:root {
  --paper: #f4efe4;
  --paper-deep: #e6dcc9;
  --ink: #10233f;
  --ink-soft: #3f5066;
  --copper: #b85c1e;
  --copper-soft: #e5a56f;
  --teal: #4f7c79;
  --line: rgba(16, 35, 63, .18);
  --white: #fffdf8;
  --shadow: 0 24px 60px rgba(24, 35, 49, .12);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0 31px, rgba(184,92,30,.08) 32px, transparent 33px),
    linear-gradient(rgba(16,35,63,.035) 1px, transparent 1px),
    var(--paper);
  background-size: auto, 100% 32px, auto;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "Microsoft YaHei", serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
img { max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; }
.skip-link { position: fixed; left: 18px; top: -80px; z-index: 100; padding: 10px 16px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 18px; }
.wrap { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(244,239,228,.94);
  backdrop-filter: blur(16px);
}
.header-row { min-height: 76px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 900; letter-spacing: .04em; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border: 2px solid var(--ink); border-radius: 50% 50% 12% 50%; transform: rotate(-8deg); color: var(--copper); }
.brand-mark span { transform: rotate(8deg); }
.nav { margin-left: auto; display: flex; align-items: center; gap: 20px; font-family: "Microsoft YaHei", sans-serif; font-size: .95rem; }
.nav a { text-decoration: none; padding-block: 8px; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a:focus-visible { color: var(--copper); border-color: var(--copper); }
.nav .nav-cta { padding: 8px 15px; color: #fff; background: var(--ink); border-radius: 999px; }
.menu-button { display: none; margin-left: auto; border: 1px solid var(--line); background: var(--white); padding: 8px 12px; border-radius: 10px; }

.hero { padding: 78px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 54px; align-items: stretch; }
.eyebrow { margin: 0 0 16px; color: var(--copper); font: 800 .78rem/1.2 "Microsoft YaHei", sans-serif; letter-spacing: .2em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; line-height: 1.25; }
h1 { font-size: clamp(2.8rem, 7vw, 6.7rem); letter-spacing: -.045em; margin-bottom: 20px; }
h1 em { display: block; color: var(--copper); font-style: normal; }
.hero-lead { max-width: 760px; color: var(--ink-soft); font-size: clamp(1.05rem, 2vw, 1.3rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border: 1px solid var(--ink); border-radius: 999px; text-decoration: none; font-family: "Microsoft YaHei", sans-serif; font-weight: 700; }
.button.primary { background: var(--ink); color: #fff; box-shadow: 6px 6px 0 var(--copper-soft); }
.button.ghost { background: rgba(255,253,248,.6); }
.decision-sheet { padding: 28px; background: var(--ink); color: #fff; border-radius: 3px var(--radius) var(--radius) var(--radius); box-shadow: var(--shadow); transform: rotate(1.2deg); }
.sheet-head { display: flex; justify-content: space-between; gap: 18px; padding-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,.18); }
.sheet-head strong { font-size: 1.35rem; }
.sheet-head span { color: var(--copper-soft); font: 700 .76rem/1.4 "Microsoft YaHei", sans-serif; letter-spacing: .12em; }
.sheet-row { display: grid; grid-template-columns: 90px 1fr; gap: 18px; padding: 20px 0; border-bottom: 1px dashed rgba(255,255,255,.18); }
.sheet-row b { color: var(--copper-soft); }
.sheet-row p { margin: 0; color: #dce5ee; }
.sheet-note { margin: 22px 0 0; color: #b9c9d6; font-size: .9rem; }

.section { padding: 68px 0; }
.section.alt { border-block: 1px solid var(--line); background: rgba(255,253,248,.55); }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 40px; align-items: end; margin-bottom: 32px; }
.section-head h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.5rem); }
.section-head p { margin: 0; color: var(--ink-soft); }
.task-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.task-card { position: relative; min-height: 250px; padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: 3px 20px 20px 20px; box-shadow: 0 9px 24px rgba(16,35,63,.06); }
.task-card::before { content: attr(data-number); position: absolute; right: 18px; top: 14px; color: var(--paper-deep); font-size: 3.6rem; font-weight: 900; }
.task-card h3 { position: relative; font-size: 1.28rem; }
.task-card p { position: relative; color: var(--ink-soft); }
.task-card a { position: absolute; left: 24px; bottom: 22px; color: var(--copper); font-weight: 800; }

