/* 基础 */
:root{--bg:#F5F7F8;--surface:#fff;--soft:#EDEFF1;--blue-soft:#E8EEF2;--warm:#F3E9DF;--navy:#183247;--navy-deep:#102536;--bluegray:#496779;--teal:#3F746F;--copper:#B9653B;--title:#1E2A32;--text:#38454D;--muted:#65727A;--hint:#758189;--border:#D6DDE1;--footer:#132A3A;--footertext:#F3F6F7;--shell:1200px;--read:760px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}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;font-size:16px;line-height:1.82}img{display:block;max-width:100%;height:auto}a{color:var(--bluegray);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--copper);text-decoration-thickness:2px}a:focus-visible,button:focus-visible{outline:3px solid rgba(185,101,59,.45);outline-offset:3px}button{font:inherit}.skip-link{position:absolute;left:16px;top:-70px;z-index:100;background:#fff;color:var(--navy);padding:10px 14px;border:1px solid var(--border);border-radius:8px}.skip-link:focus{top:10px}.shell{width:100%;max-width:var(--shell);margin:0 auto;padding-left:34px;padding-right:34px}.read-col{width:100%;max-width:var(--read);margin-left:auto;margin-right:auto}.narrow-col{width:100%;max-width:680px;margin-left:auto;margin-right:auto}h1,h2,h3{color:var(--title);margin-top:0}h1{font-size:36px;line-height:1.25;letter-spacing:-.02em}h2{font-size:26px;line-height:1.35}h3{font-size:20px;line-height:1.45}p{margin:0 0 1.15em}ul,ol{padding-left:1.4em}li+li{margin-top:.45em}.eyebrow{font-size:14px;letter-spacing:.08em;color:var(--copper);font-weight:700}.muted{color:var(--muted)}.tagline{font-size:15px;color:var(--teal);font-weight:700}.section-link{display:inline-block;margin-top:8px;font-weight:700}.text-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 15px;border-radius:8px;border:1px solid var(--navy);background:var(--navy);color:#fff;text-decoration:none;font-size:15px}.text-button.secondary{background:transparent;color:var(--navy)}.text-button:hover{background:var(--copper);border-color:var(--copper);color:#fff}.link-row{display:flex;gap:10px;flex-wrap:wrap}.prose a{font-weight:600}.media-frame{min-width:0}.mt-28{margin-top:28px}.media-frame img{object-fit:contain;border:1px solid var(--border);border-radius:10px;background:#fff}.caption{font-size:14px;line-height:1.65;color:var(--muted);margin-top:9px}.rule-title{display:flex;gap:12px;align-items:baseline}.rule-title::before{content:"";width:28px;height:2px;background:var(--copper);flex:0 0 auto}
/* 布局 */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:relative;z-index:20}.header-inner{min-height:70px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:10px;color:var(--navy);text-decoration:none;min-width:0;margin-right:auto}.brand-logo{height:32px;width:auto;max-width:170px}.brand-mark{display:grid;place-items:center;width:38px;height:32px;border-radius:8px;background:var(--navy);color:#fff;font-size:13px;font-weight:700}.brand-copy{display:flex;flex-direction:column;line-height:1.15;white-space:nowrap}.brand-copy strong{font-size:17px}.brand-copy small{font-size:10px;letter-spacing:.08em;margin-top:4px;color:var(--muted)}.primary-nav{display:flex;align-items:center;gap:18px}.primary-nav a,.header-actions a{font-size:15px;color:var(--text);text-decoration:none;white-space:nowrap}.primary-nav a:hover,.header-actions a:hover,.primary-nav .is-current,.header-actions .is-current{color:var(--copper)}.header-actions{display:flex;align-items:center;gap:10px}.menu-toggle,.menu-close{min-height:44px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--navy);padding:8px 13px;cursor:pointer}.route-link{min-height:44px;display:inline-flex;align-items:center}.category-panel{border-top:1px solid var(--border);background:var(--blue-soft)}.category-inner{padding-top:22px;padding-bottom:24px}.category-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.category-head strong{color:var(--navy)}.desktop-categories{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.desktop-categories section,.mobile-categories section{min-width:0}.desktop-categories h2,.mobile-categories h2{font-size:15px;margin:0 0 8px;color:var(--navy)}.desktop-categories a{display:block;padding:6px 0;color:var(--title);text-decoration:none}.desktop-categories a span{display:block;font-size:13px;color:var(--muted)}.service-strip{display:flex;gap:14px;flex-wrap:wrap;border-top:1px solid var(--border);margin-top:18px;padding-top:14px}.service-strip a{font-size:13px}.mobile-categories{display:none}main{min-height:60vh}.page-hero{padding:46px 0 32px}.crumb{font-size:14px;color:var(--muted);margin-bottom:14px}.crumb a{color:var(--muted)}.page-hero h1{margin-bottom:12px}.page-hero .lead{max-width:780px;font-size:17px;line-height:1.72;color:var(--text)}.content-section{padding:54px 0}.content-section.compact{padding:38px 0}.soft-bg{background:var(--soft)}.blue-bg{background:var(--blue-soft)}.warm-bg{background:var(--warm)}.two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:38px;align-items:start}.two-col.wide-media{grid-template-columns:minmax(0,.78fr) minmax(0,1.22fr)}.two-col.media-narrow{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr)}.