:root {
  --ink: #292727;
  --muted: #6f696a;
  --primary: #a43c49;
  --primary-dark: #7d2732;
  --sage: #4e7868;
  --line: #ded9da;
  --soft: #f6f3f3;
  --paper: #ffffff;
  --deep: #302b2c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
.frame { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); }
.header-frame { min-height: 74px; display: flex; align-items: center; gap: 30px; }
.brand { display: flex; align-items: center; gap: 11px; white-space: nowrap; }
.brand img { border-radius: 7px; }
.nav { margin-left: auto; display: flex; gap: 24px; }
.nav a { padding: 24px 0 20px; color: var(--muted); font-size: 14px; border-bottom: 3px solid transparent; }
.nav a:hover, .nav a.active { color: var(--primary-dark); border-color: var(--primary); }
.header-downloads { display: flex; align-items: center; gap: 14px; }
.download-action, .ios-action, .question-link { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid var(--primary); border-radius: 5px; background: var(--primary); color: #fff; font-weight: 800; transition: background .2s ease, transform .2s ease; }
.download-action:hover, .question-link:hover { background: var(--primary-dark); transform: translateY(-1px); }
.download-action.small { min-height: 38px; padding: 0 17px; font-size: 14px; }
.ios-action { min-height: auto; padding: 0; color: var(--primary-dark); background: transparent; border: 0; }
.ios-action.bordered { min-height: 46px; padding: 0 24px; border: 1px solid #c9a9ad; }
.ios-action.bordered:hover { color: #fff; background: var(--primary-dark); }
.nav-toggle { display: none; min-width: 50px; height: 40px; border: 1px solid var(--line); border-radius: 5px; background: #fff; }
.hero { background: #f8f6f6; border-bottom: 1px solid var(--line); }
.hero-frame { min-height: 650px; display: grid; grid-template-columns: .92fr 1.08fr; gap: 64px; align-items: center; padding: 44px 0 48px; }
.overline { display: block; margin-bottom: 13px; color: var(--primary); font-size: 12px; font-weight: 900; letter-spacing: 0; }
.hero h1, .inner-hero h1 { max-width: 610px; margin: 0; font-size: 48px; line-height: 1.15; letter-spacing: 0; }
.hero-copy > p, .inner-hero p { max-width: 625px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }
.download-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.checkpoint-summary { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 30px; border-top: 1px solid #d0cacc; border-bottom: 1px solid #d0cacc; }
.checkpoint-summary span { padding: 12px 9px 12px 0; color: var(--muted); font-size: 13px; }
.checkpoint-summary span + span { padding-left: 12px; border-left: 1px solid #d0cacc; }
.checkpoint-summary b { display: block; color: var(--primary); font-size: 11px; }
.service-visual { position: relative; height: 520px; border: 1px solid #d4cecf; background: #fff; box-shadow: 0 18px 44px rgba(67,48,51,.11); overflow: hidden; }
.service-title { height: 48px; display: flex; align-items: center; justify-content: space-between; padding: 0 18px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.account-screen, .permission-screen { position: absolute; margin: 0; border: 7px solid #f1eeee; background: #fff; overflow: hidden; }
.account-screen { left: 34px; top: 74px; width: 220px; }
.permission-screen { z-index: 2; left: 205px; top: 105px; width: 210px; box-shadow: 0 16px 32px rgba(52,41,43,.18); }
.account-screen img, .permission-screen img { width: 100%; max-width: 400px; }
.service-rail { position: absolute; right: 20px; top: 84px; width: 122px; margin: 0; padding: 0; list-style: none; border-left: 1px solid var(--line); }
.service-rail li { display: grid; grid-template-columns: 28px 1fr; gap: 7px; padding: 14px 0 14px 14px; color: var(--muted); font-size: 12px; border-bottom: 1px solid var(--line); }
.service-rail b { color: var(--primary); }
.service-rail .ready { color: var(--sage); font-weight: 800; }
.service-rail .ready b { color: var(--sage); }
.section-space { padding: 80px 0; }
.heading { margin-bottom: 28px; }
.heading h2 { margin: 0; font-size: 32px; line-height: 1.2; }
