/* ==========================================================================
   易倍赛事入口 — 全站共享样式 /assets/site.css
   1. 重置与 CSS 变量
   2. 基础排版
   3. 工具类
   4. 容器 / 区段 / 网格
   5. 按钮系统
   6. 面包屑
   7. 页头
   8. 导航与移动抽屉
   9. 滚动进度
   10. 页脚
   11. 卡片与数据组件
   12. 徽标与状态
   13. 排名表
   14. 章节目录
   15. 图片容器
   16. 时间线
   17. 索引地图
   18. 返回顶部
   19. 响应式细化
   20. 动效偏好
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 重置与 CSS 变量
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #F5F7FA;
  --color-dark: #0A1F44;
  --color-dark-variant: #132B56;
  --color-dark-deep: #061632;
  --color-accent: #FF6B00;
  --color-accent-light: #FF9A4D;
  --color-blue-soft: #3E5C8A;
  --color-gray: #6B7280;
  --color-white: #FFFFFF;
  --color-line: rgba(62, 92, 138, 0.22);

  --font-head: "Oswald", "Impact", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Roboto", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-data: "Courier New", "Courier", "Consolas", monospace;

  --fs-hero: clamp(2.5rem, 6vw, 4.5rem);
  --fs-section: clamp(2rem, 4vw, 3rem);
  --fs-card: clamp(1.25rem, 2vw, 1.75rem);
  --fs-body: 1rem;
  --fs-number: clamp(2rem, 4vw, 3.5rem);
  --fs-caption: 0.875rem;

  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius: 4px;
  --radius-card: 8px;
  --shadow-card: 0 4px 20px rgba(10, 31, 68, 0.08);
  --shadow-nav: 0 4px 24px rgba(10, 31, 68, 0.2);

  --header-h: 76px;
  --max-w: 1280px;

  --transition-fast: 0.2s ease;
  --transition-med: 0.3s ease;
}

/* --------------------------------------------------------------------------
   2. 基础排版
   -------------------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-dark);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-dark);
  letter-spacing: 0.02em;
}

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-blue-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

ul, ol {
  padding-left: 0;
}

button,
input {
  font-family: inherit;
  font-size: inherit;
}

textarea,
input {
  appearance: none;
  -webkit-appearance: none;
}

/* --------------------------------------------------------------------------
   3. 工具类
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.text-accent {
  color: var(--color-accent);
}

.text-dark {
  color: var(--color-dark);
}

.text-muted {
  color: var(--color-gray);
}

.page-lead {
  padding-top: var(--header-h);
}

.hero-under-header {
  margin-top: calc(var(--header-h) * -1);
  padding-top: var(--header-h);
}

/* --------------------------------------------------------------------------
   4. 容器 / 区段 / 网格
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: var(--space-xl) 0;
}

.section-sm {
  padding: var(--space-lg) 0;
}

.section-lg {
  padding: var(--space-2xl) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-section);
  line-height: 1.15;
  color: var(--color-dark);
  text-transform: uppercase;
}

.section-desc {
  margin-top: 0.75rem;
  color: var(--color-gray);
  line-height: 1.8;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 900px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   5. 按钮系统
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  line-height: 1.2;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 4px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              background-color var(--transition-fast),
              color var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(255, 107, 0, 0.35);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
}

.btn-accent:hover {
  background: #E05F00;
  box-shadow: 0 6px 24px rgba(255, 107, 0, 0.45);
}

.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(10, 31, 68, 0.3);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
}

.btn-dark:hover {
  background: var(--color-dark-variant);
}

.btn-outline {
  background: transparent;
  color: var(--color-dark);
  border: 1px solid var(--color-line);
}

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

.btn-lg {
  font-size: 0.95rem;
  padding: 0.85rem 2rem;
}

.btn-sm {
  font-size: 0.72rem;
  padding: 0.4rem 0.85rem;
}

.btn-rank {
  font-size: 0.75rem;
  padding: 0.5rem 1rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}

/* --------------------------------------------------------------------------
   6. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.5rem;
  color: var(--color-gray);
}

.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-blue-soft);
  opacity: 0.5;
}

