/* ============================================================
   三亿体育APP「CN」官网 · Site Kit
   文件：/assets/site.css
   角色：全局 reset、设计令牌、页头/轨道导航/页脚、通用组件、响应式与动效
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --bg-ink: #0a192f;
  --bg-panel: #112240;
  --bg-line: #1e3a5f;
  --bg-light: #f5efe6;
  --accent-green: #39ff14;
  --accent-orange: #ff6b35;
  --text-light: #e6f1ff;
  --text-muted: #8892b0;
  --glass: rgba(230, 241, 255, 0.08);
  --font-display: 'Montserrat', 'Noto Sans SC', system-ui, sans-serif;
  --font-data: 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;
  --font-body: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --header-h: 72px;
  --rail-width: 72px;
  --container-max: 1200px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-panel: 0 14px 34px rgba(2, 8, 20, 0.5);
}

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

* {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background-color: var(--bg-ink);
  background-image:
    linear-gradient(135deg, rgba(57, 255, 20, 0.025) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255, 107, 53, 0.02) 25%, transparent 25%);
  background-size: 32px 32px;
  color: var(--text-light);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
figure,
p {
  margin: 0;
}

ul,
ol {
  list-style: none;
}

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

img {
  height: auto;
}

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

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

a {
  color: inherit;
}

[hidden] {
  display: none !important;
}

::selection {
  background: rgba(57, 255, 20, 0.35);
  color: var(--bg-ink);
}

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

.skip-link:focus-visible {
  outline: none;
}

section[id],
[data-scroll-spy-target] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ---------- 无障碍跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 99;
  padding: 8px 16px;
  background-color: var(--accent-green);
  color: var(--bg-ink);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transform: translateY(-160%);
  transition: transform 200ms var(--ease);
}

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

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 95;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 页头容器 ---------- */
.site-header {
  position: relative;
  z-index: 70;
}

/* ---------- 顶部品牌栏 ---------- */
.header-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--header-h);
  padding: 0 clamp(16px, 3vw, 36px);
  background-color: rgba(10, 25, 47, 0.9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bg-line);
}

@media (min-width: 1024px) {
  .header-topbar {
    left: var(--rail-width);
  }
}

/* ---------- 品牌组合 ---------- */
.brand-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.brand-mark-hex {
  display: grid;
  place-items: center;
}

.brand-mark-ping {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 8px;
  height: 8px;
  background-color: var(--accent-orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.brand-ident {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-light);
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--accent-green);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- 顶部快捷入口 ---------- */
.header-actions {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

@media (min-width: 640px) {
  .header-actions {
    display: flex;
  }
}

.action-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  background-color: var(--bg-panel);
  color: var(--text-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color 250ms var(--ease), color 250ms var(--ease);
}

.action-link:hover {
  background-color: var(--glass);
  color: var(--accent-green);
}

.action-link--accent {
  background-color: var(--accent-green);
  color: var(--bg-ink);
}

.action-link--accent:hover {
  background-color: var(--bg-panel);
  color: var(--accent-green);
}

.action-icon {
  flex-shrink: 0;
}

/* ---------- 汉堡按钮 ---------- */
.nav-drawer-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  margin-left: auto;
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
}

@media (min-width: 640px) {
  .nav-drawer-toggle {
    margin-left: 0;
  }
}

@media (min-width: 1024px) {
  .nav-drawer-toggle {
    display: none;
  }
}

.toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-light);
  transition: transform 250ms var(--ease), opacity 200ms var(--ease), background-color 200ms var(--ease);
}

.nav-drawer-toggle:hover .toggle-line {
  background-color: var(--accent-green);
}

.nav-drawer-toggle[aria-expanded="true"] .toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-drawer-toggle[aria-expanded="true"] .toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-drawer-toggle[aria-expanded="true"] .toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 左侧轨道导航 ---------- */
.side-rail-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  width: var(--rail-width);
  overflow: hidden;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--bg-line);
  transition: width 350ms var(--ease);
}

.rail-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-shrink: 0;
  height: var(--header-h);
  padding: 0;
  overflow: hidden;
  color: var(--text-light);
  text-decoration: none;
  border-bottom: 1px solid var(--bg-line);
  transition: justify-content 350ms var(--ease), padding 350ms var(--ease);
}

