:root {
  --bg: #EBF0F8;
  --surface: #FFFFFF;
  --accent: #4A6BA6;
  --accent-strong: #34518A;
  --text-primary: #11151F;
  --text-secondary: #5B6172;
  --border: rgba(17, 21, 31, 0.08);
  --shadow: 0 10px 30px rgba(17, 21, 31, 0.08);
  --radius: 18px;
  --container: 1120px;
  --gutter: 24px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
          Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B1426;
    --surface: #1A2342;
    --accent: #85A3E0;
    --accent-strong: #A6BFEB;
    --text-primary: #F2F5FA;
    --text-secondary: #9BA2B4;
    --border: rgba(242, 245, 250, 0.10);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-strong); }

h1, h2, h3 {
  color: var(--text-primary);
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 600; }
h3 { font-size: 1.125rem; font-weight: 600; }
p  { margin: 0 0 1em; color: var(--text-secondary); }
p.lead { color: var(--text-primary); font-size: 1.125rem; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.15rem;
}
.brand:hover { color: var(--accent); }
.brand-mark { width: 28px; height: 28px; }
.brand span { color: var(--text-primary); }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--text-primary); }
@media (max-width: 540px) {
  .nav-links { gap: 16px; font-size: 0.9rem; }
}

/* ---------- hero ---------- */
.hero { padding: 64px 0 32px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
@media (min-width: 768px) {
  .hero { padding: 96px 0 64px; }
  .hero-grid { grid-template-columns: 1.05fr 0.95fr; gap: 56px; }
}
.hero-copy .lead {
  max-width: 36ch;
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 0.5em;
}
.hero-device { text-align: center; }
.hero-device img {
  width: min(80%, 320px);
  margin: 0 auto;
  border-radius: 36px;
  box-shadow: var(--shadow);
}
@media (min-width: 1024px) {
  .hero-device img { width: 340px; }
}

/* ---------- CTA buttons ---------- */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}
.btn-primary {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  padding: 8px 22px;
  min-height: 56px;
  border-radius: 14px;
  background: var(--text-primary);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn-primary:hover { color: var(--bg); transform: translateY(-1px); }
.btn-primary.disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  opacity: 0.8;
  line-height: 1.1;
}
.btn-title { font-size: 1.05rem; line-height: 1.1; }
.cta-note { color: var(--text-secondary); font-size: 0.9rem; }

/* ---------- features ---------- */
.features { padding: 80px 0; }
.features h2 { max-width: 22ch; }
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 40px;
}
@media (min-width: 640px) {
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .feature-grid { grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.feature h3 { margin-bottom: 6px; }
.feature p { margin: 0; font-size: 0.95rem; line-height: 1.5; }
.feature-mark {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  margin-bottom: 14px;
}

/* ---------- showcase ---------- */
.showcase { padding: 24px 0 64px; }
.showcase-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding: 48px 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 768px) {
  .showcase-row {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    padding: 72px 0;
  }
  .showcase-row.reverse > :first-child { order: 2; }
}
.showcase-copy h2 { max-width: 18ch; }
.showcase-device { text-align: center; }
.showcase-device img {
  width: min(70%, 300px);
  margin: 0 auto;
  border-radius: 32px;
  box-shadow: var(--shadow);
}

/* ---------- sounds ---------- */
.sounds {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.sounds .section-lead {
  max-width: 56ch;
  color: var(--text-secondary);
  font-size: 1.05rem;
}
.sound-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 36px;
}
@media (min-width: 540px) {
  .sound-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 960px) {
  .sound-grid { grid-template-columns: repeat(4, 1fr); }
}
.sound-cat h3 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 12px;
}
.sound-cat ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sound-cat li {
  padding: 6px 0;
  color: var(--text-primary);
  font-size: 0.98rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.sound-cat li:last-child { border-bottom: none; }

/* ---------- premium ---------- */
.premium { padding: 80px 0; }
.premium-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
@media (min-width: 768px) {
  .premium-grid { grid-template-columns: 1.15fr 0.85fr; gap: 56px; }
}
.premium-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.premium-list li {
  padding-left: 28px;
  position: relative;
  color: var(--text-secondary);
}
.premium-list li strong { color: var(--text-primary); }
.premium-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 2px solid var(--accent);
}
.premium-device { text-align: center; }
.premium-device img {
  width: min(70%, 280px);
  margin: 0 auto;
  border-radius: 32px;
  box-shadow: var(--shadow);
}

/* ---------- closing CTA ---------- */
.cta {
  padding: 80px 0 96px;
  text-align: center;
  border-top: 1px solid var(--border);
}
.cta h2 { max-width: 20ch; margin-left: auto; margin-right: auto; }
.cta p { margin-bottom: 24px; }
.cta .btn-primary {
  margin: 0 auto;
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand {
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
  font-size: 1rem;
}
.footer-tag { margin: 0; }
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.site-footer nav a { color: var(--text-secondary); }
.site-footer nav a:hover { color: var(--text-primary); }
.footer-fine {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-secondary);
}