/* ============================================================
   开运赛场 KAIYUN ARENA — /assets/site.css
   共享外壳：reset、变量、排版、头部轨道、页脚、通用组件
   ============================================================ */

/* ---------- 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 { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; }

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

table { border-collapse: collapse; }

/* ---------- 变量 ---------- */
:root {
  /* 主色 */
  --ink: #101820;
  --ink-deep: #0B1218;
  --ink-soft: #182531;
  --tianshan: #1F4E6E;
  --sand: #C9A35C;
  --paper: #E8D9BF;
  --orange: #FF6B35;
  --pitch: #2E7D4F;
  --mist: #F4F1EA;
  --steel: #6B7280;
  --bronze: #8A5A2B;
  --alert: #B3261E;

  /* 字体 */
  --font-display: "Barlow Condensed", "Arial Narrow", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺寸 */
  --rail: 268px;
  --wrap: 1180px;
  --gutter: clamp(1rem, 3.6vw, 2.75rem);

  /* 线条与动效 */
  --line: rgba(244, 241, 234, 0.14);
  --line-dark: rgba(16, 24, 32, 0.18);
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 180ms;
  --shadow-sheet: 0 18px 40px -28px rgba(0, 0, 0, 0.75);
}

/* ---------- 全局排版 ---------- */
body {
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.375rem, 5.4vw, 4.5rem); }
h2 { font-size: clamp(1.55rem, 3vw, 2.5rem); line-height: 1.12; }
h3 { font-size: clamp(1.1rem, 1.7vw, 1.4rem); line-height: 1.24; letter-spacing: 0; }
h4 { font-size: 1rem; line-height: 1.3; letter-spacing: 0.01em; }

p { text-wrap: pretty; }

strong { font-weight: 700; color: var(--mist); }

::selection {
  background: var(--orange);
  color: #160A03;
}

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

#main-content { scroll-margin-top: 84px; }

/* ---------- 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid { display: grid; gap: clamp(1rem, 2vw, 1.5rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sand);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--orange);
  transform: skewX(-24deg);
}

.lead {
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: #C9D2DA;
}

.mono,
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(201, 163, 92, 0.55), transparent);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.2rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn--primary {
  background: var(--orange);
  color: #1A0D06;
  box-shadow: 0 10px 24px -16px rgba(255, 107, 53, 0.9);
}

.btn--primary:hover { background: #FF8559; }

.btn--ghost {
  background: transparent;
  border-color: rgba(201, 163, 92, 0.55);
  color: var(--sand);
}

.btn--ghost:hover {
  background: rgba(201, 163, 92, 0.14);
  color: var(--paper);
}

.btn--sand { background: var(--sand); color: #1A1206; }
.btn--sand:hover { background: #D8B675; }

.btn:active { transform: translateY(1px); }

/* ---------- 面板 / 画板 ---------- */
.sheet {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-sheet);
}

.sheet--dark {
  background: var(--ink-soft);
  color: var(--mist);
  border: 1px solid var(--line);
}

.sheet--glass {
  background: rgba(31, 78, 110, 0.3);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(244, 241, 234, 0.16);
  color: var(--mist);
}

.sheet .lead { color: #35414C; }
.sheet .prose { color: #26313A; }
.sheet .prose strong { color: var(--ink); }
.sheet .prose a { color: var(--bronze); }

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  border-radius: 1px;
  line-height: 1.5;
}

.tag--pitch { color: #7BD6A0; border-color: rgba(46, 125, 79, 0.55); background: rgba(46, 125, 79, 0.16); }
.tag--orange { color: #FFB094; border-color: rgba(255, 107, 53, 0.55); background: rgba(255, 107, 53, 0.14); }
.tag--sand { color: var(--sand); border-color: rgba(201, 163, 92, 0.55); background: rgba(201, 163, 92, 0.12); }
.tag--steel { color: #9AA4AE; border-color: rgba(107, 114, 128, 0.55); }

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(46, 125, 79, 0.24);
  flex: 0 0 auto;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}

.breadcrumb li { display: flex; align-items: center; gap: 0.45rem; }
.breadcrumb li + li::before { content: "›"; color: var(--bronze); }
.breadcrumb a { color: #9AA4AE; transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--sand); }
.breadcrumb [aria-current="page"] { color: var(--sand); }

/* ---------- 图片容器（页面阶段放占位图） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(244, 241, 234, 0.12);
  background-color: #17301F;
  background-image:
    repeating-linear-gradient(96deg, rgba(244, 241, 234, 0.06) 0 3px, rgba(244, 241, 234, 0) 3px 46px),
    radial-gradient(120% 100% at 18% 8%, #26573B 0%, #1B3F2C 58%, #102518 100%);
  isolation: isolate;
}

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

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

.media-frame__edge {
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: linear-gradient(90deg, var(--sand), rgba(201, 163, 92, 0));
}

/* ---------- 阅读停顿条 ---------- */
.pause-bar {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 0;
  border-block: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand);
}

.pause-bar::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--orange);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

