/* =========================================================
   YABO 体育主站 · 共享样式表  /assets/site.css
   高原夜空蓝 / 雪山白 / 品牌橙红 / 经幡五色
   ========================================================= */

/* ---------- 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,h5,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;}

/* ---------- 2. 变量 ---------- */
:root{
  --night:#0B1B3A;
  --night-deep:#060D1F;
  --night-2:#162A4D;
  --snow:#F7FAFF;
  --white:#FFFFFF;
  --orange:#FF5A36;
  --orange-dark:#E8451F;
  --ice:#4DA3FF;
  --flag-blue:#2E6BFF;
  --flag-red:#E63946;
  --flag-green:#2A9D8F;
  --flag-yellow:#F4C430;
  --mist:#C7D0DD;
  --ink:#0B1B3A;
  --ink-soft:#4C5A78;
  --line:rgba(11,27,58,.12);
  --line-dark:rgba(247,250,255,.16);
  --radius:16px;
  --radius-sm:10px;
  --gutter:clamp(16px,4vw,40px);
  --maxw:1260px;
  --header-h:72px;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.68,.16,1);
  --dur:.32s;
  --shadow-1:0 12px 32px rgba(6,13,31,.14);
  --shadow-2:0 24px 60px rgba(6,13,31,.28);
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--snow);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:900;line-height:1.12;letter-spacing:-.015em;}
h1{font-size:clamp(2.1rem,5.4vw,4.4rem);}
h2{font-size:clamp(1.6rem,3.2vw,2.6rem);}
h3{font-size:clamp(1.2rem,2vw,1.55rem);}
h4{font-size:1.05rem;letter-spacing:0;}
p{font-size:1rem;}
a{color:var(--flag-blue);text-decoration:none;transition:color var(--dur) var(--ease);}
a:hover{color:var(--ice);}
strong{font-weight:800;}
:focus-visible{outline:2px solid var(--ice);outline-offset:3px;}
::selection{background:var(--orange);color:var(--white);}
[hidden]{display:none !important;}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:0;left:var(--gutter);
  z-index:200;
  transform:translateY(-140%);
  background:var(--orange);
  color:var(--white);
  font-size:14px;
  font-weight:700;
  padding:10px 18px;
  border-radius:0 0 var(--radius-sm) var(--radius-sm);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--white);}

/* ---------- 5. 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,6.5vw,96px);}
.section-band{
  background:var(--night);
  color:var(--snow);
  padding-block:clamp(48px,7vw,104px);
}
.section-band--soft{background:var(--night-2);}
.section-band a{color:var(--ice);}
.section-band a:hover{color:var(--white);}
.section-head{display:grid;gap:12px;max-width:74ch;margin-bottom:clamp(20px,3vw,38px);}
.section-head p{color:var(--ink-soft);}
.section-band .section-head p{color:rgba(247,250,255,.72);}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;
  color:var(--flag-blue);
}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor;border-radius:2px;}
.section-band .eyebrow{color:var(--ice);}

/* ---------- 6. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--snow);
  background:linear-gradient(180deg,rgba(11,27,58,.94),rgba(11,27,58,.62));
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid transparent;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header.is-scrolled{
  background:var(--night);
  border-bottom-color:var(--line-dark);
  box-shadow:0 12px 32px rgba(6,13,31,.38);
}
.progress-rail{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(247,250,255,.12);
  pointer-events:none;
}
.progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--flag-blue),var(--ice),var(--orange));
  transition:transform .12s linear;
}
.header-inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  min-height:var(--header-h);
}

/* 品牌 */
.brand{
  display:inline-flex;align-items:center;gap:12px;
  color:var(--snow);text-decoration:none;flex:0 0 auto;
}
.brand:hover{color:var(--snow);}
.brand-mark{display:flex;align-items:flex-end;gap:3px;height:28px;}
.brand-mark i{display:block;width:6px;border-radius:2px 2px 0 0;background:var(--ice);}
.brand-mark i:nth-child(1){height:13px;background:var(--flag-blue);}
.brand-mark i:nth-child(2){height:21px;background:var(--orange);}
.brand-mark i:nth-child(3){height:28px;background:var(--flag-green);}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{font-size:19px;font-weight:900;letter-spacing:.02em;}
.brand-dot{color:var(--orange);}
.brand-sub{font-size:11px;letter-spacing:.16em;color:rgba(247,250,255,.62);}

/* 主导航 */
.site-nav{display:flex;align-items:center;gap:18px;margin-inline:auto;}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.5vw,24px);}
.nav-link{
  position:relative;
  display:inline-block;
  padding:8px 2px;
  font-size:15px;font-weight:600;
  color:rgba(247,250,255,.82);
  text-decoration:none;
}
.nav-link:hover{color:var(--white);}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--orange),var(--flag-yellow));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .24s var(--ease);
}
.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--white);}
.nav-foot{display:none;}

