/* PG电子 · editorial responsive system */
:root{color-scheme:dark;--bg:#080A0D;--panel:#0D1015;--surface:#12161C;--surface2:#171C23;--text:#F5F7FA;--copy:#C7CDD5;--muted:#9098A3;--blue:#5C7CFA;--bright:#6EA8FF;--ice:#8ED8FF;--line:rgba(255,255,255,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--copy);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover{color:var(--bright)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--ice);outline-offset:4px}button{font:inherit;cursor:pointer}.shell{width:min(1200px,calc(100% - 48px));margin-inline:auto;min-width:0}p{margin:0 0 17px}h1,h2,h3{color:var(--text);line-height:1.37;letter-spacing:.01em}h1{font-size:clamp(32px,3vw,35px);margin:0 0 22px}h2{font-size:26px;margin:0 0 20px}h3{font-size:19px;margin:0 0 12px}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--ice);text-transform:uppercase}.muted{color:var(--muted)}.skip-link{position:absolute;left:8px;top:-80px;z-index:100;background:var(--blue);padding:10px}.skip-link:focus{top:8px}
.site-header{position:relative;z-index:30}.topbar{background:rgba(8,10,13,.96);border-bottom:1px solid var(--line)}.topbar-inner{height:76px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:9px;flex:0 0 220px;min-width:0}.brand .visual{border:0;padding:0;background:transparent;margin:0;max-width:125px}.brand .visual img{max-height:36px;width:auto;object-fit:contain}.brand-note{color:var(--muted);font-size:9px;line-height:1.3;letter-spacing:.04em;white-space:normal}.primary-nav{flex:1;display:flex;justify-content:center;gap:clamp(12px,1.45vw,24px);min-width:0}.primary-nav a{font-size:14px;white-space:nowrap;align-self:stretch;display:flex;align-items:center;border-bottom:2px solid transparent}.primary-nav .is-current{color:var(--bright);border-color:var(--bright)}.enter-button{color:#fff;background:var(--blue);border-radius:99px;min-width:103px;height:42px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}.enter-button:hover{background:#7390FF;color:white}.menu-toggle{display:none;border:0;background:transparent;width:40px;height:40px;padding:10px;flex-shrink:0}.menu-toggle span{display:block;background:var(--text);height:2px;margin:4px 0;border-radius:2px}.topicbar{background:#10141A;border-bottom:1px solid var(--line)}.topicbar-inner{height:44px;display:flex;align-items:center;gap:30px;font-size:13px}.topicbar-inner a{white-space:nowrap}.mobile-topics{display:none}.breadcrumbs{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;padding:25px 0 16px;flex-wrap:wrap}.breadcrumbs a{color:var(--copy)}
.main-content{padding-bottom:70px;min-height:65vh}.page-intro{max-width:875px;margin:12px 0 38px}.page-intro .dek{font-size:17px;line-height:1.85;max-width:800px}.page-layout{display:grid;grid-template-columns:minmax(0,1fr) 236px;gap:65px;align-items:start}.article{max-width:820px;min-width:0}.chapter{margin:0 0 48px;scroll-margin-top:20px}.chapter h2{border-top:1px solid var(--line);padding-top:18px}.chapter p{line-height:1.84}.chapter:nth-child(3n+2){padding-left:22px;border-left:2px solid rgba(110,168,255,.3)}.side-index{position:sticky;top:22px;background:var(--panel);border:1px solid var(--line);padding:22px;border-radius:13px}.side-index h2{font-size:17px}.side-index a{display:block;padding:6px 0;font-size:13px;color:var(--copy)}.side-index a:hover{color:var(--bright)}.related{margin:36px 0 15px;border-top:1px solid var(--line);padding-top:21px}.related h2{font-size:21px}.related-links{display:flex;gap:10px;flex-wrap:wrap}.related-link,.text-link{display:inline-block;border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:7px 15px;font-size:13px}.related-link:hover,.text-link:hover{border-color:var(--bright)}.chapter-num{display:inline-block;color:var(--ice);font-size:12px;letter-spacing:.14em;margin-bottom:9px}.editor-note{margin:30px 0;padding:18px 23px;border-left:3px solid var(--blue);background:var(--panel);font-size:14px}.editor-note strong{color:var(--text)}.visual{min-width:0;max-width:100%;margin:0;background:var(--panel);border:1px solid var(--line);border-radius:13px;overflow:hidden;padding:10px;display:flex;align-items:center;justify-content:center}.visual img{max-width:100%;height:auto;width:auto;object-fit:contain;object-position:center center}.visual--hero{height:290px}.visual--hero img{max-height:100%}.visual--feature{min-height:190px;max-height:245px}.visual--feature img{max-height:222px}.visual--standard{min-height:148px;max-height:190px}.visual--standard img{max-height:172px}.visual--device{width:270px;max-width:100%;max-height:340px;min-height:220px}.visual--device img{max-height:320px}.visual--gif{height:164px}.visual--gif img{max-height:145px}.visual--logo{border:0;padding:0;background:transparent;display:inline-flex}.visual--logo img{max-height:36px;object-fit:contain}.image-placeholder{width:100%;height:100%;min-height:112px;background:linear-gradient(135deg,#141A23,#0D1015 