/* ============================================================
   28体育 · 共享站点样式 /assets/site.css
   深墨蓝底 · 荧光青 × 电光橙 · 锐利直角 · 精密网格
   ============================================================ */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body,
h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0A1521;
  --ink-2: #12243A;
  --line: #2A3F55;
  --cyan: #35E6D2;
  --cyan-deep: #0E7A73;
  --orange: #FF6B33;
  --paper: #F3EFE6;
  --mist: #8FA3B8;
  --amber: #FFC24B;
  --green: #6FE39A;

  --font-sans: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --step-0: clamp(15px, 1.05vw, 17px);
  --step-1: 20px;
  --step-2: clamp(24px, 2.8vw, 32px);
  --step-3: clamp(30px, 4.2vw, 48px);
  --step-4: clamp(44px, 7vw, 118px);

  --gutter: clamp(20px, 4vw, 64px);
  --shell-max: 1480px;
  --header-h: 78px;

  --dur: 180ms;
  --ease: cubic-bezier(.2, .6, .2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 calc(100% / 12 - 1px),
    rgba(42, 63, 85, .22) calc(100% / 12 - 1px) calc(100% / 12)
  );
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: .98;
  letter-spacing: -.015em;
  text-align: left;
  font-stretch: condensed;
}
h1 { font-size: var(--step-4); font-weight: 200; line-height: .92; letter-spacing: -.02em; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); line-height: 1.15; }
h4 { font-size: var(--step-1); line-height: 1.3; font-weight: 500; }

p { max-width: 68ch; }
small { font-size: 12px; }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

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

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

html.nav-open { overflow: hidden; }

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 112px); }
.section--tight { padding-block: clamp(28px, 4vw, 64px); }

.rule {
  height: 1px;
  width: 100%;
  background: var(--line);
  margin: 0;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 22px;
}

.prose { max-width: 68ch; }
.prose p { color: var(--mist); margin-bottom: 1.1em; }
.prose p:last-child { margin-bottom: 0; }
.prose h3 { color: var(--paper); margin-block: 2em .6em; }
.prose a {
  color: var(--paper);
  border-bottom: 1px solid var(--cyan);
}
.prose a:hover { color: var(--cyan); }
.prose ul { margin-bottom: 1.1em; }
.prose li {
  color: var(--mist);
  padding-left: 18px;
  position: relative;
  margin-bottom: .4em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 8px;
  height: 1px;
  background: var(--line);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 1.6vw, 24px);
}
.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-8  { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .col-3, .col-4, .col-5, .col-6 { grid-column: span 6; }
  .col-7, .col-8 { grid-column: span 12; }
}
@media (max-width: 600px) {
  .grid-12 > * { grid-column: span 12; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6em;
  min-height: 44px;
  padding: 11px 20px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 700;
}
.btn--primary:hover { background: #ff8455; border-color: #ff8455; }
.btn--primary:active { background: #e2561f; border-color: #e2561f; }
.btn--ghost { color: var(--paper); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------- 6. 标签与卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: .08em;
  border-radius: 0;
  white-space: nowrap;
}
.tag--warn { border-color: rgba(255, 194, 75, .5); color: var(--amber); background: rgba(255, 194, 75, .08); }
.tag--ok   { border-color: rgba(111, 227, 154, .5); color: var(--green); background: rgba(111, 227, 154, .08); }
.tag--live { border-color: rgba(255, 107, 51, .55); color: var(--orange); background: rgba(255, 107, 51, .1); }
.tag--info { border-color: rgba(53, 230, 210, .45); color: var(--cyan); background: rgba(53, 230, 210, .08); }

.card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: clamp(18px, 2vw, 28px);
  transition: border-color var(--dur) var(--ease);
}
.card:hover { border-color: var(--cyan); }
.card__title {
  font-size: var(--step-1);
  font-weight: 500;
  color: var(--paper);
  margin-bottom: .5em;
}

/* ---------- 7. 图片容器基础 ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--ink-2);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(42, 63, 85, .55) 0 1px,
    transparent 1px 11px
  );
  border: 1px solid var(--line);
  border-radius: 0;
}
.media > img,
.media > picture,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media > picture { display: block; height: 100%; }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(10, 21, 33, 0) 42%, rgba(10, 21, 33, .88) 100%);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--plain::after { display: none; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
}
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li + li::before {
  content: "/";
  padding-inline: 8px;
  color: var(--line);
}
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* ---------- 9. 分段切换 ---------- */
.tabs { border-radius: 0; }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.tabs__tab {
  appearance: none;
  border: 0;
  border-radius: 0;
  background: var(--ink-2);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  padding: 11px 18px;
  min-height: 44px;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.tabs__tab:hover { color: var(--paper); }
.tabs__tab[aria-selected="true"] {
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}
.tabs__panel { padding-top: clamp(14px, 2vw, 26px); }
.tabs__panel[hidden] { display: none; }

/* ---------- 10. 入场显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 300;
  padding: 12px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  border-radius: 0;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 12. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
  min-height: var(--header-h);
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
  padding-block: 10px;
}
.brand__mark {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  background: linear-gradient(135deg, var(--cyan) 0 50%, var(--orange) 50% 100%);
}
.brand__text { display: block; }
.brand__name {
  display: block;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.1;
  font-stretch: condensed;
}
.brand__line {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
  line-height: 1.2;
}
.brand:hover .brand__name { color: var(--cyan); }

.header-rule {
  flex: 1 1 auto;
  min-width: 20px;
  height: 1px;
  background: var(--line);
  position: relative;
}
.header-rule__dot {
  position: absolute;
  right: 0;
  top: -2px;
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--paper);
  font-size: 12px;
  letter-spacing: .12em;
  cursor: pointer;
  position: relative;
  z-index: 100;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__label { line-height: 1; }
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 1px;
  width: 100%;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-2.5px) rotate(-45deg); }

