/* =========================================================
   云鼎主站 · 共享样式表 /assets/site.css
   版本档案室：纸本出版色 + 云端控制台秩序
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --paper: #F4EFE6;
  --paper-2: #FBF8F2;
  --bronze: #226B66;
  --bronze-deep: #14403E;
  --amber: #D69A3C;
  --amber-light: #F1C87F;
  --slate: #7C93A8;
  --slate-deep: #2E3E4E;
  --ink: #221C18;
  --ember: #C4532E;

  --rule: #CFC6B6;
  --rule-soft: #E0D8CA;
  --wash: rgba(34, 107, 102, .06);
  --wash-amber: rgba(214, 154, 60, .16);

  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", Georgia, serif;
  --mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --shell-max: 1240px;
  --gutter: 18px;
  --shadow-slab: 5px 5px 0 rgba(34, 107, 102, .10);
  --shadow-slab-strong: 6px 6px 0 rgba(20, 64, 62, .18);

  --step-2: 14px;
  --step-1: 15px;
  --step0: 16px;
  --step1: 17px;
  --step2: 20px;
  --step3: 26px;
  --step4: 34px;
  --step5: 44px;
  --label: 12px;
}

@media (min-width: 768px) {
  :root { --gutter: 28px; }
}

@media (min-width: 1200px) {
  :root { --gutter: 36px; }
}

/* ---------- 2. 重置与基底 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: var(--step0);
  font-weight: 400;
  line-height: 1.85;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(34, 107, 102, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 107, 102, .045) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
svg,
video { max-width: 100%; height: auto; }

button { font: inherit; }

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--bronze-deep);
}

h1 { font-size: clamp(30px, 4.4vw, 44px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: clamp(20px, 2.4vw, 26px); }
h4 { font-size: var(--step2); }
h5 { font-size: var(--step1); }
h6 { font-size: var(--step-1); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.25em; }

a {
  color: var(--bronze);
  text-decoration: none;
  transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}

a:hover { color: var(--bronze-deep); }

strong, b { font-weight: 700; }

::selection {
  background: var(--amber-light);
  color: var(--bronze-deep);
}

.prose {
  max-width: 68ch;
  font-size: var(--step0);
  line-height: 1.85;
  color: var(--ink);
}

.prose p { margin: 0 0 1em; }

.prose a {
  color: var(--bronze);
  border-bottom: 1px solid rgba(214, 154, 60, .75);
}

.prose a:hover {
  color: var(--bronze-deep);
  border-bottom-color: var(--bronze-deep);
}

.prose ul,
.prose ol { margin: 0 0 1em; }

.prose > :last-child { margin-bottom: 0; }

.mono {
  font-family: var(--mono);
  letter-spacing: .04em;
}

/* ---------- 4. 焦点与无障碍 ---------- */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.slab--deep :focus-visible,
.footer-strip :focus-visible {
  outline-color: var(--amber-light);
}

.skip-link {
  position: absolute;
  left: 14px;
  top: -70px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--bronze-deep);
  color: var(--paper-2);
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: .02em;
  transition: top .16s ease;
}

.skip-link:focus {
  top: 12px;
  color: var(--paper-2);
}

/* ---------- 5. 版心与页面骨架 ---------- */
.shell {
  width: min(100%, calc(var(--shell-max) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.main-content {
  display: block;
  scroll-margin-top: 86px;
}

.page-shell {
  padding-block: 40px 72px;
}

@media (min-width: 1024px) {
  .page-shell { padding-block: 56px 96px; }
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  background-image: none;
}

.site-header__inner {
  display: flex;
  align-items: stretch;
  flex-wrap: nowrap;
  min-height: 62px;
  background: var(--paper);
  border-top: 1px solid var(--bronze);
  border-bottom: 1px solid var(--bronze);
  border-inline: 1px solid var(--rule);
}

/* 品牌戳记 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 11px 18px 11px 0;
  border-right: 1px solid var(--rule);
  color: var(--ink);
}

.brand:hover .brand__name { color: var(--bronze); }

.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  background: var(--bronze-deep);
  color: var(--amber-light);
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-size: var(--step1);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--bronze-deep);
  transition: color .15s ease;
}

.brand__sub {
  font-family: var(--serif);
  font-size: var(--label);
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--slate-deep);
}

/* 导航条 */
.nav-rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
  padding-left: 6px;
}

.nav-rail__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.nav-rail__item { flex: 0 0 auto; }

.nav-rail__link {
  display: block;
  padding: 18px 13px 16px;
  font-size: var(--step-1);
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.nav-rail__link:hover {
  color: var(--bronze-deep);
  background: var(--wash-amber);
}

