/* ============================================================
   皇家国际官网 · /assets/site.css
   共享外壳 + 通用组件
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --ink-navy: #0B1F3A;
  --panel-navy: #143154;
  --midnight: #061120;
  --gold: #D4AF37;
  --gold-soft: #F0D77A;
  --gold-dim: rgba(212, 175, 55, 0.28);
  --cinnabar: #C8402F;
  --celadon: #7FA99B;
  --celadon-deep: #4F7569;
  --celadon-wash: #E7EFE9;
  --paper: #F4EFE4;
  --ink-black: #121A24;
  --stone: #9AA3AD;
  --terracotta: #B46A4F;

  --font-head: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, monospace;

  --maxw: 1180px;
  --pad: 80px;
  --line: rgba(154, 163, 173, 0.18);
}

@media (max-width: 1100px) {
  :root { --pad: 48px; }
}
@media (max-width: 640px) {
  :root { --pad: 20px; }
}

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

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

body,
h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: rgba(212, 175, 55, 0.32);
  color: #FFFFFF;
}

/* ---------- 中文排版基线 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  color: var(--paper);
  background-color: var(--ink-navy);
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.26;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(30px, 4.2vw, 48px); font-weight: 700; }
h2 { font-size: clamp(24px, 3vw, 36px); }
h3 { font-size: clamp(19px, 2.1vw, 22px); }
h4 { font-size: 18px; }

p { max-width: 72ch; }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 容器与栅格 ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--6-6 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--7-5 { grid-template-columns: 1.4fr 1fr; }

@media (max-width: 860px) {
  .grid--2,
  .grid--3,
  .grid--6-6,
  .grid--7-5 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 背景分区 ---------- */
.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}
.section--navy {
  background-color: var(--ink-navy);
  color: var(--paper);
}
.section--paper {
  background-color: var(--paper);
  color: var(--ink-black);
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: #101A26; }
.section--celadon {
  background-color: var(--celadon-wash);
  color: #132A24;
}
.section--celadon h1,
.section--celadon h2,
.section--celadon h3 { color: #12241F; }

/* ---------- 正文 ---------- */
.prose {
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.8;
}
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin-top: 2.1em; margin-bottom: 0.6em; }
.prose h3 { margin-top: 1.7em; margin-bottom: 0.5em; }
.prose ul, .prose ol { margin: 1.1em 0; padding-left: 1.2em; }
.prose ul { list-style: none; }
.prose ul > li { position: relative; padding-left: 1em; }
.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose strong { font-weight: 600; }
.prose a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-dim);
}
.prose a:hover { border-bottom-color: var(--gold); }
.section--paper .prose a,
.section--celadon .prose a {
  color: var(--celadon-deep);
  border-bottom-color: rgba(79, 117, 105, 0.45);
}
.section--paper .prose a:hover,
.section--celadon .prose a:hover { border-bottom-color: var(--celadon-deep); }

/* ---------- 眉题 / 标签 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--gold);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  flex: none;
}
.section--paper .eyebrow,
.section--celadon .eyebrow { color: var(--celadon-deep); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.4;
  padding: 4px 10px;
  border: 1px solid rgba(154, 163, 173, 0.35);
  color: #CFD6DD;
  white-space: nowrap;
}
.tag--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: #0B1F3A;
}
.tag--celadon {
  background: rgba(127, 169, 155, 0.16);
  border-color: rgba(127, 169, 155, 0.55);
  color: var(--celadon);
}
.section--paper .tag--celadon,
.section--celadon .tag--celadon {
  background: rgba(127, 169, 155, 0.24);
  border-color: rgba(79, 117, 105, 0.45);
  color: var(--celadon-deep);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}
.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: #0B1F3A;
}
.btn--gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); }
.btn--ghost {
  background: transparent;
  border-color: rgba(212, 175, 55, 0.5);
  color: var(--gold-soft);
}
.btn--ghost:hover { background: rgba(212, 175, 55, 0.14); border-color: var(--gold); color: #FFFFFF; }
.btn--cinnabar {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #FFFFFF;
}
.btn--cinnabar:hover { background: #A93324; border-color: #A93324; }
.btn--celadon {
  background: transparent;
  border-color: rgba(79, 117, 105, 0.55);
  color: var(--celadon);
}
.btn--celadon:hover { background: rgba(127, 169, 155, 0.18); border-color: var(--celadon); color: #EAF2EE; }
.section--paper .btn--celadon,
.section--celadon .btn--celadon {
  color: var(--celadon-deep);
  border-color: rgba(79, 117, 105, 0.6);
}
.section--paper .btn--celadon:hover,
.section--celadon .btn--celadon:hover { background: rgba(127, 169, 155, 0.28); color: #12241F; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__link {
  color: var(--stone);
  text-decoration: none;
  transition: color 0.22s ease;
}
.breadcrumb__link:hover { color: var(--gold-soft); }
.breadcrumb__sep { color: rgba(154, 163, 173, 0.5); }

