/* ==========================================================================
   乐鱼赛场 — /assets/site.css
   共享外壳：重置、令牌、中文排版、页头、页脚、通用组件、响应式、可访问性
   ========================================================================== */

/* 1. 设计令牌 */
:root{
  --abyss:#061826;
  --console:#0B2C42;
  --steel:#12405C;
  --cyan:#35E6DA;
  --cyan-deep:#159A93;
  --coral:#FF6B4A;
  --signal:#FFC24B;
  --white:#EAF6FA;
  --mist:#8FA9B8;
  --frost:#F2F7FA;
  --cyan-veil:rgba(53,230,218,.12);
  --font-head:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gutter:clamp(18px,5vw,64px);
  --maxw:1240px;
  --radius-soft:26px;
  --radius-card:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* 2. 重置与基础 */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--abyss);
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video,picture{display:block;max-width:100%}
button{font:inherit;color:inherit}
ul,ol{list-style:none;margin:0;padding:0}
a{color:var(--cyan);text-decoration:none;transition:color .18s var(--ease)}
a:hover{color:#8FF3EC}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}
::selection{background:var(--cyan);color:var(--abyss)}
#main-content{display:block;padding-top:clamp(84px,8vw,104px);scroll-margin-top:88px}

/* 3. 中文排版 */
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:800;
  line-height:.98;
  letter-spacing:-.01em;
  margin:0 0 .55em;
  color:var(--white);
  text-wrap:balance;
}
h1{font-size:clamp(2.6rem,6.6vw,5.4rem)}
h2{font-size:clamp(1.9rem,4.2vw,3.2rem)}
h3{font-size:clamp(1.2rem,2.2vw,1.65rem);line-height:1.14;letter-spacing:0}
h4{font-size:1.02rem;line-height:1.35;letter-spacing:.02em}
p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
strong{color:#fff;font-weight:700}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.02em}

.label{
  display:inline-flex;align-items:center;gap:.55em;
  font-family:var(--font-mono);font-size:11px;line-height:1;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
}
.label::before{content:"";width:14px;height:1px;background:currentColor}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.28em .72em;border-radius:999px;
  border:1px solid var(--steel);background:rgba(11,44,66,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:#BFD6E1;white-space:nowrap;
}
.tag--cyan{border-color:rgba(53,230,218,.42);background:var(--cyan-veil);color:var(--cyan)}
.tag--coral{border-color:rgba(255,107,74,.45);background:rgba(255,107,74,.12);color:#FFB4A2}
.tag--signal{border-color:rgba(255,194,75,.45);background:rgba(255,194,75,.12);color:#FFD98F}

/* 4. 布局辅助 */
.shell{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:clamp(52px,7vw,110px)}
.section--tight{padding-block:clamp(30px,4vw,58px)}
.section--console{background:var(--console)}
.section--frost{background:var(--frost);color:#0A2334}
.section--frost h1,.section--frost h2,.section--frost h3,.section--frost h4{color:#061826}
.section--frost p{color:#2A4B5E}
.section--frost .label{color:#0F6E6A}
.section--frost a{color:#0C7A74}
.section--frost a:hover{color:#061826}
.grid{display:grid;gap:clamp(18px,2.6vw,34px)}
.grid--split{grid-template-columns:1fr}
.grid--thirds{grid-template-columns:1fr}
.prose{max-width:680px}
.prose p{color:#CBDEE8}
.section--frost .prose p{color:#2A4B5E}
.band{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 18px;
  padding-top:16px;border-top:1px solid var(--steel);
  margin-bottom:clamp(24px,3.4vw,44px);
}
.band__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--cyan)}
.band__title{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}
.section-head{display:grid;gap:16px;margin-bottom:clamp(26px,3.6vw,48px)}
.section-head__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--cyan)}
.section-head__sub{max-width:62ch;margin:0;color:var(--mist)}
.section--frost .section-head__sub{color:#3A5A6C}
.rule{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--steel),transparent)}
.watermark{
  position:absolute;z-index:0;pointer-events:none;user-select:none;
  font-family:var(--font-head);font-weight:800;line-height:.74;letter-spacing:-.03em;
  color:transparent;-webkit-text-stroke:1px rgba(53,230,218,.13);
}
@media (min-width:820px){
  .grid--split{grid-template-columns:5fr 7fr}
  .grid--thirds{grid-template-columns:repeat(3,1fr)}
}

