/* ==========================================================================
   AK看台 · 共享站级样式 /assets/site.css
   01 变量与重置  02 中文排版  03 按钮/徽标/容器  04 面板与图片容器
   05 命令轨道头部  06 页脚  07 动效与无障碍  08 响应式
   ========================================================================== */

/* ---------- 01 变量与重置 ---------- */
:root{
  --ink:#061426;
  --ink-2:#0A1F33;
  --card:#102B45;
  --line:#25445F;
  --paper:#F4F8FB;
  --mist:#A9C2D4;
  --cyan:#35D6C4;
  --cyan-deep:#0F8F86;
  --cyan-neon:#7CF7E8;
  --amber:#FFC24B;
  --flame:#F2643D;
  --chalk:#E9EEF2;
  --slate:#1B3A4B;

  --rail:252px;
  --gutter:clamp(20px,4vw,46px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-display:"Space Grotesk","Noto Sans SC",system-ui,sans-serif;
  --font-editorial:"Noto Serif SC","Songti SC",serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-numeric:"IBM Plex Mono","SFMono-Regular",Consolas,monospace;
  --focus:var(--cyan-neon);
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
img,svg,picture,video{max-width:100%;height:auto;}
button,input,select,textarea{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
p{margin:0;}
h1,h2,h3,h4,h5,h6{margin:0;}
a{color:inherit;}

/* ---------- 02 中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.012em;
  color:var(--paper);
  background:var(--ink);
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.14;
  letter-spacing:-.01em;
  text-wrap:balance;
}
h1{font-size:clamp(36px,5vw,72px);}
h2{font-size:clamp(26px,3vw,42px);}
h3{font-size:clamp(20px,2vw,28px);}
p + p{margin-top:.85em;}
strong{font-weight:600;color:var(--paper);}
small{font-size:13px;line-height:1.6;color:var(--mist);}
.num{font-family:var(--font-numeric);font-variant-numeric:tabular-nums;letter-spacing:.02em;}

.eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-numeric);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";flex:none;inline-size:22px;block-size:1px;background:var(--cyan);}

.sr-only{
  position:absolute;
  inline-size:1px;block-size:1px;
  margin:-1px;padding:0;border:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;
}

/* ---------- 03 按钮 / 徽标 / 容器 / 网格 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:12px 20px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.05em;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:2px;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn--accent{background:var(--flame);border-color:var(--flame);color:#08131F;}
.btn--accent:hover{background:#FF7B52;border-color:#FF7B52;color:#08131F;}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:#04121F;}
.btn--cyan:hover{background:var(--cyan-neon);border-color:var(--cyan-neon);color:#04121F;}
.btn--ghost{background:rgba(16,43,69,.55);border-color:var(--line);color:var(--paper);}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  font-family:var(--font-numeric);
  font-size:11px;
  letter-spacing:.08em;
  border-radius:999px;
  color:var(--cyan);
  background:rgba(53,214,196,.1);
  border:1px solid rgba(53,214,196,.32);
}
.chip--amber{color:var(--amber);background:rgba(255,194,75,.1);border-color:rgba(255,194,75,.34);}
.chip--flame{color:#FFD9CE;background:rgba(242,100,61,.16);border-color:rgba(242,100,61,.45);}

.container{
  width:100%;
  max-width:1240px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid{display:grid;gap:clamp(16px,2vw,28px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-numeric);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.breadcrumb a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.breadcrumb__sep{color:var(--line);}

/* ---------- 04 面板与图片容器 ---------- */
.panel{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,30px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:linear-gradient(150deg,var(--slate),var(--ink-2));
  border:1px solid var(--line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%);
}
.media-frame > img,
.media-frame > picture > img{
  display:block;
  inline-size:100%;
  block-size:100%;
  object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16/9;}
.media-frame--4x3{aspect-ratio:4/3;}
.media-frame--21x9{aspect-ratio:21/9;}

/* ---------- 05 命令轨道头部 ---------- */
.skip-link{
  position:fixed;
  inset-block-start:10px;
  inset-inline-start:12px;
  z-index:200;
  padding:10px 16px;
  font-size:14px;
  font-weight:600;
  color:#04121F;
  background:var(--cyan);
  border-radius:2px;
  text-decoration:none;
  transform:translateY(-200%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

.site-header{
  position:fixed;
  inset-block-start:0;
  inset-inline-start:0;
  inline-size:var(--rail);
  block-size:100vh;
  block-size:100dvh;
  display:flex;
  flex-direction:column;
  padding:26px 22px 16px;
  background:linear-gradient(180deg,#0A1F33 0%,#071A2C 60%,#061426 100%);
  border-inline-end:1px solid var(--line);
  overflow:hidden auto;
  overscroll-behavior:contain;
  z-index:80;
  isolation:isolate;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:repeating-linear-gradient(122deg,rgba(53,214,196,.07) 0 1px,transparent 1px 22px);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 72%);
  mask-image:linear-gradient(180deg,#000 0%,transparent 72%);
}