.rail-logo {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  background-color: var(--bg-ink);
  border: 1px solid var(--bg-line);
}

.rail-sigil-text {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 250ms 80ms var(--ease), transform 250ms 80ms var(--ease);
}

@media (min-width: 1024px) {
  .side-rail-nav:hover,
  .side-rail-nav:focus-within {
    width: 224px;
  }

  .side-rail-nav:hover .rail-brand,
  .side-rail-nav:focus-within .rail-brand {
    justify-content: flex-start;
    padding-left: 20px;
  }

  .side-rail-nav:hover .rail-sigil-text,
  .side-rail-nav:focus-within .rail-sigil-text {
    opacity: 1;
    transform: translateX(0);
  }

  .side-rail-nav:hover .rail-label,
  .side-rail-nav:focus-within .rail-label {
    opacity: 1;
    transform: translateX(0);
  }
}

.rail-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 0;
  overflow-y: auto;
}

.rail-item {
  position: relative;
  flex-shrink: 0;
}

.rail-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 50px;
  padding: 0 0 0 22px;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 250ms var(--ease), color 250ms var(--ease);
}

.rail-link:hover {
  background-color: var(--glass);
  color: var(--text-light);
}

.rail-link[aria-current="page"] {
  color: var(--accent-green);
}

.rail-num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  opacity: 0.75;
  min-width: 2.4em;
}

.rail-link[aria-current="page"] .rail-num {
  opacity: 1;
}

.rail-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 250ms 80ms var(--ease), transform 250ms 80ms var(--ease);
}

.rail-mark {
  position: absolute;
  top: 50%;
  left: 0;
  width: 3px;
  height: 0;
  background-color: var(--accent-green);
  transform: translateY(-50%);
  transition: height 300ms var(--ease);
}

.rail-link[aria-current="page"] .rail-mark {
  height: 26px;
}

.rail-foot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  padding: 14px 0;
  border-top: 1px solid var(--bg-line);
}

.vertical-annotation {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--text-muted);
}

.rail-foot-code {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
}

/* ---------- 抽屉遮罩与关闭按钮 ---------- */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 75;
  background-color: rgba(4, 12, 26, 0.66);
  opacity: 0;
  transition: opacity 300ms var(--ease);
}

.nav-scrim.is-open {
  opacity: 1;
}

.drawer-close {
  display: none;
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--bg-ink);
  border: 1px solid var(--bg-line);
  color: var(--text-muted);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.drawer-close:hover {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* ---------- 移动端抽屉 ---------- */
@media (max-width: 1023px) {
  .side-rail-nav {
    width: min(320px, 86vw);
    transform: translateX(-100%);
    transition: transform 300ms var(--ease);
  }

  .side-rail-nav[data-open] {
    transform: translateX(0);
  }

  .rail-brand {
    justify-content: flex-start;
    padding-left: 20px;
    padding-right: 56px;
  }

  .rail-sigil-text,
  .rail-label {
    opacity: 1;
    transform: translateX(0);
  }

  .rail-link {
    padding-left: 24px;
  }

  .drawer-close {
    display: inline-flex;
  }
}

body.nav-open {
  overflow: hidden;
}

/* ---------- 主体与内容容器 ---------- */
.site-main {
  display: block;
  min-height: calc(100vh - var(--header-h));
  padding-top: var(--header-h);
  margin-left: 0;
}

@media (min-width: 1024px) {
  .site-main {
    margin-left: var(--rail-width);
  }
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 44px);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: clamp(20px, 3vw, 32px);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

.breadcrumb-sep {
  color: var(--accent-orange);
}

/* ---------- 无 Hero 首屏 ---------- */
.page-intro {
  padding: clamp(28px, 5vw, 64px) 0 clamp(24px, 4vw, 48px);
}

.page-intro-label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--accent-orange);
  text-transform: uppercase;
}

.page-intro-label::before {
  content: '// ';
  color: var(--accent-green);
}

.page-intro-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--text-light);
  margin: 0 0 14px;
}

