:root {
  --ink: #1d252d;
  --muted: #62707b;
  --line: #dce1e3;
  --paper: #fffefa;
  --panel: #f2f5f6;
  --blue: #315f78;
  --blue-dark: #234759;
  --moss: #718263;
  --shell: 1200px;
}
* { 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: 1.75; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
.shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.topbar { position: sticky; top: 0; z-index: 30; background: rgba(255,254,250,.96); border-bottom: 1px solid var(--line); }
.nav-shell { min-height: 70px; display: flex; align-items: center; gap: 28px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 4px; }
nav { margin-left: auto; display: flex; gap: 4px; }
nav a { padding: 8px 13px; color: var(--muted); font-size: 14px; }
nav a.active, nav a:hover { color: var(--blue-dark); background: #eef3f5; }
.nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; font-size: 21px; }
.download { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 22px; border-radius: 4px; color: #fff; background: var(--blue); font-weight: 750; }
.download:hover { background: var(--blue-dark); }
.compact { min-height: 40px; padding: 0 17px; }
.hero { background: #eef2f3; border-bottom: 1px solid var(--line); }
.hero-grid { min-height: 640px; display: grid; grid-template-columns: .86fr 1.14fr; gap: 58px; align-items: center; padding: 48px 0; }
.kicker { display: block; color: var(--blue); font-size: 12px; line-height: 1.4; font-weight: 850; letter-spacing: 0; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin: 14px 0 20px; font-size: clamp(42px, 4vw, 60px); line-height: 1.15; letter-spacing: 0; }
.hero-copy > p { max-width: 590px; color: #4c5b65; font-size: 18px; }
.actions { display: flex; align-items: center; gap: 22px; margin: 28px 0 32px; flex-wrap: wrap; }
.plain-link { color: var(--blue-dark); font-weight: 750; }
.query-bar { display: flex; align-items: center; gap: 12px; padding: 13px 16px; background: #fff; border: 1px solid #cfd7da; border-radius: 4px; font-size: 13px; }
.query-bar span { color: var(--muted); }
.query-bar i { color: var(--moss); font-style: normal; }
.device-reel { position: relative; min-height: 490px; display: flex; align-items: flex-end; gap: 18px; padding: 64px 26px 24px; overflow: hidden; background: #dfe8eb; border-radius: 6px; }
.reel-toolbar { position: absolute; left: 0; right: 0; top: 0; min-height: 48px; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; background: var(--blue-dark); color: #fff; font-size: 13px; }
.device { width: calc((100% - 36px) / 3); margin: 0; padding: 10px 8px 0; background: #fff; border-radius: 12px 12px 0 0; box-shadow: 0 14px 28px rgba(28,53,65,.12); }
.device img { width: 100%; max-width: 400px; }
.primary-device { transform: translateY(-18px); }
.task-map { background: #fff; border-bottom: 1px solid var(--line); }
.task-grid { display: grid; grid-template-columns: 1.1fr repeat(3, 1fr); }
.task-grid > * { min-height: 142px; padding: 26px 24px; border-right: 1px solid var(--line); }
.task-grid > *:first-child { border-left: 1px solid var(--line); }
.task-title h2 { margin: 7px 0 0; font-size: 28px; }
.task-grid article b { color: var(--moss); font-size: 13px; }
.task-grid article h3 { margin: 5px 0 4px; font-size: 18px; }
.task-grid article p { margin: 0; color: var(--muted); font-size: 13px; }
.block { padding: 88px 0; }
.heading-row { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 38px; }
.heading-row h2, .matrix-grid h2, .issue-aside h2 { margin: 8px 0 0; font-size: 34px; }
.heading-note { max-width: 560px; color: var(--muted); }
.tools-block { background: var(--paper); }
.tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.tool-grid article { min-height: 285px; padding: 28px; background: #fff; }
.tool-grid article > span { color: var(--moss); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.tool-grid h3 { margin: 48px 0 12px; font-size: 21px; }
.tool-grid p { color: var(--muted); font-size: 14px; }
.tool-grid a { color: var(--blue-dark); font-weight: 750; font-size: 14px; }
.reel-block { background: #edf1f2; }
.view-tabs { display: flex; gap: 4px; }
.view-tabs span { padding: 7px 14px; background: #fff; border: 1px solid var(--line); font-size: 13px; }
.preview-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.preview-row figure { margin: 0; background: #fff; }
.image-mat { height: 430px; display: flex; align-items: flex-end; justify-content: center; padding: 24px 20px 0; background: #dfe6e8; }
.image-mat img { width: auto; max-width: 400px; height: 100%; object-fit: contain; object-position: bottom; }
.preview-row figcaption { padding: 20px; border: 1px solid var(--line); border-top: 0; }
.preview-row figcaption b { font-size: 18px; }
.preview-row figcaption p { margin: 7px 0 0; color: var(--muted); font-size: 14px; }
.matrix-block { background: #fff; }
.matrix-grid { display: grid; grid-template-columns: 290px 1fr; gap: 70px; }
.matrix-note { margin: 18px 0; color: var(--muted); }
