/* ==========================================================================
   竞博体育 JBO — Site Kit
   /assets/site.css
   赛场夜灯指挥台：深墨蓝主场 · 电光青结构线 · 竞速橙行动色 · 荧光绿状态点
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 108px;
}

body { margin: 0; min-height: 100vh; }

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

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

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

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

table { border-collapse: collapse; width: 100%; }

.site-header ul,
.site-footer ul,
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; }

/* --------------------------------------------------------------------------
   2. Tokens
   -------------------------------------------------------------------------- */
:root {
  /* 色板 */
  --ink-900: #061423;
  --ink-800: #0B1F36;
  --steel-700: #153A5C;
  --cyan-500: #12E0E8;
  --orange-500: #FF6B1A;
  --green-400: #00F5A0;
  --paper-050: #F4F7FB;
  --gray-400: #9DB2C8;
  --line-600: #2A4A6A;
  --teal-850: #032B30;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular",
    Menlo, Consolas, monospace;

  /* 字号层级 */
  --fs-micro: 0.66rem;
  --fs-xs: 0.74rem;
  --fs-sm: 0.84rem;
  --fs-body: clamp(15px, 0.35vw + 13.9px, 17px);
  --fs-md: clamp(1.05rem, 0.5vw + 0.95rem, 1.2rem);
  --fs-lg: clamp(1.3rem, 1.4vw + 1rem, 1.7rem);
  --fs-xl: clamp(1.7rem, 2.6vw, 2.4rem);
  --fs-2xl: clamp(2.1rem, 4.4vw, 3.4rem);
  --fs-3xl: clamp(2.6rem, 6vw, 4.6rem);
  --fs-display: clamp(3rem, 8vw, 6.8rem);

  /* 空间与节奏 */
  --gutter: clamp(16px, 3.6vw, 40px);
  --shell: 1480px;
  --measure: 44rem;
  --header-h: 70px;

  /* 形状与动效 */
  --edge: 2px solid var(--line-600);
  --shadow-hard: 6px 6px 0 rgba(18, 224, 232, 0.16);
  --shadow-lift: 10px 10px 0 rgba(255, 107, 26, 0.2);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 150ms;
}

/* --------------------------------------------------------------------------
   3. 中文排版与全局
   -------------------------------------------------------------------------- */
body {
  background-color: var(--ink-900);
  color: var(--paper-050);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); letter-spacing: -0.01em; }

::selection { background-color: var(--cyan-500); color: var(--ink-900); }

:focus-visible {
  outline: 3px solid var(--cyan-500);
  outline-offset: 3px;
}

#main-content { display: block; scroll-margin-top: 96px; }
#main-content:focus { outline: none; }

/* --------------------------------------------------------------------------
   4. 布局容器 / 网格 / 分区
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 980px; }

.section { padding-block: clamp(40px, 6vw, 88px); }

.section--tint {
  background-color: var(--ink-800);
  border-block: 1px solid var(--line-600);
}

.section--deep {
  background-color: var(--teal-850);
  background-image:
    linear-gradient(180deg, rgba(18, 224, 232, 0.08), transparent 60%);
  border-block: 1px solid var(--line-600);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

/* --------------------------------------------------------------------------
   5. 通用文字组件
   -------------------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background-color: var(--orange-500);
  transform: skewX(-24deg);
}

.page-title {
  font-size: var(--fs-2xl);
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.page-title--display {
  font-size: var(--fs-display);
  letter-spacing: -0.03em;
}

.lede {
  max-width: var(--measure);
  margin-top: 18px;
  font-size: var(--fs-md);
  line-height: 1.8;
  color: var(--gray-400);
}

.prose {
  max-width: var(--measure);
  line-height: 1.8;
}

.prose > * + * { margin-top: 1em; }

.prose h2 {
  margin-top: 2em;
  padding-top: 0.6em;
  border-top: 2px solid var(--line-600);
  font-size: var(--fs-lg);
}

