/* =========================================================
   乐鱼看台 · site.css
   夜场看台气质：深蓝分层底 / 荧光青路径 / 珊瑚橙数据焦点
   ========================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
input,select,textarea{font:inherit}

/* ---------- 2. 变量 ---------- */
:root{
  --night:#05131F;
  --relay:#0A2438;
  --tier:#123A52;
  --line:#1E4C66;
  --line-soft:rgba(30,76,102,.55);
  --cyan:#2FF0CE;
  --mint:#8DF9E6;
  --coral:#FF6A45;
  --amber:#FFC24B;
  --ink:#E8F4F8;
  --ink-soft:rgba(232,244,248,.88);
  --mist:#93AEBE;

  --cyan-a08:rgba(47,240,206,.08);
  --cyan-a16:rgba(47,240,206,.16);
  --coral-a12:rgba(255,106,69,.12);
  --amber-a12:rgba(255,194,75,.12);

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

  --gutter:clamp(20px,5vw,56px);
  --maxw:1280px;
  --gap:clamp(16px,2vw,24px);
  --radius:3px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --section-pad:clamp(48px,7vw,104px);

  --grad-stand:linear-gradient(180deg,#0A2438 0%,#05131F 72%);
  --grad-panel:linear-gradient(158deg,rgba(18,58,82,.62) 0%,rgba(10,36,56,.86) 58%,rgba(5,19,31,.92) 100%);
  --grad-media:linear-gradient(152deg,#0A2438 0%,#123A52 52%,#05131F 100%);
  --grad-line:linear-gradient(90deg,var(--cyan),var(--mint));
}

/* ---------- 3. 页面底与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  color:var(--ink);
  background-color:var(--night);
  background-image:
    radial-gradient(120% 90% at 12% -8%,rgba(47,240,206,.10) 0%,rgba(47,240,206,0) 58%),
    radial-gradient(92% 72% at 100% 2%,rgba(18,58,82,.85) 0%,rgba(18,58,82,0) 62%),
    linear-gradient(180deg,#0A2438 0%,#05131F 44%,#05131F 100%);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
@media (max-width:640px){
  body{font-size:16px;line-height:1.8}
}
::selection{background:rgba(47,240,206,.26);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:1px}
#main-content{outline:none}
a{text-decoration-thickness:1px}

/* ---------- 4. 容器与骨架 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:760px}
.section{padding-block:var(--section-pad)}
.section-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2.5vw,34px);
  align-items:start;
  margin-bottom:clamp(22px,3vw,44px);
}
.chapter-index{
  font-family:var(--font-mono);
  font-size:clamp(30px,4.4vw,60px);
  font-weight:600;
  line-height:.86;
  letter-spacing:-.03em;
  color:rgba(30,76,102,.95);
  transition:color .3s var(--ease);
  display:inline-block;
  text-decoration:none;
}
.chapter-index[aria-current="true"],.chapter-index:hover{color:var(--cyan)}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(24px,3.4vw,42px);
  line-height:1.24;
  letter-spacing:.04em;
  margin:0;
  max-width:22ch;
}
.section-lede{
  margin-top:14px;
  color:var(--mist);
  max-width:36ch;
}
.split{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,4fr);
  gap:clamp(24px,4vw,72px);
  align-items:start;
}
.split__aside{padding-top:clamp(0px,3vw,60px)}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
.rule{height:1px;border:0;margin:0;background:var(--line)}
@media (max-width:900px){
  .split{grid-template-columns:1fr}
  .split__aside{padding-top:0}
  .col-4,.col-6,.col-7,.col-8{grid-column:span 12}
}

/* ---------- 5. 文本与数字 ---------- */
.lede{font-size:clamp(18px,2vw,21px);line-height:1.75;color:var(--ink);max-width:34em}
.prose{max-width:38em;color:var(--ink-soft)}
.prose p+p{margin-top:1.1em}
.prose strong{color:var(--ink);font-weight:700}
.prose a{color:var(--cyan);text-underline-offset:4px}
.prose ul,.prose ol{margin-top:.8em;padding-left:1.35em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.45em}
.prose h2,.prose h3{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:.03em;
  line-height:1.32;
}
.prose h2{font-size:clamp(20px,2.4vw,28px);margin-top:1.7em}
.prose h3{font-size:clamp(17px,1.8vw,20px);margin-top:1.4em}
.mono-index{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.figure{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:600;
  font-size:clamp(40px,7vw,88px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cyan);
  display:block;
}
.figure--coral{color:var(--coral)}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:#04141A}
.btn--primary:hover{background:var(--mint);border-color:var(--mint)}
.btn--ghost{background:rgba(18,58,82,.28);border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-a08)}
.btn--coral{background:var(--coral);border-color:var(--coral);color:#1B0A04}
.btn--coral:hover{background:#FF8867;border-color:#FF8867}

