/* ============================================================
   九1官网主页 · 共享样式 /assets/site.css
   深青近单色阶 + 暖橙唯一强调 · 目录型内容地图
   ============================================================ */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

:where(body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, address) { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

button { font: inherit; color: inherit; }

a { color: inherit; text-decoration: none; }

address { font-style: normal; }

[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --deep: #0B3B3C;
  --deep-2: #124E50;
  --mid: #1F6D6E;
  --mist: #D9E5E5;
  --cream: #F7F3EA;
  --accent: #E86A33;
  --accent-hover: #C95322;
  --accent-soft: #F6D8C6;
  --ink: #082B2C;
  --muted: #7C9A9A;

  --wrap: 1180px;
  --pad: clamp(16px, 4vw, 40px);
  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 10px;
  --pill: 999px;

  --shadow-1: 0 1px 0 rgba(8, 43, 44, .06), 0 10px 24px -18px rgba(8, 43, 44, .45);
  --shadow-2: 0 20px 44px -24px rgba(8, 43, 44, .55);

  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Roboto Mono', 'SFMono-Regular', ui-monospace, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .18s;
}

/* ---------- 中文排版基底 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
}

body {
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--deep);
  text-wrap: balance;
}

h1 { font-size: clamp(32px, 5.2vw, 62px); font-weight: 900; }
h2 { font-size: clamp(25px, 3.1vw, 38px); }
h3 { font-size: clamp(20px, 2.1vw, 25px); }

p { text-wrap: pretty; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

/* ---------- 焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.site-footer :focus-visible,
.header-strip :focus-visible {
  outline-color: var(--accent-soft);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -70px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--pill);
  background: var(--accent);
  color: var(--ink);
  font-weight: 800;
  font-size: 14px;
  transition: top .16s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 容器与区块 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section {
  padding-block: clamp(36px, 6vw, 76px);
}

.section--tight { padding-block: clamp(24px, 4vw, 44px); }
.section--mist { background: var(--mist); }
.section--line { border-top: 1px solid rgba(8, 43, 44, .12); }

.section--deep {
  background: var(--deep);
  color: #E9F3F2;
}

.section--deep h1,
.section--deep h2,
.section--deep h3 { color: #fff; }

.section--deep .section-head { border-color: rgba(233, 243, 242, .2); }
.section--deep .section-head__note { color: #9FBEBE; }

/* ---------- 头部：索引状态条 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--deep);
  color: #E9F3F2;
  border-bottom: 1px solid rgba(233, 243, 242, .12);
}

.header-strip {
  background: var(--ink);
  border-bottom: 1px solid rgba(233, 243, 242, .08);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
  padding-block: 4px;
}

.header-strip__note {
  color: #A8C4C3;
  font-weight: 500;
}

.header-strip__meta {
  color: var(--muted);
}

.header-strip .mono {
  color: var(--accent-soft);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(233, 243, 242, .14);
}

.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
  transition: width .12s linear;
}

/* ---------- 头部：品牌 + 命令栏 ---------- */
.masthead {
  position: relative;
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 70px;
  padding-block: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--accent);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.02em;
  box-shadow: inset 0 -2px 0 rgba(8, 43, 44, .18);
}

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

.brand__name {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  letter-spacing: .01em;
}

.brand__tag {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: #8FB0AF;
}

.nav {
  display: block;
  margin-left: 8px;
}

.nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
}

.nav__link {
  display: inline-block;
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(233, 243, 242, .76);
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.nav__link:hover {
  background: rgba(255, 255, 255, .08);
  color: #fff;
}

.nav__link[aria-current="page"] {
  background: var(--accent);
  color: var(--ink);
  font-weight: 800;
  border-color: rgba(8, 43, 44, .14);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 17px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.btn--accent {
  background: var(--accent);
  color: var(--ink);
  border-color: rgba(8, 43, 44, .14);
}

