:root{
  --bg:#F3F7FB;--bg-deep:#E6EFF7;--card:#FFFFFF;--soft:#DCEBF5;--ink:#10263A;--text:#263B4C;
  --muted:#60788C;--faint:#8094A5;--blue:#3B9FE0;--blue2:#67B9EC;--steel:#1E6FB8;--ice:#B8DDF3;
  --mint:#39A69C;--border:rgba(30,111,184,.16);--border-strong:rgba(59,159,224,.38);
  --shadow:0 14px 36px rgba(16,38,58,.08);--radius:14px;--max:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}
body.modal-open{overflow:hidden}
img{display:block;max-width:100%;height:auto}
a{color:var(--steel);text-decoration:none}
a:hover{text-decoration:underline}
button,input{font:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid rgba(59,159,224,.38);outline-offset:3px}
.skip-link{position:fixed;left:16px;top:-60px;z-index:9999;background:#fff;color:var(--ink);padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}
.skip-link:focus{top:12px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.topbar{position:sticky;top:0;z-index:50;height:72px;background:rgba(243,247,251,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);box-shadow:0 6px 18px rgba(16,38,58,.04)}
.topbar-inner{max-width:var(--max);height:100%;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:16px}
.brand{display:inline-flex;align-items:center;min-height:44px}
.brand img{height:34px;width:auto}
.brand-fallback{font-size:21px;font-weight:800;color:var(--ink);letter-spacing:.02em}
.brand-note{color:var(--muted);font-size:14px;white-space:nowrap}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-button,.menu-button,.close-button,.rail-all{min-height:44px;border:1px solid var(--border-strong);background:#fff;color:var(--steel);border-radius:10px;padding:0 15px;font-weight:700}
.icon-button:hover,.menu-button:hover,.close-button:hover,.rail-all:hover{background:var(--soft);text-decoration:none}
.top-app-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border-radius:10px;background:linear-gradient(135deg,var(--blue2),var(--blue) 52%,var(--steel));color:#fff;font-weight:700}
.top-app-link:hover{text-decoration:none;filter:brightness(.98)}
.site-shell{max-width:var(--max);margin:0 auto;padding:28px 20px 72px;display:grid;grid-template-columns:220px minmax(0,1fr);gap:30px;align-items:start}
.category-rail{position:sticky;top:96px;padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:rgba(255,255,255,.84);box-shadow:var(--shadow)}
.rail-group+.rail-group{margin-top:18px;padding-top:16px;border-top:1px solid var(--border)}
.rail-label{margin:0 0 8px;color:var(--faint);font-size:12px;font-weight:800;letter-spacing:.1em}
.rail-link{display:block;padding:9px 10px;border-left:3px solid transparent;border-radius:9px;color:var(--ink)}
.rail-link:hover{text-decoration:none;background:var(--bg)}
.rail-link strong,.rail-link span{display:block}
.rail-link strong{font-size:15px}
.rail-link span{font-size:12px;color:var(--muted)}
.rail-text-link{display:block;padding:7px 10px;border-left:3px solid transparent;border-radius:8px;color:var(--text);font-size:14px}
.rail-link.is-current,.rail-text-link.is-current{border-left-color:var(--steel);background:var(--bg-deep);font-weight:800}
.rail-all{width:100%;margin-top:18px}
.main-content{min-width:0}
.breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:14px;margin-bottom:16px}
.breadcrumb a{color:var(--steel)}
.page-hero,.brand-cover{border:1px solid var(--border);background:#fff;border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.page-kicker,.section-heading span,.eyebrow{display:block;color:var(--steel);font-weight:800;font-size:13px;letter-spacing:.08em}
h1,h2,h3{color:var(--ink);line-height:1.32;margin-top:0}
h1{font-size:clamp(30px,4vw,38px);margin-bottom:14px;scroll-margin-top:96px}
h2{font-size:clamp(22px,3vw,28px);margin-bottom:10px}
h3{font-size:18px;margin-bottom:7px}
p{margin:0 0 1em}
.lead{font-size:18px;color:var(--text);max-width:850px}
.action-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.button-primary,.button-secondary{display:inline-flex;min-height:44px;align-items:center;justify-content:center;padding:0 18px;border-radius:10px;font-weight:800}
