:root {
  --paper: #f8f3e9;
  --paper-clean: #fffdf8;
  --sage: #405f55;
  --sage-deep: #203b34;
  --ink: #202c2a;
  --stone: #68716d;
  --line: #d9d2c4;
  --gold: #c99735;
  --red: #a64a3b;
  --shadow: 0 24px 70px rgba(39, 49, 45, 0.13);
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  --utility: "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  opacity: .2;
  background-image: radial-gradient(circle at 20% 30%, rgba(64, 95, 85, .09) 0 .7px, transparent .9px);
  background-size: 9px 11px;
}
a { color: inherit; }
button, select { font: inherit; }
button { color: inherit; }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 16px;
  color: white;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(248, 243, 233, .9);
  border-bottom: 1px solid rgba(64, 95, 85, .12);
  backdrop-filter: blur(18px);
}
.nav-shell {
  width: min(1180px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 30px;
}
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--paper-clean);
  background: var(--sage);
  border: 1px solid var(--sage-deep);
  border-radius: 10px 10px 14px 10px;
  box-shadow: inset -6px -6px 0 rgba(255, 255, 255, .12);
  font-family: var(--display);
  font-size: 17px;
  line-height: 1;
}
.brand-name { font-family: var(--display); font-size: 25px; font-weight: 700; letter-spacing: .08em; }
.nav-links { justify-self: center; display: flex; gap: 28px; }
.nav-links a { padding: 6px 0; font-size: 14px; font-weight: 650; text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--sage); border-bottom: 1px solid var(--gold); }
.language-picker { display: flex; align-items: center; gap: 8px; }
.language-picker::before { content: "文"; color: var(--sage); font-family: var(--display); font-weight: 700; }
.language-picker select { min-height: 40px; border: 0; background: transparent; cursor: pointer; }
.menu-toggle { display: none; min-width: 44px; min-height: 44px; border: 0; background: transparent; }
.menu-toggle span:not(.sr-only) { width: 22px; height: 2px; display: block; margin: 5px auto; background: var(--ink); }

.section-shell { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 108px 0; }
.eyebrow { margin: 0 0 14px; color: var(--sage); font-family: var(--utility); font-size: 12px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
.section-heading { max-width: 720px; margin-bottom: 52px; }
.section-heading h2, .privacy-band h2, .availability-card h2, .plan-card h2, .content-hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(38px, 4vw, 58px);
  line-height: 1.18;
  letter-spacing: -.035em;
}
.section-heading > p:last-child, .lead { color: var(--stone); font-size: 17px; }

.hero {
  width: min(1240px, calc(100% - 48px));
  min-height: 730px;
  margin: 0 auto;
  padding: 80px 0 105px;
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  align-items: center;
  gap: 5vw;
}
.hero h1 { margin: 0; font-family: var(--display); font-size: clamp(58px, 6vw, 92px); line-height: 1.1; letter-spacing: -.045em; }
.hero h1 span { white-space: nowrap; }
.hero h1 em { color: var(--sage); font-style: normal; }
.hero-lead { max-width: 560px; margin: 30px 0 0; color: var(--stone); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { min-height: 50px; padding: 12px 22px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 14px; text-decoration: none; font-weight: 700; }
.button-primary { color: white; background: var(--sage); box-shadow: 0 10px 24px rgba(64, 95, 85, .2); }
.button-secondary { border-color: var(--line); background: rgba(255, 253, 248, .68); }
.button-disabled { color: #7f8783; background: #e8e5dd; border-color: #d7d3ca; cursor: not-allowed; }
.trust-list { padding: 0; margin: 30px 0 0; display: flex; flex-wrap: wrap; gap: 18px; color: var(--stone); font-size: 13px; list-style: none; }
.trust-list li::before { content: ""; width: 6px; height: 6px; display: inline-block; margin-right: 8px; border-radius: 50%; background: var(--gold); vertical-align: 1px; }

