/* =========================================================
   k1体育3915 — /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 命令栏头部 / 索引式页脚
   ========================================================= */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- tokens ---------- */
:root {
  --ink-navy: #060D1A;
  --charcoal: #12181F;
  --hairline: #26313D;
  --cool-white: #E9F0F6;
  --mist: #94A5B4;
  --signal-cyan: #2FE0D2;
  --signal-orange: #FF6A2A;
  --deep-teal: #0A3235;
  --wine: #3A1024;
  --indigo: #191645;
  --amber-note: #FFC46B;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-head: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 1320px;
  --shell-pad: clamp(16px, 4vw, 40px);
  --radius: 3px;
  --ease: cubic-bezier(.2, .6, .25, 1);
  --dur: .16s;
  --header-h: 64px;
}

/* ---------- base ---------- */
html { scroll-behavior: smooth; }
body {
  background: var(--ink-navy);
  color: var(--cool-white);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--signal-cyan); color: #04121A; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 88%;
  letter-spacing: .04em;
  line-height: 1.2;
  color: var(--cool-white);
}
h1 { font-size: clamp(28px, 3.6vw, 44px); }
h2 { font-size: clamp(22px, 2.4vw, 28px); }
h3 { font-size: 20px; }
h4 { font-size: 17px; }
strong, b { font-weight: 700; color: var(--cool-white); }

p { color: var(--cool-white); }
.prose { max-width: 40em; }
.prose p + p { margin-top: 1.2em; }
.prose h2 { margin-top: 2em; margin-bottom: .6em; }
.prose h3 { margin-top: 1.6em; margin-bottom: .5em; }
.prose ul, .prose ol { margin-top: 1em; padding-left: 1.1em; }
.prose ul li { list-style: none; position: relative; padding-left: 1em; margin-bottom: .5em; }
.prose ul li::before {
  content: ""; position: absolute; left: 0; top: .78em;
  width: 5px; height: 5px; background: var(--signal-cyan); border-radius: 1px;
}
.prose ol { list-style: decimal; }
.prose ol li { margin-bottom: .5em; }

a { transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease); }

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

/* ---------- 文本工具 ---------- */
.t-display { font-family: var(--font-head); font-weight: 700; font-stretch: 84%; letter-spacing: .02em; line-height: 1.04; font-size: clamp(32px, 4.8vw, 64px); text-transform: uppercase; }
.t-h1 { font-family: var(--font-head); font-size: clamp(26px, 3vw, 40px); letter-spacing: .04em; line-height: 1.16; }
.t-h2 { font-family: var(--font-head); font-size: clamp(21px, 2.2vw, 28px); letter-spacing: .04em; }
.t-h3 { font-family: var(--font-head); font-size: 19px; letter-spacing: .04em; }
.t-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--mist); }
.t-meta { font-size: 13px; color: var(--mist); line-height: 1.6; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--signal-cyan);
}
.eyebrow::before { content: ""; width: 14px; height: 1px; background: var(--signal-cyan); }
.num { font-family: var(--font-mono); font-size: 1.15em; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--mist); }
.cyan { color: var(--signal-cyan); }
.orange { color: var(--signal-orange); }

/* ---------- 布局 ---------- */
.shell { width: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--shell-pad); }
.shell--narrow { max-width: 820px; }
.shell--wide { max-width: 1520px; }
.section { padding-block: clamp(40px, 6vw, 88px); }
.section--tight { padding-block: clamp(22px, 3vw, 40px); }
.rule { height: 1px; border: 0; background: var(--hairline); }

.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--index {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
  align-items: start;
}

.index-rail {
  position: sticky;
  top: calc(var(--header-h) + 20px);
  border-left: 1px solid var(--hairline);
  padding-left: 16px;
}
.index-rail__title {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--signal-cyan); margin-bottom: 14px;
}
.index-rail__list { display: flex; flex-direction: column; gap: 2px; }
.index-rail__item {
  display: flex; align-items: baseline; gap: 10px;
  padding: 8px 10px; border-radius: 2px;
  font-size: 14px; color: var(--mist);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.index-rail__item:hover { background: rgba(47, 224, 210, .07); color: var(--cool-white); }
.index-rail__item[aria-current="page"] { background: rgba(47, 224, 210, .1); color: var(--signal-cyan); }
.index-rail__idx { font-family: var(--font-mono); font-size: 11px; opacity: .7; }

/* ---------- 分区色带 ---------- */
.band {
  position: relative;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding-block: clamp(36px, 5vw, 80px);
}
.band--teal { background: var(--deep-teal); }
.band--wine { background: var(--wine); }
.band--indigo { background: var(--indigo); }
.band--grid-veil::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(148, 165, 180, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 165, 180, .09) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 92%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 92%);
}
.band > * { position: relative; z-index: 1; }

