:root{--navy:#0a172b;--ink:#14243b;--muted:#59697d;--mint:#88ecd0;--paper:#f4f7fa;--line:#dce3eb;--accent:#087a62}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.75}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}a:focus-visible,button:focus-visible{outline:3px solid #139779;outline-offset:5px}button{font:inherit;cursor:pointer}.wrap{width:min(1220px,calc(100% - 64px));margin:auto}.site-header{background:var(--navy);color:#fff;border-bottom:1px solid #ffffff20}.header-inner{min-height:96px;display:flex;align-items:center;justify-content:space-between;gap:30px}.wordmark{display:flex;align-items:center;gap:13px;font-size:21px;font-weight:700;line-height:1.3}.wordmark:hover{color:#fff}.wordmark 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h2{font-size:25px}.brand-grid,.guide-grid{grid-template-columns:1fr}.brand-card{padding:23px}.footer-grid{grid-template-columns:1fr;gap:30px}.article-grid{grid-template-columns:1fr}.toc{position:static;order:-1}.toc a{display:inline-block;margin:0 15px 10px 0}.toc p{display:none}.brand-head{display:block}.brand-cta{margin-top:22px;max-width:350px}.hero-actions{flex-wrap:wrap}.prose{font-size:16px}.guides{padding-bottom:45px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* Illustrated celestial backdrop: decorative layers never intercept links. */
body{background-color:#f4f7fa;background-image:radial-gradient(circle at 1px 1px,#7598b323 1px,transparent 0),radial-gradient(ellipse at 95% 20%,#e2e4fa70,transparent 45%);background-size:28px 28px,100% 100%;}
.hero{position:relative;isolation:isolate;overflow:hidden;background:radial-gradient(ellipse at 88% 10%,#45416b88,transparent 55%),linear-gradient(120deg,#0a172b 15%,#182c48 70%,#213952);}
.hero::before{content:'';position:absolute;z-index:-2;inset:-25px -20px -35px;background:url('/assets/celestial-pattern.svg') center/cover no-repeat;pointer-events:none;animation:celestial-drift 18s ease-in-out infinite alternate;}
.hero::after{content:'';position:absolute;z-index:-1;inset:0;pointer-events:none;background:linear-gradient(90deg,#0a172b70,transparent 64%),radial-gradient(circle at 18% 32%,#b3f4e0aa 0 1px,transparent 2px),radial-gradient(circle at 65% 24%,#e6dcffbb 0 1.5px,transparent 3px),radial-gradient(circle at 81% 80%,#b3f4e0aa 0 1px,transparent 2px);background-size:100% 100%,173px 163px,251px 211px,197px 181px;animation:star-breathe 7s ease-in-out infinite alternate;}
.hero-aside{background:#10223a66;padding:24px;border:1px solid #a5d4df45;border-radius:16px;box-shadow:0 18px 60px #030c1a28;backdrop-filter:blur(8px);}
.brand-card,.toc{box-shadow:0 6px 28px #29476706;}
@keyframes celestial-drift{from{transform:translate3d(0,0,0)}to{transform:translate3d(-12px,10px,0)}}
@keyframes star-breathe{from{opacity:.55}to{opacity:1}}
@media(max-width:700px){.hero::before{background-position:67% top;background-size:auto 100%;opacity:.65}.hero-aside{padding:20px}.hero::after{background-size:100% 100%,173px 163px,251px 211px,197px 181px}}
@media(prefers-reduced-motion:reduce){.hero::before,.hero::after{animation:none}}
/* One animated scene stays behind every route and every scroll position. */
body{position:relative;isolation:isolate;background:#0c1930;background-image:none;}
body::before,body::after{content:'';position:fixed;pointer-events:none;z-index:-1;inset:-70px;}
body::before{background: url('/assets/celestial-pattern.svg') center/cover no-repeat,radial-gradient(ellipse at 80% 15%,#57518980,transparent 55%),linear-gradient(130deg,#0a172b,#203856);animation:sky-float 9s ease-in-out infinite alternate;}
body::after{background-image:radial-gradient(circle,#c2fff0 0 2px,transparent 3px),radial-gradient(circle,#e6dfff 0 1px,transparent 2px),radial-gradient(ellipse at 10% 90%,#6c99cf44,transparent 40%),radial-gradient(ellipse at 90% 80%,#9696d33b,transparent 40%);background-size:179px 193px,257px 239px,100% 100%,100% 100%;animation:sky-stars 12s linear infinite,sky-shimmer 3s ease-in-out infinite alternate;opacity:.7;}