.hero-visual { position: relative; min-height: 620px; display: grid; place-items: center; perspective: 1200px; }
.scroll-sheet { width: min(430px, 72%); margin: 0; position: relative; z-index: 3; padding: 13px; background: var(--paper-clean); border: 1px solid rgba(64, 95, 85, .2); border-radius: 30px 30px 48px 30px; box-shadow: var(--shadow); transform: rotate(2.5deg); animation: settle 850ms cubic-bezier(.2, .7, .2, 1) both; }
.scroll-sheet img { width: 100%; border-radius: 20px 20px 38px 20px; aspect-ratio: 941 / 1672; object-fit: cover; }
.scroll-sheet::after { content: ""; position: absolute; width: 82px; height: 82px; right: 1px; bottom: 1px; border-radius: 82px 0 40px 0; background: linear-gradient(135deg, #d7cdbb 0 48%, var(--paper-clean) 50%); box-shadow: -12px -10px 20px rgba(35, 62, 55, .12); }
.file-tab { position: absolute; width: 65%; height: 72%; border: 1px solid rgba(64, 95, 85, .22); border-radius: 20px; box-shadow: 0 18px 50px rgba(39, 49, 45, .09); }
.file-tab::after { position: absolute; top: 36px; right: -1px; padding: 8px 13px; color: var(--sage-deep); background: #e8dfcd; border-radius: 10px 0 0 10px; font-family: var(--display); }
.file-tab-a { background: #e8e9df; transform: translate(-10%, 5%) rotate(-7deg); }
.file-tab-a::after { content: attr(data-label); }
.file-tab-b { background: #efe4cf; transform: translate(11%, -3%) rotate(8deg); }
.file-tab-b::after { content: attr(data-label); }
.seal { position: absolute; right: 2%; bottom: 11%; z-index: 4; width: 68px; height: 68px; display: grid; place-items: center; color: var(--red); border: 2px solid var(--red); border-radius: 13px; font-family: var(--display); font-weight: 700; transform: rotate(-8deg); }
@keyframes settle { from { opacity: 0; transform: translateY(34px) rotate(6deg); } to { opacity: 1; transform: translateY(0) rotate(2.5deg); } }

.index-layout { display: grid; grid-template-columns: 280px 1fr; gap: 44px; }
.index-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.feature-tab { width: 100%; min-height: 60px; padding: 18px 8px; display: grid; grid-template-columns: 42px 1fr; gap: 8px; align-items: center; text-align: left; color: var(--stone); border: 0; border-bottom: 1px solid var(--line); background: transparent; cursor: pointer; }
.feature-tab span { font-family: var(--utility); font-size: 11px; }
.feature-tab strong { font-size: 16px; }
.feature-tab[aria-selected="true"] { padding-left: 18px; color: var(--sage); }
.feature-tab[aria-selected="true"] span { color: var(--gold); }
.feature-stage { min-height: 630px; display: grid; grid-template-columns: .8fr 1.2fr; overflow: hidden; background: var(--paper-clean); border: 1px solid rgba(64, 95, 85, .14); border-radius: 28px; box-shadow: 0 20px 60px rgba(39, 49, 45, .08); }
.feature-copy { align-self: center; padding: 50px 8px 50px 46px; }
.feature-kicker { color: var(--gold); font-family: var(--utility); font-size: 11px; letter-spacing: .12em; }
.feature-copy h3 { margin: 16px 0; font-family: var(--display); font-size: 36px; line-height: 1.25; }
.feature-copy p { color: var(--stone); }
.feature-image-wrap { align-self: end; max-height: 590px; padding: 50px 38px 0; overflow: hidden; }
.feature-image-wrap img { width: 100%; border-radius: 24px 24px 0 0; box-shadow: 0 12px 42px rgba(39, 49, 45, .16); }

