:root {
  color-scheme: light;
  --page: #faf9f7;
  --panel: #ffffff;
  --surface-subtle: #f1efea;
  --ink: #1a1a18;
  --body: #55534f;
  --muted: #706d67;
  --border: #e5e2db;
  --accent: #2e6b5c;
  --accent-strong: #2e6b5c;
  --dark: #1d1d1a;
  --on-dark: #f5f3ee;
  --on-dark-muted: #c7c4bd;
  --device-border: #3a3a35;
  --device-frame: #0f100e;
  --device-shadow: #00000052;
  --focus: #84a794;
  --radius-small: 12px;
  --radius-medium: 24px;
  --radius-large: 40px;
  --shell: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; }

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

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.shell {
  width: min(calc(100% - 48px), var(--shell));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  inset: 12px auto auto 12px;
  z-index: 100;
  padding: 12px 16px;
  border-radius: var(--radius-small);
  background: var(--ink);
  color: var(--panel);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 84%, transparent);
  background: color-mix(in srgb, var(--page) 90%, transparent);
  backdrop-filter: blur(16px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  font-weight: 650;
}

.brand img { border-radius: 11px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--body);
  font-size: 14px;
}

.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color 180ms ease;
}

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

.availability {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 650;
}

.hero {
  min-height: calc(100dvh - 72px);
  padding-block: 72px 96px;
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(420px, 1.14fr);
  align-items: center;
  gap: 72px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font: 700 11px/1.5 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.14em;
}

h1, h2, h3, p { overflow-wrap: break-word; }

h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(52px, 7.2vw, 104px);
  font-weight: 330;
  line-height: 1.06;
}

.hero-intro {
  max-width: 580px;
  margin: 32px 0 0;
  color: var(--body);
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.primary-link {
  min-height: 48px;
  padding-inline: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-small);
  background: var(--ink);
  color: var(--panel);
  font-size: 15px;
  font-weight: 650;
  transition: background-color 180ms ease, transform 180ms ease;
}

.primary-link:hover { background: var(--accent-strong); }
.primary-link:active { transform: scale(0.98); }

.release-note { color: var(--muted); font-size: 14px; }

.product-stage {
  min-height: 720px;
  padding: 32px 48px 0;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--radius-large);
  background: var(--dark);
}

.stage-caption {
  position: absolute;
  inset: 32px 40px auto;
  display: flex;
  justify-content: space-between;
  color: var(--on-dark-muted);
  font: 600 10px/1.5 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.12em;
}

.phone-frame {
  width: min(76%, 390px);
  padding: 10px;
  border: 1px solid var(--device-border);
  border-bottom: 0;
  border-radius: 52px 52px 0 0;
  background: var(--device-frame);
  box-shadow: 0 36px 80px var(--device-shadow);
  transform: rotate(1.25deg) translateY(24px);
  transform-origin: bottom center;
}

.phone-frame img {
  width: 100%;
  height: auto;
  border-radius: 42px 42px 0 0;
}

.principles {
  min-height: 104px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--border);
}

.principles p {
  margin: 0;
  display: grid;
  place-items: center;
  color: var(--body);
  font-size: 13px;
  text-align: center;
}

.principles p + p { border-left: 1px solid var(--border); }

.feature-section { padding-block: 144px; }

.section-heading {
  max-width: 760px;
  margin-bottom: 64px;
}

.section-heading h2,
.quiet-layout h2,
.closing h2 {
  margin: 0;
  font-size: clamp(40px, 5vw, 72px);
  font-weight: 350;
  line-height: 1.15;
}

.section-heading > p:last-child {
  margin: 20px 0 0;
  color: var(--body);
  font-size: 17px;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  min-height: 420px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: var(--panel);
}

.feature-card-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-dark);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.feature-icon svg {
  width: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-number {
  margin: auto 0 16px;
  color: var(--muted);
  font: 600 11px/1.5 ui-monospace, "SFMono-Regular", monospace;
}

.feature-card-primary .feature-number { color: var(--on-dark-muted); }

.feature-card h3 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
}

.feature-card > p:last-child {
  margin: 20px 0 0;
  color: var(--body);
  font-size: 15px;
  line-height: 1.85;
}

.feature-card-primary > p:last-child { color: var(--on-dark); }

.quiet-section {
  padding-block: 136px;
  background: var(--dark);
  color: var(--on-dark);
}

.quiet-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 96px;
  align-items: start;
}

.eyebrow-light { color: var(--focus); }

.privacy-copy > p {
  margin: 4px 0 0;
  color: var(--on-dark-muted);
  font-size: 17px;
  line-height: 1.9;
}

.privacy-facts {
  margin: 64px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.privacy-facts div {
  padding-top: 20px;
  border-top: 1px solid var(--device-border);
}

.privacy-facts dt { font-size: 28px; font-weight: 550; }
.privacy-facts dd { margin: 8px 0 0; color: var(--on-dark-muted); font-size: 12px; line-height: 1.5; }

.closing {
  padding-block: 144px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
}

.closing img { border-radius: 28px; }
.closing > div > p:last-child { margin: 20px 0 0; color: var(--body); font-size: 16px; }

.site-footer { border-top: 1px solid var(--border); }

.footer-layout {
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 12px;
}

.footer-layout p { margin: 0; }

.not-found { min-height: 100dvh; }
.not-found h1 { font-size: clamp(40px, 8vw, 80px); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { max-width: 720px; }
  .product-stage { min-height: 680px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 320px; }
  .quiet-layout { grid-template-columns: 1fr; gap: 56px; }
}

@media (max-width: 640px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  .nav { min-height: 64px; }
  .brand img { width: 36px; height: 36px; }
  .brand span { font-size: 15px; }
  .nav-links a { display: none; }
  .availability { font-size: 10px; }
  .hero { min-height: auto; padding-block: 64px 80px; }
  h1 { font-size: clamp(48px, 15vw, 72px); }
  .hero-intro { margin-top: 24px; font-size: 16px; }
  .product-stage { min-height: 560px; padding: 24px 20px 0; border-radius: var(--radius-medium); }
  .stage-caption { inset: 24px 24px auto; }
  .phone-frame { width: min(88%, 332px); }
  .principles { grid-template-columns: repeat(2, 1fr); }
  .principles p { min-height: 72px; }
  .principles p:nth-child(3) { border-left: 0; border-top: 1px solid var(--border); }
  .principles p:nth-child(4) { border-top: 1px solid var(--border); }
  .feature-section, .quiet-section, .closing { padding-block: 96px; }
  .section-heading { margin-bottom: 48px; }
  .feature-card { padding: 28px; }
  .privacy-facts { grid-template-columns: 1fr; gap: 28px; }
  .closing { flex-direction: column; text-align: center; gap: 32px; }
  .closing img { width: 96px; height: 96px; }
  .footer-layout { min-height: 120px; flex-direction: column; justify-content: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}