:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #181825;
  --fg: #e4e4ef;
  --fg-muted: #7a7a8e;
  --fg-dim: #4a4a5e;
  --accent: #00e676;
  --accent-dim: rgba(0, 230, 118, 0.15);
  --negative: #ff5252;
  --negative-dim: rgba(255, 82, 82, 0.15);
  --sell: #ff6b6b;
  --buy: #4ecdc4;
  --border: #1e1e2e;
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-display);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 5vw 60px;
  position: relative;
  background: linear-gradient(160deg, #0a0a0f 0%, #0d1117 50%, #0a0f0d 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse at 70% 30%, rgba(0, 230, 118, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  align-items: center;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 28px;
  letter-spacing: -1px;
}

.hero .accent {
  color: var(--accent);
}

.lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.7;
}

/* Terminal mockup */
.hero-terminal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.terminal-dot.red { background: var(--negative); }
.terminal-dot.yellow { background: #ffb74d; }
.terminal-dot.green { background: var(--accent); }

.terminal-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-muted);
  margin-left: 8px;
}

.terminal-body {
  padding: 4px 0;
}

.chain-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-muted);
  border-bottom: 1px solid rgba(30, 30, 46, 0.5);
  transition: background 0.15s;
}

.chain-row.header {
  color: var(--fg-dim);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.chain-row.active {
  background: var(--accent-dim);
  color: var(--fg);
}

.chain-row .strike { color: var(--fg); font-weight: 500; }
.chain-row .bid { color: var(--accent); }
.chain-row .ask { color: var(--sell); }
.chain-row .iv-hot { color: #ffb74d; font-weight: 500; }

.pnl-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: var(--bg-elevated);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.pnl-label { color: var(--fg-dim); }
.pnl-value.positive { color: var(--accent); font-weight: 600; }
.pnl-max { color: var(--fg-dim); margin-left: auto; }

/* ===== PROBLEM ===== */
.problem {
  padding: 120px 5vw;
  background: var(--bg);
}

.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.problem h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 600;
  text-align: center;
  margin-bottom: 64px;
  letter-spacing: -0.5px;
}

.problem-cards {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.problem-card {
  padding: 40px 32px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.problem-card.divider {
  background: linear-gradient(135deg, rgba(0, 230, 118, 0.08) 0%, var(--bg-card) 100%);
  border-color: rgba(0, 230, 118, 0.2);
}

.card-icon {
  font-size: 1.5rem;
  color: var(--fg-dim);
  margin-bottom: 20px;
}

.card-icon.pulse {
  color: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.problem-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.problem-card p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ===== FEATURES ===== */
.features {
  padding: 100px 5vw 120px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 100%);
}

.features-inner {
  max-width: 800px;
  margin: 0 auto;
}

.feature-block {
  display: flex;
  gap: 32px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

.feature-block:last-child {
  border-bottom: none;
}

.feature-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  min-width: 40px;
  padding-top: 4px;
}

.feature-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-content p {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== SPREAD DEMO ===== */
.spread-demo {
  padding: 120px 5vw;
  background: var(--bg-elevated);
}

.spread-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.spread-text h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 600;
  margin-bottom: 20px;
  line-height: 1.2;
}

.spread-text p {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

.spread-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.spread-title {
  padding: 16px 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--fg-muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.5px;
}

.spread-legs {
  padding: 8px 0;
}

.leg {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.leg.sell { color: var(--sell); }
.leg.buy { color: var(--buy); }

.leg-action {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 2px 8px;
  border-radius: 3px;
  min-width: 42px;
  text-align: center;
}

.leg.sell .leg-action { background: var(--negative-dim); }
.leg.buy .leg-action { background: rgba(78, 205, 196, 0.15); }

.spread-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  padding: 16px 24px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.stat { text-align: center; }

.stat-label {
  display: block;
  font-size: 0.65rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
}

.stat-value.positive { color: var(--accent); }

/* ===== CLOSING ===== */
.closing {
  padding: 140px 5vw;
  background: var(--bg);
  text-align: center;
  position: relative;
}

.closing::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.3;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
}

.closing-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 40px 5vw;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

.footer-note {
  font-size: 0.8rem;
  color: var(--fg-dim);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero {
    padding: 60px 6vw 40px;
    min-height: auto;
  }

  .problem-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .spread-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature-block {
    gap: 20px;
  }

  .chain-row {
    font-size: 0.7rem;
    padding: 8px 12px;
  }

  .closing { padding: 80px 6vw; }
  .problem { padding: 80px 6vw; }
  .features { padding: 60px 6vw 80px; }
  .spread-demo { padding: 80px 6vw; }
}