:root{color-scheme:dark;--bg:#080A0D;--header:rgba(8,10,13,.96);--panel:#0D1015;--soft:#12161C;--raised:#171C23;--hover:#1B2129;--title:#F5F7FA;--body:#C7CDD5;--muted:#9098A3;--blue:#5C7CFA;--bright:#6EA8FF;--ice:#8ED8FF;--purple:#7775FF;--border:rgba(255,255,255,.09);--strong-border:rgba(255,255,255,.16)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--body);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}a{color:var(--bright);text-decoration:none}a:hover{text-decoration:underline;color:var(--ice)}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible{outline:3px solid var(--ice);outline-offset:3px;border-radius:4px}h1,h2,h3{line-height:1.4;color:var(--title);margin:0 0 16px}h1{font-size:32px}h2{font-size:24px}h3{font-size:19px}p{margin:0 0 17px}small{font-size:13px}.container{max-width:1200px;margin:0 auto;padding:0 24px;min-width:0}.site-header{position:sticky;top:0;z-index:50;background:var(--header);border-bottom:1px solid var(--border);backdrop-filter:blur(8px)}.header-inner{height:68px;max-width:1200px;padding:0 24px;margin:auto;display:flex;align-items:center;gap:20px;min-width:0}.brand{display:flex;align-items:center;min-width:100px;flex:none}.brand img{display:block;max-width:108px;max-height:34px;width:auto;height:auto;object-fit:contain}.brand-fallback{font-size:22px;font-weight:800;color:var(--title)}.desktop-nav{display:flex;align-items:center;justify-content:flex-end;gap:18px;margin-left:auto;white-space:nowrap;min-width:0}.desktop-nav>a,.menu-trigger{font-size:14px;color:var(--body)}.desktop-nav a[aria-current]{color:var(--bright);font-weight:bold;border-bottom:2px solid var(--blue);padding:20px 0}.menu-trigger{border:0;background:transparent;padding:10px 4px}.entry-button{background:var(--blue);color:#fff;padding:8px 13px;border-radius:8px;font-weight:700;white-space:nowrap;font-size:14px;flex:none}.entry-button:hover{background:var(--bright);color:var(--bg);text-decoration:none}.mobile-trigger{display:none}.desktop-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:min(1120px,calc(100% - 40px));max-height:min(70vh,640px);overflow:auto;background:var(--soft);border:1px solid var(--strong-border);border-radius:0 0 14px 14px;box-shadow:0 20px 44px #0009}.desktop-menu[hidden],.mobile-menu[hidden],.mobile-overlay[hidden],.back-to-top[hidden]{display:none!important}.menu-content{padding:20px}.menu-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.all-group-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.all-group{background:var(--panel);border:1px solid var(--border);padding:16px;border-radius:10px;min-width:0}.all-group h3{font-size:17px;margin-bottom:8px}.all-group ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}.all-group li a{display:block;padding:3px 2px;font-size:14px}.mobile-menu,.mobile-overlay{display:none}.skip-link{position:fixed;top:-100px;left:20px;z-index:100;background:var(--blue);color:white;padding:9px}.skip-link:focus{top:8px}.site-main{min-height:65vh}.noscript-access{text-align:right;font-size:13px;padding-top:6px}.page-head{max-width:820px;margin:20px 0 18px}.page-head h1{font-size:32px}.lead{font-size:17px;line-height:1.83;color:var(--body)}.eyebrow{font-size:13px;color:var(--bright);letter-spacing:.04em;font-weight:700}.breadcrumbs{display:flex;gap:10px;font-size:13px;color:var(--muted);padding-top:18px}.breadcrumbs a{color:var(--muted)}.channel-nav{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 30px;padding-bottom:18px;border-bottom:1px solid var(--border)}.channel-nav a{padding:5px 12px;font-size:14px;background:var(--soft);border-radius:18px}.channel-nav a[aria-current]{background:var(--blue);color:white}.page-body{margin:0 auto 38px}.page-body p,.page-body li{max-width:820px}.prose-block,.essay>section{max-width:820px;margin:0 0 32px}.prose-block h2{border-left:3px solid var(--blue);padding-left:14px}.note{padding:20px 24px;max-width:820px;border:1px solid