.site-header__bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-block-end:18px;
  border-block-end:1px solid var(--line);
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:inherit;
}
.brand__mark{
  flex:none;
  inline-size:42px;
  block-size:42px;
  display:grid;
  place-items:center;
  font-family:var(--font-numeric);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  color:#04121F;
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 70%,74% 100%,0 100%);
}
.brand__text{display:block;min-width:0;}
.brand__name{
  display:block;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.05em;
  color:var(--paper);
}
.brand__sub{
  display:block;
  margin-block-start:3px;
  font-size:11px;
  line-height:1.4;
  letter-spacing:.09em;
  color:var(--mist);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  font-family:var(--font-body);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--paper);
  background:transparent;
  border:1px solid var(--line);
  border-radius:2px;
  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{display:flex;flex-direction:column;gap:3px;}
.nav-toggle__bars span{
  display:block;
  inline-size:16px;
  block-size:2px;
  background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}
.nav-toggle__label{white-space:nowrap;}

.site-nav{
  display:flex;
  flex-direction:column;
  flex:1 1 auto;
  min-height:0;
  margin-block-start:22px;
  overflow-y:auto;
  overscroll-behavior:contain;
}
.site-nav__hint{
  display:flex;
  align-items:flex-start;
  gap:9px;
  margin:0 0 20px;
  font-family:var(--font-numeric);
  font-size:10.5px;
  line-height:1.7;
  letter-spacing:.03em;
  color:var(--mist);
}
.status-dot{
  flex:none;
  inline-size:6px;
  block-size:6px;
  margin-block-start:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,214,196,.16);
}
.site-nav__list{display:flex;flex-direction:column;gap:2px;margin:0;padding:0;}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:11px;
  padding:10px 14px 10px 13px;
  font-size:14.5px;
  font-weight:500;
  line-height:1.5;
  letter-spacing:.02em;
  color:var(--mist);
  text-decoration:none;
  border-inline-start:2px solid transparent;
  transition:color .18s var(--ease),background-color .18s var(--ease),
             border-color .18s var(--ease);
}
.site-nav__index{
  flex:none;
  font-family:var(--font-numeric);
  font-size:10.5px;
  letter-spacing:.06em;
  color:var(--line);
  transition:color .18s var(--ease);
}
.site-nav__link:hover{color:var(--paper);background:rgba(53,214,196,.07);}
.site-nav__link:hover .site-nav__index{color:var(--mist);}
.site-nav__link[aria-current="page"]{
  color:var(--paper);
  border-inline-start-color:var(--cyan);
  background:linear-gradient(90deg,rgba(53,214,196,.16),rgba(53,214,196,0) 94%);
}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--cyan);}
.site-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  inset-inline-end:12px;
  inset-block-start:50%;
  inline-size:5px;
  block-size:5px;
  background:var(--amber);
  transform:translateY(-50%) rotate(45deg);
}
.site-nav__cta{margin-block-start:auto;width:100%;}

.scroll-meter{
  position:absolute;
  inset-inline:0;
  inset-block-end:0;
  block-size:2px;
  background:rgba(37,68,95,.65);
}
.scroll-meter__fill{
  display:block;
  inline-size:100%;
  block-size:100%;
  transform-origin:left center;
  transform:scaleX(var(--p,0));
  background:linear-gradient(90deg,var(--cyan-deep),var(--cyan) 62%,var(--cyan-neon));
}

/* ---------- 06 页脚 ---------- */
.site-footer{
  position:relative;
  margin-block-start:clamp(48px,7vw,104px);
  padding:clamp(30px,4vw,52px) var(--gutter) 0;
  background:var(--ink-2);
  border-block-start:1px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset-block-start:0;
  inset-inline:0;
  block-size:130px;
  pointer-events:none;
  background-image:repeating-linear-gradient(118deg,rgba(53,214,196,.08) 0 1px,transparent 1px 26px);
  -webkit-mask-image:linear-gradient(180deg,#000,transparent);
  mask-image:linear-gradient(180deg,#000,transparent);
}
.site-footer__inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:1240px;
  margin-inline:auto;
}
.site-footer__mast{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:22px;
  padding-block:clamp(10px,2vw,20px) clamp(24px,3vw,38px);
}
.site-footer__brand{display:grid;gap:10px;max-width:34ch;}
.site-footer__kicker{
  font-family:var(--font-numeric);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.site-footer__claim{
  font-family:var(--font-editorial);
  font-size:clamp(24px,3.2vw,40px);
  font-weight:600;
  line-height:1.32;
  letter-spacing:.01em;
  color:var(--paper);
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,2.1fr);
  gap:clamp(24px,4vw,56px);
  padding-block:30px 34px;
  border-block-start:1px solid var(--line);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.6vw,34px);
}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 0 14px;
  font-family:var(--font-numeric);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-col__title::before{content:"";flex:none;inline-size:14px;block-size:2px;background:var(--amber);}
.footer-col__list li + li{margin-block-start:9px;}
.footer-col__list a{
  font-size:14px;
  color:var(--paper);
  text-decoration:none;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-col__list a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