/* ---------- 主题筛选（仅过滤当前页内容） ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.filter-btn {
  padding: 0.35rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #A9B4BE;
  border: 1px solid rgba(244, 241, 234, 0.22);
  border-radius: 1px;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.filter-btn:hover { border-color: var(--sand); color: var(--paper); }

.filter-btn[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: #160A03;
  font-weight: 700;
}

.filter-status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}

[data-filter-item][hidden] { display: none; }

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: #D3DBE2;
}

.prose > * + * { margin-top: 0.9em; }
.prose h2 { margin-top: 1.9em; }
.prose h3 { margin-top: 1.5em; }
.prose ul,
.prose ol {
  padding-left: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.45em;
}
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose a {
  color: var(--sand);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
}

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

/* ============================================================
   头部：桌面固定左轨 / 移动顶条 + 抽屉
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 18, 24, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  color: var(--mist);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem clamp(0.9rem, 3vw, 1.25rem);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  color: var(--mist);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  background: var(--sand);
  color: #1A1206;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%);
  transition: background-color var(--dur) var(--ease);
}

.brand:hover .brand-mark { background: var(--orange); }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; min-width: 0; }

.brand-text__cn {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.brand-text__en {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--sand);
}

/* 移动端目录按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.8rem;
  background: rgba(31, 78, 110, 0.55);
  border: 1px solid rgba(244, 241, 234, 0.2);
  border-radius: 1px;
  color: var(--mist);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(31, 78, 110, 0.9);
  border-color: var(--sand);
}

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }

.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--sand);
  transition: transform var(--dur) var(--ease), opacity var(--dur) linear, width var(--dur) var(--ease);
}

.nav-toggle__bars i:nth-child(2) { width: 68%; }

.site-header[data-nav-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-nav-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; width: 0; }
.site-header[data-nav-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航本体 */
.site-nav {
  padding: 1.1rem clamp(0.9rem, 3vw, 1.25rem) 1.6rem;
}

.nav-caption {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sand);
}

.nav-caption::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(201, 163, 92, 0.5), rgba(201, 163, 92, 0));
}

.nav-list { display: flex; flex-direction: column; gap: 2px; }

.nav-list a {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.62rem 0.8rem 0.62rem 0.95rem;
  border-left: 2px solid transparent;
  border-radius: 1px;
  color: #AFBAC4;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.nav-list a::after {
  content: attr(data-idx);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--steel);
  transition: color var(--dur) var(--ease);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background: rgba(31, 78, 110, 0.55);
  color: #FFFFFF;
  border-left-color: var(--sand);
  padding-left: 1.15rem;
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after { color: var(--sand); }

.nav-list a[aria-current="page"] {
  background: linear-gradient(90deg, rgba(201, 163, 92, 0.22), rgba(201, 163, 92, 0.02));
  color: #FFFFFF;
  border-left-color: var(--orange);
}

.nav-list a[aria-current="page"]::after { color: var(--orange); }

/* 轮次状态卡 */
.nav-aside {
  margin-top: 1.35rem;
  padding: 0.85rem 0.9rem 1rem;
  background: rgba(31, 78, 110, 0.26);
  border: 1px solid rgba(201, 163, 92, 0.28);
  border-left: 3px solid var(--pitch);
}

.nav-aside__title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9DE3B8;
}

.nav-aside__title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pitch);
  box-shadow: 0 0 0 3px rgba(46, 125, 79, 0.25);
  flex: 0 0 auto;
}

.nav-aside__note {
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  line-height: 1.65;
  color: #93A0AB;
}

.nav-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.4rem;
  padding: 0.5rem 0.7rem;
  background: rgba(255, 107, 53, 0.14);
  border: 1px solid rgba(255, 107, 53, 0.45);
  color: #FFC3A9;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.nav-chip::after { content: "→"; color: var(--orange); }
.nav-chip:hover { background: rgba(255, 107, 53, 0.28); color: #FFFFFF; }

.nav-chip--quiet {
  background: transparent;
  border-color: rgba(244, 241, 234, 0.22);
  color: #9AA6B0;
}

.nav-chip--quiet::after { color: var(--sand); }
.nav-chip--quiet:hover { background: rgba(244, 241, 234, 0.08); color: #FFFFFF; }

.nav-legacy {
  margin-top: 1.1rem;
  padding-top: 0.85rem;
  border-top: 1px dashed rgba(244, 241, 234, 0.16);
  font-size: 0.6875rem;
  line-height: 1.65;
  color: var(--steel);
}

.nav-legacy a {
  color: var(--sand);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.nav-legacy a:hover { color: var(--paper); }

/* 滚动进度 */
.rail-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 5;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--sand));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
  pointer-events: none;
}