.btn--accent:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}

.btn--ghost {
  background: rgba(255, 255, 255, .04);
  color: #E9F3F2;
  border-color: rgba(233, 243, 242, .3);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, .12);
  border-color: rgba(233, 243, 242, .55);
}

.btn--quiet {
  background: #fff;
  color: var(--deep);
  border-color: rgba(8, 43, 44, .16);
}

.btn--quiet:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}

.btn--small { padding: 7px 13px; font-size: 13.5px; }

/* ---------- 移动端菜单按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(233, 243, 242, .28);
  color: #E9F3F2;
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.site-header[data-open="true"] .nav-toggle__bars { background: transparent; }
.site-header[data-open="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 常用入口面板 ---------- */
.quick-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: max(var(--pad), calc((100% - var(--wrap)) / 2 + var(--pad)));
  z-index: 30;
  width: min(540px, calc(100% - var(--pad) * 2));
  padding: 18px;
  border: 1px solid rgba(8, 43, 44, .12);
  border-radius: var(--r-lg);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--shadow-2);
}

.quick-panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(8, 43, 44, .1);
}

.quick-panel__title {
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .18em;
  color: var(--mid);
}

.quick-panel__hint {
  font-size: 12px;
  color: var(--muted);
}

.quick-panel__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.quick-panel__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border-radius: var(--r-md);
  background: rgba(217, 229, 229, .55);
  transition: background-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.quick-panel__item:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.quick-panel__index {
  padding-top: 2px;
  font-size: 12px;
  color: var(--accent-hover);
}

.quick-panel__label {
  display: block;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--deep);
}

.quick-panel__desc {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  line-height: 1.5;
  color: #5C7C7C;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  padding-block: 16px 4px;
  font-size: 13.5px;
  color: var(--muted);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumbs__list li {
  display: flex;
  align-items: center;
}

.breadcrumbs__list li::after {
  content: "/";
  margin-inline: 8px;
  color: rgba(8, 43, 44, .25);
}

.breadcrumbs__list li:last-child::after { content: none; }

.breadcrumbs a:hover { color: var(--accent-hover); }

.breadcrumbs [aria-current="page"] {
  color: var(--deep);
  font-weight: 700;
}

/* ---------- 标题组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mid);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.section--deep .eyebrow { color: var(--accent-soft); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 34ch);
  align-items: end;
  gap: 14px 28px;
  padding-bottom: 18px;
  margin-bottom: 26px;
  border-bottom: 1px solid rgba(8, 43, 44, .14);
}

.section-head__title { font-size: clamp(24px, 3vw, 36px); }

.section-head__note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.link-accent {
  color: var(--accent-hover);
  font-weight: 700;
  border-bottom: 2px solid rgba(232, 106, 51, .35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.link-accent:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- 网格骨架 ---------- */
.grid {
  display: grid;
  gap: 18px;
}

.grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--four { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, .85fr);
  align-items: start;
}

.grid--rail {
  grid-template-columns: minmax(200px, .55fr) minmax(0, 1.45fr);
  gap: 30px;
  align-items: start;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: 20px;
  border: 1px solid rgba(8, 43, 44, .1);
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: rgba(31, 109, 110, .3);
}

.card--mist { background: var(--mist); }
.card--accent { background: var(--accent-soft); border-color: rgba(232, 106, 51, .32); }

.card--deep {
  background: var(--deep);
  border-color: rgba(233, 243, 242, .16);
  color: #C7DEDD;
}

.card--flat { box-shadow: none; }

.card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--accent-hover);
}

.card__title {
  margin-top: 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--deep);
}

.card--deep .card__title { color: #fff; }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.card__text {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: #3F5E5E;
}

.card--deep .card__text { color: #A9C6C5; }

/* ---------- 胶囊标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid rgba(8, 43, 44, .08);
  border-radius: var(--pill);
  background: rgba(217, 229, 229, .7);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--deep);
}