.method-line { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line); background: var(--white); }
.method-step { padding: 24px; border-right: 1px solid var(--line); }
.method-step:last-child { border-right: 0; }
.method-step span { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 18px; background: var(--copper); color: #fff; border-radius: 50%; font: 800 .85rem/1 "Microsoft YaHei", sans-serif; }
.method-step h3 { font-size: 1.08rem; }
.method-step p { margin: 0; color: var(--ink-soft); font-size: .94rem; }

.article-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.article-card { display: grid; grid-template-columns: 92px 1fr; gap: 20px; padding: 24px; background: var(--white); border: 1px solid var(--line); text-decoration: none; transition: .2s ease; }
.article-card:hover { transform: translateY(-3px); border-color: var(--copper); box-shadow: var(--shadow); }
.article-card time { color: var(--copper); font: 800 .78rem/1.5 "Microsoft YaHei", sans-serif; }
.article-card h3 { margin-bottom: 10px; font-size: 1.25rem; }
.article-card p { margin: 0; color: var(--ink-soft); }

.page-hero { padding: 64px 0 36px; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 1000px; font-size: clamp(2.5rem, 5.5vw, 5rem); }
.page-hero p { max-width: 820px; color: var(--ink-soft); font-size: 1.12rem; }
.breadcrumbs { padding-top: 24px; color: var(--ink-soft); font: 500 .9rem/1.5 "Microsoft YaHei", sans-serif; }
.breadcrumbs a { color: var(--copper); }
.prose-shell { display: grid; grid-template-columns: minmax(0,1fr) 290px; gap: 52px; align-items: start; }
.prose { padding: 48px; background: rgba(255,253,248,.78); border: 1px solid var(--line); box-shadow: 10px 12px 0 var(--paper-deep); }
.prose .lead { color: var(--ink-soft); font-size: 1.18rem; }
.prose h2 { margin-top: 2.25em; font-size: 1.75rem; }
.prose h3 { margin-top: 1.7em; font-size: 1.25rem; }
.prose p { color: #263b52; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose blockquote { margin: 30px 0; padding: 18px 22px; border-left: 5px solid var(--copper); background: var(--paper); color: var(--ink-soft); }
.article-aside { position: sticky; top: 104px; }
.aside-card { padding: 22px; background: var(--ink); color: #fff; box-shadow: 6px 6px 0 var(--copper-soft); }
.aside-card p { color: #cad7e2; }
.aside-card a { display: block; margin-top: 10px; color: var(--copper-soft); }
.fact-strip { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 0; }
.fact-strip span { padding: 6px 11px; background: rgba(16,35,63,.08); border-radius: 999px; font: 700 .82rem/1.4 "Microsoft YaHei", sans-serif; }

.evidence-box { margin: 42px 0 34px; padding: 24px 26px; border: 1px solid var(--teal); border-left: 7px solid var(--teal); background: #f5faf7; }
.evidence-box h2 { margin-bottom: 12px; font-size: 1.45rem; }
.evidence-kicker { margin: 0 0 6px !important; color: var(--teal) !important; font: 800 .76rem/1.3 "Microsoft YaHei", sans-serif; letter-spacing: .16em; text-transform: uppercase; }
.source-links { display: grid; gap: 10px; padding: 0 !important; list-style: none; }
.source-links li { display: grid; gap: 2px; padding: 12px 14px; background: var(--white); border: 1px solid var(--line); }
.source-links a { color: var(--copper); font-weight: 800; }
.source-links span, .source-empty { color: var(--ink-soft); font-size: .88rem; }
.takeaway { margin-top: 40px; }
.takeaway-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.takeaway-grid > div { display: grid; grid-template-columns: 42px 1fr; gap: 12px; padding: 16px; background: var(--white); border: 1px solid var(--line); }
.takeaway-grid b { display: grid; place-items: center; width: 36px; height: 36px; color: #fff; background: var(--copper); border-radius: 50%; font: 800 .78rem/1 "Microsoft YaHei", sans-serif; }
.takeaway-grid p { margin: 3px 0 0; }
.takeaway-timeline .takeaway-grid, .takeaway-recovery-tree .takeaway-grid { grid-template-columns: 1fr; }
.takeaway-test-log .takeaway-grid > div { border-left: 5px solid var(--teal); }
.takeaway-risk-ledger .takeaway-grid > div { background: #fff8ef; }
.takeaway-permission-audit .takeaway-grid b { border-radius: 3px; background: var(--teal); }
.takeaway-scorecard .takeaway-grid > div { box-shadow: 4px 4px 0 var(--paper-deep); }

