/* ============================================================
   多宝体育 · 共享样式表 /assets/site.css
   骨架：顶部书眉条 + 左侧装订索引栏，纵向长卷式阅读框架
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;color-scheme:light;scroll-padding-top:calc(var(--masthead-h) + 18px)}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0}
ul,ol{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}
:where(a,button,[tabindex]):focus-visible{outline:3px solid var(--ember-500);outline-offset:3px;border-radius:3px}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink-teal-900:#0B2E3B;
  --teal-700:#14505F;
  --teal-500:#1F7286;
  --teal-200:#A9CBD3;
  --cream-100:#F7F1E6;
  --paper-50:#FCFAF5;
  --ember-500:#E4632A;
  --ember-200:#F7CDB2;
  --cocoa-900:#241C16;
  --stone-500:#6E6862;
  --signal-green:#2E7D5B;
  --signal-red:#B23A2F;

  --bg:var(--cream-100);
  --bg-card:var(--paper-50);
  --bg-sunk:#EFE6D6;
  --text:var(--cocoa-900);
  --text-soft:var(--stone-500);
  --line:rgba(36,28,22,.14);
  --line-strong:rgba(36,28,22,.3);
  --chrome-bg:var(--paper-50);
  --chrome-text:var(--ink-teal-900);
  --accent:var(--ember-500);
  --on-accent:#FFF6EC;
  --on-deep:#F3EBDD;

  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC",SimSun,"Times New Roman",serif;
  --font-heading:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --content-max:1180px;
  --rail-w:88px;
  --masthead-h:64px;
  --radius-organic:16px 5px 16px 5px;
}

html[data-theme="dark"]{
  color-scheme:dark;
  --bg:#07222C;
  --bg-card:#0D3140;
  --bg-sunk:#051D26;
  --text:#F0E8DA;
  --text-soft:#A9CBD3;
  --line:rgba(169,203,211,.22);
  --line-strong:rgba(169,203,211,.4);
  --chrome-bg:#061B23;
  --chrome-text:#F0E8DA;
  --accent:#D2571F;
  --on-accent:#FFF3E9;
}

/* ---------- 3. 基础版式 ---------- */
body{
  min-height:100vh;
  padding-top:var(--masthead-h);
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  transition:background-color .2s ease,color .2s ease;
}
::selection{background:var(--ember-200);color:var(--cocoa-900)}
#main-content{display:block;scroll-margin-top:calc(var(--masthead-h) + 14px)}

h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700;line-height:1.3;color:var(--text)}
h2,.section-title{font-size:clamp(21px,2.4vw,28px);letter-spacing:.01em}
h3{font-size:clamp(17px,1.6vw,20px)}
p{max-width:36em}
.display{font-family:var(--font-display);font-weight:700;font-size:clamp(32px,5vw,52px);line-height:1.16;letter-spacing:-.005em}
.lede{font-size:clamp(16px,1.5vw,18px);line-height:1.8;color:var(--text-soft);max-width:34em}
.muted{color:var(--text-soft)}
.data-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.prose{max-width:34em}
.prose p + p{margin-top:1em}
.rule{display:block;height:1px;border:0;background:var(--line)}
.stack > * + *{margin-top:var(--stack-gap,1.1rem)}

.eyebrow{
  display:inline-flex;align-items:center;gap:.7em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--teal-500);line-height:1.4;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--ember-500)}
.chapter{display:flex;align-items:baseline;gap:14px;margin-bottom:18px}
.chapter__num{font-family:var(--font-mono);font-size:clamp(24px,3vw,36px);line-height:1;color:var(--ember-500);letter-spacing:.02em}
.chapter__label{font-family:var(--font-heading);font-weight:700;font-size:14px;letter-spacing:.2em;color:var(--text-soft)}

/* ---------- 4. 容器 / 网格 / 色带 ---------- */
.container{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:clamp(16px,4vw,44px)}
.section{padding-block:clamp(40px,6vw,84px)}
.section--tight{padding-block:clamp(26px,3.4vw,44px)}
.band-deep{background:var(--ink-teal-900);color:var(--on-deep)}
.band-teal{background:var(--teal-700);color:var(--on-deep)}
.band-paper{background:var(--bg-card)}
.band-deep :is(h1,h2,h3,h4,h5,h6),.band-teal :is(h1,h2,h3,h4,h5,h6){color:inherit}
.band-deep p,.band-teal p{color:rgba(243,235,221,.82)}
.grid{display:grid;gap:clamp(14px,2.2vw,26px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.split{display:grid;gap:clamp(18px,3vw,40px);grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .split--wide-left{grid-template-columns:1.35fr 1fr}
}

