/* ============================================================
   6t体育指南 / assets/site.css
   共享外壳：reset · 变量 · 中文排版 · 页头 · 页脚 · 通用组件
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

:root{
  --bg:#070B14;
  --panel:#0F1826;
  --panel-2:#132033;
  --edge:#1C2A40;
  --edge-soft:rgba(28,42,64,.55);
  --cyan:#4DE0FF;
  --orange:#FF7A29;
  --rose:#FF3D81;
  --grass:#3FD68C;
  --amber:#F2C14E;
  --white:#E9F0FA;
  --muted:#8FA2BC;
  --rail:272px;
  --wrap:1220px;
  --font-ui:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;
  --shadow-deep:0 26px 60px -34px rgba(0,0,0,.95);
}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--bg);
  background-image:
    radial-gradient(900px 520px at 84% -10%, rgba(77,224,255,.11), transparent 62%),
    radial-gradient(780px 500px at 2% 106%, rgba(255,122,41,.09), transparent 60%);
  background-attachment:fixed;
  color:var(--white);
  font-family:var(--font-ui);
  font-size:15px;
  line-height:1.75;
  letter-spacing:.004em;
  -webkit-font-smoothing:antialiased;
}

body.nav-open{overflow:hidden}

/* ---------- 中文排版基准 ---------- */
h1,h2,h3,h4,h5,h6{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.14}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--cyan);text-decoration:none;transition:color .2s ease}
a:hover{color:#8CEAFF}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
strong,b{font-weight:800}

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

/* ---------- 排版原子 ---------- */
.display{
  font-size:clamp(28px,5.4vw,60px);
  font-weight:900;
  letter-spacing:-.035em;
  line-height:1.04;
  text-transform:uppercase;
  color:#FFF;
}
.lead{font-size:16px;line-height:1.8;color:var(--muted);max-width:62ch}
.label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}
.muted{color:var(--muted)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
  margin:0 0 14px;
}
.eyebrow::before{
  content:"";
  width:24px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}

/* ---------- 布局容器 ---------- */
.wrap{
  width:min(100% - 32px, var(--wrap));
  margin-inline:auto;
}
.wrap--narrow{
  width:min(100% - 32px, 780px);
  margin-inline:auto;
}
.section{padding:64px 0}
.section--tight{padding:34px 0}

.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(238px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(186px,1fr))}

.grid-field{
  background-image:
    linear-gradient(var(--edge-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--edge-soft) 1px,transparent 1px);
  background-size:36px 36px;
}
.divider{
  height:1px;
  border:0;
  margin:34px 0;
  background:linear-gradient(90deg,var(--edge),transparent 72%);
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:120;
  padding:10px 16px;
  background:var(--cyan);
  color:#04121C;
  font-size:13px;
  font-weight:800;
  letter-spacing:.06em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0);color:#04121C}

/* ============================================================
   页头 —— 桌面纵向轨道 / 移动顶栏 + 抽屉
   ============================================================ */
.site-header{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail);
  z-index:60;
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:26px 22px 22px;
  background:
    linear-gradient(180deg,rgba(77,224,255,.07),transparent 32%),
    var(--panel);
  border-right:1px solid var(--edge);
  overflow:hidden auto;
  overscroll-behavior:contain;
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:2px;
  height:32%;
  pointer-events:none;
  background:linear-gradient(180deg,transparent,var(--cyan),transparent);
  opacity:.55;
  animation:scan-y 9s linear infinite;
}
@keyframes scan-y{
  0%{transform:translateY(-110%)}
  100%{transform:translateY(340%)}
}

.scroll-progress{
  position:fixed;
  top:0;
  left:var(--rail);
  right:0;
  height:2px;
  z-index:80;
  pointer-events:none;
  background:rgba(28,42,64,.5);
}
.scroll-progress span{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--grass) 46%,var(--orange));
}

.rail-top{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  color:var(--white);
  text-decoration:none;
}
.brand:hover{color:var(--white)}
.brand-mark{
  flex:0 0 auto;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:17px;
  font-weight:700;
  letter-spacing:.02em;
  color:#04121C;
  background:linear-gradient(140deg,var(--cyan),#25A9CE);
  clip-path:polygon(13% 0,100% 0,87% 100%,0 100%);
  box-shadow:0 0 0 1px rgba(77,224,255,.35),0 0 26px -8px rgba(77,224,255,.85);
}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{
  font-size:17px;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.08;
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--muted);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:transparent;
  border:1px solid var(--edge);
  border-radius:2px 12px 2px 2px;
  color:var(--white);
  font-size:12.5px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{border-color:rgba(77,224,255,.5);background:rgba(77,224,255,.07)}
.nav-toggle-bars{position:relative;width:16px;height:10px;flex:0 0 auto}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:var(--cyan);
  transition:transform .22s ease;
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
}

