/* ============================================================
   /assets/site.css — 乐博主站 共享外壳
   深墨蓝底 · 电光青/暖琥珀双强调 · 直角面板 · 精密网格
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:78px;
}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
h1,h2,h3,h4{font-weight:800;line-height:1.18;}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan-soft);
  outline-offset:2px;
  border-radius:1px;
}

/* ---------- tokens ---------- */
:root{
  --ink:#060F17;
  --panel:#0B1B26;
  --layer:#102834;
  --line:#1F4054;
  --cyan:#3EE0D4;
  --cyan-deep:#0E4B52;
  --cyan-soft:#9BF2EB;
  --amber:#F2A63B;
  --amber-dim:#8A5A16;
  --mist:#93A9B8;
  --paper:#E9F2F6;
  --invert:#E7EDF1;
  --invert-ink:#0A1A24;

  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:320px;
  --pad:24px;
  --maxw:1120px;
  --measure:34em;

  --fs-display:clamp(32px,4.6vw,58px);
  --fs-h2:clamp(23px,2.6vw,32px);
  --fs-h3:20px;
  --fs-body:17px;
  --fs-note:13px;

  --t-fast:180ms;
  --t-base:240ms;
}

@media (min-width:1024px){
  :root{--rail-w:320px;--pad:32px;}
}
@media (min-width:1024px) and (max-width:1199px){
  :root{--rail-w:284px;}
}

/* ---------- base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 62% at 82% -8%, rgba(62,224,212,.10), rgba(62,224,212,0) 62%),
    radial-gradient(90% 52% at 4% 0%, rgba(14,75,82,.40), rgba(14,75,82,0) 58%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
}
#main-content{display:block;scroll-margin-top:78px;}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.measure{max-width:var(--measure);}
.note{font-size:var(--fs-note);line-height:1.65;letter-spacing:.08em;color:var(--mist);}
.lede{font-size:var(--fs-body);line-height:1.75;color:var(--mist);max-width:var(--measure);}
.display-title{font-size:var(--fs-display);line-height:1.08;letter-spacing:-.01em;font-weight:800;}
.section-title{font-size:var(--fs-h2);line-height:1.2;letter-spacing:-.005em;font-weight:800;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--mist);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 16px;
  background:var(--cyan);color:#04211F;
  font-size:14px;font-weight:700;letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform var(--t-fast) ease;
}
.skip-link:focus{transform:none;}

/* ============================================================
   HEADER — 控制侧轨
   ============================================================ */
.site-rail{
  position:sticky;top:0;z-index:70;
  padding:12px 18px;
  background:rgba(11,27,38,.96);
  border-bottom:1px solid var(--line);
  color:var(--paper);
}
.rail__top{
  display:flex;align-items:center;justify-content:space-between;
  gap:14px;width:100%;min-width:0;
}
.rail__brand{display:flex;align-items:center;gap:12px;min-width:0;}
.rail__mark{
  position:relative;flex:none;
  display:grid;place-items:center;
  width:36px;height:36px;
  border:1px solid var(--cyan);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
}
.rail__mark::after{
  content:"";position:absolute;right:-1px;bottom:-1px;
  width:8px;height:8px;background:var(--amber);
}
.rail__brand-text{display:flex;flex-direction:column;min-width:0;}
.rail__wordmark{
  font-size:17px;font-weight:800;line-height:1.2;letter-spacing:.02em;
  color:var(--paper);white-space:nowrap;
}
.rail__tagline{
  margin-top:3px;
  font-size:12px;line-height:1.4;letter-spacing:.06em;color:var(--mist);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rail__toggle{
  display:inline-flex;align-items:center;gap:9px;flex:none;
  padding:8px 12px;
  border:1px solid var(--line);
  color:var(--mist);
  font-size:12px;letter-spacing:.14em;
  transition:border-color var(--t-fast) ease,color var(--t-fast) ease;
}
.rail__toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.rail__toggle-bars{display:grid;gap:3px;width:16px;}
.rail__toggle-bars span{display:block;height:1px;background:currentColor;}
.rail__toggle-bars span:nth-child(2){width:68%;}

