/* ==========================================================================
   维基体育中国站 共享样式
   结构：变量 / 重置 / 排版 / 无障碍 / 布局 / 头部与导航 / 按钮 / 面包屑 /
         章节标题 / 色带 / 卡片与数据 / 媒体占位 / 页脚 / 响应式 / 动效偏好
   ========================================================================== */

/* 1. 设计变量 */
:root {
  --cream: #F5F0E6;
  --ink: #1C1C1A;
  --blue: #004173;
  --green: #39FF14;
  --orange: #FF4500;
  --gray: #8A8678;
  --khaki: #D9D0B8;
  --brown: #3D2B1F;

  --bg: var(--cream);
  --text: var(--ink);
  --border: rgba(28, 28, 26, 0.14);
  --border-soft: rgba(245, 240, 230, 0.14);

  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --header-h: 64px;
  --sidebar-w: 280px;
  --container-w: 1200px;
  --ease: cubic-bezier(0.33, 1, 0.68, 1);
  --speed: 0.25s;
}

/* 2. 重置与基础 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

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

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

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

a {
  color: inherit;
}

::selection {
  background: var(--green);
  color: var(--ink);
}

/* 3. 中文排版 */
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  padding-top: var(--header-h);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font);
  font-weight: 900;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: clamp(32px, 4.5vw, 56px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p {
  max-width: 68ch;
}

.site-main a:not([class]) {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.site-main a:not([class]):hover {
  color: var(--orange);
}

/* 4. 无障碍 */
:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--green);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 2px;
  transform: translateY(-160%);
  transition: transform var(--speed) var(--ease);
}

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

/* 5. 布局容器 */
.site-main {
  min-height: 70vh;
}

#main-content,
.main-content {
  scroll-margin-top: calc(var(--header-h) + 16px);
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.page-container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 24px 88px;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 24px;
  margin: 28px 0;
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

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

/* 6. 头部与侧边轨道导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--blue);
  color: var(--cream);
  border-bottom: 1px solid var(--border-soft);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  background: var(--green);
  color: var(--blue);
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 900;
  border-radius: 2px;
  transform: skewX(-8deg);
}

.brand-name {
  font-size: 18px;
  font-weight: 900;
  line-height: 1.15;
  color: var(--cream);
  letter-spacing: 0.02em;
}

.brand-name em {
  display: block;
  font-style: normal;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: rgba(245, 240, 230, 0.68);
}

.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  color: var(--cream);
  font-size: 13px;
  font-weight: 700;
}

.nav-toggle-box {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 16px;
}

.nav-toggle-box i {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: 1px;
  background: var(--cream);
  transition: transform var(--speed) var(--ease), opacity var(--speed);
}

.nav-toggle-box i:nth-child(1) { top: 0; }
.nav-toggle-box i:nth-child(2) { top: 7px; }
.nav-toggle-box i:nth-child(3) { top: 14px; }

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

.site-header[data-open] .nav-toggle-box i:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-text {
  color: var(--green);
}

.site-header::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  background: rgba(28, 28, 26, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--speed), visibility var(--speed);
}

.site-header[data-open]::after {
  opacity: 1;
  visibility: visible;
}

.nav-panel {
  position: fixed;
  top: var(--header-h);
  bottom: 0;
  left: 0;
  z-index: 2;
  width: min(36rem, 86vw);
  display: flex;
  flex-direction: column;
  padding: 32px 24px 40px;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--blue) 0%, #00294d 100%);
  box-shadow: 8px 0 24px rgba(0, 0, 0, 0.28);
  transform: translateX(-105%);
  visibility: hidden;
  transition: transform 0.3s var(--ease), visibility 0.3s;
}

.site-header[data-open] .nav-panel {
  transform: translateX(0);
  visibility: visible;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 14px;
  color: rgba(245, 240, 230, 0.82);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background var(--speed), border-color var(--speed), color var(--speed);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--cream);
  border-left-color: var(--green);
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.14), rgba(57, 255, 20, 0));
}

.nav-link[aria-current="page"] {
  color: var(--cream);
  font-weight: 700;
  border-left-color: var(--green);
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.2), rgba(57, 255, 20, 0));
}

.nav-index {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--green);
  opacity: 0.65;
}

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

.nav-name {
  flex: 1;
}

.nav-tools {
  margin-top: auto;
  padding-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.search-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(245, 240, 230, 0.24);
  color: var(--cream);
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--speed), background var(--speed);
}

.search-entry:hover,
.search-entry:focus-visible {
  border-color: var(--green);
  background: rgba(57, 255, 20, 0.08);
}

.search-icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  border: 2px solid var(--green);
  border-radius: 50%;
}

