:root {
  color-scheme: light;
  --ink: #171918;
  --muted: #616762;
  --line: rgba(23, 25, 24, 0.12);
  --surface: rgba(255, 255, 255, 0.78);
  --accent: #176b4a;
  --accent-strong: #0e4d35;
  --accent-soft: #dff3e9;
  --page: #f4f6f1;
  --display: "Arial Rounded MT Bold", "Microsoft YaHei", system-ui, sans-serif;
  --body: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% 8%, color-mix(in srgb, var(--accent-soft) 82%, white), transparent 27rem),
    linear-gradient(180deg, #fbfcf9 0%, var(--page) 72%, #eef1eb 100%);
  font: 16px/1.65 var(--body);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 16px; background: var(--ink); color: white; border-radius: 999px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, #fbfcf9 84%, transparent);
  backdrop-filter: blur(18px);
}
.header-inner { min-height: 72px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand img { width: 38px; height: 38px; border-radius: 11px; object-fit: cover; box-shadow: 0 5px 16px rgba(18, 22, 19, .12); }
.brand small { display: block; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 26px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 650; }
.nav a:hover { color: var(--ink); }
.header-action { margin-left: 4px; }

.button {
  min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 0 21px; border: 1px solid transparent; border-radius: 14px;
  font-weight: 760; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--accent); box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 24%, transparent); }
.button-primary:hover { background: var(--accent-strong); }
.button-secondary { border-color: var(--line); background: rgba(255,255,255,.72); }
.button-secondary:hover { background: white; box-shadow: 0 10px 24px rgba(18, 22, 19, .08); }
.button-disabled { color: var(--muted); border-color: var(--line); background: rgba(255,255,255,.5); cursor: not-allowed; }
.button-disabled:hover { transform: none; }

.hero { min-height: 690px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 70px; padding-block: 86px 74px; }
.eyebrow { margin: 0 0 18px; color: var(--accent); font-size: 12px; font-weight: 850; letter-spacing: .15em; text-transform: uppercase; }
.hero h1 { max-width: 760px; margin: 0; font: 850 clamp(48px, 6.5vw, 86px)/1.02 var(--display); letter-spacing: -.065em; text-wrap: balance; }
.hero-lead { max-width: 620px; margin: 26px 0 0; color: var(--muted); font-size: clamp(18px, 2vw, 22px); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.release-note { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 22px; color: var(--muted); font-size: 13px; }
.release-note span { display: inline-flex; align-items: center; gap: 7px; }
.release-note span::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

.hero-visual { position: relative; min-height: 520px; display: grid; place-items: center; }
.visual-halo { position: absolute; inset: 6% 2%; border-radius: 42% 58% 54% 46% / 49% 42% 58% 51%; background: color-mix(in srgb, var(--accent-soft) 76%, white); filter: drop-shadow(0 30px 70px color-mix(in srgb, var(--accent) 16%, transparent)); transform: rotate(-7deg); }
.app-icon { position: relative; z-index: 2; width: min(310px, 70vw); aspect-ratio: 1; border-radius: 27%; object-fit: cover; box-shadow: 0 34px 70px rgba(20, 24, 21, .19); }
.signal { position: absolute; z-index: 3; max-width: 210px; padding: 12px 16px; border: 1px solid rgba(255,255,255,.72); border-radius: 16px; background: rgba(255,255,255,.84); box-shadow: 0 14px 34px rgba(18,22,19,.12); backdrop-filter: blur(14px); font-size: 13px; font-weight: 740; }
.signal-one { top: 15%; left: 0; }
.signal-two { right: 0; bottom: 16%; }
.signal small { display: block; color: var(--muted); font-weight: 550; }

.proof { padding-block: 18px 82px; }
.proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: 24px; background: var(--surface); overflow: hidden; }
.proof-item { padding: 26px 30px; }
.proof-item + .proof-item { border-left: 1px solid var(--line); }
.proof-item strong { display: block; font: 800 21px/1.25 var(--display); letter-spacing: -.025em; }
.proof-item span { color: var(--muted); font-size: 13px; }

.section { padding-block: 100px; }
.section-tinted { border-block: 1px solid var(--line); background: rgba(255,255,255,.48); }
.section-heading { max-width: 720px; margin-bottom: 46px; }
.section-heading h2 { margin: 0; font: 830 clamp(34px, 4.6vw, 56px)/1.1 var(--display); letter-spacing: -.05em; text-wrap: balance; }
.section-heading p:last-child { margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { min-height: 270px; padding: 30px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); }
.feature-icon { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 48px; border-radius: 15px; color: var(--accent); background: var(--accent-soft); font-size: 22px; font-weight: 900; }
.feature-card h3 { margin: 0; font: 790 22px/1.3 var(--display); letter-spacing: -.025em; }
.feature-card p { margin: 12px 0 0; color: var(--muted); }