/* 导航 / 抽屉 */
.rail__nav{
  position:fixed;top:0;left:0;bottom:0;z-index:90;
  width:min(88vw,344px);
  padding:20px 18px 28px;
  background:var(--panel);
  border-right:1px solid var(--line);
  overflow-y:auto;
  overscroll-behavior:contain;
  transform:translateX(-102%);
  visibility:hidden;
  transition:transform var(--t-base) ease,visibility 0s linear var(--t-base);
}
.site-rail[data-open] .rail__nav{
  transform:none;visibility:visible;
  transition:transform var(--t-base) ease,visibility 0s;
}
.rail__scrim{
  position:fixed;inset:0;z-index:85;
  background:rgba(6,15,23,.74);
  opacity:0;visibility:hidden;
  transition:opacity var(--t-base) ease,visibility 0s linear var(--t-base);
}
.site-rail[data-open] .rail__scrim{
  opacity:1;visibility:visible;
  transition:opacity var(--t-base) ease,visibility 0s;
}
.rail__nav-head{
  display:flex;align-items:center;gap:10px;
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.rail__nav-heading{font-size:12px;letter-spacing:.24em;color:var(--mist);}
.rail__nav-index{
  margin-left:auto;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:rgba(147,169,184,.65);
}
.rail__close{
  display:grid;place-items:center;
  width:30px;height:30px;flex:none;
  border:1px solid var(--line);
  color:var(--mist);font-size:16px;line-height:1;
  transition:border-color var(--t-fast) ease,color var(--t-fast) ease;
}
.rail__close:hover{border-color:var(--cyan);color:var(--cyan);}

/* 导航列表 */
.nav-list{display:grid;gap:2px;margin-bottom:22px;}
.nav-list__item{display:block;}
.nav-link{
  display:flex;align-items:center;gap:12px;
  padding:10px 12px;
  border-left:2px solid transparent;
  color:var(--mist);
  font-size:15px;letter-spacing:.02em;
  transition:color var(--t-fast) ease,background-color var(--t-fast) ease,border-color var(--t-fast) ease;
}
.nav-link__num{
  min-width:20px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(147,169,184,.55);
  transition:color var(--t-fast) ease;
}
.nav-link__label{white-space:nowrap;}
.nav-link:hover{
  color:var(--paper);
  background:var(--layer);
  border-left-color:var(--line);
}
.nav-link:hover .nav-link__num{color:var(--mist);}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(14,75,82,.34);
  border-left-color:var(--cyan);
}
.nav-link[aria-current="page"] .nav-link__num{color:var(--cyan);}
.nav-link[aria-current="page"]::after{
  content:"";margin-left:auto;flex:none;
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
}

/* 状态面板 */
.rail__status{padding-top:16px;border-top:1px solid var(--line);}
.rail__status-label{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-bottom:10px;
  font-size:12px;letter-spacing:.24em;color:var(--mist);
}
.rail__status-label .mono{font-size:10px;letter-spacing:.18em;color:rgba(147,169,184,.55);}
.chip-row{display:flex;flex-wrap:wrap;gap:6px;}

/* 芯片 */
.chip{
  display:inline-flex;align-items:center;
  padding:3px 8px;
  border:1px solid var(--line);
  background:rgba(16,40,52,.72);
  color:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  white-space:nowrap;
}
.chip--amber{
  color:var(--amber);
  border-color:var(--amber-dim);
  background:rgba(138,90,22,.20);
}
.chip--cyan{
  color:var(--cyan);
  border-color:var(--cyan-deep);
  background:rgba(14,75,82,.38);
}

/* 轨道 CTA */
.rail__cta{width:100%;justify-content:center;margin-top:20px;}

/* 进度刻度 */
.rail__meter{display:none;}
.rail__meter-label{
  display:block;margin-bottom:8px;
  font-size:11px;letter-spacing:.22em;color:var(--mist);
}
.rail__meter-track{display:block;position:relative;height:2px;background:var(--line);}
.rail__meter-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan-deep),var(--cyan));
  transition:width 120ms linear;
}

/* 纵向注记 */
.rail__spine{display:none;}

/* ---------- 桌面侧轨 ---------- */
@media (min-width:1024px){
  .site-rail{
    position:fixed;top:0;left:0;bottom:0;z-index:70;
    width:var(--rail-w);
    display:flex;flex-direction:column;align-items:stretch;
    padding:26px 22px 20px;
    background:var(--panel);
    border-bottom:0;border-right:1px solid var(--line);
    overflow:hidden;
  }
  .site-rail::before{
    content:"";position:absolute;left:0;top:0;
    width:1px;height:140px;
    background:linear-gradient(180deg,var(--cyan),rgba(62,224,212,0));
  }
  .site-rail::after{
    content:"";position:absolute;inset:0;
    background-image:repeating-linear-gradient(to right,rgba(31,64,84,.35) 0 1px,transparent 1px 68px);
    pointer-events:none;
  }
  .rail__top{position:relative;z-index:1;justify-content:flex-start;}
  .rail__toggle{display:none;}
  .rail__nav{
    position:static;z-index:1;
    width:auto;margin-top:26px;padding:0;
    background:transparent;border:0;
    transform:none;visibility:visible;overflow-y:auto;
    flex:1 1 auto;
    transition:none;
  }
  .rail__close{display:none;}
  .rail__scrim{display:none;}
  .rail__meter{
    position:relative;z-index:1;
    display:block;
    margin-top:16px;padding-top:14px;
    border-top:1px solid var(--line);
    flex:none;
  }
  .rail__spine{
    display:block;position:absolute;right:3px;top:50%;
    transform:translateY(-50%);
    writing-mode:vertical-rl;
    font-family:var(--font-mono);font-size:10px;letter-spacing:.32em;
    color:rgba(147,169,184,.45);
    pointer-events:none;
  }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-foot{
  position:relative;
  margin-top:64px;
  padding:46px 0 0;
  border-top:1px solid var(--line);
  background:
    linear-gradient(180deg,rgba(14,75,82,.26),rgba(14,75,82,0) 62%),
    var(--panel);
}
.site-foot::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,var(--cyan),rgba(62,224,212,0) 58%);
}
.foot__grid{
  display:grid;grid-template-columns:1fr;gap:32px 24px;
  width:100%;max-width:var(--maxw);margin:0 auto;
  padding:0 var(--pad);
}
@media (min-width:600px){
  .foot__grid{grid-template-columns:1fr 1fr;}
}
@media (min-width:1280px){
  .foot__grid{grid-template-columns:1.4fr 1fr 1.5fr .9fr;}
}
.foot__brand{min-width:0;}
.foot__wordmark{
  display:inline-block;
  font-size:20px;font-weight:800;letter-spacing:.04em;
  color:var(--paper);
  transition:color var(--t-fast) ease;
}
.foot__wordmark:hover{color:var(--cyan);}
.foot__intro{
  margin-top:10px;max-width:26em;
  font-size:14px;line-height:1.7;color:var(--mist);
}
.foot__badge{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:14px;padding:5px 9px;
  border:1px solid var(--amber-dim);
  background:rgba(138,90,22,.16);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--amber);
}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--cyan);}
.dot--amber{background:var(--amber);border-radius:1px;}
.foot__col{min-width:0;}
.foot__title{
  margin-bottom:12px;padding-bottom:8px;
  border-bottom:1px solid var(--line);
  font-size:12px;font-weight:400;letter-spacing:.24em;
  color:var(--mist);
}
.foot__list{display:grid;gap:8px;}
.foot__list li{font-size:14px;line-height:1.6;color:var(--mist);word-break:break-word;}
.foot__list--plain{gap:6px;}
.foot__link{
  color:var(--paper);
  border-bottom:1px solid transparent;
  transition:color var(--t-fast) ease,border-color var(--t-fast) ease;
}
.foot__link:hover{color:var(--cyan);border-bottom-color:var(--cyan-deep);}
.foot__list--plain .mono{font-size:13px;color:var(--mist);letter-spacing:.02em;}
.foot__bar{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 20px;
  width:100%;max-width:var(--maxw);margin:40px auto 0;
  padding:16px var(--pad) 24px;
  border-top:1px solid var(--line);
  font-size:12px;letter-spacing:.06em;color:var(--mist);
}
.foot__legal{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;}
.foot__note{max-width:40em;line-height:1.6;}
.foot__top{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;
  border:1px solid var(--line);
  font-size:12px;letter-spacing:.12em;color:var(--mist);
  transition:border-color var(--t-fast) ease,color var(--t-fast) ease;
}
.foot__top:hover{border-color:var(--cyan);color:var(--cyan);}