var(--strong-border);border-left:4px solid var(--bright);background:var(--soft);margin:24px 0}.note h3{font-size:18px}.table-wrap{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;border:1px solid var(--border);border-radius:10px;margin:20px 0 32px}table{border-collapse:collapse;width:100%;min-width:570px}th,td{border-bottom:1px solid var(--border);text-align:left;padding:12px 14px;font-size:14px;vertical-align:top}th{color:var(--title);background:var(--raised)}td{background:var(--panel)}caption{text-align:left;padding:10px;color:var(--muted);font-size:13px}.checklist{padding-left:20px}.related{margin:42px 0;border-top:1px solid var(--border);padding-top:22px}.related h2{font-size:22px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.related-grid a{min-width:0;padding:18px;background:var(--soft);border:1px solid var(--border);border-radius:12px;display:flex;flex-direction:column;gap:4px;text-decoration:none}.related-grid a:hover{border-color:var(--blue)}.related-grid span{color:var(--muted);font-size:13px}.related-grid strong{color:var(--title);font-size:18px}.related-grid small{color:var(--body);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.media-object,.media-placeholder{margin:20px 0 28px;max-width:100%;min-width:0}.media-natural{display:grid;place-items:center;min-width:0;padding:8px;border-radius:12px;background:#0D1015}.media-natural>img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--image-max-height,280px);object-fit:contain;object-position:center}.media-object figcaption,.media-placeholder figcaption{margin-top:9px;color:var(--muted);font-size:13px;line-height:1.65}.media-placeholder>div{display:grid;place-items:center;min-height:130px;color:var(--muted);font-size:14px;border:1px dashed var(--strong-border);background:var(--panel);border-radius:12px}.article-media{max-width:780px}.home-poster{--image-max-height:260px;margin:0 0 44px}.home-poster .media-natural{padding:8px}.home-poster img{max-height:260px!important}.home-poster figcaption{font-size:12px}.catalog-media{--image-max-height:185px}.catalog-media .media-natural{min-height:155px}.study-media{--image-max-height:420px}.study-media img{max-height:420px!important}.phone-media{--image-max-height:360px}.phone-media img{max-height:360px!important}.gif-media{--image-max-height:185px}.gif-media img{max-height:185px!important}.home-image{--image-max-height:210px}.home-image img{max-height:210px!important}.site-footer{background:#050608;border-top:1px solid var(--border);padding:38px 0}.footer-inner{display:flex;justify-content:space-between;gap:30px}.footer-brand{font-size:19px;font-weight:800;color:var(--title)}.footer-brand span{display:block;color:var(--muted);font-size:11px;font-weight:400}.footer-inner p{font-size:13px;max-width:650px;margin:6px 0}.disclaimer{color:var(--muted)}.footer-inner nav{display:flex;gap:10px 18px;flex-wrap:wrap;align-content:start;max-width:340px}.footer-inner nav a{font-size:13px}.back-to-top{position:fixed;right:18px;bottom:22px;background:var(--blue);color:white;border:0;border-radius:50%;width:44px;height:44px;font-size:24px;z-index:35}.home-masthead{display:grid;grid-template-columns:minmax(0,2fr) minmax(190px,1fr);gap:30px;align-items:end;padding:30px 0 28px}.home-masthead h1{font-size:37px;max-width:800px}.home-masthead .lead{max-width:760px}.masthead-hints{display:flex;flex-direction:column;gap:10px}.masthead-hints span{border-left:2px solid var(--blue);padding:10px 16px;background:var(--soft);font-size:15px}.home-section{margin:38px 0 46px}.section-head{margin-bottom:20px}.section-head h2{font-size:25px}.question-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.question-grid article{background:var(--soft);border:1px solid var(--border);padding:22px;border-radius:10px}.question-grid h3{font-size:19px}.question-grid p{font-size:15px}.editor-pick{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:20px}.primary-pick{padding:26px;background:var(--raised);border-top:3px