58%,#1A2230);border:1px dashed rgba(255,255,255,.07);border-radius:8px}.visual--logo .image-placeholder{min-height:28px;width:85px}.image-caption{color:var(--muted);font-size:13px;margin-top:10px;line-height:1.6}.image-story{margin:28px 0 34px}.image-story .visual{margin-bottom:8px}.inline-media{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:32px;align-items:center;margin:35px 0}.inline-media>*{min-width:0}.inline-media.flip{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr)}.mini-label{font-size:12px;color:var(--ice);letter-spacing:.1em}.number-list{list-style:none;counter-reset:sections;padding:0}.number-list li{counter-increment:sections;border-bottom:1px solid var(--line);padding:18px 0}.number-list li:before{content:counter(sections,decimal-leading-zero);color:var(--ice);font-size:13px;margin-right:15px}
/* Homepage: intentionally varied editorial layouts */
.home-hero{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);align-items:center;gap:35px;margin:29px 0 55px}.home-hero h1{font-size:clamp(38px,3.4vw,42px)}.home-hero .lead{font-size:17px;line-height:1.85}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.home-section{margin:0 0 58px}.section-head{display:flex;gap:20px;align-items:center;margin-bottom:22px}.section-head .section-id{font-size:13px;color:var(--ice)}.section-head h2{margin:0}.interest-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.interest-card{padding:24px;border:1px solid var(--line);border-radius:13px;background:var(--panel)}.interest-card h3{margin-bottom:7px}.interest-card p{font-size:15px;margin-bottom:10px}.article-feature{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,.8fr);gap:50px}.article-feature .aside-notes{border-left:1px solid var(--line);padding-left:25px}.aside-notes a{display:block;border-bottom:1px solid var(--line);padding:15px 0}.aside-notes small{display:block;color:var(--muted);font-size:12px}.twin-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:38px}.twin-columns>article{padding-top:18px;border-top:2px solid rgba(110,168,255,.35)}.question-panel{background:var(--panel);border:1px solid var(--line);padding:24px;border-radius:13px}.figure-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.figure-grid>div{min-width:0}.figure-grid p{font-size:14px;margin:9px 0 0}.magazine-feature{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:30px;align-items:center}.visual-notes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.visual-notes .visual{min-height:140px}.visual-notes p{font-size:13px;margin:9px 0}.index-rows{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 38px}.index-rows article{border-top:1px solid var(--line);padding:21px 0}.index-rows p{font-size:14px}.mobile-feature{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,.6fr);gap:30px;align-items:center}.disclaimer-band{background:var(--panel);padding:25px;border:1px solid var(--line);border-radius:13px}
/* Special pages */
.compare-table{width:100%;border-collapse:collapse;margin:28px 0 34px;font-size:14px}.compare-table th,.compare-table td{padding:14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.compare-table th{color:var(--text);background:#171C23}.sequence{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:26px 0}.sequence div{border-top:2px solid var(--blue);padding:16px;background:var(--panel)}.sequence strong{color:var(--text)}.news-item{padding:22px 0;border-top:1px solid var(--line)}.news-item h2{font-size:21px;margin:5px 0 12px}.news-item p{max-width:880px}.news-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:55px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px}.gallery-grid .visual{max-height:300px;min-height:165px}.gallery-grid .visual img{max-height:278px}.gallery-grid>*:nth-child(3n+1){grid-column:span 2}.gallery-grid>*:nth-child(3n+1) .visual{max-height:260px}.art-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:24px 0 45px}.art-grid figure{margin:0}.art-grid .visual{min-height:155px;max-height:205px}.art-grid .visual img{max-height:184px}.art-grid h3{font-size:18px;margin:12px 0 5px}.art-grid p{font-size:14px}.map-group{padding:23px 0;border-top:1px solid var(--line)}.map-group p{max-width:770px}.map-links{display:flex;flex-wrap:wrap;gap:9px}.faq-list{max-width:850px}.faq-list details{border-bottom:1px solid var(--line);padding:15px 0}.faq-list summary{cursor:pointer;color:var(--text);font-weight:700}.faq-list details p{margin:12px 0 0}.topic-rail{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 36px}
