/* ==========================================================================
   四季体育APP 中国区官网 · 共享样式 /assets/site.css
   深夜看台黑底 + 稿纸奶油面板 + 四季高对比点缀
   ========================================================================== */

:root{
  --ink:#0E1116;
  --ink-2:#1B1510;
  --cream:#F2EAD9;
  --cream-ink:#241C14;
  --orange:#FF5A36;
  --orange-soft:#FF8A6E;
  --blue:#2D9BF0;
  --spring-green:#4FD1A5;
  --spring-yellow:#F6E27A;
  --amber:#E0A100;
  --ice:#A8C7E8;
  --silver:#C9CDD4;

  --line:rgba(201,205,212,.22);
  --line-soft:rgba(201,205,212,.12);
  --line-strong:rgba(201,205,212,.45);
  --line-dark:rgba(36,28,20,.22);

  --season-accent:var(--orange);
  --season-soft:rgba(255,90,54,.14);

  --shell:1240px;
  --gutter:clamp(20px,4.5vw,96px);
  --gap:24px;

  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
}

html[data-season="spring"]{ --season-accent:var(--spring-green); --season-soft:rgba(79,209,165,.16); }
html[data-season="summer"]{ --season-accent:var(--orange); --season-soft:rgba(255,90,54,.16); }
html[data-season="autumn"]{ --season-accent:var(--amber); --season-soft:rgba(224,161,0,.16); }
html[data-season="winter"]{ --season-accent:var(--ice); --season-soft:rgba(168,199,232,.16); }

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

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

body{
  margin:0;
  min-height:100%;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(201,205,212,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,205,212,.045) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
  color:var(--cream);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg,video{ max-width:100%; display:block; }

a{ color:var(--blue); text-decoration:none; }
a:hover{ text-decoration:underline; }

h1,h2,h3,h4{
  margin:0;
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.02em;
  color:var(--cream);
}

p{ margin:0 0 1em; }
p:last-child{ margin-bottom:0; }

ul,ol{ margin:0; padding:0; }
li{ list-style:none; }

button{ font:inherit; color:inherit; }

:focus-visible{
  outline:2px solid var(--blue);
  outline-offset:2px;
}

::selection{ background:var(--orange); color:var(--cream-ink); }

/* --------------------------------------------------------- 排版族 --------- */
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--season-accent);
  margin:0 0 12px;
}

.section-title{
  font-size:clamp(26px,3.4vw,44px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
}

.section-lead{
  margin-top:14px;
  max-width:62ch;
  font-size:17px;
  color:rgba(242,234,217,.8);
}

.card-title{
  font-size:19px;
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
}

.card-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.75;
  color:rgba(242,234,217,.88);
}

.prose h2{ font-size:clamp(22px,2.4vw,30px); margin:2em 0 .6em; }
.prose h3{ font-size:20px; margin:1.6em 0 .5em; }
.prose ul{ margin:0 0 1.2em; }
.prose li{
  list-style:none;
  position:relative;
  padding-left:20px;
  margin-bottom:8px;
}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:10px;
  height:1px;
  background:var(--season-accent);
}

.prose--ink{ color:var(--cream-ink); }
.prose--ink h2,.prose--ink h3{ color:var(--cream-ink); }

/* --------------------------------------------------------- 布局 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{ padding-block:clamp(48px,7vw,96px); }
.section--tight{ padding-block:clamp(28px,3.6vw,52px); }

.grid{
  display:grid;
  gap:var(--gap);
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}

.split{ display:grid; gap:var(--gap); grid-template-columns:1fr; }
.split--5-7{ grid-template-columns:5fr 7fr; }
.split--4-8{ grid-template-columns:4fr 8fr; }
.split--3-9{ grid-template-columns:3fr 9fr; }

.stack{ display:flex; flex-direction:column; gap:var(--gap); }
.cluster{ display:flex; flex-wrap:wrap; align-items:center; gap:12px; }

.rule{
  height:1px;
  border:0;
  background:var(--line);
  margin:0;
}
.rule--tight{ background:var(--line-soft); }

/* --------------------------------------------------------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:14px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  background:transparent;
  transition:transform 180ms ease-out,border-color 180ms ease-out,background-color 180ms ease-out,color 180ms ease-out;
}
.btn:hover{ text-decoration:none; transform:translateY(-2px); }
.btn:active{ transform:translateY(0); }

.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:var(--cream-ink);
}
.btn--primary:hover{
  background:var(--orange-soft);
  border-color:var(--blue);
}

