/* ============================================================
   四季体育 · 共享样式 /assets/site.css
   1 重置与变量 / 2 基础排版 / 3 布局 / 4 组件 / 5 图片容器
   6 页头 / 7 页脚 / 8 动效 / 9 响应式
   ============================================================ */

/* ---------- 1 重置与变量 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd,table,th,td{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{background:none;border:0;font:inherit;color:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
::selection{background:var(--accent);color:#0A1220}
.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}

:root{
  --ink:#0A1220;
  --panel:#121B2C;
  --panel-2:#0E1727;
  --glass:rgba(255,255,255,.10);
  --glass-2:rgba(255,255,255,.16);
  --spring:#2FC46F;
  --summer:#FF7A29;
  --autumn:#F0C33C;
  --winter:#4C8DFF;
  --accent:#C8FF3D;
  --text:#E9EEF7;
  --muted:#9BA8BE;
  --line:#22304A;
  --alert:#FF4D5E;
  --season:var(--winter);
  --sans:"Inter","Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --w:1360px;
  --pad:clamp(18px,3.4vw,40px);
  --hdr:64px;
  --r:10px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
html[data-season="spring"]{--season:var(--spring)}
html[data-season="summer"]{--season:var(--summer)}
html[data-season="autumn"]{--season:var(--autumn)}
html[data-season="winter"]{--season:var(--winter)}

/* ---------- 2 基础排版 ---------- */
body{
  font-family:var(--sans);
  font-size:clamp(16px,1.05vw,17.5px);
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(34,48,74,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,48,74,.42) 1px,transparent 1px);
  background-size:96px 96px;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:900;line-height:1.14;letter-spacing:-.02em}
h1{font-size:clamp(34px,5.6vw,72px)}
h2{font-size:clamp(24px,3.2vw,34px)}
h3{font-size:clamp(19px,1.9vw,24px)}
h4{font-size:clamp(16px,1.4vw,18px)}
strong{font-weight:800}
em{font-style:normal;color:var(--accent)}

.eyebrow{display:flex;align-items:center;gap:10px;font:600 12px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--season);transition:width .3s var(--ease),background .3s var(--ease)}
.lede{color:var(--muted);font-size:clamp(16px,1.35vw,18px);max-width:36em}
.caption{font:500 12.5px/1.6 var(--sans);letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
.num,.num-lg{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:-.01em}
.num-lg{font-size:clamp(34px,4.6vw,60px);line-height:1;font-weight:600}
.muted{color:var(--muted)}
.accent{color:var(--accent)}

/* ---------- 3 布局 ---------- */
.container{width:100%;max-width:var(--w);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.section{position:relative;padding:clamp(46px,6.6vw,96px) 0}
.section--tight{padding:clamp(28px,3.6vw,52px) 0}
.section--bleed{padding-left:0;padding-right:0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:22px;flex-wrap:wrap;margin-bottom:clamp(20px,3vw,36px)}

.grid{display:grid;gap:clamp(14px,1.6vw,22px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,1.4vw,20px)}
.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-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ---------- 4 组件 ---------- */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:clamp(16px,2vw,26px)}
.card--flat{background:var(--panel-2)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px}
.glass{background:var(--glass);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--glass-2);border-radius:var(--r);padding:clamp(16px,2vw,26px)}
.cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%)}
.cut-top{clip-path:polygon(0 22px,100% 0,100% 100%,0 100%)}
.rule{height:1px;background:var(--line);border:0;margin:clamp(22px,3vw,40px) 0}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 16px;border:1px solid var(--line);border-radius:8px;background:var(--glass);font-size:14px;font-weight:600;letter-spacing:.02em;white-space:nowrap;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease)}
.btn:hover{background:var(--glass-2);border-color:var(--accent);transform:translateY(-1px)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#0A1220;font-weight:700}
.btn-primary:hover{background:#D8FF6E;border-color:#D8FF6E;color:#0A1220}
.btn-ghost{background:transparent}
.btn-ghost:hover{border-color:var(--season);background:transparent}