.page-intro-lead {
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- 章节标题 ---------- */
.section-block {
  margin-bottom: clamp(48px, 7vw, 88px);
}

.section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
}

.section-index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent-orange);
  white-space: nowrap;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-light);
  margin: 0;
}

.section-title small {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  margin-top: 6px;
}

.diag-rule {
  flex: 1;
  max-width: 140px;
  height: 4px;
  background: linear-gradient(135deg, var(--accent-green) 0 40%, var(--bg-line) 40%);
  transform: skewX(-20deg);
}

/* ---------- 反向米白面板 ---------- */
.reverse-panel {
  padding: clamp(28px, 5vw, 56px);
  background-color: var(--bg-light);
  color: var(--bg-ink);
}

.reverse-panel .section-title {
  color: var(--bg-ink);
}

.reverse-panel p,
.reverse-panel li {
  color: #33415c;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.4;
  color: var(--text-light);
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 250ms var(--ease), border-color 250ms var(--ease),
    color 250ms var(--ease), transform 250ms var(--ease);
}

.btn:hover {
  background-color: rgba(57, 255, 20, 0.06);
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.btn--primary {
  background-color: var(--accent-green);
  border-color: var(--accent-green);
  color: var(--bg-ink);
  font-weight: 700;
}

.btn--primary:hover {
  background-color: transparent;
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.btn--ghost {
  background-color: transparent;
}

.btn--sm {
  padding: 6px 14px;
  font-size: 13px;
}

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

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: var(--grid-gap, 20px);
  grid-template-columns: 1fr;
}

.grid-cols-2,
.grid-cols-3,
.grid-cols-5-7,
.grid-cols-3-5 {
  grid-template-columns: 1fr;
}

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

@media (min-width: 768px) {
  .grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid-cols-5-7 {
    grid-template-columns: 5fr 7fr;
  }

  .grid-cols-3-5 {
    grid-template-columns: 3fr 5fr;
  }
}

/* ---------- 数据卡 ---------- */
.data-card {
  position: relative;
  padding: 24px;
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
  transition: transform 300ms var(--ease), border-color 300ms var(--ease), box-shadow 300ms var(--ease);
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-orange));
  transition: width 300ms var(--ease);
}

.data-card:hover,
.data-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--accent-green);
  box-shadow: var(--shadow-panel), 0 0 0 1px rgba(57, 255, 20, 0.16);
}

.data-card:hover::before,
.data-card:focus-within::before {
  width: 100%;
}

.data-card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-light);
  margin-bottom: 6px;
}

.data-card-meta {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.data-card-value {
  font-family: var(--font-data);
  font-size: 30px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--accent-green);
}

.data-card-value small {
  font-size: 14px;
  color: var(--text-muted);
  margin-left: 4px;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--accent-green);
  background-color: rgba(57, 255, 20, 0.07);
  border: 1px solid rgba(57, 255, 20, 0.3);
}

.tag::before {
  content: '';
  width: 4px;
  height: 4px;
  background-color: currentColor;
  transform: rotate(45deg);
}

.tag--orange {
  color: var(--accent-orange);
  background-color: rgba(255, 107, 53, 0.08);
  border-color: rgba(255, 107, 53, 0.32);
}

.tag--muted {
  color: var(--text-muted);
  background-color: transparent;
  border-color: var(--bg-line);
}

.tag--muted::before {
  display: none;
}

/* ---------- 媒体占位框架 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--bg-panel);
  background-image:
    linear-gradient(135deg, rgba(57, 255, 20, 0.05) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255, 107, 53, 0.04) 25%, transparent 25%);
  background-size: 18px 18px;
  border: 1px solid var(--bg-line);
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 60%, rgba(57, 255, 20, 0.09) 100%);
  opacity: 0;
  transition: opacity 300ms var(--ease);
}

.media-frame:hover::after {
  opacity: 1;
}

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.media-frame img,
.media-frame video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  max-width: calc(100% - 18px);
  padding: 6px 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent-green);
  background-color: rgba(10, 25, 47, 0.86);
  border-left: 3px solid var(--accent-orange);
}