solid var(--blue);border-radius:8px}.primary-pick h3{font-size:25px}.secondary-picks{display:grid;gap:12px}.secondary-picks article{background:var(--soft);border:1px solid var(--border);border-radius:10px;padding:14px 18px}.secondary-picks h3{font-size:17px;margin:0 0 5px}.secondary-picks p{font-size:14px;margin:0 0 5px}.home-images{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.home-images>figure{min-width:0;margin:0;background:var(--soft);padding:10px;border-radius:10px}.home-images figure .media-object{margin:0}.home-images figcaption{font-size:13px;color:var(--muted)}.inline-links,.three-routes{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}.inline-links a,.three-routes a{background:var(--soft);padding:8px 14px;border:1px solid var(--border);border-radius:8px}.rule-band{background:var(--soft);border-top:1px solid var(--strong-border);border-bottom:1px solid var(--strong-border);padding:22px 26px;display:grid;grid-template-columns:minmax(0,2fr) minmax(180px,1fr);gap:20px}.rule-band>div:last-child{display:grid;align-content:center;gap:10px}.section-intro{max-width:840px}.home-service{margin:38px 0;padding:23px 25px;background:var(--panel);border-radius:12px}.home-service p{max-width:780px}.home-service nav{display:flex;flex-wrap:wrap;gap:15px}.longread{max-width:820px}.timeline{max-width:850px;padding-left:28px;border-left:2px solid var(--blue);list-style:decimal}.timeline li{padding:0 0 20px 13px}.timeline li::marker{color:var(--bright);font-size:20px}.feature-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(0,1fr);gap:24px;align-items:start}.panel{background:var(--soft);padding:20px;border-radius:12px;border:1px solid var(--border)}.panel p{font-size:14px}.jump-index{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.jump-index a{padding:6px 12px;background:var(--soft);border-radius:8px;font-size:14px}.glossary{max-width:820px}.glossary dt{font-weight:bold;color:var(--title);margin-top:20px}.glossary dd{margin:4px 0 14px;padding-bottom:14px;border-bottom:1px solid var(--border)}.observation-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:30px}.observation-strip>div{background:var(--soft);padding:20px;border-radius:10px}.observation-strip h2{font-size:20px}.compare-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.compare-columns section{background:var(--soft);padding:24px;border-radius:10px}.catalog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.catalog-item{min-width:0;background:var(--soft);padding:14px;border-radius:12px;border:1px solid var(--border)}.catalog-item h3{font-size:18px}.catalog-item h3 small{color:var(--muted);font-weight:normal}.catalog-item .media-object{margin:0}.catalog-item p{color:var(--muted);font-size:13px}.gallery-study{max-width:840px}.gallery-study>section{margin-bottom:36px;padding-bottom:24px;border-bottom:1px solid var(--border)}.reading-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.reading-list article{background:var(--soft);border-left:2px solid var(--blue);padding:19px}.reading-list h2{font-size:20px;margin:7px 0}.reading-list p{font-size:15px}.thesis{background:var(--raised);padding:25px;border-left:4px solid var(--blue);margin-bottom:20px;max-width:940px}.paths{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.paths section{min-width:0;background:var(--soft);padding:20px;border-radius:10px}.paths span{font-size:13px;color:var(--bright)}.paths h2{font-size:21px;margin-top:12px}.paths p{font-size:15px}.mechanism{max-width:910px}.mechanism>section{margin:24px 0}.process-diagram{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--soft);padding:20px;border-radius:12px}.process-diagram div{background:var(--raised);padding:8px 12px;border-radius:8px}.map-purposes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.map-purposes section{padding:18px;background:var(--soft);border:1px solid var(--border);border-radius:10px}.map-purposes