.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 32px);
  flex: 0 0 auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 24px);
  counter-reset: navi;
}
.nav-list li {
  counter-increment: navi;
  display: flex;
  align-items: baseline;
  gap: 5px;
}
.nav-list li::before {
  content: counter(navi, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .06em;
  color: var(--line);
  transform: translateY(-3px);
  transition: color var(--dur) var(--ease);
}
.nav-list a {
  position: relative;
  display: inline-block;
  padding-block: 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transition: right var(--dur) var(--ease);
}
.nav-list a:hover { color: var(--paper); }
.nav-list a:hover::after { right: 0; }
.nav-list a[aria-current="page"] { color: var(--cyan); }
.nav-list a[aria-current="page"]::after { right: 0; }
.nav-list li:hover::before { color: var(--cyan); }
.nav-list li:has(a[aria-current="page"])::before { color: var(--cyan); }

.nav-aside {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 20px);
  padding-left: clamp(12px, 2vw, 26px);
  border-left: 1px solid var(--line);
}
.nav-guide {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  padding-block: 4px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-guide:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  pointer-events: none;
}
.scroll-progress i {
  display: block;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .12s linear;
}

.mobile-dock { display: none; }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(32px, 5vw, 80px);
  border-top: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
  padding-top: clamp(32px, 4.5vw, 64px);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 700px);
  height: 100%;
  pointer-events: none;
  background:
    linear-gradient(225deg, rgba(53, 230, 210, .1), transparent 62%),
    repeating-linear-gradient(135deg, rgba(42, 63, 85, .5) 0 1px, transparent 1px 14px);
  opacity: .7;
}
.site-footer .shell { position: relative; z-index: 1; }

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.6fr;
  gap: 0;
}
.footer-top > * {
  padding: clamp(18px, 2.2vw, 30px) clamp(14px, 2vw, 28px);
  border-left: 1px solid var(--line);
  min-width: 0;
}
.footer-brand {
  padding-left: 0 !important;
  border-left: 0 !important;
}
.footer-brand__mark {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.05;
  font-stretch: condensed;
  color: var(--paper);
}
.footer-brand__line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}
.footer-brand__note {
  margin-top: 18px;
  max-width: 32ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 14px;
  line-height: 1.4;
}
.footer-col ul li + li { margin-top: 9px; }
.footer-col a {
  font-size: 13px;
  color: var(--paper);
  opacity: .82;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-col a:hover {
  color: var(--cyan);
  opacity: 1;
  border-bottom-color: var(--cyan);
}

.footer-contact__list li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.6;
}
.footer-contact__list li + li { margin-top: 8px; }
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--line);
}
.footer-contact__value {
  color: var(--paper);
  word-break: break-word;
  overflow-wrap: anywhere;
}
.footer-contact__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 36ch;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: clamp(24px, 3.5vw, 48px);
  padding-block: 20px 26px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
}
.footer-legal, .footer-copy { max-width: none; }

/* ---------- 14. 平板 ---------- */
@media (max-width: 1080px) {
  :root { --header-h: 66px; }

  .header-rule { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(430px, 100%);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: calc(var(--header-h) + 16px) var(--gutter) 110px;
    background: var(--ink-2);
    border-left: 1px solid var(--line);
    overflow-y: auto;
    overscroll-behavior: contain;
    visibility: hidden;
    transform: translateX(101%);
    transition: transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
    z-index: 90;
  }
  .primary-nav[data-open] {
    visibility: visible;
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line);
  }
  .nav-list li {
    border-bottom: 1px solid var(--line);
    padding-block: 2px;
    align-items: baseline;
  }
  .nav-list a {
    display: block;
    padding-block: 14px;
    font-size: 20px;
    color: var(--paper);
    letter-spacing: .04em;
  }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] { color: var(--cyan); }

  .nav-aside {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    margin-top: 26px;
    padding-left: 0;
    border-left: 0;
  }
  .nav-guide {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 1px solid var(--line);
    font-size: 13px;
    letter-spacing: .12em;
  }
  .nav-guide:hover { border-color: var(--cyan); }
  .nav-aside .btn { width: 100%; }

  .mobile-dock {
    display: grid;
    grid-template-columns: 1fr 1fr;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    background: var(--ink);
    border-top: 1px solid var(--line);
  }
  .mobile-dock a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 12px 8px;
    font-size: 13px;
    letter-spacing: .1em;
    color: var(--paper);
  }
  .mobile-dock a + a {
    border-left: 1px solid var(--line);
    color: var(--cyan);
  }

  body { padding-bottom: 52px; }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-top > * {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-inline: 0;
  }
  .footer-top > *:nth-child(even) { padding-left: clamp(14px, 3vw, 28px); border-left: 1px solid var(--line); }
  .footer-brand, .footer-contact { grid-column: span 2; }
  .footer-contact { border-left: 0 !important; }
  .footer-brand__note, .footer-contact__note { max-width: 52ch; }
}

/* ---------- 15. 手机 ---------- */
@media (max-width: 600px) {
  :root { --gutter: 18px; }
  h1 { font-size: clamp(38px, 12vw, 60px); }
  .brand__line { font-size: 10px; letter-spacing: .1em; }
  .brand__name { font-size: 18px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-top > *,
  .footer-top > *:nth-child(even) {
    grid-column: span 1;
    padding-left: 0;
    border-left: 0;
  }
  .footer-brand, .footer-contact { grid-column: span 1; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-brand__note, .footer-contact__note { max-width: none; }
  .tabs__tab { flex: 1 1 auto; justify-content: center; }
}

/* ---------- 16. 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress i { transition: none; }
  .primary-nav { transition: none; }
}