.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border:1px solid var(--line);border-radius:999px;font:600 12px/1 var(--mono);letter-spacing:.06em;color:var(--muted);background:rgba(255,255,255,.04)}
.tag[data-season="spring"]{background:var(--spring);border-color:var(--spring);color:#06160D}
.tag[data-season="summer"]{background:var(--summer);border-color:var(--summer);color:#21100 4}
.tag[data-season="summer"]{background:var(--summer);border-color:var(--summer);color:#211004}
.tag[data-season="autumn"]{background:var(--autumn);border-color:var(--autumn);color:#1C1503}
.tag[data-season="winter"]{background:var(--winter);border-color:var(--winter);color:#050C1C}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{padding:7px 13px;border:1px solid var(--line);border-radius:999px;background:var(--glass);font:600 13px/1 var(--mono);letter-spacing:.04em;color:var(--muted);transition:border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease)}
.filter-btn:hover{color:var(--text);border-color:var(--glass-2)}
.filter-btn[aria-pressed="true"]{color:var(--text);border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent),0 0 0 3px rgba(200,255,61,.14)}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:var(--r);background:var(--panel)}
.data-table{min-width:560px;font-variant-numeric:tabular-nums}
.data-table th{position:sticky;top:0;background:var(--panel-2);font:600 12px/1.4 var(--mono);letter-spacing:.08em;color:var(--muted);text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.data-table td{padding:12px 14px;border-bottom:1px solid rgba(34,48,74,.66);font-size:15px;white-space:nowrap}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr:hover{background:var(--glass)}
.data-table .t-num{font-family:var(--mono);font-weight:600}

.breadcrumbs{display:flex;flex-wrap:wrap;gap:10px;padding:16px 0;font:600 12px/1 var(--mono);letter-spacing:.08em;color:var(--muted)}
.breadcrumbs li{display:flex;gap:10px;align-items:center}
.breadcrumbs li::after{content:"/";color:var(--line)}
.breadcrumbs li:last-child::after{content:""}
.breadcrumbs a:hover{color:var(--accent)}

.prose{max-width:46em}
.prose p{max-width:36em;margin-bottom:1.15em;color:#CBD5E6}
.prose p:last-child{margin-bottom:0}
.prose h2{margin:2.2em 0 .7em}
.prose h3{margin:1.8em 0 .6em}
.prose ul{max-width:36em;margin-bottom:1.15em}
.prose li{position:relative;padding-left:18px;color:#CBD5E6}
.prose li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:2px;background:var(--season)}
.quote{border-left:4px solid var(--autumn);padding:4px 0 4px 22px;font-size:clamp(19px,2.1vw,26px);font-weight:800;line-height:1.4;letter-spacing:-.01em;max-width:30em}

.stat{display:flex;flex-direction:column;gap:6px}
.stat-key{font:600 12px/1 var(--mono);letter-spacing:.08em;color:var(--muted)}
.stat-val{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:600;font-size:clamp(26px,3.2vw,40px);line-height:1;color:var(--text)}
.stat-val--accent{color:var(--accent)}

/* ---------- 5 图片容器（供页面阶段放置占位图） ---------- */
.media-frame{position:relative;display:block;overflow:hidden;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(140deg,var(--panel),var(--panel-2))}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame figcaption{position:absolute;left:0;right:0;bottom:0;padding:12px 16px;font:500 12.5px/1.55 var(--sans);letter-spacing:.04em;color:var(--text);background:linear-gradient(transparent,rgba(10,18,32,.88))}
.media-frame[data-ratio="21x9"]{aspect-ratio:21/9}
.media-frame[data-ratio="16x9"]{aspect-ratio:16/9}
.media-frame[data-ratio="3x2"]{aspect-ratio:3/2}
.media-frame[data-ratio="4x3"]{aspect-ratio:4/3}
.media-frame[data-ratio="1x1"]{aspect-ratio:1/1}
.media-frame[data-ratio="3x4"]{aspect-ratio:3/4}
.media-frame[data-tone="spring"]{background:linear-gradient(150deg,rgba(47,196,111,.30),var(--panel) 70%)}
.media-frame[data-tone="summer"]{background:linear-gradient(150deg,rgba(255,122,41,.30),var(--panel) 70%)}
.media-frame[data-tone="autumn"]{background:linear-gradient(150deg,rgba(240,195,60,.28),var(--panel) 70%)}
.media-frame[data-tone="winter"]{background:linear-gradient(150deg,rgba(76,141,255,.30),var(--panel) 70%)}
.media-frame[data-cut="left"]{clip-path:polygon(0 0,100% 0,100% 100%,5% 100%)}
.media-frame[data-cut="right"]{clip-path:polygon(0 0,100% 0,95% 100%,0 100%)}
.media-frame--tall{max-width:520px}

