@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg-base: #060911;
  --bg-surface: #0e1424;
  --bg-surface-elevated: #162038;
  --bg-surface-glass: rgba(14, 20, 36, 0.75);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(6, 182, 212, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #06b6d4;
  --accent-teal: #14b8a6;
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;
  --accent-glow: 0 0 24px rgba(6, 182, 212, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* Background Atmosphere */
body::before {
  content: '';
  position: fixed;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(6, 182, 212, 0.12) 0%, rgba(99, 102, 241, 0.05) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Glassmorphic Nav */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--bg-surface-glass);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-badge img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

.version-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  border-radius: var(--radius-full);
  font-weight: 500;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.nav-links a {
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.lang-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.lang-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
}

.cta-nav {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  color: #fff;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
  transition: var(--transition-smooth);
}

.cta-nav:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.45);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 28px;
  background: #ffffff;
  color: #060911;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.15);
  transition: var(--transition-smooth);
}

.btn-appstore:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(255, 255, 255, 0.25);
  background: #f1f5f9;
}

.btn-appstore svg {
  width: 22px;
  height: 22px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.18);
}

/* Interactive Sleep Lab / Waveform Simulator */
.interactive-simulator {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), var(--accent-glow);
  max-width: 860px;
  margin: 0 auto 80px;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.sim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.sim-status {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-weight: 600;
}

.waveform-canvas-wrapper {
  background: #03050a;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 20px;
  margin-bottom: 24px;
  position: relative;
}

canvas#waveformCanvas {
  width: 100%;
  height: 140px;
  display: block;
}

.sim-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .sim-controls {
    grid-template-columns: 1fr;
  }
}

.control-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.control-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.threshold-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.trigger-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
}

.sim-btn {
  flex: 1;
  padding: 10px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.sim-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.sim-btn.active {
  background: rgba(6, 182, 212, 0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Features Matrix */
.section-heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 80px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition-smooth);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Privacy & Local-first Banner */
.privacy-banner {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(6, 182, 212, 0.05));
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-bottom: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.privacy-info h3 {
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 8px;
}

.privacy-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 620px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
  background: var(--bg-surface);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.footer-links-col h5 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.footer-links-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-col a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}