/* ===== 合乐看台 /assets/site.css ===== */
/* 1. reset */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd,details,summary{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
summary{list-style:none}
summary::-webkit-details-marker{display:none}
:focus-visible{outline:2px solid #2BE0B0;outline-offset:3px;border-radius:6px}

/* 2. tokens */
:root{
  --ink:#0B211D;
  --panel:#12332C;
  --copper:#B8823F;
  --copper-bright:#E0A868;
  --orange:#FF7A33;
  --blue:#3AC7FF;
  --cyan:#2BE0B0;
  --paper:#F3EFE4;
  --muted:#7E9089;
  --near-black:#0A0D0C;
  --line:rgba(184,130,63,.42);
  --line-soft:rgba(126,144,137,.24);
  --rail:1280px;
  --gutter:clamp(16px,4vw,40px);
  --rail-w:300px;
  --footer-bar-h:42px;
  --cut:20px;
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-body:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Noto Sans Mono CJK SC","PingFang SC","Microsoft YaHei",monospace;
  --font-num:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;
}

/* 3. 台面底色：墨绿 + 铜色网格 + 角落辉光 */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 560px at 10% -8%, rgba(58,199,255,.10), transparent 62%),
    radial-gradient(880px 520px at 94% 6%, rgba(255,122,51,.09), transparent 64%),
    linear-gradient(rgba(184,130,63,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,130,63,.055) 1px, transparent 1px);
  background-size:auto,auto,64px 64px,64px 64px;
  background-attachment:fixed,fixed,scroll,scroll;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.005em;
  padding-bottom:calc(var(--footer-bar-h) + 10px);
  -webkit-font-smoothing:antialiased;
}

/* 4. 中文排版 */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.14;letter-spacing:-.02em;color:var(--paper)}
h1{font-size:clamp(30px,4.6vw,58px)}
h2{font-size:clamp(22px,2.6vw,36px)}
h3{font-size:clamp(18px,1.6vw,22px);font-weight:700}
p{max-width:68ch}
.num,.stat-value,.chapter-num,.data-table .num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* 5. 跳过链接 */
.skip-link{
  position:fixed;top:8px;left:50%;z-index:200;
  transform:translate(-50%,-160%);
  background:var(--orange);color:var(--near-black);
  font-family:var(--font-num);font-size:13px;font-weight:700;letter-spacing:.08em;
  padding:10px 18px;border-radius:999px;transition:transform .2s ease;
}
.skip-link:focus{transform:translate(-50%,0)}

/* 6. 头部：悬浮胶囊 */
.site-header{position:sticky;top:0;z-index:80;padding:14px var(--gutter) 10px}
.site-header::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,33,29,.95),rgba(11,33,29,.74) 58%,rgba(11,33,29,0));
}
.header-rail{
  position:relative;z-index:1;
  max-width:var(--rail);margin-inline:auto;
  display:flex;align-items:center;gap:12px;
}
.brand{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:10px;
  padding:7px 18px 7px 7px;
  background:rgba(18,51,44,.88);
  border:1px solid var(--line);border-radius:999px;
  transition:border-color .22s ease,background .22s ease;
}
.brand:hover{border-color:var(--copper-bright);background:rgba(18,51,44,1)}
.brand-mark{
  width:34px;height:34px;flex:0 0 34px;
  display:grid;place-items:center;
  background:var(--orange);color:var(--near-black);
  font-family:var(--font-display);font-weight:800;font-size:17px;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:17px;letter-spacing:.02em}
.brand-tag{font-family:var(--font-num);font-size:10.5px;letter-spacing:.12em;color:var(--muted);margin-top:2px}

.nav-toggle{
  display:none;align-items:center;gap:8px;margin-left:auto;
  padding:9px 16px;border:1px solid var(--copper);border-radius:999px;
  background:rgba(18,51,44,.9);color:var(--copper-bright);
  font-family:var(--font-num);font-size:12.5px;letter-spacing:.1em;
}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px}
.nav-toggle-bars i{display:block;width:16px;height:1.5px;background:currentColor}

