:root {
  --ink: #171d2b;
  --muted: #626c80;
  --line: #d9deea;
  --panel: #ffffff;
  --fog: #f2f4f8;
  --indigo: #3f51a2;
  --indigo-dark: #2e3b7b;
  --teal: #2d766a;
  --night: #20294d;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--panel);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }

.topbar { position: sticky; top: 0; z-index: 60; background: #fff; border-bottom: 1px solid var(--line); }
.topbar-inner, .workspace-shell, .capability-inner, .block-inner, .closing-panel, .footer-content, .manual-head-inner, .manual-shell, .diagnostic-inner, .diagnostic-shell { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.topbar-inner { height: 74px; display: flex; align-items: center; gap: 30px; }
.identity { display: flex; align-items: center; gap: 10px; }
.identity img { width: 42px; height: 42px; border-radius: 8px; }
.identity span { display: grid; line-height: 1.2; }
.identity strong { font-size: 16px; }
.identity small { color: var(--muted); font-size: 11px; margin-top: 3px; }
.main-nav { margin-left: auto; height: 100%; display: flex; align-items: center; gap: 24px; }
.main-nav a { height: 100%; display: inline-flex; align-items: center; color: #4e5870; font-size: 14px; font-weight: 750; border-bottom: 3px solid transparent; }
.main-nav a.current, .main-nav a:hover { color: var(--indigo); border-color: var(--indigo); }
.top-actions { display: flex; align-items: center; gap: 10px; }
.download-primary, .download-ios, .action-fill, .action-line, .closing-main, .closing-ios { min-height: 42px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; border-radius: 5px; font-weight: 800; font-size: 14px; }
.download-primary, .action-fill { color: #fff; background: var(--indigo); }
.download-ios, .action-line { color: var(--indigo-dark); border: 1px solid #aeb7d5; background: #fff; }
.nav-trigger { display: none; border: 0; background: transparent; color: var(--ink); font-size: 24px; }

.workspace-hero { background: var(--fog); border-bottom: 1px solid var(--line); }
.workspace-shell { min-height: 610px; display: grid; grid-template-columns: 78px minmax(0, 1.05fr) minmax(390px, .95fr); align-items: center; gap: 46px; padding: 48px 0; }
.workspace-rail { height: 390px; padding: 12px 0; border-right: 1px solid var(--line); display: flex; flex-direction: column; justify-content: space-around; align-items: center; color: #7d8495; font-size: 12px; }
.workspace-rail span { writing-mode: vertical-rl; }
.workspace-rail .rail-active { color: var(--indigo); font-weight: 900; position: relative; }
.workspace-rail .rail-active::after { content: ""; position: absolute; width: 3px; height: 24px; right: -34px; top: 50%; transform: translateY(-50%); background: var(--indigo); }
.kicker { color: var(--indigo); font-size: 12px; font-weight: 900; }
.workspace-copy h1 { margin: 14px 0 18px; font-size: 50px; line-height: 1.14; letter-spacing: 0; }
.lead { color: var(--muted); font-size: 17px; max-width: 640px; }
.workspace-actions { display: flex; gap: 10px; margin-top: 28px; }
.action-fill, .action-line { min-height: 48px; padding: 0 24px; }
.condition-row { display: flex; gap: 20px; margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--line); color: #515b70; font-size: 13px; }
.condition-row span { display: flex; align-items: center; gap: 7px; }
.condition-row b { color: var(--indigo); }
.status-preview { justify-self: end; width: min(100%, 420px); padding: 18px; background: #fff; border: 1px solid var(--line); box-shadow: 0 20px 45px rgba(41, 51, 95, .1); }
.preview-toolbar, .preview-note { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.preview-toolbar { margin-bottom: 14px; color: var(--muted); font-size: 12px; }
.preview-toolbar b { color: var(--teal); }
.status-preview img { width: 100%; max-width: 400px; margin: 0 auto; border: 1px solid #e1e4ec; }
.preview-note { margin-top: 14px; }
.preview-note span { color: var(--teal); font-size: 12px; font-weight: 850; }
.preview-note strong { font-size: 13px; }

.capability-strip { background: #fff; border-bottom: 1px solid var(--line); }
.capability-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.capability-inner article { min-height: 132px; padding: 24px; border-right: 1px solid var(--line); display: grid; align-content: center; }
.capability-inner article:first-child { border-left: 1px solid var(--line); }
.capability-inner span { color: var(--muted); font-size: 12px; }
.capability-inner strong { margin: 4px 0 2px; font-size: 18px; }
.capability-inner small { color: #747d90; }

.block { padding: 84px 0; }
.block-title span { color: var(--indigo); font-size: 11px; font-weight: 900; }
.block-title h2 { margin: 6px 0 0; font-size: 32px; line-height: 1.2; }
.advantage-grid { margin-top: 32px; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.advantage-grid article { min-height: 170px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.advantage-grid b { font-size: 18px; }
.advantage-grid div { margin-top: 10px; color: var(--muted); }