/* ---------- 7. 面板 / 条带 / 标签 / 图片容器 ---------- */
.panel{
  background:var(--grad-panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,32px);
}
.band{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  min-height:72px;
  padding:14px clamp(14px,2vw,24px);
  border-top:1px solid var(--line-soft);
  text-decoration:none;
  color:inherit;
  transition:background-color .2s var(--ease);
}
.band:last-child{border-bottom:1px solid var(--line-soft)}
.band:hover,.band:focus-visible{background:rgba(18,58,82,.58)}
.band__cell{min-width:0}
.band__go{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--mist);
  opacity:0;
  transform:translateX(-6px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),color .2s var(--ease);
}
.band:hover .band__go,.band:focus-visible .band__go{opacity:1;transform:none;color:var(--cyan)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(47,240,206,.5);background:var(--cyan-a08)}
.tag--coral{color:var(--coral);border-color:rgba(255,106,69,.5);background:var(--coral-a12)}
.tag--amber{color:var(--amber);border-color:rgba(255,194,75,.5);background:var(--amber-a12)}
.status-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(47,240,206,.14);
  flex:none;
  animation:stand-pulse 3.2s var(--ease) infinite;
}
@keyframes stand-pulse{0%,100%{opacity:1}50%{opacity:.42}}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--grad-media);
  isolation:isolate;
}
.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(80% 62% at 22% 0%,rgba(47,240,206,.16),transparent 62%),
    radial-gradient(70% 80% at 100% 110%,rgba(255,106,69,.12),transparent 60%);
  pointer-events:none;
  z-index:0;
}
.media-frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__caption{
  display:block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--mist);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs{
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--mist);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px}
.breadcrumbs li{display:flex;gap:8px;align-items:center}
.breadcrumbs li:not(:last-child)::after{content:"/";color:rgba(147,174,190,.5)}
.breadcrumbs a{color:var(--mist);text-decoration:none;transition:color .2s var(--ease)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

/* ---------- 9. 折叠内容组 ---------- */
.disclosure{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(10,36,56,.55);
  overflow:hidden;
}
.disclosure+.disclosure{margin-top:10px}
.disclosure__toggle{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  min-height:56px;
  padding:14px 18px;
  text-align:left;
  cursor:pointer;
  color:var(--ink);
  font-weight:600;
  letter-spacing:.02em;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.disclosure__toggle:hover{background:rgba(18,58,82,.5)}
.disclosure__toggle::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--cyan);
  flex:none;
  transition:transform .24s var(--ease);
}
.disclosure__toggle[aria-expanded="true"]::after{content:"–";transform:rotate(180deg)}
.disclosure__panel{
  max-height:0;
  overflow:hidden;
  opacity:0;
  transition:max-height .32s var(--ease),opacity .22s var(--ease);
}
.disclosure[data-open="true"] .disclosure__panel{opacity:1}
.disclosure__body{padding:0 18px 18px;color:var(--ink-soft);max-width:64ch}