.search-icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -4px;
  width: 7px;
  height: 2px;
  background: var(--green);
  transform: rotate(45deg);
}

.search-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.search-tip {
  font-size: 11px;
  color: rgba(245, 240, 230, 0.6);
}

.nav-lang {
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 240, 230, 0.55);
}

.header-progress,
[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 150;
  height: 3px;
  background: rgba(245, 240, 230, 0.22);
  pointer-events: none;
}

.header-progress span,
[data-scroll-progress] span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--green);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.5);
  transform: scaleX(0);
  transform-origin: 0 0;
}

/* 桌面端侧边轨道 */
@media (min-width: 1024px) {
  body {
    padding-top: 0;
    padding-left: var(--sidebar-w);
  }

  #main-content,
  .main-content {
    scroll-margin-top: 24px;
  }

  .site-header {
    right: auto;
    width: var(--sidebar-w);
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    border-right: 1px solid var(--border-soft);
    border-bottom: 0;
    background: linear-gradient(180deg, #00294d 0%, var(--blue) 100%);
  }

  .site-header::after {
    display: none;
  }

  .brand-link {
    align-items: flex-start;
    gap: 12px;
    padding: 44px 32px 28px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
    font-size: 22px;
  }

  .brand-name {
    font-size: 21px;
  }

  .brand-name em {
    font-size: 12px;
  }

  .nav-toggle {
    display: none;
  }

  .nav-panel {
    position: static;
    flex: 1;
    width: auto;
    top: auto;
    bottom: auto;
    left: auto;
    padding: 40px 22px 40px;
    overflow: visible;
    background: transparent;
    box-shadow: none;
    transform: none;
    visibility: visible;
  }

  .nav-link {
    padding: 13px 16px;
  }
}

/* 移动端抽屉打开时锁定背景滚动 */
@media (max-width: 1023px) {
  body:has(.site-header[data-open]) {
    overflow: hidden;
  }
}

/* 7. 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--speed), color var(--speed), border-color var(--speed), transform var(--speed);
}

.btn::after {
  content: "→";
  transition: transform var(--speed) var(--ease);
}

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

.btn:hover::after {
  transform: translateX(4px);
}

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

.btn-primary {
  background: var(--green);
  color: var(--ink);
}

.btn-primary:hover {
  background: var(--cream);
}

.btn-ghost {
  border-color: rgba(245, 240, 230, 0.4);
  color: var(--cream);
}

.btn-ghost:hover {
  border-color: var(--green);
  color: var(--green);
}

.btn-block {
  width: 100%;
}

/* 8. 面包屑 */
.crumb {
  padding: 20px 0 0;
}

.crumb-list {
  display: flex;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--gray);
}

.crumb-list li {
  display: inline-flex;
  align-items: center;
}

.crumb-list li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--khaki);
  font-weight: 700;
}

.crumb-list a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 500;
}

.crumb-list a:hover {
  color: var(--orange);
}

.crumb-list [aria-current="page"] {
  color: var(--ink);
}

/* 9. 章节标题 */
.section-head {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 72px 0 28px;
}

.section-head::after {
  content: "";
  flex: 1;
  height: 1px;
  margin-left: 24px;
  background: linear-gradient(90deg, var(--khaki), transparent);
}

.section-index {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  line-height: 1;
  padding: 6px 14px;
  color: var(--blue);
  background: var(--khaki);
  border-left: 4px solid var(--green);
  transform: skewX(-8deg);
}

.section-title {
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.section-desc {
  margin-top: 10px;
  font-size: 15px;
  color: var(--gray);
  max-width: 56ch;
}

.rule-line {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: linear-gradient(90deg, var(--ink) 0 48px, var(--khaki) 48px);
}

/* 10. 横向色带 */
.band {
  position: relative;
  width: 100%;
  margin: 40px 0;
  padding: 44px 0;
  overflow: hidden;
}

.band::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(-18deg, transparent 0 16px, rgba(255, 255, 255, 0.07) 16px 17px);
}

.band > * {
  position: relative;
  z-index: 1;
}

.band-blue {
  background: var(--blue);
  color: var(--cream);
}

.band-green {
  background: var(--green);
  color: var(--ink);
}

.band-ink {
  background: var(--ink);
  color: var(--cream);
}

.band-blue .section-title,
.band-ink .section-title {
  color: var(--cream);
}

.band .section-index {
  color: var(--cream);
  background: rgba(245, 240, 230, 0.16);
  border-left-color: var(--green);
}

/* 11. 卡片与数据 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin: 28px 0;
}

.data-card {
  position: relative;
  padding: 24px;
  background: var(--cream);
  border: 1px solid var(--khaki);
  box-shadow: 0 1px 0 rgba(28, 28, 26, 0.05);
  transition: border-color var(--speed), box-shadow var(--speed), transform var(--speed);
}