.panel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.panel { padding: 26px; background: var(--white); border: 1px solid var(--line); }
.panel h2, .panel h3 { font-size: 1.3rem; }
.panel p { color: var(--ink-soft); }
.checklist { display: grid; gap: 12px; padding: 0; list-style: none; }
.checklist li { padding: 14px 16px 14px 42px; position: relative; border: 1px solid var(--line); background: var(--white); }
.checklist li::before { content: ""; position: absolute; left: 16px; top: 20px; width: 12px; height: 12px; border: 2px solid var(--copper); }

.worksheet { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 32px; background: var(--ink); color: #fff; }
.worksheet label, .worksheet fieldset { display: grid; gap: 8px; margin: 0; }
.worksheet label > span, .worksheet legend { color: var(--copper-soft); font-weight: 800; }
.worksheet select, .worksheet input[type=text] { min-height: 48px; padding: 10px 12px; border: 1px solid rgba(255,255,255,.3); color: #fff; background: #182f4d; }
.worksheet fieldset { grid-column: 1 / -1; padding: 18px; border: 1px solid rgba(255,255,255,.25); }
.worksheet fieldset label { display: flex; align-items: center; gap: 10px; color: #e9f0f5; }
.worksheet .button { grid-column: 1 / -1; width: max-content; background: var(--copper); color: #fff; border-color: var(--copper); cursor: pointer; }
.worksheet-output { margin-top: 24px; padding: 28px; background: var(--white); border: 2px solid var(--copper); }
.worksheet-output dl { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
.worksheet-output dl div { padding: 12px; background: var(--paper); }
.worksheet-output dt { color: var(--copper); font-weight: 800; }
.worksheet-output dd { margin: 4px 0 0; }
.privacy-note { color: var(--ink-soft); font-size: .9rem; }

.contact-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin: 26px 0; }
.contact-list div { padding: 18px; border: 1px solid var(--line); background: var(--white); }
.contact-list dt { color: var(--copper); font-weight: 800; }
.contact-list dd { margin: 7px 0 0; overflow-wrap: anywhere; }
.map-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.map-grid section { padding: 24px; background: var(--white); border: 1px solid var(--line); }
.map-grid a { display: block; margin: 10px 0; color: var(--copper); }
.source-register { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.source-record { padding: 26px; background: var(--white); border: 1px solid var(--line); border-top: 5px solid var(--teal); }
.source-record h2 { font-size: 1.35rem; }
.source-record h2 a { color: var(--copper); }
.source-record p { color: var(--ink-soft); }
.source-domain { overflow-wrap: anywhere; font: 600 .82rem/1.5 "Microsoft YaHei", sans-serif; }

.site-footer { margin-top: 60px; padding: 54px 0 30px; background: var(--ink); color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.5fr .75fr .75fr; gap: 40px; }
.site-footer h2 { font-size: 2rem; }
.site-footer h3 { color: var(--copper-soft); }
.site-footer p { color: #bfcddd; }
.site-footer a { display: block; margin: 7px 0; color: #fff; }
.footer-line { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 38px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.18); color: #9fb0c1; font: 500 .85rem/1.5 "Microsoft YaHei", sans-serif; }

@media (max-width: 960px) {
  .hero-grid, .section-head, .prose-shell { grid-template-columns: 1fr; }
  .task-grid, .panel-grid { grid-template-columns: repeat(2,1fr); }
  .method-line { grid-template-columns: 1fr 1fr; }
  .method-step { border-bottom: 1px solid var(--line); }
  .article-aside { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .wrap { width: min(100% - 28px, 1180px); }
  .header-row { min-height: 66px; }
  .js .menu-button { display: block; }
  .nav { flex-wrap: wrap; gap: 10px 14px; }
  .js .nav { display: none; position: absolute; left: 14px; right: 14px; top: 66px; padding: 16px; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); flex-direction: column; align-items: stretch; }
  .js .nav[data-open] { display: flex; }
  .hero { padding-top: 48px; }
  h1 { font-size: clamp(2.6rem, 15vw, 4.8rem); }
  .decision-sheet { transform: none; }
  .task-grid, .article-grid, .panel-grid, .map-grid, .footer-grid, .worksheet, .contact-list, .source-register, .takeaway-grid { grid-template-columns: 1fr; }
  .method-line { grid-template-columns: 1fr; }
  .method-step { border-right: 0; }
  .article-card { grid-template-columns: 1fr; }
  .prose { padding: 26px 22px; }
  .worksheet fieldset, .worksheet .button { grid-column: auto; }
  .worksheet-output dl { grid-template-columns: 1fr; }
}

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