:root{color-scheme:dark;--bg:#080A0D;--surface:#0D1015;--raised:#12161C;--raised2:#171C23;--hover:#1B2129;--title:#F5F7FA;--body:#C7CDD5;--muted:#9098A3;--blue:#5C7CFA;--bright:#6EA8FF;--ice:#8ED8FF;--purple:#7775FF;--line:rgba(255,255,255,.09);--line-strong:rgba(255,255,255,.16)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--bright);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--ice);outline-offset:3px}button{font:inherit;cursor:pointer}p{margin:0 0 17px}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 17px;font-weight:700}h2{font-size:24px}h3{font-size:19px}ul{padding-left:22px}.container{width:min(100% - 48px,1200px);margin-inline:auto;min-width:0}main{min-height:55vh}.site-header{position:sticky;top:0;z-index:30;background:rgba(8,10,13,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.topbar{min-height:68px;display:flex;align-items:center;gap:24px}.brand{flex:0 0 auto;display:flex;align-items:center;gap:8px;max-width:150px}.brand img{display:block;width:auto;max-width:112px;height:auto;max-height:35px;object-fit:contain}.brand-fallback{font-size:14px;font-weight:700;white-space:nowrap;color:var(--title)}.brand:has(img) .brand-fallback{display:none}.primary-nav{display:flex;align-items:center;gap:22px;flex:1;justify-content:flex-end;min-width:0}.primary-nav a{white-space:nowrap;font-size:14px;color:var(--body)}.primary-nav a[aria-current]{color:var(--bright);font-weight:700}.menu-trigger{border:1px solid var(--line-strong);background:var(--raised);color:var(--title);border-radius:9px;padding:8px 16px;white-space:nowrap}.entry-button{background:var(--blue);color:#fff;border-radius:9px;padding:8px 15px;font-size:14px;font-weight:700;white-space:nowrap}.entry-button:hover{background:var(--bright);color:var(--bg);text-decoration:none}.skip-link{position:absolute;left:12px;top:-60px;background:var(--title);color:var(--bg);z-index:99;padding:8px}.skip-link:focus{top:12px}.menu-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:39}.site-menu{position:fixed;top:72px;right:max(24px,calc((100vw - 1200px)/2));width:min(580px,calc(100vw - 48px));max-height:min(75vh,720px);overflow:auto;background:var(--raised);border:1px solid var(--line-strong);border-radius:14px;box-shadow:0 20px 70px rgba(0,0,0,.7);z-index:40}.site-menu[hidden],.menu-overlay[hidden]{display:none!important}.menu-bar{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-bottom:1px solid var(--line)}.menu-close{background:var(--raised2);border:1px solid var(--line-strong);color:var(--title);border-radius:8px;padding:6px 12px}.menu-contents{padding:14px 20px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 26px}.menu-contents h2{font-size:16px;margin-bottom:8px}.menu-contents ul{list-style:none;padding:0;margin:0 0 16px}.menu-contents li{margin:2px 0}.menu-contents a{font-size:14px}.menu-contents a[aria-current]{font-weight:bold;color:var(--ice)}.breadcrumbs{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:13px}.breadcrumbs a{color:var(--muted)}.page-intro{max-width:900px;padding:32px 0 26px}.page-intro h1{font-size:32px}.page-intro p{font-size:17px;max-width:820px}.eyebrow,.kicker{display:block;color:var(--ice);font-size:13px;letter-spacing:.07em;margin-bottom:10px}.channel-links{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin-bottom:36px;font-size:14px}.channel-links span{color:var(--muted)}.channel-links a{display:inline-block;padding:2px 6px;border-radius:5px;background:var(--raised)}.content-page{max-width:810px;margin:0 auto 42px}.content-page p{line-height:1.85}.article-block{margin-bottom:39px}.article-block h2,.term-group h2{padding-bottom:11px;border-bottom:1px solid var(--line);margin-bottom:18px}.note{background:var(--raised2);border-left:3px solid var(--blue);padding:17px 19px;border-radius:0 9px 9px 0;margin:22px 0}.reading-list li{margin-bottom:10px;padding-left:3px}.table-scroll{overflow-x:auto;max-width:100%;margin:22px 0 27px;border:1px solid var(--line);border-radius:11px}table{border-collapse:collapse;min-width:540px;width:100%;font-size:14px}td,th{text-align:left;vertical-align:top;padding:12px 15px;border-bottom:1px solid var(--line)}th{color:var(--title);background:var(--raised2)}tr:last-child td{border-bottom:none}tr:nth-child(2n) td{background:var(--surface)}.media-natural{margin:22px 0 28px;display:grid;place-items:center;min-width:0;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.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-natural figcaption{font-size:13px;color:var(--muted);margin-top:9px;text-align:center}.missing-image{border:1px dashed var(--line-strong);border-radius:8px;min-height:110px;width:100%;display:grid;place-items:center;color:var(--muted);font-size:14px}.related{border-top:1px solid var(--line);padding:29px 0 50px}.related h2{font-size:20px}.related-links{display:flex;gap:12px;flex-wrap:wrap}.related-links a{background:var(--raised);border:1px solid var(--line);padding:8px 14px;border-radius:8px;font-size:14px}.site-footer{background:#050608;border-top:1px solid var(--line)}.foot-grid{padding:32px 0 34px;display:flex;justify-content:space-between;gap:24px}.foot-brand{color:var(--title);font-weight:700}.foot-brand