.button-primary{background:linear-gradient(135deg,var(--blue2),var(--blue) 52%,var(--steel));color:#fff}
.button-secondary{background:#fff;color:var(--steel);border:1px solid var(--border-strong)}
.button-primary:hover,.button-secondary:hover{text-decoration:none;transform:translateY(-1px)}
.media-box{margin:0;border:1px solid var(--border);border-radius:14px;background:linear-gradient(150deg,#fff,var(--bg-deep));overflow:hidden}
.media-box img{width:100%;height:auto;object-fit:contain;object-position:center}
.media-placeholder{aspect-ratio:16/9;min-height:180px;display:grid;place-items:center;padding:28px;text-align:center;background:
linear-gradient(135deg,rgba(103,185,236,.12),rgba(57,166,156,.08)),
repeating-linear-gradient(0deg,transparent,transparent 28px,rgba(30,111,184,.04) 29px);
color:var(--steel);font-weight:800;letter-spacing:.04em}
.app-media .media-placeholder{aspect-ratio:4/5;max-height:460px}
.icon-media .media-placeholder{aspect-ratio:1/1;min-height:80px}
.hero-media{margin-bottom:20px}
.hero-media img{max-height:420px;object-fit:contain}
.section-block{margin-top:30px;padding:24px;border:1px solid var(--border);border-radius:16px;background:#fff}
.section-heading{margin-bottom:15px}
.section-copy p:last-child{margin-bottom:0}
.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.info-card,.task-card,.topic-card,.step-card,.list-card{background:var(--bg);border:1px solid var(--border);border-radius:13px;padding:18px}
.info-card strong,.task-card strong,.topic-card strong,.step-card strong{display:block;color:var(--ink);margin-bottom:6px}
.task-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:28px}
.task-card{min-height:160px;display:flex;flex-direction:column}
.task-card a{margin-top:auto;font-weight:800}
.task-card .number{font-size:28px;font-weight:900;color:var(--blue)}
.asym-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:16px}
.asym-side{display:grid;gap:16px}
.channel-band{display:grid;grid-template-columns:minmax(280px,.9fr) 1.1fr;gap:20px;align-items:center}
.channel-band.reverse{grid-template-columns:1.1fr minmax(280px,.9fr)}
.channel-band.reverse .media-box{order:2}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.tag{display:inline-block;padding:4px 9px;border-radius:8px;background:var(--bg-deep);color:var(--steel);font-size:13px}
.node-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px}
.node{padding:16px;border-left:4px solid var(--blue);background:var(--bg);border-radius:10px}
.mosaic{display:grid;grid-template-columns:repeat(12,1fr);gap:12px}
.mosaic article{padding:18px;border-radius:14px;border:1px solid var(--border);background:var(--bg-deep);min-height:150px}
.mosaic article:nth-child(1),.mosaic article:nth-child(4){grid-column:span 7}
.mosaic article:nth-child(2),.mosaic article:nth-child(3){grid-column:span 5}
.mosaic article:nth-child(5),.mosaic article:nth-child(6){grid-column:span 6}
.mosaic .num{display:block;color:var(--steel);font-weight:900;font-size:24px}
.split-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.shelf-layers{display:grid;gap:10px}
.shelf-layer{border-left:5px solid var(--mint);background:var(--bg);padding:14px 16px;border-radius:10px}
.number-list{counter-reset:item;display:grid;gap:10px}
.number-list article{counter-increment:item;padding:14px 16px 14px 58px;position:relative;border:1px solid var(--border);border-radius:10px;background:#fff}
.number-list article:before{content:counter(item,decimal-leading-zero);position:absolute;left:15px;top:12px;color:var(--steel);font-weight:900}
.tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.tool-item{padding:18px;border:1px solid var(--border);border-radius:13px;background:var(--bg)}
.demo-control{margin-top:14px}
.demo-control button{min-height:44px;border:1px solid var(--border-strong);border-radius:10px;background:#fff;color:var(--steel);font-weight:800;padding:0 15px}
