/* === MP Signal Academy — Professional Course Styles === */
:root {
  --gold: #D4A843; --gold-bright: #F0C040; --gold-dim: #8B7320;
  --bg: #07070c; --bg2: #0d0d14; --bg3: #12121d;
  --card: #13131f; --card-hover: #181827; --border: #1e1e30;
  --text: #e2e2e2; --text2: #999; --text3: #666;
  --green: #00c853; --red: #ff1744; --blue: #448aff;
  --teal: #00bfa5; --purple: #7c4dff;
  --radius: 10px; --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  font-size: 16px; line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* Typography */
h1, h2, h3, h4, h5, h6 { color: #fff; line-height: 1.3; }
h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.9rem; letter-spacing: -0.01em; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }
p { margin-bottom: 1.2em; color: var(--text2); }
strong { color: var(--text); }
a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-bright); }

code {
  background: var(--bg2); color: var(--teal);
  padding: 2px 7px; border-radius: 4px; font-size: .88rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

ul, ol { margin: 0 0 1.2em 1.5em; color: var(--text2); }
li { margin-bottom: .4em; }

/* ========== NAV ========== */
nav {
  background: rgba(7,7,12,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.05);
  position: sticky; top: 0; z-index: 100;
}
nav .nav-inner { display:flex; justify-content:space-between; align-items:center; padding:14px 24px; max-width:1100px; margin:0 auto; }
nav .logo { color: var(--gold); font-weight:800; font-size:1.1rem; letter-spacing:-.01em; }
nav .nav-links { display:flex; gap:22px; align-items:center; }
nav .nav-links a { color: var(--text2); font-size:.9rem; font-weight:500; }
nav .nav-links a:hover, nav .nav-links a.active { color: var(--gold); }

/* ========== HERO ========== */
.hero {
  padding: 90px 0 60px; text-align: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(212,168,67,.08) 0%, transparent 70%);
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-dim), transparent);
}
.hero .pretitle {
  display: inline-flex; align-items:center; gap: 8px;
  background: rgba(212,168,67,.1); border: 1px solid rgba(212,168,67,.2);
  padding: 6px 18px; border-radius: 20px; font-size: .8rem;
  color: var(--gold); font-weight: 600; letter-spacing: .8px;
  margin-bottom: 24px;
}
.hero .pretitle .dot { width:7px; height:7px; background:var(--gold); border-radius:50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.hero h1 { margin-bottom: 18px; }
.hero h1 .gold { color: var(--gold); }
.hero .subtitle { font-size: 1.15rem; color: var(--text2); max-width: 680px; margin: 0 auto 32px; }
.hero-stats { display: flex; justify-content: center; gap: 36px; flex-wrap: wrap; margin: 28px 0; }
.hero-stat { text-align: center; min-width: 90px; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--gold); font-variant-numeric: tabular-nums; }
.hero-stat .label { font-size: .78rem; color: var(--text2); text-transform: uppercase; letter-spacing: .5px; }
.hero-btns { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-top:10px; }
.btn {
  display:inline-flex; align-items:center; gap:6px;
  padding: 13px 30px; border-radius: 8px; font-weight: 700;
  font-size: .95rem; cursor: pointer; border: none;
  transition: all .2s; text-decoration: none;
}
.btn-gold { background: var(--gold); color: #000; }
.btn-gold:hover { background: var(--gold-bright); }
.btn-outline { background: transparent; border: 2px solid var(--border); color: var(--gold); }
.btn-outline:hover { border-color: var(--gold); }

/* ========== SECTION HEADERS ========== */
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { margin-bottom: 10px; }
.section-header .lead { font-size: 1.08rem; color: var(--text2); max-width: 600px; margin: 0 auto; }

/* ========== TRACK SELECTOR ========== */
.track-selector {
  display:flex; justify-content:center; gap:12px; margin-bottom:48px; flex-wrap:wrap;
}
.track-card {
  flex:1; min-width:200px; max-width:260px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px; text-align:center;
  cursor: pointer; transition: all .25s; position:relative;
}
.track-card:hover { border-color: var(--gold-dim); background: var(--card-hover); }
.track-card.active { border-color: var(--gold); background: rgba(212,168,67,.06); }
.track-card .track-icon { font-size: 2.2rem; margin-bottom: 12px; }
.track-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.track-card p { font-size: .82rem; color: var(--text3); margin-bottom:0; }
.track-card .track-tag {
  position: absolute; top: -10px; right: -10px;
  background: var(--gold); color: #000; font-size: .68rem;
  font-weight: 800; padding: 3px 10px; border-radius: 12px;
  letter-spacing: .3px;
}