.site-nav{display:flex;flex-direction:column;gap:4px}

.nav-kicker{
  margin:0 0 10px;
  padding-left:2px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--muted);
}

.nav-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.nav-list a{
  position:relative;
  display:flex;
  align-items:center;
  gap:11px;
  padding:10px 12px;
  border-radius:2px 14px 2px 2px;
  border-left:2px solid transparent;
  color:var(--white);
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.01em;
  text-decoration:none;
  transition:background .2s ease,border-color .2s ease,color .2s ease;
}
.nav-list a::before{
  content:"";
  flex:0 0 auto;
  width:6px;
  height:6px;
  background:var(--edge);
  transform:rotate(45deg);
  transition:background .2s ease,box-shadow .2s ease;
}
.nav-list a:hover{
  background:rgba(77,224,255,.08);
  border-left-color:rgba(77,224,255,.5);
  color:#FFF;
}
.nav-list a:hover::before{background:var(--cyan)}
.nav-list a[aria-current="page"]{
  background:linear-gradient(90deg,rgba(77,224,255,.15),transparent 82%);
  border-left-color:var(--cyan);
  color:#FFF;
}
.nav-list a[aria-current="page"]::before{
  background:var(--cyan);
  box-shadow:0 0 12px var(--cyan);
}

.nav-foot{
  margin-top:auto;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding-top:20px;
  border-top:1px dashed var(--edge);
}
.nav-meta{
  margin:0;
  text-align:center;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--muted);
}

.nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  z-index:55;
  border:0;
  background:rgba(4,8,16,.74);
}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid transparent;
  border-radius:2px 14px 2px 2px;
  font-size:13.5px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{
  background:linear-gradient(135deg,#FF9550,var(--orange));
  color:#160800;
  box-shadow:0 12px 28px -16px rgba(255,122,41,.95);
}
.btn-primary:hover{color:#160800;transform:translateY(-1px);box-shadow:0 16px 32px -14px rgba(255,122,41,1)}
.btn-ghost{
  background:transparent;
  color:var(--cyan);
  border-color:rgba(77,224,255,.42);
}
.btn-ghost:hover{background:rgba(77,224,255,.1);color:#9BEEFF;border-color:var(--cyan)}
.btn-full{width:100%}
.btn-sm{padding:8px 13px;font-size:12.5px}

/* ============================================================
   面包屑 / 数据面板 / 标记
   ============================================================ */
.breadcrumb{
  margin:0 0 18px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--muted);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  list-style:none;
  margin:0;
  padding:0;
}
.breadcrumb li{display:flex;align-items:center;gap:6px}
.breadcrumb li::after{content:"/";color:var(--edge)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--white)}

.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--edge);
  border-radius:2px 20px 2px 2px;
  padding:22px;
  box-shadow:var(--shadow-deep);
}
.panel::before{
  content:"";
  position:absolute;
  top:-1px;
  left:14px;
  width:40px;
  height:2px;
  background:var(--cyan);
}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:14px;
}
.panel-title{font-size:15px;font-weight:800;letter-spacing:.01em}
.panel-body{font-size:14px;color:var(--muted)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--edge);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(77,224,255,.45);background:rgba(77,224,255,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,41,.45);background:rgba(255,122,41,.08)}
.tag--rose{color:var(--rose);border-color:rgba(255,61,129,.45);background:rgba(255,61,129,.08)}
.tag--grass{color:var(--grass);border-color:rgba(63,214,140,.45);background:rgba(63,214,140,.08)}
.tag--amber{color:var(--amber);border-color:rgba(242,193,78,.45);background:rgba(242,193,78,.08)}

/* ============================================================
   图片容器（页面阶段放入 <img>，无图时保留网格底）
   ============================================================ */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:
    linear-gradient(160deg,#0E1828,#080E19),
    var(--panel);
  border:1px solid var(--edge);
  border-radius:2px 22px 2px 2px;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.86) contrast(1.08) brightness(.82);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(77,224,255,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(77,224,255,.09) 1px,transparent 1px);
  background-size:48px 48px;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--free{aspect-ratio:auto;min-height:220px}
.media-caption{
  display:block;
  margin-top:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
}

