:root {
  --bg: #0A0E17;
  --surface: #131A26;
  --surface-elevated: #1B2434;
  --primary: #38BDF8;
  --secondary: #2DD4BF;
  --health-good: #22C55E;
  --health-due: #F59E0B;
  --health-bad: #EF4444;
  --text: #E6EDF7;
  --text-muted: #8FA3BF;
  --border: #24304A;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 14, 23, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}

.brand img { width: 32px; height: 32px; border-radius: 8px; }

.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--text-muted); font-size: 14px; font-weight: 600; }
.site-nav a:hover, .site-nav a.active { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--secondary);
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.3);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.1;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}

.hero h1 .accent { color: var(--primary); }

.hero p.lead {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 32px;
}

.cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: default;
}

.btn-primary {
  background: var(--primary);
  color: #041420;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--primary); text-decoration: none; }

.btn[aria-disabled="true"] { opacity: 0.7; }

/* Sections */
section { padding: 64px 0; }
section.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-head h2 { font-size: clamp(24px, 3.2vw, 34px); margin: 0 0 12px; letter-spacing: -0.01em; }
.section-head p { color: var(--text-muted); margin: 0; font-size: 16px; }

/* Physics / why-different cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card .stat {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}

.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; color: var(--text-muted); font-size: 14px; }

/* Screens / mockups */
.screens-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  align-items: start;
}

.screen-block { text-align: center; }

.phone {
  width: 100%;
  max-width: 220px;
  margin: 0 auto 16px;
  aspect-ratio: 9 / 19.5;
  background: #000;
  border-radius: 32px;
  padding: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), inset 0 0 0 1px #2a3348;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--bg);
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 16px 14px;
  position: relative;
}

.phone-screen .app-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.phone-screen .big-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #041420;
  font-weight: 800;
  font-size: 13px;
  text-align: center;
  border-radius: 14px;
  padding: 16px 8px;
  margin: 6px 0 12px;
}

.phone-screen .freq-readout {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.phone-screen .freq-label {
  font-size: 9px;
  color: var(--text-muted);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.phone-screen .wave {
  height: 40px;
  margin-bottom: 12px;
}

.phone-screen .mini-card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.phone-screen .mini-card b { color: var(--text); font-size: 11px; }

.ring-wrap { display: flex; justify-content: center; margin: 8px 0 12px; }

.phone-screen .pro-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10.5px;
  color: var(--text);
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.phone-screen .pro-row:last-of-type { border-bottom: none; }
.phone-screen .pro-row .check { color: var(--health-good); font-weight: 800; }

.mockup-caption {
  font-size: 13px;
  color: var(--text-muted);
}
.mockup-caption strong { color: var(--text); display: block; margin-bottom: 2px; font-size: 14px; }

.mockup-note {
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 36px;
  font-style: italic;
}

/* Feature lists */
.feature-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-col {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.feature-col h3 {
  margin: 0 0 16px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.feature-col ul { list-style: none; margin: 0; padding: 0; }
.feature-col li {
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14.5px;
  display: flex;
  gap: 10px;
}
.feature-col li:last-child { border-bottom: none; }
.feature-col li .check { color: var(--health-good); font-weight: 800; flex-shrink: 0; }
.feature-col li .pro-check { color: var(--primary); font-weight: 800; flex-shrink: 0; }

/* Honesty callout */
.honesty {
  background: var(--surface-elevated);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  max-width: 760px;
  margin: 0 auto;
}
.honesty h2 { margin: 0 0 10px; font-size: 20px; color: var(--health-due); }
.honesty p { margin: 0; color: var(--text-muted); font-size: 15px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 13.5px;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  justify-content: space-between;
  align-items: center;
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--text); }

/* Legal pages */
.legal {
  padding: 56px 0 80px;
}
.legal .wrap { max-width: 760px; }
.legal h1 { font-size: clamp(28px, 4vw, 38px); margin-bottom: 6px; }
.legal .effective-date { color: var(--text-muted); font-size: 14px; margin-bottom: 40px; }
.legal h2 { font-size: 19px; margin: 36px 0 12px; color: var(--primary); }
.legal p, .legal li { color: var(--text-muted); font-size: 15px; }
.legal ul { padding-left: 20px; }
.legal strong { color: var(--text); }
.legal a { font-weight: 600; }

@media (max-width: 640px) {
  .site-nav { gap: 14px; }
  .site-nav a { font-size: 13px; }
  section { padding: 48px 0; }
}