/* =========================================================
   乐冠指南 · 共享站点样式 /assets/site.css
   深空蓝 + 霓虹青 + 暖橙 · 蓝图网格 · 控制台隐喻
   ========================================================= */

:root{
  --ink-950:#070C1C;
  --ink-900:#0A1024;
  --ink-850:#0E1630;
  --ink-800:#131C3A;
  --line:#22305A;
  --line-soft:rgba(34,48,90,.55);
  --cyan:#4FE3D0;
  --cyan-soft:#9BF3E8;
  --cyan-dim:rgba(79,227,208,.14);
  --orange:#FF8A3D;
  --orange-soft:#FFA463;
  --orange-dim:rgba(255,138,61,.14);
  --text:#E9EEF9;
  --text-soft:#D7DEEE;
  --muted:#9AA7C2;
  --focus:#7FD8FF;

  --radius-xl:32px;
  --radius-lg:24px;
  --radius-md:16px;
  --pill:999px;

  --maxw:1240px;
  --gutter:24px;
  --grid:24px;
  --header-h:88px;

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

/* ---------------- reset ---------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100%;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(34,48,90,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,48,90,.5) 1px,transparent 1px);
  background-size:var(--grid) var(--grid),var(--grid) var(--grid);
  background-position:-1px -1px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(1100px 680px at 80% -8%,rgba(79,227,208,.11),transparent 62%),
    radial-gradient(880px 560px at 4% 6%,rgba(255,138,61,.06),transparent 64%);
}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl{margin:0}
ul,ol{list-style:none;padding:0}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none;transition:color .2s ease}
a:hover{color:var(--cyan-soft)}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}
mark{background:var(--orange);color:#1B0C02;border-radius:4px;padding:0 3px}
::selection{background:var(--cyan);color:#04211E}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:6px}

/* ---------------- 排版 ---------------- */
h1{font-size:clamp(2.6rem,7vw,5.6rem);font-weight:900;line-height:1.06;letter-spacing:-.02em}
h2{font-size:clamp(1.9rem,4vw,3rem);font-weight:800;line-height:1.16;letter-spacing:-.015em}
h3{font-size:clamp(1.15rem,2vw,1.45rem);font-weight:700;line-height:1.4;letter-spacing:-.01em}
.mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.muted{color:var(--muted)}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------------- 骨架 ---------------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
#main-content{padding-top:var(--header-h);display:block}
.section{padding-block:clamp(60px,8vw,96px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px;
  padding-top:22px;border-top:1px solid var(--line);margin-bottom:34px;
}
.section-title{font-size:clamp(1.6rem,3.4vw,2.5rem);font-weight:800;letter-spacing:-.015em;line-height:1.2}
.section-lede{max-width:56ch;font-size:16.5px;color:var(--muted)}

/* ---------------- 头部 ---------------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:80;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease,box-shadow .3s ease,backdrop-filter .3s ease;
}
.site-header[data-scrolled="true"],
.site-header[data-nav-open="true"]{
  background:rgba(10,16,36,.95);
  border-bottom-color:var(--line);
  box-shadow:0 22px 48px -34px rgba(0,0,0,.95);
  backdrop-filter:saturate(150%) blur(14px);
}
.header-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;
  min-height:var(--header-h);
  padding-block:14px;
}
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:120;
  padding:10px 20px;border-radius:var(--pill);
  background:var(--cyan);color:#04211E;font-size:14px;font-weight:700;
  transition:top .2s ease;
}
.skip-link:focus{top:12px;color:#04211E}

.brand-block{display:flex;flex-direction:column;gap:3px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:12px}
.brand-mark{
  position:relative;flex:none;
  width:32px;height:32px;border-radius:11px;
  border:1px solid var(--cyan);
  background:linear-gradient(140deg,rgba(79,227,208,.32),rgba(79,227,208,0) 68%);
}
.brand-mark::before{content:"";position:absolute;inset:9px;border-radius:4px;background:var(--cyan);opacity:.9}
.brand-mark::after{content:"";position:absolute;left:50%;top:50%;width:6px;height:6px;transform:translate(-50%,-50%) rotate(45deg);background:var(--ink-900)}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{font-size:19px;font-weight:800;letter-spacing:-.01em}
.brand-line{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--muted);text-transform:uppercase}
.brand-tagline{font-size:12.5px;line-height:1.5;color:var(--muted);max-width:36ch}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 15px;border-radius:var(--pill);
  border:1px solid var(--line);background:var(--ink-850);
  color:var(--text);font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;cursor:pointer;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan-soft)}
.nav-toggle-bars{position:relative;display:block;width:18px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:var(--cyan);
  transition:transform .25s ease,top .25s ease,bottom .25s ease;
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{bottom:4.5px;transform:rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:26px}
.nav-list{display:flex;align-items:center;gap:2px;counter-reset:navidx}
.nav-item{counter-increment:navidx;position:relative}
.nav-link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:8px 13px;border-radius:var(--pill);
  font-size:14.5px;white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}
.nav-link::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--muted);
  transition:color .2s ease;
}
.nav-link:hover{background:rgba(79,227,208,.09);color:var(--cyan-soft)}
.nav-link:hover::before{color:var(--cyan-soft)}
.nav-link[aria-current="page"]{background:var(--cyan-dim);color:var(--cyan)}
.nav-link[aria-current="page"]::before{color:var(--cyan)}