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.split-rail{display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr);gap:44px}.rail{border-left:2px solid var(--border);padding-left:18px}.rail .step{padding:4px 0 19px;font-weight:700;color:var(--navy)}.article-block+.article-block{margin-top:42px}.inline-note{border-left:3px solid var(--teal);padding-left:16px;color:var(--muted)}.number-line{counter-reset:item}.number-line>div{position:relative;padding:0 0 28px 58px;min-width:0}.number-line>div::before{counter-increment:item;content:counter(item,decimal-leading-zero);position:absolute;left:0;top:0;color:var(--copper);font-weight:800;font-size:14px}.number-line>div::after{content:"";position:absolute;left:18px;top:26px;bottom:5px;width:1px;background:var(--border)}.number-line>div:last-child::after{display:none}.text-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 30px}.text-index a{display:block;padding:13px 0;border-top:1px solid var(--border);text-decoration:none}.callout{padding:20px 24px;border-radius:12px;background:#fff;border:1px solid var(--border)}.dark-panel{background:var(--navy);color:#edf4f5;border-radius:14px;padding:28px}.dark-panel h2,.dark-panel h3,.dark-panel a{color:#fff}.dark-panel p{color:#edf4f5}.dark-panel img{border-color:rgba(255,255,255,.25);background:transparent}.site-footer{background:var(--footer);color:var(--footertext);padding:54px 0 22px;margin-top:60px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,minmax(0,1fr));gap:34px}.site-footer h2{font-size:16px;color:#fff;margin-bottom:12px}.site-footer p{font-size:14px;line-height:1.7;color:#dbe5e8}.site-footer a{display:block;color:#f3f6f7;font-size:14px;padding:4px 0}.footer-bottom{border-top:1px solid rgba(255,255,255,.14);margin-top:28px;padding-top:18px;font-size:13px;color:#c8d5da}.mobile-bottom{display:none}
/* 页面 */
.home-opening{padding:54px 0 34px}.opening-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,390px);gap:42px;align-items:center}.opening-grid h1{margin-bottom:16px}.opening-grid .intro{font-size:17px;line-height:1.78;max-width:700px}.opening-grid .media-frame img{max-height:280px;margin-left:auto}.reading-line{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.reading-line div{padding:20px 16px;min-width:0;border-right:1px solid var(--border)}.reading-line div:last-child{border-right:0}.reading-line strong{display:block;color:var(--copper);font-size:13px;margin-bottom:7px}.reading-line h3{font-size:17px;margin-bottom:8px}.genre-terms{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px 24px;margin-top:24px}.genre-terms div{border-top:1px solid var(--border);padding-top:12px}.genre-terms strong{color:var(--navy)}.relation-track{border-left:2px solid var(--teal);padding-left:18px}.relation-track span{display:block;padding:8px 0;color:var(--navy);font-weight:700}.analysis-trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-top:22px}.analysis-trio div{border-top:2px solid var(--copper);padding-top:12px}.visual-layout{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.35fr);gap:34px;align-items:center}.visual-layout img{max-height:310px}.stacked-media{display:grid;gap:30px}.stacked-media .media-frame{max-width:520px}.location-mag{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:34px}.location-notes>div{padding:0 0 18px;margin-bottom:18px;border-bottom:1px solid var(--border)}.case-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:30px}.case-small article+article{margin-top:24px;padding-top:24px;border-top:1px solid var(--border)}.topic-list article{padding:18px 0;border-top:1px solid var(--border)}.route-stage{display:grid;grid-template-columns:minmax(0,90px) minmax(0,1fr);gap:22px;padding:28px 0;border-top:1px solid var(--border)}.route-stage .num{font-size:14px;color:var(--copper);font-weight:800}.faq-item{padding:0 0 