:root {
  --bg: #0c0c0e;
  --surface: #141416;
  --surface2: #1e1e22;
  --fg: #f4f4f0;
  --fg-muted: #8a8a8e;
  --accent: #ff4d00;
  --accent-dim: rgba(255, 77, 0, 0.12);
  --border: rgba(255,255,255,0.08);
  --font-display: 'Syne', sans-serif;
  --font-mono: 'DM Mono', monospace;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid var(--border);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand-mark { color: var(--accent); font-size: 20px; }
.nav-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 100px 48px 80px;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(42px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.6;
  max-width: 440px;
}

/* Phone mockup */
.phone-frame {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 32px;
  padding: 20px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
.phone-screen {
  background: #0a0a0c;
  border-radius: 20px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 300px;
}
.sms-bubble {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  padding: 10px 14px;
  border-radius: 16px;
  max-width: 85%;
}
.sms-bubble.missed {
  background: var(--accent-dim);
  color: #ff8c55;
  border: 1px solid rgba(255,77,0,0.2);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.sms-bubble.response {
  background: var(--surface2);
  color: var(--fg);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.sms-bubble.ai {
  background: rgba(255,77,0,0.08);
  color: #ffb899;
  border: 1px solid rgba(255,77,0,0.15);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.sms-time {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-muted);
  text-align: right;
  margin-top: 4px;
}

/* Problem */
.problem {
  padding: 80px 48px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 60px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}
.stat-number {
  font-size: clamp(56px, 8vw, 96px);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
}
.stat-label {
  font-size: 14px;
  color: var(--fg-muted);
  margin-top: 8px;
  line-height: 1.4;
}
.problem-quote blockquote {
  font-size: 18px;
  font-style: italic;
  color: var(--fg-muted);
  line-height: 1.5;
  max-width: 360px;
}
.problem-quote cite {
  display: block;
  font-size: 12px;
  color: #555;
  margin-top: 12px;
  font-style: normal;
  font-family: var(--font-mono);
}
.problem-math {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 32px;
  min-width: 280px;
}
.math-row {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
}
.math-row:last-child { border-bottom: none; }
.math-val { color: var(--fg); font-family: var(--font-mono); font-weight: 500; }
.math-total { padding-top: 16px; font-size: 15px; }
.math-high { color: var(--accent); font-weight: 600; font-size: 16px; }

/* How */
.how {
  padding: 100px 48px;
  max-width: 1200px;
  margin: 0 auto;
}
.section-header { margin-bottom: 60px; }
.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.steps {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}
.step {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
}
.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.step p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
}
.step-arrow {
  font-size: 28px;
  color: var(--fg-muted);
  padding-top: 80px;
  flex-shrink: 0;
}

/* Features */
.features {
  padding: 80px 48px 100px;
  border-top: 1px solid var(--border);
  max-width: 1200px;
  margin: 0 auto;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}
.feature {
  background: var(--surface);
  padding: 40px 32px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.feature:nth-child(3n) { border-right: none; }
.feature:nth-last-child(-n+3) { border-bottom: none; }
.feature-icon {
  font-size: 28px;
  margin-bottom: 16px;
  display: block;
}
.feature h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.feature p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* Closing */
.closing {
  padding: 100px 48px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg) 0%, rgba(255,77,0,0.03) 100%);
}
.closing-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}
.closing-stat { margin-bottom: 40px; }
.closing-num {
  font-size: clamp(64px, 10vw, 96px);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
}
.closing-num span {
  font-size: 0.45em;
  color: var(--fg-muted);
  font-weight: 500;
  vertical-align: super;
}
.closing-desc {
  font-size: 15px;
  color: var(--fg-muted);
  margin-top: 8px;
  font-family: var(--font-mono);
}
.closing h2 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
}
.closing-sub {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.6;
  margin-bottom: 32px;
}
.closing-proof {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 13px;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}
.proof-dot { color: var(--accent); }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
}
.footer-copy {
  font-size: 13px;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding: 60px 24px 48px; }
  .problem { grid-template-columns: 1fr; gap: 32px; padding: 60px 24px; }
  .steps { flex-direction: column; }
  .step-arrow { display: none; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature:nth-child(3n) { border-right: 1px solid var(--border); }
  .feature:nth-child(2n) { border-right: none; }
  .feature:nth-last-child(-n+3) { border-bottom: 1px solid var(--border); }
  .feature:nth-last-child(-n+2) { border-bottom: none; }
  nav, .how, .features, .closing, footer { padding-left: 24px; padding-right: 24px; }
}
@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature { border-right: none !important; border-bottom: 1px solid var(--border) !important; }
  .feature:last-child { border-bottom: none !important; }
  .hero h1 { font-size: 36px; }
  nav { padding: 20px 24px; }
  footer { flex-direction: column; gap: 12px; text-align: center; }
}