.data-card:hover {
  border-color: var(--green);
  box-shadow: 3px 3px 0 rgba(28, 28, 26, 0.08);
  transform: translateY(-2px);
}

.card-title {
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.card-meta {
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--gray);
}

.data-label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
}

.data-value {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.1;
  color: var(--blue);
}

.data-value small {
  font-size: 0.55em;
  font-weight: 700;
  color: var(--gray);
}

.tag-hot {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  background: rgba(255, 69, 0, 0.1);
  border: 1px solid rgba(255, 69, 0, 0.32);
}

.live-dot {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2);
  animation: livePulse 2s infinite var(--ease);
}

@keyframes livePulse {
  0% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.35); }
  70% { box-shadow: 0 0 0 8px rgba(57, 255, 20, 0); }
  100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0); }
}

/* 12. 首屏章节预览 */
.page-hero {
  padding: clamp(32px, 6vw, 72px) 0 24px;
}

.hero-kicker {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.hero-title {
  margin-top: 8px;
  font-size: clamp(38px, 7vw, 80px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero-meta {
  margin-top: 16px;
  font-size: 15px;
  color: var(--gray);
  max-width: 62ch;
}

.hero-preview {
  margin-top: clamp(32px, 5vw, 56px);
}

.preview-list {
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.preview-item {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 8px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--khaki);
  transition: padding var(--speed) var(--ease), background var(--speed), border-color var(--speed);
}

.preview-item:last-child {
  border-bottom: 0;
}

.preview-item:hover {
  padding-left: 18px;
  background: linear-gradient(90deg, rgba(0, 65, 115, 0.07), transparent);
  border-bottom-color: var(--green);
}

.preview-index {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
}

.preview-name {
  flex: 1;
  font-weight: 700;
}

.preview-meta {
  font-size: 12px;
  color: var(--gray);
}

.preview-arrow {
  font-family: var(--mono);
  color: var(--orange);
  transition: transform var(--speed) var(--ease);
}

.preview-item:hover .preview-arrow {
  transform: translateX(4px);
}

/* 13. 媒体占位 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--khaki);
  border: 1px solid rgba(28, 28, 26, 0.08);
}

.media-frame[data-ratio="4/3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="3/2"] { aspect-ratio: 3 / 2; }
.media-frame[data-ratio="1/1"] { aspect-ratio: 1 / 1; }

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(-18deg, transparent 0 12px, rgba(28, 28, 26, 0.04) 12px 13px),
    linear-gradient(135deg, rgba(0, 65, 115, 0.08), rgba(217, 208, 184, 0.35));
}

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

.media-frame::after {
  content: attr(data-label);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 3px 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cream);
  background: var(--ink);
  opacity: 0.85;
}

.media-frame:not([data-label])::after {
  display: none;
}

/* 14. 视觉纹理 */
.streak {
  position: relative;
}

.streak::after {
  content: "";
  position: absolute;
  right: -24px;
  top: 50%;
  width: 96px;
  height: 8px;
  background: linear-gradient(90deg, var(--orange), transparent);
  filter: blur(2px);
  opacity: 0.7;
  transform: translateY(-50%);
}

/* 15. 页脚 */
.site-footer {
  margin-top: 96px;
  background: var(--brown);
  color: rgba(245, 240, 230, 0.78);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px 24px 40px;
}

.footer-logo {
  display: inline-flex;
  flex-direction: column;
  font-size: 26px;
  font-weight: 900;
  line-height: 1.15;
  color: var(--cream);
  text-decoration: none;
}

.footer-logo em {
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--green);
}

.footer-trust {
  margin-top: 14px;
  max-width: 44ch;
  font-size: 13px;
  color: rgba(245, 240, 230, 0.6);
}

.footer-title {
  display: inline-block;
  margin-bottom: 14px;
  padding-bottom: 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cream);
  border-bottom: 2px solid var(--orange);
}

.footer-nav a {
  display: block;
  padding: 4px 0;
  color: rgba(245, 240, 230, 0.72);
  text-decoration: none;
  transition: color var(--speed), padding var(--speed);
}

.footer-nav a::before {
  content: "› ";
  color: var(--green);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--green);
  padding-left: 4px;
}

.footer-contact p {
  margin: 4px 0;
  color: rgba(245, 240, 230, 0.72);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 18px 24px;
  border-top: 1px solid rgba(245, 240, 230, 0.14);
  font-size: 12px;
  color: rgba(245, 240, 230, 0.55);
}

/* 16. 响应式页面网格增强 */
@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

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

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 48px;
    padding: 72px 32px 48px;
  }

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

/* 17. 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .live-dot {
    animation: none;
  }
}