.density-demo.is-compact p{line-height:1.5;margin-bottom:.55em}
.mobile-showcase{display:grid;grid-template-columns:minmax(220px,.7fr) 1.3fr;gap:26px;align-items:center}
.feature-list{display:grid;gap:12px}
.feature-list article{padding:15px 16px;background:var(--bg);border-radius:11px;border:1px solid var(--border)}
.boundary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.timeline,.process-list{display:grid;gap:13px}
.process-item{display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:start;padding:16px;border:1px solid var(--border);border-radius:12px;background:#fff}
.process-item .step{display:grid;place-items:center;width:44px;height:44px;border-radius:10px;background:var(--bg-deep);color:var(--steel);font-weight:900}
.board{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.board-column{padding:14px;border-radius:12px;background:var(--bg);border:1px solid var(--border);min-height:210px}
.board-column h3{font-size:16px}
.board-column p{font-size:14px;color:var(--muted)}
.article-note{padding:14px 16px;background:var(--bg-deep);border-left:4px solid var(--steel);border-radius:10px;color:var(--text)}
.related-block{margin-top:30px;padding:24px;background:var(--bg-deep);border:1px solid var(--border);border-radius:16px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.related-link{display:block;padding:15px;background:#fff;border:1px solid var(--border);border-radius:11px;color:var(--ink)}
.related-link:hover{text-decoration:none;border-color:var(--border-strong)}
.related-link strong,.related-link span{display:block}
.related-link span{margin-top:4px;color:var(--muted);font-size:14px}
.page-action{margin-top:30px;padding:22px;border-radius:16px;background:linear-gradient(135deg,#E6EFF7,#DCEBF5);border:1px solid var(--border)}
.page-action h2{margin-bottom:7px}
.policy-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.policy-card{padding:18px;border:1px solid var(--border);border-radius:13px;background:#fff}
details.faq-item{border:1px solid var(--border);border-radius:12px;background:#fff;padding:0 16px}
details.faq-item+details.faq-item{margin-top:10px}
details.faq-item summary{cursor:pointer;list-style:none;padding:16px 38px 16px 0;color:var(--ink);font-weight:800;position:relative}
details.faq-item summary::-webkit-details-marker{display:none}
details.faq-item summary:after{content:"＋";position:absolute;right:0;top:15px;color:var(--steel)}
details.faq-item[open] summary:after{content:"－"}
details.faq-item .faq-answer{padding:0 0 16px;color:var(--text)}
.overlay{position:fixed;inset:0;z-index:70;background:rgba(16,38,58,.42);backdrop-filter:blur(2px)}
.category-panel,.search-dialog{position:fixed;z-index:80;background:#fff;border:1px solid var(--border);box-shadow:0 30px 80px rgba(16,38,58,.22);visibility:hidden;opacity:0;pointer-events:none;transition:opacity .18s ease,transform .18s ease}
.category-panel{left:50%;bottom:18px;transform:translate(-50%,20px);width:min(980px,calc(100% - 36px));max-height:82vh;border-radius:18px;padding:20px;overflow:auto}
.category-panel.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:translate(-50%,0)}
.panel-head,.search-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}
.panel-brand{display:flex;align-items:center;gap:12px}
.panel-brand img{height:30px;width:auto}
.panel-brand span,.search-head span{font-size:12px;color:var(--steel);font-weight:800}
.panel-brand h2,.search-head h2{font-size:22px;margin:0}
.panel-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.panel-grid section{padding:14px;background:var(--bg);border-radius:12px}
.panel-grid section h3{font-size:16px;color:var(--steel)}
.panel-grid a{display:block;padding:9px 0;border-top:1px solid var(--border);color:var(--ink)}
.panel-grid a:hover{text-decoration:none}
.panel-grid a strong,.panel-grid a span{display:block}
.panel-grid a span{font-size:12px;color:var(--muted)}