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

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:84px;
  padding:52px 0 26px;
  background:linear-gradient(180deg,#0B1421,var(--bg) 72%);
  border-top:1px solid var(--edge);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:min(340px,54%);
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange),transparent);
}

.footer-grid{
  width:min(100% - 32px, var(--wrap));
  margin-inline:auto;
  display:grid;
  gap:32px;
  grid-template-columns:1.4fr 1fr 1.3fr;
}

.footer-brand .brand-mark{
  width:40px;
  height:40px;
  font-size:15px;
}
.footer-title{
  margin:14px 0 6px;
  font-size:16px;
  font-weight:800;
  letter-spacing:-.01em;
}
.footer-note{margin:0;font-size:13.5px;color:var(--muted);max-width:34ch}

.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--muted);
}
.footer-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:9px;
}
.footer-list a{
  color:var(--white);
  font-size:14px;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-list a:hover{color:var(--cyan);border-color:rgba(77,224,255,.55)}
.footer-list--meta li{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-size:13.5px;
}
.footer-list--meta .label{flex:0 0 34px}
.footer-value{
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--white);
  word-break:break-word;
}

.footer-base{
  width:min(100% - 32px, var(--wrap));
  margin:36px auto 0;
  padding-top:16px;
  border-top:1px dashed var(--edge);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 22px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
}
.footer-copy,.footer-icp,.footer-stamp{margin:0}
.footer-stamp{margin-left:auto}
.footer-stamp a{
  color:var(--muted);
  border-bottom:1px solid var(--edge);
}
.footer-stamp a:hover{color:var(--cyan);border-color:var(--cyan)}

.back-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:56;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 15px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--white);
  background:rgba(15,24,38,.94);
  border:1px solid var(--edge);
  border-radius:2px 14px 2px 2px;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(9px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease,border-color .22s ease,color .22s ease;
}
.back-top[data-visible]{
  opacity:1;
  visibility:visible;
  transform:none;
}
.back-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ============================================================
   断点
   ============================================================ */
@media (min-width:1024px){
  body{padding-left:var(--rail)}
  .site-nav{flex:1 1 auto;min-height:0}
}

@media (min-width:1024px) and (max-width:1279.98px){
  :root{--rail:238px}
  .site-header{padding:20px 16px 18px}
  .brand-name{font-size:15px}
  .brand-mark{width:42px;height:42px;font-size:15px}
  .nav-list a{font-size:13.5px;padding:9px 10px}
}

@media (max-width:1023.98px){
  body{padding-left:0}

  .site-header{
    position:sticky;
    top:0;
    left:auto;
    right:auto;
    bottom:auto;
    width:100%;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:10px 16px;
    background:rgba(9,15,26,.98);
    border-right:0;
    border-bottom:1px solid var(--edge);
    overflow:visible;
  }
  .site-header::after{display:none}

  .rail-top{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    width:100%;
    gap:12px;
  }
  .brand-mark{width:38px;height:38px;font-size:14px}
  .brand-name{font-size:15.5px}
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex}

  .scroll-progress{left:0}

  .site-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    width:min(86vw,340px);
    z-index:58;
    display:flex;
    flex-direction:column;
    gap:18px;
    padding:80px 20px 26px;
    background:linear-gradient(180deg,#101C2E,#0A1220);
    border-left:1px solid var(--edge);
    box-shadow:-26px 0 60px -30px rgba(0,0,0,.95);
    transform:translateX(102%);
    transition:transform .3s cubic-bezier(.4,0,.2,1);
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .site-nav[data-open]{transform:none}

  .nav-foot{margin-top:auto}

  .nav-scrim:not([hidden]){
    display:block;
  }

  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:640px){
  .section{padding:46px 0}
  .section--tight{padding:26px 0}

  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-stamp{margin-left:0;flex-basis:100%}
  .footer-base{gap:8px 16px}
  .back-top{right:12px;bottom:12px;padding:9px 13px}
  .panel{padding:18px}
}

/* ============================================================
   减弱动效
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .site-header::after{display:none}
  [data-reveal]{opacity:1;transform:none}
}