.fit-check { background: var(--fog); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.fit-layout { display: grid; grid-template-columns: .65fr 1.35fr; gap: 70px; }
.fit-description { margin: 22px 0; color: var(--muted); }
.text-link { color: var(--indigo); font-weight: 850; }
.fit-table { background: #fff; border: 1px solid var(--line); }
.fit-row { display: grid; grid-template-columns: .7fr 1.3fr 1fr; gap: 14px; padding: 18px 20px; border-bottom: 1px solid var(--line); align-items: center; }
.fit-row:last-child { border-bottom: 0; }
.fit-head { background: #e8ebf4; color: #505a74; font-size: 12px; font-weight: 800; }
.fit-row span, .fit-row em { color: var(--muted); font-size: 13px; font-style: normal; }
.fit-row em { color: var(--teal); font-weight: 750; }

.preview-grid { margin-top: 32px; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; align-items: stretch; }
.preview-grid figure { margin: 0; padding: 16px; border: 1px solid var(--line); background: #fff; position: relative; display: flex; flex-direction: column; }
.preview-grid img { max-width: 400px; width: 100%; margin: auto; object-fit: contain; }
.real-shot img { margin-top: 60px; margin-bottom: 60px; }
.figure-label { position: absolute; left: 16px; top: 16px; padding: 5px 9px; background: var(--teal); color: #fff; font-size: 11px; font-weight: 850; }
.figure-label-note { background: var(--indigo); }
.preview-grid figcaption { padding-top: 14px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }

.process-block { background: var(--night); color: #fff; }
.process-layout { display: grid; grid-template-columns: .55fr 1.45fr; gap: 70px; }
.process-block .block-title span { color: #9eabef; }
.process-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.16); }
.process-list li { background: var(--night); padding: 26px; display: flex; gap: 15px; }
.process-list li > span { width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid #9eabef; color: #c8d0ff; }
.process-list div { display: grid; }
.process-list small { margin-top: 7px; color: #bfc6dc; }

.question-layout { display: grid; grid-template-columns: .55fr 1.45fr; gap: 70px; }
.question-links { border-top: 1px solid var(--line); }
.question-links a { display: flex; justify-content: space-between; padding: 20px 4px; border-bottom: 1px solid var(--line); font-weight: 750; }
.question-links b { color: var(--indigo); }

.closing-panel { margin-top: 10px; margin-bottom: 84px; padding: 36px 42px; background: #e9ecf5; border: 1px solid #cfd5e6; display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.closing-panel span { color: var(--indigo); font-size: 12px; font-weight: 850; }
.closing-panel h2 { margin: 4px 0 0; font-size: 25px; }
.closing-panel > div:last-child { display: flex; gap: 10px; }
.closing-main { background: var(--indigo); color: #fff; }
.closing-ios { background: #fff; border: 1px solid #aeb7d5; color: var(--indigo-dark); }

.site-footer { background: #f6f7fa; border-top: 1px solid var(--line); }
.footer-content { padding: 32px 0; text-align: center; }
.footer-mark { display: inline-flex; align-items: center; gap: 8px; }
.footer-mark img { border-radius: 7px; }
.footer-content p { text-align: center; color: var(--muted); font-size: 13px; margin: 14px auto 8px; max-width: 760px; }
.footer-content small { color: #858b99; }

.manual-head, .diagnostic-head { background: var(--fog); border-bottom: 1px solid var(--line); }
.manual-head-inner, .diagnostic-inner { min-height: 440px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 80px; align-items: center; padding: 52px 0; }
.manual-head span, .diagnostic-head span { color: var(--indigo); font-size: 12px; font-weight: 900; }
.manual-head h1, .diagnostic-head h1 { font-size: 43px; line-height: 1.2; margin: 14px 0; letter-spacing: 0; }
.manual-head div > div, .diagnostic-head div > div { color: var(--muted); font-size: 16px; }
.manual-head img, .diagnostic-head img { max-width: 280px; max-height: 330px; justify-self: end; object-fit: contain; border: 1px solid var(--line); }
.manual-shell, .diagnostic-shell { padding: 68px 0 94px; }
.manual-summary { display: grid; grid-template-columns: 1.2fr repeat(4, 1fr); border: 1px solid var(--line); margin-bottom: 60px; }
.manual-summary > * { padding: 17px; border-right: 1px solid var(--line); }
.manual-summary > *:last-child { border-right: 0; }
.manual-summary span { color: var(--muted); font-size: 13px; }
.manual-content { max-width: 900px; margin-left: auto; }
.manual-content section { display: grid; grid-template-columns: 70px 1fr; gap: 22px; padding: 0 0 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.manual-no { color: var(--indigo); font-weight: 900; }
.manual-content h2 { margin: -4px 0 12px; font-size: 27px; }
.manual-content p { color: #4f5970; }
.manual-next { margin-left: auto; max-width: 900px; padding: 28px; background: var(--fog); border: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.manual-next span { color: var(--indigo); font-size: 12px; font-weight: 850; }
.manual-next h2 { margin: 4px 0 0; font-size: 21px; }
.manual-next a { padding: 11px 18px; background: var(--indigo); color: #fff; font-weight: 800; }

