/* =========================================================
   欧宝体育入口 · 共享样式表 /assets/site.css
   侧边导览 + 双层导航 + 赛季色带体系
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 令牌 ---------- */
:root{
  --navy-900:#071A2C;
  --navy-800:#0E2A47;
  --navy-700:#1B3E63;
  --orange-600:#E4572E;
  --orange-deep:#C4431E;
  --terracotta:#C1663F;
  --cyan-400:#35D0BA;
  --cyan-deep:#1B7A6C;
  --moss:#6B7F5B;
  --stone:#4A4F55;
  --carbon:#22262B;
  --cream:#F5F1E8;
  --white:#FFFFFF;

  --ink:var(--carbon);
  --ink-soft:var(--stone);
  --line:rgba(74,79,85,.16);
  --line-strong:rgba(74,79,85,.3);
  --line-light:rgba(245,241,232,.14);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-head);
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --rail:240px;
  --shell:1160px;
  --gutter:clamp(1rem,3vw,2rem);
  --radius:6px;
  --cut:14px;

  --dur:180ms;
  --ease:cubic-bezier(.4,.2,.2,1);
  --shadow-1:0 1px 0 rgba(7,26,44,.08);
  --shadow-2:0 16px 34px -20px rgba(7,26,44,.6);
}

/* ---------- 3. 中文排版基础 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  color:var(--ink);
  background:var(--cream);
  min-height:100vh;
  overflow-wrap:break-word;
  word-break:normal;
  text-align:start;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.3;
  letter-spacing:-.01em;
  color:inherit;
}
h1{font-size:clamp(2.4rem,4.4vw,3.6rem);line-height:1.16}
h2{font-size:clamp(1.4rem,2.4vw,1.6rem)}
h3{font-size:1.14rem}
h4{font-size:1rem}
p{max-width:76ch}
strong{font-weight:700}
.mono{
  font-family:var(--font-mono);
  font-size:.86em;
  letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
}
.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;
}

/* ---------- 4. 布局基础 ---------- */
.container{
  width:min(calc(100% - var(--gutter) * 2),var(--shell));
  margin-inline:auto;
}
.page-main{
  display:block;
  padding-block:clamp(1.5rem,4vw,2.8rem) clamp(2.4rem,6vw,4.5rem);
}
.section{padding-block:clamp(1.5rem,4vw,2.8rem)}
.section + .section{border-top:1px solid var(--line)}
.stack{display:grid;gap:1rem;align-content:start}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.6rem)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--font-mono);
  font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--terracotta);
}
.eyebrow::before{
  content:"";width:14px;height:3px;background:var(--orange-600);
  clip-path:polygon(0 0,100% 0,72% 100%,0 100%);
}
.section-title{
  display:flex;align-items:baseline;flex-wrap:wrap;gap:.5rem;
  font-size:clamp(1.35rem,2.4vw,1.6rem);font-weight:800;color:var(--navy-900);
}
.section-title__index{
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.12em;
  color:var(--orange-600);
}
.lede{font-size:1.05rem;line-height:1.85;color:var(--ink-soft);max-width:62ch}

/* ---------- 5. 焦点与可访问性 ---------- */
:focus-visible{outline:2px solid var(--cyan-400);outline-offset:2px;border-radius:2px}
.skip-link{
  position:fixed;top:.6rem;left:.6rem;z-index:200;
  transform:translateY(-180%);
  background:var(--cyan-400);color:var(--navy-900);
  padding:.55rem 1rem;border-radius:var(--radius);
  font-weight:700;font-size:.9rem;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.62rem 1.15rem;
  font-size:.94rem;font-weight:700;line-height:1.4;letter-spacing:.01em;
  border:1px solid transparent;border-radius:4px;
  cursor:pointer;text-align:center;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.btn--sm{padding:.42rem .8rem;font-size:.84rem}
.btn--primary{background:var(--orange-600);color:var(--white)}
.btn--primary:hover{background:var(--orange-deep);transform:translateY(-2px);box-shadow:0 12px 24px -14px rgba(228,87,46,.95)}
.btn--ghost{background:transparent;color:var(--cream);border-color:rgba(245,241,232,.32)}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.btn--cyan{background:var(--cyan-400);color:var(--navy-900)}
.btn--cyan:hover{background:#2bbca7;transform:translateY(-2px)}
.btn:active{transform:translateY(0)}

