/* ==========================================================================
   四季体育 · 共享样式表  /assets/site.css
   深墨基底 + 暖纸呼吸区 + 四季轮转强调色 + 荧光脉冲
   ========================================================================== */

:root{
  --ink:#0A0E13;
  --ink-raise:#131A22;
  --paper:#F1EAE0;
  --paper-2:#D9D1C4;
  --spring:#1FC98E;
  --summer:#FF7A1A;
  --autumn:#F2B01F;
  --winter:#46C2F0;
  --pulse:#B8FF3D;
  --muted:#7C8896;
  --line:#26303B;
  --line-paper:#C9C0B1;

  --shell:1320px;
  --gutter:clamp(16px,4vw,44px);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --ease:cubic-bezier(0.22,1,0.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:136px;
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:300;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line);margin:0}
:focus-visible{outline:2px solid var(--pulse);outline-offset:3px;border-radius:2px}
::selection{background:var(--pulse);color:var(--ink)}

/* ---------- 排版基础 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-0.01em}
.u-slant{display:inline-block;transform:skewX(-8deg)}
.label{
  display:inline-block;
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--muted);
}
.rule{border-top:1px solid var(--line)}
.section--paper .rule{border-top-color:var(--line-paper)}

/* ---------- 布局骨架 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding:clamp(56px,8vw,112px) 0}
.section--paper{background:var(--paper);color:var(--ink-raise)}
.section--paper .label{color:#5A6472}
.section--raise{background:var(--ink-raise)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 28px;
  margin-bottom:clamp(24px,4vw,44px);
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.section--paper .section__head{border-bottom-color:var(--line-paper)}
.section__title{
  font-family:var(--font-display);
  font-size:clamp(26px,4vw,52px);
  font-weight:900;
  letter-spacing:-0.02em;
  line-height:1.06;
}

.grid12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ---------- 正文容器 ---------- */
.prose{max-width:40em;font-size:17px;line-height:1.85;font-weight:300}
.prose > * + *{margin-top:1.05em}
.prose h2{
  font-family:var(--font-display);
  font-size:clamp(22px,3vw,34px);
  font-weight:800;
  letter-spacing:-0.01em;
  line-height:1.2;
  margin-top:2em;
}
.prose h3{font-size:18px;font-weight:600;margin-top:1.6em;letter-spacing:.01em}
.prose strong{font-weight:600}
.prose--paper{color:var(--ink-raise)}
.prose--paper strong{color:#05080C}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;
  font-size:14px;font-weight:600;letter-spacing:.06em;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(255,255,255,.02);
  color:var(--paper);
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.btn:hover{border-color:var(--paper-2);background:rgba(255,255,255,.06)}
.btn--pulse{background:var(--pulse);border-color:var(--pulse);color:var(--ink);font-weight:700}
.btn--pulse:hover{background:var(--pulse);color:var(--ink);box-shadow:0 0 0 4px rgba(184,255,61,.16)}
.btn--ghost{background:transparent}
.btn--paper{background:transparent;border-color:#B6AC9B;color:var(--ink-raise)}
.btn--paper:hover{border-color:var(--ink-raise);background:rgba(10,14,19,.05)}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:20px 0;
  font-size:12.5px;letter-spacing:.06em;color:var(--muted);
}
.crumbs__item{display:inline-flex;align-items:center;gap:8px}
.crumbs__item + .crumbs__item::before{content:"／";color:var(--line)}
.crumbs a:hover{color:var(--pulse)}
.section--paper .crumbs a:hover{color:#0A0E13}

/* ---------- 数据卡与面板 ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(44px,7vw,120px);
  line-height:.9;
  font-weight:600;
  letter-spacing:-0.03em;
  color:var(--paper);
}
.section--paper .stat__num{color:var(--ink-raise)}
.stat__unit{font-family:var(--font-body);font-size:.3em;letter-spacing:.08em;color:var(--muted);margin-left:.4em}
.stat__label{font-size:12px;letter-spacing:.1em;color:var(--muted)}

.panel{background:var(--ink-raise);border:1px solid var(--line);padding:clamp(18px,2.4vw,28px)}
.section--paper .panel{background:#E7DFD2;border-color:var(--line-paper)}
.panel__head{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px 16px;
  padding-bottom:12px;margin-bottom:16px;
  border-bottom:1px solid var(--line);
}
.section--paper .panel__head{border-bottom-color:var(--line-paper)}
.panel__title{font-size:14px;font-weight:600;letter-spacing:.06em}
.panel__note{font-size:12px;letter-spacing:.06em;color:var(--muted)}

