/* /assets/site.css — M8体育共享外壳与基础组件 */

:root{
  --sky-abyss:#0A1633;
  --sky-panel:#101F42;
  --sky-card:#1B2C55;
  --cool:#7E93B8;
  --fog:#C9D6E8;
  --teal:#1FA5A0;
  --teal-mist:#6FD3CE;
  --orange:#FF6A1A;
  --amber:#FF9E4D;
  --paper:#F4F1E9;
  --print-line:#D8D2C4;
  --line-soft:rgba(216,210,196,.18);
  --line-strong:rgba(216,210,196,.34);
  --ink-dark:#101F42;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --wrap-max:1200px;
  --gutter:clamp(16px,4vw,40px);
  --radius:2px;
  --step-fast:180ms;
  --step-base:240ms;
}

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

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

body{
  margin:0;
  background-color:var(--sky-abyss);
  background-image:
    radial-gradient(1100px 520px at 82% -12%,rgba(31,165,160,.16),transparent 62%),
    radial-gradient(760px 420px at 6% 4%,rgba(255,106,26,.08),transparent 66%),
    repeating-linear-gradient(0deg,rgba(216,210,196,.04) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(90deg,rgba(216,210,196,.04) 0 1px,transparent 1px 96px);
  color:var(--fog);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

img,svg,video{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{margin:0;color:#fff;font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;line-height:1.12}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:var(--teal-mist);text-decoration:none}
a:hover{color:#fff}

:focus-visible{outline:2px solid var(--teal-mist);outline-offset:3px}

.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-64px;
  z-index:90;
  padding:10px 16px;
  background:var(--paper);
  color:var(--ink-dark);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:var(--radius);
  transition:top var(--step-fast) ease;
}
.skip-link:focus{top:12px;color:var(--ink-dark)}

/* ---------- 刊头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(10,22,51,.98),rgba(10,22,51,.9));
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.masthead{border-bottom:1px solid var(--line-strong);position:relative}
.masthead__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  column-gap:clamp(12px,2vw,28px);
  padding-block:clamp(12px,2vw,20px);
  transition:padding var(--step-base) ease;
}
.site-header[data-scrolled] .masthead__inner{padding-block:8px}

.masthead__brand{display:flex;flex-direction:column;gap:3px;text-decoration:none;min-width:0}
.masthead__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.5rem,4vw,2.3rem);
  line-height:1;
  letter-spacing:.01em;
  color:#fff;
  transition:font-size var(--step-base) ease;
}
.site-header[data-scrolled] .masthead__name{font-size:clamp(1.25rem,3vw,1.6rem)}
.masthead__subline{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--teal-mist);
  transition:opacity var(--step-base) ease,transform var(--step-base) ease;
}
.site-header[data-scrolled] .masthead__subline{opacity:0;transform:translateY(-4px);pointer-events:none}

.site-nav{justify-self:center;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.6vw,22px)}
.site-nav__link{
  display:block;
  padding:8px 2px;
  color:var(--fog);
  font-size:15px;
  letter-spacing:.06em;
  border-bottom:2px solid transparent;
  transition:color var(--step-fast) ease,border-color var(--step-fast) ease;
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:#fff;border-bottom-color:var(--teal-mist)}
.site-nav__link[aria-current="page"]{color:#fff;border-bottom-color:var(--orange)}

.masthead__actions{justify-self:end}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  justify-self:end;
  padding:10px 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  color:var(--fog);
  font-size:13px;
  letter-spacing:.12em;
}
.nav-toggle:hover{border-color:var(--teal-mist);color:#fff}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bar{display:block;height:2px;background:var(--teal-mist);transition:transform var(--step-fast) ease,opacity var(--step-fast) ease}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{font-family:var(--font-mono)}

.masthead__progress{height:2px;background:rgba(216,210,196,.14);overflow:hidden}
.masthead__progress-bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal),var(--teal-mist) 55%,var(--orange));
  transition:transform 120ms linear;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1;
  text-decoration:none;
  cursor:pointer;
  transition:background var(--step-fast) ease,color var(--step-fast) ease,border-color var(--step-fast) ease,transform var(--step-fast) ease;
}
.btn--signal{background:var(--orange);color:#190A02;border-color:var(--orange)}
.btn--signal:hover,.btn--signal:focus-visible{background:var(--amber);border-color:var(--amber);color:#190A02;transform:translateY(-2px)}
.btn--teal{background:var(--teal);color:#03201F;border-color:var(--teal)}
.btn--teal:hover,.btn--teal:focus-visible{background:var(--teal-mist);border-color:var(--teal-mist);color:#03201F}
.btn--ghost{background:transparent;color:var(--fog);border-color:var(--line-strong)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--teal-mist);color:#fff}
.btn--small{padding:8px 14px;font-size:13px}