.btn--ghost{
  background:transparent;
  border-color:var(--line-strong);
  color:var(--cream);
}
.btn--ghost:hover{
  border-color:var(--blue);
  color:var(--blue);
}

.btn--quiet{
  padding:6px 0;
  border-color:transparent;
  color:var(--blue);
  border-bottom:1px solid var(--blue);
  border-radius:0;
}
.btn--quiet:hover{ color:var(--orange); border-bottom-color:var(--orange); }

.btn--sm{ padding:7px 12px; font-size:13px; }

/* --------------------------------------------------------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:2px 8px;
  border:1px solid currentColor;
  border-radius:2px;
  font-size:11px;
  font-weight:500;
  letter-spacing:.08em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--today{ color:var(--spring-green); }
.tag--history{ color:var(--amber); }
.tag--time{ color:var(--ice); }
.tag--live{ color:var(--orange-soft); }

/* --------------------------------------------------------- 面板 / Bento -- */
.panel{
  border:1px solid var(--line);
  background:rgba(27,21,16,.55);
  padding:clamp(20px,2.4vw,28px);
}
.panel--cream{
  background:var(--cream);
  color:var(--cream-ink);
  border-color:var(--line-dark);
}
.panel--ink{
  background:var(--ink-2);
  border-color:var(--line);
}

.bento{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:var(--gap);
}
.bento--s{ grid-column:span 3; }
.bento--m{ grid-column:span 4; }
.bento--l{ grid-column:span 6; }
.bento--xl{ grid-column:span 8; }
.bento--full{ grid-column:1 / -1; }

.bento-card{
  display:flex;
  flex-direction:column;
  gap:12px;
  border:1px solid var(--line);
  background:rgba(27,21,16,.5);
  padding:clamp(18px,2.2vw,26px);
  transition:transform 180ms ease-out,border-color 180ms ease-out,background-color 180ms ease-out;
}
.bento-card:hover{
  transform:translateY(-2px);
  border-color:var(--blue);
}
.panel--cream .bento-card{
  background:rgba(255,255,255,.5);
  border-color:var(--line-dark);
}

/* --------------------------------------------------------- 数据 ---------- */
.stat{ display:flex; flex-direction:column; gap:4px; }
.stat-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.6vw,48px);
  font-weight:600;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cream);
}
.stat-label{
  font-size:12px;
  letter-spacing:.08em;
  color:var(--silver);
}
.panel--cream .stat-value{ color:var(--cream-ink); }

/* --------------------------------------------------------- 面包屑 -------- */
.breadcrumb{ padding-block:16px; }
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--silver);
}
.breadcrumb-item{ display:inline-flex; align-items:center; gap:8px; }
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  color:var(--line-strong);
}
.breadcrumb-item a{ color:var(--silver); }
.breadcrumb-item a:hover{ color:var(--blue); }
.breadcrumb-item.is-current{ color:var(--cream); }

/* --------------------------------------------------------- 页面题头 ------ */
.masthead{
  padding-block:clamp(40px,6vw,88px);
  border-bottom:1px solid var(--line);
}
.masthead-title{
  font-size:clamp(32px,6vw,72px);
  font-weight:900;
  line-height:1.02;
  letter-spacing:-.02em;
}
.masthead-lead{
  margin-top:18px;
  max-width:60ch;
  font-size:18px;
  color:rgba(242,234,217,.8);
}
.masthead-meta{
  margin-top:22px;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}

/* 斜切动势（首屏与焦点区使用） */
.slash-bottom{ clip-path:polygon(0 0,100% 0,100% 88%,0 100%); }
.slash-top{ clip-path:polygon(0 12%,100% 0,100% 100%,0 100%); }

/* --------------------------------------------------------- 图片容器 ------ */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:1px solid var(--line);
  background-color:var(--ink-2);
  background-image:repeating-linear-gradient(135deg,rgba(201,205,212,.07) 0 1px,transparent 1px 12px);
}
.media img{
  position:relative;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--21x9{ aspect-ratio:21/9; }
.media--16x9{ aspect-ratio:16/9; }
.media--4x3{ aspect-ratio:4/3; }
.media--1x1{ aspect-ratio:1/1; }

.media-grid{
  display:grid;
  gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
}
.media-caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--silver);
}

/* --------------------------------------------------------- 头部 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-64px;
  z-index:120;
  padding:10px 16px;
  background:var(--cream);
  color:var(--cream-ink);
  font-size:14px;
  font-weight:600;
  border-radius:2px;
  transition:top 160ms ease-out;
}
.skip-link:focus{ top:12px; text-decoration:none; }

