/* ==================================================================
   AOA体育官方主站 · 全局共享样式
   文件位置 /assets/site.css
   设计语言：竞速控制台 · Track Console
   ================================================================== */

/* ---------- 1. CSS 变量 ---------- */
:root {
  /* 色彩系统 */
  --c-deep: #0B1D3A;
  --c-green: #C6FF00;
  --c-orange: #FF6B00;
  --c-dark: #061229;
  --c-light: #F4F7FB;
  --c-txt-light: #E8F0FF;
  --c-txt-gray: #9AA8BF;
  --c-data: #1E5BFF;
  --c-glass: rgba(255, 255, 255, 0.12);
  --c-divider: #2C3A52;
  --c-body-text: #33415A;

  /* 字体 */
  --font-display: 'Impact', 'Arial Black', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', 'Cascadia Code', Consolas, 'Courier New', monospace;

  /* 间距 */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 2rem;
  --space-4: 3.5rem;
  --space-5: 5rem;

  /* 布局 */
  --container-w: 75rem;
  --header-h: 4.25rem;
  --radius: 2px;
  --grid-gap: 1.5rem;

  /* 阴影 */
  --shadow-green: 0 0 16px rgba(198, 255, 0, 0.35);
  --shadow-orange: 0 0 16px rgba(255, 107, 0, 0.35);
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 0.5rem);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-txt-light);
  background-color: var(--c-deep);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

main,
#main-content {
  display: block;
  flex: 1 0 auto;
}

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

ul,
ol {
  list-style: none;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

/* ---------- 3. 标题与正文 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  color: var(--c-txt-light);
  letter-spacing: 0.01em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.75rem, 7vw, 5rem);
  text-transform: uppercase;
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  text-transform: uppercase;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
}

h4 {
  font-size: 1.1rem;
}

p {
  margin-bottom: 1rem;
}

/* ---------- 4. 工具类 ---------- */
.u-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 3000;
  background: var(--c-green);
  color: var(--c-deep);
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-green);
  transition: top 0.2s ease;
}

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

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

/* ---------- 5. 内容容器与章节 ---------- */
.container {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-5);
}

.section--light {
  background: var(--c-light);
  color: var(--c-body-text);
}

.section--light h1,
.section--light h2,
.section--light h3,
.section--light h4,
.section--light h5,
.section--light h6 {
  color: var(--c-deep);
}

.section--light .lead {
  color: #4A5A72;
}

.section--dark {
  background: var(--c-dark);
}

.section--deep {
  background: var(--c-deep);
}

.section--glass {
  background:
    linear-gradient(rgba(11, 29, 58, 0.9), rgba(11, 29, 58, 0.9)),
    repeating-linear-gradient(135deg, transparent 0, transparent 14px, rgba(198, 255, 0, 0.06) 14px, rgba(198, 255, 0, 0.06) 16px);
}

/* ---------- 6. 网格 ---------- */
.grid {
  display: grid;
  gap: var(--grid-gap);
  grid-template-columns: 1fr;
}

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

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

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

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

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  padding: 0.8rem 1.7rem;
  color: var(--c-deep);
  background: var(--c-green);
  border: 2px solid var(--c-green);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  background: transparent;
  color: var(--c-green);
  box-shadow: var(--shadow-green);
}

.btn--orange {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: #FFFFFF;
  font-family: var(--font-mono);
}

.btn--orange:hover,
.btn--orange:focus-visible {
  background: transparent;
  color: var(--c-orange);
  box-shadow: var(--shadow-orange);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-divider);
  color: var(--c-txt-light);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--c-green);
  color: var(--c-green);
  box-shadow: none;
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
}

.section--light .btn--ghost {
  border-color: var(--c-deep);
  color: var(--c-deep);
}

/* ---------- 8. 标签、导语与数据 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-green);
  padding: 0.25rem 0.7rem;
  border: 1px solid rgba(198, 255, 0, 0.45);
  border-radius: 2px;
  margin-bottom: 1rem;
}