span{color:var(--muted);font-size:12px}.small{font-size:13px;color:var(--muted)}.foot-links{display:flex;gap:15px;flex-wrap:wrap;align-content:start}.foot-links a{font-size:14px}.back-top{position:fixed;right:22px;bottom:22px;border-radius:50%;width:44px;height:44px;border:1px solid var(--line-strong);background:var(--raised2);color:var(--title);z-index:29}.back-top[hidden]{display:none}.home-page{padding-top:35px;padding-bottom:44px}.home-masthead{display:grid;grid-template-columns:minmax(0,2.4fr) minmax(160px,1fr);gap:30px;align-items:end;margin-bottom:30px}.home-masthead h1{font-size:37px;max-width:850px}.home-masthead p{max-width:850px}.masthead-notes{display:flex;flex-direction:column;gap:12px}.masthead-notes span{border-left:2px solid var(--bright);padding:3px 14px;color:var(--title)}.home-page>.media-natural{margin:0 0 42px}.home-section{margin:44px 0}.section-heading{max-width:800px;margin-bottom:22px}.question-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.question-grid article,.feature-main,.feature-aside article,.purpose-grid article{min-width:0;background:var(--surface);border:1px solid var(--line);padding:23px;border-radius:12px}.question-grid article h3{font-size:19px}.question-grid p{font-size:15px}.feature-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);gap:18px}.feature-main{background:var(--raised)}.feature-main h3{font-size:24px}.feature-aside{display:grid;gap:12px}.feature-aside article{padding:16px 20px}.feature-aside h3{font-size:17px;margin-bottom:9px}.feature-aside p{font-size:14px}.selected-images{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.selected-images .media-natural{margin:0}.section-links{margin-top:18px}.rule-strip{border:1px solid var(--line-strong);border-left:4px solid var(--blue);background:var(--raised);border-radius:8px;padding:24px 28px}.path-row{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0}.path-row span{border-bottom:2px solid var(--blue);padding:8px 12px;background:var(--surface)}.service-end{border-top:1px solid var(--line);padding-top:28px}.service-links{display:flex;gap:12px;flex-wrap:wrap}.service-links a{background:var(--raised);padding:9px 13px;border-radius:8px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.image-card .media-natural{margin:0}.image-card .media-natural img{max-height:185px}.bookmark-list{display:grid;gap:12px}.bookmark-list article{border-bottom:1px solid var(--line);padding:12px 0}.bookmark-list h3{margin-bottom:8px}.purpose-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.map-section{margin:22px 0}.map-section li{margin:6px 0}.jump-index{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:28px}.jump-index a{border:1px solid var(--line);padding:7px 12px;border-radius:6px}.term-group{margin:30px 0}.term-group dl{padding:13px 0;border-bottom:1px solid var(--line)}.term-group dt{color:var(--title);font-weight:bold}.term-group dd{margin:7px 0 0}.faq-list details{border-bottom:1px solid var(--line);padding:12px 0}.faq-list summary{cursor:pointer;color:var(--title);font-weight:bold;list-style:revert}.faq-list details p{padding:10px 5px 2px;margin:0}.page-gallery{max-width:850px}.page-categories{max-width:900px}
@media(max-width:1050px){.primary-nav{gap:12px}.topbar{gap:14px}.primary-nav a{font-size:13px}}@media(max-width:980px){.container{width:calc(100% - 40px)}.primary-nav{display:none}.topbar{justify-content:space-between}.brand{margin-right:auto}.site-menu{right:20px}}@media(max-width:640px){.container{width:calc(100% - 32px)}body{font-size:15px}.topbar{min-height:64px;gap:9px}.brand{max-width:96px}.brand img{max-width:96px;max-height:31px}.brand-fallback{font-size:13px}.menu-trigger{min-width:44px;min-height:44px;padding:7px 10px;font-size:14px}.entry-button{font-size:13px;padding:9px 10px}.menu-overlay{z-index:39}.site-menu{top:auto;bottom:0;left:0;right:0;width:100%;max-height:85vh;max-height:85dvh;border-radius:18px 18px 0 0;padding-bottom:env(safe-area-inset-bottom)}.menu-contents{grid-template-columns:minmax(0,1fr);padding:12px 18px}.menu-contents section{border-bottom:1px solid var(--line)}.menu-contents ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 12px}.menu-contents a{display:block;padding:4px 0}.page-intro{padding:23px 0}.page-intro h1{font-size:26px}.page-intro p{font-size:15px}.content-page h2{font-size:21px}.content-page h3{font-size:17px}.channel-links{margin-bottom:28px}.article-block{margin-bottom:28px}.media-natural img{max-height:min(var(--image-max-height,210px),210px)}.home-masthead{grid-template-columns:minmax(0,1fr);gap:12px}.home-masthead h1{font-size:29px}.masthead-notes{flex-direction:row;flex-wrap:wrap;gap:7px}.masthead-notes span{font-size:13px;padding:4px 7px}.home-section{margin:30px 0}.question-grid,.feature-layout,.purpose-grid,.gallery-grid{grid-template-columns:minmax(0,1fr)}.selected-images{grid-template-columns:minmax(0,1fr)}.selected-images .media-natural img{max-height:190px}.feature-main h3{font-size:20px}.foot-grid{display:block}.foot-links{margin-top:17px}.rule-strip{padding:19px}.home-page>.media-natural img{max-height:170px}}@media(max-width:350px){.brand{max-width:80px}.brand img{max-width:80px}.entry-button{padding:8px}.topbar{gap:6px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}