/* ============================================================
   易倍体育 · /assets/site.css
   共享外壳：左侧品牌轨道 + 居中刊头 + 研究板页脚
   ============================================================ */

:root{
  --night:#081226;
  --ink:#0F1F3D;
  --sun:#FF8A2A;
  --gold:#FFC857;
  --grass:#2FBF71;
  --whistle:#E5484D;
  --paper:#F4EFE4;
  --mist:#8FA3BF;
  --cyan:#35D0BA;
  --ember:#7A3E12;
  --rail-w:88px;
  --shell-max:1240px;
  --gutter:clamp(16px,4vw,40px);
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --cond:"Arial Narrow","Roboto Condensed",var(--sans);
  --mono:"IBM Plex Mono","Roboto Mono","SFMono-Regular",Consolas,monospace;
  --line:rgba(143,163,191,.22);
  --line-soft:rgba(143,163,191,.14);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

body{
  font-family:var(--sans);
  font-size:clamp(15px,1.55vw,16.5px);
  line-height:1.72;
  color:#DCE4F1;
  background-color:var(--night);
  background-image:
    radial-gradient(1100px 520px at 92% -12%, rgba(255,138,42,.24), transparent 60%),
    radial-gradient(760px 460px at 2% 6%, rgba(53,208,186,.10), transparent 62%),
    radial-gradient(900px 700px at 50% 108%, rgba(122,62,18,.30), transparent 66%),
    linear-gradient(180deg,#081226 0%,#0B1730 44%,#081226 100%);
  min-height:100vh;
}

h1,h2,h3,h4{font-family:var(--cond);font-weight:800;line-height:1.2;letter-spacing:.03em;color:var(--paper)}
h1{font-size:clamp(30px,5vw,54px);text-transform:uppercase}
h2{font-size:clamp(23px,3.4vw,36px)}
h3{font-size:clamp(18px,2.2vw,22px)}
strong{color:var(--paper)}

.num,.stat__value,.data-table td.is-num,.footer-legal,[data-mono]{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-70px;z-index:300;
  padding:10px 18px;background:var(--gold);color:#1B0E02;
  font-weight:700;text-decoration:none;border-radius:2px;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ---------- 侧边品牌轨道 ---------- */
.brand-rail{display:none}

/* ---------- 刊头 ---------- */
.masthead{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg, rgba(8,18,38,.97), rgba(8,18,38,.86));
  -webkit-backdrop-filter:blur(14px) saturate(1.15);
  backdrop-filter:blur(14px) saturate(1.15);
  border-bottom:1px solid var(--line);
}
.masthead::after{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,var(--sun),var(--gold) 36%,rgba(255,138,42,0) 82%);
}
.masthead__utility{
  display:flex;align-items:center;justify-content:space-between;gap:12px 18px;flex-wrap:wrap;
  padding:8px var(--gutter);
  border-bottom:1px solid var(--line-soft);
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--mist);
}
.season-switch{display:flex;align-items:center;gap:6px}
.season-switch__label{color:rgba(143,163,191,.75)}
.season-chip{
  padding:4px 10px;border:1px solid rgba(143,163,191,.38);border-radius:2px;
  color:var(--mist);font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  cursor:pointer;transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.season-chip:hover{color:var(--gold);border-color:rgba(255,200,87,.6)}
.season-chip[aria-pressed="true"]{
  background:linear-gradient(120deg,var(--sun),var(--gold));
  color:#20100 2;color:#201002;border-color:transparent;font-weight:700;
}
.masthead__quick{display:flex;gap:18px}
.utility-link{text-decoration:none;color:var(--mist);border-bottom:1px solid transparent;transition:color .16s ease,border-color .16s ease}
.utility-link:hover{color:var(--gold);border-bottom-color:currentColor}

.masthead__center{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:clamp(10px,3vw,34px);
  padding:14px var(--gutter) 8px;
}
.masthead__rule{height:1px;background:linear-gradient(90deg,rgba(255,138,42,0),rgba(255,138,42,.55))}
.masthead__rule:last-child{background:linear-gradient(90deg,rgba(255,138,42,.55),rgba(255,138,42,0))}
.brand-lockup{display:flex;align-items:baseline;gap:14px;text-decoration:none;color:var(--paper);white-space:nowrap}
.brand-lockup__name{
  font-family:var(--cond);font-weight:800;font-size:clamp(22px,3.4vw,34px);
  letter-spacing:.16em;text-transform:uppercase;
  background:linear-gradient(100deg,var(--paper) 30%,var(--gold));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.brand-lockup__tag{font-family:var(--mono);font-size:11px;letter-spacing:.3em;color:var(--sun)}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin:0 auto 12px;
  padding:9px 18px;border:1px solid rgba(143,163,191,.38);border-radius:2px;
  background:rgba(15,31,61,.86);color:var(--paper);
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;cursor:pointer;
}
.nav-toggle__bars{position:relative;display:block;width:20px;height:2px;background:var(--sun);transition:background .18s ease}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--sun);transition:transform .18s ease,top .18s ease,background .18s ease;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;background:var(--gold);transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;background:var(--gold);transform:rotate(-45deg)}