.site-nav{
  flex:1 1 auto;min-width:0;
  display:flex;align-items:center;gap:8px;
  padding:5px 6px;
  background:rgba(18,51,44,.88);
  border:1px solid var(--line);border-radius:999px;
}
.nav-list{display:flex;align-items:center;gap:2px;min-width:0;overflow-x:auto;scrollbar-width:none}
.nav-list::-webkit-scrollbar{display:none}
.nav-list a{
  display:block;white-space:nowrap;
  padding:8px 14px;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-body);font-size:13.5px;letter-spacing:.02em;
  color:var(--paper);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.nav-list a:hover{color:var(--copper-bright);background:rgba(184,130,63,.16);border-color:var(--line)}
.nav-list a[aria-current="page"]{
  background:var(--orange);color:var(--near-black);
  font-weight:700;border-color:var(--orange);
}
.nav-actions{display:flex;align-items:center;gap:8px;margin-left:auto;padding-right:2px}

/* 7. 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-body);font-size:13.5px;letter-spacing:.05em;font-weight:600;
  white-space:nowrap;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn-primary{background:var(--orange);color:var(--near-black);font-weight:700}
.btn-primary:hover{background:#FF9356;transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:var(--copper);color:var(--copper-bright)}
.btn-ghost:hover{background:rgba(184,130,63,.18);color:var(--paper)}
.btn-link{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--blue);font-size:14px;
  border-bottom:1px solid rgba(58,199,255,.35);padding-bottom:2px;
  transition:color .2s ease,border-color .2s ease;
}
.btn-link:hover{color:var(--cyan);border-color:var(--cyan)}

/* 8. 布局 */
.wrap{width:100%;max-width:var(--rail);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(36px,6vw,84px)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;margin-bottom:clamp(18px,2.6vw,32px)}
.section-index{
  font-family:var(--font-num);font-size:12.5px;letter-spacing:.18em;
  color:var(--orange);border:1px solid rgba(255,122,51,.5);
  border-radius:999px;padding:4px 12px;
}
.section-title{font-size:clamp(20px,2.2vw,28px)}
.split-layout{display:grid;gap:clamp(20px,3vw,36px);grid-template-columns:minmax(0,1fr)}
.side-rail{display:grid;gap:16px;align-content:start}

/* 9. 面板与切角 */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.divider-slant{
  height:2px;margin-block:clamp(26px,4vw,52px);
  background:linear-gradient(90deg,transparent,var(--copper) 18%,var(--orange) 50%,var(--copper) 82%,transparent);
  transform:skewY(-1.2deg);
}

/* 10. 章节大编号板 */
.chapter-plate{display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(14px,3vw,32px);align-items:start}
.chapter-num{
  font-size:clamp(46px,9vw,104px);line-height:.82;font-weight:700;
  color:transparent;-webkit-text-stroke:1.5px var(--copper);
}
.chapter-title{font-size:clamp(20px,2.4vw,30px);margin-bottom:8px}
.chapter-sum{color:#D9D3C6;font-size:15px}

/* 11. 徽章与注释 */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-num);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  padding:4px 10px;border:1px solid var(--line);border-radius:999px;color:var(--copper-bright);
}
.tag--orange{color:var(--orange);border-color:rgba(255,122,51,.55)}
.tag--blue{color:var(--blue);border-color:rgba(58,199,255,.45)}
.note{font-size:13.5px;color:var(--muted);border-left:2px solid var(--copper);padding-left:12px}
.term{border-bottom:1px dashed var(--copper);cursor:help}

/* 12. 面包屑 */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-num);font-size:12.5px;letter-spacing:.08em;color:var(--muted);
  padding-block:16px 4px;
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--copper)}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--copper-bright)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

/* 13. 数据组件 */
.stat-row{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
.stat{display:flex;flex-direction:column;gap:4px}
.stat-value{font-size:clamp(26px,3.4vw,42px);line-height:1;color:var(--orange);font-weight:700}
.stat-label{font-family:var(--font-num);font-size:12px;letter-spacing:.12em;color:var(--muted)}
.stat--blue .stat-value{color:var(--blue)}
.stat--cyan .stat-value{color:var(--cyan)}

.data-strip{
  display:flex;flex-wrap:wrap;gap:1px;
  background:var(--line);border:1px solid var(--line);
}
.data-strip>*{flex:1 1 150px;background:var(--ink);padding:14px 16px;min-width:0}

.heat-strip{display:grid;grid-template-columns:repeat(24,minmax(0,1fr));gap:4px}
.heat-cell{
  height:44px;border-radius:3px;
  background-color:rgba(43,224,176,var(--heat,.16));
  border:1px solid var(--line-soft);
  transition:transform .18s ease,box-shadow .18s ease;
}
.heat-cell:hover{transform:scale(1.06) translateY(-2px);box-shadow:0 6px 14px rgba(10,13,12,.7)}

.timeline{position:relative;padding-left:30px}
.timeline::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--copper),rgba(184,130,63,.14))}
.timeline-item{position:relative;padding-bottom:26px}
.timeline-item::before{
  content:"";position:absolute;left:-29px;top:7px;width:12px;height:12px;
  border:2px solid var(--copper);background:var(--ink);transform:rotate(45deg);
  transition:background .22s ease,border-color .22s ease;
}
.timeline-item.is-in::before{border-color:var(--orange);background:var(--orange)}

/* 14. 表格与折叠 */
.table-wrap{overflow-x:auto;border:1px solid var(--line);background:var(--panel);-webkit-overflow-scrolling:touch}
.data-table{min-width:640px;font-size:14px}
.data-table caption{text-align:left;padding:14px 16px;color:var(--muted);font-size:13px}
.data-table th{
  position:sticky;top:0;z-index:2;
  background:#0F2A24;color:var(--copper-bright);
  font-family:var(--font-num);font-size:12.5px;font-weight:600;letter-spacing:.08em;
  text-align:left;padding:12px 14px;border-bottom:1px solid var(--copper);white-space:nowrap;
}
.data-table td{padding:12px 14px;border-bottom:1px solid var(--line-soft);vertical-align:top}
.data-table tbody tr:nth-child(even){background:rgba(10,13,12,.5)}
.data-table tbody tr:hover{background:rgba(58,199,255,.06)}
.data-table .num{color:var(--blue);font-size:15px}
.data-table .up{color:var(--cyan)}
.data-table .down{color:var(--orange)}

.fold{border:1px solid var(--line);background:var(--panel);margin-top:10px}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 18px;font-family:var(--font-display);font-weight:700;font-size:15px;
  cursor:pointer;transition:background .2s ease;
}
.fold summary:hover{background:rgba(184,130,63,.12)}
.fold summary::after{content:"+";font-family:var(--font-num);color:var(--orange);font-size:18px;line-height:1}
.fold[open] summary::after{content:"\2212"}
.fold-body{padding:0 18px 18px;color:#D9D3C6;font-size:15px}

/* 15. 章节索引 */
.chapter-nav{display:grid;gap:2px}
.chapter-nav a{
  display:flex;align-items:center;gap:10px;
  padding:8px 10px;border-left:2px solid var(--line-soft);
  font-size:13.5px;color:var(--muted);
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.chapter-nav a:hover{color:var(--paper);border-color:var(--copper);background:rgba(184,130,63,.1)}
.chapter-nav a.is-active{color:var(--orange);border-color:var(--orange);background:rgba(255,122,51,.1)}
.chapter-nav .chapter-nav-num{font-family:var(--font-num);font-size:12px;letter-spacing:.1em}

/* 16. 图片容器基础规则（页面阶段放置图片） */
.media-frame{
  position:relative;overflow:hidden;
  background-color:var(--panel);
  background-image:
    radial-gradient(120% 90% at 18% 12%, rgba(58,199,255,.16), transparent 60%),
    linear-gradient(135deg, rgba(184,130,63,.16) 0 1px, transparent 1px 100%);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,0 100%);
}
.media-frame img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,33,29,0) 42%,rgba(10,13,12,.8));
}
.media-frame--wide img{aspect-ratio:21/9}
.media-frame--square img{aspect-ratio:1/1}
.media-frame--portrait img{aspect-ratio:3/4}
.media-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

/* 17. 滚动进度与返回顶部（由 JS 创建） */
.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:120;
  background:linear-gradient(90deg,var(--orange),var(--copper-bright) 55%,var(--blue));
  box-shadow:0 0 12px rgba(255,122,51,.45);
}
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:calc(var(--footer-bar-h) + 18px);z-index:110;
  width:54px;height:54px;border-radius:50%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
  background:rgba(10,13,12,.92);border:1px solid var(--copper);color:var(--copper-bright);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s,border-color .2s ease,color .2s ease;
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--orange);color:var(--orange)}
.to-top-chapter{font-family:var(--font-num);font-size:11px;line-height:1;color:var(--orange)}
.to-top-arrow{font-size:14px;line-height:1}

/* 18. 显现动效 */
.js-reveal [data-reveal]{opacity:0;transform:translateX(12px);transition:opacity .26s ease,transform .26s ease}
.js-reveal [data-reveal].is-in{opacity:1;transform:none}

/* 19. 页脚 */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,110px);
  background:var(--near-black);
  border-top:1px solid var(--copper);
  color:var(--paper);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;height:3px;width:min(320px,42%);
  background:linear-gradient(90deg,var(--orange),var(--copper-bright) 62%,transparent);
}
.footer-inner{max-width:var(--rail);margin-inline:auto;padding:clamp(32px,5vw,64px) var(--gutter) 28px}
.footer-grid{display:grid;gap:clamp(22px,3vw,40px);grid-template-columns:1fr}
.footer-brand{display:flex;flex-direction:column;gap:10px}
.footer-logo{font-family:var(--font-display);font-weight:800;font-size:22px;letter-spacing:-.01em}
.footer-logo:hover{color:var(--copper-bright)}
.footer-tag{font-family:var(--font-num);font-size:12px;letter-spacing:.14em;color:var(--orange)}
.footer-note{font-size:14px;color:var(--muted);max-width:34ch}
.footer-col-title{
  font-family:var(--font-num);font-size:12px;font-weight:600;letter-spacing:.16em;
  color:var(--copper-bright);margin-bottom:12px;
}
.footer-links{display:grid;gap:8px}
.footer-links a{
  display:inline-flex;align-items:center;gap:8px;font-size:14px;color:#CFC9BC;
  transition:color .2s ease,transform .2s ease;
}
.footer-links a::before{content:"";width:10px;height:1px;background:var(--copper);transition:width .2s ease}
.footer-links a:hover{color:var(--orange)}
.footer-links a:hover::before{width:18px;background:var(--orange)}

.footer-contact{
  margin-top:clamp(28px,4vw,48px);padding-top:22px;
  border-top:1px solid var(--line-soft);
  display:grid;gap:14px 28px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}
.contact-item{display:flex;flex-direction:column;gap:3px}
.contact-key{font-family:var(--font-num);font-size:11.5px;letter-spacing:.14em;color:var(--copper-bright)}
.contact-value{font-size:14px;color:#CFC9BC;word-break:break-all}

.footer-bottom{
  margin-top:clamp(24px,3.4vw,40px);padding-top:18px;
  border-top:1px solid var(--line-soft);
  display:grid;gap:8px;
}
.footer-region{font-family:var(--font-num);font-size:12px;letter-spacing:.1em;color:var(--muted)}
.footer-notice{font-size:13px;color:var(--muted);max-width:56ch}
.footer-legal{font-family:var(--font-num);font-size:12px;letter-spacing:.08em;color:#9A9E93}

/* 20. 固定底栏 */
.footer-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:100;
  height:var(--footer-bar-h);
  background:rgba(10,13,12,.96);
  border-top:1px solid var(--line);
}
.footer-bar-inner{
  max-width:var(--rail);height:100%;margin-inline:auto;padding-inline:var(--gutter);
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-num);font-size:11.5px;letter-spacing:.06em;color:var(--muted);
  overflow-x:auto;white-space:nowrap;scrollbar-width:none;
}
.footer-bar-inner::-webkit-scrollbar{display:none}
.bar-sep{color:var(--copper)}
.footer-bar a{color:var(--copper-bright)}
.footer-bar a:hover{color:var(--orange)}

/* 21. 响应式 */
@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:6px;
    padding:10px;border-radius:22px;
    background:rgba(10,13,12,.98);border-color:var(--copper);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;overflow:visible}
  .nav-list a{padding:12px 14px;border-radius:14px;font-size:15px}
  .nav-actions{flex-direction:column;align-items:stretch;gap:8px;margin:8px 0 0;padding:0}
  .nav-actions .btn{width:100%}
}
@media (max-width:640px){
  :root{--footer-bar-h:38px;--cut:16px}
  .brand-tag{display:none}
  .brand{padding:6px 14px 6px 6px}
  .heat-strip{grid-template-columns:repeat(12,minmax(0,1fr));gap:3px}
  .to-top{width:48px;height:48px}
  .chapter-plate{grid-template-columns:1fr;gap:10px}
}
@media (min-width:781px){
  .footer-grid{grid-template-columns:1.5fr repeat(3,minmax(0,1fr))}
}
@media (min-width:1100px){
  .split-layout{grid-template-columns:var(--rail-w) minmax(0,1fr)}
  .side-rail{position:sticky;top:96px}
}

/* 22. 动效降级 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .heat-cell:hover{transform:none;box-shadow:none}
  .btn-primary:hover{transform:none}
}