/* 头部操作区 */
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.icon-btn{
  position:relative;
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 15px;
  border-radius:999px;
  border:1px solid rgba(247,250,255,.24);
  background:rgba(247,250,255,.08);
  color:var(--snow);
  font-size:13px;letter-spacing:.08em;
  cursor:pointer;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.icon-btn:hover{background:rgba(77,163,255,.24);border-color:var(--ice);}
.icon-btn::before{
  content:"";width:9px;height:9px;border:2px solid currentColor;border-radius:50%;
}
.icon-btn::after{
  content:"";position:absolute;left:15px;top:calc(50% + 4px);
  width:7px;height:2px;border-radius:2px;background:currentColor;transform:rotate(45deg);
}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 15px;border-radius:999px;
  border:1px solid rgba(247,250,255,.24);
  background:rgba(247,250,255,.08);
  color:var(--snow);
  font-size:12px;letter-spacing:.12em;
  cursor:pointer;
}
.nav-toggle:hover{background:rgba(77,163,255,.24);border-color:var(--ice);}
.nav-toggle-bars{
  position:relative;display:block;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:background .2s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:transform .24s var(--ease);
}
.nav-toggle-bars::before{top:-5px;}
.nav-toggle-bars::after{top:5px;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}

/* 搜索抽屉 */
.search-drawer{
  background:var(--night-deep);
  border-top:1px solid var(--line-dark);
  padding-block:20px 24px;
}
.search-hint{
  font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(247,250,255,.56);margin-bottom:14px;
}
.search-links{display:flex;flex-wrap:wrap;gap:10px;}
.chip{
  display:inline-flex;align-items:center;
  padding:8px 15px;border-radius:999px;
  border:1px solid rgba(247,250,255,.25);
  background:rgba(77,163,255,.14);
  color:var(--snow);
  font-size:14px;text-decoration:none;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.chip:hover{background:var(--ice);border-color:var(--ice);color:var(--night);}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  overflow:hidden;
  margin-top:clamp(48px,8vw,110px);
  background:var(--night-deep);
  color:var(--snow);
  padding-bottom:28px;
}
.site-footer::before{
  content:"";
  position:absolute;left:0;right:0;top:0;
  height:clamp(90px,14vw,190px);
  background:linear-gradient(180deg,rgba(46,107,255,.30),rgba(6,13,31,0));
  clip-path:polygon(0% 100%,10% 54%,22% 78%,36% 26%,50% 72%,64% 34%,78% 74%,90% 46%,100% 100%);
  pointer-events:none;
}
.footer-band{
  position:relative;z-index:1;
  height:6px;
  background:linear-gradient(90deg,
    var(--flag-blue) 0 20%,
    var(--white) 20% 40%,
    var(--flag-red) 40% 60%,
    var(--flag-green) 60% 80%,
    var(--flag-yellow) 80% 100%);
  opacity:.88;
}
.footer-inner{position:relative;z-index:1;padding-top:clamp(40px,6vw,76px);}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.4fr;
  gap:clamp(24px,4vw,52px);
}
.brand--footer{margin-bottom:16px;}
.footer-slogan{
  font-size:15px;line-height:1.7;
  color:rgba(247,250,255,.74);
  max-width:34ch;
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.tag{
  display:inline-flex;align-items:center;
  padding:4px 10px;border-radius:6px;
  font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  background:rgba(247,250,255,.1);
  color:var(--snow);
  border:1px solid transparent;
}
.tag--blue{background:rgba(46,107,255,.22);color:#C3D6FF;border-color:rgba(46,107,255,.5);}
.tag--white{background:rgba(255,255,255,.14);color:var(--white);border-color:rgba(255,255,255,.36);}
.tag--red{background:rgba(230,57,70,.22);color:#FFC6CC;border-color:rgba(230,57,70,.5);}
.tag--green{background:rgba(42,157,143,.22);color:#B7EDE5;border-color:rgba(42,157,143,.5);}
.tag--yellow{background:rgba(244,196,48,.2);color:#FFE6A3;border-color:rgba(244,196,48,.5);}
.footer-title{
  font-size:12px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(247,250,255,.54);
  margin-bottom:16px;
}
.footer-links{display:grid;gap:11px;}
.footer-links a{
  font-size:15px;color:rgba(247,250,255,.86);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-links a:hover{color:var(--ice);border-bottom-color:var(--ice);}
.footer-contact{display:grid;gap:14px;font-size:15px;}
.footer-contact .label{
  display:block;
  font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(247,250,255,.5);
  margin-bottom:4px;
}
.footer-value{color:rgba(247,250,255,.9);word-break:break-word;}
.footer-note{
  margin-top:16px;font-size:13px;line-height:1.65;
  color:rgba(247,250,255,.56);max-width:34ch;
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 26px;
  margin-top:clamp(30px,5vw,58px);
  padding-top:22px;
  border-top:1px solid var(--line-dark);
  font-size:13px;
  color:rgba(247,250,255,.62);
}
.legal-links{display:flex;flex-wrap:wrap;gap:20px;}
.legal-links a{color:rgba(247,250,255,.82);text-decoration:none;}
.legal-links a:hover{color:var(--ice);}
.footer-copy{margin:0;}
.to-top{
  padding:9px 18px;border-radius:999px;
  border:1px solid rgba(247,250,255,.24);
  background:rgba(247,250,255,.08);
  color:var(--snow);
  font-size:12px;font-weight:700;letter-spacing:.1em;
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),visibility var(--dur);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;}
.to-top:hover{background:var(--orange);border-color:var(--orange);color:var(--white);}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:15px;font-weight:700;
  text-decoration:none;
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform .18s var(--ease),box-shadow var(--dur) var(--ease);
}
.btn--accent{
  background:var(--orange);
  color:var(--white);
  box-shadow:0 10px 24px rgba(255,90,54,.3);
}
.btn--accent:hover{background:var(--orange-dark);color:var(--white);transform:translateY(-1px);}
.btn--ghost{
  background:rgba(247,250,255,.08);
  border-color:rgba(247,250,255,.36);
  color:var(--snow);
}
.btn--ghost:hover{background:rgba(77,163,255,.24);border-color:var(--ice);color:var(--white);}
.btn--outline{
  background:transparent;
  border-color:var(--line);
  color:var(--ink);
}
.btn--outline:hover{border-color:var(--flag-blue);color:var(--flag-blue);}
.btn--sm{padding:9px 17px;font-size:13px;letter-spacing:.04em;}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;gap:8px;
  font-size:13px;letter-spacing:.04em;
  color:var(--ink-soft);
  margin-bottom:clamp(16px,2.6vw,28px);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li::after{content:"/";color:var(--mist);}
.breadcrumb li:last-child::after{content:"";}
.breadcrumb a{color:inherit;}
.breadcrumb a:hover{color:var(--flag-blue);}
.section-band .breadcrumb{color:rgba(247,250,255,.7);}