.nav-rail__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -3px;
}

.nav-rail__link[aria-current="page"] {
  color: var(--bronze-deep);
  font-weight: 700;
  border-bottom-color: var(--amber);
}

/* 速查入口 */
.quickcheck {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  margin-left: auto;
  padding: 9px 14px;
  background: var(--bronze-deep);
  border: 1px solid var(--bronze-deep);
  color: var(--paper-2);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  white-space: nowrap;
}

.quickcheck:hover {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bronze-deep);
}

.quickcheck__text { display: inline-block; }

.quickcheck__mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  opacity: .85;
}

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin: 10px 0 10px auto;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--bronze);
  color: var(--bronze-deep);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  flex: 0 0 auto;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}

.nav-toggle:hover { background: var(--wash-amber); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: var(--bronze-deep);
  transition: background-color .15s ease;
}

.nav-toggle__label { display: inline-block; }

.nav-toggle[aria-expanded="true"] {
  background: var(--bronze-deep);
  border-color: var(--bronze-deep);
  color: var(--paper-2);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i { background: var(--amber-light); }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: 72px;
  background-color: var(--paper);
  background-image: none;
  border-top: 3px solid var(--bronze-deep);
}

.footer-strip {
  background-color: var(--bronze-deep);
  background-image: linear-gradient(115deg, rgba(34, 107, 102, .95) 0%, rgba(20, 64, 62, 1) 48%, rgba(46, 62, 78, 1) 100%);
  color: var(--paper-2);
  border-bottom: 1px solid rgba(241, 200, 127, .3);
}

.footer-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding-block: 24px;
}

.footer-strip__lead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin: 0;
  font-size: var(--step-1);
  color: var(--paper-2);
}

.footer-strip__kicker {
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .1em;
  color: var(--amber-light);
  border: 1px solid rgba(241, 200, 127, .5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px 24px;
  padding-block: 44px 40px;
}

.footer-brand__name {
  margin: 0 0 8px;
  font-size: var(--step2);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--bronze-deep);
}

.footer-brand__desc {
  margin: 0 0 12px;
  max-width: 30ch;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--slate-deep);
}

.footer-brand__mono {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .04em;
  color: var(--bronze);
  word-break: break-all;
}

.footer-col__title {
  margin: 0 0 12px;
  padding-bottom: 8px;
  font-family: var(--serif);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--bronze-deep);
  border-bottom: 1px solid var(--rule);
}

.footer-col__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-col__list a {
  font-size: var(--step-2);
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.footer-col__list a:hover {
  color: var(--bronze-deep);
  border-bottom-color: var(--amber);
}

.footer-col__meta {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--slate-deep);
  word-break: break-all;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-block: 20px 34px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  color: var(--slate-deep);
}

.footer-legal__addr { margin: 0; }

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal__links a {
  color: var(--bronze-deep);
  border-bottom: 1px solid rgba(214, 154, 60, .6);
}

.footer-legal__links a:hover { border-bottom-color: var(--bronze-deep); }

.footer-legal__meta {
  margin: 0 0 0 auto;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .03em;
}

/* ---------- 8. 通用构件 ---------- */
/* 纸张叠层卡片 */
.slab {
  position: relative;
  padding: 22px 24px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-slab);
}

.slab--tight { padding: 16px 18px; }
.slab--flush { box-shadow: none; }

.slab--deep {
  background: var(--bronze-deep);
  border-color: var(--bronze-deep);
  color: var(--paper-2);
  box-shadow: var(--shadow-slab-strong);
}

.slab--deep h2,
.slab--deep h3,
.slab--deep h4 { color: var(--paper-2); }

.slab--deep a { color: var(--amber-light); }
.slab--deep a:hover { color: var(--paper-2); }

.slab--amber {
  background: var(--amber-light);
  border-color: var(--amber);
}

/* 网格 */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* 章节头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 20px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--bronze);
}

.section-head__title { font-size: clamp(20px, 2.4vw, 26px); }

.section-head__note {
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .06em;
  color: var(--slate-deep);
}

/* 竖向版本时间轴 */
.ledger-rail {
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--rule);
}

.ledger-rail__item {
  position: relative;
  padding-bottom: 26px;
}

.ledger-rail__item:last-child { padding-bottom: 0; }

.ledger-rail__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 7px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--slate);
  background: var(--paper);
  border-radius: 50%;
  transition: background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.ledger-rail__item.is-lit::before {
  background: var(--amber);
  border-color: var(--bronze-deep);
  box-shadow: 0 0 0 4px rgba(214, 154, 60, .22);
}

.ledger-rail__meta {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .06em;
  color: var(--bronze);
}

.ledger-rail__title {
  margin: 0 0 4px;
  font-size: var(--step1);
  font-weight: 700;
  color: var(--bronze-deep);
}