h2{font-size:20px}.all-sections{margin-top:32px}.mobile-guide{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:24px}.steps{padding-left:24px}.steps li{margin-bottom:18px}.risk-scenarios,.diagnostics,.faq-stack{max-width:860px}.risk-scenarios section,.diagnostics section,.faq-stack section{border-bottom:1px solid var(--border);padding:19px 0}.risk-scenarios h2,.diagnostics h2,.faq-stack h2{font-size:21px}.boundary-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.boundary-points section{background:var(--soft);padding:22px;border-top:2px solid var(--blue)}.boundary-points h2{font-size:21px}
@media(max-width:1040px){.desktop-nav{display:none}.mobile-trigger{display:block;margin-left:auto;font-size:15px;padding:9px;min-width:44px;min-height:44px}.brand{min-width:0}.header-inner{gap:10px}.mobile-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.68);z-index:80}.mobile-menu{display:flex;flex-direction:column;position:fixed;bottom:0;left:0;right:0;max-height:85vh;max-height:85dvh;z-index:90;background:var(--soft);border-radius:18px 18px 0 0;border:1px solid var(--strong-border);padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -16px 45px #0009}.mobile-menu-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--border)}.mobile-menu-head button{color:var(--title);background:var(--raised);border:1px solid var(--strong-border);padding:7px 12px;border-radius:8px}.mobile-menu-scroll{padding:14px 18px 22px;overflow-y:auto;overscroll-behavior:contain}.mobile-menu .all-group-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.all-link{display:block;padding:9px 0;margin-bottom:12px}.menu-open{overflow:hidden}}
@media(max-width:768px){.container{padding:0 20px}.header-inner{padding:0 20px}.home-masthead{grid-template-columns:1fr;gap:14px}.masthead-hints{flex-direction:row;flex-wrap:wrap}.home-masthead h1{font-size:30px}.page-head h1{font-size:28px}.editor-pick,.feature-layout,.mobile-guide{grid-template-columns:1fr}.related-grid,.catalog-grid,.observation-strip,.home-images,.paths{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-inner{flex-direction:column}.home-poster{--image-max-height:200px}.home-poster img{max-height:200px!important}}
@media(max-width:520px){body{font-size:15px}.container{padding:0 16px}.header-inner{padding:0 16px;height:66px}.brand img{max-width:96px;max-height:33px}.entry-button{font-size:14px;padding:8px 10px}.home-masthead h1{font-size:28px}.page-head h1{font-size:26px}h2{font-size:21px}h3{font-size:18px}.lead{font-size:16px}.home-section{margin:28px 0 32px}.question-grid,.related-grid,.catalog-grid,.observation-strip,.home-images,.paths,.map-purposes,.compare-columns,.reading-list,.boundary-points,.rule-band{grid-template-columns:1fr}.mobile-menu .all-group-grid{grid-template-columns:1fr}.home-images figure{max-width:100%}.home-poster{--image-max-height:170px}.home-poster img{max-height:170px!important}.catalog-media{--image-max-height:165px}.catalog-media img{max-height:165px!important}.phone-media{--image-max-height:280px}.phone-media img{max-height:280px!important}.gif-media{--image-max-height:150px}.gif-media img{max-height:150px!important}.article-media{--image-max-height:210px}.article-media img{max-height:210px!important}.rule-band{padding:20px}.process-diagram{gap:6px}.process-diagram div{font-size:12px;padding:6px}.site-footer{padding:26px 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

.media-object img[role="button"]{cursor:zoom-in}.image-dialog{border:1px solid var(--strong-border);border-radius:12px;background:var(--panel);padding:16px;max-width:min(94vw,1100px);max-height:92vh;overflow:auto;color:var(--title)}.image-dialog::backdrop{background:rgba(0,0,0,.86)}.image-dialog img{display:block;max-width:100%;max-height:78vh;width:auto;height:auto;object-fit:contain;margin:auto}.image-close{display:block;margin:0 0 12px auto;padding:7px 13px;color:white;background:var(--blue);border:0;border-radius:7px}