/* ============================================================
   买球APP中文官方站 · 全站共享样式 site.css
   设计语言：侧边品牌轨道 / 展览标签 / 数据流动线 / 杂志封面
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #0F2B4C;
  --c-accent: #FF6A00;
  --c-dark: #071A2E;
  --c-paper: #F8F7F2;
  --c-white: #FFFFFF;
  --c-gray: #4A5568;
  --c-border: #D1D5DB;
  --c-accent-dark: #E05E00;
  --c-secondary: #2D4A6F;
  --c-text: #1A202C;

  --font-display: Impact, 'Arial Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;

  --header-w: 300px;
  --header-h: 64px;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 12px 32px rgba(7, 26, 46, 0.18);
  --container: 1120px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-paper);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--transition);
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
}

::selection {
  background: rgba(255, 106, 0, 0.28);
}

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

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  background: var(--c-accent);
  color: var(--c-dark);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  padding: 12px 20px;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(255, 106, 0, 0.4);
  transform: translateY(-160%);
  transition: transform var(--transition);
}

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

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--header-w);
  right: 0;
  height: 3px;
  z-index: 120;
  pointer-events: none;
  --progress: 0%;
  background: transparent;
}

.scroll-progress::before {
  content: '';
  position: absolute;
  inset: 0;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--c-accent), #FFB77A);
  box-shadow: 0 0 12px rgba(255, 106, 0, 0.5);
}

/* ---------- 头部：左侧品牌轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-w);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 28px 22px 20px;
  background-color: var(--c-primary);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 24px;
}

.brand-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--c-accent);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(255, 106, 0, 0.35);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  color: var(--c-dark);
  line-height: 1;
}

.brand-titles {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--c-white);
  white-space: nowrap;
}

.brand-slogan {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.62);
  letter-spacing: 0.04em;
  line-height: 1.5;
}

/* ---------- 导航：双层信息导航的下层栏目 ---------- */
.header-nav {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  border-left: 3px solid transparent;
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.nav-link:hover {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link:active {
  transform: translateX(2px);
}

.nav-link[aria-current="page"] {
  color: var(--c-white);
  background: rgba(255, 106, 0, 0.14);
  border-left-color: var(--c-accent);
  box-shadow: inset 0 0 0 1px rgba(255, 106, 0, 0.16);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent);
  opacity: 0.75;
  min-width: 22px;
  letter-spacing: 0.08em;
}

.nav-link[aria-current="page"] .nav-index {
  opacity: 1;
  color: var(--c-accent);
}

.nav-label {
  font-weight: 500;
}

/* ---------- 数据流动线 ---------- */
.rail-flow {
  position: relative;
  height: 3px;
  margin: 0 0 16px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.rail-flow::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 40%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
  transform: translateX(-150%) skewX(-20deg);
  animation: rail-flow 2.6s ease-in-out infinite;
}

@keyframes rail-flow {
  0% {
    transform: translateX(-150%) skewX(-20deg);
  }
  100% {
    transform: translateX(350%) skewX(-20deg);
  }
}

/* ---------- 头部状态区 ---------- */
.header-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.version-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  background: rgba(255, 106, 0, 0.15);
  border: 1px solid rgba(255, 106, 0, 0.35);
  color: var(--c-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 100px;
  white-space: nowrap;
}

.version-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(255, 106, 0, 0.9);
  animation: pulse-dot 2.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.55;
    transform: scale(0.82);
  }
}

.desktop-hint {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.5;
}

/* ---------- 移动端菜单按钮（桌面隐藏） ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  color: var(--c-white);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.toggle-text {
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

/* ---------- 主内容区 ---------- */
.site-main {
  margin-left: var(--header-w);
  min-height: 100vh;
  background: var(--c-paper);
}

.site-main:focus,
.site-main:focus-visible {
  outline: none;
}

.page-container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 48px;
}

.page-container--narrow {
  max-width: 840px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-left: var(--header-w);
  background: var(--c-dark);
  color: rgba(255, 255, 255, 0.72);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.72);
}

.site-footer a:hover {
  color: var(--c-accent);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.2fr 1.4fr;
  gap: 48px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 48px 40px;
}