/* ---------- 6 页头 ---------- */
.skip-link{position:fixed;top:10px;left:10px;z-index:200;padding:10px 16px;border-radius:8px;background:var(--accent);color:#0A1220;font-weight:700;transform:translateY(-180%);transition:transform .2s var(--ease)}
.skip-link:focus{transform:none}

.cmd-bar{position:sticky;top:0;z-index:90;background:rgba(10,18,32,.88);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.cmd-inner{display:flex;align-items:center;gap:clamp(10px,1.4vw,22px);width:100%;max-width:var(--w);margin:0 auto;padding:0 var(--pad);height:var(--hdr);transition:height .25s var(--ease)}
.cmd-bar[data-stuck="true"] .cmd-inner{height:52px}

.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{display:grid;place-items:center;filter:drop-shadow(0 0 10px rgba(76,141,255,.28))}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-size:16px;font-weight:900;letter-spacing:.02em}
.brand-sub{font:600 10.5px/1.3 var(--mono);letter-spacing:.14em;color:var(--muted);transition:opacity .2s var(--ease)}
.cmd-bar[data-stuck="true"] .brand-sub{opacity:.55}

.nav-list{display:flex;align-items:center;gap:2px;counter-reset:navidx}
.nav-list li{counter-increment:navidx}
.nav-list a{position:relative;display:flex;align-items:baseline;gap:7px;padding:9px 9px 11px;font-size:13.5px;font-weight:600;color:var(--muted);white-space:nowrap;transition:color .2s var(--ease)}
.nav-list a::before{content:"0" counter(navidx);font:600 10.5px/1 var(--mono);letter-spacing:.06em;color:var(--line);transition:color .2s var(--ease)}
.nav-list a::after{content:"";position:absolute;left:9px;right:9px;bottom:5px;height:2px;background:var(--season);transform:scaleX(0);transform-origin:left;transition:transform .25s var(--ease)}
.nav-list a:hover{color:var(--text)}
.nav-list a:hover::before{color:var(--muted)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--text)}
.nav-list a[aria-current="page"]::before{color:var(--accent)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);box-shadow:0 0 12px var(--season)}

.cmd-search{display:flex;align-items:center;gap:9px;flex:1 1 160px;max-width:300px;margin-left:auto;padding:8px 12px;border:1px solid var(--glass-2);border-radius:8px;background:var(--glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);color:var(--muted);transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease)}
.cmd-search:hover{border-color:var(--accent);color:var(--text);background:var(--glass-2)}
.cmd-search-ico{flex:0 0 auto;color:var(--season)}
.cmd-search-text{flex:1 1 auto;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cmd-search-key{font:600 10.5px/1 var(--mono);letter-spacing:.1em;padding:4px 6px;border-radius:4px;border:1px solid var(--line);color:var(--muted)}

.cmd-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto;margin-left:auto}
.season-switch{display:flex;align-items:center;gap:6px;padding:5px 8px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.04)}
.season-dot{width:12px;height:12px;border-radius:50%;background:var(--dot,var(--winter));opacity:.45;transition:opacity .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease)}
.season-dot[data-season="spring"]{--dot:var(--spring)}
.season-dot[data-season="summer"]{--dot:var(--summer)}
.season-dot[data-season="autumn"]{--dot:var(--autumn)}
.season-dot[data-season="winter"]{--dot:var(--winter)}
.season-dot:hover{opacity:.85;transform:scale(1.12)}
.season-dot[aria-pressed="true"]{opacity:1;transform:scale(1.22);box-shadow:0 0 0 3px rgba(255,255,255,.10),0 0 14px var(--dot)}