.nav-foot{
  display:flex;align-items:center;gap:16px;
  padding-left:22px;border-left:1px solid var(--line);
}
.header-status{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 13px;border-radius:var(--pill);
  border:1px solid var(--line);background:var(--ink-850);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;color:var(--muted);
  white-space:nowrap;
}
.status-dot{
  width:6px;height:6px;border-radius:50%;flex:none;
  background:var(--cyan);box-shadow:0 0 0 3px var(--cyan-dim);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.nav-cta{white-space:nowrap}

.scroll-track{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;background:transparent}
.scroll-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft));
}

/* ---------------- 按钮 / 标签 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 21px;border-radius:var(--pill);border:1px solid transparent;
  font-size:14.5px;font-weight:600;white-space:nowrap;cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#1B0C02}
.btn-primary:hover{background:var(--orange-soft);border-color:var(--orange-soft);color:#1B0C02;transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan-soft);transform:translateY(-1px)}
.btn-cyan{background:var(--cyan);border-color:var(--cyan);color:#04211E}
.btn-cyan:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04211E;transform:translateY(-1px)}

.capsule{
  display:inline-flex;align-items:center;height:28px;padding:0 13px;
  border-radius:var(--pill);border:1px solid var(--cyan);background:transparent;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--cyan);
  white-space:nowrap;
}
.capsule--solid{background:var(--orange);border-color:var(--orange);color:#1B0C02}
.capsule--muted{border-color:var(--line);background:var(--ink-850);color:var(--muted)}

.chip{
  display:inline-flex;align-items:center;gap:7px;height:28px;padding:0 13px;
  border-radius:var(--pill);border:1px solid rgba(79,227,208,.38);
  background:var(--cyan-dim);color:var(--cyan-soft);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;white-space:nowrap;
}
.chip-warn{border-color:rgba(255,138,61,.42);background:var(--orange-dim);color:#FFC29B}
.chip-mute{border-color:var(--line);background:var(--ink-850);color:var(--muted)}

/* ---------------- 索引 / 旁注 ---------------- */
.index-mark{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);
}
.index-mark::before{content:"";width:26px;height:1px;background:var(--cyan);opacity:.85}
.annotation{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--muted);
}
.annotation--rotated{writing-mode:horizontal-tb;transform:rotate(-90deg);transform-origin:left top}

/* ---------------- 面板 / 网格 ---------------- */
.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:clamp(22px,3vw,34px);
}
.panel--soft{background:var(--ink-850)}
.panel--cyan{border-color:rgba(79,227,208,.42)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--grid)}
.col-main{grid-column:span 8;min-width:0}
.col-side{grid-column:span 4;min-width:0}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--grid)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--grid)}

/* ---------------- 时间轴 ---------------- */
.timeline{position:relative;display:flex;flex-direction:column;gap:28px;padding-left:30px}
.timeline::before{content:"";position:absolute;left:5px;top:10px;bottom:10px;width:1px;background:var(--line)}
.timeline-item{position:relative;min-width:0}
.timeline-node{
  position:absolute;left:-30px;top:8px;width:12px;height:12px;border-radius:50%;
  background:var(--ink-900);border:1px solid var(--line);
  transition:border-color .35s ease,box-shadow .35s ease;
}
.timeline-item[data-state="active"] .timeline-node{
  border:2px solid var(--cyan);
  box-shadow:0 0 0 4px var(--cyan-dim);
}

/* ---------------- 面包屑 ---------------- */
.breadcrumb{padding-block:20px}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted)}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li::after{content:"/";color:var(--line)}
.breadcrumb li:last-child::after{display:none}
.breadcrumb li[aria-current="page"]{color:var(--text)}

/* ---------------- 正文 ---------------- */
.prose{max-width:62ch;font-size:16.5px;line-height:1.85;color:var(--text-soft)}
.prose > * + *{margin-top:18px}
.prose h2{font-size:clamp(1.4rem,2.6vw,1.9rem);font-weight:800;letter-spacing:-.01em;color:var(--text);margin-top:38px}
.prose h3{font-size:1.18rem;font-weight:700;color:var(--text);margin-top:28px}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:#fff;font-weight:700}
.prose ul li{position:relative;padding-left:22px;margin-top:10px}
.prose ul li::before{content:"";position:absolute;left:0;top:.85em;width:9px;height:1px;background:var(--cyan)}
.prose blockquote{
  padding:18px 24px;border-left:2px solid var(--cyan);
  border-radius:0 var(--radius-md) var(--radius-md) 0;
  background:var(--ink-850);color:var(--muted);
}

/* ---------------- 展开条目 ---------------- */
.accordion{
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--ink-850);padding:0 24px;
  transition:border-color .25s ease,background .25s ease;
}
.accordion + .accordion{margin-top:12px}
.accordion[open]{border-color:rgba(79,227,208,.42);background:var(--ink-800)}
.accordion summary{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:18px 0;cursor:pointer;font-weight:600;list-style:none;
}
.accordion summary::-webkit-details-marker{display:none}
.accordion summary::after{
  content:"+";flex:none;font-family:var(--font-mono);font-size:17px;color:var(--cyan);
  transition:transform .25s ease;
}
.accordion[open] summary::after{transform:rotate(45deg)}
.accordion-body{padding-bottom:20px;font-size:15px;line-height:1.8;color:var(--muted);max-width:62ch}

/* ---------------- 筛选 ---------------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.filter-btn{
  padding:8px 15px;border-radius:var(--pill);
  border:1px solid var(--line);background:var(--ink-850);color:var(--muted);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.filter-btn:hover{border-color:var(--cyan);color:var(--cyan-soft)}
.filter-btn[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04211E}
[data-filter-item][hidden]{display:none !important}

/* ---------------- 图片容器 ---------------- */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius-lg);border:1px solid var(--line);
  background:linear-gradient(150deg,rgba(79,227,208,.09),rgba(10,16,36,.92) 62%),var(--ink-800);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.4;
  background-image:
    linear-gradient(rgba(34,48,90,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,48,90,.5) 1px,transparent 1px);
  background-size:32px 32px;
}
.media--16x9{aspect-ratio:16 / 9}
.media--4x3{aspect-ratio:4 / 3}
.media--3x2{aspect-ratio:3 / 2}
.media--1x1{aspect-ratio:1 / 1}
.media--tall{aspect-ratio:4 / 5}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--muted)}
.media-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--grid)}

/* ---------------- 页脚 ---------------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,120px);
  padding-top:clamp(52px,7vw,76px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(19,28,58,.55),rgba(10,16,36,.99) 46%);
}
.footer-grid{
  display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:44px 34px;padding-bottom:56px;
}
.footer-brand{display:flex;flex-direction:column;gap:18px;max-width:36ch}
.footer-note{font-size:14.5px;line-height:1.8;color:var(--muted)}
.footer-chips{display:flex;flex-wrap:wrap;gap:8px}
.footer-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-col-title{
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{font-size:14.5px;color:var(--muted);transition:color .2s ease,padding-left .2s ease}
.footer-link:hover{color:var(--cyan-soft);padding-left:6px}

.footer-contact-strip{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:22px 32px;padding-block:32px;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.contact-item{display:flex;flex-direction:column;gap:6px;min-width:0}
.contact-item--wide{grid-column:span 1}
.contact-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.contact-value{font-size:14.5px;color:var(--text);word-break:break-word}
a.contact-value:hover{color:var(--cyan-soft)}
.contact-note{grid-column:1 / -1;max-width:72ch;font-size:13px;line-height:1.75;color:var(--muted)}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px;padding-block:24px 42px;
}
.footer-legal{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted)}
.footer-copy{font-size:12.5px;color:var(--muted)}

/* ---------------- 显现动效 ---------------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.22,.61,.36,1);
  transition-delay:var(--reveal-delay,0ms);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------------- 响应式 ---------------- */
@media (max-width:1180px){
  .brand-tagline{display:none}
  .header-status{display:none}
  .nav-foot{padding-left:16px}
}
@media (max-width:1000px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:38px 28px}
  .footer-brand{grid-column:1 / -1;max-width:none}
  .footer-contact-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:960px){
  :root{--header-h:80px}
  .nav-toggle{display:inline-flex}
  .header-inner{position:relative}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:grid;gap:20px;
    padding:22px var(--gutter) 28px;
    background:rgba(10,16,36,.98);
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(14px);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .25s ease,transform .25s ease,visibility .25s ease;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:12px 14px;font-size:16px;border-radius:var(--radius-md)}
  .nav-link::before{font-size:11px}
  .nav-foot{
    flex-direction:column;align-items:stretch;gap:12px;
    padding-left:0;padding-top:18px;border-left:0;border-top:1px solid var(--line);
  }
  .header-status{display:inline-flex;justify-content:center}
  .nav-cta{width:100%}
  .grid-12{grid-template-columns:1fr}
  .col-main,.col-side{grid-column:1 / -1}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:700px){
  :root{--header-h:74px;--gutter:18px}
  body{font-size:16px}
  .brand-name{font-size:17px}
  .brand-line{font-size:10px;letter-spacing:.08em}
  .section-head{flex-direction:column;align-items:flex-start}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:34px}
  .footer-contact-strip{grid-template-columns:1fr;gap:18px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .accordion{padding:0 18px}
  .panel{padding:20px}
}

/* ---------------- 无障碍动效降级 ---------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .status-dot{animation:none;opacity:1}
}