.authorization-flow { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.authorization-flow article { min-height: 245px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.authorization-flow span { color: var(--primary); font-size: 12px; font-weight: 900; }
.authorization-flow h3 { margin: 45px 0 9px; font-size: 18px; }
.authorization-flow p { color: var(--muted); font-size: 14px; }
.functions { background: var(--deep); color: #fff; }
.functions-frame { display: grid; grid-template-columns: .72fr 1.28fr; gap: 72px; }
.function-lead p { color: #c7bfc1; }
.function-lead a { display: inline-block; margin-top: 14px; color: #ddb5bb; font-weight: 800; }
.function-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid #5b5254; border-left: 1px solid #5b5254; }
.function-grid article { min-height: 190px; padding: 24px; border-right: 1px solid #5b5254; border-bottom: 1px solid #5b5254; }
.function-grid h3 { margin: 0 0 8px; }
.function-grid p { color: #c7bfc1; font-size: 14px; }
.function-grid span { display: block; margin-top: 30px; color: #88b3a2; font-size: 11px; }
.service-state { background: var(--soft); }
.state-frame { display: grid; grid-template-columns: 1.25fr .75fr; gap: 70px; align-items: center; }
.state-table { border-top: 2px solid var(--primary); }
.state-table div { display: grid; grid-template-columns: 1.4fr .6fr; gap: 24px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.state-table span { color: var(--muted); }
.state-table b { color: var(--sage); font-size: 14px; }
.state-note { padding: 30px; border: 1px solid var(--line); border-top: 4px solid var(--sage); background: #fff; }
.state-note > span { color: var(--sage); font-size: 12px; font-weight: 900; }
.state-note h3 { margin: 16px 0 9px; font-size: 23px; }
.state-note p { color: var(--muted); }
.gallery-frame { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.gallery-frame figure { min-height: 500px; margin: 0; display: grid; grid-template-columns: 1fr .7fr; gap: 25px; align-items: center; padding: 28px; border: 1px solid var(--line); }
.gallery-frame img { max-width: 400px; max-height: 420px; margin: 0 auto; border: 1px solid #e5dfe0; }
.gallery-frame figcaption { display: grid; gap: 5px; }
.gallery-frame figcaption span { color: var(--muted); font-size: 14px; }
.install { padding-top: 15px; }
.install-frame { padding-top: 34px; border-top: 3px solid var(--primary); }
.install-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.install-list p { margin: 0; padding: 0 24px 0 0; }
.install-list p + p { padding-left: 24px; border-left: 1px solid var(--line); }
.install-list b, .install-list span { display: block; }
.install-list span { margin-top: 7px; color: var(--muted); font-size: 14px; }
.questions { background: #f8f4f4; }
.question-frame { display: flex; align-items: center; justify-content: space-between; gap: 42px; }
.question-frame .heading { margin-bottom: 7px; }
.question-frame p { margin: 0; color: var(--muted); }
.question-link { white-space: nowrap; }
.closing { padding: 46px 0; background: var(--primary-dark); color: #fff; }
.closing-frame { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.closing-frame > div > span { color: #d7b7bb; font-size: 12px; }
.closing-frame h2 { margin: 4px 0 0; font-size: 28px; }
.closing-frame .download-row { margin-top: 0; }
.ios-action.light { min-height: 46px; padding: 0 24px; color: #fff; border: 1px solid #bd8990; }
.footer { padding: 32px 0; background: #241d1e; color: #bfb3b5; text-align: center; font-size: 13px; }
.footer p { margin: 4px 0; }
.inner-hero { background: var(--soft); border-bottom: 1px solid var(--line); }
.inner-frame { min-height: 420px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 72px; align-items: center; padding: 48px 0; }
.inner-hero h1 { font-size: 43px; }
.inner-checks { display: grid; border: 1px solid var(--line); background: #fff; }
.inner-checks span { padding: 14px 18px; color: var(--primary); font-size: 12px; font-weight: 900; border-bottom: 1px solid var(--line); }
.inner-checks b { padding: 12px 18px; font-size: 14px; border-bottom: 1px solid var(--line); }