/* ---------- 标签 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:2px;
  font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.tag--spring{color:var(--spring);border-color:rgba(31,201,142,.42)}
.tag--summer{color:var(--summer);border-color:rgba(255,122,26,.42)}
.tag--autumn{color:var(--autumn);border-color:rgba(242,176,31,.42)}
.tag--winter{color:var(--winter);border-color:rgba(70,194,240,.42)}

/* ---------- 坐标索引 ---------- */
.coord-index{border-top:1px solid var(--line)}
.section--paper .coord-index{border-top-color:var(--line-paper)}
.coord-index__item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;gap:6px 18px;
  padding:15px 0;
  border-bottom:1px solid var(--line);
  transition:background .2s var(--ease);
}
.section--paper .coord-index__item{border-bottom-color:var(--line-paper)}
.coord-index__item:hover{background:rgba(184,255,61,.05)}
.coord-index__key{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.coord-index__title{font-size:16px;color:var(--paper)}
.section--paper .coord-index__title{color:var(--ink-raise)}
.coord-index__meta{font-size:12px;letter-spacing:.06em;color:var(--muted)}

/* ---------- 图片容器基础规则（页面阶段使用） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:var(--ink-raise);
  border:1px solid var(--line);
}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:34px 14px 10px;
  font-size:12px;letter-spacing:.06em;color:var(--paper-2);
  background:linear-gradient(0deg,rgba(10,14,19,.9),rgba(10,14,19,0));
}
.data-overlay{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(70,194,240,.10) 1px,transparent 1px),
    linear-gradient(180deg,rgba(70,194,240,.10) 1px,transparent 1px);
  background-size:48px 48px;
}

/* ---------- 滚动显现 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ==========================================================================
   页头
   ========================================================================== */
.skip-link{
  position:fixed;left:50%;top:8px;z-index:200;
  transform:translate(-50%,-180%);
  padding:10px 18px;
  background:var(--pulse);color:var(--ink);
  font-size:14px;font-weight:700;letter-spacing:.06em;
  border-radius:2px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(180deg,rgba(10,14,19,.985),rgba(10,14,19,.93));
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  color:var(--paper);
}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--spring),var(--summer) 38%,var(--autumn) 68%,var(--winter));
  pointer-events:none;
  z-index:3;
}

.brandbar{
  display:flex;align-items:center;flex-wrap:wrap;
  gap:12px 18px;
  padding:12px 0 11px;
}
.brand{display:inline-flex;align-items:center;gap:12px;order:0}
.brand__logo{display:flex;align-items:flex-end;gap:3px;height:24px}
.brand__logo i{display:block;width:4px;border-radius:1px}
.brand__logo i:nth-child(1){height:24px;background:var(--spring)}
.brand__logo i:nth-child(2){height:16px;background:var(--summer)}
.brand__logo i:nth-child(3){height:20px;background:var(--autumn)}
.brand__logo i:nth-child(4){height:12px;background:var(--winter)}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{
  font-family:var(--font-display);
  font-size:19px;font-weight:900;letter-spacing:-0.01em;
  color:var(--paper);
}
.brand__tag{font-size:11.5px;letter-spacing:.16em;color:var(--muted)}

.brandbar__meta{
  display:flex;align-items:center;gap:20px;
  margin-left:auto;order:1;
}
.season-meta{display:flex;align-items:baseline;gap:18px;flex-wrap:wrap}
.meta-chip{display:inline-flex;align-items:baseline;gap:7px;font-size:12px;letter-spacing:.08em}
.meta-chip__k{color:var(--muted)}
.meta-chip__v{color:var(--paper);font-weight:500;font-size:13px}

.utility{display:flex;align-items:center;gap:16px}
.utility__link{
  font-size:12.5px;letter-spacing:.06em;color:var(--muted);
  padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.utility__link:hover,.utility__link:focus-visible{color:var(--pulse);border-bottom-color:var(--pulse)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  order:2;
  padding:9px 13px;
  border:1px solid var(--line);border-radius:2px;
  font-size:12.5px;letter-spacing:.1em;color:var(--paper-2);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--pulse);color:var(--pulse)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:1.5px;background:currentColor;transition:transform .26s var(--ease),opacity .18s var(--ease)}
.nav-toggle.is-open .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle.is-open .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle.is-open .nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