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(14,17,22,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px);
}

.header-tier{ position:relative; }

.header-tier--brand{
  background:var(--ink-2);
  border-bottom:1px solid var(--line-soft);
  overflow:hidden;
  max-height:140px;
  transition:max-height 300ms var(--ease),opacity 220ms ease-out,transform 300ms var(--ease);
}
.site-header.is-condensed .header-tier--brand{
  max-height:0;
  opacity:0;
  transform:translateY(-10px);
}

.tier-brand-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-block:10px;
  min-height:62px;
}

.brand-mark{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--cream);
  text-decoration:none;
}
.brand-mark:hover{ text-decoration:none; }
.brand-glyph{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:0 0 auto;
  background:var(--season-accent);
  color:var(--cream-ink);
  font-weight:900;
  font-size:18px;
  line-height:1;
}
.brand-text{ display:flex; flex-direction:column; }
.brand-name{
  font-size:16px;
  font-weight:900;
  letter-spacing:.06em;
  line-height:1.2;
}
.brand-claim{
  font-size:11px;
  letter-spacing:.1em;
  color:var(--silver);
  line-height:1.4;
}

.tier-actions{
  display:flex;
  align-items:center;
  gap:10px;
}

.theme-toggle{ white-space:nowrap; }
.theme-dot{
  width:9px;
  height:9px;
  flex:0 0 auto;
  background:var(--season-accent);
  border:1px solid rgba(242,234,217,.5);
}

.header-tier--nav{ background:rgba(14,17,22,.96); }

.tier-nav-inner{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:54px;
  padding-block:6px;
}

.site-nav{ flex:1 1 auto; min-width:0; }

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}

.nav-link{
  display:inline-block;
  padding:9px 13px;
  color:rgba(242,234,217,.82);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  border-bottom:2px solid transparent;
  border-radius:0;
  transition:color 180ms ease-out,border-color 180ms ease-out;
}
.nav-link:hover{
  color:var(--cream);
  text-decoration:none;
}
.nav-link[aria-current="page"]{
  color:var(--cream);
  border-bottom-color:var(--orange);
}

.nav-more{ position:relative; flex:0 0 auto; }
.nav-more-summary{
  display:inline-flex;
  align-items:center;
  padding:7px 12px;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--silver);
  cursor:pointer;
  list-style:none;
}
.nav-more-summary::-webkit-details-marker{ display:none; }
.nav-more-summary:hover{ color:var(--cream); border-color:var(--blue); }
.nav-more[open] .nav-more-summary{ color:var(--blue); border-color:var(--blue); }
.nav-more-panel{
  position:absolute;
  right:0;
  top:calc(100% + 6px);
  z-index:90;
  min-width:168px;
  display:flex;
  flex-direction:column;
  padding:6px;
  background:var(--ink-2);
  border:1px solid var(--line-strong);
}
.nav-more-panel a{
  padding:8px 10px;
  color:var(--cream);
  font-size:14px;
  text-decoration:none;
}
.nav-more-panel a:hover{
  background:rgba(45,155,240,.14);
  color:var(--blue);
  text-decoration:none;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  background:transparent;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--cream);
  cursor:pointer;
}
.nav-toggle:hover{ border-color:var(--blue); color:var(--blue); }
.nav-toggle-bars{
  position:relative;
  width:16px;
  height:1px;
  background:currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1px;
  background:currentColor;
}
.nav-toggle-bars::before{ top:-5px; }
.nav-toggle-bars::after{ top:5px; }

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
}
.scroll-progress-fill{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--spring-green),var(--orange),var(--amber),var(--ice));
  transition:width 120ms linear;
}

/* --------------------------------------------------------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-2);
  border-top:1px solid var(--line);
  color:var(--cream);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.4fr;
  gap:clamp(24px,3vw,40px);
  padding-block:clamp(40px,5vw,64px);
}

.footer-col{ display:flex; flex-direction:column; gap:12px; }

.footer-brand{
  margin:0;
  font-size:18px;
  font-weight:900;
  letter-spacing:.06em;
}
.footer-claim{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--season-accent);
}
.footer-note{
  margin:0;
  font-size:13px;
  line-height:1.7;
  color:rgba(242,234,217,.66);
  max-width:34ch;
}

.footer-title{
  margin:0 0 4px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--silver);
}

