:root {
  --bg: #F8F6F1;
  --bg-alt: #EFECE5;
  --fg: #1A1816;
  --fg-muted: #6B6560;
  --accent: #0D9488;
  --accent-hover: #0B7C70;
  --gold: #D97706;
  --gold-light: #FEF3C7;
  --border: #DDD9D0;
  --surface: #FFFFFF;
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans: 'DM Sans', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.nav-badge {
  font-size: 12px;
  color: var(--fg-muted);
  background: var(--bg-alt);
  padding: 4px 10px;
  border-radius: 20px;
  font-family: var(--font-sans);
  font-weight: 500;
}

/* Hero */
.hero {
  padding: 80px 40px 100px;
}
.hero-grid {
  max-width: 1140px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 60px;
  align-items: start;
}
.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.65;
  max-width: 540px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.hero-note {
  font-size: 13px;
  color: var(--fg-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: white;
  border: none;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { border-color: var(--fg-muted); }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: white; }

/* Stats */
.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.stat-label {
  font-size: 12px;
  color: var(--fg-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.stat-value {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--fg);
  line-height: 1;
}

/* Section labels */
.section-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 16px;
}
.section-sub {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.65;
  max-width: 580px;
}

/* How it works */
.hiw {
  background: var(--bg-alt);
  padding: 80px 40px;
}
.hiw-inner {
  max-width: 1140px;
  margin: 0 auto;
}
.hiw-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 48px;
}
.step-num {
  font-family: var(--font-serif);
  font-size: 48px;
  color: var(--accent);
  display: block;
  margin-bottom: 16px;
  line-height: 1;
}
.step h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--fg);
  margin-bottom: 10px;
  line-height: 1.3;
}
.step p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* Use cases */
.usecases {
  padding: 80px 40px;
}
.usecases-inner {
  max-width: 1140px;
  margin: 0 auto;
}
.uc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.uc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
}
.uc-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-alt);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent);
}
.uc-card h3 {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--fg);
  margin-bottom: 10px;
  line-height: 1.35;
}
.uc-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* Validation */
.validation {
  background: var(--fg);
  color: white;
  padding: 80px 40px;
}
.val-inner {
  max-width: 1140px;
  margin: 0 auto;
}
.val-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.val-content .section-label { color: var(--gold); }
.val-content .section-title { color: white; }
.val-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.65);
  line-height: 1.65;
  margin-bottom: 36px;
}
.val-benchmarks {
  display: flex;
  gap: 40px;
  margin-bottom: 24px;
}
.bench { display: flex; flex-direction: column; gap: 4px; }
.bench-value {
  font-family: var(--font-serif);
  font-size: 36px;
  color: white;
  line-height: 1;
}
.bench-label {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.val-link {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  text-decoration: none;
}
.val-link:hover { color: white; }
.val-feature {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  padding: 32px;
}
.feature-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(217, 119, 6, 0.15);
  color: var(--gold);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 20px;
  margin-bottom: 16px;
}
.val-feature h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: white;
  margin-bottom: 10px;
  line-height: 1.3;
}
.val-feature p {
  font-size: 15px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

/* Closing */
.closing {
  padding: 80px 40px;
}
.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.closing-headline {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 48px);
  color: var(--fg);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.closing-body {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 40px;
}
.closing-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px;
}
.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--fg);
}
.footer p {
  font-size: 13px;
  color: var(--fg-muted);
  margin-top: 4px;
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 14px;
  color: var(--fg-muted);
  text-decoration: none;
}
.footer-links a:hover { color: var(--fg); }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
  .hiw-steps { grid-template-columns: 1fr; gap: 32px; }
  .uc-grid { grid-template-columns: repeat(2, 1fr); }
  .val-grid { grid-template-columns: 1fr; }
  .nav { padding: 16px 24px; }
  .hero { padding: 60px 24px 80px; }
  .hiw, .usecases, .validation, .closing { padding: 60px 24px; }
  .footer { padding: 32px 24px; }
}
@media (max-width: 600px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .uc-grid { grid-template-columns: 1fr; }
  .val-benchmarks { gap: 24px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}