.prose h3 { margin-top: 1.6em; font-size: var(--fs-md); }

.prose a {
  color: var(--cyan-500);
  border-bottom: 1px solid rgba(18, 224, 232, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.prose a:hover { color: var(--paper-050); border-bottom-color: var(--orange-500); }

.prose ul, .prose ol {
  padding-left: 1.35em;
  list-style: square;
  color: var(--paper-050);
}

.prose li::marker { color: var(--cyan-500); }

.data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid rgba(18, 224, 232, 0.5);
  background-color: rgba(18, 224, 232, 0.08);
  color: var(--cyan-500);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--green-400);
  box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.16);
  animation: jbo-pulse 2.6s var(--ease) infinite;
  flex: 0 0 auto;
}

@keyframes jbo-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.16); }
  50% { box-shadow: 0 0 0 6px rgba(0, 245, 160, 0.06); }
}

/* --------------------------------------------------------------------------
   6. 卡片面板
   -------------------------------------------------------------------------- */
.panel {
  position: relative;
  background-color: var(--ink-800);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.4vw, 30px);
  transition: box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.panel:hover {
  border-color: var(--cyan-500);
  box-shadow: var(--shadow-lift);
  transform: translate(-2px, -2px);
}

/* --------------------------------------------------------------------------
   7. 图片容器基础（页面阶段填充 img）
   -------------------------------------------------------------------------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: var(--edge);
  background-color: var(--teal-850);
  background-image:
    linear-gradient(135deg, var(--teal-850) 0%, var(--ink-800) 48%, var(--ink-900) 100%);
  box-shadow: 8px 8px 0 rgba(18, 224, 232, 0.12);
  margin: 0;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.03);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(115deg, rgba(6, 20, 35, 0) 44%, rgba(18, 224, 232, 0.16) 45%, rgba(6, 20, 35, 0) 58%),
    radial-gradient(120% 90% at 85% 110%, rgba(255, 107, 26, 0.16), transparent 60%);
}

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

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-050);
  background-image: linear-gradient(180deg, rgba(6, 20, 35, 0), rgba(6, 20, 35, 0.94));
}

.media-frame__badge {
  position: absolute;
  z-index: 2;
  top: 12px;
  left: 12px;
  padding: 4px 8px;
  background-color: var(--orange-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: skewX(-8deg);
}

/* --------------------------------------------------------------------------
   8. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 2px solid transparent;
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn--primary {
  background-color: var(--orange-500);
  color: var(--ink-900);
  box-shadow: 4px 4px 0 rgba(18, 224, 232, 0.35);
}

.btn--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--cyan-500);
}

.btn--primary:active { transform: translate(0, 0); box-shadow: 2px 2px 0 var(--cyan-500); }

.btn--ghost {
  background-color: transparent;
  color: var(--paper-050);
  border-color: var(--line-600);
}

.btn--ghost:hover {
  border-color: var(--cyan-500);
  color: var(--cyan-500);
  background-color: rgba(18, 224, 232, 0.08);
}

.btn--cyan {
  background-color: var(--cyan-500);
  color: var(--ink-900);
  box-shadow: 4px 4px 0 rgba(255, 107, 26, 0.35);
}

.btn--cyan:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--orange-500); }

.btn--block { width: 100%; }

/* --------------------------------------------------------------------------
   9. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--gray-400);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

.breadcrumbs li + li::before {
  content: "/";
  color: var(--steel-700);
}

.breadcrumbs a {
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumbs a:hover { color: var(--cyan-500); border-bottom-color: var(--cyan-500); }

.breadcrumbs [aria-current="page"] { color: var(--paper-050); }

/* --------------------------------------------------------------------------
   10. Skip link
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background-color: var(--orange-500);
  color: var(--ink-900);
  font-weight: 700;
  font-size: var(--fs-sm);
  border: 2px solid var(--ink-900);
  box-shadow: 4px 4px 0 var(--cyan-500);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 10px; }

/* --------------------------------------------------------------------------
   11. HEADER — 紧凑命令栏
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--ink-900);
  border-bottom: 1px solid var(--line-600);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
    90deg,
    rgba(18, 224, 232, 0.09) 0%,
    rgba(18, 224, 232, 0) 38%,
    rgba(255, 107, 26, 0.08) 100%
  );
}