.section--light .eyebrow {
  color: var(--c-deep);
  border-color: rgba(11, 29, 58, 0.4);
}

.lead {
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--c-txt-gray);
  max-width: 46rem;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--c-txt-gray);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 0.25rem;
}

.section--light .stat-label {
  color: #6A7A92;
}

/* ---------- 9. 玻璃面板 ---------- */
.panel {
  background: var(--c-glass);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
  border-color: rgba(198, 255, 0, 0.5);
  box-shadow: 0 0 24px rgba(198, 255, 0, 0.08);
}

.section--light .panel {
  background: rgba(255, 255, 255, 0.65);
  border-color: rgba(11, 29, 58, 0.12);
}

/* ---------- 10. 图片容器 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-deep) 0%, var(--c-deep) 45%, var(--c-data) 100%);
  isolation: isolate;
}

.figure::before {
  content: '';
  display: block;
}

.figure--16x9::before { padding-top: 56.25%; }
.figure--4x3::before { padding-top: 75%; }
.figure--1x1::before { padding-top: 100%; }
.figure--21x9::before { padding-top: 42.85%; }

.figure__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.figure__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem 1rem 0.75rem;
  background: linear-gradient(to top, rgba(6, 18, 41, 0.9), transparent);
  font-size: 0.85rem;
  color: var(--c-txt-light);
  z-index: 2;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--c-txt-gray);
  padding-block: 1rem;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs__item {
  display: flex;
  align-items: center;
}

.breadcrumbs__item::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--c-divider);
}

.breadcrumbs__item:last-child::after {
  content: '';
}

.breadcrumbs a:hover {
  color: var(--c-green);
}

.breadcrumbs__current {
  color: var(--c-txt-light);
}

/* ---------- 12. 装饰性元素 ---------- */
.lane-strip {
  height: 6px;
  background: repeating-linear-gradient(
    115deg,
    var(--c-green) 0,
    var(--c-green) 10px,
    var(--c-dark) 10px,
    var(--c-dark) 18px
  );
}

.diag-cut {
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.5rem), 0 100%);
}

/* ---------- 13. 站头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 98px,
      rgba(255, 255, 255, 0.025) 98px,
      rgba(255, 255, 255, 0.025) 100px
    ),
    var(--c-deep);
}

.site-header::after {
  content: '';
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-green) 74%, var(--c-orange) 74%, var(--c-orange) 100%);
}

.site-header__inner {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: var(--header-h);
}

/* 品牌区 */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding-right: 1.5rem;
  border-right: 1px solid var(--c-divider);
}

.site-header__mark {
  position: relative;
  display: block;
  width: 1.9rem;
  height: 1.9rem;
  background: var(--c-green);
  border-radius: 3px;
  transform: rotate(45deg);
  box-shadow: var(--shadow-green);
  flex-shrink: 0;
}

.site-header__mark::before {
  content: '';
  position: absolute;
  inset: 6px;
  background: var(--c-deep);
  border-radius: 2px;
}

.site-header__mark::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: var(--c-orange);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.site-header__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-header__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--c-txt-light);
  white-space: nowrap;
}

.site-header__slogan {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--c-green);
  white-space: nowrap;
}

/* 移动端汉堡按钮 */
.site-header__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  background: transparent;
  border: 1px solid var(--c-divider);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.site-header__toggle:hover,
.site-header__toggle:focus-visible {
  border-color: var(--c-green);
}

.site-header__toggle-line {
  display: block;
  width: 1.375rem;
  height: 2px;
  background: var(--c-green);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

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

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

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

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

.site-nav__list {
  display: flex;
  align-items: stretch;
}

.site-nav__item + .site-nav__item {
  border-left: 1px solid var(--c-divider);
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 1.6rem 1.05rem;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--c-txt-light);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0.8rem;
  right: 0.8rem;
  height: 3px;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-orange) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--c-green);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-green);
}

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--c-txt-gray);
  letter-spacing: 0.08em;
  transition: color 0.2s ease;
}

