:root {
  --ink: #202829;
  --muted: #647173;
  --accent: #0d7476;
  --accent-dark: #07595b;
  --line: #d8dfe0;
  --soft: #f2f6f6;
  --paper: #ffffff;
  --dark: #252d2e;
  --signal: #c06c36;
}

* { 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; }
.container { width: min(1170px, calc(100% - 48px)); margin: 0 auto; }
.header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); }
.header-rail { min-height: 72px; display: flex; align-items: center; gap: 30px; }
.logo-lockup { display: flex; align-items: center; gap: 11px; white-space: nowrap; }
.logo-lockup img { border-radius: 50%; }
.navigation { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.navigation a { padding: 8px 13px; color: var(--muted); font-size: 14px; border-bottom: 2px solid transparent; }
.navigation a:hover, .navigation a.selected { color: var(--accent-dark); border-color: var(--accent); }
.download-pair { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 25px; }
.small-actions { margin-top: 0; }
.android-button, .ios-button, .text-action { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid var(--accent); border-radius: 3px; background: var(--accent); color: #fff; font-weight: 800; transition: background .2s ease, transform .2s ease; }
.android-button:hover { background: var(--accent-dark); transform: translateY(-1px); }
.ios-button { color: var(--accent-dark); background: #fff; border-color: #a9c8c9; }
.ios-button:hover { color: #fff; background: var(--accent-dark); }
.small-actions a { min-height: 38px; padding: 0 16px; font-size: 14px; }
.menu-button { display: none; width: 42px; height: 42px; padding: 9px; border: 1px solid var(--line); border-radius: 3px; background: #fff; }
.menu-button span { display: block; height: 2px; margin: 5px 0; background: var(--ink); }
.hero { background: #f5f7f7; border-bottom: 1px solid var(--line); }
.hero-rail { min-height: 660px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 62px; align-items: center; padding: 42px 0 48px; }
.label { display: block; margin-bottom: 13px; color: var(--signal); 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-text > p, .inner-hero p { max-width: 620px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }
.hero-notes { margin: 30px 0 0; padding: 0; list-style: none; border-top: 1px solid #c7d0d1; }
.hero-notes li { display: grid; grid-template-columns: 54px 1fr; padding: 10px 0; border-bottom: 1px solid #c7d0d1; font-size: 13px; }
.hero-notes b { color: var(--accent); }
.hero-notes span { color: var(--muted); }
.queue-browser { border: 1px solid #cbd4d5; background: #fff; box-shadow: 0 18px 45px rgba(31,54,55,.12); }
.browser-toolbar { height: 48px; display: flex; align-items: center; justify-content: space-between; padding: 0 18px; background: var(--dark); color: #fff; }
.browser-toolbar > span { font-weight: 800; }
.browser-toolbar div { display: flex; gap: 6px; }
.browser-toolbar i { width: 7px; height: 7px; border-radius: 50%; background: #899293; }
.browser-toolbar i:first-child { background: var(--signal); }
.browser-filter { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.browser-filter span, .browser-filter b { padding: 12px 14px; text-align: center; font-size: 12px; border-right: 1px solid var(--line); }
.browser-filter b { color: var(--accent-dark); background: #e8f3f3; }
.browser-content { display: grid; grid-template-columns: minmax(250px, .9fr) minmax(170px, .6fr); gap: 20px; padding: 20px; }
.app-screen { margin: 0; padding: 14px; background: var(--soft); }
.app-screen img { width: min(100%, 240px); max-width: 400px; margin: 0 auto; border: 1px solid #e0e6e7; }
.usage-panel { padding: 18px; border-left: 1px solid var(--line); }
.usage-panel > span { display: block; margin-bottom: 25px; color: var(--signal); font-size: 12px; font-weight: 900; }
.usage-panel strong { display: block; margin-top: 18px; font-size: 13px; }
.bar { height: 5px; margin-top: 7px; background: #dce4e4; }
.bar::after { content: ""; display: block; height: 100%; background: var(--accent); }
.bar-a::after { width: 78%; }
.bar-b::after { width: 54%; }
.bar-c::after { width: 66%; }
.usage-panel small { display: block; margin-top: 34px; color: var(--muted); }
