/* ============================================================
   k1体育 · 北境数据台 — 共享样式表 /assets/site.css
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink-900:#0A1A2F;
  --ink-800:#12293F;
  --paper:#F2EBDD;
  --paper-ink:#1B1F24;
  --cyan:#35E0D6;
  --cyan-deep:#0E6E76;
  --orange:#FF7A2F;
  --orange-deep:#A8440E;
  --violet:#8C7BFF;
  --up:#35C46A;
  --down:#E2493F;
  --grey:#6B7C8C;
  --hair:#C9D6E2;

  --hair-08:rgba(201,214,226,.08);
  --hair-12:rgba(201,214,226,.12);
  --hair-24:rgba(201,214,226,.24);
  --hair-40:rgba(201,214,226,.40);
  --cyan-a16:rgba(53,224,214,.16);
  --cyan-a42:rgba(53,224,214,.42);
  --orange-a18:rgba(255,122,47,.18);
  --orange-a42:rgba(255,122,47,.42);
  --violet-a18:rgba(140,123,255,.18);
  --violet-a42:rgba(140,123,255,.42);
  --up-a42:rgba(53,196,106,.42);
  --down-a42:rgba(226,73,63,.42);
  --paper-line:rgba(27,31,36,.14);
  --paper-line-strong:rgba(27,31,36,.30);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-data:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell-w:min(1280px, calc(100% - 2 * clamp(18px,4vw,56px)));
  --header-h:72px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--hair);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-wrap:break-word;
}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
ul,ol{margin:0;padding:0}
p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:0}
.zone-paper :focus-visible{outline-color:var(--orange-deep)}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0 0 .5em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.02em;
  color:var(--paper);
}
h1{font-size:clamp(40px,6vw,88px);line-height:.98;letter-spacing:-.03em}
h2{font-size:clamp(28px,3.4vw,44px)}
h3{font-size:clamp(20px,2vw,24px);line-height:1.2;letter-spacing:-.01em}
h4{font-size:18px;line-height:1.32}
h2 em,h3 em{font-style:normal;color:var(--cyan)}
.eyebrow{
  display:block;
  margin:0 0 10px;
  font-family:var(--font-data);
  font-size:13px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.lede{font-size:clamp(17px,1.4vw,19px);line-height:1.72;color:var(--hair)}
.note{font-size:14px;line-height:1.7;color:var(--grey)}
.note-strong{color:var(--hair-40)}

/* ---------- 4. 布局工具 ---------- */
.shell{width:var(--shell-w);margin-inline:auto}
.zone{padding-block:clamp(56px,7vw,104px)}
.zone-dark{background:var(--ink-900);color:var(--hair)}
.zone-ice{background:var(--ink-800);color:var(--hair)}
.zone-paper{background:var(--paper);color:var(--paper-ink)}
.zone-paper h1,.zone-paper h2,.zone-paper h3,.zone-paper h4,.zone-paper h5,.zone-paper h6{color:var(--paper-ink)}
.zone-paper em{color:var(--orange-deep)}
.zone-paper a{color:var(--cyan-deep)}
.zone-paper .note{color:#54606B}
.zone-paper .eyebrow{color:var(--orange-deep)}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
.stack{display:flex;flex-direction:column;gap:clamp(14px,1.6vw,22px)}
.stack-tight{display:flex;flex-direction:column;gap:8px}
.prose{max-width:72ch;font-size:17px;line-height:1.78}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em;list-style:disc}
.prose li{margin-bottom:.4em}