/* ---------- 10. 刊头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(10,36,56,.98) 0%,rgba(6,22,36,.96) 100%);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transition:box-shadow .3s var(--ease);
}
.site-header[data-scrolled="true"]{box-shadow:0 16px 36px -26px rgba(0,0,0,.95)}
.header-inner{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.skip-link{
  position:absolute;
  left:12px;
  top:8px;
  z-index:120;
  transform:translateY(-160%);
  padding:10px 16px;
  border-radius:2px;
  background:var(--cyan);
  color:#04141A;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-decoration:none;
  transition:transform .18s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}
.masthead{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:18px;
  padding-block:20px;
  transition:padding-block .26s var(--ease);
}
.site-header[data-scrolled="true"] .masthead{padding-block:10px}
.masthead-status{
  display:flex;
  align-items:center;
  gap:9px;
  max-height:24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
  white-space:nowrap;
  transition:max-height .24s var(--ease),opacity .2s var(--ease);
}
.status-label{color:var(--mist)}
.status-code{color:var(--mint);letter-spacing:.14em}
.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  text-align:center;
  text-decoration:none;
  color:var(--ink);
}
.brand-mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(20px,2.2vw,29px);
  line-height:1.12;
  letter-spacing:.28em;
  padding-left:.28em;
  transition:color .2s var(--ease);
}
.brand:hover .brand-mark{color:var(--cyan)}
.brand-sub{
  max-height:20px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.22em;
  color:var(--mist);
  transition:max-height .24s var(--ease),opacity .2s var(--ease);
}
.site-header[data-scrolled="true"] .masthead-status,
.site-header[data-scrolled="true"] .brand-sub{
  max-height:0;
  opacity:0;
  overflow:hidden;
}
.masthead-actions{display:flex;align-items:center;justify-content:flex-end;gap:12px}
.masthead-cta{white-space:nowrap}
.nav-row{position:relative;border-top:1px solid var(--line-soft)}
.site-nav{display:block}
.site-nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  gap:clamp(2px,1.6vw,26px);
}
.nav-link{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:50px;
  padding:0 clamp(6px,1vw,12px);
  font-size:15px;
  letter-spacing:.06em;
  color:var(--mist);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-link:hover{color:var(--ink);background:rgba(18,58,82,.55)}
.nav-link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(30,76,102,.4);
  pointer-events:none;
}
.scroll-meter-bar{
  display:block;
  height:100%;
  width:0;
  background:var(--grad-line);
  transition:width .1s linear;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:44px;
  min-width:44px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,58,82,.6);
  color:var(--ink);
  cursor:pointer;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:18px}
.nav-toggle-bars i{
  display:block;
  height:2px;
  width:100%;
  background:var(--cyan);
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,9vw,120px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,36,56,0) 0%,rgba(10,36,56,.85) 32%,#071A29 100%);
}
.footer-inner{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(40px,6vw,84px) var(--gutter) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr .9fr 1.2fr 1fr;
  gap:clamp(24px,3vw,52px);
  align-items:start;
}
.footer-col{min-width:0}
.footer-col--brand{max-width:32ch}
.footer-col:nth-child(2){padding-top:clamp(0px,2.2vw,34px)}
.footer-col:nth-child(4){padding-top:clamp(0px,4vw,64px)}
.footer-brand{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(22px,2.6vw,30px);
  letter-spacing:.2em;
  line-height:1.2;
  color:var(--ink);
}
.footer-tagline{
  margin-top:14px;
  color:var(--ink-soft);
  max-width:24ch;
}
.footer-heading{
  display:flex;
  align-items:baseline;
  gap:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-heading-num{color:var(--cyan)}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-block;
  color:rgba(232,244,248,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:rgba(47,240,206,.5)}
.footer-contact{gap:8px}
.footer-line{
  color:rgba(232,244,248,.82);
  font-size:15px;
  line-height:1.7;
  word-break:break-word;
}
.footer-note{
  margin-top:12px;
  font-size:13px;
  line-height:1.75;
  color:var(--mist);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(32px,5vw,60px);
  padding-block:20px 28px;
  border-top:1px solid rgba(30,76,102,.6);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}
.footer-bottom .footer-note{margin-top:0;font-size:12px;letter-spacing:.1em}
.footer-icp{color:var(--mist)}
.footer-hours{color:rgba(147,174,190,.85)}

/* ---------- 12. 显现动效 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  will-change:opacity,transform;
}
.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,40px)}
  .footer-col:nth-child(2),.footer-col:nth-child(4){padding-top:0}
}
@media (max-width:900px){
  .masthead{grid-template-columns:1fr auto 1fr;gap:10px;padding-block:14px}
  .masthead-status{display:none}
  .masthead-cta{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height .3s var(--ease),opacity .22s var(--ease),visibility .3s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{
    max-height:min(68vh,560px);
    overflow:auto;
    opacity:1;
    visibility:visible;
  }
  .site-nav-list{flex-direction:column;align-items:stretch;gap:0;padding-block:6px 14px}
  .nav-link{
    justify-content:flex-start;
    min-height:54px;
    padding-inline:2px;
    font-size:16px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-link:hover{background:transparent;color:var(--cyan)}
  .nav-link[aria-current="page"]{border-bottom-color:var(--line-soft)}
  .nav-link[aria-current="page"]::after{
    content:"当前";
    margin-left:auto;
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.18em;
    color:var(--cyan);
  }
  .band{min-height:64px;padding:12px 4px}
  .band__go{opacity:1;transform:none}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .section-head{grid-template-columns:1fr;gap:8px}
  .chapter-index{font-size:34px}
}

/* ---------- 14. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
  .status-dot{animation:none}
  .js [data-reveal]{opacity:1;transform:none}
}