.breadcrumb-list a {
  color: var(--color-blue-soft);
  text-decoration: none;
}

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

.breadcrumb-list [aria-current="page"] {
  color: var(--color-dark);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   7. 页头
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(180deg,
              rgba(10, 31, 68, 0.55) 0%,
              rgba(10, 31, 68, 0.25) 70%,
              rgba(10, 31, 68, 0) 100%);
  transition: background var(--transition-med),
              box-shadow var(--transition-med);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg,
              var(--color-accent) 0%,
              rgba(62, 92, 138, 0.25) 100%);
  opacity: 0.55;
  transition: opacity var(--transition-med);
}

.site-header.is-scrolled {
  background: rgba(10, 31, 68, 0.97);
  box-shadow: var(--shadow-nav);
}

.site-header.is-scrolled::after {
  opacity: 1;
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  padding: 7px;
  background: var(--color-accent);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
  flex-shrink: 0;
}

.brand-icon-bar {
  display: block;
  width: 4px;
  background: var(--color-white);
}

.brand-icon-bar-1 {
  height: 9px;
  opacity: 0.75;
}

.brand-icon-bar-2 {
  height: 14px;
  opacity: 0.9;
}

.brand-icon-bar-3 {
  height: 20px;
}

.brand-titles {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--color-white);
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(255, 255, 255, 0.68);
  margin-top: 0.15rem;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  transition: background var(--transition-fast),
              border-color var(--transition-fast);
}

.search-box:focus-within {
  background: rgba(255, 255, 255, 0.22);
  border-color: var(--color-accent);
}

.search-icon {
  position: relative;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.75);
  border-radius: 50%;
  flex-shrink: 0;
}

.search-icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 7px;
  height: 2px;
  background: rgba(255, 255, 255, 0.75);
  transform: rotate(45deg);
  border-radius: 1px;
}

.search-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-white);
  font-size: 0.8rem;
  width: 160px;
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.55);
  opacity: 1;
}

.search-input::-webkit-search-cancel-button {
  filter: invert(1);
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   8. 导航与移动抽屉
   -------------------------------------------------------------------------- */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}

.nav-link {
  position: relative;
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  padding: 0.5rem 0.85rem;
  border-radius: 4px;
  transition: background var(--transition-fast),
              color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

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

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.1rem;
  height: 3px;
  background: var(--color-accent);
  clip-path: polygon(0 40%, 100% 0, calc(100% - 6px) 100%, 6px 100%);
}

.nav-cta {
  display: none;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-cta .btn {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  cursor: pointer;
  padding: 10px;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-med),
              opacity var(--transition-med);
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-scrim {
  display: none;
}

@media (max-width: 960px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .search-box,
  .btn-rank {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background: var(--color-dark-variant);
    z-index: 999;
    padding: calc(var(--header-h) + 1.5rem) 1.5rem 2rem;
    transform: translateX(100%);
    transition: transform var(--transition-med);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    overflow-y: auto;
    display: block;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .nav-link {
    font-size: 1rem;
    padding: 0.85rem 1rem;
  }

  .nav-link[aria-current="page"]::after {
    left: 1rem;
    right: auto;
    width: 28px;
  }

  .nav-cta {
    display: block;
  }

  .nav-scrim[data-open] {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(10, 31, 68, 0.55);
    z-index: 998;
  }
}

/* --------------------------------------------------------------------------
   9. 滚动进度
   -------------------------------------------------------------------------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1200;
  pointer-events: none;
  background: transparent;
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* --------------------------------------------------------------------------
   10. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: var(--space-2xl);
  background: var(--color-dark-deep);
  color: rgba(255, 255, 255, 0.72);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg,
              var(--color-accent) 0%,
              var(--color-accent-light) 40%,
              transparent 100%);
}

.footer-top {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-2xl) 1.5rem var(--space-xl);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2.5rem;
  align-items: start;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  margin-bottom: 1rem;
}

.footer-brand-icon {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  width: 32px;
  height: 32px;
  padding: 5px;
  background: var(--color-accent);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 100%, 6px 100%);
}