/* ---------- 7. 页头：侧边品牌轨道 ---------- */
.site-header{position:relative;z-index:60}
.brand-rail{display:none}
.brand-rail__brand{
  display:grid;gap:.3rem;
  padding-block-end:1.1rem;
  border-block-end:1px solid var(--line-light);
}
.brand-rail__mark{position:relative;width:42px;height:26px}
.brand-rail__mark::before{
  content:"";position:absolute;inset:0;background:var(--orange-600);
  clip-path:polygon(0 0,100% 0,72% 100%,0 100%);
}
.brand-rail__mark::after{
  content:"";position:absolute;right:0;bottom:0;width:17px;height:10px;
  background:var(--cyan-400);
  clip-path:polygon(28% 0,100% 0,72% 100%,0 100%);
}
.brand-rail__name{
  font-family:var(--font-head);font-size:1.26rem;font-weight:800;
  color:var(--white);letter-spacing:.01em;line-height:1.3;
}
.brand-rail__sub{color:var(--cyan-400);font-size:.72rem;letter-spacing:.24em}
.brand-rail__message{
  font-size:.96rem;line-height:1.75;color:rgba(245,241,232,.74);
  max-width:20ch;
  padding-inline-start:.75rem;
  border-inline-start:2px solid var(--terracotta);
}
.brand-rail__cta{margin-block-start:auto;width:100%}

/* 赛季切换器 */
.season-switcher{display:flex;flex-direction:column;gap:.3rem}
.season-switcher__label{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan-400);margin-block-end:.25rem;
}
.season-chip{
  text-align:start;
  padding:.42rem .7rem .42rem .85rem;
  font-size:.9rem;color:rgba(245,241,232,.68);
  border-inline-start:2px solid rgba(245,241,232,.18);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.season-chip:hover{background:var(--navy-700);color:var(--white)}
.season-chip[aria-pressed="true"]{
  background:var(--navy-700);color:var(--white);font-weight:700;
  border-inline-start-color:var(--orange-600);
}

/* ---------- 8. 页头：双层导航 ---------- */
.topline{
  display:flex;flex-wrap:wrap;gap:.35rem 1.4rem;
  align-items:center;justify-content:space-between;
  padding:.5rem var(--gutter);
  background:var(--navy-900);
  color:rgba(245,241,232,.76);
  font-size:.82rem;
  border-block-end:1px solid rgba(53,208,186,.16);
}
.topline__tag{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;max-width:none}
.topline__meta{font-size:.78rem;color:var(--cyan-400);max-width:none}

.navbar{
  position:relative;
  display:flex;align-items:center;gap:1.2rem;
  padding:.6rem var(--gutter);
  background:var(--navy-800);
  border-block-end:1px solid var(--line-light);
  box-shadow:var(--shadow-1);
}
.navbar::after{
  content:"";position:absolute;inset-inline:0;inset-block-end:-1px;height:1px;
  background:linear-gradient(90deg,var(--orange-600) 0 12%,var(--terracotta) 12% 22%,transparent 22% 100%);
  pointer-events:none;
}
.navbar__brand{
  font-family:var(--font-head);font-size:1.1rem;font-weight:800;
  color:var(--white);white-space:nowrap;
}
.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  margin-inline-start:auto;
  padding:.5rem .75rem;
  color:var(--white);font-size:.86rem;font-weight:700;
  border:1px solid rgba(245,241,232,.3);border-radius:4px;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-400);background:var(--navy-700)}
.nav-toggle__bars{position:relative;width:16px;height:2px;background:currentColor;transition:background var(--dur) var(--ease)}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform var(--dur) 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)}
.nav-toggle__text{white-space:nowrap}

.main-nav__list{display:flex;flex-wrap:wrap;align-items:center;gap:.1rem}
.main-nav__list a{
  position:relative;display:block;
  padding:.48rem .78rem;border-radius:4px;
  font-size:.94rem;font-weight:500;
  color:rgba(245,241,232,.78);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.main-nav__list a:hover{background:var(--navy-700);color:var(--white)}
.main-nav__list a[aria-current="page"]{background:var(--navy-700);color:var(--white);font-weight:700}
.main-nav__list a[aria-current="page"]::after{
  content:"";position:absolute;inset-inline:.78rem;inset-block-end:.2rem;
  height:2px;background:var(--orange-600);
  clip-path:polygon(0 0,100% 0,94% 100%,0 100%);
}
.main-nav__cta-item{display:none}

