:root {
  color-scheme: dark;
  --bg: #080b12;
  --surface: rgba(21, 27, 40, 0.78);
  --surface-strong: #171d2a;
  --line: rgba(255, 255, 255, 0.11);
  --text: #f6f7fb;
  --muted: #a8b0c1;
  --accent: #62dcff;
  --accent-2: #8f7cff;
  --positive: #78e6aa;
  --max: 1120px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 8% -8%, rgba(143, 124, 255, 0.22), transparent 35rem),
    radial-gradient(circle at 92% 16%, rgba(98, 220, 255, 0.14), transparent 32rem),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; }
a:hover { color: var(--accent); }
img, svg { max-width: 100%; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .7rem 1rem;
  border-radius: .7rem;
  background: white;
  color: #080b12;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(8, 11, 18, .82);
  backdrop-filter: blur(20px) saturate(140%);
}

.nav {
  width: min(calc(100% - 2rem), var(--max));
  min-height: 4.25rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-weight: 760;
  text-decoration: none;
  letter-spacing: -.02em;
}

.roll-mark {
  position: relative;
  width: 2rem;
  height: 2rem;
  border-radius: .65rem;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  box-shadow: 0 .6rem 1.8rem rgba(98, 220, 255, .18);
}
.roll-mark::before,
.roll-mark::after {
  content: "";
  position: absolute;
  inset: .45rem .63rem;
  border-left: 2px solid rgba(4, 8, 16, .82);
  border-right: 2px solid rgba(4, 8, 16, .82);
  border-radius: 999px;
}
.roll-mark::after { inset: .74rem .34rem; border-width: 0 0 2px; }

.nav-links { display: flex; align-items: center; gap: 1.15rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .92rem; }
.nav-links a:hover { color: var(--text); }
.language {
  padding: .36rem .62rem;
  border: 1px solid var(--line);
  border-radius: .55rem;
}
.locale-switcher {
  width: min(calc(100% - 2rem), var(--max));
  margin: -.55rem auto .55rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: .35rem .75rem;
}
.locale-switcher a { color: var(--muted); font-size: .76rem; text-decoration: none; }
.locale-switcher a:hover { color: var(--text); }

main, .footer-inner { width: min(calc(100% - 2rem), var(--max)); margin: 0 auto; }
section { padding: 6.5rem 0; border-bottom: 1px solid var(--line); }

.hero {
  min-height: min(780px, calc(100vh - 4.25rem));
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, .95fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 6rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  color: var(--accent);
  font-size: .8rem;
  font-weight: 720;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 1.5rem; height: 1px; background: currentColor; }

h1, h2, h3 { line-height: 1.08; letter-spacing: -.035em; }
h1 { margin: 1rem 0 1.3rem; font-size: clamp(3.35rem, 8vw, 7.3rem); }
h2 { margin: 0 0 1.1rem; font-size: clamp(2.2rem, 5vw, 4.4rem); }
h3 { margin: 0 0 .65rem; font-size: 1.28rem; }
.hero p, .section-lead { max-width: 44rem; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 2.9rem;
  padding: .72rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: .8rem;
  background: rgba(255, 255, 255, .05);
  color: var(--text);
  font-weight: 680;
  text-decoration: none;
}
.button.primary { background: var(--text); color: #0a0d14; border-color: transparent; }
.button:hover { transform: translateY(-1px); color: inherit; border-color: rgba(255,255,255,.28); }
.button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

