/* =========================================================
   303利博主页 · 共享样式 /assets/site.css
   档案编号体系 · 深墨蓝底 · 电光青 + 暖金
   ========================================================= */

:root{
  --ink-900:#070B14;
  --ink-800:#0D1524;
  --ink-700:#162238;
  --line:#2A3446;
  --line-soft:rgba(91,102,122,.32);
  --cyan:#22D3EE;
  --cyan-soft:#8CE8F5;
  --gold:#E7B84B;
  --mist:#E8EDF5;
  --steel:#B6C2D4;
  --iron:#5B667A;

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

  --container:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius-s:6px;
  --radius-m:14px;
  --radius-l:28px;
  --header-h:76px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}

/* ---------- 基础排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--steel);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(circle at 10% -12%,rgba(34,211,238,.11),transparent 55%),
    radial-gradient(circle at 94% 6%,rgba(231,184,75,.07),transparent 52%),
    linear-gradient(180deg,#070B14 0%,#0A1120 58%,#070B14 100%);
  background-attachment:fixed;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  opacity:.55;
  background-image:
    repeating-linear-gradient(0deg,rgba(182,194,212,.035) 0 1px,transparent 1px 4px),
    repeating-linear-gradient(90deg,rgba(42,52,70,.28) 0 1px,transparent 1px 88px);
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.16;letter-spacing:-.02em;color:var(--mist)}
p{margin:0}
strong{color:var(--mist)}
::selection{background:rgba(34,211,238,.32);color:var(--mist)}

:focus-visible{outline:2px solid var(--cyan-soft);outline-offset:3px;border-radius:3px}
#main-content:focus{outline:none}

/* ---------- 容器与栅格 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.grid{display:grid;gap:clamp(16px,2.2vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 章节体系 ---------- */
.section{position:relative;padding-block:clamp(40px,6vw,88px)}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 20px;margin-bottom:clamp(20px,3vw,36px)}
.section__index{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.2em;
  color:var(--cyan);
  border:1px solid rgba(34,211,238,.38);
  border-radius:var(--radius-s);
  padding:4px 9px;
  transition:background .25s,color .25s,border-color .25s;
}
.section__title{font-size:clamp(26px,3.6vw,42px)}
.section__lede{flex-basis:100%;max-width:62ch;font-size:16px;color:var(--steel)}
[data-section].is-active .section__index{background:var(--cyan);border-color:var(--cyan);color:#04121A}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:46px;
  padding:0 22px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  transition:background .2s,color .2s,border-color .2s,transform .2s;
}
.btn--primary{background:var(--cyan);color:#04121A}
.btn--primary:hover{background:var(--cyan-soft);transform:translateY(-1px)}
.btn--ghost{border-color:rgba(34,211,238,.45);background:rgba(34,211,238,.07);color:var(--cyan-soft)}
.btn--ghost:hover{background:rgba(34,211,238,.16)}
.btn--gold{background:var(--gold);color:#1A1206}
.btn--gold:hover{background:#F2CB6E;transform:translateY(-1px)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-soft);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--steel);
}
.tag--cyan{border-color:rgba(34,211,238,.5);color:var(--cyan)}
.tag--gold{border-color:rgba(231,184,75,.5);color:var(--gold)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--iron);
}
.breadcrumbs__item{color:var(--steel)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs__sep{color:var(--iron)}

/* ---------- 正文容器 ---------- */
.prose{max-width:70ch;font-size:17px;line-height:1.75;color:var(--steel)}
.prose p + p{margin-top:1.05em}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin-block:1.6em .6em}
.prose h3{font-size:20px;margin-block:1.4em .5em}
.prose ul{margin-block:1em;display:grid;gap:.5em}
.prose li{position:relative;padding-left:20px}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--cyan)}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line-soft);
  border-radius:var(--radius-m);
  background:linear-gradient(160deg,rgba(22,34,56,.92),rgba(13,21,36,.92));
  transition:border-color .2s,transform .2s;
}
.card:hover{border-color:rgba(34,211,238,.45);transform:translateY(-2px)}
.card__index{display:block;margin-bottom:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--gold)}
.card__title{margin-bottom:8px;font-size:clamp(19px,2vw,23px);font-weight:800;line-height:1.3;color:var(--mist)}
.card__text{font-size:15.5px;color:var(--steel)}

/* ---------- 图像容器（供页面阶段放图） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line-soft);
  border-radius:var(--radius-m);
  background:linear-gradient(140deg,#162238 0%,#0D1524 60%,#070B14 100%);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(232,237,245,.035) 0 1px,transparent 1px 4px);
}
.media__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:14px 16px;
  background:linear-gradient(180deg,transparent,rgba(7,11,20,.92));
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--steel);
}

/* =========================================================
   页头
   ========================================================= */
.skip-link{
  position:fixed;
  left:var(--gutter);
  top:-120px;
  z-index:120;
  padding:10px 18px;
  border-radius:0 0 var(--radius-s) var(--radius-s);
  background:var(--cyan);
  color:#04121A;
  font-weight:700;
  transition:top .2s ease;
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(7,11,20,.9);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0 auto auto 0;
  width:min(320px,42%);
  height:2px;
  background:linear-gradient(90deg,var(--cyan),rgba(34,211,238,0));
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,32px);
  min-height:var(--header-h);
  padding-block:12px;
}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;min-height:44px}
.brand__mark{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--cyan);
  padding:6px 9px;
  border:1px solid rgba(34,211,238,.42);
  border-radius:var(--radius-s);
  background:rgba(34,211,238,.07);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:-.01em;color:var(--mist)}
.brand__tagline{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--steel)}