.diagnostic-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; }
.diagnostic-filter button { padding: 9px 15px; border: 1px solid var(--line); background: #fff; color: var(--muted); cursor: pointer; }
.diagnostic-filter button.selected { background: var(--indigo); color: #fff; border-color: var(--indigo); }
.diagnostic-list { border-top: 1px solid var(--line); }
.diagnostic-item { border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.diagnostic-item[hidden] { display: none; }
.diagnostic-item button { width: 100%; border: 0; background: transparent; padding: 20px 0; display: flex; justify-content: space-between; align-items: center; text-align: left; cursor: pointer; color: var(--ink); font-weight: 800; }
.diagnostic-item button b { display: inline-block; width: 88px; color: var(--indigo); font-size: 12px; }
.diagnostic-item button i { color: var(--indigo); font-size: 20px; font-style: normal; }
.diagnostic-item > div { display: none; padding: 0 70px 20px 88px; }
.diagnostic-item button[aria-expanded="true"] + div { display: block; }
.diagnostic-item p { margin: 0; color: var(--muted); }
.diagnostic-shell .manual-next { max-width: none; margin-top: 56px; }

@media (max-width: 980px) {
  .topbar-inner { flex-wrap: wrap; height: auto; min-height: 70px; padding: 12px 0; }
  .nav-trigger { display: block; margin-left: auto; }
  .main-nav { display: none; order: 4; width: 100%; height: auto; margin: 0; flex-direction: column; align-items: stretch; gap: 0; border-top: 1px solid var(--line); }
  .main-nav.open { display: flex; }
  .main-nav a { min-height: 40px; border-bottom-width: 1px; }
  .top-actions { display: none; }
  .workspace-shell { grid-template-columns: 54px 1fr 350px; gap: 25px; }
  .workspace-copy h1 { font-size: 41px; }
  .condition-row { flex-wrap: wrap; }
  .preview-grid { grid-template-columns: 1fr 1fr; }
  .real-shot { grid-column: span 2; }
  .real-shot img { margin: 20px auto; max-width: 360px; }
}

@media (max-width: 720px) {
  .topbar-inner, .workspace-shell, .capability-inner, .block-inner, .closing-panel, .footer-content, .manual-head-inner, .manual-shell, .diagnostic-inner, .diagnostic-shell { width: min(100% - 32px, 620px); }
  .workspace-shell { min-height: auto; grid-template-columns: 1fr; padding: 38px 0 42px; gap: 24px; }
  .workspace-rail { display: none; }
  .workspace-copy h1 { font-size: 36px; margin: 10px 0 14px; }
  .lead { font-size: 15px; }
  .workspace-actions { margin-top: 20px; }
  .workspace-actions a { flex: 1; padding: 0 10px; }
  .condition-row { display: none; }
  .status-preview { justify-self: center; max-width: 300px; padding: 12px; }
  .status-preview img { max-height: 205px; object-fit: contain; }
  .preview-note { display: none; }
  .capability-inner { grid-template-columns: 1fr 1fr; }
  .capability-inner article { min-height: 110px; border-bottom: 1px solid var(--line); }
  .block { padding: 60px 0; }
  .block-title h2 { font-size: 28px; }
  .advantage-grid, .fit-layout, .process-layout, .question-layout { grid-template-columns: 1fr; }
  .advantage-grid article { min-height: auto; }
  .fit-layout, .process-layout, .question-layout { gap: 30px; }
  .fit-row { grid-template-columns: 1fr; gap: 3px; }
  .fit-head { display: none; }
  .preview-grid { grid-template-columns: 1fr; }
  .real-shot { grid-column: auto; }
  .preview-grid figure { max-width: 420px; width: 100%; margin: 0 auto; }
  .process-list { grid-template-columns: 1fr; }
  .closing-panel { margin-bottom: 60px; padding: 28px 22px; flex-direction: column; align-items: stretch; }
  .closing-panel > div:last-child { flex-direction: column; }
  .manual-head-inner, .diagnostic-inner { min-height: auto; grid-template-columns: 1fr; gap: 28px; padding: 40px 0; }
  .manual-head h1, .diagnostic-head h1 { font-size: 34px; }
  .manual-head img, .diagnostic-head img { justify-self: center; max-width: 210px; max-height: 245px; }
  .manual-summary { grid-template-columns: 1fr 1fr; }
  .manual-summary strong { grid-column: span 2; }
  .manual-summary > * { border-bottom: 1px solid var(--line); }
  .manual-content section { grid-template-columns: 1fr; gap: 8px; }
  .manual-next { align-items: stretch; flex-direction: column; }
  .manual-next a { text-align: center; }
  .diagnostic-item button b { display: block; width: auto; margin-bottom: 3px; }
  .diagnostic-item > div { padding-left: 0; padding-right: 32px; }
}

@media (max-width: 390px) {
  .workspace-copy h1, .manual-head h1, .diagnostic-head h1 { font-size: 31px; }
  .capability-inner { grid-template-columns: 1fr; }
}