.rule-slash{
  height:1px;
  margin:clamp(28px,4vw,56px) 0;
  border:0;
  background:linear-gradient(90deg,transparent,var(--hair-24) 10%,var(--hair-24) 90%,transparent);
  transform:rotate(-.6deg);
}
.zone-paper .rule-slash{background:linear-gradient(90deg,transparent,var(--paper-line-strong) 10%,var(--paper-line-strong) 90%,transparent)}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:fixed;
  top:0;
  right:0;
  left:0;
  z-index:90;
  background:rgba(10,26,47,.58);
  border-bottom:1px solid var(--hair-08);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.site-header.is-solid{
  background:var(--ink-900);
  border-bottom-color:var(--hair-24);
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
  box-shadow:inset 0 -1px 0 rgba(0,0,0,.35);
}
.skip-link{
  position:absolute;
  top:6px;
  left:clamp(18px,4vw,56px);
  z-index:200;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink-900);
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);text-decoration:none}
.header-shell{
  position:relative;
  width:var(--shell-w);
  margin-inline:auto;
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(14px,2.2vw,36px);
  padding-block:10px;
}

/* 品牌 */
.brand-lockup{min-width:0}
.brand-mark{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:inherit;
}
.brand-mark:hover{text-decoration:none}
.brand-glyph{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:44px;
  height:40px;
  background:linear-gradient(155deg,var(--cyan),#1B9EAF);
  color:var(--ink-900);
  font-family:var(--font-data);
  font-size:15px;
  font-weight:700;
  letter-spacing:-.04em;
  transform:skewX(-6deg);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.2;
  color:var(--paper);
}
.brand-tag{
  font-size:12px;
  line-height:1.4;
  letter-spacing:.02em;
  color:var(--grey);
  white-space:nowrap;
}

/* 导航 */
.site-nav{min-width:0}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.nav-list::-webkit-scrollbar{height:2px}
.nav-list::-webkit-scrollbar-thumb{background:var(--hair-24)}
.nav-link{
  position:relative;
  display:block;
  padding:10px 14px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--grey);
  white-space:nowrap;
  text-decoration:none;
  transition:color .16s var(--ease);
}
.nav-link:hover{color:var(--paper);text-decoration:none}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:3px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s var(--ease);
}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:transparent;
  border:1px solid var(--hair-24);
  color:var(--hair);
  font-family:var(--font-body);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--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:1.5px;
  background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(38deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-38deg)}

/* 快捷入口 */
.quick-rail{
  display:flex;
  align-items:center;
  gap:8px;
  min-width:0;
  overflow-x:auto;
  padding-block:2px;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.quick-rail::-webkit-scrollbar{height:0}
.quick-link{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:8px 12px;
  border:1px solid var(--hair-24);
  background:var(--cyan-a16);
  color:var(--hair);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.02em;
  white-space:nowrap;
  text-decoration:none;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.quick-link::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,0 100%);
}
.quick-link:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  text-decoration:none;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-900);
  color:var(--hair);
  border-top:1px solid var(--hair-24);
  padding-block:clamp(44px,5.4vw,80px) 22px;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:min(240px,32%);
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
}
.footer-shell{width:var(--shell-w);margin-inline:auto}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px 32px;
  padding-bottom:clamp(20px,2.4vw,30px);
  border-bottom:1px solid var(--hair-12);
}
.footer-lockup{
  display:block;
  font-family:var(--font-display);
  font-size:clamp(21px,2.6vw,30px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.15;
  color:var(--paper);
}
.footer-note{
  margin:10px 0 0;
  max-width:58ch;
  font-size:14px;
  line-height:1.7;
  color:var(--grey);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.25fr 1fr 1.1fr .85fr;
  gap:clamp(24px,3vw,44px);
  padding-block:clamp(28px,3.4vw,48px);
}
.footer-col{min-width:0}
.footer-title{
  margin:0 0 14px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  line-height:1.4;
  color:var(--cyan);
}
.footer-list{
  list-style:none;
  display:grid;
  gap:2px;
}
.footer-list li{
  font-size:14px;
  line-height:1.62;
  color:var(--grey);
  padding:4px 0;
}
.footer-list a{
  color:var(--hair);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan);text-decoration:none}
.footer-list-sub{margin-top:10px;padding-top:10px;border-top:1px solid var(--hair-12)}
.footer-terms li::before{content:"—";margin-right:8px;color:var(--hair-40)}
.footer-contact{align-items:flex-start}
.footer-strong{
  font-family:var(--font-data);
  font-size:14px;
  letter-spacing:.01em;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}
.footer-meta{
  margin:12px 0 0;
  font-size:12.5px;
  line-height:1.7;
  color:var(--grey);
  border-left:2px solid var(--hair-24);
  padding-left:10px;
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-top:18px;
  border-top:1px solid var(--hair-12);
  font-size:13px;
  color:var(--grey);
}
.footer-base p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{color:var(--grey);text-decoration:none;transition:color .16s var(--ease)}
.footer-legal a:hover{color:var(--cyan)}

