:root {
  color-scheme: dark;
  --background: #090b14;
  --surface: rgba(25, 28, 48, 0.72);
  --surface-solid: #15182a;
  --line: rgba(255, 255, 255, 0.11);
  --text: #f7f7fb;
  --muted: #aaaec4;
  --accent: #a99cff;
  --accent-strong: #7d6cff;
  --teal: #62e6ca;
  --content: 1180px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 50% -10%, rgba(82, 66, 185, 0.2), transparent 38rem),
    var(--background);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
[data-en] { display: none; }
html[data-language="en"] [data-zh] { display: none; }
html[data-language="en"] [data-en] { display: inline; }
p[data-en], html[data-language="en"] p[data-en] { display: none; }
html[data-language="en"] p[data-en] { display: block; }

.ambient {
  position: fixed;
  width: 26rem;
  height: 26rem;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.18;
  pointer-events: none;
  z-index: -1;
}
.ambient-one { top: 9rem; right: -11rem; background: var(--accent-strong); }
.ambient-two { top: 44rem; left: -15rem; background: var(--teal); }

.site-header,
main,
footer {
  width: min(calc(100% - 40px), var(--content));
  margin-inline: auto;
}

.site-header {
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 750; letter-spacing: -0.02em; }
.brand img { border-radius: 11px; }
nav { display: flex; align-items: center; gap: 26px; color: var(--muted); font-size: 0.93rem; }
nav a:hover { color: var(--text); }
.language-toggle {
  min-width: 52px;
  padding: 7px 12px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}
.language-toggle:hover { border-color: rgba(255, 255, 255, 0.28); }

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: center;
  gap: 74px;
  padding: 86px 0 72px;
}
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 0.82rem; font-weight: 650; letter-spacing: 0.04em; text-transform: uppercase; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 16px var(--teal); }
h1 { margin: 20px 0 22px; font-size: clamp(3.2rem, 6vw, 5.8rem); line-height: 0.98; letter-spacing: -0.065em; }
h1 em { color: var(--accent); font-style: normal; }
.hero-description { max-width: 620px; margin: 0; color: var(--muted); font-size: 1.12rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 34px; }
.button { min-height: 52px; padding: 0 22px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; border-radius: 14px; font-weight: 720; transition: transform 160ms ease, border-color 160ms ease, background 160ms ease; }
.button:hover { transform: translateY(-2px); }
.button svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.button-primary { color: #0b0d17; background: linear-gradient(135deg, #c7bfff, #8f81ff); box-shadow: 0 12px 34px rgba(112, 91, 255, 0.24); }
.button-secondary { border: 1px solid var(--line); background: rgba(255, 255, 255, 0.045); }
.release-meta { display: flex; flex-wrap: wrap; gap: 0; margin-top: 22px; color: #81869e; font-size: 0.78rem; }
.release-meta span:not(:last-child)::after { content: "·"; margin: 0 9px; }

.hero-visual { position: relative; display: grid; place-items: center; min-height: 580px; }
.hero-visual::before { content: ""; position: absolute; width: 360px; height: 360px; border-radius: 50%; background: rgba(123, 105, 255, 0.2); filter: blur(80px); }
.phone-frame { position: relative; z-index: 1; width: min(315px, 70vw); padding: 8px; background: #262a3e; border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 39px; box-shadow: 0 48px 100px rgba(0, 0, 0, 0.48), inset 0 0 0 1px rgba(0, 0, 0, 0.7); transform: rotate(2deg); }
.phone-frame img { border-radius: 31px; }
.phone-frame img[data-en] { display: none; }
html[data-language="en"] .phone-frame img[data-zh] { display: none; }
html[data-language="en"] .phone-frame img[data-en] { display: block; }
.mode-card { position: absolute; z-index: 2; min-width: 104px; padding: 13px 18px; border: 1px solid rgba(255, 255, 255, 0.15); border-radius: 15px; backdrop-filter: blur(16px); font-size: 0.86rem; font-weight: 720; box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3); }
.mode-card-light { top: 92px; left: 8px; color: #23253a; background: rgba(247, 239, 225, 0.9); transform: rotate(-7deg); }
.mode-card-dark { right: 0; bottom: 84px; background: rgba(31, 34, 56, 0.9); transform: rotate(7deg); }

.trust-strip { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line); }
.trust-strip div { padding: 26px 30px; display: grid; gap: 2px; }
.trust-strip div:not(:last-child) { border-right: 1px solid var(--line); }
.trust-strip strong { font-size: 0.95rem; }
.trust-strip span { color: var(--muted); font-size: 0.8rem; }