.steps { counter-reset: steps; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step { counter-increment: steps; padding: 28px 0; border-top: 1px solid var(--line); }
.step::before { content: "0" counter(steps); display: block; margin-bottom: 22px; color: var(--accent); font-weight: 850; letter-spacing: .12em; }
.step h3 { margin: 0; font: 780 21px/1.3 var(--display); }
.step p { margin: 10px 0 0; color: var(--muted); }

.download-panel { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; padding: clamp(32px, 5vw, 62px); border-radius: 32px; color: white; background: var(--ink); overflow: hidden; position: relative; }
.download-panel::after { content: ""; position: absolute; width: 360px; height: 360px; right: -130px; bottom: -230px; border-radius: 50%; background: var(--accent); opacity: .38; }
.download-panel h2 { position: relative; z-index: 1; margin: 0; font: 820 clamp(32px, 4vw, 50px)/1.1 var(--display); letter-spacing: -.045em; }
.download-panel p { position: relative; z-index: 1; max-width: 680px; margin: 14px 0 0; color: #c8cec9; }
.download-actions { position: relative; z-index: 1; display: flex; flex-direction: column; gap: 10px; min-width: 230px; }
.download-actions .button-primary { background: var(--accent); }
.download-actions .button-secondary { color: white; border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.08); }
.download-actions small { color: #aeb5af; text-align: center; }

.faq { display: grid; grid-template-columns: .75fr 1.25fr; gap: 80px; }
.faq h2 { margin: 0; font: 820 clamp(34px, 4vw, 52px)/1.1 var(--display); letter-spacing: -.045em; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { padding: 24px 36px 24px 0; cursor: pointer; list-style: none; position: relative; font-weight: 760; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 20px; color: var(--accent); font-size: 24px; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -8px 0 24px; color: var(--muted); }

.site-footer { padding-block: 30px 36px; border-top: 1px solid var(--line); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 13px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

.legal-main { padding-block: 78px 110px; }
.legal-hero { max-width: 820px; margin-bottom: 44px; }
.legal-hero h1 { margin: 0; font: 830 clamp(40px, 6vw, 70px)/1.06 var(--display); letter-spacing: -.055em; }
.legal-hero > p:last-child { color: var(--muted); }
.legal-card { max-width: 860px; padding: clamp(26px, 5vw, 58px); border: 1px solid var(--line); border-radius: 28px; background: var(--surface); }
.legal-card > p:first-child { margin-top: 0; font-size: 18px; }
.legal-section { padding-top: 24px; }
.legal-section + .legal-section { margin-top: 24px; border-top: 1px solid var(--line); }
.legal-section h2 { margin: 0 0 10px; font: 780 24px/1.3 var(--display); letter-spacing: -.025em; }
.legal-section p, .legal-section li { color: var(--muted); }
.legal-section code { padding: 2px 6px; border-radius: 6px; background: var(--accent-soft); color: var(--ink); }
.legal-section a { color: var(--accent-strong); font-weight: 700; }

@media (max-width: 900px) {
  .nav { display: none; }
  .header-action { margin-left: auto; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 28px; padding-block: 68px 48px; }
  .hero-copy { text-align: center; }
  .hero-lead { margin-inline: auto; }
  .hero-actions, .release-note { justify-content: center; }
  .hero-visual { min-height: 430px; }
  .proof-grid, .feature-grid, .steps { grid-template-columns: 1fr; }
  .proof-item + .proof-item { border-left: 0; border-top: 1px solid var(--line); }
  .feature-card { min-height: 0; }
  .feature-icon { margin-bottom: 34px; }
  .download-panel { grid-template-columns: 1fr; }
  .download-actions { min-width: 0; }
  .faq { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1160px); }
  .header-inner { min-height: 64px; }
  .brand small, .header-action { display: none; }
  .hero { padding-top: 54px; }
  .hero h1 { font-size: clamp(43px, 15vw, 62px); }
  .hero-visual { min-height: 350px; }
  .app-icon { width: 230px; }
  .signal { max-width: 165px; padding: 10px 12px; }
  .signal-one { top: 10%; }
  .signal-two { bottom: 8%; }
  .section { padding-block: 76px; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}

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