.footer-brand-icon .brand-icon-bar {
  width: 3px;
}

.footer-brand-icon .brand-icon-bar-1 {
  height: 7px;
}

.footer-brand-icon .brand-icon-bar-2 {
  height: 12px;
}

.footer-brand-icon .brand-icon-bar-3 {
  height: 18px;
}

.footer-brand-name {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.06em;
}

.footer-brief {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
  max-width: 300px;
  margin-bottom: 1rem;
}

.footer-trust {
  font-size: 0.78rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.42);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 0.85rem;
  max-width: 320px;
}

.footer-heading {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-white);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  position: relative;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--color-accent);
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link-list a {
  color: rgba(255, 255, 255, 0.62);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast),
              padding-left var(--transition-fast);
}

.footer-link-list a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-contact-line {
  font-size: 0.875rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.62);
}

.footer-contact-note {
  margin-top: 0.85rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.42);
  border-left: 3px solid var(--color-accent);
  padding-left: 0.75rem;
  max-width: 260px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.25);
}

.footer-bottom-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.footer-copy,
.footer-icp {
  color: rgba(255, 255, 255, 0.45);
}

.footer-social {
  display: flex;
  gap: 0.5rem;
}

.social-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 6px;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.6);
  cursor: default;
  user-select: none;
}

.footer-disclaimer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem 1rem;
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.3);
  text-align: center;
}

@media (max-width: 1100px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .footer-top {
    grid-template-columns: 1fr;
    padding: var(--space-xl) 1.25rem;
  }

  .footer-brand-col {
    grid-column: auto;
  }

  .footer-bottom-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    padding: 1rem 1.25rem;
  }

  .footer-disclaimer {
    padding: 0 1.25rem 1rem;
    text-align: left;
  }
}

/* --------------------------------------------------------------------------
   11. 卡片与数据组件
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
  transition: transform var(--transition-med),
              box-shadow var(--transition-med);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(10, 31, 68, 0.12);
}

.card-dark {
  background: var(--color-dark);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-card);
  box-shadow: 0 8px 30px rgba(10, 31, 68, 0.25);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.card-dark::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background: repeating-linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.05) 0 2px,
    transparent 2px 8px
  );
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  pointer-events: none;
}

.card-dark .data-number {
  color: var(--color-white);
}

.card-dark .data-label {
  color: rgba(255, 255, 255, 0.6);
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.25rem;
}

.data-cell {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.data-number {
  font-family: var(--font-data);
  font-size: var(--fs-number);
  font-weight: 500;
  color: var(--color-dark);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.data-number[data-accent] {
  color: var(--color-accent);
}

.data-label {
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  color: var(--color-gray);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   12. 徽标与状态
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 107, 0, 0.12);
  color: var(--color-accent);
  border: 1px solid rgba(255, 107, 0, 0.25);
  white-space: nowrap;
}

.badge-dark {
  background: rgba(10, 31, 68, 0.08);
  color: var(--color-dark);
  border-color: rgba(10, 31, 68, 0.15);
}

.badge-live .badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 1.5s ease-in-out infinite;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.75);
  }
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-blue-soft);
  background: rgba(62, 92, 138, 0.08);
  border: 1px solid rgba(62, 92, 138, 0.15);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  margin: 0 0.4rem 0.4rem 0;
}

/* --------------------------------------------------------------------------
   13. 排名表
   -------------------------------------------------------------------------- */
.standings-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.standings-card .card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--color-dark);
}

.standings-card .card-head-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
}

.standings-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.standings-table th {
  background: var(--color-dark-variant);
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.55rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.standings-table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--color-line);
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.standings-table tr:last-child td {
  border-bottom: none;
}

.standings-table tbody tr {
  transition: background var(--transition-fast);
}

.standings-table tbody tr:hover {
  background: rgba(255, 107, 0, 0.05);
}

.standings-table .rank-up {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   14. 章节目录
   -------------------------------------------------------------------------- */
.chapter-dir {
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 1.25rem;
  max-height: calc(100vh - var(--header-h) - 3rem);
  overflow-y: auto;
}

.chapter-dir-title {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-dark);
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-line);
}

.chapter-dir-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.chapter-dir-list a {
  display: flex;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-blue-soft);
  text-decoration: none;
  padding: 0.45rem 0.6rem;
  border-radius: 4px;
  border-left: 3px solid transparent;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