/* ========== CURRICULUM ========== */
.curriculum { padding: 60px 0; }
.module {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); margin-bottom: 14px;
  overflow: hidden; transition: border-color .2s;
}
.module:hover { border-color: #2a2a40; }
.module-header {
  padding: 22px 28px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  user-select: none;
}
.module-header:hover { background: rgba(255,255,255,.01); }
.module-left { display:flex; align-items:center; gap:18px; }
.module-num {
  width: 48px; height: 48px; border-radius: 12px;
  display:flex; align-items:center; justify-content:center;
  font-weight: 800; font-size: 1.1rem; flex-shrink: 0;
  background: rgba(212,168,67,.08); color: var(--gold);
  border: 1px solid rgba(212,168,67,.2);
}
.module-info .module-label { font-size: .72rem; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 2px; }
.module-info .module-title { font-size: 1.15rem; color: #fff; font-weight: 600; }
.module-info .module-meta { font-size: .8rem; color: var(--text3); margin-top: 3px; }
.module-arrow {
  font-size: 1.2rem; color: var(--text3); transition: transform .3s;
  flex-shrink: 0;
}
.module.active .module-arrow { transform: rotate(180deg); color: var(--gold); }
.module-body {
  padding: 0 28px 28px 94px; display: none;
  border-top: 1px solid var(--border);
}
.module.active .module-body { display: block; padding-top: 22px; }

/* Lesson list */
.lesson-list { list-style: none; margin: 0; display: grid; gap: 4px; }
.lesson-list li {
  padding: 9px 12px; border-radius: 6px; color: var(--text2);
  font-size: .92rem; display: flex; align-items: center; gap: 10px;
  transition: background .15s;
}
.lesson-list li:hover { background: rgba(255,255,255,.02); }
.lesson-list li .l-num {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--bg3); color: var(--text3);
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 700; flex-shrink: 0;
}
.lesson-list li.pro-lesson .l-num { background: rgba(212,168,67,.12); color: var(--gold); }
.lesson-list li .l-badge {
  font-size: .65rem; padding: 2px 7px; border-radius: 4px;
  font-weight: 700; letter-spacing: .3px; margin-left: auto; flex-shrink: 0;
}
.l-badge.pro { background: rgba(212,168,67,.15); color: var(--gold); }
.l-badge.vis { background: rgba(68,138,255,.12); color: var(--blue); }
.l-badge.core { background: rgba(0,191,165,.12); color: var(--teal); }

/* Module depth tags */
.depth-tags { display:flex; gap:6px; margin-top:12px; }
.depth-tag {
  font-size: .68rem; padding: 3px 10px; border-radius: 12px;
  font-weight: 600; letter-spacing: .3px;
}
.depth-tag.foundation { background: rgba(68,138,255,.1); color: var(--blue); }
.depth-tag.application { background: rgba(0,191,165,.1); color: var(--teal); }
.depth-tag.mastery { background: rgba(124,77,255,.1); color: var(--purple); }

/* ========== VISUAL CONCEPT CARDS ========== */
.concept-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(280px, 1fr)); gap:20px; margin: 30px 0; }
.concept-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; transition: all .2s;
}
.concept-card:hover { border-color: #2a2a40; transform: translateY(-1px); }
.concept-card .concept-icon { font-size: 1.8rem; margin-bottom: 14px; }
.concept-card h4 { margin-bottom: 8px; font-size: 1.05rem; }
.concept-card p { font-size: .88rem; color: var(--text3); margin-bottom:0; }

/* ========== SVG DIAGRAMS ========== */
.diagram-container {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  margin: 32px 0; position: relative; overflow: hidden;
}
.diagram-container .diagram-label {
  position: absolute; top: 12px; right: 16px;
  font-size: .7rem; color: var(--text3); letter-spacing: .5px;
}
.diagram-container svg { display:block; margin:0 auto; max-width:100%; }
.diagram-caption {
  text-align: center; font-size: .85rem; color: var(--text3);
  margin-top: 12px; font-style: italic;
}

/* ========== CODE BLOCKS / FORMULAS ========== */
.formula-block {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px;
  margin: 20px 0; overflow-x: auto;
}
.formula-block code { background: none; color: var(--teal); font-size: .9rem; line-height: 1.8; }
.formula-label {
  font-size: .72rem; color: var(--text3); text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 6px;
}