26px;margin-bottom:26px;border-bottom:1px solid var(--border)}.faq-item h2{font-size:20px}.terms section{padding:22px 0;border-top:1px solid var(--border)}.timeline{border-left:2px solid var(--border);padding-left:24px}.timeline article{position:relative;padding:0 0 26px}.timeline article::before{content:"";position:absolute;left:-30px;top:8px;width:10px;height:10px;border-radius:50%;background:var(--copper)}.side-notes{font-size:14px;color:var(--muted)}.side-notes div{padding:10px 0;border-top:1px solid var(--border)}.image-regular img{max-height:260px}.image-small img{max-height:220px}.image-device img{max-width:250px;max-height:390px;margin:auto}.image-opening img{max-width:390px;max-height:280px}.image-ai img{max-height:300px}.image-visual img{max-width:520px;max-height:310px}.image-brief img{max-width:330px;max-height:230px}
/* 响应式 */
@media(max-width:1024px){.shell{padding-left:24px;padding-right:24px}.primary-nav{gap:12px}.primary-nav a:nth-child(4),.primary-nav a:nth-child(6){display:none}.header-inner{gap:14px}.reading-line{grid-template-columns:repeat(3,minmax(0,1fr))}.reading-line div:nth-child(3){border-right:0}.reading-line div:nth-child(n+4){border-top:1px solid var(--border)}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:767px){body{padding-bottom:calc(62px + env(safe-area-inset-bottom));font-size:16px;line-height:1.8}.shell{padding-left:16px;padding-right:16px}.header-inner{min-height:60px}.brand-logo{height:27px;max-width:145px}.brand-mark{width:34px;height:29px}.brand-copy small{display:none}.brand-copy strong{font-size:16px}.primary-nav,.route-link{display:none}.header-actions{margin-left:auto}.desktop-categories,.service-strip{display:none}.mobile-categories{display:grid;grid-template-columns:1fr;gap:18px}.mobile-categories section{border-top:1px solid var(--border);padding-top:10px}.mobile-categories a{display:block;min-height:40px;padding:7px 0;color:var(--title);text-decoration:none}.category-inner{padding-top:14px;padding-bottom:18px}.page-hero{padding:34px 0 24px}.page-hero .lead{font-size:16px}.content-section{padding:40px 0}.content-section.compact{padding:32px 0}h1{font-size:28px;line-height:1.35}h2{font-size:22px;line-height:1.4}h3{font-size:18px;line-height:1.5}.two-col,.two-col.wide-media,.two-col.media-narrow,.three-col,.split-rail,.visual-layout,.location-mag,.case-layout,.opening-grid,.footer-grid{grid-template-columns:minmax(0,1fr);gap:26px}.two-col>* ,.three-col>*,.split-rail>*,.visual-layout>*,.location-mag>*,.case-layout>*,.opening-grid>*{grid-column:auto!important;grid-row:auto!important;grid-area:auto!important;min-width:0;width:auto;position:static}.rail{border-left:0;border-top:2px solid var(--border);padding-left:0;padding-top:12px}.home-opening{padding:38px 0 24px}.opening-grid .media-frame img{max-height:210px;margin:0}.reading-line{grid-template-columns:minmax(0,1fr);border-bottom:0}.reading-line div{border-right:0;border-bottom:1px solid var(--border)!important}.genre-terms,.analysis-trio,.text-index{grid-template-columns:minmax(0,1fr)}.relation-track{display:flex;gap:8px;flex-wrap:wrap;border-left:0;padding-left:0}.relation-track span{font-size:14px;padding:6px 9px;border:1px solid var(--border);border-radius:8px;background:#fff}.number-line>div{padding-left:0;padding-top:35px}.number-line>div::before{left:0;top:0;border:1px solid var(--border);padding:2px 8px;border-radius:6px}.number-line>div::after{display:none}.route-stage{grid-template-columns:minmax(0,1fr);gap:7px}.dark-panel{padding:20px 18px}.image-device img{max-width:190px;max-height:300px}.image-opening img{max-width:100%;max-height:210px}.image-ai img,.image-visual img,.image-regular img{max-height:210px}.image-brief img,.image-small img{max-height:190px}.site-footer{padding:42px 0 28px;margin-top:42px}.footer-grid{gap:26px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:40;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));min-height:58px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:12px;color:var(--text);text-decoration:none}.mobile-bottom .is-current{color:var(--copper);font-weight:800}}
@media(min-width:390px) and (max-width:767px){.mobile-categories{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 24px}}
@media(max-width:360px){.mobile-categories{grid-template-columns:minmax(0,1fr)}.shell{padding-left:14px;padding-right:14px}.brand-copy strong{font-size:15px}.menu-toggle{padding-left:10px;padding-right:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}