.brand-story { padding-top: 36px; }
.brand-heading { max-width: none; display: grid; grid-template-columns: 1fr .72fr; gap: 70px; align-items: end; }
.brand-heading > p { margin: 0 0 6px; color: var(--stone); }
.brand-hero-card { margin: 0; overflow: hidden; border: 1px solid rgba(64, 95, 85, .2); border-radius: 28px; background: var(--paper-clean); box-shadow: 0 22px 66px rgba(39, 49, 45, .1); }
.brand-hero-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.brand-scenes { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.brand-scene { overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: var(--paper-clean); }
.brand-scene-copy { min-height: 156px; padding: 28px 30px; }
.brand-scene h3 { margin: 0; font-family: var(--display); font-size: 28px; line-height: 1.25; }
.brand-scene p { margin: 10px 0 0; color: var(--stone); font-size: 14px; }
.brand-scene img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-top: 1px solid var(--line); }

.privacy-band { color: #f5f1e8; background: var(--sage-deep); }
.privacy-inner { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 100px 0; display: grid; grid-template-columns: .95fr 1.05fr; gap: 70px; align-items: center; }
.privacy-band .eyebrow { color: #d7b65f; }
.privacy-band p { color: #c9d1cd; }
.privacy-points { margin: 0; padding: 0; list-style: none; }
.privacy-points li { display: grid; grid-template-columns: 28px 1fr; gap: 8px; padding: 13px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.privacy-points li::before { content: "✓"; color: #d7b65f; font-weight: 800; }
.privacy-band .text-link { color: #f5f1e8; }
.text-link { min-height: 44px; display: inline-flex; align-items: center; }

.availability-card { padding: 46px; display: grid; grid-template-columns: 88px 1fr auto; gap: 28px; align-items: center; background: var(--paper-clean); border: 1px solid var(--line); border-radius: 28px; box-shadow: 0 20px 60px rgba(39, 49, 45, .07); }
.availability-card img { width: 84px; border-radius: 19px; }
.availability-card h2 { font-size: 44px; }
.availability-card p { max-width: 620px; margin-bottom: 0; color: var(--stone); }
.status-note { grid-column: 2 / -1; margin-top: -18px !important; font-size: 13px; }

.plans { padding-top: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.plan-card { padding: 40px; border: 1px solid var(--line); border-radius: 26px; background: rgba(255, 253, 248, .72); }
.plan-card.pro { background: #e8eee9; border-color: #c7d2cb; }
.plan-card h2 { font-size: 36px; }
.plan-card ul { margin: 24px 0 0; padding-left: 20px; color: var(--stone); }
.plan-note { margin-top: 22px; color: var(--stone); font-size: 13px; }

.site-footer { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 56px 0 40px; display: grid; grid-template-columns: 1fr auto; gap: 30px; border-top: 1px solid var(--line); }
.footer-brand p, .copyright { color: var(--stone); font-size: 13px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 24px; align-items: start; }
.site-footer nav a { min-height: 44px; display: inline-flex; align-items: center; color: var(--stone); font-size: 14px; }
.copyright { grid-column: 1 / -1; }

.content-hero { width: min(900px, calc(100% - 48px)); margin: 0 auto; padding: 88px 0 54px; }
.content-hero h1 { font-size: clamp(46px, 6vw, 72px); }
.content-hero .lead { max-width: 700px; margin-top: 24px; }
.draft-notice { margin-top: 28px; padding: 16px 18px; color: #684d16; background: #fff3cf; border: 1px solid #ead08b; border-radius: 14px; }
.content-shell { width: min(900px, calc(100% - 48px)); margin: 0 auto; padding: 0 0 110px; }
.policy-meta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0 0 44px; padding: 22px; background: var(--paper-clean); border: 1px solid var(--line); border-radius: 18px; }
.policy-meta div { min-width: 0; }
.policy-meta dt { color: var(--stone); font-size: 12px; }
.policy-meta dd { margin: 4px 0 0; font-weight: 650; overflow-wrap: anywhere; }
.prose { padding: 38px 42px; background: rgba(255, 253, 248, .74); border: 1px solid var(--line); border-radius: 24px; }
.prose h2 { margin: 48px 0 14px; font-family: var(--display); font-size: 30px; line-height: 1.28; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 28px; font-size: 20px; }
.prose p, .prose li { color: #3f4b48; }
.prose li + li { margin-top: 9px; }
.prose a { color: var(--sage); }
.support-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.support-card { padding: 30px; background: var(--paper-clean); border: 1px solid var(--line); border-radius: 22px; }
.support-card h2 { margin: 0; font-family: var(--display); font-size: 28px; }
.support-card p { margin-bottom: 0; color: var(--stone); }
.faq { margin-top: 60px; }
.faq h2 { font-family: var(--display); font-size: 36px; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { min-height: 64px; padding: 18px 4px; display: flex; align-items: center; font-weight: 700; cursor: pointer; }
.faq details p { margin: 0; padding: 0 4px 22px; color: var(--stone); }
.contact-panel { margin-top: 58px; padding: 36px; color: #f5f1e8; background: var(--sage-deep); border-radius: 24px; }
.contact-panel h2 { margin: 0; font-family: var(--display); font-size: 32px; }
.contact-panel p { color: #c9d1cd; }