.footer-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 8px;
  background: var(--c-accent);
  color: var(--c-dark);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  box-shadow: 0 4px 16px rgba(255, 106, 0, 0.3);
  margin-bottom: 16px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.05em;
  color: var(--c-white);
}

.footer-brand-slogan {
  color: var(--c-accent);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-top: 4px;
  font-size: 14px;
}

.footer-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.footer-heading::before {
  content: '// ';
}

.footer-section nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-section nav a {
  font-size: 14px;
}

.footer-contact-info {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 48px 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
}

.footer-copy {
  color: rgba(255, 255, 255, 0.46);
}

.footer-icp {
  font-family: var(--font-mono);
}

.footer-address {
  color: rgba(255, 255, 255, 0.4);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 96;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 100px;
  background: var(--c-primary);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--c-white);
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(7, 26, 46, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition), border-color var(--transition);
}

.back-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-dark);
}

.back-top-icon {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
}

.back-top-text {
  font-size: 13px;
  line-height: 1;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  margin-bottom: 32px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  font-size: 13px;
  color: var(--c-gray);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '→';
  margin-right: 8px;
  color: var(--c-border);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--c-primary);
  font-weight: 500;
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

.btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  box-shadow: 0 4px 14px rgba(255, 106, 0, 0.3);
}

.btn-primary:hover {
  background: var(--c-accent-dark);
  box-shadow: 0 6px 20px rgba(255, 106, 0, 0.4);
}

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

.btn-outline:hover {
  background: var(--c-primary);
  color: var(--c-white);
}

.btn-dark {
  background: var(--c-dark);
  color: var(--c-white);
}

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

/* ---------- 卡片 / 标签 / 栅格 / 展签 ---------- */
.section-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.section-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-primary);
  box-shadow: var(--shadow);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 100px;
  border: 1px solid var(--c-border);
  background: var(--c-white);
  color: var(--c-gray);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.tag-chip--accent {
  border-color: rgba(255, 106, 0, 0.4);
  color: var(--c-accent-dark);
  background: rgba(255, 106, 0, 0.08);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.mono-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gray);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mono-label::before {
  content: '//';
  color: var(--c-accent);
  font-weight: 700;
}

/* ---------- 无图图片槽 ---------- */
.visual-block {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background-color: var(--c-primary);
  overflow: hidden;
}

.visual-block--dark {
  background-color: var(--c-dark);
}

.visual-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg, transparent 0 12px, rgba(255, 255, 255, 0.05) 12px 13px, transparent 13px 26px),
    linear-gradient(120deg, rgba(255, 106, 0, 0.22), transparent 60%);
}

/* ---------- 标题排版 ---------- */
.display-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.08;
  color: var(--c-primary);
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

.display-sub {
  font-size: 18px;
  color: var(--c-gray);
  max-width: 34em;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 28px;
  color: var(--c-primary);
  letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--c-gray);
  font-size: 15px;
  max-width: 42em;
}

/* ---------- 响应式：平板 / 手机 ---------- */
@media (max-width: 1024px) {
  :root {
    --header-w: 0px;
  }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 0 20px;
  }

  .header-brand {
    padding-bottom: 0;
    border-bottom: none;
    margin-bottom: 0;
  }

  .brand-logo {
    width: 38px;
    height: 38px;
    font-size: 18px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    display: none;
  }

  .header-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    width: min(320px, 88vw);
    padding: 24px;
    background-color: var(--c-primary);
    background-image:
      linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: 28px 28px;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 12px 0 32px rgba(0, 0, 0, 0.22);
    transform: translateX(-105%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  .header-meta {
    margin-left: auto;
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .desktop-hint {
    display: none;
  }

  .version-tag {
    font-size: 11px;
    padding: 4px 10px;
  }

  .rail-flow {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-main,
  .site-footer {
    margin-left: 0;
  }

  .scroll-progress {
    left: 0;
  }

  .page-container {
    padding: 40px 20px;
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .brand-name {
    font-size: 16px;
  }

  .brand-logo {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .version-tag {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .page-container {
    padding: 28px 16px;
  }

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

  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 20px 32px;
  }

  .footer-sections {
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 16px 20px 24px;
    justify-content: flex-start;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
  }

  .display-title {
    font-size: 36px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

  .rail-flow::before,
  .version-dot {
    animation: none;
  }
}