/* ---------- 7. 按钮 / 标签 / 面包屑 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#180A02}
.btn-primary:hover{background:#FF9057;border-color:#FF9057;color:#180A02}
.btn-ghost{background:transparent;border-color:var(--hair-24);color:var(--cyan)}
.btn-ghost:hover{border-color:var(--cyan);background:var(--cyan-a16);color:var(--cyan)}
.btn-quiet{background:transparent;border-color:var(--hair-24);color:var(--hair)}
.btn-quiet:hover{border-color:var(--cyan);color:var(--cyan)}
.zone-paper .btn-ghost{border-color:var(--paper-line-strong);color:var(--orange-deep)}
.zone-paper .btn-ghost:hover{border-color:var(--orange-deep);background:var(--orange-a18);color:var(--orange-deep)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--hair-24);
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.5;
  color:var(--hair);
  white-space:nowrap;
}
.tag-cyan{color:var(--cyan);border-color:var(--cyan-a42);background:var(--cyan-a16)}
.tag-orange{color:var(--orange);border-color:var(--orange-a42);background:var(--orange-a18)}
.tag-violet{color:var(--violet);border-color:var(--violet-a42);background:var(--violet-a18)}
.tag-up{color:var(--up);border-color:var(--up-a42)}
.tag-down{color:var(--down);border-color:var(--down-a42)}
.tag-up::before{content:"▲";font-size:9px}
.tag-down::before{content:"▼";font-size:9px}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  list-style:none;
  margin:0 0 18px;
  font-size:13px;
  letter-spacing:.02em;
  color:var(--grey);
}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:"／";margin:0 8px;color:var(--hair-40)}
.breadcrumb a{color:var(--grey);text-decoration:none;transition:color .16s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--hair)}
.zone-paper .breadcrumb{color:#5A6672}
.zone-paper .breadcrumb a{color:#5A6672}
.zone-paper .breadcrumb a:hover{color:var(--orange-deep)}
.zone-paper .breadcrumb [aria-current="page"]{color:var(--paper-ink)}

/* ---------- 8. 数字卡 ---------- */
.data-figure{
  display:flex;
  flex-direction:column;
  gap:5px;
  min-width:0;
  padding:16px 18px 18px;
  background:rgba(18,41,63,.62);
  border-left:2px solid var(--cyan);
}
.data-figure-value{
  font-family:var(--font-data);
  font-size:clamp(32px,4.2vw,56px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}
.data-figure-unit{
  margin-left:.35em;
  font-size:.4em;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--cyan);
  vertical-align:.45em;
}
.data-figure-label{
  font-size:13px;
  letter-spacing:.08em;
  line-height:1.5;
  color:var(--grey);
}
.data-figure[data-tone="violet"]{border-left-color:var(--violet)}
.data-figure[data-tone="violet"] .data-figure-unit{color:var(--violet)}
.data-figure[data-tone="orange"]{border-left-color:var(--orange)}
.data-figure[data-tone="orange"] .data-figure-unit{color:var(--orange)}
.zone-paper .data-figure{background:rgba(27,31,36,.045);border-left-color:var(--cyan-deep)}
.zone-paper .data-figure-value{color:var(--paper-ink)}
.zone-paper .data-figure-unit{color:var(--cyan-deep)}
.zone-paper .data-figure-label{color:#5A6672}

