/* PG电子 — original, dependency-free editorial design */
:root{color-scheme:dark;--bg:#080A0D;--panel:#12161C;--pane2:#171C23;--text:#F5F7FA;--body:#C7CDD5;--muted:#9098A3;--blue:#5C7CFA;--bright:#6EA8FF;--line:rgba(255,255,255,.09)}*{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}body.drawer-open{overflow:hidden}a{color:var(--bright);text-decoration:none}a:hover{color:#8ED8FF}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #8ED8FF;outline-offset:4px}button{font:inherit;cursor:pointer}img{display:block;max-width:100%;height:auto;object-fit:contain;object-position:center center}figure{margin:0;min-width:0;max-width:100%}p{margin:0 0 16px}h1,h2,h3,h4{color:var(--text);line-height:1.38;letter-spacing:.01em}h1{font-size:clamp(32px,3.3vw,35px);margin:12px 0 24px}h2{font-size:26px;margin:0 0 20px}h3{font-size:19px;margin:0 0 12px}.wrap{width:min(1200px,calc(100% - 48px));margin:0 auto}.skip-link{position:absolute;left:12px;top:-90px;background:var(--blue);color:#fff;padding:8px 12px;z-index:99}.skip-link:focus{top:8px}.site-header{position:relative;background:rgba(8,10,13,.96);border-bottom:1px solid var(--line);z-index:15}.brand-row{display:flex;align-items:center;gap:22px;height:76px}.brand{display:flex;align-items:center;gap:8px;flex:0 0 auto;max-width:235px;white-space:nowrap}.logo{width:auto;max-width:130px;max-height:36px}.brand-en{font-size:9px;letter-spacing:.04em;color:var(--muted);line-height:1.2;max-width:95px;white-space:normal}.logo-fallback{font-weight:800;font-size:20px;color:#fff}.desktop-nav{margin-left:auto;display:flex;align-items:center;gap:clamp(12px,1.3vw,22px);white-space:nowrap}.desktop-nav a{font-size:14px;color:#D5DAE2;position:relative;padding:25px 0}.desktop-nav a[aria-current]{color:var(--bright)}.desktop-nav a[aria-current]:after{content:'';height:2px;background:var(--bright);position:absolute;bottom:10px;left:0;right:0}.enter-link{margin-left:12px;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;min-height:42px;padding:0 20px;background:var(--blue);color:#fff;border-radius:999px;font-size:14px;font-weight:700}.enter-link:hover{background:#7390FF;color:#fff}.menu-trigger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#12161C;padding:10px;flex:0 0 auto}.menu-trigger span{display:block;height:2px;background:#F5F7FA;margin:4px 0}.quickbar{background:#10141A;border-bottom:1px solid var(--line)}.quickbar-inner{min-width:0}.quick-desktop,.quick-mobile{display:flex;align-items:center;gap:28px;min-height:44px;white-space:nowrap}.quickbar a{font-size:13px;color:#BBC4D1}.quickbar a:hover{color:var(--bright)}.quick-mobile{display:none}.breadcrumb{display:flex;gap:11px;align-items:center;flex-wrap:wrap;margin:26px 0 18px;font-size:13px;color:var(--muted)}.breadcrumb strong{color:#DCE4EF;font-weight:500}.main-content{padding:0 0 68px;min-height:45vh}.page-heading{max-width:860px;padding:24px 0 20px}.page-heading .lead{font-size:17px;line-height:1.85;max-width:790px}.eyebrow{font-size:12px;letter-spacing:.18em;color:#8ED8FF;text-transform:uppercase}.page-heading h1{margin-top:14px}.article-opening{max-width:820px;margin:4px 0 30px}.lead{font-size:17px;color:#D8E0EA;line-height:1.85}.article-body{max-width:820px}.article-body.wide{max-width:none}.article-section{padding:30px 0;border-top:1px solid var(--line)}.article-section p{line-height:1.85}.article-section h2{margin-top:0}.section-next{font-size:14px;color:var(--muted)}.section-next a{font-weight:700}.narrow-reading{max-width:780px}.intro-grid,.split-editorial,.feature-split,.mobile-feature{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:32px;align-items:center}.layout-aside{display:grid;grid-template-columns:minmax(0,820px) minmax(200px,1fr);gap:42px;align-items:start}.sidebar-note{position:sticky;top:20px;border-top:2px solid #5C7CFA;padding-top:18px}.sidebar-note a{display:block;padding:9px 0;border-bottom:1px solid var(--line);font-size:14px}.note-panel{background:var(--panel);padding:22px 24px;border-left:3px solid var(--blue);border-radius:0 12px 12px 0;margin:24px 0}.note-panel p{margin:0}.reading-steps{counter-reset:step;list-style:none;padding:0;margin:20px 0;display:grid;gap:14px}.reading-steps li{position:relative;padding:20px 22px 18px 68px;background:var(--panel);border:1px solid var(--line);border-radius:12px;min-width:0}.reading-steps li:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:20px;top:19px;color:var(--bright);font-weight:700}.reading-steps p{margin:4px 0 0}.two-columns,.subject-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.subject{padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:14px}.subject h3{margin-bottom:8px}.subject p{margin-bottom:12px}.subject a{font-size:14px}.subtle-divider{border:0;border-top:1px solid var(--line);margin:42px 0}.section-block{margin:52px 