/* ---------- 10. 正文与面板 ---------- */
.prose{max-width:72ch;font-size:17px;line-height:1.78;}
.prose p{margin-bottom:1.2em;}
.prose h2{margin:1.6em 0 .6em;}
.prose h3{margin:1.4em 0 .5em;}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em;}
.prose ul{list-style:disc;}
.prose ol{list-style:decimal;}
.prose li{margin-bottom:.5em;}
.prose a{text-decoration:underline;text-underline-offset:3px;}
.prose blockquote{
  margin:0 0 1.2em;padding:14px 22px;
  border-left:3px solid var(--orange);
  background:rgba(77,163,255,.07);
  color:var(--ink-soft);
}
.solid-panel{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
  box-shadow:var(--shadow-1);
}
.solid-panel--accent{border-top:3px solid var(--orange);}
.glass-panel{
  background:rgba(247,250,255,.1);
  border:1px solid rgba(247,250,255,.2);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
  color:var(--snow);
}
.stat-mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
}

/* ---------- 11. 网格与节奏 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--quarters{grid-template-columns:repeat(4,minmax(0,1fr));}
.stack{display:grid;gap:clamp(14px,2vw,24px);}

/* ---------- 12. 图片容器基座 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(11,27,58,.94),rgba(46,107,255,.42) 55%,rgba(255,90,54,.4));
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;inset:0;
  background:
    repeating-linear-gradient(115deg,rgba(247,250,255,.1) 0 1px,transparent 1px 46px);
  pointer-events:none;
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:16 / 7;}
.media-frame--card{aspect-ratio:4 / 3;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--band{aspect-ratio:21 / 9;border-radius:0;}

/* ---------- 13. 显现动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.reveal.is-visible{opacity:1;transform:none;}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;}
  .footer-col--contact{grid-column:1 / -1;}
  .grid--quarters{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:980px){
  :root{--header-h:66px;}
  .site-nav{
    position:fixed;
    top:var(--header-h);
    right:0;
    left:auto;
    margin:0;
    width:min(88vw,340px);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:22px 22px 30px;
    background:var(--night-deep);
    border-left:1px solid var(--line-dark);
    box-shadow:var(--shadow-2);
    transform:translateX(103%);
    visibility:hidden;
    transition:transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .site-nav[data-open]{transform:none;visibility:visible;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-link{
    display:block;
    padding:13px 4px;
    font-size:17px;
    border-bottom:1px solid var(--line-dark);
  }
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{color:var(--orange);}
  .nav-foot{display:block;margin-top:22px;}
  .nav-toggle{display:inline-flex;}
  .grid--thirds{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--halves{grid-template-columns:1fr;}
}
@media (max-width:720px){
  body{font-size:16px;}
  .header-cta{display:none;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
  .footer-col--contact{grid-column:1 / -1;}
  .footer-legal{align-items:flex-start;}
  .grid--quarters,.grid--thirds{grid-template-columns:1fr;}
}
@media (max-width:480px){
  .icon-btn-text{display:none;}
  .brand-sub{display:none;}
  .footer-grid{grid-template-columns:1fr;}
  .media-frame--band{aspect-ratio:16 / 9;}
}

/* ---------- 15. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none;}
  .to-top{transform:none;}
}