/* ---------- 5. 通用件 ---------- */
.card{
  position:relative;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius-organic);
  padding:clamp(16px,2.2vw,24px);
}
.card--accent{border-top:4px solid var(--teal-700)}
.card--ember{border-top:4px solid var(--ember-500)}
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:3px 10px;border:1px solid var(--line-strong);
  border-radius:999px 4px 999px 4px;
  font-family:var(--font-heading);font-size:12px;line-height:1.6;
  color:var(--text-soft);background:transparent;
}
.tag--ok{color:var(--signal-green);border-color:currentColor}
.tag--out{color:var(--signal-red);border-color:currentColor}
html[data-theme="dark"] .tag--ok{color:#6FBF97}
html[data-theme="dark"] .tag--out{color:#E0857B}

.media{
  position:relative;display:block;overflow:hidden;
  border-radius:18px 6px 18px 6px;
  background:linear-gradient(140deg,var(--teal-700),var(--teal-500) 55%,var(--ink-teal-900));
  aspect-ratio:16 / 10;
}
.media img,.media video{width:100%;height:100%;object-fit:cover}
.media--square{aspect-ratio:1 / 1}
.media--portrait{aspect-ratio:3 / 4}
.media--wide{aspect-ratio:21 / 9}
.media__caption,.figure__caption{
  margin-top:8px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.04em;color:var(--text-soft);
}

.breadcrumb{padding-block:16px;border-bottom:1px dashed var(--line)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-soft)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--teal-200)}
.breadcrumb a{color:var(--teal-700)}
.breadcrumb a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.breadcrumb [aria-current="page"]{color:var(--text);font-family:var(--font-heading);letter-spacing:.02em}
html[data-theme="dark"] .breadcrumb a{color:var(--teal-200)}

/* ---------- 6. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:10px 18px;border-radius:10px 4px 10px 4px;
  background:var(--accent);color:var(--on-accent);
  font-family:var(--font-heading);font-weight:700;font-size:14px;line-height:1.4;
  transform:translateY(-190%);
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 7. 书眉 ---------- */
.site-header{position:relative;z-index:80}
.masthead{
  position:fixed;top:0;left:0;right:0;
  height:var(--masthead-h);
  display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);
  padding-inline:clamp(12px,2.2vw,26px);
  background:var(--chrome-bg);
  color:var(--chrome-text);
  border-bottom:2px solid var(--ink-teal-900);
  box-shadow:0 1px 0 rgba(11,46,59,.06);
}
html[data-theme="dark"] .masthead{border-bottom-color:rgba(169,203,211,.24)}

.masthead__brand{display:flex;align-items:center;gap:10px;min-width:0;color:inherit}
.masthead__mark{
  position:relative;flex:0 0 auto;
  display:grid;place-items:center;width:36px;height:36px;
  background:var(--ink-teal-900);color:var(--cream-100);
  font-family:var(--font-display);font-weight:700;font-size:19px;line-height:1;
  border-radius:12px 4px 12px 4px;
}
.masthead__mark::after{content:"";position:absolute;top:5px;right:5px;width:5px;height:5px;border-radius:50%;background:var(--accent)}
html[data-theme="dark"] .masthead__mark{background:var(--teal-700);color:var(--cream-100)}
.masthead__wordmark{
  display:block;font-family:var(--font-display);font-weight:700;
  font-size:19px;line-height:1.1;letter-spacing:.08em;white-space:nowrap;
}
.masthead__tagline{
  display:block;margin-top:3px;
  font-family:var(--font-heading);font-weight:500;font-size:11px;line-height:1;
  letter-spacing:.22em;color:var(--text-soft);
}
html[data-theme="dark"] .masthead__tagline{color:var(--teal-200)}

.masthead__actions{margin-left:auto;display:flex;align-items:center;gap:clamp(6px,.9vw,12px)}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45em;
  padding:10px 16px;border:1.5px solid transparent;
  border-radius:10px 4px 10px 4px;
  font-family:var(--font-heading);font-weight:700;font-size:14px;line-height:1;
  letter-spacing:.02em;white-space:nowrap;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease;
}
.btn--sm{padding:8px 14px;font-size:13px}
.btn--ember{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.btn--ember:hover{background:var(--teal-700);border-color:var(--teal-700);color:var(--on-deep)}
.btn--ghost{background:transparent;color:var(--teal-700);border-color:var(--teal-200)}
.btn--ghost:hover{background:var(--teal-700);border-color:var(--teal-700);color:var(--paper-50)}
html[data-theme="dark"] .btn--ghost{color:var(--teal-200);border-color:rgba(169,203,211,.42)}
html[data-theme="dark"] .btn--ghost:hover{background:var(--teal-200);border-color:var(--teal-200);color:var(--ink-teal-900)}
.btn:active{transform:translateY(1px)}