.header-ruler{
  flex:1 1 auto;
  height:1px;
  background-image:repeating-linear-gradient(90deg,rgba(91,102,122,.75) 0 1px,transparent 1px 12px);
}

.site-nav{display:flex;align-items:center;flex:0 1 auto}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:8px 12px;
  border-radius:8px;
  transition:background .2s,color .2s;
}
.site-nav__index{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--iron);transition:color .2s}
.site-nav__label{font-size:15px;font-weight:600;color:var(--steel);transition:color .2s}
.site-nav__link:hover{background:rgba(34,211,238,.08)}
.site-nav__link:hover .site-nav__label{color:var(--mist)}
.site-nav__link:hover .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]{background:rgba(34,211,238,.13)}
.site-nav__link[aria-current="page"] .site-nav__label{color:var(--mist)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:2px;
  background:var(--cyan);
}
.site-nav__hint{display:none}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:10px 14px;
  border:1px solid rgba(91,102,122,.5);
  border-radius:10px;
  background:rgba(22,34,56,.6);
  transition:border-color .2s,background .2s;
}
.nav-toggle:hover{border-color:rgba(34,211,238,.5);background:rgba(22,34,56,.85)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:20px}
.nav-toggle__bars span{display:block;height:2px;width:100%;background:var(--cyan);transition:transform .22s ease,opacity .22s ease}
.nav-toggle__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--steel)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3.5px) rotate(-45deg)}

.read-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
  background:rgba(91,102,122,.22);
}
.read-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-soft) 55%,var(--gold) 100%);
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(60px,9vw,140px);
  padding-block:clamp(44px,6vw,80px) 28px;
  background:linear-gradient(180deg,var(--ink-800) 0%,var(--ink-900) 100%);
  border-top:1px solid var(--line-soft);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:min(300px,44%);
  height:2px;
  background:linear-gradient(90deg,var(--cyan),rgba(34,211,238,0));
}
.footer-wordmark{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(64px,14vw,168px);
  line-height:.8;
  letter-spacing:-.04em;
  color:rgba(34,211,238,.09);
  -webkit-text-stroke:1px rgba(34,211,238,.3);
  margin-bottom:clamp(20px,3vw,38px);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,.85fr));
  gap:clamp(24px,3vw,48px);
}
.footer-brand__mark{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:20px;
  letter-spacing:-.01em;
  color:var(--mist);
  padding-bottom:10px;
}
.footer-brand__note{max-width:38ch;font-size:15px;color:var(--steel)}
.footer-brand__hours{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--steel);
}
.footer-brand__key{color:var(--cyan);margin-right:10px}

.footer-col__title{
  margin-bottom:14px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--cyan);
}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:15px;color:var(--steel);transition:color .2s}
.footer-links a::before{content:"/";margin-right:8px;color:var(--iron)}
.footer-links a:hover{color:var(--cyan-soft)}
.footer-links a:hover::before{color:var(--cyan)}

.footer-contact{display:grid;gap:14px}
.footer-contact li{display:flex;flex-direction:column;gap:2px}
.footer-contact__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--iron)}
.footer-contact__value{font-size:15px;color:var(--mist);word-break:break-word}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(28px,4vw,48px);
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
}
.footer-legal{color:var(--steel)}
.footer-meta{color:var(--iron)}

/* =========================================================
   滚动显现（仅在 JS 可用时启用隐藏态）
   ========================================================= */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s ease;
}
.has-js [data-reveal].is-revealed{opacity:1;transform:none}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1080px){
  .site-nav__link{padding:8px 9px}
  .site-nav__label{font-size:14px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:960px){
  :root{--header-h:64px}
  .site-header__inner{justify-content:space-between;flex-wrap:wrap;padding-block:10px}
  .header-ruler{display:none}
  .brand__tagline{display:none}
  .brand__name{font-size:17px}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    left:0;right:0;top:100%;
    display:block;
    padding:0 var(--gutter);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    background:linear-gradient(180deg,rgba(13,21,36,.99),rgba(7,11,20,.99));
    border-bottom:1px solid rgba(34,211,238,.25);
    transition:max-height .3s ease,visibility .3s ease;
  }
  .site-nav[data-open]{
    max-height:min(72vh,540px);
    overflow-y:auto;
    visibility:visible;
    padding-bottom:26px;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{display:block}
  .site-nav__link{
    flex-direction:row;
    align-items:baseline;
    gap:14px;
    padding:15px 8px;
    border-radius:0;
    border-bottom:1px solid rgba(91,102,122,.25);
  }
  .site-nav__link:hover{background:rgba(34,211,238,.06)}
  .site-nav__index{font-size:12px;color:var(--cyan)}
  .site-nav__label{font-size:18px;font-weight:700}
  .site-nav__link[aria-current="page"]{background:rgba(34,211,238,.1)}
  .site-nav__link[aria-current="page"]::after{
    left:auto;right:8px;bottom:20px;
    width:26px;
  }
  .site-nav__hint{
    display:block;
    margin-top:16px;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.1em;
    color:var(--iron);
  }
}

@media (max-width:640px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer-bottom{flex-direction:column}
  .section__head{gap:10px 14px}
  .btn{width:100%}
}

@media (max-width:420px){
  .brand__mark{font-size:11px;padding:5px 7px}
  .nav-toggle__label{display:none}
}

/* =========================================================
   可访问性与动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .site-nav{transition:none}
  .card:hover{transform:none}
  .btn:hover{transform:none}
}