/* ---------- 容器与网格 ---------- */
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.span-3{grid-column:span 3}
.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:1 / -1}

.section{padding-block:clamp(28px,5vw,56px)}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;margin-bottom:clamp(16px,2.4vw,24px)}
.section__title{font-size:clamp(1.6rem,3.2vw,2.25rem);letter-spacing:-.01em}
.page-title{font-size:clamp(2rem,5vw,3.5rem);line-height:1;letter-spacing:-.02em;margin-bottom:12px}

.label{
  display:inline-block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--cool);
}
.label--teal{color:var(--teal-mist)}
.label--orange{color:var(--amber)}

.rule{position:relative;height:1px;border:0;background:var(--line-soft);margin:clamp(24px,4vw,40px) 0}
.rule::after{content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;background:var(--teal)}

.prose{max-width:34em}
.prose p{margin-bottom:1.05em}
.prose h3{font-size:20px;margin:1.4em 0 .5em}
.prose ul{list-style:disc;padding-left:1.2em;margin-bottom:1.05em}
.prose li{margin-bottom:.35em}

/* ---------- 面包屑 ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--cool);padding-top:clamp(16px,3vw,28px)}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__link{color:var(--fog);border-bottom:1px solid var(--line-soft)}
.breadcrumbs__link:hover{color:#fff;border-bottom-color:var(--teal-mist)}
.breadcrumbs__sep{color:var(--cool);opacity:.7}
.breadcrumbs__current{color:var(--teal-mist)}

/* ---------- 卡片（纸张叠层） ---------- */
.card{
  position:relative;
  display:block;
  padding:clamp(16px,2.2vw,24px);
  background:var(--sky-card);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  color:var(--fog);
  text-decoration:none;
  transition:transform var(--step-base) ease,border-color var(--step-base) ease,background var(--step-base) ease;
}
a.card:hover,a.card:focus-visible,.card:hover{transform:translateY(-4px);border-color:rgba(111,211,206,.5)}
.card--quiet{background:var(--sky-panel)}
.card--paper{background:var(--paper);color:#161E36;border-color:var(--print-line)}
.card--paper .card__title{color:var(--ink-dark)}
.card--paper .card__meta,.card--paper .card__body{color:#4C5670}
.card--fold::after{
  content:"";
  position:absolute;
  top:-1px;
  right:-1px;
  width:20px;
  height:20px;
  background:var(--teal);
  clip-path:polygon(100% 0,100% 100%,0 0);
}
.card--signal::after{background:var(--orange)}
.card__head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.card__title{font-family:var(--font-display);font-weight:700;font-size:20px;line-height:1.25;margin-bottom:8px;color:#fff}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--cool);font-variant-numeric:tabular-nums}
.card__body{font-size:15px;line-height:1.7;color:var(--fog)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:rgba(126,147,184,.08);
  color:var(--cool);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
}
.tag--teal{color:var(--teal-mist);border-color:rgba(31,165,160,.5);background:rgba(31,165,160,.12)}
.tag--orange{color:var(--amber);border-color:rgba(255,106,26,.5);background:rgba(255,106,26,.12)}

/* ---------- 数字与数据模块 ---------- */
.score{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  letter-spacing:.02em;
  color:#fff;
}
.score--signal{color:var(--orange)}
.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.5rem,3vw,2rem);
  line-height:1;
  color:#fff;
}
.stat__label{font-size:13px;letter-spacing:.12em;color:var(--cool)}

/* ---------- 图片容器（供页面阶段放置图片） ---------- */
.media{
  position:relative;
  overflow:hidden;
  background:var(--sky-card);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
}
.media::before{content:"";display:block;padding-top:56.25%}
.media--wide::before{padding-top:42%}
.media--square::before{padding-top:100%}
.media--portrait::before{padding-top:125%}
.media > img,.media__ph{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__ph{
  background-image:
    linear-gradient(135deg,rgba(31,165,160,.34),rgba(10,22,51,.92) 62%),
    repeating-linear-gradient(0deg,rgba(216,210,196,.07) 0 1px,transparent 1px 28px);
}
.media__ph::after{
  content:attr(data-label);
  position:absolute;
  left:14px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--paper);
}
.media__caption{
  display:block;
  padding:10px 0 0;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--cool);
}

