DETAIL PAGE ════════════════ */
.detail-layout {
  display: grid;
  gap: 32px;
  align-items: start;
}
@media (min-width: 900px) {
  .detail-layout { grid-template-columns: 1fr 320px; }
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-faint);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.breadcrumbs a { color: var(--c-dim); transition: color 0.15s; }
.breadcrumbs a:hover { color: var(--c-accent); }
.breadcrumbs span { color: var(--c-faint); }

/* Guide view switch */
.view-switch {
  display: flex;
  gap: 4px;
  background: var(--c-700);
  border-radius: var(--r-sm);
  padding: 4px;
  margin-bottom: 24px;
  width: fit-content;
}
.view-switch button {
  padding: 7px 16px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--c-dim);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}
.view-switch button[aria-pressed="true"] { background: var(--c-800); color: var(--c-fg); }
.view-switch button:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }

/* Coach flag banner */
.coach-flag {
  display: none;
  align-items: center;
  gap: 10px;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.25);
  border-radius: var(--r-sm);
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--c-ghas);
  margin-bottom: 20px;
}
[data-view="coach"] .coach-flag { display: flex; }

/* Markdown guide area */
.guide-body {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  padding: 28px 32px;
  min-height: 200px;
}

/* Markdown styles inside .guide-body */
.guide-body h1 { font-size: 1.6rem; margin-bottom: 1rem; margin-top: 0; border-bottom: 1px solid var(--c-line); padding-bottom: 0.7rem; }
.guide-body h2 { font-size: 1.25rem; margin: 2rem 0 0.8rem; }
.guide-body h3 { font-size: 1rem; margin: 1.5rem 0 0.6rem; }
.guide-body p { margin: 0 0 1rem; font-size: 0.925rem; line-height: 1.75; }
.guide-body ul, .guide-body ol { margin: 0.5rem 0 1rem; padding-left: 1.5rem; }
.guide-body li { margin-bottom: 0.35rem; font-size: 0.925rem; line-height: 1.7; }
.guide-body a { color: var(--c-accent); text-decoration: underline; text-decoration-color: transparent; transition: text-decoration-color 0.2s; }
.guide-body a:hover { text-decoration-color: var(--c-accent); }
.guide-body code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--c-700);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--c-accent);
}
.guide-body pre {
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 0 0 1rem;
}
.guide-body pre code {
  background: none;
  padding: 0;
  font-size: 0.83rem;
  color: var(--c-fg);
  line-height: 1.6;
}
.guide-body blockquote {
  border-left: 3px solid var(--c-accent);
  margin: 1rem 0;
  padding: 8px 16px;
  background: var(--c-accent-glow);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.guide-body blockquote p { margin: 0; font-size: 0.9rem; color: var(--c-dim); }
.guide-body table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.875rem; }
.guide-body th { background: var(--c-700); padding: 8px 12px; text-align: left; font-weight: 700; border-bottom: 1px solid var(--c-line); }
.guide-body td { padding: 8px 12px; border-bottom: 1px solid var(--c-line-soft); }
.guide-body hr { border: none; border-top: 1px solid var(--c-line); margin: 1.5rem 0; }

/* Facts sidebar */
.facts-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: sticky;
  top: 72px;
}
.panel {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  overflow: hidden;
}
.panel-head {
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-faint);
  border-bottom: 1px solid var(--c-line);
  background: var(--c-700);
}
.panel-body { padding: 12px 16px; }
.fact-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--c-line-soft);
  font-size: 0.82rem;
}
.fact-row:last-child { border-bottom: none; padding-bottom: 0; }
.fact-key { color: var(--c-faint); flex-shrink: 0; }
.fact-val { text-align: right; color: var(--c-dim); word-break: break-word; }

/* Prerequisites list */
.prereq-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.prereq-item {
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.prereq-item::before { content: "→"; color: var(--c-accent); font-family: var(--font-mono); font-size: 0.75rem; }

/* Capability list */
.cap-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 4px; }
.cap-item {
  font-size: 0.82rem;
  color: var(--c-dim);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.cap-item::before { content: "·"; color: var(--c-faint); font-family: var(--font-mono); flex-shrink: 0; }

/* Success criteria */
.criteria-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 5px; }
.criteria-item {
  font-size: 0.82rem;
  color: var(--c-dim);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.criteria-item::before {
  content: "✓";
  color: var(--c-beginner);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Related challenges */
.related-grid { display: flex; flex-direction: column; gap: 8px; }
.related-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  background: var(--c-700);
  border: 1px solid var(--c-line);
  text-decoration: none;
  color: inherit;
  font-size: 0.8rem;
  transition: background 0.15s, border-color 0.15s;
}
.related-item:hover { background: var(--c-600); border-color: var(--c-dim); }
.related-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }

/* ═══════════════════════════ HOW IT WORKS ══════════════════════════ */
.how-it-works {
  background: var(--c-800);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.steps-grid {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr));
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  overflow: hidden;
  margin-top: 36px;
}
.step-item {
  padding: 24px 24px 22px;
  border-right: 1px solid var(--c-line);
  position: relative;
}
.step-item:last-child { border-right: none; }
@media (max-width: 767px) {
  .step-item { border-right: none; border-bottom: 1px solid var(--c-line); }
  .step-item:last-child { border-bottom: none; }
}
.step-num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--c-line);
  line-height: 1;
  margin-bottom: 12px;
}
.step-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.step-desc { font-size: 0.82rem; color: var(--c-dim); line-height: 1.65; }

/* ═══════════════════════════ FOOTER ════════════════════════════════ */
.footer {
  border-top: 1px solid var(--c-line);
  padding: 36px 0;
  margin-top: auto;
}
.footer-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.footer p {
  margin: 0;
  font-size: 0.78rem;
  color: var(--c-faint);
  flex: 1;
  min-width: 200px;
  line-height: 1.6;
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  font-size: 0.78rem;
  color: var(--c-faint);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--c-accent); }

/* ═══════════════════════════ REVEAL ANIMATION ══════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ═══════════════════════════ UTILITIES ═════════════════════════════ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.text-accent { color: var(--c-accent); }
.text-dim { color: var(--c-dim); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--c-faint);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Category-specific color utility classes */
.cat-core-tracks           { --cat-color: var(--c-core); }
.cat-team-sprints          { --cat-color: var(--c-sprints); }
.cat-legacy-modernization  { --cat-color: var(--c-legacy); }
.cat-workflow-automation   { --cat-color: var(--c-automation); }
.cat-azure-platform        { --cat-color: var(--c-azure); }

/* Challenge detail page hero */
.ch-detail-hero {
  padding: 52px 0 40px;
  border-bottom: 1px solid var(--c-line);
}
.ch-detail-hero h1 { margin-top: 14px; font-size: clamp(1.6rem, 3.5vw + 0.5rem, 2.8rem); }
.ch-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

/* Source attribution line */
.attribution {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-faint);
  margin-top: 12px;
}
.attribution a { color: var(--c-accent); }
.attribution a:hover { text-decoration: underline; }

/* ═══════════════════════ COACH SET BUILDER ═════════════════════════ */
/* Selection card — same look as .ch-card but acts as a toggle button.   */
.sel-card {
  width: 100%;
  text-align: left;
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  padding: 18px 20px 16px 44px;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  font-family: var(--font-body);
  transition: transform 0.2s var(--ease), border-color 0.2s, box-shadow 0.2s;
}
.sel-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--mod-color, var(--c-accent));
  border-radius: var(--r) 0 0 var(--r);
}
.sel-card:hover { transform: translateX(3px); box-shadow: var(--shadow-card); border-color: var(--mod-color, var(--c-line)); }
.sel-card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.sel-check {
  position: absolute;
  left: 16px; top: 18px;
  width: 18px; height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--c-line);
  background: var(--c-700);
  display: grid;
  place-items: center;
  transition: background 0.15s, border-color 0.15s;
}
.sel-check svg { opacity: 0; transition: opacity 0.15s; }
.sel-card[aria-pressed="true"] {
  border-color: var(--mod-color, var(--c-accent));
  background: color-mix(in srgb, var(--mod-color, var(--c-accent)) 7%, var(--c-800));
}
.sel-card[aria-pressed="true"] .sel-check {
  background: var(--mod-color, var(--c-accent));
  border-color: var(--mod-color, var(--c-accent));
}
.sel-card[aria-pressed="true"] .sel-check svg { opacity: 1; }

/* Sticky selection tray */
.set-tray {
  position: sticky;
  bottom: 0;
  z-index: 50;
  background: var(--c-850);
  border-top: 1px solid var(--c-line);
  backdrop-filter: blur(12px);
  padding: 12px 0;
}
.set-tray-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.set-tray .set-name-box {
  display: flex;
  align-items: center;
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  padding: 0 12px;
  flex: 1;
  min-width: 200px;
  max-width: 360px;
  transition: border-color 0.2s;
}
.set-tray .set-name-box:focus-within { border-color: var(--c-accent); }
.set-tray .set-name-box input {
  background: transparent; border: none; outline: none; width: 100%;
  font-family: var(--font-body); font-size: 0.875rem; color: var(--c-fg);
  padding: 9px 0;
}
.set-tray .set-name-box input::placeholder { color: var(--c-faint); }
.set-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-dim);
  white-space: nowrap;
}
.set-count strong { color: var(--c-accent); }
.set-link-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 0 100%;
  margin-top: 4px;
}
.set-link-row input {
  flex: 1;
  min-width: 0;
  background: var(--c-700);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--c-fg);
}
.set-link-row[hidden] { display: none; }

/* ═══════════════════════ KIOSK / CURATED VIEW ══════════════════════ */
html[data-kiosk] .nav-links,
html[data-kiosk] .footer-links,
html[data-kiosk] .nav-toggle,
html[data-kiosk] .breadcrumbs { display: none !important; }
/* Brand stays visible for identity but is no longer an escape hatch */
html[data-kiosk] .brand { pointer-events: none; cursor: default; }

.kiosk-exit {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.kiosk-exit:hover { color: var(--c-fg); background: var(--c-600); border-color: var(--c-dim); }
.kiosk-exit:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }