/* ==========================================================================
   乐鱼看台 · 共享样式表  /assets/site.css
   深海蓝底 + 荧光青边线 + 等宽数字的看台档案语言
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:var(--cyan-400);text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-950:#05161F;
  --ink-900:#071B26;
  --ink-850:#0A2431;
  --teal-800:#0B2E3D;
  --indigo-700:#2A2B6B;
  --wine-700:#5C1B32;

  --cyan-400:#2FE3C8;
  --cyan-300:#6BF2DE;
  --lime-500:#A8E05F;
  --red-500:#FF5A6E;

  --mist-100:#E9F2F5;
  --mist-200:#CBDBE2;
  --slate-400:#8CA3AE;
  --paper-050:#F5F8F9;

  --line:rgba(233,242,245,.14);
  --line-soft:rgba(233,242,245,.08);
  --line-strong:rgba(47,227,200,.42);

  --shadow-1:0 1px 0 rgba(255,255,255,.03),0 18px 40px -30px rgba(0,0,0,.95);

  --font-display:'Oswald','Barlow Condensed','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --container-max:1240px;
  --gutter:clamp(18px,4vw,48px);
  --header-upper-h:34px;
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-950);
  background-image:
    linear-gradient(rgba(47,227,200,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(47,227,200,.05) 1px,transparent 1px);
  background-size:88px 88px,88px 88px;
  color:var(--mist-100);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.1;
  letter-spacing:.005em;
  color:var(--mist-100);
}
h1{font-size:clamp(38px,6vw,68px);letter-spacing:-.012em;font-weight:700}
h2{font-size:clamp(28px,3.6vw,40px);font-weight:700}
h3{font-size:clamp(20px,2vw,22px);font-weight:600;line-height:1.25}
h4{font-size:18px;font-weight:600}
p{overflow-wrap:break-word;word-break:break-word}
strong{font-weight:600;color:var(--mist-100)}
small{font-size:13px;color:var(--slate-400)}
#main-content{scroll-margin-top:112px}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--cyan-400);
  outline-offset:2px;
  border-radius:2px;
}

::selection{background:rgba(47,227,200,.28);color:var(--mist-100)}

/* ---------- 4. 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--container-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container-narrow{
  width:100%;
  max-width:880px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid{
  display:grid;
  gap:clamp(16px,2vw,28px);
  grid-template-columns:repeat(var(--cols,1),minmax(0,1fr));
}
.section{position:relative;padding-block:clamp(52px,7vw,96px)}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:12px 28px;
  padding-bottom:16px;
  margin-bottom:clamp(24px,3vw,36px);
  border-bottom:1px solid var(--line);
}
.section-title{font-size:clamp(28px,3.4vw,40px)}
.section-note{font-size:14px;color:var(--slate-400)}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan-400);
  margin-bottom:10px;
}
.lede{
  font-size:clamp(17px,1.5vw,20px);
  line-height:1.6;
  color:var(--mist-200);
  max-width:64ch;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.status-up{color:var(--lime-500)}
.status-down{color:var(--red-500)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  line-height:1;
  white-space:nowrap;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--cyan-400);border-color:var(--cyan-400);color:#04202A}
.btn-primary:hover{background:var(--cyan-300);border-color:var(--cyan-300);box-shadow:0 0 0 3px rgba(47,227,200,.16)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--mist-100)}
.btn-ghost:hover{color:var(--cyan-400);border-color:var(--line-strong);background:rgba(47,227,200,.07)}

/* ---------- 6. 跳转链接 / 滚动轨道 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:300;
  padding:10px 18px;
  background:var(--cyan-400);
  color:var(--ink-950);
  font-size:14px;
  font-weight:600;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .16s ease;
}
.skip-link:focus{transform:translateY(0);text-decoration:none}
.scroll-rail{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:150;
  background:rgba(233,242,245,.07);
  pointer-events:none;
}
.scroll-rail-fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan-400),var(--lime-500));
  transition:width .1s linear;
}

/* ---------- 7. 头部 ---------- */
.site-header{position:sticky;top:0;z-index:100}
.header-upper{
  background:linear-gradient(90deg,var(--teal-800) 0%,var(--ink-900) 52%,var(--indigo-700) 100%);
  border-bottom:1px solid rgba(47,227,200,.18);
}
.header-upper-inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:var(--header-upper-h);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  white-space:nowrap;
  overflow:hidden;
}
.header-upper-label{
  flex:0 0 auto;
  color:var(--cyan-400);
  letter-spacing:.22em;
  text-transform:uppercase;
}
.header-upper-list{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
  overflow:hidden;
}
.header-upper-list li{display:flex;align-items:center;color:var(--slate-400)}
.header-upper-list li+li::before{content:"·";margin:0 12px;color:rgba(47,227,200,.55)}
.header-upper-meta{
  flex:0 0 auto;
  color:var(--slate-400);
  letter-spacing:.18em;
  text-transform:uppercase;
}
.header-main{
  background:rgba(5,22,31,.9);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background-color .2s ease,box-shadow .2s ease;
}
.site-header[data-stuck] .header-main{
  background:rgba(5,22,31,.97);
  box-shadow:0 22px 44px -34px rgba(0,0,0,.95);
}
.header-main-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(16px,2.4vw,36px);
  min-height:78px;
}
.header-brand{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:3px;
  padding-left:14px;
}
.header-brand:hover{text-decoration:none}
.header-brand::before{
  content:"";
  position:absolute;
  left:0;
  top:2px;
  bottom:2px;
  width:3px;
  background:linear-gradient(180deg,var(--cyan-400),rgba(47,227,200,.15));
}
.brand-mark{
  font-family:var(--font-display);
  font-size:24px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--mist-100);
  transition:color .16s ease;
}
.header-brand:hover .brand-mark{color:var(--cyan-400)}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--slate-400);
}
.site-nav{display:block}
.nav-list{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:2px}
.nav-link{
  display:inline-block;
  padding:9px 12px;
  border-bottom:2px solid transparent;
  border-left:2px solid transparent;
  font-size:15px;
  color:var(--mist-200);
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.nav-link:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-400);text-decoration:none}
.nav-link[aria-current="page"]{
  color:var(--cyan-400);
  border-bottom-color:var(--cyan-400);
}
.header-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--mist-100);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  transition:border-color .16s ease,color .16s ease,background-color .16s ease;
}
.nav-toggle:hover{border-color:var(--line-strong);color:var(--cyan-400)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .18s ease,top .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;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{padding-top:22px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--slate-400);
}
.breadcrumb-item{display:flex;align-items:center;gap:8px}
.breadcrumb-item+.breadcrumb-item::before{content:"/";color:rgba(140,163,174,.6)}
.breadcrumb-link{color:var(--slate-400)}
.breadcrumb-link:hover{color:var(--cyan-400);text-decoration:none}
.breadcrumb-item[aria-current="page"]{color:var(--mist-100)}