.search-dialog{left:50%;top:50%;transform:translate(-50%,-47%);width:min(640px,calc(100% - 32px));border-radius:18px;padding:22px}
.search-dialog.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:translate(-50%,-50%)}
.search-field input{width:100%;min-height:52px;border:1px solid var(--border-strong);border-radius:12px;padding:0 14px;background:var(--bg);color:var(--ink)}
.search-hint{color:var(--muted);font-size:14px;margin:9px 0 13px}
.search-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.search-results a{padding:12px 13px;background:var(--bg-deep);border-radius:10px;font-weight:700;color:var(--ink)}
.search-results a:hover{text-decoration:none;background:var(--soft)}
.search-empty{padding:14px;background:var(--bg);border-radius:10px;color:var(--muted)}
.site-footer{background:#1E6FB8;color:#fff}
.footer-inner{max-width:var(--max);margin:0 auto;padding:42px 20px 90px}
.footer-brand{max-width:620px}
.footer-brand img{height:32px;width:auto;margin-bottom:12px;filter:brightness(0) invert(1)}
.footer-brand strong,.footer-brand span{display:block}
.footer-brand strong{font-size:22px}
.footer-brand span{opacity:.75;font-size:13px;letter-spacing:.12em}
.footer-brand p{margin-top:10px;color:rgba(255,255,255,.86)}
.footer-groups{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin-top:28px}
.footer-groups h2{font-size:16px;color:#fff}
.footer-groups a{display:block;color:rgba(255,255,255,.9);padding:3px 0;font-size:14px}
.footer-notice{margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.2);color:rgba(255,255,255,.82);font-size:14px}
.mobile-bottom-nav{display:none}
@media(max-width:1100px){
  .site-shell{grid-template-columns:205px minmax(0,1fr);gap:20px}
  .task-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .board{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:960px){
  .site-shell{grid-template-columns:1fr}
  .category-rail{display:none}
  .panel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
  body{padding-bottom:calc(58px + env(safe-area-inset-bottom))}
  .topbar{height:68px}
  .topbar-inner{padding:0 16px;gap:8px}
  .brand img{height:30px}
  .brand-note,.top-app-link{display:none}
  .top-actions{gap:6px}
  .icon-button,.menu-button{padding:0 12px}
  .site-shell{padding:18px 16px 38px}
  .page-hero,.brand-cover,.section-block,.related-block{padding:18px}
  .task-strip,.article-grid,.tool-grid,.boundary-grid,.split-panel,.policy-grid,.related-grid,.node-row{grid-template-columns:1fr}
  .asym-grid,.channel-band,.channel-band.reverse,.mobile-showcase{grid-template-columns:1fr}
  .channel-band.reverse .media-box{order:0}
  .mosaic{grid-template-columns:1fr}
  .mosaic article,.mosaic article:nth-child(n){grid-column:auto}
  .board{grid-template-columns:1fr}
  .footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}
  .category-panel{bottom:0;width:100%;max-height:82vh;border-radius:18px 18px 0 0;padding:18px}
  .panel-grid{grid-template-columns:1fr}
  .search-results{grid-template-columns:1fr}
  .mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:60;height:calc(58px + env(safe-area-inset-bottom));padding:6px 8px env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);gap:4px;background:rgba(255,255,255,.97);border-top:1px solid var(--border);box-shadow:0 -8px 24px rgba(16,38,58,.08)}
  .mobile-bottom-nav a{display:flex;align-items:center;justify-content:center;min-width:0;border-radius:9px;color:var(--muted);font-size:13px;font-weight:800;white-space:nowrap}
  .mobile-bottom-nav a:hover{text-decoration:none}
  .mobile-bottom-nav a.is-current{background:var(--steel);color:#fff}
  .footer-inner{padding-bottom:104px}
}
@media(max-width:430px){
  .topbar-inner{padding:0 12px}
  .menu-button{font-size:0;width:48px;padding:0}
  .menu-button:after{content:"菜单";font-size:14px}
  .icon-button{font-size:14px;padding:0 10px}
  .page-hero,.brand-cover,.section-block,.related-block{padding:16px}
  .footer-groups{grid-template-columns:1fr 1fr;gap:18px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}