.device {
  width: min(100%, 29rem);
  margin-left: auto;
  padding: .8rem;
  border: 1px solid rgba(255,255,255,.17);
  border-radius: 2.1rem;
  background: rgba(255,255,255,.035);
  box-shadow: 0 2.5rem 8rem rgba(0,0,0,.45);
  transform: rotate(2deg);
}
.device-panel { padding: 1.35rem; border-radius: 1.45rem; background: #111622; }
.panel-title { display: flex; justify-content: space-between; align-items: center; font-weight: 700; }
.switch { width: 2.8rem; height: 1.6rem; padding: .2rem; border-radius: 2rem; background: #36c977; }
.switch::after { content: ""; display: block; width: 1.2rem; height: 1.2rem; margin-left: 1.2rem; border-radius: 50%; background: white; }
.wave { height: .3rem; margin: 1.5rem 0; border-radius: 1rem; background: linear-gradient(90deg, var(--accent), var(--accent-2) 68%, #283044 68%); }
.sound-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; }
.sound-chip { padding: .85rem; border: 1px solid var(--line); border-radius: .85rem; color: var(--muted); background: rgba(255,255,255,.025); }
.sound-chip.active { color: var(--text); border-color: rgba(98,220,255,.45); background: rgba(98,220,255,.08); }
.sound-chip b { display: block; color: inherit; }

.demo { display: grid; grid-template-columns: minmax(0, .8fr) minmax(18rem, 1.2fr); gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.demo-note, .demo-instructions, .demo-status { color: var(--muted); }
.demo-note { max-width: 44rem; }
.demo-panel { padding: 1.25rem; border: 1px solid var(--line); border-radius: 1.25rem; background: var(--surface); }
.demo-controls, .demo-sounds { display: flex; flex-wrap: wrap; gap: .65rem; }
.demo-sounds { margin: 1rem 0; }
button { font: inherit; }
button:disabled { cursor: not-allowed; opacity: .55; }
.sound-choice { min-height: 2.5rem; padding: .55rem .85rem; border: 1px solid var(--line); border-radius: .7rem; background: rgba(255,255,255,.025); color: var(--muted); cursor: pointer; }
.sound-choice.active { border-color: rgba(98,220,255,.45); background: rgba(98,220,255,.08); color: var(--text); }
.sound-choice:focus-visible, .scroll-pad:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.scroll-pad { max-height: 13rem; overflow-y: auto; overscroll-behavior: contain; border: 1px solid var(--line); border-radius: .9rem; background: #111622; }
.scroll-pad-content { min-height: 28rem; padding: 1rem; display: grid; align-content: space-between; color: var(--accent); font: 700 .82rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.demo-instructions { margin: .85rem 0 .25rem; font-size: .9rem; }
.demo-status { min-height: 1.6rem; margin: 0; font-size: .9rem; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2.4rem; }
.card {
  min-height: 13rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: linear-gradient(145deg, rgba(255,255,255,.055), rgba(255,255,255,.018));
}
.card p { margin-bottom: 0; color: var(--muted); }
.number { color: var(--accent); font: 700 .82rem ui-monospace, SFMono-Regular, Menlo, monospace; }

.split { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.definition { display: grid; gap: 1rem; }
.definition article { padding: 1.2rem 0; border-top: 1px solid var(--line); }
.definition p { color: var(--muted); margin-bottom: 0; }

.status-note {
  padding: 1rem 1.15rem;
  border: 1px solid rgba(120, 230, 170, .32);
  border-radius: .9rem;
  color: #c7f8dc;
  background: rgba(120, 230, 170, .07);
}

.legal { max-width: 780px; padding: 5rem 0 7rem; }
.legal h1 { font-size: clamp(2.6rem, 7vw, 4.7rem); }
.legal h2 { margin-top: 3rem; font-size: 1.65rem; }
.legal p, .legal li { color: var(--muted); }
.legal strong { color: var(--text); }
.draft {
  padding: 1rem;
  border: 1px solid rgba(255, 199, 92, .4);
  border-radius: .8rem;
  color: #ffe2a9;
  background: rgba(255, 199, 92, .08);
}

.site-footer { padding: 2.2rem 0 3.2rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 2rem; color: var(--muted); font-size: .88rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }

@media (max-width: 800px) {
  .nav-links a:not(.language) { display: none; }
  .hero, .split, .demo { grid-template-columns: 1fr; }
  .hero { padding-top: 4rem; }
  .device { margin: 0 auto; transform: none; }
  .grid { grid-template-columns: 1fr; }
  section { padding: 4.5rem 0; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .button:hover { transform: none; }
}