.site-header[data-scrolled="true"] {
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.55);
}

.cmdbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(10px, 1.6vw, 22px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

/* 品牌斜切标牌 */
.brand {
  order: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 44px;
}

.brand__mark {
  display: grid;
  place-items: center;
  padding: 6px 10px;
  background-color: var(--cyan-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transform: skewX(-8deg);
  border: 2px solid var(--ink-900);
  box-shadow: 3px 3px 0 var(--orange-500);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.brand:hover .brand__mark {
  transform: skewX(-8deg) translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--orange-500);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-size: clamp(0.95rem, 1.4vw, 1.08rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: var(--gray-400);
}

.badge-cert {
  order: 2;
  flex: 0 0 auto;
  padding: 4px 9px;
  border: 1px solid rgba(0, 245, 160, 0.42);
  background-color: rgba(0, 245, 160, 0.08);
  color: var(--green-400);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  order: 3;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 12px;
  border-top: 3px solid transparent;
  color: var(--gray-400);
  font-size: var(--fs-sm);
  font-weight: 500;
  font-weight: 600;
  transition: color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  color: rgba(157, 178, 200, 0.7);
  transition: color var(--dur) var(--ease);
}

.nav-label { white-space: nowrap; }

.nav-link:hover {
  color: var(--paper-050);
  background-color: rgba(18, 224, 232, 0.08);
}

.nav-link:hover .nav-index { color: var(--cyan-500); }

.nav-link[aria-current="page"] {
  color: var(--paper-050);
  background-color: var(--ink-800);
  border-top-color: var(--cyan-500);
}

.nav-link[aria-current="page"] .nav-index { color: var(--cyan-500); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 6px;
  width: 5px;
  height: 5px;
  background-color: var(--cyan-500);
}

/* 行动按钮 */
.cmdbar__actions {
  order: 4;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* 移动菜单按钮 */
.nav-toggle {
  order: 5;
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  min-width: 44px;
  padding: 0 12px;
  background-color: var(--ink-800);
  color: var(--paper-050);
  border: 2px solid var(--line-600);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav-toggle:hover { color: var(--cyan-500); border-color: var(--cyan-500); }

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

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

/* 阅读进度 */
.progress {
  position: relative;
  height: 3px;
  width: 100%;
  background-color: rgba(42, 74, 106, 0.6);
  overflow: hidden;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background-image: linear-gradient(90deg, var(--cyan-500), var(--green-400));
  transition: transform 120ms linear;
}

/* 中宽桌面收紧 */
@media (max-width: 1300px) {
  .badge-cert { display: none; }
}

@media (max-width: 1200px) and (min-width: 1080px) {
  .nav-link { padding: 0 9px; font-size: 0.8rem; }
  .brand__tag { display: none; }
}

/* 移动 / 平板命令栏 */
@media (max-width: 1079px) {
  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }

  .badge-cert { display: none; }

  .site-nav {
    order: 3;
    flex: 1 0 100%;
    width: 100%;
    margin-left: 0;
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 180ms var(--ease);
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    min-height: 0;
    overflow: hidden;
    visibility: hidden;
    border-top: 1px solid transparent;
    transition: border-color 180ms var(--ease);
  }

  .site-header[data-open="true"] .site-nav { grid-template-rows: 1fr; }

  .site-header[data-open="true"] .nav-list {
    visibility: visible;
    border-top-color: var(--line-600);
    padding-block: 6px;
  }

  .nav-link {
    width: 100%;
    min-height: 48px;
    padding: 0 12px;
    border-top: 0;
    border-left: 3px solid transparent;
    font-size: 0.95rem;
  }

  .nav-link[aria-current="page"] { border-left-color: var(--cyan-500); }

  .nav-link[aria-current="page"]::after { display: none; }

  .site-header[data-open="true"] .nav-toggle {
    color: var(--cyan-500);
    border-color: var(--cyan-500);
    background-color: rgba(18, 224, 232, 0.1);
  }