/* ============================================================
   通用组件（页面阶段复用）
   ============================================================ */
.container{
  width:100%;max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.section{padding:56px 0;border-top:1px solid var(--line);}
.section--flush{border-top:0;padding-top:36px;}
.panel{
  border:1px solid var(--line);
  background:var(--panel);
  padding:24px;
}
.grid{display:grid;gap:20px;}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
@media (max-width:900px){
  .grid--2,.grid--3{grid-template-columns:1fr;}
}
@media (min-width:1024px) and (max-width:1279px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;
  border:1px solid var(--line);
  border-radius:1px;
  background:var(--layer);
  color:var(--paper);
  font-size:15px;line-height:1.3;letter-spacing:.02em;
  transition:border-color var(--t-fast) ease,background-color var(--t-fast) ease,color var(--t-fast) ease;
}
.btn:hover{border-color:var(--cyan);background:#12303D;color:var(--cyan-soft);}
.btn--primary{
  background:var(--cyan);border-color:var(--cyan);
  color:#04211F;font-weight:700;
}
.btn--primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04211F;}
.btn--amber{
  border-color:var(--amber-dim);
  background:rgba(242,166,59,.08);
  color:var(--amber);
}
.btn--amber:hover{border-color:var(--amber);background:rgba(242,166,59,.14);color:#FFD08A;}
.btn--ghost{background:transparent;}
.btn--ghost:hover{background:var(--layer);}

/* 面包屑 */
.breadcrumb{
  padding:18px 0;
  font-size:13px;letter-spacing:.08em;color:var(--mist);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:0;}
.breadcrumb li{display:flex;align-items:center;}
.breadcrumb li + li::before{
  content:"/";margin:0 8px;
  color:var(--line);
}
.breadcrumb a{transition:color var(--t-fast) ease;}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

/* 提示块 */
.notice{
  border-left:2px solid var(--amber);
  background:rgba(242,166,59,.07);
  padding:14px 18px;
  font-size:15px;line-height:1.7;color:var(--paper);
}

/* 卡片 */
.card{
  display:block;position:relative;
  padding:20px;
  border:1px solid var(--line);
  background:var(--panel);
  transition:border-color var(--t-base) ease,background-color var(--t-base) ease,transform var(--t-base) ease;
}
.card:hover{border-color:var(--cyan);background:#0D2230;transform:translateY(-2px);}
.card__kicker{
  display:block;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--cyan);
}
.card__title{margin-top:8px;font-size:var(--fs-h3);line-height:1.35;font-weight:700;}
.card__text{margin-top:8px;font-size:15px;line-height:1.7;color:var(--mist);}
.card__meta{
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
  margin-top:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--mist);
}