/* ---------- 面板 / 数据组件 ---------- */
.panel {
  background: var(--charcoal);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: clamp(18px, 2vw, 28px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.panel:hover { transform: translateY(-1px); border-color: rgba(47, 224, 210, .35); }
.panel--teal { background: var(--deep-teal); border-color: rgba(47, 224, 210, .22); }
.panel--wine { background: var(--wine); border-color: rgba(255, 106, 42, .2); }
.panel--indigo { background: var(--indigo); border-color: rgba(148, 165, 180, .22); }

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value {
  font-family: var(--font-mono); font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 44px); font-weight: 700;
  letter-spacing: -.02em; line-height: 1; color: var(--cool-white);
}
.stat__label { font-size: 13px; color: var(--mist); }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border: 1px solid var(--hairline); border-radius: 999px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em;
  color: var(--mist); white-space: nowrap;
}
.tag--cyan { border-color: rgba(47, 224, 210, .42); color: var(--signal-cyan); }
.tag--orange { border-color: rgba(255, 106, 42, .44); color: var(--signal-orange); }
.tag--amber { border-color: rgba(255, 196, 107, .42); color: var(--amber-note); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px;
  font-size: 14px; font-weight: 700; letter-spacing: .04em;
  border: 1px solid transparent; border-radius: 2px; white-space: nowrap;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--signal-cyan); border-color: var(--signal-cyan); color: #04121A; }
.btn--primary:hover { background: #5CF0E5; border-color: #5CF0E5; color: #04121A; }
.btn--ghost { background: transparent; border-color: var(--hairline); color: var(--cool-white); }
.btn--ghost:hover { border-color: var(--signal-cyan); color: var(--signal-cyan); }
.btn--orange { background: transparent; border-color: rgba(255, 106, 42, .5); color: var(--signal-orange); }
.btn--orange:hover { background: rgba(255, 106, 42, .12); border-color: var(--signal-orange); }

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: absolute; left: 12px; top: -80px; z-index: 120;
  padding: 12px 18px; border-radius: 2px;
  background: var(--signal-cyan); color: #04121A;
  font-size: 14px; font-weight: 700; letter-spacing: .04em;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 命令栏头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background: rgba(6, 13, 26, .94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.command-bar {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(16px, 2.4vw, 40px);
}

/* 品牌 */
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand__mark {
  width: 34px; height: 34px; flex: 0 0 34px;
  display: grid; place-items: center;
  border: 1px solid var(--signal-cyan); border-radius: 2px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 700; letter-spacing: .06em;
  color: var(--signal-cyan);
  background: linear-gradient(155deg, rgba(47, 224, 210, .18), rgba(47, 224, 210, 0) 72%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.18; }
.brand__name { font-size: 15px; font-weight: 700; letter-spacing: .03em; color: var(--cool-white); }
.brand__sub { font-size: 11px; letter-spacing: .02em; color: var(--mist); white-space: nowrap; }

/* 主导航 */
.primary-nav { min-width: 0; }
.primary-nav__list { display: flex; align-items: center; gap: 2px; }
.primary-nav__link {
  position: relative;
  display: inline-flex; align-items: baseline; gap: 6px;
  padding: 11px 12px; border-radius: 2px;
  font-size: 14px; color: var(--mist); white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.primary-nav__idx { font-family: var(--font-mono); font-size: 10px; opacity: .6; }
.primary-nav__link::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 2px;
  background: var(--signal-cyan);
  transform: scaleX(0); transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.primary-nav__link:hover { color: var(--cool-white); background: rgba(47, 224, 210, .06); }
.primary-nav__link:hover::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] { color: var(--cool-white); }
.primary-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] .primary-nav__idx { color: var(--signal-cyan); opacity: 1; }

/* 右侧工具 */
.bar-tools { display: flex; align-items: center; gap: 12px; }
.bar-tools__chip {
  padding: 5px 9px;
  border: 1px solid var(--hairline); border-radius: 2px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em;
  color: var(--mist); white-space: nowrap;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none; align-items: center; gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--hairline); border-radius: 2px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--cool-white);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--signal-cyan); color: var(--signal-cyan); }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; right: 0; height: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease), bottom var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 5px; transform: rotate(-45deg); }

/* 滚动进度 */
.scroll-progress { height: 2px; background: rgba(38, 49, 61, .5); overflow: hidden; }
.scroll-progress > span {
  display: block; width: 0; height: 100%;
  background: linear-gradient(90deg, var(--signal-cyan), var(--signal-orange));
  transition: width .1s linear;
}

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-top: 20px; }
.breadcrumb__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--mist);
}
.breadcrumb__link:hover { color: var(--signal-cyan); }
.breadcrumb__sep { color: var(--mist); opacity: .55; }
.breadcrumb__current { color: var(--cool-white); }