.ledger-rail__desc {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--slate-deep);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .05em;
  line-height: 1.6;
  white-space: nowrap;
  color: var(--slate-deep);
  background: var(--paper);
  border: 1px solid var(--rule);
}

.tag--bronze {
  background: transparent;
  border-color: var(--bronze);
  color: var(--bronze-deep);
}

.tag--amber {
  background: var(--amber-light);
  border-color: var(--amber);
  color: var(--bronze-deep);
}

.tag--ember {
  background: transparent;
  border-color: var(--ember);
  color: var(--ember);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--bronze);
  background: transparent;
  color: var(--bronze-deep);
  font-family: var(--sans);
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}

.btn:hover {
  background: var(--bronze);
  border-color: var(--bronze);
  color: var(--paper-2);
}

.btn--primary {
  background: var(--bronze);
  border-color: var(--bronze);
  color: var(--paper-2);
}

.btn--primary:hover {
  background: var(--bronze-deep);
  border-color: var(--bronze-deep);
}

.btn--amber {
  background: var(--amber-light);
  border-color: var(--amber);
  color: var(--bronze-deep);
}

.btn--amber:hover {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bronze-deep);
}

.btn--ghost {
  border-color: var(--rule);
  color: var(--ink);
}

.btn--ghost:hover {
  background: var(--wash-amber);
  border-color: var(--bronze);
  color: var(--bronze-deep);
}

.btn--sm {
  padding: 7px 14px;
  font-size: var(--step-2);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate-deep);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--slate);
}

.breadcrumb a {
  color: var(--bronze);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--bronze-deep);
  border-bottom-color: var(--amber);
}

.breadcrumb [aria-current="page"] { color: var(--ink); }

/* 响应式图片容器 */
.media-frame {
  position: relative;
  margin: 0;
  padding: 8px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
}

.media-frame__inner {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--paper);
  background-image: linear-gradient(150deg, rgba(34, 107, 102, .18) 0%, rgba(46, 62, 78, .24) 100%);
}

.media-frame__inner img,
.media-frame__inner svg,
.media-frame__inner video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__caption {
  margin: 8px 2px 0;
  font-family: var(--mono);
  font-size: var(--label);
  letter-spacing: .04em;
  color: var(--slate-deep);
}

.media-frame--tall .media-frame__inner { aspect-ratio: 4 / 5; }
.media-frame--wide .media-frame__inner { aspect-ratio: 21 / 9; }
.media-frame--square .media-frame__inner { aspect-ratio: 1 / 1; }

/* 筛选标签组 */
.filter-set {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.filter-chip {
  padding: 6px 13px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}

.filter-chip:hover {
  border-color: var(--bronze);
  color: var(--bronze-deep);
}

.filter-chip:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.filter-chip[aria-pressed="true"] {
  background: var(--amber-light);
  border-color: var(--amber);
  color: var(--bronze-deep);
  font-weight: 700;
}

/* 行式数据列表 */
.data-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
}

.data-list > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 14px 18px;
  background: var(--paper-2);
}

.data-list > li[hidden] { display: none; }

/* ---------- 9. 动效 ---------- */
[data-reveal] {
  opacity: 0;
  transition: opacity .32s ease;
}

[data-reveal].is-in { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  [data-reveal] {
    opacity: 1 !important;
    transition: none !important;
  }

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ---------- 10. 响应式：平板与手机 ---------- */
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.1fr;
    gap: 32px;
  }
}

@media (max-width: 1023px) {
  .site-header__inner { flex-wrap: wrap; }

  .brand {
    padding-right: 12px;
    border-right: 0;
  }

  .nav-toggle { display: inline-flex; }

  .nav-rail {
    flex: 1 0 100%;
    order: 3;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    padding-left: 0;
    overflow: hidden;
    background: var(--paper-2);
    transition: max-height .24s ease;
  }

  .nav-rail[data-open] {
    max-height: 34rem;
    border-top: 1px solid var(--rule);
  }

  .nav-rail__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
  }

  .nav-rail__link {
    padding: 14px 12px;
    border-bottom: 1px solid var(--rule-soft);
    border-left: 3px solid transparent;
    white-space: normal;
  }

  .nav-rail__link[aria-current="page"] {
    border-bottom-color: var(--rule-soft);
    border-left-color: var(--amber);
    background: var(--wash-amber);
  }

  .quickcheck {
    margin: 16px 12px 20px;
    justify-content: center;
    align-self: flex-start;
  }
}

@media (max-width: 600px) {
  .footer-legal__meta { margin-left: 0; }
  .ledger-rail { padding-left: 20px; }
  .ledger-rail__item::before { left: -25px; }
  .slab { padding: 18px 16px; }
  .data-list > li { padding: 12px 14px; }
}