.footer-list{ display:flex; flex-direction:column; gap:8px; }
.footer-list a{
  color:var(--cream);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 180ms ease-out,border-color 180ms ease-out;
}
.footer-list a:hover{
  color:var(--blue);
  border-bottom-color:var(--blue);
  text-decoration:none;
}
.footer-list--contact li{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:rgba(242,234,217,.86);
}

.season-band{
  display:flex;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.season-seg{
  flex:1 1 0;
  display:flex;
  align-items:center;
  gap:8px;
  min-width:0;
  padding:12px 14px;
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(242,234,217,.62);
  border-right:1px solid var(--line-soft);
  opacity:.45;
  transition:opacity 260ms ease-out,flex-grow 260ms var(--ease),background-color 260ms ease-out;
}
.season-seg:last-child{ border-right:0; }
.season-seg b{
  font-family:var(--font-mono);
  font-weight:600;
  font-size:13px;
}
.season-seg[data-season-seg="spring"]{ border-top:3px solid var(--spring-green); }
.season-seg[data-season-seg="summer"]{ border-top:3px solid var(--orange); }
.season-seg[data-season-seg="autumn"]{ border-top:3px solid var(--amber); }
.season-seg[data-season-seg="winter"]{ border-top:3px solid var(--ice); }
.season-seg.is-current{
  flex-grow:2.2;
  opacity:1;
  color:var(--cream);
  background:rgba(255,255,255,.045);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-block:20px 28px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--silver);
}
.footer-copy,.footer-meta{ margin:0; }
.footer-meta{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.footer-meta a{ color:var(--silver); }
.footer-meta a:hover{ color:var(--blue); }

/* --------------------------------------------------------- 显现 ---------- */
[data-reveal]{
  transition:opacity 450ms ease-out var(--reveal-delay,0ms),transform 450ms ease-out var(--reveal-delay,0ms);
}
.has-js [data-reveal]:not(.is-visible){
  opacity:0;
  transform:translateY(10px);
}

/* --------------------------------------------------------- 工具 ---------- */
.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;
}

/* --------------------------------------------------------- 响应式 -------- */
@media (max-width:1024px){
  .bento--s{ grid-column:span 6; }
  .bento--m{ grid-column:span 6; }
  .bento--l{ grid-column:span 12; }
  .bento--xl{ grid-column:span 12; }
  .split--5-7,.split--4-8,.split--3-9{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
}

@media (max-width:860px){
  .tier-brand-inner{
    flex-wrap:wrap;
    justify-content:space-between;
    row-gap:8px;
  }
  .brand-claim{ display:none; }
  .tier-actions{ gap:8px; }
  .theme-toggle{ padding:9px 12px; }
  .theme-toggle [data-theme-label]{ display:none; }

  .tier-nav-inner{
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    padding-block:8px;
  }
  .nav-toggle{ display:inline-flex; order:1; }
  .nav-more{ order:2; margin-left:auto; }

  .site-nav{
    order:3;
    flex-basis:100%;
    display:none;
    border-top:1px solid var(--line-soft);
    padding-top:6px;
  }
  .site-nav[data-open]{ display:block; }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-list li + li{ border-top:1px solid var(--line-soft); }
  .nav-link{
    display:block;
    padding:13px 4px;
    border-bottom:0;
    border-left:2px solid transparent;
  }
  .nav-link[aria-current="page"]{
    border-left-color:var(--orange);
    padding-left:12px;
  }

  .season-band{ flex-direction:column; }
  .season-seg{ border-right:0; border-top:1px solid var(--line-soft); }
  .season-seg[data-season-seg="spring"]{ border-top:3px solid var(--spring-green); }
  .season-seg[data-season-seg="summer"]{ border-top:3px solid var(--orange); }
  .season-seg[data-season-seg="autumn"]{ border-top:3px solid var(--amber); }
  .season-seg[data-season-seg="winter"]{ border-top:3px solid var(--ice); }
  .season-seg.is-current{ background:rgba(255,255,255,.05); }
}

@media (max-width:640px){
  body{ font-size:15px; }
  .bento--s,.bento--m,.bento--l,.bento--xl{ grid-column:span 12; }
  .footer-grid{ grid-template-columns:1fr; }
  .btn--primary{ padding:9px 12px; }
  .footer-legal{ flex-direction:column; align-items:flex-start; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .btn:hover,.bento-card:hover{ transform:none; }
  .has-js [data-reveal]:not(.is-visible){ opacity:1; transform:none; }
  .scroll-progress-fill{ transition:none; }
}