/* ---------- 框景 / 面板 ---------- */
.frame {
  position: relative;
  border: 1px solid var(--gold-dim);
  padding: clamp(20px, 4vw, 48px);
}
.frame__corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--gold);
  pointer-events: none;
}
.frame__corner--tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.frame__corner--tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.frame__corner--bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.frame__corner--br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.panel {
  position: relative;
  background: var(--panel-navy);
  border: 1px solid rgba(154, 163, 173, 0.18);
  padding: clamp(20px, 3vw, 32px);
  transition: border-color 0.24s ease, transform 0.24s ease;
}
.panel--cut {
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}
.panel:hover { border-color: var(--gold-dim); }
.section--paper .panel,
.section--celadon .panel {
  background: #FBF8F1;
  border-color: rgba(18, 26, 36, 0.14);
}

/* ---------- 图片容器基础 ---------- */
.media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    repeating-linear-gradient(90deg, rgba(154, 163, 173, 0.08) 0 1px, transparent 1px 56px),
    linear-gradient(140deg, var(--panel-navy), var(--ink-navy));
  border: 1px solid rgba(154, 163, 173, 0.22);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media img,
.media picture { width: 100%; height: 100%; display: block; }
.media img { object-fit: cover; }

.figure { margin: 0; }
.figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--stone);
}
.section--paper .figure__caption,
.section--celadon .figure__caption { color: var(--celadon-deep); }

/* ---------- 章节索引 ---------- */
.index-rail {
  position: sticky;
  top: 32px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.5;
}
.index-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 12px;
  border-left: 1px solid rgba(154, 163, 173, 0.25);
  color: var(--stone);
  text-decoration: none;
  text-align: left;
  transition: color 0.22s ease, border-color 0.22s ease;
}
.index-rail__link:hover { color: var(--gold-soft); }
.index-rail__link.is-active {
  color: var(--gold);
  border-left-color: var(--gold);
}
.section--paper .index-rail__link,
.section--celadon .index-rail__link {
  border-left-color: rgba(79, 117, 105, 0.3);
  color: var(--celadon-deep);
}
.section--paper .index-rail__link.is-active,
.section--celadon .index-rail__link.is-active {
  color: #17352C;
  border-left-color: var(--celadon-deep);
  background: rgba(127, 169, 155, 0.18);
}

/* ---------- 显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 版本焦点（共享机制） ---------- */
[data-version-pane] {
  transition: opacity 0.24s ease, border-color 0.24s ease;
}
html[data-version-focus="new"] [data-version-pane="legacy"],
html[data-version-focus="legacy"] [data-version-pane="new"] {
  opacity: 0.62;
}
html[data-version-focus="legacy"] [data-version-pane="legacy"] {
  border-color: rgba(127, 169, 155, 0.55);
}

/* ============================================================
   跳过链接 / 阅读进度
   ============================================================ */
.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 100;
  padding: 10px 18px;
  background: var(--gold);
  color: #0B1F3A;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  background: rgba(212, 175, 55, 0.14);
}
.read-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
  transition: width 0.12s linear;
}

/* ============================================================
   页头
   ============================================================ */
.site-head {
  position: relative;
  color: var(--paper);
  background-color: var(--ink-navy);
  background-image:
    repeating-linear-gradient(90deg, rgba(154, 163, 173, 0.06) 0 1px, transparent 1px 80px),
    linear-gradient(180deg, #0C213D 0%, #0A1B32 100%);
  border-bottom: 1px solid var(--gold-dim);
}

.site-head__inner {
  padding-block: 16px 0;
}

.site-head__utility {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.stamp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  line-height: 1.5;
  color: var(--stone);
  max-width: none;
}
.stamp--gold {
  color: var(--gold);
  margin-left: 6px;
}

.ghost-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--gold-soft);
  text-decoration: none;
  border: 1px solid rgba(212, 175, 55, 0.45);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}
.ghost-link:hover {
  background: rgba(212, 175, 55, 0.14);
  border-color: var(--gold);
  color: #FFFFFF;
}

/* 报头 */
.masthead {
  padding-block: clamp(20px, 3.4vw, 34px) clamp(14px, 2vw, 22px);
  text-align: center;
}

.masthead__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 4vw, 40px);
  width: 100%;
  text-decoration: none;
  color: inherit;
}

.masthead__edge {
  flex: 1 1 0;
  height: 1px;
  min-width: 24px;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.75));
}
.masthead__edge--rev {
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.75), transparent);
}

.masthead__text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: none;
}

.masthead__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  color: var(--paper);
  transition: color 0.22s ease;
}
.masthead__brand:hover .masthead__name { color: var(--gold-soft); }

.masthead__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  line-height: 1.5;
  color: var(--stone);
}

/* 版本切换栏 */
.site-head__bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding-bottom: 16px;
}

.version-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.version-switch__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--stone);
}

.version-switch__track {
  display: flex;
  gap: 3px;
  padding: 3px;
  background: rgba(6, 17, 32, 0.72);
  border: 1px solid var(--gold-dim);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.version-switch__btn {
  padding: 8px 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  color: #C3CBD4;
  white-space: nowrap;
  transition: background-color 0.22s ease, color 0.22s ease;
}
.version-switch__btn:hover { color: var(--gold-soft); }
.version-switch__btn.is-active {
  background: var(--gold);
  color: #0B1F3A;
}
html[data-version-focus="legacy"] .version-switch__btn.is-active {
  background: var(--celadon);
  color: #08211A;
}