.masthead__nav{padding:0 var(--gutter) 6px}
.nav-track{display:flex;flex-wrap:wrap;justify-content:center;gap:2px}
.nav-track__item{flex:0 0 auto}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:9px 15px;border:1px solid transparent;border-radius:2px;
  text-decoration:none;color:#C7D3E5;font-weight:700;font-size:14.5px;letter-spacing:.06em;
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.nav-link__index{font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--sun);opacity:.72}
.nav-link:hover{color:#fff;background:rgba(255,138,42,.12);border-color:rgba(255,138,42,.4)}
.nav-link[aria-current="page"]{
  background:linear-gradient(120deg,var(--sun),var(--gold));
  color:#201002;border-color:transparent;
}
.nav-link[aria-current="page"] .nav-link__index{color:#5B2A00;opacity:1}

.masthead__dateline{
  display:flex;align-items:center;justify-content:center;gap:9px;
  padding:2px var(--gutter) 11px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;color:rgba(143,163,191,.9);
}
.masthead__dateline::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--grass);
  box-shadow:0 0 0 3px rgba(47,191,113,.18);
}

/* ---------- 内容容器 ---------- */
#main-content{display:block;scroll-margin-top:130px}
.shell{width:min(100% - clamp(32px,7vw,88px), var(--shell-max));margin-inline:auto}
.shell--narrow{max-width:880px}
.section{padding:clamp(38px,6vw,74px) 0}
.section__head{display:flex;flex-direction:column;gap:10px;max-width:66ch;margin-bottom:clamp(18px,3vw,30px)}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--sun)}
.section-title{text-transform:uppercase;letter-spacing:.02em}
.lede{color:#BCCAE0;font-size:clamp(15px,1.7vw,17px)}
.prose{max-width:68ch;line-height:1.75}
.prose p+p{margin-top:1em}
.divider{height:1px;border:0;background:linear-gradient(90deg,var(--line),rgba(143,163,191,0));margin:clamp(20px,3vw,32px) 0}
.diag-rule{height:14px;border:0;background:repeating-linear-gradient(115deg,rgba(255,138,42,.5) 0 2px,rgba(255,138,42,0) 2px 10px)}

/* 横向主题带 */
.band{
  position:relative;padding:clamp(22px,3.4vw,36px) 0;
  border-block:1px solid var(--line);
  background:linear-gradient(100deg, rgba(255,138,42,.15), rgba(53,208,186,.08) 55%, rgba(8,18,38,0) 100%);
}
.band--night{background:linear-gradient(100deg, rgba(15,31,61,.95), rgba(8,18,38,.82))}
.band--grass{background:linear-gradient(100deg, rgba(47,191,113,.18), rgba(8,18,38,0) 88%)}

/* ---------- 网格 ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,22px)}
.grid--tight{gap:10px}
.col-3,.col-4,.col-6,.col-8,.col-12{grid-column:span 12}
@media (min-width:720px){
  .col-3{grid-column:span 6}
  .col-4{grid-column:span 6}
  .col-6{grid-column:span 6}
  .col-8{grid-column:span 12}
}
@media (min-width:1000px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-8{grid-column:span 8}
}
.tilt-1{transform:rotate(-1.1deg)}
.tilt-2{transform:rotate(.9deg)}
.tilt-3{transform:rotate(-2deg)}
@media (max-width:700px){
  .tilt-1,.tilt-2,.tilt-3{transform:none}
}

/* ---------- 卡片与研究板 ---------- */
.card{
  position:relative;padding:22px 22px 24px;border:1px solid var(--line);border-radius:3px;
  background:linear-gradient(160deg, rgba(15,31,61,.94), rgba(8,18,38,.9));
}
.card::before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:3px;background:linear-gradient(180deg,var(--sun),var(--gold))}
.card--flat::before{display:none}

.panel{border:1px solid var(--line);border-radius:3px;background:rgba(8,18,38,.62);overflow:hidden}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:13px 18px;background:rgba(15,31,61,.9);border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--mist);
}
.panel__body{padding:18px}