/* 5. 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.82em 1.55em;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-body);font-size:14px;font-weight:600;letter-spacing:.02em;
  line-height:1.2;text-align:center;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),
             color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--coral);color:#0B1116;box-shadow:0 10px 26px -16px rgba(255,107,74,.95)}
.btn--primary:hover{background:#FF8A6E;color:#0B1116}
.btn--ghost{background:transparent;border-color:var(--steel);color:var(--white)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--quiet{background:var(--cyan-veil);border-color:rgba(53,230,218,.32);color:var(--cyan)}
.btn--quiet:hover{background:rgba(53,230,218,.22);color:var(--cyan)}
.btn--block{width:100%}

/* 6. 面包屑 */
.crumbs{
  display:flex;flex-wrap:wrap;gap:0 8px;list-style:none;
  padding-block:16px;font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.09em;color:var(--mist);
}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--steel)}
.crumbs a{color:var(--mist)}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:#BFD6E1}

/* 7. 跳至正文 */
.skip-link{
  position:fixed;top:-120px;left:clamp(12px,4vw,28px);z-index:300;
  padding:.75em 1.25em;border-radius:0 0 12px 12px;
  background:var(--cyan);color:var(--abyss);
  font-size:13px;font-weight:700;letter-spacing:.06em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0;color:var(--abyss)}

/* 8. 页头 */
.site-header{
  position:fixed;inset:0 0 auto;z-index:120;
  color:var(--white);
  background-color:transparent;
  transition:background-color .18s var(--ease),box-shadow .18s var(--ease),backdrop-filter .18s var(--ease);
}
.site-header::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,24,38,.95) 0%,rgba(6,24,38,.66) 58%,rgba(6,24,38,0) 100%);
  transition:opacity .18s var(--ease);
}
.site-header[data-scrolled]::before,
.site-header[data-open="true"]::before{opacity:0}
.site-header[data-scrolled]{
  background-color:rgba(11,44,66,.96);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  box-shadow:0 1px 0 var(--steel),0 18px 44px -34px #000;
}
.site-header[data-open="true"]{background-color:rgba(7,30,46,.99)}

.header-inner{
  position:relative;z-index:1;
  display:flex;align-items:center;gap:clamp(12px,2vw,30px);
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding:18px var(--gutter);
  transition:padding .18s var(--ease);
}
.site-header[data-scrolled] .header-inner{padding-block:9px}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--white)}
.brand:hover{color:var(--white)}
.brand-mark{
  width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;
  background:linear-gradient(150deg,var(--cyan),var(--cyan-deep));
  clip-path:polygon(0 0,100% 0,100% 66%,64% 100%,0 100%);
  transition:transform .3s var(--ease);
}
.brand-mark::after{content:"";width:11px;height:11px;background:var(--abyss);transform:rotate(45deg)}
.brand:hover .brand-mark{transform:rotate(-8deg)}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-name{font-family:var(--font-head);font-weight:800;font-size:20px;letter-spacing:.04em;color:var(--white)}
.brand-tag{margin-top:4px;font-size:10.5px;letter-spacing:.14em;color:var(--mist)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:7px 14px;border:1px solid var(--steel);border-radius:999px;
  background:transparent;color:var(--white);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
  cursor:pointer;transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;
  transition:transform .22s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.4vw,20px)}
.nav-link{
  position:relative;display:inline-block;
  padding:6px 2px;font-size:13.5px;font-weight:500;letter-spacing:.04em;
  color:#C6D9E4;white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-aside{
  display:flex;align-items:center;gap:12px;
  padding-left:16px;border-left:1px solid var(--steel);
}

.tz{position:relative}
.tz__btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;border:1px solid var(--steel);border-radius:999px;
  background:transparent;color:var(--mist);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  cursor:pointer;white-space:nowrap;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.tz__btn:hover,
.tz__btn[aria-expanded="true"]{border-color:rgba(53,230,218,.55);color:var(--cyan);background:var(--cyan-veil)}
.tz__dot{
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,230,218,.16);
}
.tz__time{font-variant-numeric:tabular-nums;color:var(--white)}
.tz__btn[aria-expanded="true"] .tz__time{color:var(--cyan)}
.tz__panel{
  position:absolute;top:calc(100% + 10px);right:0;z-index:8;width:236px;
  padding:14px;border:1px solid var(--steel);border-radius:16px;
  background:#0A2638;box-shadow:0 26px 50px -30px #000;
}
.tz__title{
  margin:0 0 10px;font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--mist);
}
.tz__list{display:grid;gap:4px;margin:0 0 10px}
.tz__opt{
  display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;
  padding:8px 10px;border:0;border-radius:10px;background:transparent;
  color:#C6D9E4;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;
  text-align:left;cursor:pointer;transition:background-color .16s var(--ease),color .16s var(--ease);
}
.tz__opt:hover{background:var(--cyan-veil);color:var(--cyan)}
.tz__opt[aria-pressed="true"]{background:var(--cyan-veil);color:var(--cyan)}
.tz__note{margin:0;font-size:10.5px;line-height:1.5;color:#6F8A9A}

.round-rail{
  position:relative;z-index:1;height:30px;overflow:hidden;
  border-top:1px solid rgba(18,64,92,.7);
  transition:height .18s var(--ease),opacity .18s var(--ease),border-color .18s var(--ease);
}
.site-header[data-scrolled] .round-rail{height:0;opacity:0;border-top-color:transparent}
.round-rail__track{
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  height:30px;max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--gutter);overflow-x:auto;scrollbar-width:none;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 5%,#000 95%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 5%,#000 95%,transparent);
}
.round-rail__track::-webkit-scrollbar{display:none}
.round-rail__tick{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  color:var(--mist);white-space:nowrap;
}
.round-rail__tick::before{content:"";width:1px;height:9px;background:var(--steel)}
.round-rail__tick.is-now{color:var(--cyan)}
.round-rail__tick.is-now::before{background:var(--cyan);box-shadow:0 0 8px var(--cyan)}

.header-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(53,230,218,.14);z-index:2}
.header-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan-deep),var(--cyan));
}

/* 9. 页脚 */
.site-footer{
  position:relative;overflow:hidden;
  padding-top:clamp(48px,6vw,84px);
  background:linear-gradient(180deg,#05141F 0%,var(--abyss) 46%);
  border-top:1px solid var(--steel);
  color:var(--white);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-deep) 32%,transparent 72%);
}
.footer-inner{
  position:relative;z-index:2;
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--gutter);
}
.footer-top{
  display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,48px);
  padding-bottom:clamp(30px,4vw,54px);
}
.footer-brand__mark{
  display:block;width:30px;height:30px;margin-bottom:14px;
  background:linear-gradient(150deg,var(--cyan),var(--cyan-deep));
  clip-path:polygon(0 0,100% 0,100% 66%,64% 100%,0 100%);
}
.footer-brand__name{
  margin:0 0 10px;font-family:var(--font-head);font-weight:800;
  font-size:clamp(1.6rem,3vw,2.2rem);line-height:1;letter-spacing:-.01em;color:var(--white);
}
.footer-brand__line{margin:0;max-width:36ch;font-size:13.5px;line-height:1.7;color:var(--mist)}
.footer-col__title{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
}
.footer-col ul{display:grid;gap:9px}
.footer-link{
  display:inline-block;font-size:14px;letter-spacing:.01em;color:#B9CEDB;
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--cyan);transform:translateX(2px)}
.footer-contact{
  display:flex;flex-wrap:wrap;gap:8px 26px;
  padding-block:22px;border-top:1px solid var(--steel);
  font-size:13px;line-height:1.7;color:var(--mist);
}
.footer-contact__item{display:inline-flex;align-items:center;gap:8px}
.footer-contact__item::before{
  content:"";width:4px;height:4px;border-radius:50%;
  background:var(--cyan-deep);flex:0 0 auto;
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px;
  padding-block:16px 26px;border-top:1px solid rgba(18,64,92,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:#6F8A9A;
}
.footer-legal__tag{color:var(--cyan-deep)}
.footer-watermark{
  position:absolute;right:-1.5vw;bottom:-2.4vw;z-index:1;
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(4.5rem,20vw,16rem);line-height:.72;letter-spacing:-.03em;
  color:transparent;-webkit-text-stroke:1px rgba(53,230,218,.10);
  pointer-events:none;user-select:none;
}
@media (min-width:860px){
  .footer-top{grid-template-columns:minmax(250px,1.4fr) repeat(3,minmax(130px,.7fr))}
}

