/* ============================================================
   美高官网 · 共享样式 /assets/site.css
   01 reset · 02 tokens · 03 base · 04 layout · 05 buttons
   06 header · 07 footer · 08 atoms · 09 reveal · 10 a11y
   ============================================================ */

/* ---------- 01 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,dl,dt,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[id]{scroll-margin-top:calc(var(--header-h) + 24px)}

/* ---------- 02 tokens ---------- */
:root{
  --ink:#08141F;
  --ink-2:#0E2233;
  --ink-3:#12283A;
  --jade:#123A3C;
  --indigo:#241A3A;
  --gold:#C9A227;
  --gold-soft:#E8C97A;
  --coral:#FF6B4A;
  --celadon:#5FBFA0;
  --paper:#F2EFE9;
  --mist:#8FA6B8;
  --line:#1E3A52;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
  --shell:1180px;
  --header-h:96px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --font-display:"Sora","PingFang SC","Hiragino Sans GB","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;
}

/* ---------- 03 base ---------- */
body{
  background-color:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3{text-wrap:balance}
p{text-wrap:pretty}
::selection{background:var(--gold);color:var(--ink)}
:where(a,button,[tabindex]):focus-visible{outline:2px solid var(--gold);outline-offset:3px}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:120;
  padding:10px 18px;border-radius:var(--radius-pill);
  background:var(--gold);color:#0A1520;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  transform:translateY(-200%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 04 layout ---------- */
.shell{width:min(100% - 32px,var(--shell));margin-inline:auto}
@media (min-width:768px){.shell{width:min(100% - 56px,var(--shell))}}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px}
.main-grid{display:grid;gap:36px}
@media (min-width:1024px){
  .main-grid{grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:44px;align-items:start}
}
.side-rail{display:grid;gap:16px}
@media (min-width:1024px){
  .side-rail{position:sticky;top:calc(var(--header-h) + 20px)}
}

/* ---------- 05 buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:14.5px;font-weight:600;letter-spacing:.02em;line-height:1.3;
  white-space:nowrap;cursor:pointer;
  transition:transform var(--dur) var(--ease),background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-sm{padding:9px 16px;font-size:13.5px}
.btn-accent{background:var(--coral);color:#14060A}
.btn-accent:hover{background:#FF8163;color:#14060A}
.btn-gold{background:var(--gold);color:#0A1520}
.btn-gold:hover{background:var(--gold-soft);color:#0A1520}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--paper)}
.btn-ghost:hover{border-color:var(--gold-soft);color:var(--gold-soft)}

/* ---------- 06 header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background-color:var(--ink);
  isolation:isolate;
  transition:box-shadow var(--dur) var(--ease);
}
.site-header[data-compact="true"]{box-shadow:0 20px 40px -28px rgba(0,0,0,.95)}

.header-progress{
  position:absolute;left:0;right:0;top:0;height:2px;
  background-color:transparent;z-index:3;
}
.header-progress-bar{
  display:block;width:100%;height:100%;
  background-color:var(--gold);
  transform:scaleX(0);transform-origin:left center;
  transition:transform 120ms linear;
}

.header-frame{
  position:relative;
  width:min(100% - 32px,var(--shell));
  margin-inline:auto;
  padding-top:14px;
  display:flex;align-items:center;gap:10px;
}

/* 品牌岛 */
.brand-island{
  flex:0 0 auto;
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 18px 8px 10px;
  border-radius:var(--radius-pill);
  background-color:var(--ink-2);
  border:1px solid var(--line);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.brand-island:hover{border-color:var(--gold-soft);background-color:var(--ink-3)}
.brand-glyph{
  display:grid;place-items:center;flex:0 0 auto;
  width:34px;height:34px;border-radius:12px;
  background-color:var(--gold);color:#0A1520;
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  letter-spacing:.01em;line-height:1;
}
.brand-text{display:flex;flex-direction:column;line-height:1.18}
.brand-name{font-family:var(--font-display);font-size:17px;font-weight:700;letter-spacing:.16em}
.brand-tag{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--mist);text-transform:uppercase;
}

/* 栏目胶囊岛 */
.nav-island{flex:1 1 auto;display:flex;justify-content:center;min-width:0}
.nav-list{
  display:flex;align-items:center;gap:2px;
  padding:6px;border-radius:var(--radius-pill);
  background-color:var(--ink-2);border:1px solid var(--line);
}
.nav-link{
  display:inline-block;
  padding:8px 14px;border-radius:var(--radius-pill);
  font-size:14.5px;color:var(--mist);white-space:nowrap;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-link:hover{color:var(--paper);background-color:var(--ink-3)}
.nav-link[aria-current="page"]{background-color:var(--gold);color:#0A1520;font-weight:600}

/* 动作岛 */
.action-island{flex:0 0 auto;display:flex;align-items:center;gap:8px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 14px;border-radius:var(--radius-pill);
  background-color:var(--ink-2);border:1px solid var(--line);
  color:var(--paper);font-size:13px;font-weight:600;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold-soft)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px;flex:0 0 auto}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;border-radius:2px;
  background-color:currentColor;
  transition:transform var(--dur) var(--ease),top var(--dur) var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle-label{white-space:nowrap}
.site-header[data-open="true"] .nav-toggle{background-color:var(--gold);border-color:var(--gold);color:#0A1520}
.site-header[data-open="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}

/* 信号尺 · V4 入口分类 */
.rail{
  position:relative;overflow:hidden;max-height:64px;
  transition:opacity var(--dur) var(--ease);
}
.site-header[data-compact="true"] .rail{opacity:.55}
.rail-inner{
  position:relative;
  width:min(100% - 32px,var(--shell));
  margin-inline:auto;
  padding:6px 0 16px;
  display:flex;align-items:center;flex-wrap:wrap;gap:8px 18px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.13em;
  color:var(--mist);text-transform:uppercase;
}
.rail-inner::after{
  content:"";position:absolute;left:0;right:0;bottom:5px;height:5px;
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 34px);
  opacity:.9;pointer-events:none;
}
.rail-status{display:inline-flex;align-items:center;gap:8px;color:var(--mist);letter-spacing:.08em}
.status-dot{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background-color:var(--celadon);
  box-shadow:0 0 0 3px rgba(95,191,160,.16);
}
.rail-label{color:var(--gold)}
.rail-list{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.rail-link{
  color:var(--mist);padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.rail-link:hover{color:var(--paper);border-bottom-color:var(--gold-soft)}
.rail-index{margin-left:auto;color:#2F4C64;letter-spacing:.2em}

/* ---------- 07 footer ---------- */
.site-footer{
  position:relative;
  background-color:var(--ink-2);
  border-top:1px solid var(--line);
  padding-block:clamp(40px,6vw,72px) 28px;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:6px;
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 40px);
  opacity:.85;pointer-events:none;
}
.footer-shell{display:grid;gap:0}

.footer-top{display:grid;gap:32px}
@media (min-width:900px){
  .footer-top{grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:44px;align-items:start}
}

.footer-intro{display:grid;gap:16px;justify-items:start;max-width:34em}
.footer-brand{display:inline-flex;align-items:center;gap:12px}
.footer-brand-text{
  font-family:var(--font-display);font-size:20px;font-weight:700;letter-spacing:.18em;
  color:var(--paper);
}
.footer-brand:hover .footer-brand-text{color:var(--gold-soft)}
.footer-summary{font-size:15.5px;line-height:1.8;color:rgba(242,239,233,.88)}
.footer-note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--mist);line-height:1.8;
}

.footer-contact{
  display:grid;gap:14px;justify-items:start;
  padding:clamp(20px,3vw,26px);
  border-radius:var(--radius-lg);
  background-color:var(--indigo);
  border:1px solid #33264F;
}
.footer-contact-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--gold-soft);
}
.contact-list{display:grid;gap:12px;width:100%}
.contact-row{display:grid;gap:2px}
.contact-row dt{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:#A99BC0;
}
.contact-row dd{
  margin:0;font-size:14.5px;line-height:1.6;color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-contact-note{font-size:12.5px;line-height:1.75;color:#B7A9CE}
.footer-contact-cta{justify-self:start}

.footer-columns{
  margin-top:clamp(32px,5vw,48px);
  padding-top:clamp(24px,4vw,36px);
  border-top:1px solid var(--line);
  display:grid;gap:26px;
}
@media (min-width:720px){.footer-columns{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}}

.footer-col{display:grid;gap:12px;align-content:start}
.footer-col-title{
  display:flex;align-items:baseline;gap:8px;
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.18em;color:var(--gold);
}
.footer-col-index{color:var(--mist);opacity:.6}
.footer-list{display:grid;gap:10px}
.footer-list a{
  display:inline-block;font-size:15px;color:var(--mist);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-list a:hover{color:var(--paper);transform:translateX(3px)}

.footer-bottom{
  margin-top:clamp(28px,4vw,40px);
  padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist);
}
.footer-icp{color:var(--mist)}
.footer-copy{color:var(--mist)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{
  color:var(--mist);
  transition:color var(--dur) var(--ease);
}
.footer-legal a:hover{color:var(--gold-soft)}

/* ---------- 08 content atoms ---------- */
.section{padding-block:clamp(44px,7vw,88px)}
.section-head{
  display:flex;align-items:baseline;justify-content:space-between;
  flex-wrap:wrap;gap:10px 20px;margin-bottom:26px;
}
.display{
  font-family:var(--font-display);
  font-size:clamp(38px,6.2vw,78px);
  font-weight:700;line-height:1.04;letter-spacing:-.02em;
  max-width:14em;
}
.section-title{
  display:flex;align-items:baseline;flex-wrap:wrap;gap:12px;
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,34px);font-weight:700;line-height:1.22;letter-spacing:-.01em;
}
.section-index{font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:.16em;color:var(--gold)}
.eyebrow{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);
}
.lede{font-size:clamp(17px,1.6vw,20px);line-height:1.72;color:rgba(242,239,233,.9);max-width:32em}
.prose{max-width:36em;color:rgba(242,239,233,.88)}
.prose p + p{margin-top:1em}
.meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mist)}
.index-num{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--gold)}

.divider{border:0;height:1px;background-color:var(--line);margin-block:32px}

.panel{
  padding:clamp(20px,3vw,32px);
  border-radius:var(--radius-lg);
  background-color:var(--ink-2);
  border:1px solid var(--line);
}
.panel--jade{background-color:var(--jade);border-color:#1B5054}
.panel--indigo{background-color:var(--indigo);border-color:#33264F}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  border:1px solid var(--line);color:var(--mist);
}
.tag--gold{color:var(--gold);border-color:rgba(201,162,39,.45);background-color:rgba(201,162,39,.1)}
.tag--jade{color:var(--celadon);border-color:rgba(95,191,160,.42);background-color:rgba(95,191,160,.1)}
.tag--coral{color:var(--coral);border-color:rgba(255,107,74,.42);background-color:rgba(255,107,74,.1)}

.status-chip{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--celadon);
}

/* 图像容器基础规则 */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  border-radius:var(--radius-lg);
  background-color:var(--ink-2);
  border:1px solid var(--line);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(30,58,82,.55) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,rgba(30,58,82,.38) 0 1px,transparent 1px 64px);
  opacity:.5;
}
.media--wide{aspect-ratio:16/9}
.media--banner{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:4/5}
.media-caption{
  display:flex;align-items:baseline;gap:10px;
  margin-top:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist);
}
@media (max-width:600px){.media--banner{aspect-ratio:3/2}}

/* 面包屑 */
.breadcrumbs{
  margin-bottom:20px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--mist);
}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs-list li{display:flex;align-items:center;gap:8px}
.breadcrumbs-list li + li::before{content:"/";color:#2C4A63}
.breadcrumbs-list a{
  color:var(--mist);border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.breadcrumbs-list a:hover{color:var(--gold-soft);border-bottom-color:var(--gold-soft)}
.breadcrumbs-list [aria-current="page"]{color:var(--paper)}

/* ---------- 09 reveal ---------- */
html[data-reveal-ready] [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity 240ms var(--ease),transform 240ms var(--ease);
}
html[data-reveal-ready] [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 10 移动 / 平板 ---------- */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .nav-island{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:none;
    padding:10px;
    background-color:var(--ink-2);
    border:1px solid var(--line);
    border-radius:24px;
    box-shadow:0 26px 46px -20px rgba(0,0,0,.95);
  }
  .site-header[data-open="true"] .nav-island{display:block}
  .nav-list{
    flex-direction:column;align-items:stretch;gap:2px;
    padding:0;background-color:transparent;border:0;
  }
  .nav-link{display:block;padding:12px 14px;border-radius:16px;font-size:16px;color:var(--paper)}
  .nav-link[aria-current="page"]{border-radius:16px}
  .rail-inner{font-size:10px;gap:6px 14px}
  .rail-index{display:none}
}

@media (max-width:767px){
  .header-frame{padding-top:12px;gap:8px}
  .brand-island{padding:7px 14px 7px 8px}
  .brand-glyph{width:30px;height:30px;border-radius:10px;font-size:12px}
  .brand-name{font-size:15.5px;letter-spacing:.12em}
  .rail-inner{flex-wrap:nowrap;overflow-x:auto;gap:12px;scrollbar-width:none}
  .rail-inner::-webkit-scrollbar{display:none}
  .rail-status,.rail-label,.rail-link{white-space:nowrap}
  .rail-list{flex-wrap:nowrap}
  :root{--header-h:88px}
}

@media (max-width:559px){
  .action-island .btn{display:none}
  .brand-tag{display:none}
  .footer-bottom{justify-content:flex-start}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html[data-reveal-ready] [data-reveal]{opacity:1;transform:none}
}