.note-card{position:relative;padding:20px;border:1px solid var(--line);border-radius:3px;background:rgba(15,31,61,.55)}
.note-card__kicker{font-family:var(--mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--sun)}
.note-card__title{margin-top:8px;font-size:19px}
.note-card__body{margin-top:10px;color:#C6D2E4;font-size:14.5px}
.note-card__meta{margin-top:14px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--mist)}
.note-card--edge{border-left:3px solid var(--whistle)}
.note-card--term{border-left:3px solid var(--cyan)}
.note-card--read{border-left:3px solid var(--grass)}

/* ---------- 指标与标签 ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-size:clamp(30px,5.4vw,58px);font-weight:700;line-height:1;letter-spacing:-.02em;color:var(--paper);
}
.stat__unit{font-size:.38em;letter-spacing:.12em;color:var(--mist);margin-left:6px}
.stat__label{font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}
.stat--sun .stat__value{color:var(--sun)}
.stat--gold .stat__value{color:var(--gold)}
.stat--grass .stat__value{color:var(--grass)}
.stat--whistle .stat__value{color:var(--whistle)}
.stat--cyan .stat__value{color:var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid currentColor;border-radius:2px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mist);background:rgba(143,163,191,.08);
}
.tag--sun{color:var(--sun)}
.tag--gold{color:var(--gold)}
.tag--grass{color:var(--grass)}
.tag--whistle{color:var(--whistle)}
.tag--cyan{color:var(--cyan)}

.stamp{
  display:inline-block;padding:3px 10px;border:1px dashed rgba(143,163,191,.5);border-radius:2px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--mist);
}
.stamp--green{color:var(--grass);border-color:rgba(47,191,113,.6)}
.stamp--gold{color:var(--gold);border-color:rgba(255,200,87,.55)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border:1px solid rgba(143,163,191,.4);border-radius:2px;
  text-decoration:none;color:var(--paper);font-family:var(--cond);font-weight:700;font-size:14.5px;letter-spacing:.1em;
  cursor:pointer;transition:transform .16s ease,background .16s ease,border-color .16s ease,color .16s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{
  background:linear-gradient(120deg,var(--sun),var(--gold));color:#201002;border-color:transparent;
  box-shadow:0 12px 26px -16px rgba(255,138,42,.95);
}
.btn--ghost{border-color:rgba(255,200,87,.55);color:var(--gold)}
.btn--ghost:hover{background:rgba(255,200,87,.1)}
.btn--quiet{border-color:transparent;color:var(--mist);padding-inline:0}
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:14px 0;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mist);
}
.breadcrumbs a{text-decoration:none;color:inherit}
.breadcrumbs a:hover{color:var(--gold)}
.breadcrumbs__sep{color:var(--sun)}
.breadcrumbs__item[aria-current="page"]{color:var(--paper)}

/* ---------- 表格 ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:3px;background:rgba(15,31,61,.5)}
.data-table{width:100%;min-width:560px;border-collapse:collapse;font-size:14.5px}
.data-table th,.data-table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line-soft)}
.data-table thead th{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);background:rgba(8,18,38,.72);
}
.data-table tbody tr:hover{background:rgba(255,138,42,.07)}
.data-table td.is-num{color:var(--gold)}

/* ---------- 图片容器 ---------- */
.figure{margin:0}
.figure__media{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:3px;
  background:linear-gradient(150deg,#0F1F3D,#081226);
  aspect-ratio:16 / 10;
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(8,18,38,0) 42%,rgba(8,18,38,.8));
}
.figure__tag{
  position:absolute;left:12px;top:12px;z-index:2;padding:4px 10px;
  background:rgba(8,18,38,.78);border:1px solid rgba(255,138,42,.5);color:var(--gold);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;
}
.figure__caption{margin-top:10px;font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;color:var(--mist)}
.figure--wide .figure__media{aspect-ratio:21 / 9}
.figure--tall .figure__media{aspect-ratio:4 / 5}
.figure--square .figure__media{aspect-ratio:1 / 1}