/* ---------- 赛季刻度导航 ---------- */
.timebar{position:relative;border-top:1px solid var(--line)}
.timebar__list{display:grid;grid-template-columns:repeat(6,minmax(0,1fr))}
.timebar__link{
  position:relative;
  display:grid;grid-template-columns:auto minmax(0,1fr);
  align-items:center;gap:0 10px;
  padding:15px 14px 17px;
  border-right:1px solid var(--line);
  font-size:14.5px;letter-spacing:.02em;
  color:var(--muted);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.timebar__list > li:last-child .timebar__link{border-right:0}
.timebar__link::before{
  content:"";position:absolute;top:-1px;left:14px;
  width:22px;height:2px;background:var(--line);
  transition:width .3s var(--ease),background .3s var(--ease),box-shadow .3s var(--ease);
}
.timebar__link:hover{color:var(--paper);background:rgba(255,255,255,.028)}
.timebar__link:hover::before{background:var(--paper-2);width:36px}
.timebar__link[aria-current="page"]{
  color:var(--paper);
  background:linear-gradient(180deg,rgba(184,255,61,.09),rgba(184,255,61,0));
}
.timebar__link[aria-current="page"]::before{
  width:54px;background:var(--pulse);
  box-shadow:0 0 14px rgba(184,255,61,.55);
}
.timebar__idx{font-size:11px;letter-spacing:.08em;color:var(--muted)}
.timebar__link[aria-current="page"] .timebar__idx{color:var(--pulse)}
.timebar__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  background:var(--ink-raise);
  color:var(--paper);
  border-top:1px solid var(--line);
  padding:64px 0 30px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:6px;
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 56px);
  pointer-events:none;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.55fr repeat(4,minmax(0,1fr));
  gap:36px 28px;
  padding-bottom:44px;
}
.footer-brand{max-width:36ch}
.footer-brand .brand__name{font-size:18px}
.footer-note{
  margin-top:16px;
  font-size:13.5px;line-height:1.75;color:var(--muted);
}
.seasons-strip{display:flex;gap:6px;margin-top:16px}
.seasons-strip span{
  font-size:11px;letter-spacing:.12em;line-height:1;
  padding:5px 8px;border-radius:2px;font-weight:600;
}
.seasons-strip span:nth-child(1){background:var(--spring);color:#06231A}
.seasons-strip span:nth-child(2){background:var(--summer);color:#2B1200}
.seasons-strip span:nth-child(3){background:var(--autumn);color:#2B1F00}
.seasons-strip span:nth-child(4){background:var(--winter);color:#04222E}

.footer-col__title{
  font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--muted);
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.footer-col__list{display:grid;gap:9px}
.footer-link{
  display:inline-block;
  font-size:14.5px;color:var(--paper-2);
  transition:color .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--pulse)}
.footer-text{font-size:13px;color:var(--muted);line-height:1.6;word-break:break-all}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;
  padding-top:20px;
  border-top:1px solid var(--line);
  font-size:12.5px;letter-spacing:.05em;color:var(--muted);
}
.footer-legal__item{margin:0}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1;max-width:46ch}
}

@media (max-width:1024px){
  .col-3,.col-4{grid-column:span 6}
  .col-8{grid-column:span 12}
}

@media (max-width:960px){
  html{scroll-padding-top:96px}

  .nav-toggle{display:inline-flex}

  .brandbar__meta{margin-left:auto;order:1}
  .nav-toggle{order:2}
  .season-meta{display:none}

  .timebar{
    position:absolute;left:0;right:0;top:100%;
    background:var(--ink-raise);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    box-shadow:0 24px 60px rgba(0,0,0,.55);
    transition:max-height .38s var(--ease),opacity .24s var(--ease),visibility .24s var(--ease);
  }
  .timebar[data-open="true"]{
    max-height:min(76vh,540px);
    overflow-y:auto;
    opacity:1;
    visibility:visible;
  }
  .timebar__list{grid-template-columns:1fr}
  .timebar__link{
    border-right:0;
    border-bottom:1px solid var(--line);
    padding:14px 16px;
    font-size:15.5px;
  }
  .timebar__list > li:last-child .timebar__link{border-bottom:0}
  .timebar__link::before{left:16px}
}

@media (max-width:720px){
  body{font-size:16px}
  .utility{display:none}
  .brand__name{font-size:17.5px}
}

@media (max-width:640px){
  .grid12 > *{grid-column:span 12}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .coord-index__item{grid-template-columns:auto minmax(0,1fr);row-gap:4px}
  .coord-index__meta{grid-column:2}
}

/* ==========================================================================
   可访问性与动效退化
   ========================================================================== */
@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-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
  .skip-link{transition:none}
}