.figure {
  position: relative;
  margin: 0;
}

.figure-credit {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--text-muted);
}

/* ---------- 数据表 ---------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-scroll .data-table {
  min-width: 640px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 13px;
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
}

.data-table th,
.data-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--bg-line);
}

.data-table th {
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent-green);
  background-color: rgba(57, 255, 20, 0.05);
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover td {
  background-color: rgba(230, 241, 255, 0.03);
}

/* ---------- 手风琴 ---------- */
.accordion {
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
}

.accordion + .accordion {
  margin-top: -1px;
}

.accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-light);
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

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

.accordion summary::after {
  content: '+';
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--accent-green);
}

.accordion[open] summary::after {
  content: '−';
}

.accordion summary:hover {
  background-color: rgba(57, 255, 20, 0.04);
  color: var(--accent-green);
}

.accordion-body {
  padding: 0 20px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- 正文链接 ---------- */
.text-link {
  color: var(--accent-green);
  text-decoration: underline;
  text-decoration-color: rgba(57, 255, 20, 0.4);
  text-underline-offset: 4px;
  transition: color 200ms var(--ease), text-decoration-color 200ms var(--ease);
}

.text-link:hover {
  color: var(--text-light);
  text-decoration-color: var(--accent-green);
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-left: 0;
  padding: clamp(32px, 5vw, 64px) clamp(20px, 4vw, 48px) 32px;
  background-color: var(--bg-panel);
  border-top: 1px solid var(--bg-line);
}

@media (min-width: 1024px) {
  .site-footer {
    margin-left: var(--rail-width);
  }
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  max-width: var(--container-max);
  margin-inline: auto;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-about {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 5fr 3fr 2fr;
  }

  .footer-about {
    grid-column: auto;
  }
}

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

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding-bottom: 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-light);
  border-bottom: 1px solid var(--bg-line);
}

.footer-col-num {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--bg-ink);
  background-color: var(--accent-orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-light);
}

.footer-brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background-color: var(--bg-ink);
  border: 1px solid var(--bg-line);
}

.footer-about-text {
  max-width: 56ch;
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.footer-trust {
  margin-top: 14px;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--text-muted);
  background-color: var(--bg-ink);
  border-left: 3px solid var(--accent-green);
}

.footer-contact-list {
  margin: 0 0 14px;
}

.footer-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--bg-line);
}

.contact-label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent-orange);
}

.contact-value {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-light);
  word-break: break-all;
}

.footer-link-list li {
  margin-bottom: 2px;
}

.footer-link-list a {
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 200ms var(--ease), transform 200ms var(--ease);
}

.footer-link-list a::before {
  content: '/';
  margin-right: 8px;
  font-family: var(--font-data);
  color: var(--accent-orange);
}

.footer-link-list a:hover {
  color: var(--accent-green);
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  max-width: var(--container-max);
  margin: clamp(24px, 4vw, 40px) auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--bg-line);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

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

.footer-bottom-sep {
  color: var(--accent-green);
}

.footer-bottom-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-refresh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent-green);
  background-color: rgba(57, 255, 20, 0.06);
  border: 1px solid rgba(57, 255, 20, 0.25);
}

.footer-refresh::before {
  content: '';
  width: 5px;
  height: 5px;
  background-color: var(--accent-green);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  display: grid;
  place-items: center;
  gap: 2px;
  width: 48px;
  height: 48px;
  padding: 0;
  background-color: var(--bg-panel);
  border: 1px solid var(--bg-line);
  color: var(--accent-green);
  cursor: pointer;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color 250ms var(--ease), border-color 250ms var(--ease), box-shadow 250ms var(--ease);
}

.back-top:hover {
  background-color: var(--bg-line);
  border-color: var(--accent-green);
  box-shadow: 0 0 24px rgba(57, 255, 20, 0.2);
}

.back-top-label {
  font-family: var(--font-data);
  font-size: 9px;
  letter-spacing: 0.18em;
}

/* ---------- 目录滚动跟随激活态 ---------- */
[data-scroll-spy].is-active {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background-color: rgba(57, 255, 20, 0.06);
}

/* ---------- 降低动效 ---------- */
@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;
  }
}