.site-nav__link:hover .site-nav__num,
.site-nav__link[aria-current="page"] .site-nav__num {
  color: var(--c-orange);
}

/* 阅读进度条 */
.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  pointer-events: none;
  overflow: hidden;
}

.site-header__progress-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-green), var(--c-orange));
  box-shadow: 0 0 8px rgba(198, 255, 0, 0.6);
}

/* ---------- 14. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  background: var(--c-dark);
  color: var(--c-txt-light);
  border: 1px solid var(--c-divider);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease, border-color 0.2s ease;
}

.to-top.is-shown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--c-green);
  background: var(--c-deep);
}

.to-top__arrow {
  color: var(--c-green);
  font-size: 1rem;
  line-height: 1;
}

.to-top__label {
  color: var(--c-txt-gray);
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  top: 0;
  position: relative;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 98px,
      rgba(255, 255, 255, 0.018) 98px,
      rgba(255, 255, 255, 0.018) 100px
    ),
    var(--c-dark);
  color: var(--c-txt-light);
  flex-shrink: 0;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-green) 18%, var(--c-orange) 18%, var(--c-orange) 100%);
  z-index: 1;
}

.site-footer__main {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--space-4);
  padding-block: var(--space-5) var(--space-4);
}

.site-footer__intro {
  max-width: 34rem;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--c-txt-light);
}

.site-footer__slogan {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--c-green);
  margin-bottom: 1rem;
}

.site-footer__statement {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-txt-gray);
}

.site-footer__group {
  min-width: 0;
}

.site-footer__heading {
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-txt-light);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-divider);
  position: relative;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 2.5rem;
  height: 2px;
  background: var(--c-green);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.site-footer__links a {
  color: var(--c-txt-gray);
  font-size: 0.9rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
  position: relative;
  display: inline-block;
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--c-green);
  padding-left: 0.5rem;
}

.site-footer__links a::before {
  content: '→';
  position: absolute;
  left: -1rem;
  color: var(--c-orange);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.site-footer__links a:hover::before {
  opacity: 1;
}

.site-footer__contact-line {
  font-style: normal;
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--c-txt-gray);
}

.site-footer__service {
  font-size: 0.82rem;
  color: var(--c-txt-gray);
  margin-top: 0.8rem;
  line-height: 1.7;
}

.site-footer__bottom {
  border-top: 1px solid var(--c-divider);
  background: rgba(255, 255, 255, 0.02);
}

.site-footer__bottom-inner {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--c-txt-gray);
}

.site-footer__copyright {
  color: var(--c-txt-gray);
}

.site-footer__icp {
  letter-spacing: 0.04em;
}

/* ---------- 16. 移动端适配 ---------- */
@media (max-width: 1023px) {
  .site-header__inner {
    min-height: 3.75rem;
  }

  .site-header__brand {
    padding-right: 1rem;
    border-right: none;
  }

  .site-header__toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background: var(--c-dark);
    border-bottom: 3px solid var(--c-green);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    padding: 0.5rem 0;
  }

  .site-nav__item + .site-nav__item {
    border-left: none;
    border-top: 1px solid var(--c-divider);
  }

  .site-nav__link {
    padding: 1rem 1.5rem;
    justify-content: space-between;
    font-size: 1rem;
  }

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

  .site-nav__link[aria-current="page"] {
    border-left: 3px solid var(--c-green);
    background: rgba(198, 255, 0, 0.06);
  }

  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
    padding-block: var(--space-4) var(--space-3);
  }
}

@media (max-width: 767px) {
  .grid--2-1,
  .grid--1-2,
  .grid--3col {
    grid-template-columns: 1fr;
  }

  .section {
    padding-block: var(--space-4);
  }

  .site-footer__main {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__intro {
    grid-column: 1 / -1;
  }

  .to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 639px) {
  .grid--2col {
    grid-template-columns: 1fr;
  }

  .site-header__slogan {
    display: none;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* ---------- 17. 无障碍：减少动效 ---------- */
@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;
  }
}