  .site-header[data-open="true"] .nav-toggle__bars span:first-child {
    transform: translateY(3px) rotate(45deg);
  }

  .site-header[data-open="true"] .nav-toggle__bars span:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }

  .cmdbar__actions {
    order: 4;
    flex: 1 0 100%;
    justify-content: stretch;
  }

  .cmdbar__actions .btn { flex: 1 1 0; }
}

@media (max-width: 600px) {
  .cmdbar { gap: 8px; padding-block: 8px; }
  .brand__tag { display: none; }
  .brand__name { font-size: 0.95rem; }
  .brand__mark { padding: 5px 8px; font-size: 0.82rem; }
  .nav-toggle { padding: 0 10px; }
  .nav-toggle__label { display: none; }
  .btn { padding: 0 12px; font-size: 0.8rem; }
}

/* --------------------------------------------------------------------------
   12. FOOTER — 低重心信息带
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  background-color: var(--ink-900);
  border-top: 2px solid var(--line-600);
  color: var(--paper-050);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 140px;
  pointer-events: none;
  background-image: linear-gradient(180deg, rgba(18, 224, 232, 0.09), rgba(6, 20, 35, 0));
}

.footer__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: clamp(22px, 3vw, 48px);
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) clamp(24px, 4vw, 44px);
}

.footer__brandline {
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.footer__brandline::before {
  content: "";
  display: block;
  width: 46px;
  height: 4px;
  margin-bottom: 14px;
  background-color: var(--orange-500);
  transform: skewX(-24deg);
}

.footer__summary {
  max-width: 30ch;
  margin-top: 12px;
  color: var(--gray-400);
  font-size: var(--fs-sm);
  line-height: 1.8;
}

.footer__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 5px 10px;
  border: 1px solid rgba(0, 245, 160, 0.32);
  background-color: rgba(0, 245, 160, 0.07);
  color: var(--green-400);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
}

.footer__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-600);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.footer-list {
  display: grid;
  gap: 2px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  font-size: var(--fs-sm);
  color: var(--paper-050);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--line-600);
  transition: background-color var(--dur) var(--ease);
  flex: 0 0 auto;
}

.footer-link:hover {
  color: var(--cyan-500);
  border-bottom-color: var(--cyan-500);
  transform: translateX(3px);
}

.footer-link:hover::before { background-color: var(--orange-500); }

/* 联系区 */
.footer__contact { min-width: 0; }

.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  padding: 5px 0;
  font-size: var(--fs-sm);
  line-height: 1.65;
}

.contact-label {
  flex: 0 0 auto;
  min-width: 40px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--gray-400);
}

.contact-text {
  color: var(--paper-050);
  word-break: break-word;
}

.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 2px 0 8px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line-600);
  background-color: transparent;
  color: var(--cyan-500);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.copy-btn:hover {
  background-color: var(--cyan-500);
  border-color: var(--cyan-500);
  color: var(--ink-900);
}

.copy-status {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: var(--green-400);
}

.copy-status:empty { display: none; }

/* 底部法务带 */
.footer__base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 30px;
  border-top: 1px solid var(--line-600);
}

.footer__legal {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: var(--gray-400);
}

.to-top {
  margin-left: auto;
  min-height: 40px;
  padding: 0 14px;
  background-color: var(--ink-800);
  color: var(--paper-050);
  border: 2px solid var(--line-600);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.to-top:hover {
  color: var(--cyan-500);
  border-color: var(--cyan-500);
  transform: translateY(-2px);
}

@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .footer__grid { grid-template-columns: 1fr; }
  .to-top { margin-left: 0; width: 100%; }
  .footer__base { padding-bottom: 24px; }
}

/* --------------------------------------------------------------------------
   13. 无障碍与动效偏好
   -------------------------------------------------------------------------- */
@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;
    scroll-behavior: auto !important;
  }

  .status-dot { animation: none; box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.16); }
  .panel:hover { transform: none; }
  .btn:hover, .brand:hover .brand__mark, .to-top:hover { transform: none; }
  .footer-link:hover { transform: none; }
}