:root {
  --bg: #0a0c10;
  --bg-elevated: #12151c;
  --bg-card: #161a24;
  --fg: #e8eaf0;
  --fg-muted: #8b91a3;
  --fg-dim: #5a6070;
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.15);
  --accent-secondary: #7c6cff;
  --accent-warm: #ff6b8a;
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 212, 170, 0.2);
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --radius: 12px;
  --max-width: 1100px;
}

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

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

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 120px 40px 100px;
  overflow: hidden;
}

.hero-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: 100px;
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 36px;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-anim 2s ease-in-out infinite;
}

@keyframes pulse-anim {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 212, 170, 0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 8px rgba(0, 212, 170, 0); }
}

.hero h1 {
  font-size: clamp(42px, 6vw, 76px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
  background: linear-gradient(135deg, var(--fg) 0%, var(--fg-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--fg-muted);
  max-width: 600px;
  line-height: 1.7;
}

.helix-visual {
  position: absolute;
  top: 0;
  right: -100px;
  width: 500px;
  height: 100%;
  opacity: 0.15;
  z-index: 1;
}

.strand {
  position: absolute;
  width: 200px;
  height: 200%;
  border-radius: 50%;
  border: 2px solid var(--accent);
}

.strand-1 {
  top: -50%;
  left: 50px;
  transform: rotate(25deg);
  animation: float-strand 20s ease-in-out infinite;
}

.strand-2 {
  top: -30%;
  left: 150px;
  transform: rotate(-15deg);
  border-color: var(--accent-secondary);
  animation: float-strand 25s ease-in-out infinite reverse;
}

.strand-3 {
  top: -40%;
  left: 250px;
  transform: rotate(10deg);
  border-color: var(--accent-warm);
  animation: float-strand 30s ease-in-out infinite;
}

@keyframes float-strand {
  0%, 100% { transform: translateY(0) rotate(25deg); }
  50% { transform: translateY(-40px) rotate(20deg); }
}

/* ===== PROBLEM ===== */
.problem {
  padding: 100px 40px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.overline {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 20px;
}

.problem h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 50px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 50px;
}

.stat {
  padding: 32px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-num {
  display: block;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 12px;
}

.stat-label {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.5;
}

.problem-detail {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 800px;
  line-height: 1.75;
}

/* ===== FEATURES ===== */
.features {
  padding: 100px 40px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.features h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 50px;
}

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

.feature-card {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.3s ease;
}

.feature-card:hover {
  border-color: var(--border-accent);
}

.feature-large {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 212, 170, 0.04) 100%);
  border-color: var(--border-accent);
}

.feature-icon {
  font-size: 28px;
  margin-bottom: 16px;
  filter: grayscale(0.2);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== HOW IT WORKS ===== */
.how {
  padding: 100px 40px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.how h2 {
  max-width: var(--max-width);
  margin: 0 auto 60px;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.how .overline {
  max-width: var(--max-width);
  margin: 0 auto 20px;
}

.steps {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

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

.step-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  padding-top: 4px;
  flex-shrink: 0;
  width: 40px;
}

.step-content h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.step-content p {
  font-size: 16px;
  color: var(--fg-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* ===== CLOSING ===== */
.closing {
  padding: 120px 40px;
  text-align: center;
}

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

.closing h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.closing p {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
footer {
  padding: 48px 40px;
  border-top: 1px solid var(--border);
}

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

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-dim);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero { padding: 80px 24px 60px; min-height: 70vh; }
  .problem, .features, .how, .closing { padding: 60px 24px; }
  .stats-row { grid-template-columns: 1fr; gap: 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .feature-large { grid-column: 1; }
  .step { flex-direction: column; gap: 12px; }
  .helix-visual { display: none; }
  footer { padding: 32px 24px; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 36px; }
  .stat-num { font-size: 36px; }
  .stat { padding: 24px; }
  .feature-card { padding: 24px; }
}