/* ---------- 9. 深浅色与菜单按钮 ---------- */
.mode-toggle{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 12px;border:1.5px dashed var(--line-strong);
  border-radius:999px 6px 999px 6px;
  font-family:var(--font-heading);font-size:12.5px;font-weight:500;line-height:1;
  color:var(--text-soft);
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.mode-toggle::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--ink-teal-900);box-shadow:inset 0 0 0 3px var(--chrome-bg)}
.mode-toggle:hover{color:var(--text);border-color:var(--teal-500)}
html[data-theme="dark"] .mode-toggle::before{background:var(--accent)}
html[data-theme="dark"] .mode-toggle:hover{color:var(--cream-100);border-color:var(--teal-200)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 13px;border:1.5px solid var(--ink-teal-900);
  border-radius:10px 4px 10px 4px;
  font-family:var(--font-heading);font-weight:700;font-size:13px;line-height:1;
  color:var(--ink-teal-900);
}
html[data-theme="dark"] .nav-toggle{border-color:var(--teal-200);color:var(--teal-200)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;
  background:currentColor;transition:transform .2s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

.progress{position:absolute;left:0;right:0;bottom:-2px;height:3px;background:transparent;pointer-events:none}
.progress__bar{display:block;width:0;height:100%;background:var(--accent);border-radius:0 2px 2px 0}

/* ---------- 10. 装订索引栏（导航） ---------- */
.rail{
  position:fixed;top:var(--masthead-h);left:0;bottom:0;width:var(--rail-w);z-index:70;
  display:flex;flex-direction:column;align-items:center;
  padding:16px 0 18px;
  background:var(--ink-teal-900);color:var(--teal-200);
  border-right:1px solid rgba(0,0,0,.35);
  overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;
}
.rail__head{
  margin-bottom:14px;font-family:var(--font-mono);font-size:10px;
  letter-spacing:.34em;color:var(--teal-500);
  writing-mode:vertical-rl;text-orientation:upright;
}
.rail__list{display:flex;flex-direction:column;align-items:center;gap:6px;width:100%}
.rail__item{display:flex;justify-content:center;width:100%}
.rail__link{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:7px;
  width:64px;padding:9px 6px;border-radius:10px 4px 10px 4px;
  color:var(--teal-200);
  transition:color .16s ease,background-color .16s ease;
}
.rail__index{font-family:var(--font-mono);font-size:9.5px;line-height:1;letter-spacing:.06em;color:var(--teal-500);transition:color .16s ease}
.rail__label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--font-heading);font-weight:500;font-size:14px;line-height:1;letter-spacing:.16em;
}
.rail__link:hover{background:rgba(169,203,211,.12);color:var(--cream-100)}
.rail__link:hover .rail__index{color:var(--ember-200)}
.rail__link[aria-current="page"]{background:rgba(247,241,230,.12);color:#FFFFFF}
.rail__link[aria-current="page"] .rail__index{color:var(--ember-500)}
.rail__link[aria-current="page"]::after{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:22px;background:var(--ember-500);border-radius:0 2px 2px 0;
}
.rail :focus-visible{outline-color:var(--ember-200)}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,100px);
  background:var(--ink-teal-900);
  color:var(--on-deep);
  border-top:3px solid var(--ember-500);
}
.footer__band{display:flex;align-items:center;gap:16px;padding:14px clamp(18px,4vw,44px);background:var(--teal-700)}
.footer__band-line{flex:1;height:1px;background:rgba(247,241,230,.3)}
.footer__band-text{font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;color:var(--ember-200);white-space:nowrap}
.footer__inner{max-width:var(--content-max);margin-inline:auto;padding:clamp(32px,4.4vw,56px) clamp(18px,4vw,44px) 24px}
.footer__grid{display:grid;grid-template-columns:1.5fr repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.footer__mark{display:inline-block;font-family:var(--font-display);font-weight:700;font-size:26px;letter-spacing:.1em;color:var(--cream-100);line-height:1.2}
.footer__mark:hover{color:var(--ember-200)}
.footer__tagline{margin-top:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;color:var(--teal-200);line-height:1.6}
.footer__blurb{margin-top:14px;max-width:30em;font-size:14.5px;line-height:1.85;color:rgba(243,235,221,.76)}
.footer__brand .btn{margin-top:18px}
.footer__col-title{font-family:var(--font-heading);font-size:12.5px;font-weight:700;letter-spacing:.2em;color:var(--ember-200);line-height:1.6}
.footer__links{margin-top:14px;display:flex;flex-direction:column;gap:9px}
.footer__links a{
  font-size:14.5px;line-height:1.7;color:rgba(243,235,221,.8);
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .16s ease,border-color .16s ease;
}
.footer__links a:hover{color:var(--cream-100);border-bottom-color:var(--ember-500)}
.footer__contact{
  margin-top:clamp(26px,3.4vw,40px);padding-top:20px;
  border-top:1px solid rgba(247,241,230,.18);
  display:flex;flex-wrap:wrap;align-items:center;gap:clamp(14px,2.4vw,30px);
}
.footer__contact-item{display:flex;flex-direction:column;gap:3px;max-width:none}
.footer__contact-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;color:var(--teal-200);line-height:1.6}
.footer__contact-value{font-family:var(--font-heading);font-size:14px;line-height:1.7;color:var(--cream-100)}
.footer__contact .to-top{margin-left:auto}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 15px;border:1.5px solid rgba(247,241,230,.34);
  border-radius:10px 4px 10px 4px;
  font-family:var(--font-heading);font-size:12.5px;font-weight:500;line-height:1;
  color:var(--cream-100);
  transition:background-color .16s ease,border-color .16s ease,color .16s ease;
}
.to-top::before{content:"↑";font-family:var(--font-mono);font-size:13px;line-height:1}
.to-top:hover{background:var(--ember-500);border-color:var(--ember-500);color:#FFFFFF}
.footer__legal{
  margin-top:22px;padding-top:18px;
  border-top:1px solid rgba(247,241,230,.18);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
}
.footer__fineprint{font-size:12.5px;line-height:1.7;color:rgba(243,235,221,.62);max-width:60em}
.footer__icp{font-family:var(--font-mono);letter-spacing:.04em}
.footer__fineprint--note{margin-top:12px;max-width:66em}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:16px;margin-left:auto}
.footer__legal-links a{font-size:12.5px;color:rgba(243,235,221,.78);border-bottom:1px solid transparent}
.footer__legal-links a:hover{color:var(--cream-100);border-bottom-color:var(--ember-500)}
.site-footer :focus-visible{outline-color:var(--ember-200)}