.section { padding: 80px 0; }
.section-title { margin-bottom: 28px; }
.section-title h2 { margin: 0; font-size: 32px; line-height: 1.2; }
.list-table { border-top: 2px solid var(--dark); }
.list-head, .list-table article { display: grid; grid-template-columns: .7fr 1.7fr .6fr; gap: 24px; align-items: center; }
.list-head { padding: 10px 20px; color: var(--muted); font-size: 12px; border-bottom: 1px solid var(--line); }
.list-table article { padding: 20px; border-bottom: 1px solid var(--line); }
.list-table p { margin: 0; color: var(--muted); }
.list-table em { color: var(--accent-dark); font-size: 13px; font-style: normal; font-weight: 800; }
.functions { background: var(--dark); color: #fff; }
.functions-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 75px; }
.functions-copy p { color: #bdc7c8; }
.functions-copy a { display: inline-block; margin-top: 14px; color: #7ed0d1; font-weight: 800; }
.function-rows { border-top: 1px solid #4d5758; }
.function-rows article { display: grid; grid-template-columns: 46px .75fr 1.25fr; gap: 18px; align-items: baseline; padding: 20px 0; border-bottom: 1px solid #4d5758; }
.function-rows span { color: #7ed0d1; font-size: 12px; }
.function-rows h3, .function-rows p { margin: 0; }
.function-rows p { color: #bdc7c8; font-size: 14px; }
.usage { background: var(--soft); }
.usage-layout { border-left: 5px solid var(--accent); padding-left: 42px; }
.usage-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); }
.usage-columns article { padding: 26px 28px 0 0; }
.usage-columns article + article { padding-left: 28px; border-left: 1px solid var(--line); }
.usage-columns span { color: var(--accent); font-size: 12px; font-weight: 900; }
.usage-columns h3 { margin: 17px 0 8px; }
.usage-columns p { color: var(--muted); font-size: 14px; }
.preview-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.preview-layout figure { margin: 0; min-height: 500px; display: grid; grid-template-columns: 1fr .7fr; gap: 24px; align-items: center; padding: 28px; border: 1px solid var(--line); }
.preview-layout img { width: auto; max-width: 400px; max-height: 420px; margin: 0 auto; border: 1px solid #e1e6e7; }
.preview-layout figcaption { display: grid; gap: 5px; }
.preview-layout figcaption span { color: var(--muted); font-size: 14px; }
.advice { padding-top: 12px; }
.advice-rail { padding-top: 36px; border-top: 3px solid var(--dark); }
.advice-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.advice-list p { margin: 0; padding-right: 24px; }
.advice-list p + p { padding-left: 28px; border-left: 1px solid var(--line); }
.advice-list b, .advice-list span { display: block; }
.advice-list span { margin-top: 7px; color: var(--muted); font-size: 14px; }
.text-action { margin-top: 28px; min-height: 40px; padding: 0; color: var(--accent-dark); background: transparent; border: 0; }
.bottom-download { padding: 46px 0; background: var(--accent-dark); color: #fff; }
.bottom-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.bottom-inner span { color: #a4c7c8; font-size: 12px; }
.bottom-inner h2 { margin: 4px 0 0; font-size: 28px; }
.bottom-inner .download-pair { margin-top: 0; }
.ios-button.inverted { color: #fff; background: transparent; border-color: #86aeb0; }
.footer { padding: 32px 0; background: #171d1e; color: #acb6b7; text-align: center; font-size: 13px; }
.footer p { margin: 4px 0; }
.inner-hero { background: var(--soft); border-bottom: 1px solid var(--line); }
.inner-layout { min-height: 420px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 75px; align-items: center; padding: 48px 0; }
.inner-hero h1 { font-size: 43px; }
.workflow-index { margin: 0; padding: 0; list-style: none; border-top: 4px solid var(--accent); background: #fff; box-shadow: 0 14px 35px rgba(31,54,55,.08); }
.workflow-index li { display: grid; grid-template-columns: 52px 1fr; padding: 13px 20px; border-bottom: 1px solid var(--line); }
.workflow-index b { color: var(--accent); }
.guide-grid, .faq-grid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 72px; align-items: start; }
.guide-nav { position: sticky; top: 98px; display: grid; border: 1px solid var(--line); }
.guide-nav strong { padding: 15px; color: #fff; background: var(--dark); }