/* 图片容器（页面阶段放置实际图片/示意图） */
.figure{
  position:relative;
  border:1px solid var(--line);
  background:linear-gradient(158deg,var(--layer),var(--panel) 62%,#0A1620);
  overflow:hidden;
}
.figure__frame{position:relative;aspect-ratio:16/10;overflow:hidden;}
.figure__img{
  width:100%;height:100%;
  object-fit:cover;object-position:center;
  display:block;
}
.figure__cap{
  display:flex;justify-content:space-between;gap:12px;
  padding:10px 14px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.figure--wide .figure__frame{aspect-ratio:21/9;}
.figure--square .figure__frame{aspect-ratio:1/1;}
.figure--grid .figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(to right,rgba(31,64,84,.55) 0 1px,transparent 1px 34px),
    repeating-linear-gradient(to bottom,rgba(31,64,84,.55) 0 1px,transparent 1px 34px);
  opacity:.5;
}
@media (max-width:600px){
  .figure--wide .figure__frame{aspect-ratio:16/9;}
}

/* 反白表格 */
.table-shell{
  overflow-x:auto;
  border:1px solid var(--line);
  background:var(--invert);
  color:var(--invert-ink);
}
.data-table{
  width:100%;min-width:520px;
  border-collapse:collapse;
  font-size:15px;line-height:1.6;
}
.data-table th,.data-table td{
  padding:11px 14px;
  border-bottom:1px solid rgba(10,26,36,.16);
  text-align:left;vertical-align:top;
}
.data-table thead th{
  font-size:12px;letter-spacing:.08em;font-weight:700;
  color:#2C4A5C;
  border-bottom:1px solid rgba(10,26,36,.38);
}
.data-table tbody tr:last-child td{border-bottom:0;}
.data-table .num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  text-align:right;white-space:nowrap;
}

/* 步骤条 */
.steps{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;background:var(--line);
  border:1px solid var(--line);
}
.step{background:var(--panel);padding:16px 18px;}
.step__num{
  display:block;margin-bottom:6px;
  font-family:var(--font-mono);font-size:20px;font-weight:600;
  color:var(--cyan);
}
@media (max-width:760px){
  .steps{grid-template-columns:1fr;}
}

/* 时间线 */
.timeline{position:relative;padding-left:22px;}
.timeline::before{
  content:"";position:absolute;left:5px;top:8px;bottom:8px;
  width:1px;background:var(--line);
}
.tl-item{position:relative;padding-bottom:24px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-20px;top:9px;
  width:7px;height:7px;background:var(--amber);
}

/* 筛选条 */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:12px 0;
  border-bottom:1px solid var(--line);
}
.filter-btn{
  padding:6px 12px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  transition:border-color var(--t-fast) ease,color var(--t-fast) ease,background-color var(--t-fast) ease;
}
.filter-btn:hover{border-color:var(--cyan);color:var(--cyan);}
.filter-btn[aria-pressed="true"]{
  border-color:var(--cyan);
  background:rgba(14,75,82,.42);
  color:var(--cyan-soft);
}
.filter-status{
  margin-left:auto;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--mist);
}
@media (max-width:600px){
  .filter-status{margin-left:0;width:100%;}
}

/* 筛选结果 / 显现 */
[data-filter-item].is-filtered{display:none;}
[data-filter-item].is-in,
[data-filter-item]{transition:opacity var(--t-base) ease;}
[data-reveal]{
  opacity:0;
  transform:translateX(-12px);
  transition:opacity var(--t-base) ease,transform var(--t-base) ease;
}
[data-reveal].is-in{opacity:1;transform:none;}

/* 抽屉打开时锁滚动 */
html.is-nav-open,html.is-nav-open body{overflow:hidden;}
@media (min-width:1024px){
  html.is-nav-open,html.is-nav-open body{overflow:auto;}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
  }
  [data-reveal]{opacity:1;transform:none;}
  .card:hover{transform:none;}
}