/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep: #0B1120;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --fg: #E2E8F0;
  --fg-muted: #94A3B8;
  --fg-dim: #64748B;
  --accent: #00E5FF;
  --accent-glow: rgba(0, 229, 255, 0.15);
  --amber: #FFB547;
  --amber-glow: rgba(255, 181, 71, 0.12);
  --border: rgba(148, 163, 184, 0.1);
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-deep);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* === Typography === */
h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.8rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.25rem; font-weight: 600; }

/* === Sections === */
section { padding: 100px 24px; position: relative; }
.section-inner { max-width: 1080px; margin: 0 auto; }

.section-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 640px;
  margin-top: 16px;
  line-height: 1.7;
}

/* === Hero === */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,229,255,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(255,181,71,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; max-width: 800px; }

.hero-badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(0,229,255,0.3);
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 32px;
  background: rgba(0,229,255,0.06);
}

.hero h1 {
  color: #fff;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--fg-muted);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat { text-align: center; }
.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--fg-dim);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,229,255,0.06) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}

/* === Signals Section === */
.signals {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #0d1526 100%);
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.signal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: border-color 0.3s, background 0.3s;
}

.signal-card:hover {
  border-color: rgba(0,229,255,0.2);
  background: var(--bg-card-hover);
}

.signal-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 12px;
  color: var(--accent);
  margin-bottom: 16px;
}

.signal-card h3 {
  color: #fff;
  margin-bottom: 8px;
}

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

/* === How It Works === */
.how-it-works {
  background: var(--bg-deep);
}

.steps {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: flex;
  gap: 32px;
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}

.step:last-child { border-bottom: none; }

.step-num {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  color: rgba(0,229,255,0.15);
  min-width: 80px;
  line-height: 1;
}

.step-content h3 {
  color: var(--amber);
  margin-bottom: 8px;
  font-size: 1.3rem;
}

.step-content p {
  color: var(--fg-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* === vs Humans === */
.vs-humans {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #0d1526 100%);
}

.comparison-table {
  margin-top: 48px;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-card);
}

.comp-header, .comp-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  align-items: center;
}

.comp-header {
  background: rgba(0,229,255,0.04);
  border-bottom: 1px solid var(--border);
  padding: 16px 28px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.comp-row {
  padding: 18px 28px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.comp-row:last-child { border-bottom: none; }

.comp-label {
  color: var(--fg-muted);
  font-weight: 500;
}

.comp-human {
  color: var(--fg-dim);
  text-align: center;
}

.comp-ai {
  text-align: center;
  color: var(--fg);
}

.comp-ai.highlight {
  color: var(--accent);
  font-weight: 600;
}

/* === Authenticity === */
.authenticity {
  background: var(--bg-deep);
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.auth-point {
  padding: 32px;
  border-left: 2px solid var(--amber);
}

.auth-point h3 {
  color: #fff;
  margin-bottom: 12px;
}

.auth-point p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* === Closing === */
.closing {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #0a0f1a 100%);
  text-align: center;
  padding: 120px 24px;
}

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

.closing h2 {
  color: #fff;
  margin-bottom: 24px;
}

.closing p {
  color: var(--fg-muted);
  font-size: 1.15rem;
  line-height: 1.7;
}

/* === Footer === */
.site-footer {
  padding: 48px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
  background: #080c16;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--fg-dim);
}

/* === Mobile === */
@media (max-width: 768px) {
  section { padding: 72px 20px; }

  .hero { min-height: 80vh; padding: 100px 20px 80px; }

  .hero-stats { gap: 20px; }
  .stat-divider { display: none; }
  .stat-number { font-size: 1.6rem; }

  .signal-grid { grid-template-columns: 1fr; }

  .step { flex-direction: column; gap: 12px; }
  .step-num { font-size: 2rem; }

  .comp-header, .comp-row { grid-template-columns: 1.2fr 1fr 1fr; padding: 14px 16px; }
  .comp-header { font-size: 0.75rem; }
  .comp-row { font-size: 0.85rem; }

  .auth-grid { grid-template-columns: 1fr; gap: 24px; }

  .closing { padding: 80px 20px; }
}