/* ---------- 9. 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:var(--teal-800);
  box-shadow:var(--shadow-1);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.82) contrast(1.06) brightness(.94);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(5,22,31,0) 46%,rgba(5,22,31,.78) 100%);
  pointer-events:none;
}
.media-frame-caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  z-index:2;
  padding:14px 16px;
  font-size:13px;
  line-height:1.5;
  color:var(--mist-100);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,8vw,120px);
  background:
    linear-gradient(180deg,rgba(42,43,107,.42) 0%,rgba(5,22,31,0) 44%),
    var(--ink-900);
  border-top:1px solid var(--line-strong);
  color:var(--mist-100);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:min(320px,42%);
  height:2px;
  background:linear-gradient(90deg,var(--cyan-400),rgba(47,227,200,0));
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,2fr);
  gap:clamp(28px,4vw,64px);
  padding:clamp(44px,5vw,72px) 0 clamp(28px,3vw,40px);
}
.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-brand-mark{
  font-family:var(--font-display);
  font-size:26px;
  font-weight:700;
  letter-spacing:.03em;
  color:var(--mist-100);
}
.footer-brand-tagline{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--cyan-400);
}
.footer-note{
  margin-top:8px;
  max-width:40ch;
  font-size:14.5px;
  line-height:1.7;
  color:var(--slate-400);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.4vw,36px);
}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-col-title{
  padding-bottom:10px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--slate-400);
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-block;
  font-size:15px;
  color:var(--mist-200);
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer-link:hover{color:var(--cyan-400);border-bottom-color:var(--line-strong);text-decoration:none}
.footer-contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:18px 32px;
  padding:24px 0;
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.contact-item{display:flex;flex-direction:column;gap:5px}
.contact-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan-400);
}
.contact-value{font-size:15px;line-height:1.55;color:var(--mist-100);word-break:break-word}
.contact-note{
  grid-column:1/-1;
  max-width:78ch;
  font-size:13.5px;
  line-height:1.7;
  color:var(--slate-400);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding:20px 0 34px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--slate-400);
}
.footer-copyright{color:var(--mist-200)}
.footer-icp{color:var(--slate-400)}

/* ---------- 11. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:80;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid var(--cyan-400);
  border-radius:2px;
  background:var(--cyan-400);
  color:var(--ink-950);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease,background-color .16s ease;
}
.to-top:hover{background:var(--cyan-300)}
.to-top[data-visible]{opacity:1;visibility:visible;transform:translateY(0)}

/* ---------- 12. 渐入协议 ---------- */
html[data-js="ready"] [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .5s ease,transform .5s ease;
}
html[data-js="ready"] [data-reveal="shown"]{opacity:1;transform:none}

/* ---------- 13. 平板 ---------- */
@media (max-width:1080px){
  .header-main-inner{
    grid-template-columns:minmax(0,1fr) auto auto;
    gap:10px;
    min-height:66px;
  }
  .header-upper-meta{display:none}
  .header-upper-list li:nth-child(n+3){display:none}
  .header-actions{justify-content:flex-end}
  .header-actions .btn-ghost{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    padding:14px var(--gutter) 26px;
    max-height:calc(100vh - 96px);
    overflow-y:auto;
    background:linear-gradient(180deg,var(--ink-850),var(--ink-900));
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 30px 60px -40px rgba(0,0,0,.98);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    padding:15px 10px;
    font-size:16px;
    border-bottom:1px solid var(--line-soft);
    transition:color .16s ease,background-color .16s ease,border-color .16s ease,padding .16s ease;
  }
  .nav-link:hover{border-bottom-color:var(--line-soft)}
  .nav-link[aria-current="page"]{
    padding-left:16px;
    border-left-color:var(--cyan-400);
    border-bottom-color:var(--line-soft);
    background:linear-gradient(90deg,rgba(47,227,200,.14),rgba(47,227,200,0));
  }
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 14. 平板竖屏 ---------- */
@media (max-width:900px){
  body{font-size:16px}
  .grid{grid-template-columns:repeat(var(--cols-sm,1),minmax(0,1fr))}
}

/* ---------- 15. 手机 ---------- */
@media (max-width:600px){
  .header-upper-list{display:none}
  .brand-mark{font-size:21px}
  .brand-tagline{font-size:9.5px;letter-spacing:.18em}
  .header-actions .btn-primary{padding:9px 14px;font-size:14px}
  .footer-cols{grid-template-columns:minmax(0,1fr);gap:22px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-contact{grid-template-columns:minmax(0,1fr)}
  .to-top{right:14px;bottom:14px;padding:9px 13px}
}

/* ---------- 16. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html[data-js="ready"] [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}