/* =============================================
   AI NEXUS ACADEMY — Shared Theme
   Used across all course pages
   ============================================= */

:root {
  --bg: #04060f;
  --surface: #0c1120;
  --card: #111827;
  --accent: #00d4ff;
  --accent2: #a855f7;
  --gold: #f59e0b;
  --green: #10b981;
  --red: #ef4444;
  --text: #e2e8f0;
  --muted: #64748b;
  --border: rgba(0, 212, 255, 0.13);
  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,.03) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

/* ---- NAV ---- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 5%;
  background: rgba(4,6,15,0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 3px;
  color: var(--accent);
  text-decoration: none;
}
.nav-logo span { color: var(--accent2); }
.nav-links { display: flex; gap: 28px; align-items: center; list-style: none; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .85rem; font-weight: 500; letter-spacing: 1px; text-transform: uppercase; transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-module-tag { font-size: .75rem; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.nav-module-tag span { color: var(--accent); font-weight: 600; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 6px;
  font-family: var(--font-body); font-weight: 700;
  font-size: .88rem; letter-spacing: 1.5px; text-transform: uppercase;
  text-decoration: none; cursor: pointer; border: none; transition: all .22s;
}
.btn-primary { background: var(--accent); color: #04060f; }
.btn-primary:hover { background: #fff; box-shadow: 0 0 28px rgba(0,212,255,.5); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--accent); border: 2px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #04060f; }
.btn-green { background: var(--green); color: #04060f; }
.btn-green:hover { background: #fff; box-shadow: 0 0 28px rgba(16,185,129,.5); transform: translateY(-2px); }
.btn-red { background: var(--red); color: #fff; }
.btn-red:hover { background: #fff; color: var(--red); box-shadow: 0 0 28px rgba(239,68,68,.5); transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: #04060f; font-size: 1rem; padding: 16px 40px; }
.btn-gold:hover { background: #fff; box-shadow: 0 0 36px rgba(245,158,11,.5); transform: translateY(-3px); }
.btn:disabled, .btn[disabled] { opacity: .35; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---- PROGRESS BAR ---- */
.course-progress {
  position: fixed; top: 57px; left: 0; right: 0; z-index: 199;
  height: 3px; background: rgba(255,255,255,.05);
}
.course-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .5s ease;
}

/* ---- CHIPS ---- */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(0,212,255,.1); border: 1px solid var(--accent);
  color: var(--accent); padding: 4px 14px; border-radius: 100px;
  font-size: 10px; font-weight: 500; letter-spacing: 1.5px; text-transform: uppercase;
}
.chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }
.chip.purple { background: rgba(168,85,247,.1); border-color: var(--accent2); color: var(--accent2); }
.chip.purple .dot { background: var(--accent2); }
.chip.gold { background: rgba(245,158,11,.1); border-color: var(--gold); color: var(--gold); }
.chip.green { background: rgba(16,185,129,.1); border-color: var(--green); color: var(--green); }

/* ---- CARDS ---- */
.glass-card {
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.glass-card:hover { border-color: rgba(0,212,255,.3); }

/* ---- ANIMATIONS ---- */
@keyframes fadeUp { from { opacity:0; transform:translateY(18px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes pulse { 0%,100% { opacity:1; transform:scale(1); } 50% { opacity:.4; transform:scale(1.6); } }
@keyframes float { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-8px); } }
@keyframes spin { from { transform:rotate(0deg); } to { transform:rotate(360deg); } }
@keyframes slideInRight { from { opacity:0; transform:translateX(24px); } to { opacity:1; transform:translateX(0); } }
@keyframes pop { from { opacity:0; transform:scale(.75); } to { opacity:1; transform:scale(1); } }
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-8px)} 40%{transform:translateX(8px)} 60%{transform:translateX(-5px)} 80%{transform:translateX(5px)} }
@keyframes successPop { 0%{transform:scale(1)} 50%{transform:scale(1.04)} 100%{transform:scale(1)} }

.anim-up { animation: fadeUp .5s ease both; }
.anim-in { animation: fadeIn .5s ease both; }
.anim-pop { animation: pop .4s cubic-bezier(.4,0,.2,1) both; }

/* ---- TRANSCRIPT ---- */
.transcript-box {
  background: rgba(255,255,255,.025);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin-top: 24px;
}
.transcript-toggle {
  display: flex; align-items: center; gap: 10px;
  cursor: pointer; background: none; border: none;
  color: var(--muted); font-family: var(--font-body);
  font-size: .82rem; font-weight: 500; letter-spacing: 1px;
  text-transform: uppercase; padding: 0; width: 100%;
}
.transcript-toggle .t-icon { color: var(--accent); transition: transform .3s; }
.transcript-toggle.open .t-icon { transform: rotate(180deg); }
.transcript-content { display: none; margin-top: 14px; }
.transcript-content.open { display: block; }
.transcript-content p { font-size: .88rem; color: var(--muted); line-height: 1.8; }

/* ---- AUDIO PLAYER ---- */
.audio-player {
  display: flex; align-items: center; gap: 12px;
  background: rgba(0,212,255,.06);
  border: 1px solid rgba(0,212,255,.2);
  border-radius: 10px;
  padding: 12px 18px;
  margin-bottom: 20px;
}
.audio-play-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--accent); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all .2s; color: #04060f; font-size: .9rem;
}
.audio-play-btn:hover { background: #fff; transform: scale(1.08); }
.audio-play-btn.playing { background: var(--accent2); }
.audio-label { font-size: .78rem; color: var(--muted); letter-spacing: .5px; }
.audio-time { font-size: .75rem; color: var(--accent); margin-left: auto; font-weight: 500; }
.audio-bar { flex: 1; height: 3px; background: rgba(255,255,255,.1); border-radius: 100px; cursor: pointer; position: relative; }
.audio-bar-fill { height: 100%; background: var(--accent); border-radius: 100px; width: 0%; transition: width .1s; pointer-events: none; }

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .site-nav { padding: 12px 4%; }
  .nav-links { display: none; }
}