/* ========== VISUALIZATION CARDS ========== */
.viz-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  margin: 24px 0;
}
.viz-card h4 { margin-bottom: 16px; display:flex; align-items:center; gap:10px; }
.viz-card h4 .viz-icon { font-size:1.3rem; }

/* ========== TABLE ========== */
.data-table { width:100%; border-collapse:collapse; font-size:.88rem; margin:20px 0; }
.data-table thead th {
  text-align:left; padding:12px 16px; border-bottom:2px solid var(--gold-dim);
  color: var(--gold); font-size:.78rem; letter-spacing:.3px; text-transform:uppercase;
}
.data-table tbody td {
  padding:11px 16px; border-bottom:1px solid var(--border);
  color: var(--text2);
}
.data-table tbody tr:hover td { background: rgba(255,255,255,.01); }
.data-table .num { font-variant-numeric: tabular-nums; color: var(--text); }

/* ========== CALLOUTS ========== */
.callout {
  border-left: 3px solid var(--gold); background: rgba(212,168,67,.04);
  padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}
.callout p { margin-bottom:0; }
.callout.warning { border-left-color: var(--red); background: rgba(255,23,68,.04); }
.callout.info { border-left-color: var(--blue); background: rgba(68,138,255,.04); }
.callout.success { border-left-color: var(--green); background: rgba(0,200,83,.04); }

/* ========== TIMELINE (Session) ========== */
.session-timeline {
  display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 2px; margin: 24px 0;
}
.session-block {
  padding: 14px; text-align:center; font-size:.78rem; font-weight:600;
  border-radius: 6px;
}
.session-block.asian { background: rgba(68,138,255,.08); color: var(--blue); }
.session-block.london { background: rgba(0,191,165,.08); color: var(--teal); }
.session-block.ny { background: rgba(255,23,68,.08); color: var(--red); }
.session-block.overlap { background: rgba(240,192,64,.08); color: var(--gold-bright); }

/* ========== COMPARISON ========== */
.compare { overflow-x:auto; margin:24px 0; }
.compare table { width:100%; border-collapse:collapse; font-size:.85rem; }
.compare th { text-align:left; padding:14px 16px; border-bottom:2px solid var(--gold-dim); color: var(--gold); font-size:.75rem; letter-spacing:.4px; }
.compare td { padding:12px 16px; border-bottom:1px solid var(--border); }
.compare tr:nth-child(even) td { background: rgba(255,255,255,.008); }
.compare .check { color: var(--green); font-weight:700; }
.compare .cross { color: var(--text3); }
.compare .partial { color: var(--gold-dim); }

/* ========== PROOF / PERFORMANCE SECTION ========== */
.proof-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:16px; margin:28px 0; }
.proof-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; text-align:center;
}
.proof-card .proof-num { font-size: 2rem; font-weight: 800; color: var(--gold); margin-bottom:4px; }
.proof-card .proof-label { font-size: .78rem; color: var(--text3); text-transform: uppercase; letter-spacing: .4px; }

/* ========== CTA ========== */
.cta-section {
  background: linear-gradient(135deg, rgba(212,168,67,.06), rgba(124,77,255,.04));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 48px; text-align: center; margin: 40px 0;
}
.cta-section h2 { margin-bottom: 10px; }
.cta-section p { max-width: 550px; margin: 0 auto 24px; }

/* ========== FOOTER ========== */
footer { text-align:center; padding:36px 24px; color:var(--text3); font-size:.78rem; border-top:1px solid var(--border); margin-top:60px; }
footer a { color: var(--gold); }

/* ========== UTILITY ========== */
.section-divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: 60px; }
.mb-0 { margin-bottom: 0; }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.45rem; }
  .hero { padding: 60px 0 40px; }
  .hero-stats { gap: 20px; }
  .hero-stat .num { font-size: 1.5rem; }
  .module-body { padding-left: 20px; padding-right: 20px; }
  .module-left { gap: 12px; }
  .session-timeline { grid-template-columns: 1fr 1fr; }
  .track-selector { flex-direction:column; align-items:stretch; }
  .track-card { max-width: none; }
  nav .nav-links { gap: 14px; }
  nav .nav-links a { font-size: .8rem; }
}
@media (max-width: 480px) {
  .hero-stats { flex-direction:column; gap:14px; }
}