/* ---------- 12. 滚动显现协议 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 13. 中等屏 ---------- */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .rail{
    display:block;top:var(--masthead-h);left:0;right:0;bottom:auto;width:auto;
    padding:14px clamp(14px,4vw,26px) 20px;
    border-right:0;border-bottom:2px solid rgba(169,203,211,.2);
    max-height:calc(100vh - var(--masthead-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s linear;
    box-shadow:0 24px 40px -24px rgba(0,0,0,.75);
  }
  .site-header[data-open] .rail{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .rail__head{display:none}
  .rail__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:auto}
  .rail__item{justify-content:flex-start}
  .rail__link{
    flex-direction:row;align-items:center;justify-content:flex-start;gap:10px;
    width:100%;padding:12px 14px;
    border:1px solid rgba(169,203,211,.24);
    border-radius:12px 4px 12px 4px;
    color:var(--cream-100);
  }
  .rail__label{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.06em}
  .rail__index{font-size:10.5px}
  .rail__link[aria-current="page"]{background:rgba(228,99,42,.18);border-color:rgba(228,99,42,.55)}
  .rail__link[aria-current="page"]::after{display:none}
  .footer__grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer__brand{grid-column:1 / -1}
}
@media (max-width:860px){
  .masthead__tagline{display:none}
  .masthead__actions .btn--ghost{display:none}
}
@media (max-width:600px){
  body{font-size:16px;line-height:1.72}
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__contact{flex-direction:column;align-items:flex-start;gap:12px}
  .footer__contact .to-top{margin-left:0}
  .footer__legal-links{margin-left:0}
}
@media (max-width:560px){
  .mode-toggle{display:none}
  .masthead__wordmark{font-size:17px}
  .masthead__mark{width:32px;height:32px;font-size:17px}
  .rail__list{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:400px){
  .nav-toggle__text{display:none}
  .btn{padding:9px 12px;font-size:13px}
}

/* ---------- 14. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .skip-link{transition:none}
}