.section { padding: 126px 0 24px; }
.section-heading { display: grid; grid-template-columns: 52px 1fr; gap: 24px; align-items: start; margin-bottom: 48px; }
.section-kicker { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.78rem; }
h2 { margin: -9px 0 7px; font-size: clamp(2.1rem, 4vw, 3.7rem); line-height: 1.1; letter-spacing: -0.05em; }
.section-heading p { margin: 0; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-card { min-height: 240px; padding: 27px; border: 1px solid var(--line); border-radius: 22px; background: linear-gradient(145deg, rgba(29, 32, 52, 0.72), rgba(13, 15, 26, 0.62)); }
.feature-number { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.72rem; }
.feature-card h3 { margin: 68px 0 8px; font-size: 1.24rem; }
.feature-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.showcase-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 820px; margin: 0 auto; }
.showcase figure { margin: 0; padding: 10px; border: 1px solid var(--line); border-radius: 28px; background: var(--surface); }
.showcase figure img { border-radius: 20px; }
.showcase figcaption { padding: 16px 10px 8px; color: var(--muted); text-align: center; font-size: 0.86rem; }

.install-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.install-list li { display: grid; grid-template-columns: 50px 1fr; gap: 25px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.step { width: 38px; height: 38px; display: grid; place-items: center; color: var(--accent); border: 1px solid var(--line); border-radius: 50%; font-size: 0.8rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.install-list strong { font-size: 1.05rem; }
.install-list p { margin: 4px 0 0; color: var(--muted); font-size: 0.9rem; }
.download-card { margin-top: 40px; padding: 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid rgba(169, 156, 255, 0.28); border-radius: 24px; background: linear-gradient(130deg, rgba(90, 72, 186, 0.22), rgba(31, 34, 52, 0.54)); }
.download-card > div { display: grid; gap: 5px; }
.download-card strong { font-size: 1.35rem; }
.download-label, .checksum-link { color: var(--muted); font-size: 0.8rem; }
.checksum-link:hover { color: var(--text); }

footer { margin-top: 120px; padding: 34px 0 45px; display: flex; align-items: center; justify-content: space-between; gap: 30px; border-top: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 11px; }
.footer-brand img { border-radius: 9px; }
.footer-brand div { display: grid; line-height: 1.35; }
.footer-brand span { color: var(--muted); font-size: 0.72rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; color: var(--muted); font-size: 0.83rem; }
.footer-links a:hover { color: var(--text); }

.policy-page { max-width: 980px; padding-top: 100px; }
.policy-page h1 { max-width: 900px; font-size: clamp(3rem, 7vw, 5.4rem); }
.policy-lead { max-width: 760px; color: var(--muted); font-size: 1.16rem; }
.policy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 64px; }
.policy-grid section { padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.policy-grid h2 { margin: 0 0 12px; font-size: 1.2rem; letter-spacing: -0.02em; }
.policy-grid p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.policy-updated { margin-top: 36px; color: #7f849b; font-size: 0.78rem; }

@media (max-width: 850px) {
  .site-header { height: 72px; }
  nav a { display: none; }
  .hero { grid-template-columns: 1fr; gap: 42px; padding-top: 64px; }
  .hero-copy { text-align: center; }
  .eyebrow, .hero-actions, .release-meta { justify-content: center; }
  .hero-description { margin-inline: auto; }
  .hero-visual { min-height: 530px; }
  .trust-strip { grid-template-columns: 1fr; }
  .trust-strip div:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 190px; }
  .feature-card h3 { margin-top: 38px; }
}

@media (max-width: 600px) {
  .site-header, main, footer { width: min(calc(100% - 28px), var(--content)); }
  .brand span { font-size: 0.9rem; }
  h1 { font-size: clamp(2.8rem, 14vw, 4.2rem); }
  .hero { min-height: auto; padding-top: 52px; }
  .mode-card-light { left: -4px; }
  .mode-card-dark { right: -4px; }
  .section { padding-top: 96px; }
  .section-heading { grid-template-columns: 1fr; gap: 12px; }
  .showcase-grid { gap: 9px; }
  .showcase figure { padding: 5px; border-radius: 19px; }
  .showcase figure img { border-radius: 14px; }
  .download-card, footer { align-items: stretch; flex-direction: column; }
  .download-card .button { width: 100%; }
  .policy-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}