.chip--accent {
  background: var(--accent);
  color: var(--ink);
  border-color: rgba(8, 43, 44, .14);
}

.chip--soft {
  background: var(--accent-soft);
  color: var(--accent-hover);
  border-color: rgba(232, 106, 51, .28);
}

.chip--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 索引列表 ---------- */
.index-list {
  border-top: 1px solid rgba(8, 43, 44, .14);
}

.index-list__item {
  border-bottom: 1px solid rgba(8, 43, 44, .1);
}

.index-list__link {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 14px 10px;
  border-radius: var(--r-sm);
  transition: background-color .16s var(--ease);
}

.index-list__link:hover {
  background: rgba(217, 229, 229, .55);
}

.index-list__no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
}

.index-list__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--deep);
}

.index-list__date {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  color: var(--accent-hover);
}

/* ---------- 旁注 ---------- */
.note-rail {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--accent);
  font-size: 13.5px;
  line-height: 1.7;
  color: #4E6E6E;
}

.note-rail__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 数据 ---------- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
}

.stat {
  padding: 14px 16px;
  border: 1px solid rgba(8, 43, 44, .1);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .72);
}

.stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  color: var(--deep);
}

.stat__label {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  color: var(--muted);
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid rgba(8, 43, 44, .12);
  border-radius: var(--r-md);
  background: #fff;
}

.data-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(8, 43, 44, .08);
}

.data-table th {
  background: var(--mist);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--deep);
}

.data-table tbody tr:nth-child(even) { background: rgba(217, 229, 229, .32); }
.data-table tbody tr:hover { background: var(--accent-soft); }
.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table td.mono {
  font-family: var(--font-mono);
  color: var(--accent-hover);
}

/* ---------- 标签切换（版本对照） ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.tab {
  padding: 8px 15px;
  border: 1px solid rgba(8, 43, 44, .14);
  border-radius: var(--pill);
  background: #fff;
  color: var(--deep);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color .16s var(--ease),
              color .16s var(--ease),
              border-color .16s var(--ease);
}

.tab:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
}

.tab[aria-selected="true"] {
  background: var(--deep);
  color: #E9F3F2;
  border-color: var(--deep);
}

.tabpanels { display: block; }

/* ---------- 折叠 ---------- */
.disclosure {
  border-bottom: 1px solid rgba(8, 43, 44, .1);
}

.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--deep);
  cursor: pointer;
  list-style: none;
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent-hover);
  transition: transform var(--dur) var(--ease);
}

.disclosure[open] > summary::after {
  content: "–";
}

.disclosure__body {
  padding: 0 8px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: #3F5E5E;
}

/* ---------- 章节导读 ---------- */
.toc {
  position: sticky;
  top: 132px;
}

.toc__title {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc__list {
  display: grid;
  gap: 2px;
}

.toc__link {
  display: block;
  padding: 7px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: 14px;
  color: #3F5E5E;
  transition: background-color .16s var(--ease),
              color .16s var(--ease),
              border-color .16s var(--ease);
}

.toc__link:hover {
  background: rgba(217, 229, 229, .6);
  color: var(--deep);
}

.toc__link[aria-current="true"] {
  border-left-color: var(--accent);
  background: rgba(246, 216, 198, .65);
  color: var(--deep);
  font-weight: 700;
}

/* ---------- 正文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }
.prose ul,
.prose ol { padding-left: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose li::marker { color: var(--accent); }
.prose strong { font-weight: 800; color: var(--deep); }

.prose blockquote {
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  color: #4E6E6E;
}

/* ---------- 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(8, 43, 44, .1);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, var(--mist), #E8EFEF 58%, var(--cream));
}

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

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(31, 109, 110, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 109, 110, .16) 1px, transparent 1px);
  background-size: 12% 12%;
  opacity: .55;
}