/* ---------- 章节索引栏 ---------- */
.anchor-nav{
  position:sticky;
  top:104px;
  display:flex;
  flex-direction:column;
  border-left:1px solid var(--line-soft);
}
.anchor-nav__link{
  position:relative;
  margin-left:-1px;
  padding:8px 12px;
  border-left:2px solid transparent;
  color:var(--cool);
  font-size:13px;
  letter-spacing:.1em;
  text-decoration:none;
  transition:color var(--step-fast) ease,border-color var(--step-fast) ease,background var(--step-fast) ease;
}
.anchor-nav__link:hover{color:var(--fog);border-left-color:var(--teal-mist)}
.anchor-nav__link.is-active{color:var(--orange);border-left-color:var(--orange);background:rgba(255,106,26,.08)}

/* ---------- 显现动效 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity 320ms ease,transform 320ms ease;
}
html[data-js="on"] [data-reveal][data-visible]{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--sky-panel);
  border-top:1px solid var(--line-strong);
  color:var(--fog);
}
.footer__inner{
  display:grid;
  grid-template-columns:1.5fr repeat(2,minmax(0,1fr)) 1.4fr;
  gap:clamp(20px,4vw,48px);
  padding-block:clamp(32px,6vw,64px);
}
.footer__brand{display:flex;flex-direction:column;gap:8px}
.footer__name{font-family:var(--font-display);font-weight:800;font-size:clamp(1.6rem,3.4vw,2.2rem);line-height:1;color:#fff}
.footer__subline{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--teal-mist)}
.footer__tagline{font-size:15px;color:var(--fog);max-width:22em}
.footer__meta{font-size:13px;line-height:1.7;color:var(--cool);max-width:24em}
.footer__nav{display:flex;flex-direction:column;gap:12px}
.footer__col-title{
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--cool);
  padding-bottom:8px;
  border-bottom:1px solid var(--line-soft);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{color:var(--fog);font-size:15px;border-bottom:1px solid transparent}
.footer__link:hover{color:#fff;border-bottom-color:var(--teal-mist)}
.footer__contact{display:flex;flex-direction:column;gap:12px}
.footer__line{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--fog)}
.footer__key{min-width:4.5em;font-size:13px;letter-spacing:.1em;color:var(--cool)}
.footer__mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:#fff;word-break:break-all}
.footer__copy{
  padding:3px 10px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--teal-mist);
  transition:border-color var(--step-fast) ease,color var(--step-fast) ease,background var(--step-fast) ease;
}
.footer__copy:hover{border-color:var(--teal-mist);color:#fff}
.footer__copy[data-state="done"]{background:var(--teal);border-color:var(--teal);color:#03201F}
.footer__legal{border-top:1px solid var(--line-soft);background:var(--sky-abyss)}
.footer__legal-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:16px;
}
.footer__legal-line,.footer__copyright{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--cool);
}

/* ---------- 平板 / 移动 ---------- */
@media (max-width:899px){
  .masthead__inner{grid-template-columns:minmax(0,1fr) auto auto;column-gap:10px}
  .masthead__actions .btn{padding:10px 14px;font-size:13px}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    justify-self:stretch;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    background:var(--sky-panel);
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid var(--line-strong);
    transition:max-height var(--step-base) ease,visibility var(--step-base) ease;
  }
  .site-header[data-open] .site-nav{max-height:min(72vh,540px);overflow:auto;visibility:visible}
  .site-nav__list{display:block;padding:6px var(--gutter) 18px}
  .site-nav__item{border-bottom:1px solid var(--line-soft)}
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__link{
    padding:14px 0 14px 12px;
    font-size:16px;
    border-bottom:0;
    border-left:2px solid transparent;
  }
  .site-nav__link:hover,.site-nav__link:focus-visible{border-bottom-color:transparent;border-left-color:var(--teal-mist)}
  .site-nav__link[aria-current="page"]{border-bottom-color:transparent;border-left-color:var(--orange)}

  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-5,.span-7,.span-8{grid-column:span 6}

  .anchor-nav{position:static;flex-direction:row;flex-wrap:wrap;gap:0;border-left:0;border-top:1px solid var(--line-soft)}

  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__brand,.footer__contact{grid-column:1 / -1}
}

@media (max-width:639px){
  body{font-size:16px}
  .nav-toggle__text{display:none}
  .masthead__actions .btn{padding:9px 12px}
  .grid--12{grid-template-columns:1fr}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8{grid-column:1 / -1}
  .footer__inner{grid-template-columns:1fr}
  .footer__brand,.footer__contact{grid-column:auto}
  .footer__legal-inner{flex-direction:column;align-items:flex-start}
  .footer__key{min-width:auto;flex:0 0 100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html[data-js="on"] [data-reveal]{opacity:1;transform:none}
  .masthead__progress-bar{transition:none}
}