/* 滚动进度 */
.scroll-progress{
  position:fixed;inset-block-start:0;inset-inline-start:0;
  width:0;height:3px;z-index:150;pointer-events:none;
  background:linear-gradient(90deg,var(--orange-600),var(--terracotta) 45%,var(--cyan-400));
}

/* ---------- 9. 面包屑 / 正文组件 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:.82rem;letter-spacing:.04em;
  color:var(--ink-soft);
}
.breadcrumb a{padding-block:.15rem;transition:color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--navy-800);text-decoration:underline;text-underline-offset:3px}
.breadcrumb__sep{color:var(--terracotta)}

.panel{
  position:relative;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(1rem,2.2vw,1.4rem);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.panel:hover{transform:translateY(-3px);box-shadow:var(--shadow-2);border-color:rgba(53,208,186,.5)}
.panel--cut{
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel__title{font-size:1.08rem;font-weight:800;color:var(--navy-900);line-height:1.45}
.panel__meta{
  display:flex;flex-wrap:wrap;gap:.4rem .9rem;align-items:center;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.05em;
  color:var(--ink-soft);
}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.16rem .55rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  border-radius:3px;
  background:rgba(74,79,85,.1);color:var(--stone);
  border:1px solid rgba(74,79,85,.22);
  white-space:nowrap;
}
.tag--orange{background:rgba(228,87,46,.12);color:#A83A19;border-color:rgba(228,87,46,.36)}
.tag--moss{background:rgba(107,127,91,.16);color:#4A5A3D;border-color:rgba(107,127,91,.42)}
.tag--cyan{background:rgba(53,208,186,.16);color:var(--cyan-deep);border-color:rgba(53,208,186,.46)}

/* ---------- 10. 图片容器 ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;border-radius:var(--radius);
  background:linear-gradient(140deg,var(--navy-700),var(--navy-900));
  isolation:isolate;
}
.media > img,
.media > picture > img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(255,255,255,.05) 0 1px,transparent 1px 3px);
  opacity:.5;mix-blend-mode:overlay;
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__caption{
  position:absolute;inset-inline:0;inset-block-end:0;z-index:1;
  padding:.7rem .9rem;
  background:linear-gradient(to top,rgba(7,26,44,.94),rgba(7,26,44,0));
  color:var(--cream);font-size:.82rem;line-height:1.6;
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--navy-900);
  color:rgba(245,241,232,.74);
  padding-block:clamp(2.2rem,5vw,3.4rem) 1.4rem;
}
.site-footer::before{
  content:"";position:absolute;inset-block-start:0;inset-inline:0;height:6px;
  background:linear-gradient(90deg,
    var(--orange-600) 0 18%,
    var(--terracotta) 18% 32%,
    var(--cyan-400) 32% 40%,
    var(--navy-700) 40% 100%);
}
.site-footer::after{
  content:"";position:absolute;inset-block-start:0;inset-inline-start:0;
  width:min(70%,560px);height:100%;pointer-events:none;
  background:linear-gradient(118deg,rgba(53,208,186,.09),transparent 62%);
}
.site-footer__inner{
  position:relative;z-index:1;
  width:min(calc(100% - var(--gutter) * 2),var(--shell));
  margin-inline:auto;
  display:grid;gap:clamp(1.8rem,4vw,2.8rem);
}
.site-footer__brand{display:grid;gap:.55rem;align-content:start}
.site-footer__name{
  font-family:var(--font-head);font-size:1.3rem;font-weight:800;
  color:var(--white);line-height:1.35;
}
.site-footer__tag{
  font-size:.95rem;color:var(--cyan-400);letter-spacing:.05em;max-width:none;
}
.site-footer__note{font-size:.85rem;line-height:1.75;color:rgba(245,241,232,.55);max-width:34ch}
.site-footer__nav{
  display:grid;gap:clamp(1.3rem,3vw,1.9rem);
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
}
.footer-col__title{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cyan-400);margin-block-end:.75rem;
}
.footer-col__list{display:grid;gap:.34rem}
.footer-col__list a{
  display:inline-block;padding-block:.16rem;
  font-size:.92rem;color:rgba(245,241,232,.72);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-col__list a:hover{color:var(--white);transform:translateX(3px)}
.footer-col__list--plain li{
  font-size:.88rem;line-height:1.7;color:rgba(245,241,232,.6);
  padding-block:.1rem;
}
.site-footer__meta{
  grid-column:1/-1;
  display:flex;flex-wrap:wrap;gap:.5rem 1.6rem;
  align-items:center;justify-content:space-between;
  margin-block-start:.4rem;padding-block-start:1.2rem;
  border-block-start:1px solid var(--line-light);
  font-size:.8rem;color:rgba(245,241,232,.5);
}
.site-footer__meta p{max-width:none}