.guide-nav a { padding: 10px 15px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
.guide-content section { padding-bottom: 44px; }
.guide-content section + section { padding-top: 38px; border-top: 1px solid var(--line); }
.guide-content section > span { color: var(--accent); font-size: 12px; font-weight: 900; }
.guide-content h2 { margin: 8px 0 14px; font-size: 28px; }
.guide-content p { margin: 0 0 13px; color: #4f5d5f; }
.faq-hero { background: #f5f2ef; }
.faq-content > h2 { margin: 40px 0 8px; padding-bottom: 10px; border-bottom: 2px solid var(--dark); font-size: 25px; }
.faq-content > h2:first-child { margin-top: 0; }
.faq-content details { border-bottom: 1px solid var(--line); }
.faq-content summary { position: relative; padding: 19px 42px 19px 0; cursor: pointer; list-style: none; font-weight: 800; }
.faq-content summary::after { content: "+"; position: absolute; right: 8px; top: 13px; color: var(--accent); font-size: 24px; font-weight: 400; }
.faq-content details[open] summary::after { content: "−"; }
.faq-content details p { margin: -2px 0 22px; color: var(--muted); }

@media (max-width: 980px) {
  .small-actions .ios-button { display: none; }
  .hero-rail { grid-template-columns: .82fr 1.18fr; gap: 28px; }
  .browser-content { grid-template-columns: 1fr; }
  .usage-panel { display: none; }
  .preview-layout figure { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .container { width: min(100% - 32px, 680px); }
  .header-rail { min-height: 64px; }
  .logo-lockup img { width: 40px; height: 40px; }
  .small-actions { margin-left: auto; }
  .small-actions .android-button { display: none; }
  .menu-button { display: block; }
  .navigation { display: none; position: absolute; top: 64px; left: 16px; right: 16px; padding: 10px; border: 1px solid var(--line); background: #fff; box-shadow: 0 14px 32px rgba(32,40,41,.14); }
  .navigation.open { display: grid; }
  .navigation a { padding: 11px 12px; }
  .hero-rail { min-height: 690px; grid-template-columns: 1fr; gap: 18px; padding: 32px 0 16px; }
  .hero h1, .inner-hero h1 { font-size: 34px; line-height: 1.2; }
  .hero-text > p, .inner-hero p { margin-top: 14px; font-size: 15px; }
  .download-pair { margin-top: 19px; }
  .hero-notes { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 20px; border-bottom: 1px solid #c7d0d1; }
  .hero-notes li { display: block; padding: 9px; border-bottom: 0; }
  .hero-notes li + li { border-left: 1px solid #c7d0d1; }
  .hero-notes b, .hero-notes span { display: block; }
  .queue-browser { width: 100%; }
  .browser-toolbar { height: 40px; }
  .browser-content { padding: 10px; }
  .app-screen { padding: 8px; }
  .app-screen img { max-height: 200px; width: auto; }
  .section { padding: 58px 0; }
  .section-title h2 { font-size: 28px; }
  .list-head { display: none; }
  .list-table article { grid-template-columns: 1fr auto; gap: 7px 16px; }
  .list-table article p { grid-column: 1 / -1; }
  .functions-layout, .inner-layout, .guide-grid, .faq-grid { grid-template-columns: 1fr; gap: 36px; }
  .function-rows article { grid-template-columns: 38px 1fr; }
  .function-rows p { grid-column: 2; }
  .usage-layout { padding-left: 24px; }
  .usage-columns { grid-template-columns: 1fr; }
  .usage-columns article { padding: 20px 0; }
  .usage-columns article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .preview-layout { grid-template-columns: 1fr; }
  .preview-layout figure { min-height: auto; grid-template-columns: 130px 1fr; padding: 20px; }
  .preview-layout img { max-height: 240px; }
  .advice-list { grid-template-columns: 1fr; gap: 0; }
  .advice-list p { padding: 17px 0; }
  .advice-list p + p { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .bottom-inner { align-items: flex-start; flex-direction: column; }
  .bottom-inner .download-pair { margin-top: 0; }
  .inner-layout { min-height: auto; padding: 46px 0; }
  .guide-nav { position: static; grid-template-columns: repeat(2, 1fr); }
  .guide-nav strong { grid-column: 1 / -1; }
}

@media (max-width: 420px) {
  .hero-rail { min-height: 680px; }
  .hero h1, .inner-hero h1 { font-size: 31px; }
  .preview-layout figure { grid-template-columns: 110px 1fr; }
}