.chapter-dir-list a::before {
  content: "◆";
  font-size: 0.4rem;
  margin-right: 0.5rem;
  color: var(--color-accent);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
}

.chapter-dir-list a:hover {
  background: rgba(255, 107, 0, 0.06);
  color: var(--color-dark);
}

.chapter-dir-list a[aria-current="true"] {
  background: rgba(255, 107, 0, 0.08);
  color: var(--color-dark);
  font-weight: 700;
  border-left-color: var(--color-accent);
}

.chapter-dir-list a[aria-current="true"]::before {
  opacity: 1;
  transform: translateX(0);
}

.chapter-dir-progress {
  margin-top: 1rem;
  height: 4px;
  border-radius: 2px;
  background: var(--color-line);
  overflow: hidden;
}

.chapter-dir-progress span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* --------------------------------------------------------------------------
   15. 图片容器
   -------------------------------------------------------------------------- */
.img-container {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--color-dark-variant);
  aspect-ratio: 16 / 9;
}

.img-container > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-med);
}

.img-container:hover > img {
  transform: scale(1.03);
}

.img-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.55);
  background:
    linear-gradient(135deg, var(--color-dark-variant) 0%, var(--color-dark) 100%);
}

.img-placeholder::before {
  content: "";
  width: 36px;
  height: 36px;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.img-placeholder::after {
  content: "IMAGE";
  font-size: 0.7rem;
  letter-spacing: 0.25em;
}

/* 16:10 变体 */
.img-container-wide {
  aspect-ratio: 16 / 10;
}

/* 4:3 变体 */
.img-container-portrait {
  aspect-ratio: 4 / 3;
}

/* --------------------------------------------------------------------------
   16. 时间线
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-line);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-white);
  border: 3px solid var(--color-accent);
}

.timeline-date {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-blue-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.timeline-title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-top: 0.2rem;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-top: 0.3rem;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   17. 索引地图
   -------------------------------------------------------------------------- */
.index-map {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.map-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 1.25rem;
  position: relative;
  transition: transform var(--transition-med),
              box-shadow var(--transition-med);
}

.map-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(10, 31, 68, 0.12);
}

.map-card-number {
  display: block;
  font-family: var(--font-data);
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
  line-height: 1;
}

.map-card-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-dark);
}

.map-card-desc {
  font-size: 0.8rem;
  color: var(--color-gray);
  margin-top: 0.25rem;
  line-height: 1.5;
}

@media (max-width: 900px) {
  .index-map {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .index-map {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   18. 返回顶部
   -------------------------------------------------------------------------- */
.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 44px;
  height: 44px;
  background: var(--color-dark);
  color: var(--color-white);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity var(--transition-med),
              transform var(--transition-med),
              background-color var(--transition-fast);
  z-index: 950;
  box-shadow: 0 4px 20px rgba(10, 31, 68, 0.3);
}

.back-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-top:hover {
  background: var(--color-accent);
  box-shadow: 0 6px 24px rgba(255, 107, 0, 0.4);
}

.back-top-icon {
  display: block;
  width: 12px;
  height: 12px;
  border-top: 3px solid var(--color-white);
  border-left: 3px solid var(--color-white);
  transform: rotate(45deg);
  margin-bottom: 4px;
}

/* --------------------------------------------------------------------------
   19. 响应式细化
   -------------------------------------------------------------------------- */
@media (max-width: 1120px) {
  .search-box {
    display: none;
  }
}

@media (max-width: 480px) {
  .brand {
    gap: 0.5rem;
  }

  .brand-subtitle {
    display: none;
  }

  .brand-title {
    font-size: 1rem;
  }

  .brand-icon {
    width: 34px;
    height: 34px;
    padding: 6px;
  }
}

/* --------------------------------------------------------------------------
   20. 动效偏好与焦点
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: -48px;
  left: 1rem;
  z-index: 1200;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  text-decoration: none;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(255, 107, 0, 0.4);
  transition: top var(--transition-med);
}

.skip-link:focus {
  top: 1rem;
}

@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;
  }

  .card:hover,
  .map-card:hover,
  .img-container:hover > img {
    transform: none;
  }
}