/* ---------- 图片容器 ---------- */
.media {
  position: relative; overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(47, 224, 210, .08), rgba(6, 13, 26, 0) 60%),
    var(--charcoal);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media img,
.media video { width: 100%; height: 100%; object-fit: cover; }
.media__caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 14px 16px;
  font-size: 12px; line-height: 1.6; color: var(--cool-white);
  background: linear-gradient(180deg, rgba(6, 13, 26, 0), rgba(6, 13, 26, .92));
}

/* ---------- 分段控件（标签页） ---------- */
.tabs {
  display: flex; flex-wrap: wrap; gap: 2px;
  border-bottom: 1px solid var(--hairline);
}
.tab {
  position: relative;
  padding: 12px 16px;
  font-size: 14px; font-weight: 700; letter-spacing: .04em;
  color: var(--mist);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.tab::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 2px;
  background: var(--signal-cyan);
  transform: scaleX(0); transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.tab:hover { color: var(--cool-white); background: rgba(47, 224, 210, .05); }
.tab[aria-selected="true"] { color: var(--cool-white); }
.tab[aria-selected="true"]::after { transform: scaleX(1); }
.tab-panel { display: block; padding-top: clamp(18px, 2.4vw, 32px); }

/* ---------- 滚动显现 ---------- */
[data-reveal] { opacity: 1; transition: opacity .5s var(--ease), transform .5s var(--ease); }
.js [data-reveal] { opacity: 0; transform: translateY(14px); }
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 120px);
  background: var(--ink-navy);
  border-top: 1px solid var(--hairline);
}
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0;
  width: clamp(80px, 16vw, 220px); height: 2px;
  background: linear-gradient(90deg, var(--signal-cyan), var(--signal-orange));
}
.site-footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 72px) var(--shell-pad) clamp(22px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(28px, 4vw, 72px);
}

.footer-brand__head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand__mark {
  width: 30px; height: 30px; flex: 0 0 30px;
  display: grid; place-items: center;
  border: 1px solid rgba(47, 224, 210, .5); border-radius: 2px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700; letter-spacing: .06em;
  color: var(--signal-cyan);
}
.footer-brand__name { font-family: var(--font-head); font-size: 17px; font-weight: 700; letter-spacing: .04em; color: var(--cool-white); }
.footer-brand__note { max-width: 30em; font-size: 14px; line-height: 1.75; color: var(--mist); }
.footer-brand__contact { margin-top: 20px; display: flex; flex-direction: column; gap: 8px; }
.footer-brand__contact li { display: flex; flex-wrap: wrap; gap: 10px; align-items: baseline; font-size: 13.5px; }
.footer-brand__key {
  flex: 0 0 auto; min-width: 4.6em;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--signal-cyan); text-transform: uppercase;
}
.footer-brand__val { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--cool-white); word-break: break-all; }

.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(20px, 3vw, 44px); }
.footer-nav__title {
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--signal-cyan);
}
.footer-nav__list { display: flex; flex-direction: column; gap: 10px; }
.footer-nav__link { font-size: 14px; color: var(--mist); }
.footer-nav__link:hover { color: var(--cool-white); }
.footer-nav__link[aria-current="page"] { color: var(--signal-cyan); }

.footer-base {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 18px var(--shell-pad) clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--hairline);
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: 10px 28px;
  font-size: 12.5px; color: var(--mist);
}
.footer-base__addr { color: var(--mist); }
.footer-base__legal { font-family: var(--font-mono); letter-spacing: .04em; color: var(--mist); }

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .bar-tools__chip { display: none; }
}
@media (max-width: 1020px) {
  .grid--index { grid-template-columns: minmax(0, 1fr); }
  .index-rail { position: static; border-left: 0; border-top: 1px solid var(--hairline); padding: 18px 0 0; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 960px) {
  :root { --header-h: 56px; }
  .command-bar {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding-block: 8px;
  }
  .bar-tools { display: none; }
  .nav-toggle { display: inline-flex; justify-self: end; }
  .brand__sub { display: none; }

  .primary-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: none;
    grid-column: 1 / -1;
    background: var(--ink-navy);
    border-bottom: 1px solid var(--hairline);
    padding: 6px var(--shell-pad) 20px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .primary-nav[data-open] { display: block; }
  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav__link {
    width: 100%;
    padding: 15px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--hairline);
    border-radius: 0;
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link[aria-current="page"] { color: var(--signal-cyan); background: transparent; }
  .primary-nav__link[aria-current="page"] .primary-nav__idx { color: var(--signal-cyan); }
}
@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 20px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab { flex: 0 0 auto; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .panel:hover { transform: none; }
}