:root{
  --maple:#C8102E;
  --maple-dark:#8E0B20;
  --ice:#5B8FA8;
  --ice-soft:#DCE9EF;
  --snow:#F7F3EC;
  --paper:#EFE7DA;
  --pine:#1F3B32;
  --ink:#202422;
  --amber:#D98E2B;
  --fog:#C9C3B8;

  --border-hard:2px solid var(--ink);
  --shadow-soft:4px 4px 0 0 rgba(32,36,34,.14);
  --shadow-hard:5px 5px 0 0 var(--ink);
  --radius-panel:16px;
  --radius-pill:999px;

  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1200px;
  --gutter:clamp(16px,4vw,40px);
  --baseline:24px;
}

*,
*::before,
*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;}

body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--ink);
  background-color:var(--snow);
  background-image:repeating-linear-gradient(90deg,rgba(201,195,184,.26) 0 1px,transparent 1px 120px);
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{margin:0;font-family:var(--font-serif);font-weight:900;line-height:1.22;letter-spacing:-.02em;}
p{margin:0;}
ul,ol{margin:0;}
figure,blockquote{margin:0;}
a{color:inherit;}
img,svg{max-width:100%;}
img{height:auto;display:block;}
button{font:inherit;color:inherit;}
table{border-collapse:collapse;width:100%;}

::selection{background:var(--maple);color:#fff;}

:focus-visible{outline:3px solid var(--maple);outline-offset:3px;border-radius:6px;}
.site-footer :focus-visible{outline-color:var(--amber);}

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

@media (min-width:768px){
  body{font-size:17px;}
}

/* ===================== 通用容器 ===================== */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.rule-line{
  height:1px;
  border:0;
  margin:var(--baseline) 0;
  background:repeating-linear-gradient(90deg,var(--fog) 0 12px,transparent 12px 24px);
}

/* ===================== 头部 ===================== */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:999;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  background:var(--maple);
  color:#fff;
  font-weight:700;
  font-size:14px;
  text-decoration:none;
  transform:translateY(-160%);
  transition:transform .18s ease;
}
.skip-link:focus-visible{transform:translateY(0);}

.site-header{
  position:sticky;
  top:0;
  z-index:200;
  background:var(--snow);
  border-bottom:2px solid var(--ink);
  transition:box-shadow .2s ease;
}
.site-header[data-scrolled="true"]{
  box-shadow:0 8px 0 -3px rgba(31,59,50,.16);
}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:3px;
  background:transparent;
  pointer-events:none;
  z-index:3;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--maple) 0%,var(--ice) 100%);
  transition:width .12s linear;
}

.header-rule{
  height:10px;
  background-color:var(--pine);
  background-image:repeating-linear-gradient(90deg,rgba(247,243,236,.45) 0 2px,transparent 2px 30px);
}

.header-shell{
  position:relative;
  max-width:var(--shell);
  margin-inline:auto;
  padding:12px var(--gutter);
  display:flex;
  align-items:center;
  gap:14px;
  transition:padding .2s ease;
}
.site-header[data-scrolled="true"] .header-shell{padding-block:8px;}

.brand-lockup{
  display:grid;
  gap:1px;
  text-decoration:none;
  color:var(--ink);
  padding:2px 0;
  min-width:0;
  flex:none;
}
.brand-mark{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-serif);
  font-weight:900;
  font-size:22px;
  letter-spacing:-.03em;
  line-height:1.15;
}
.brand-mark-dot{
  width:10px;
  height:10px;
  flex:none;
  border-radius:50%;
  background:var(--maple);
  box-shadow:0 0 0 3px rgba(200,16,46,.16);
}
.brand-tagline{
  font-family:var(--font-sans);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--pine);
}
.brand-coord{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--ice);
  text-transform:uppercase;
}

.header-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex:none;
  padding:5px 12px;
  border:1px solid var(--fog);
  border-radius:var(--radius-pill);
  background:var(--paper);
  color:var(--pine);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  white-space:nowrap;
}
.status-pulse{
  width:7px;
  height:7px;
  flex:none;
  border-radius:50%;
  background:var(--maple);
  animation:statusPulse 2.6s ease-in-out infinite;
}
@keyframes statusPulse{
  0%,100%{opacity:1;transform:scale(1);}
  50%{opacity:.45;transform:scale(.8);}
}

.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:8px 14px;
  border:var(--border-hard);
  border-radius:var(--radius-pill);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  cursor:pointer;
  box-shadow:3px 3px 0 0 rgba(32,36,34,.18);
}
.nav-toggle:active{transform:translate(1px,1px);box-shadow:none;}
.nav-toggle-box{display:grid;gap:3px;width:16px;}
.nav-toggle-bar{
  display:block;
  height:2px;
  width:100%;
  border-radius:2px;
  background:var(--ink);
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-5px) rotate(-45deg);}
.nav-toggle-label{line-height:1;}

.nav-dock{
  margin-left:auto;
  padding:5px;
  border:var(--border-hard);
  border-radius:var(--radius-pill);
  background:var(--paper);
  box-shadow:var(--shadow-soft);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  padding:0;
  list-style:none;
}
.nav-item{flex:none;}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  border-radius:var(--radius-pill);
  text-decoration:none;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.01em;
  white-space:nowrap;
  transition:background .15s ease,color .15s ease;
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--ice);
}
.nav-link:hover{background:var(--ice-soft);color:var(--maple-dark);}
.nav-link:hover .nav-index{color:var(--maple-dark);}
.nav-link[aria-current="page"]{background:var(--maple);color:#fff;}
.nav-link[aria-current="page"] .nav-index{color:rgba(255,255,255,.82);}

/* ===================== 页脚 ===================== */
.site-footer{
  position:relative;
  margin-top:80px;
  background-color:var(--pine);
  color:var(--snow);
  border-top:2px solid var(--ink);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(247,243,236,.07) 0 1px,transparent 1px 84px),
    repeating-linear-gradient(0deg,rgba(247,243,236,.05) 0 1px,transparent 1px 84px);
}
.site-footer::after{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:6px;
  background-image:repeating-linear-gradient(90deg,var(--maple) 0 26px,transparent 26px 52px,var(--ice) 52px 78px,transparent 78px 104px);
  opacity:.85;
}

.footer-top{
  position:relative;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(40px,6vw,68px) var(--gutter) clamp(28px,4vw,44px);
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.25fr);
  gap:clamp(24px,4vw,48px);
  align-items:start;
}
.footer-brand{min-width:0;}
.footer-brand-mark{
  font-family:var(--font-serif);
  font-size:clamp(24px,3vw,32px);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.2;
  color:var(--snow);
}
.footer-tagline{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:rgba(220,233,239,.82);
}
.footer-summary{
  margin-top:16px;
  max-width:32em;
  font-size:15px;
  line-height:1.78;
  color:rgba(247,243,236,.8);
}
.footer-stamp{
  display:inline-block;
  margin-top:20px;
  padding:5px 12px;
  border:1px dashed rgba(247,243,236,.36);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:rgba(247,243,236,.62);
}

.footer-col{min-width:0;}
.footer-col-title{
  margin:0 0 14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(247,243,236,.2);
  font-family:var(--font-sans);
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--ice-soft);
}
.footer-nav-list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:8px 14px;
  padding:0;
  list-style:none;
}
.footer-link{
  display:inline-block;
  padding-bottom:1px;
  color:rgba(247,243,236,.9);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .15s ease,border-color .15s ease;
}
.footer-link:hover{color:#fff;border-bottom-color:var(--maple);}

.footer-contact{
  display:grid;
  gap:14px;
  padding:0;
  list-style:none;
}
.contact-line{display:grid;gap:3px;}
.contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(220,233,239,.7);
}
.contact-value{
  font-size:14px;
  line-height:1.6;
  color:var(--snow);
  overflow-wrap:anywhere;
}
.copy-button{
  justify-self:start;
  margin-top:5px;
  padding:4px 11px;
  border:1px solid rgba(247,243,236,.42);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--snow);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background .15s ease,border-color .15s ease,color .15s ease;
}
.copy-button:hover{background:var(--maple);border-color:var(--maple);}
.copy-button[data-copied="true"]{background:var(--amber);border-color:var(--amber);color:var(--ink);}

.footer-bar{
  position:relative;
  max-width:var(--shell);
  margin-inline:auto;
  padding:16px var(--gutter) 26px;
  border-top:1px solid rgba(247,243,236,.2);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 20px;
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:rgba(247,243,236,.66);
}
.footer-legal-links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
  margin:0;
  margin-left:auto;
  padding:0;
  list-style:none;
  font-size:13px;
}
.footer-top-button{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 15px;
  border:1px solid rgba(247,243,236,.42);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--snow);
  font-family:var(--font-sans);
  font-size:12px;
  font-weight:700;
  letter-spacing:.04em;
  cursor:pointer;
  transition:background .15s ease,color .15s ease;
}
.footer-top-button:hover{background:var(--snow);color:var(--pine);border-color:var(--snow);}

/* ===================== 基础组件 ===================== */
.panel{
  background:var(--snow);
  border:var(--border-hard);
  border-radius:var(--radius-panel);
  box-shadow:var(--shadow-soft);
  padding:clamp(20px,3vw,32px);
}
.panel--paper{background:var(--paper);}
.panel--pine{
  background:var(--pine);
  color:var(--snow);
  border-color:var(--ink);
}
.panel--pine .section-title,
.panel--pine .lede{color:var(--snow);}

.panel-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 16px;
  padding-bottom:14px;
  margin-bottom:20px;
  border-bottom:1px solid var(--fog);
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--maple-dark);
}
.panel--pine .eyebrow{color:var(--amber);}

.section-title{
  font-family:var(--font-serif);
  font-size:clamp(22px,3vw,32px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.22;
}
.lede{
  max-width:38em;
  font-size:16px;
  line-height:1.78;
  color:rgba(32,36,34,.84);
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,24px);
}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-12{grid-column:span 12;}

.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:clamp(16px,2.4vw,24px);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:2px solid var(--ink);
  border-radius:var(--radius-pill);
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease,color .15s ease;
}
.btn-primary{
  background:var(--maple);
  border-color:var(--maple-dark);
  color:#fff;
  box-shadow:4px 4px 0 0 rgba(31,59,50,.3);
}
.btn-primary:hover{background:var(--maple-dark);transform:translate(-1px,-1px);box-shadow:6px 6px 0 0 rgba(31,59,50,.3);}
.btn-ghost{
  background:var(--snow);
  color:var(--ink);
  box-shadow:4px 4px 0 0 var(--ink);
}
.btn-ghost:hover{background:var(--ice-soft);transform:translate(-1px,-1px);box-shadow:6px 6px 0 0 var(--ink);}
.btn:active{transform:translate(1px,1px);box-shadow:none;}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--fog);
  border-radius:var(--radius-pill);
  background:var(--paper);
  color:var(--pine);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.5;
}
.tag--maple{background:var(--maple);border-color:var(--maple-dark);color:#fff;}
.tag--ice{background:var(--ice-soft);border-color:var(--ice);color:var(--pine);}
.tag--amber{background:var(--amber);border-color:#9C6418;color:var(--ink);}

.breadcrumb{margin:0 0 20px;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(32,36,34,.62);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--fog);}
.breadcrumb-link{
  color:var(--pine);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .15s ease,color .15s ease;
}
.breadcrumb-link:hover{color:var(--maple-dark);border-bottom-color:var(--maple);}
.breadcrumb-current{color:var(--maple-dark);}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:var(--border-hard);
  border-radius:12px;
  background:linear-gradient(140deg,var(--ice-soft) 0%,var(--paper) 100%);
  box-shadow:var(--shadow-soft);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block;}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(31,59,50,.09) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(31,59,50,.07) 0 1px,transparent 1px 56px);
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame-caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:rgba(32,36,34,.62);
}

.metric-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:14px;
}
.metric{
  padding:14px 16px;
  border:1px solid var(--fog);
  border-radius:12px;
  background:var(--snow);
}
.metric-value{
  display:block;
  font-family:var(--font-mono);
  font-size:24px;
  font-weight:600;
  line-height:1.25;
  color:var(--maple-dark);
}
.metric-label{
  display:block;
  margin-top:4px;
  font-size:12px;
  letter-spacing:.08em;
  color:rgba(32,36,34,.66);
}

.note-block{
  padding:14px 18px;
  border-left:4px solid var(--ice);
  border-radius:0 12px 12px 0;
  background:var(--ice-soft);
  font-size:15px;
  line-height:1.72;
}

/* ===================== 显现动效 ===================== */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
.has-js [data-reveal][data-revealed="true"]{
  opacity:1;
  transform:none;
}

/* ===================== 响应式 ===================== */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex;}
  .nav-dock{
    position:absolute;
    top:calc(100% + 10px);
    left:var(--gutter);
    right:var(--gutter);
    margin-left:0;
    padding:10px;
    border-radius:18px;
    background:var(--paper);
    box-shadow:6px 6px 0 0 rgba(31,59,50,.2);
    max-height:min(70vh,480px);
    overflow:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
  }
  .nav-dock[data-open="true"]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:4px;}
  .nav-link{width:100%;padding:12px 14px;border-radius:12px;font-size:15px;}
  .nav-link[aria-current="page"]{border-radius:12px;}
}

@media (max-width:980px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-brand{grid-column:1 / -1;}
}

@media (max-width:860px){
  .header-status{display:none;}
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12;}
}

@media (max-width:780px){
  .brand-tagline{display:none;}
  .site-footer{margin-top:56px;}
  .footer-nav-list{grid-template-columns:1fr;}
  .footer-legal-links{margin-left:0;width:100%;}
  .footer-bar{gap:10px 16px;}
}

@media (max-width:620px){
  .footer-top{grid-template-columns:1fr;}
  .grid-12{gap:16px;}
  .lede{font-size:16px;}
  .btn{width:100%;}
}

@media (max-width:420px){
  .brand-mark{font-size:19px;}
  .brand-coord{font-size:9px;letter-spacing:.06em;}
  .nav-toggle{padding:7px 12px;}
}

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