0}.section-kicker{display:block;color:var(--bright);font-size:12px;letter-spacing:.16em;margin-bottom:14px}.section-intro{max-width:780px}.figure{margin:22px 0}.image-surface,.image-placeholder{background:#0D1015;border:1px solid var(--line);border-radius:13px;min-width:0;max-width:100%;display:flex;align-items:center;justify-content:center;padding:12px}.image-surface img{display:block;max-height:245px;width:auto;max-width:100%;height:auto;object-fit:contain}.image-placeholder{min-height:170px;color:var(--muted);font-size:13px;text-align:center}.hero-figure .image-surface,.hero-figure .image-placeholder{min-height:260px;height:300px}.hero-figure img{max-height:100%}.small-figure .image-surface,.small-figure .image-placeholder{height:165px;min-height:0}.small-figure img{max-height:100%}.feature-figure .image-surface,.feature-figure .image-placeholder{min-height:195px;max-height:255px}.feature-figure img{max-height:235px}.phone-figure{max-width:270px;margin-inline:auto}.phone-figure .image-surface,.phone-figure .image-placeholder{max-height:340px;min-height:260px}.phone-figure img{max-height:320px}.gif-figure .image-surface,.gif-figure .image-placeholder{height:150px;min-height:0}.gif-figure img{max-height:100%}.gallery-figure .image-surface{min-height:165px}.gallery-figure img{max-height:290px}.figure figcaption{font-size:13px;color:var(--muted);line-height:1.6;margin-top:9px}.visual-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.visual-card{min-width:0}.visual-card h3{font-size:17px;margin-top:12px}.visual-card p{font-size:14px;line-height:1.75}.visual-card .figure{margin:0}.visual-card .image-surface,.visual-card .image-placeholder{min-height:170px;height:190px}.visual-card img{max-height:100%}.notes-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.note-cell{border-top:2px solid rgba(110,168,255,.5);padding:13px 3px}.note-cell span{font-size:12px;color:var(--bright)}.note-cell h3{margin:8px 0;font-size:17px}.indexed-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 30px;counter-reset:item}.indexed-links a{display:flex;gap:17px;border-top:1px solid var(--line);padding:20px 0;color:var(--body)}.indexed-links a:before{counter-increment:item;content:counter(item,decimal-leading-zero);color:var(--bright)}.indexed-links strong{display:block;color:#fff}.indexed-links small{display:block;color:var(--muted);font-size:13px;margin-top:6px;line-height:1.6}.related{border-top:1px solid var(--line);margin-top:44px;padding-top:30px}.related h2{font-size:22px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-grid a{display:flex;justify-content:space-between;align-items:center;background:var(--panel);padding:14px 16px;border:1px solid var(--line);border-radius:10px;color:#DDE5F0}.related-grid a:hover{border-color:var(--bright)}.compare-table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}.compare-table th,.compare-table td{border-bottom:1px solid var(--line);padding:14px 12px;text-align:left;vertical-align:top}.compare-table th{color:#fff;background:#171C23}.numbered-articles{counter-reset:a}.indexed-article{display:grid;grid-template-columns:46px minmax(0,1fr);gap:16px;padding:24px 0;border-top:1px solid var(--line)}.indexed-article:before{counter-increment:a;content:counter(a,decimal-leading-zero);color:#8ED8FF;font-size:19px}.indexed-article h2{font-size:21px;margin:0 0 10px}.indexed-article p{margin-bottom:8px}.faq-item{background:#12161C;border:1px solid var(--line);border-radius:10px;margin:12px 0;padding:16px 20px}.faq-item summary{font-weight:700;color:#E8EDF5;cursor:pointer}.faq-item p{margin:12px 0 0}.category-board{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.category-board article{background:var(--panel);border:1px solid var(--line);padding:23px;border-radius:12px}.category-board article a{display:inline-block;margin:5px 16px 0 0;font-size:14px}.minor-note{font-size:14px;color:var(--muted)}.hero-home{padding:48px 0 18px}.hero-home h1{font-size:clamp(28px,3.5vw,42px)}.hero-home .lead{max-width:640px}.text-links{display:flex;gap:20px;flex-wrap:wrap;margin-top:22px;font-size:14px}.home-two{display:grid;grid-template-columns:1.3fr .7fr;gap:34px}.home-callout{padding:24px;background:var(--panel);border-top:2px solid var(--blue)}.reading-band{padding:26px;background:#10141A;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:44px 0}.site-footer{background:#050608;border-top:1px solid var(--line);padding:47px 0 0}.footer-grid{display:grid;grid-template-columns:1fr 1.7fr .85fr;gap:44px}.footer-logo{max-height:34px;max-width:140px}.footer-brand p{margin-top:16px;font-size:14px;color:var(--muted)}.site-footer h2{font-size:16px;margin:0 0 18px}.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px 15px}.footer-grid>div:last-child .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-links a{font-size:13px;color:#AAB4C2}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:22px 0 30px;margin-top:38px;font-size:12px;color:var(--muted)}.