.matrix-table { border-top: 1px solid var(--line); }
.matrix-table > div { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); gap: 12px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.matrix-table span { color: var(--muted); }
.cta { padding: 54px 0; color: #fff; background: var(--blue-dark); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.cta h2 { margin: 7px 0 0; font-size: 31px; }
.cta .kicker { color: #b7c8aa; }
.light { color: var(--blue-dark); background: #fff; }
footer { padding: 30px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-inner, .footer-inner p { text-align: center; }
.footer-inner p { margin: 3px 0; }
.manual-hero { padding: 72px 0; background: #edf1f2; border-bottom: 1px solid var(--line); }
.manual-hero-grid { display: grid; grid-template-columns: 1fr 200px; align-items: end; gap: 50px; }
.manual-hero h1 { font-size: 48px; }
.manual-hero p { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: 18px; }
.manual-index { padding: 22px; background: #fff; border: 1px solid var(--line); }
.manual-index span, .manual-index b { display: block; }
.manual-index span { color: var(--muted); font-size: 12px; }
.manual-index b { margin-top: 8px; color: var(--blue); font-size: 30px; }
.timeline { max-width: 1040px; }
.timeline article { display: grid; grid-template-columns: 170px 1fr; gap: 52px; padding: 0 0 58px; }
.timeline-key { border-top: 3px solid var(--blue); padding-top: 14px; }
.timeline-key span { display: block; color: var(--moss); font-size: 27px; font-weight: 850; }
.timeline-key b { font-size: 12px; }
.timeline h2 { margin-bottom: 17px; font-size: 28px; }
.timeline p { color: #4f5d66; }
.timeline a { color: var(--blue-dark); font-weight: 750; }
.manual-cta { display: flex; align-items: center; justify-content: space-between; gap: 22px; padding: 28px; background: var(--panel); border-left: 4px solid var(--moss); }
.manual-cta p { margin: 4px 0 0; }
.issue-layout { display: grid; grid-template-columns: 230px minmax(0, 800px); gap: 70px; justify-content: center; }
.issue-aside { position: sticky; top: 100px; align-self: start; display: grid; gap: 4px; }
.issue-aside h2 { margin-bottom: 14px; }
.issue-aside a { padding: 8px 0; color: var(--muted); }
.issue-list { border-top: 1px solid var(--line); }
.issue-list article { border-bottom: 1px solid var(--line); scroll-margin-top: 90px; }
.issue-list button { width: 100%; min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 0; border: 0; background: none; color: var(--ink); font: inherit; font-weight: 750; text-align: left; cursor: pointer; }
.issue-list button i { display: inline-block; width: 38px; color: var(--moss); font-style: normal; }
.issue-list button b { color: var(--blue); font-size: 22px; }
.answer { padding: 0 38px 22px; color: var(--muted); }
.answer p { margin: 0; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: .8fr 1.2fr; gap: 30px; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .task-grid { grid-template-columns: repeat(2, 1fr); }
  .task-grid > * { border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  .nav-shell { min-height: 64px; }
  .brand img { width: 38px; height: 38px; }
  .nav-toggle { display: block; margin-left: auto; }
  nav { position: absolute; top: 64px; left: 16px; right: 16px; display: none; padding: 8px; background: #fff; border: 1px solid var(--line); }
  nav.open { display: grid; }
  .compact { display: none; }
  .hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 30px; padding: 38px 0 30px; }
  h1 { font-size: 37px; }
  .hero-copy > p { font-size: 16px; }
  .actions { margin: 22px 0 0; }
  .query-bar { display: none; }
  .device-reel { min-height: 205px; padding: 54px 14px 12px; gap: 9px; }
  .device { padding: 5px 4px 0; border-radius: 7px 7px 0 0; }
  .primary-device { transform: translateY(-8px); }
  .task-grid { grid-template-columns: 1fr; }
  .task-grid > * { min-height: auto; padding: 16px 0; border: 0; border-bottom: 1px solid var(--line); }
  .block { padding: 62px 0; }
  .heading-row { display: block; margin-bottom: 28px; }
  .heading-row h2, .matrix-grid h2, .issue-aside h2 { font-size: 29px; }
  .heading-note { margin-top: 12px; font-size: 14px; }
  .tool-grid { grid-template-columns: 1fr; }
  .tool-grid article { min-height: auto; }
  .tool-grid h3 { margin-top: 25px; }
  .preview-row { grid-template-columns: 1fr; }
  .image-mat { height: 350px; }
  .matrix-grid, .manual-hero-grid, .issue-layout { grid-template-columns: 1fr; gap: 30px; }
  .matrix-table > div { grid-template-columns: 1fr 1fr; }
  .cta-inner, .manual-cta { align-items: flex-start; flex-direction: column; }
  .manual-hero { padding: 48px 0; }
  .manual-hero h1 { font-size: 37px; }
  .timeline article { grid-template-columns: 1fr; gap: 20px; padding-bottom: 48px; }
  .timeline-key { display: flex; align-items: center; gap: 12px; }
  .timeline-key span { font-size: 22px; }
  .issue-aside { position: static; }
}