/* ---------- 9. 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  margin:0;
  overflow:hidden;
  border:1px solid var(--hair-24);
  background:
    linear-gradient(150deg,rgba(53,224,214,.10),rgba(140,123,255,.10)),
    var(--ink-800);
}
.media img{width:100%;height:100%;object-fit:cover;display:block}
.media::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(201,214,226,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,214,226,.14) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.5;
  pointer-events:none;
}
.media-21x9{aspect-ratio:21/9}
.media-16x9{aspect-ratio:16/9}
.media-4x3{aspect-ratio:4/3}
.media-3x4{aspect-ratio:3/4}
.media-1x1{aspect-ratio:1/1}
.media-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:clamp(10px,1.3vw,18px);
  margin:0;
}
.media-caption{
  margin:10px 0 0;
  font-size:13px;
  line-height:1.65;
  color:var(--grey);
  border-left:2px solid var(--hair-24);
  padding-left:10px;
}
.zone-paper .media{border-color:var(--paper-line-strong);background:linear-gradient(150deg,rgba(14,110,118,.10),rgba(140,123,255,.10)),#DCD4C4}
.zone-paper .media::before{background-image:linear-gradient(rgba(27,31,36,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(27,31,36,.10) 1px,transparent 1px)}
.zone-paper .media-caption{color:#5A6672;border-left-color:var(--paper-line-strong)}

/* ---------- 10. 滚动进度与返回顶部 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:120;
  width:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  pointer-events:none;
  transition:width .08s linear;
}
.to-top{
  position:fixed;
  right:clamp(14px,2.4vw,32px);
  bottom:clamp(14px,2.4vw,32px);
  z-index:100;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  background:rgba(18,41,63,.94);
  border:1px solid var(--hair-24);
  color:var(--hair);
  font-family:var(--font-data);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.1em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear,border-color .16s var(--ease),color .16s var(--ease);
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1079px){
  .header-shell{
    grid-template-columns:auto minmax(0,1fr);
    gap:10px 18px;
    padding-block:10px 8px;
  }
  .brand-lockup{grid-column:1;grid-row:1}
  .site-nav{grid-column:2;grid-row:1}
  .quick-rail{
    grid-column:1 / -1;
    grid-row:2;
    padding-top:6px;
    border-top:1px solid var(--hair-12);
  }
  .brand-tag{display:none}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12}
}

@media (max-width:819px){
  .header-shell{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    gap:8px 12px;
    padding-block:8px 10px;
  }
  .brand-lockup{grid-column:1;grid-row:1;min-width:0}
  .brand-name{font-size:15.5px}
  .nav-toggle{grid-column:2;grid-row:1;display:inline-flex}
  .site-nav{
    grid-column:1 / -1;
    grid-row:2;
    max-height:0;
    overflow:hidden;
    transition:max-height .24s var(--ease);
  }
  .site-header[data-open] .site-nav{max-height:440px}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    overflow:visible;
  }
  .nav-link{
    padding:14px 4px 14px 2px;
    font-size:16px;
    border-bottom:1px solid var(--hair-12);
  }
  .nav-link::after{left:2px;right:auto;width:26px;bottom:9px}
  .quick-rail{
    grid-column:1 / -1;
    grid-row:3;
    padding-top:6px;
    border-top:1px solid var(--hair-12);
  }
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-top{align-items:flex-start}
  .footer-base{flex-direction:column;align-items:flex-start}
}

@media (max-width:520px){
  body{font-size:16px}
  .brand-glyph{width:36px;height:34px;font-size:13px}
  .quick-link{font-size:13px;padding:7px 10px}
  .btn{width:100%;justify-content:center}
  .footer-top .btn{width:auto}
}

@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-progress{transition:none}
}