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:30;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .2s,visibility .2s}.drawer-overlay.is-open{visibility:visible;pointer-events:auto;opacity:1}.site-drawer{position:fixed;top:0;bottom:0;left:0;width:min(86vw,390px);z-index:31;background:#0D1015;padding:20px 24px 30px;overflow-y:auto;overscroll-behavior:contain;transform:translateX(-102%);transition:transform .24s,visibility .24s;visibility:hidden;pointer-events:none}.site-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:15px;border-bottom:1px solid var(--line)}.drawer-logo{max-height:32px;max-width:145px}.drawer-close{background:transparent;border:1px solid var(--line);color:#fff;border-radius:8px;font-size:24px;width:40px;height:40px}.drawer-group{margin-top:20px}.drawer-group h2{font-size:13px;color:#8ED8FF;margin:0 0 10px}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}.drawer-links a{padding:7px 0;color:#CCD5E1;font-size:14px}.back-to-top{position:fixed;right:20px;bottom:22px;width:42px;height:42px;background:#172238;border:1px solid #52668C;border-radius:50%;color:#fff;z-index:12}.back-to-top[hidden]{display:none}
@media(max-width:1099px){.desktop-nav{gap:12px}.brand-en{display:none}.brand{max-width:145px}.enter-link{padding-inline:16px}}
@media(max-width:979px){.wrap{width:calc(100% - 40px)}.brand-row{height:64px;position:relative;justify-content:space-between}.menu-trigger{display:block}.brand{position:absolute;left:50%;transform:translateX(-50%);margin:0;max-width:130px;justify-content:center}.logo{max-height:28px;max-width:105px}.desktop-nav{display:none}.brand-en{display:none}.enter-link{margin:0;padding:0 14px;min-height:40px;font-size:13px}.quick-desktop{display:none}.quick-mobile{display:flex;gap:24px;min-height:42px;width:100%;overflow-x:auto;scrollbar-width:none}.quick-mobile::-webkit-scrollbar{display:none}.quickbar-inner{min-width:0}.layout-aside{grid-template-columns:minmax(0,1fr)}.sidebar-note{position:static;display:flex;gap:16px;flex-wrap:wrap}.sidebar-note a{border:none}.notes-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}.footer-links{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:767px){.intro-grid,.split-editorial,.feature-split,.mobile-feature,.home-two{grid-template-columns:1fr;gap:22px}.hero-home .intro-grid>.hero-figure{order:-1}.mobile-feature>.phone-figure{order:-1}.feature-split>.feature-figure{order:-1}.two-columns,.subject-grid,.category-board{grid-template-columns:1fr}.visual-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.section-block{margin:34px 0}.page-heading{padding-top:12px}.footer-grid{gap:25px}.footer-bottom{flex-direction:column}.indexed-links{grid-template-columns:1fr}.related-grid{grid-template-columns:1fr 1fr}.hero-figure .image-surface,.hero-figure .image-placeholder{min-height:0;height:220px}.article-section{padding:24px 0}}
@media(max-width:479px){.wrap{width:calc(100% - 32px)}body{font-size:15px}.brand-row{height:62px}.menu-trigger{width:40px;height:40px}.brand{max-width:110px}.logo{max-width:94px;max-height:28px}.enter-link{min-height:38px;padding:0 12px;font-size:12px}.quick-mobile{gap:20px}.quickbar a{font-size:13px}.main-content{padding-bottom:44px}h1{font-size:25px}h2{font-size:21px}h3{font-size:17px}.hero-home h1{font-size:29px}.lead,.page-heading .lead{font-size:15px}.hero-home{padding-top:26px}.hero-figure .image-surface,.hero-figure .image-placeholder{height:185px}.visual-grid{gap:12px}.visual-card .image-surface,.visual-card .image-placeholder{height:145px;min-height:0}.visual-card p{font-size:13px}.notes-grid{grid-template-columns:1fr 1fr}.related-grid{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid>div:last-child .footer-links{grid-template-columns:1fr 1fr}.site-drawer{width:min(86vw,340px);padding:16px}.phone-figure{max-width:220px}.phone-figure .image-surface,.phone-figure .image-placeholder{max-height:340px}.gif-figure .image-surface,.gif-figure .image-placeholder{height:120px}.small-figure .image-surface,.small-figure .image-placeholder{height:140px}.compare-table{font-size:13px}.compare-table th,.compare-table td{padding:9px 6px}.reading-steps li{padding-left:54px}.reading-steps li:before{left:14px}}
@media(max-width:340px){.logo{max-width:86px}.enter-link{padding-inline:10px}.visual-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* The cover poster is a complete banner rather than a cropped hero image. */
.hero-home .hero-figure .image-surface,.hero-home .hero-figure .image-placeholder{height:245px;min-height:0}.hero-home .hero-figure img{max-height:100%}@media(max-width:767px){.hero-home .hero-figure .image-surface,.hero-home .hero-figure .image-placeholder{height:180px}}@media(max-width:479px){.hero-home .hero-figure .image-surface,.hero-home .hero-figure .image-placeholder{height:145px}}