/* 10. 响应式图片容器（页面阶段填入 <img>） */
.media{
  position:relative;display:block;overflow:hidden;margin:0;
  border-radius:var(--radius-soft);
  background:linear-gradient(150deg,#0E3350,#071E2E);
  isolation:isolate;
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.62) contrast(1.06) brightness(.88)}
.media::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(198deg,rgba(53,230,218,.18) 0%,rgba(53,230,218,0) 46%),
             linear-gradient(0deg,rgba(6,24,38,.78) 0%,rgba(6,24,38,0) 62%);
}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--band{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media__tag{
  position:absolute;left:16px;bottom:16px;z-index:2;
  display:inline-flex;align-items:center;gap:.5em;
  padding:.34em .82em;border-radius:999px;
  background:rgba(6,24,38,.78);border:1px solid rgba(53,230,218,.35);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--cyan);
  backdrop-filter:blur(6px);
}
.media__caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--mist)}
.section--frost .media{background:linear-gradient(150deg,#D9E7EF,#BFD5E2)}
.section--frost .media__caption{color:#3A5A6C}
@media (min-width:820px){
  .media--tall{aspect-ratio:4/5}
}

/* 11. 中等桌面收窄，避免导航溢出 */
@media (min-width:1041px) and (max-width:1210px){
  .brand-tag{display:none}
  .nav-link{font-size:12.5px}
  .nav-list{gap:11px}
  .nav-aside{gap:8px;padding-left:12px}
  .tz__btn{padding:5px 9px}
  .nav-cta{padding:.66em 1.05em;font-size:13px}
}

/* 12. 移动与平板导航 */
@media (max-width:1040px){
  .brand-tag{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;
    gap:18px;margin:0;padding:16px var(--gutter) 30px;
    background:#07202F;border-top:1px solid var(--steel);
    box-shadow:0 34px 60px -32px #000;
    max-height:calc(100vh - 70px);
    max-height:calc(100dvh - 70px);
    overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    padding:14px 0;font-size:16px;letter-spacing:.02em;
    border-bottom:1px solid rgba(18,64,92,.6);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--cyan);padding-left:14px}
  .nav-link[aria-current="page"]::before{
    content:"";position:absolute;left:0;top:50%;
    width:3px;height:16px;transform:translateY(-50%);background:var(--cyan);
  }
  .nav-aside{
    flex-direction:column;align-items:stretch;gap:12px;
    padding:18px 0 0;border-left:0;border-top:1px solid rgba(18,64,92,.6);
  }
  .nav-cta{width:100%}
  .tz{width:100%}
  .tz__btn{width:100%;justify-content:space-between;padding:10px 14px;font-size:12px}
  .tz__panel{left:0;right:0;width:100%}
}

@media (max-width:560px){
  body{font-size:16px}
  .brand-name{font-size:18px}
  .brand-mark{width:30px;height:30px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-watermark{right:-4vw;bottom:-1.5vw}
}

/* 13. 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;
    scroll-behavior:auto !important;
  }
  .btn:hover,.footer-link:hover,.brand:hover .brand-mark{transform:none}
}