.version-switch__hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

/* 主导航 */
.site-nav {
  border-top: 1px solid var(--line);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
}

.site-nav__item + .site-nav__item {
  border-left: 1px solid rgba(154, 163, 173, 0.22);
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 14px 22px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: #CBD3DC;
  text-decoration: none;
  transition: color 0.2s ease;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 8px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s ease;
}
.site-nav__link:hover { color: var(--gold-soft); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--gold); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--cinnabar);
}

/* 移动目录按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid rgba(154, 163, 173, 0.32);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.4;
  color: var(--paper);
  transition: border-color 0.22s ease, color 0.22s ease;
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold-soft); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: none;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.24s ease, top 0.24s ease;
}
.nav-toggle__bars::before { top: 1px; }
.nav-toggle__bars::after { top: 8px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 5px; transform: rotate(-45deg); }

.nav-toggle__label { display: block; }

/* 移动 / 平板 */
@media (max-width: 860px) {
  .site-head__inner { padding-block: 12px 0; }

  .site-head__bar {
    justify-content: space-between;
    gap: 10px;
    padding-bottom: 12px;
  }

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

  .version-switch { gap: 8px; }
  .version-switch__label { display: none; }
  .version-switch__btn { padding: 8px 12px; font-size: 11px; }
  .version-switch__hint { display: none; }

  .site-nav {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    border-top: 1px solid transparent;
    transition: max-height 0.32s ease, opacity 0.22s ease, border-color 0.22s ease;
  }
  .site-nav[data-open] {
    max-height: 560px;
    opacity: 1;
    border-top-color: rgba(154, 163, 173, 0.2);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 4px 0 14px;
  }
  .site-nav__item + .site-nav__item {
    border-left: 0;
    border-top: 1px solid rgba(154, 163, 173, 0.12);
  }
  .site-nav__link {
    padding: 13px 6px;
    font-size: 13px;
    text-align: left;
  }
  .site-nav__link::after { left: 6px; right: auto; width: 40px; bottom: 6px; }

  .masthead { padding-block: 18px 12px; }
  .masthead__name { letter-spacing: 0.12em; text-indent: 0.12em; }
  .masthead__sub { letter-spacing: 0.2em; font-size: 10px; }
  .masthead__edge { min-width: 12px; }
}

@media (max-width: 420px) {
  .stamp { font-size: 9.5px; letter-spacing: 0.12em; }
  .ghost-link { padding: 6px 10px; letter-spacing: 0.12em; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-foot {
  position: relative;
  overflow: hidden;
  background-color: var(--midnight);
  color: #C6CED6;
  border-top: 1px solid rgba(212, 175, 55, 0.22);
}
.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(154, 163, 173, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 163, 173, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
}

.site-foot__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(36px, 5vw, 64px) 24px;
}

.site-foot__rule {
  height: 1px;
  margin-bottom: clamp(26px, 4vw, 44px);
  background: linear-gradient(90deg, var(--gold), rgba(212, 175, 55, 0.12) 55%, transparent);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(24px, 3.4vw, 40px);
}

.foot-col { min-width: 0; }

.foot-col--brand { padding-right: 8px; }

.foot-brand__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: 0.14em;
  line-height: 1.2;
  color: var(--paper);
  max-width: none;
}

.foot-brand__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  line-height: 1.5;
  color: var(--stone);
  max-width: none;
}

.foot-brand__note {
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #A9B3BE;
  max-width: 30ch;
}

.foot-brand__ver {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 10px;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--celadon);
  border: 1px solid rgba(127, 169, 155, 0.4);
}

.foot-col__title {
  padding-top: 12px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--gold);
  border-top: 1px solid rgba(212, 175, 55, 0.28);
}

.foot-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.foot-link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: #C6CED6;
  text-decoration: none;
  transition: color 0.22s ease, transform 0.22s ease;
}
.foot-link:hover {
  color: var(--gold-soft);
  transform: translateX(2px);
}

.foot-contact {
  display: inline-block;
  font-size: 13px;
  line-height: 1.7;
  color: #98A3AE;
  word-break: break-word;
}

.foot-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px dashed rgba(154, 163, 173, 0.22);
  font-size: 12.5px;
  line-height: 1.7;
  color: #98A3AE;
}

.foot-meta__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--celadon);
  padding: 2px 8px;
  border: 1px solid rgba(127, 169, 155, 0.35);
}

.foot-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(154, 163, 173, 0.16);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--stone);
}
.foot-legal p { max-width: none; }

.foot-legal__note {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: rgba(154, 163, 173, 0.7);
}

@media (max-width: 860px) {
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-col--brand { grid-column: 1 / -1; }
  .foot-brand__note { max-width: 46ch; }
}

@media (max-width: 520px) {
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-legal { flex-direction: column; }
}

/* ============================================================
   无障碍与减弱动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .foot-link:hover { transform: none; }
  .read-progress__bar { transition: none; }
}