.media-frame__inner {
  position: absolute;
  inset: 0;
}

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 5px 12px;
  border-radius: var(--pill);
  background: rgba(11, 59, 60, .88);
  color: #E9F3F2;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(30px, 5vw, 60px);
  padding-top: clamp(36px, 5vw, 64px);
  background: var(--deep);
  color: #C7DEDD;
  border-top: 3px solid var(--accent);
}

.footer-grid {
  display: grid;
  grid-template-columns:
    minmax(0, 1.5fr)
    minmax(0, .85fr)
    minmax(0, .85fr)
    minmax(0, 1.15fr);
  gap: 28px 30px;
  padding-bottom: 30px;
}

.footer-col--map { max-width: 46ch; }

.footer-eyebrow {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #7FA5A4;
}

.footer-title {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: #fff;
}

.footer-note {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #9FBEBE;
}

.footer-note--small {
  margin-top: 14px;
  font-size: 12.5px;
  color: #7FA5A4;
}

.footer-links {
  display: grid;
  gap: 9px;
  font-size: 14.5px;
}

.footer-links--inline {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 16px;
  margin-top: 16px;
}

.footer-links a {
  display: inline-block;
  width: fit-content;
  color: #C7DEDD;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-links a:hover {
  color: #fff;
  border-bottom-color: var(--accent);
}

.footer-links a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

.footer-links--inline a { font-size: 13.5px; }

.footer-address {
  display: grid;
  gap: 12px;
  font-size: 13.5px;
  color: #9FBEBE;
}

.footer-address__row {
  display: grid;
  gap: 3px;
}

.footer-address__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #6E9494;
}

.footer-address .mono {
  color: #E9F3F2;
  font-size: 13.5px;
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-block: 18px 22px;
  border-top: 1px solid rgba(233, 243, 242, .14);
  font-size: 12.8px;
  color: #7FA5A4;
}

.footer-copy .mono { color: #C7DEDD; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.footer-legal a:hover { color: #fff; }
.footer-legal .mono { color: #9FBEBE; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  padding: 10px 16px;
  border: 1px solid rgba(233, 243, 242, .25);
  border-radius: var(--pill);
  background: var(--deep);
  color: #E9F3F2;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s var(--ease),
              transform .2s var(--ease),
              visibility .2s var(--ease),
              background-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  background: var(--accent);
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .nav__link { padding: 8px 10px; font-size: 14px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--map { max-width: none; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 112px; }

  .header-strip__meta { display: none; }

  .masthead__inner {
    flex-wrap: wrap;
    gap: 12px;
    min-height: 62px;
  }

  .nav {
    display: none;
    flex: 1 0 100%;
    margin: 0;
    padding: 10px 0 14px;
    border-top: 1px solid rgba(233, 243, 242, .14);
  }

  .site-header[data-open="true"] .nav { display: block; }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav__link {
    display: block;
    padding: 12px 14px;
    border-radius: var(--r-sm);
    font-size: 15.5px;
  }

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

  .quick-panel {
    position: static;
    width: calc(100% - var(--pad) * 2);
    margin: 0 auto 14px;
    border-radius: var(--r-md);
    box-shadow: var(--shadow-1);
  }

  .grid--two,
  .grid--three,
  .grid--four,
  .grid--split,
  .grid--rail { grid-template-columns: minmax(0, 1fr); }

  .section-head { grid-template-columns: minmax(0, 1fr); }
  .toc { position: static; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .header-strip { font-size: 11.5px; }
  .header-actions .btn--accent { display: none; }

  .quick-panel__grid { grid-template-columns: minmax(0, 1fr); }
  .footer-links--inline { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }

  .index-list__link {
    grid-template-columns: 40px minmax(0, 1fr);
    row-gap: 4px;
    padding: 13px 6px;
  }

  .index-list__date { grid-column: 2; }

  .card { padding: 16px; }
  .to-top { right: 12px; bottom: 12px; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .card:hover,
  .quick-panel__item:hover,
  .btn:hover,
  .btn--quiet:hover { transform: none; }
}