.site-footer{background:#050608;border-top:1px solid var(--line);padding-top:47px}.footer-grid{display:grid;grid-template-columns:1.1fr 1.6fr .8fr;gap:45px}.footer-grid h2{font-size:17px}.footer-brand p{color:var(--muted);font-size:13px}.footer-brand .visual{margin-bottom:12px}.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px 15px;font-size:13px}.footer-grid>section:last-child .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{border-top:1px solid var(--line);margin-top:40px;display:flex;gap:30px;justify-content:space-between;color:var(--muted);font-size:12px;padding:17px 0}.footer-bottom p{margin:0}.to-top{position:fixed;right:22px;bottom:22px;z-index:20;width:40px;height:40px;background:var(--surface2);border:1px solid var(--line);border-radius:50%;color:var(--copy);opacity:0;pointer-events:none;transition:opacity .2s}.to-top.visible{opacity:1;pointer-events:auto}
.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.66);z-index:90;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .2s,visibility .2s}.site-drawer{position:fixed;top:0;bottom:0;left:0;width:min(390px,86vw);background:var(--panel);z-index:91;transform:translateX(-103%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s;overflow-y:auto;padding:22px 25px 35px;overscroll-behavior:contain}.drawer-open .site-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-open .drawer-overlay{visibility:visible;pointer-events:auto;opacity:1}.drawer-heading{display:flex;align-items:center;justify-content:space-between;padding-bottom:15px;border-bottom:1px solid var(--line)}.drawer-brand{color:var(--text);font-size:21px;font-weight:700}.drawer-brand small{display:block;font-size:11px;color:var(--muted)}.drawer-close{font-size:30px;border:0;color:var(--text);background:transparent;line-height:1}.drawer-group{padding-top:19px}.drawer-group strong{font-size:12px;letter-spacing:.13em;color:var(--ice)}.drawer-group nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px;margin-top:9px}.drawer-group a{font-size:14px;padding:5px 0}.scroll-locked{overflow:hidden}
@media(max-width:1100px){.topbar-inner{gap:10px}.brand{flex-basis:195px}.brand-note{font-size:8px}.primary-nav{gap:12px}.primary-nav a{font-size:13px}}
@media(max-width:979px){.shell{width:calc(100% - 40px)}.topbar-inner{height:64px;position:relative;justify-content:space-between}.menu-toggle{display:block}.brand{position:absolute;left:50%;transform:translateX(-50%);flex-basis:auto;width:auto;justify-content:center}.brand .visual img{max-height:28px}.brand-note{display:none}.primary-nav{display:none}.enter-button{height:40px;min-width:91px;font-size:13px}.desktop-topics{display:none}.mobile-topics{display:flex;width:100%;padding-inline:20px;overflow-x:auto;scrollbar-width:none;gap:28px}.mobile-topics::-webkit-scrollbar{display:none}.page-layout{grid-template-columns:minmax(0,1fr) 190px;gap:30px}.footer-grid{grid-template-columns:1fr 1.4fr;gap:30px}.footer-grid>section:last-child{grid-column:span 2}.footer-grid>section:last-child .footer-links{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:767px){.shell{width:calc(100% - 32px)}body{font-size:15px;line-height:1.78}h1{font-size:27px}h2{font-size:21px}h3{font-size:18px}.page-intro .dek{font-size:15px}.page-layout,.home-hero,.article-feature,.twin-columns,.magazine-feature,.mobile-feature,.inline-media,.inline-media.flip{grid-template-columns:minmax(0,1fr)}.page-layout{gap:0}.side-index{position:static;order:-1;margin-bottom:22px;padding:16px}.chapter{margin-bottom:33px}.chapter:nth-child(3n+2){padding-left:12px}.home-hero{gap:20px;margin:20px 0 38px}.home-hero h1{font-size:29px}.home-hero .lead{font-size:15px}.home-hero .visual{grid-row:1}.home-section{margin-bottom:36px}.interest-grid,.index-rows,.news-grid{grid-template-columns:1fr}.interest-card{padding:17px}.article-feature .aside-notes{padding-left:15px}.figure-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-notes{grid-template-columns:repeat(2,minmax(0,1fr))}.visual--hero{height:195px}.visual--feature{min-height:145px;max-height:185px}.visual--feature img{max-height:160px}.visual--standard{min-height:125px;max-height:165px}.visual--standard img{max-height:145px}.visual--gif{height:138px}.visual--gif img{max-height:120px}.visual--device{max-width:220px;min-height:190px;margin-inline:auto}.gallery-grid{gap:16px}.art-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.art-grid .visual{min-height:120px;max-height:160px}.art-grid .visual img{max-height:140px}.sequence{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-grid>section:first-child{grid-column:span 2}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid>section:last-child .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{display:block}.footer-bottom p{margin-top:8px}.image-story{margin:22px 0}.main-content{padding-bottom:45px}.inline-media{gap:18px}}
@media(max-width:374px){.enter-button{min-width:80px;padding:0 9px;font-size:12px}.menu-toggle{width:40px}.brand .visual img{max-width:90px}.art-grid,.gallery-grid{grid-template-columns:1fr}.gallery-grid>*:nth-child(3n+1){grid-column:auto}.visual-notes{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-grid>section:first-child,.footer-grid>section:last-child{grid-column:auto}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}