.nav-toggle{display:none;align-items:center;gap:9px;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:var(--glass);font-size:13px;font-weight:600}
.nav-toggle-bars{position:relative;width:16px;height:2px;background:currentColor;transition:background .2s var(--ease)}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;transition:transform .25s 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)}

.cmd-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(34,48,74,.7);overflow:hidden}
.cmd-progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--spring),var(--summer),var(--autumn),var(--winter))}

/* ---------- 7 页脚 ---------- */
.site-footer{margin-top:clamp(48px,7vw,110px);border-top:1px solid var(--line);background:linear-gradient(180deg,var(--panel-2),#080F1C);padding:clamp(38px,5vw,64px) 0 28px}
.foot-grid{display:grid;grid-template-columns:1.7fr repeat(3,minmax(0,.85fr));gap:clamp(20px,3vw,44px)}
.foot-brand{display:flex;flex-direction:column;gap:10px;max-width:32em}
.foot-mark{filter:drop-shadow(0 0 12px rgba(47,196,111,.24))}
.foot-title{font-size:20px;font-weight:900;letter-spacing:.02em}
.foot-desc{color:var(--muted);font-size:14.5px;line-height:1.7;max-width:30em}
.foot-coord{font:600 11px/1.6 var(--mono);letter-spacing:.12em;color:var(--line)}
.foot-col-title{font:600 12px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.foot-links{counter-reset:fl}
.foot-links li{counter-increment:fl}
.foot-links a{display:flex;gap:10px;align-items:baseline;padding:7px 0;font-size:14.5px;color:var(--muted);transition:color .2s var(--ease),transform .2s var(--ease)}
.foot-links a::before{content:counter(fl,decimal-leading-zero);font:600 11px/1 var(--mono);letter-spacing:.04em;color:var(--season);opacity:.6}
.foot-links a:hover{color:var(--text);transform:translateX(3px)}
.foot-links a:hover::before{opacity:1;color:var(--accent)}

.foot-contact{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,2vw,26px);margin-top:clamp(20px,3vw,36px);padding-top:clamp(20px,3vw,32px);border-top:1px solid var(--line)}
.coord{display:flex;flex-direction:column;gap:6px;min-width:0}
.coord-key{font:600 11px/1 var(--mono);letter-spacing:.14em;color:var(--muted)}
.coord-val{font:600 13.5px/1.65 var(--mono);word-break:break-word;color:var(--text)}
.coord-note{grid-column:1/-1;font-size:13px;color:var(--muted);max-width:60em}

.foot-legal{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:clamp(24px,3vw,40px);padding-top:18px;border-top:1px solid var(--line);font:600 12px/1.7 var(--mono);letter-spacing:.06em;color:var(--muted)}
.foot-legal-note{color:var(--line);font-weight:500;max-width:52em}

/* ---------- 8 动效 ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}
[data-section][data-current="true"] .eyebrow::before{width:46px;background:var(--accent)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  [data-reveal]{opacity:1;transform:none}
}

/* ---------- 9 响应式 ---------- */
@media (max-width:1180px){
  .cmd-search{display:none}
}
@media (max-width:1024px){
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-7,.span-8,.span-9{grid-column:span 12}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--hdr:58px}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-brand{grid-column:1/-1}
  .foot-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
  .season-switch{display:none}
  .nav-toggle{display:inline-flex}

  .nav{position:fixed;top:var(--hdr);left:0;right:0;z-index:95;max-height:calc(100vh - var(--hdr));overflow-y:auto;
    background:rgba(10,18,32,.97);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);padding:12px var(--pad) 24px;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s}
  .nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{padding:15px 4px;font-size:15.5px;border-bottom:1px solid var(--line)}
  .nav-list a::after{left:0;right:auto;width:44px;bottom:0;height:2px}
  .nav-list a::before{font-size:11.5px}
}
@media (max-width:760px){
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
  .span-3,.span-4,.span-5,.span-6{grid-column:span 12}
  .section-head{flex-direction:column;align-items:flex-start}
  .data-table{min-width:520px}
}
@media (max-width:600px){
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .foot-contact{grid-template-columns:minmax(0,1fr)}
  .btn{padding:8px 13px;font-size:13px}
  .cmd-tools .btn-primary{display:none}
  .brand-sub{display:none}
}