/* 跳转链接 */
.skip-link {
  position: fixed;
  top: 0.4rem;
  left: 0.4rem;
  z-index: 200;
  padding: 0.6rem 0.95rem;
  background: var(--orange);
  color: #160A03;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  transform: translateY(-220%);
  transition: transform 160ms var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 移动端抽屉 ---------- */
@media (max-width: 1023px) {
  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    width: min(86vw, 352px);
    overflow-y: auto;
    padding: 4.6rem 1.15rem 2rem;
    background: linear-gradient(200deg, #12202B 0%, #0B1218 72%);
    border-left: 1px solid rgba(201, 163, 92, 0.35);
    box-shadow: -24px 0 50px -30px #000000;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 220ms var(--ease), visibility 0s linear 240ms;
  }

  .site-header[data-nav-open] .site-nav {
    transform: translateX(0);
    visibility: visible;
    transition: transform 220ms var(--ease), visibility 0s;
  }

  .site-header::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 65;
    background: rgba(6, 10, 14, 0.66);
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms var(--ease);
  }

  .site-header[data-nav-open]::after {
    opacity: 1;
    pointer-events: auto;
  }
}

/* ---------- 桌面固定轨道 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail); }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail);
    display: flex;
    flex-direction: column;
    border-bottom: 0;
    border-right: 1px solid rgba(201, 163, 92, 0.28);
    background: linear-gradient(186deg, #101820 0%, #0D161E 48%, #0A1117 100%);
    box-shadow: 18px 0 40px -34px #000000;
  }

  .site-header::before {
    content: "";
    position: absolute;
    inset: 0 6px 0 auto;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(201, 163, 92, 0.35), transparent);
    pointer-events: none;
  }

  .header-bar {
    padding: 1.6rem 1.4rem 1.2rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-toggle { display: none; }

  .site-nav {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 1.15rem 1.1rem 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(201, 163, 92, 0.45) transparent;
  }

  .site-nav::-webkit-scrollbar { width: 4px; }
  .site-nav::-webkit-scrollbar-thumb { background: rgba(201, 163, 92, 0.45); }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: 0;
  background: linear-gradient(180deg, #0C141B 0%, #101820 42%, #0A1016 100%);
  color: #A9B4BE;
  border-top: 1px solid rgba(201, 163, 92, 0.35);
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: repeating-linear-gradient(115deg,
    rgba(201, 163, 92, 0.85) 0 14px,
    rgba(31, 78, 110, 0.85) 14px 28px);
  opacity: 0.7;
}

.footer-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(1.6rem, 3vw, 2.75rem);
  padding-block: clamp(2.2rem, 5vw, 3.4rem) clamp(1.8rem, 4vw, 2.6rem);
}

.footer-brand { min-width: 0; }

.footer-brand__mark {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.footer-brand__mark span {
  display: inline-block;
  margin-left: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--sand);
  vertical-align: middle;
}

.footer-brand__line {
  margin-top: 0.5rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--orange);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--sand);
}

.footer-brand__note {
  margin-top: 0.9rem;
  max-width: 34ch;
  font-size: 0.8125rem;
  line-height: 1.8;
  color: #8E9AA5;
}

.footer-nav { min-width: 0; }
.footer-contact { min-width: 0; }

.footer-head {
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(244, 241, 234, 0.12);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sand);
}

.footer-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 0.9rem;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.24rem 0;
  font-size: 0.875rem;
  color: #B7C1CA;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-list a::before {
  content: "";
  width: 4px;
  height: 4px;
  flex: 0 0 auto;
  background: var(--bronze);
  transform: rotate(45deg);
  transition: background-color var(--dur) var(--ease);
}

.footer-list a:hover { color: var(--mist); transform: translateX(2px); }
.footer-list a:hover::before { background: var(--orange); }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.65;
}

.contact-list li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0.5rem;
  align-items: baseline;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.contact-list__val { color: #C3CDD6; word-break: break-word; }

.contact-list li:first-child .contact-list__val {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.95rem;
  padding: 0.5rem 0.8rem;
  background: transparent;
  border: 1px solid rgba(201, 163, 92, 0.5);
  border-radius: 1px;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.copy-btn::before { content: "⧉"; font-size: 0.85rem; }
.copy-btn:hover { background: rgba(201, 163, 92, 0.16); color: var(--paper); }

.copy-btn[data-copied] {
  background: rgba(46, 125, 79, 0.18);
  border-color: var(--pitch);
  color: #9DE3B8;
}

.footer-base {
  border-top: 1px solid rgba(244, 241, 234, 0.1);
  background: rgba(5, 9, 12, 0.55);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.4rem;
  padding-block: 1rem;
}

.footer-base__brand,
.footer-base__legal,
.footer-base__top {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: #7A858F;
}

.footer-base__legal { color: var(--sand); }

.to-top {
  padding: 0.2rem 0;
  color: #9AA6B0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.to-top:hover { color: var(--orange); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-list { grid-template-columns: minmax(0, 1fr); }
  .footer-base__inner { justify-content: flex-start; }
  .brand-mark { width: 38px; height: 38px; font-size: 1.2rem; }
  .brand-text__cn { font-size: 1rem; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js [data-reveal] { opacity: 1; transform: none; }
  .rail-progress { transition: none; }
  .site-nav { transition: none; }
}