/* 回到顶部 */
.to-top{
  position:fixed;inset-block-end:1.4rem;inset-inline-end:1.4rem;
  z-index:120;
  width:46px;height:46px;
  display:grid;place-items:center;
  font-size:1.05rem;font-weight:700;
  background:var(--navy-800);color:var(--cream);
  border:1px solid rgba(53,208,186,.42);border-radius:50%;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),
             visibility var(--dur) var(--ease),background var(--dur) var(--ease);
}
.to-top[data-visible]{
  opacity:1;visibility:visible;transform:translateY(0);
}
.to-top:hover{background:var(--navy-700);color:var(--cyan-400)}

/* ---------- 12. 断点 ---------- */
@media (min-width:1024px){
  body{padding-inline-start:var(--rail)}
  .brand-rail{
    position:fixed;inset-block:0;inset-inline-start:0;
    z-index:70;
    width:var(--rail);
    display:flex;flex-direction:column;gap:1.5rem;
    padding:1.7rem 1.35rem 1.7rem;
    background:var(--navy-800);
    color:var(--cream);
    border-inline-end:1px solid rgba(53,208,186,.2);
    overflow-y:auto;
    overflow-x:hidden;
  }
  .brand-rail::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background:
      linear-gradient(158deg,rgba(53,208,186,.12),transparent 46%),
      repeating-linear-gradient(-58deg,rgba(255,255,255,.035) 0 2px,transparent 2px 13px);
  }
  .brand-rail > *{position:relative;z-index:1}
  .site-footer__inner{grid-template-columns:minmax(210px,1fr) minmax(0,2.5fr)}
}

@media (max-width:1023px){
  .navbar{flex-wrap:wrap}
  .navbar__brand{display:block}
  .nav-toggle{display:inline-flex}
  .main-nav{
    position:absolute;inset-inline:0;inset-block-start:100%;
    z-index:80;
    display:none;
    background:var(--navy-900);
    border-block-end:3px solid var(--orange-600);
    max-height:min(72vh,540px);
    overflow-y:auto;
    box-shadow:0 24px 40px -26px rgba(0,0,0,.85);
  }
  .main-nav[data-open]{display:block}
  .main-nav__list{
    flex-direction:column;align-items:stretch;gap:0;
    padding:.6rem var(--gutter) 1.1rem;
  }
  .main-nav__list a{
    padding:.8rem .2rem;font-size:1rem;
    border-block-end:1px solid var(--line-light);
    border-radius:0;
  }
  .main-nav__list a[aria-current="page"]{background:transparent;color:var(--cyan-400)}
  .main-nav__list a[aria-current="page"]::after{inset-inline:.2rem;inset-block-end:.42rem}
  .main-nav__cta-item{display:block;margin-block-start:1rem}
  .main-nav__cta-item a{
    width:100%;border:0;padding:.78rem 1rem;
  }
  .main-nav__cta-item a[aria-current="page"]{background:var(--cyan-400);color:var(--navy-900)}
  .main-nav__cta-item a[aria-current="page"]::after{content:none}
}

@media (max-width:900px){
  .site-footer__inner{grid-template-columns:1fr}
}

@media (max-width:767px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .topline{justify-content:flex-start}
  .to-top{inset-block-end:1rem;inset-inline-end:1rem;width:42px;height:42px}
}

@media (max-width:479px){
  .main-nav__list a{font-size:.96rem}
  .footer-col__list--plain li{font-size:.84rem}
}

/* ---------- 13. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
    scroll-behavior:auto !important;
  }
  .panel:hover,.btn:hover,.footer-col__list a:hover{transform:none}
}