@media (max-width: 900px) {
  .nav-shell { grid-template-columns: auto 1fr auto; }
  .menu-toggle { display: block; justify-self: end; order: 2; }
  .language-picker { order: 3; }
  .nav-links { display: none; position: absolute; left: 20px; right: 20px; top: 68px; padding: 12px; flex-direction: column; gap: 0; background: var(--paper-clean); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 12px; }
  .hero { grid-template-columns: 1fr; }
  .hero-visual { min-height: 600px; }
  .index-layout { grid-template-columns: 1fr; }
  .index-list { display: flex; overflow-x: auto; border-top: 0; border-bottom: 1px solid var(--line); }
  .index-list li { flex: 0 0 auto; }
  .feature-tab { width: auto; grid-template-columns: auto auto; border-bottom: 0; }
  .brand-heading { grid-template-columns: 1fr; gap: 18px; }
  .availability-card { grid-template-columns: 76px 1fr; }
  .availability-card .button { grid-column: 1 / -1; }
  .status-note { grid-column: 1 / -1; margin-top: 0 !important; text-align: center; }
}

@media (max-width: 620px) {
  .nav-shell { width: min(100% - 28px, 1180px); min-height: 66px; gap: 8px; }
  .brand-name { font-size: 21px; }
  .brand-mark { width: 32px; height: 32px; }
  .language-picker::before { display: none; }
  .language-picker select { max-width: 94px; font-size: 13px; }
  .hero, .section-shell, .privacy-inner, .site-footer, .content-shell, .content-hero { width: min(100% - 32px, 1120px); }
  .hero { min-height: auto; padding: 46px 0 68px; }
  .hero h1 { font-size: clamp(40px, 12.5vw, 56px); line-height: 1.04; text-wrap: balance; }
  .hero h1 span { white-space: normal; }
  html[lang="zh-CN"] .hero h1 span { white-space: nowrap; }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-visual { min-height: 490px; }
  .scroll-sheet { width: 74%; padding: 9px; border-radius: 23px; }
  .file-tab { height: 68%; }
  .seal { width: 54px; height: 54px; right: 0; font-size: 15px; }
  .section-shell { padding: 76px 0; }
  .feature-stage { min-height: 0; grid-template-columns: 1fr; }
  .feature-copy { padding: 32px 28px 10px; }
  .feature-copy h3 { font-size: 30px; }
  .feature-image-wrap { max-height: 520px; padding: 24px 28px 0; }
  .brand-scenes, .plans, .support-grid { grid-template-columns: 1fr; }
  .brand-scene-copy { min-height: 0; padding: 24px; }
  .privacy-inner { padding: 76px 0; grid-template-columns: 1fr; gap: 30px; }
  .availability-card { padding: 28px; grid-template-columns: 60px 1fr; gap: 18px; }
  .availability-card img { width: 60px; border-radius: 14px; }
  .availability-card h2 { font-size: 34px; }
  .plan-card { padding: 30px; }
  .site-footer { grid-template-columns: 1fr; }
  .copyright { grid-column: 1; }
  .content-hero { padding-top: 62px; }
  .policy-meta { grid-template-columns: 1fr; }
  .prose { padding: 28px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}