/* ---------- 显现 ---------- */
.reveal{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.22,.7,.3,1);
  transition-delay:calc(var(--i,0) * 70ms);
}
.reveal--in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(40px,7vw,92px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(8,18,38,.45), #050D1C 46%, #040A16);
}
.site-footer__edge{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--sun) 0 26px,rgba(143,163,191,.22) 26px 32px,var(--gold) 32px 58px,rgba(143,163,191,.22) 58px 64px,var(--grass) 64px 90px,rgba(143,163,191,.22) 90px 96px);
  opacity:.8;
}
.footer-shell{
  display:grid;grid-template-columns:1fr;gap:clamp(24px,4vw,44px);
  padding:clamp(30px,5vw,58px) 0 clamp(22px,4vw,40px);
}
.footer-brand__name{font-family:var(--cond);font-weight:800;font-size:22px;letter-spacing:.22em;color:var(--paper)}
.footer-brand__summary{margin-top:12px;max-width:34ch;color:var(--mist);font-size:14px}
.footer-stamps{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:20px}
.footer-col__title{
  margin-bottom:14px;font-family:var(--mono);font-size:11px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--sun);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;text-decoration:none;
  color:#C4D0E2;font-size:14.5px;transition:color .16s ease,transform .16s ease;
}
.footer-link::before{content:"";width:10px;height:1px;background:currentColor;opacity:.5}
.footer-link:hover{color:var(--gold);transform:translateX(3px)}
.footer-contact{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.footer-contact__row{display:flex;flex-direction:column;gap:3px}
.footer-contact__label{font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--mist)}
.footer-contact__value{color:var(--paper);font-size:14.5px;word-break:break-word;max-width:32ch}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px;
  padding:16px 0 30px;border-top:1px solid var(--line-soft);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--mist);
}
.footer-legal__line{color:var(--mist)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{text-decoration:none;color:var(--mist);transition:color .16s ease}
.footer-legal a:hover{color:var(--gold)}

/* ---------- 移动端刊头 ---------- */
@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}
@media (max-width:900px){
  .masthead__center{grid-template-columns:1fr;padding-bottom:12px}
  .masthead__rule{display:none}
  .brand-lockup{flex-direction:column;align-items:center;gap:4px;white-space:normal;text-align:center}
  .nav-toggle{display:inline-flex}
  .masthead__nav{display:none;padding-top:10px;border-top:1px solid var(--line-soft)}
  .masthead[data-open="true"] .masthead__nav{display:block;animation:navDrop .22s ease-out both}
  .nav-track{flex-wrap:nowrap;justify-content:flex-start;overflow-x:auto;padding-bottom:8px;scrollbar-width:thin}
  .nav-link{white-space:nowrap}
}
@media (max-width:520px){
  .masthead__utility{justify-content:center;font-size:10.5px;letter-spacing:.1em}
  .masthead__quick{justify-content:center;width:100%}
  .masthead__dateline{letter-spacing:.18em}
}

/* ---------- 平板与桌面 ---------- */
@media (min-width:720px){
  .footer-shell{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
  .footer-contact__value{max-width:52ch}
}
@media (min-width:1024px){
  .footer-shell{grid-template-columns:1.15fr 1.7fr 1fr;align-items:start}
  .footer-brand,.footer-contact{grid-column:auto}
}

/* ---------- 侧边轨道启用 ---------- */
@media (min-width:1200px){
  body{padding-left:var(--rail-w)}
  .brand-rail{
    display:flex;flex-direction:column;align-items:center;justify-content:space-between;
    position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);z-index:70;
    padding:22px 0 24px;
    background:linear-gradient(180deg,#0F1F3D,#081226 58%,#0F1F3D);
    border-right:1px solid var(--line);
  }
  .brand-rail::before{
    content:"";position:absolute;left:0;right:0;top:0;height:3px;
    background:linear-gradient(90deg,var(--sun),var(--grass));
  }
  .brand-rail__spine{
    writing-mode:vertical-rl;font-family:var(--cond);font-weight:800;
    font-size:13.5px;letter-spacing:.42em;color:rgba(244,239,228,.86);text-transform:uppercase;
  }
  .brand-rail__ticks{
    width:1px;height:92px;
    background:repeating-linear-gradient(180deg,rgba(255,138,42,.6) 0 1px,rgba(255,138,42,0) 1px 12px);
  }
  .rail-progress{position:relative;width:3px;height:30vh;border-radius:2px;overflow:hidden;background:rgba(143,163,191,.22)}
  .rail-progress__fill{
    position:absolute;left:0;right:0;top:0;height:0;
    background:linear-gradient(180deg,var(--gold),var(--sun) 55%,var(--whistle));
    transition:height .12s linear;
  }
  .rail-top{
    writing-mode:vertical-rl;padding:12px 7px;cursor:pointer;
    border:1px solid rgba(143,163,191,.38);border-radius:2px;
    font-family:var(--mono);font-size:10px;letter-spacing:.28em;color:var(--mist);
    transition:opacity .2s ease,color .16s ease,border-color .16s ease,background .16s ease;
  }
  .rail-top[data-visible="false"]{opacity:.4}
  .rail-top:hover{color:var(--gold);border-color:var(--gold);background:rgba(255,200,87,.08);opacity:1}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none;transition-delay:0s}
  .btn:hover,.footer-link:hover{transform:none}
  .rail-progress__fill{transition:none}
  .masthead[data-open="true"] .masthead__nav{animation:none}
}