.inner-checks b:last-child { border-bottom: 0; }
.article-frame, .faq-frame { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 72px; align-items: start; }
.article-nav { position: sticky; top: 100px; display: grid; border: 1px solid var(--line); }
.article-nav strong { padding: 15px; color: #fff; background: var(--deep); }
.article-nav a { padding: 10px 15px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
.article section { padding-bottom: 44px; }
.article section + section { padding-top: 38px; border-top: 1px solid var(--line); }
.article section > span { color: var(--primary); font-size: 11px; font-weight: 900; }
.article h2 { margin: 8px 0 14px; font-size: 28px; }
.article p { margin: 0 0 13px; color: #514b4c; }
.faq-inner { background: #f2f5f3; }
.faq-list > h2 { margin: 40px 0 8px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); font-size: 25px; }
.faq-list > h2:first-child { margin-top: 0; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 19px 42px 19px 0; cursor: pointer; list-style: none; font-weight: 800; }
.faq-list summary::after { content: "+"; position: absolute; right: 8px; top: 13px; color: var(--primary); font-size: 24px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -2px 0 22px; color: var(--muted); }

@media (max-width: 1020px) {
  .nav { gap: 14px; }
  .header-downloads .ios-action { display: none; }
  .hero-frame { grid-template-columns: .82fr 1.18fr; gap: 30px; }
  .account-screen { left: 20px; }
  .permission-screen { left: 160px; }
  .service-rail { display: none; }
}

@media (max-width: 760px) {
  .frame { width: min(100% - 32px, 680px); }
  .header-frame { min-height: 64px; }
  .brand img { width: 40px; height: 40px; }
  .header-downloads { margin-left: auto; }
  .header-downloads .download-action { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav { display: none; position: absolute; top: 64px; left: 16px; right: 16px; padding: 8px 16px; border: 1px solid var(--line); background: #fff; box-shadow: 0 14px 30px rgba(61,42,46,.14); }
  .nav.open { display: grid; }
  .nav a { padding: 11px 0; border-bottom: 1px solid var(--line); }
  .hero-frame { min-height: 710px; grid-template-columns: 1fr; gap: 18px; padding: 34px 0 24px; }
  .hero h1, .inner-hero h1 { font-size: 34px; line-height: 1.2; }
  .hero-copy > p, .inner-hero p { margin-top: 14px; font-size: 15px; }
  .download-row { margin-top: 19px; }
  .checkpoint-summary { margin-top: 20px; }
  .service-visual { height: 270px; }
  .service-title { height: 40px; }
  .account-screen { left: 12%; top: 56px; width: 130px; border-width: 4px; }
  .permission-screen { left: 46%; top: 68px; width: 125px; border-width: 4px; }
  .section-space { padding: 58px 0; }
  .heading h2 { font-size: 28px; }
  .authorization-flow { grid-template-columns: 1fr; }
  .authorization-flow article { min-height: auto; padding: 23px; }
  .authorization-flow h3 { margin-top: 22px; }
  .functions-frame, .state-frame, .inner-frame, .article-frame, .faq-frame { grid-template-columns: 1fr; gap: 36px; }
  .function-grid { grid-template-columns: 1fr; }
  .function-grid article { min-height: auto; }
  .state-table div { grid-template-columns: 1fr; gap: 4px; }
  .gallery-frame { grid-template-columns: 1fr; }
  .gallery-frame figure { min-height: auto; grid-template-columns: 130px 1fr; padding: 20px; }
  .gallery-frame img { width: 100%; max-width: 100%; max-height: 235px; object-fit: contain; }
  .install-list { grid-template-columns: 1fr; }
  .install-list p { padding: 16px 0; }
  .install-list p + p { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .question-frame, .closing-frame { align-items: flex-start; flex-direction: column; }
  .closing-frame .download-row { margin-top: 0; }
  .inner-frame { min-height: auto; padding: 46px 0; }
  .article-nav { position: static; grid-template-columns: repeat(2, 1fr); }
  .article-nav strong { grid-column: 1 / -1; }
}

@media (max-width: 420px) {
  .hero-frame { min-height: 695px; }
  .hero h1, .inner-hero h1 { font-size: 31px; }
  .gallery-frame figure { grid-template-columns: 110px 1fr; }
}