.footer-contact{
  display:grid;
  gap:5px;
  padding-block:22px;
  border-block-start:1px solid var(--line);
}
.footer-contact__label{
  font-family:var(--font-numeric);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
  margin-block-end:6px;
}
.footer-contact__row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  font-size:13.5px;
  color:var(--mist);
}
.footer-contact__row .num{font-size:13px;color:var(--paper);}
.footer-contact__note{font-size:12.5px;line-height:1.7;color:var(--mist);opacity:.82;}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 22px;
  padding-block:18px 26px;
  border-block-start:1px solid var(--line);
  font-family:var(--font-numeric);
  font-size:11.5px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer-legal__copy{margin:0;color:var(--paper);}
.footer-legal__icp{margin:0;color:var(--mist);opacity:.85;}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:16px;margin-inline-start:auto;}
.footer-legal__links a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid var(--line);
  padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-legal__links a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

/* ---------- 07 动效与无障碍 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
[data-reveal].is-visible{opacity:1;transform:none;}

:focus-visible{
  outline:2px solid var(--focus);
  outline-offset:3px;
  border-radius:2px;
}
a:focus-visible,
button:focus-visible{outline:2px solid var(--focus);outline-offset:3px;}

@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;
  }
  [data-reveal]{opacity:1 !important;transform:none !important;}
}

/* ---------- 08 响应式 ---------- */
@media (min-width:1000px){
  body{padding-inline-start:var(--rail);}
}

@media (max-width:999px){
  html{scroll-padding-top:86px;}

  .site-header{
    position:sticky;
    inset-block-start:0;
    inset-inline-start:auto;
    inline-size:100%;
    block-size:auto;
    flex-direction:column;
    padding:0;
    background:rgba(7,26,44,.96);
    border-inline-end:0;
    border-block-end:1px solid var(--line);
    -webkit-backdrop-filter:saturate(140%) blur(12px);
    backdrop-filter:saturate(140%) blur(12px);
    overflow:visible;
  }
  .site-header::before{block-size:100%;opacity:.7;}
  .site-header__bar{
    padding:12px var(--gutter);
    border-block-end:0;
  }
  .brand__mark{inline-size:38px;block-size:38px;font-size:14px;}
  .brand__name{font-size:17px;}
  .brand__sub{display:none;}
  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:absolute;
    inset-block-start:100%;
    inset-inline:0;
    margin:0;
    padding:16px var(--gutter) 24px;
    background:var(--ink-2);
    border-block-end:1px solid var(--line);
    box-shadow:0 26px 44px -30px rgba(0,0,0,.95);
    max-height:calc(100vh - 78px);
    max-height:calc(100dvh - 78px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .site-nav__hint{margin-block-end:14px;}
  .site-nav__list{gap:0;}
  .site-nav__link{
    padding-block:13px;
    font-size:15px;
    border-block-end:1px solid rgba(37,68,95,.55);
  }
  .site-nav__link[aria-current="page"]{background:linear-gradient(90deg,rgba(53,214,196,.14),transparent 88%);}
  .site-nav__cta{margin-block-start:18px;}

  .scroll-meter{inset-block-end:0;}

  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (max-width:719px){
  .grid--12{grid-template-columns:minmax(0,1fr);}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));}
  .site-footer__mast{align-items:flex-start;}
  .site-footer__mast .btn{width:100%;}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px;}
  .footer-legal__links{margin-inline-start:0;}
  .footer-contact__row{flex-direction:column;gap:2px;}
}

@media (max-width:479px){
  .nav-toggle__label{display:none;}
  .footer-nav{grid-template-columns:minmax(0,1fr);}
  .media-frame{clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);}
}

@media print{
  .site-header,.scroll-meter,.skip-link{display:none;}
  body{padding-inline-start:0;background:#fff;color:#061426;}
  .site-footer{background:#fff;border-block-start:1px solid #ccc;}
}