.hero{background:transparent;isolation:auto;overflow:visible;}
.hero::before,.hero::after{display:none;}
.site-header,footer{background:#09162bc4;backdrop-filter:blur(12px);}
.topic-bar{background:#edf6f4e8;}
.disclosure{color:#d1dfe9;}.disclosure a{color:#adf4dc;}
.section-heading h2{color:#f1f6ff;}.section-heading>.muted{color:#c4d6e8;}.section-heading .eyebrow{color:#a7ecd7;}
.brand-card{background:#f9fcfff0;border-color:#cee0ee75;box-shadow:0 10px 35px #020b2029;}
.guide-card{background:#e8eff4ee;}
.breadcrumb{color:#e3ecf5;}.breadcrumb a:hover{color:var(--mint);}
.article-head,.brand-head,.standalone,.article-grid>.prose{background:#f6f9fcf2;border:1px solid #d9e6f0aa;border-radius:16px;padding:30px;box-shadow:0 12px 40px #020b2026;}
.article-head,.brand-head{margin-top:28px;margin-bottom:26px;}.standalone{margin-top:28px;margin-bottom:50px;}.toc{background:#f9fcfff2;}
@keyframes sky-float{0%{transform:translate3d(-22px,-15px,0) scale(1.02)}100%{transform:translate3d(25px,25px,0) scale(1.06)}}
@keyframes sky-stars{from{background-position:0 0,0 0,0 0,0 0}to{background-position:179px -193px,-257px -239px,0 0,0 0}}
@keyframes sky-shimmer{from{opacity:.35}to{opacity:.85}}
@media(max-width:700px){body::before{background-position:65% center}.article-head,.brand-head,.standalone,.article-grid>.prose{padding:22px;}}
@media(prefers-reduced-motion:reduce){body::before,body::after{animation:none}}
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@media(max-width:1000px){.header-inner{align-items:flex-start;padding-top:24px;padding-bottom:24px}.compare-options{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){nav{justify-content:flex-start}.compare-panel{padding:20px}.compare-options{grid-template-columns:1fr}.comparison-table th,.comparison-table td{padding:14px;min-width:190px}.comparison-table th[scope=row]{min-width:120px}.comparison-table{min-width:500px}}
.parameter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:20px 0}.parameter-grid>div{padding:18px;background:#edf4f7;border:1px solid #d6e2e9;border-radius:9px}.parameter-grid dt{font-size:13px;color:#52697d}.parameter-grid dd{margin:6px 0;font-size:20px;font-weight:650;line-height:1.6;overflow-wrap:anywhere}.parameter-grid small{font-size:12px;color:#596c7f;display:block;line-height:1.7}.parameter-note{font-size:14px;background:#f9f2e4;border-left:3px solid #b98f37;padding:16px}.card-parameters{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:4px 0 18px}.card-parameters div{background:#edf4f7;padding:12px;border-radius:6px}.card-parameters dt{font-size:12px;color:#5e7284}.card-parameters dd{font-size:14px;font-weight:650;line-height:1.7;margin:5px 0 0}.reference-block>h2{margin-top:0}.reference-block{border-bottom:1px solid #d6e2e9;padding-bottom:16px;margin-bottom:30px}@media(max-width:700px){.parameter-grid{grid-template-columns:1fr}.parameter-grid dd{font-size:19px}}
/* Editorial design system: calm surfaces, clear hierarchy, and consistent density. */
:root{--ink:#182c40;--muted:#617185;--line:#dfe6ec;--accent:#08755e}body{font-size:15px}body::before{background-image:linear-gradient(#0b193056,#0b19306e),url('/assets/celestial-pattern.svg'),radial-gradient(ellipse at 80% 15%,#57518980,transparent 55%),linear-gradient(130deg,#0a172b,#203856);background-position:center;background-size:cover;animation-duration:14s}body::after{animation-name:sky-stars,editorial-shimmer}.site-header{position:sticky;top:0;z-index:8;background:#0b192feb;border-color:#ffffff13}.header-inner{min-height:82px;padding-top:16px;padding-bottom:16px;align-items:center}.wordmark{font-size:22px;gap:12px;flex-shrink:0}.wordmark small{font-size:10px;letter-spacing:.13em;color:#95a9bd}.mark{width:38px;height:38px;border-radius:8px;background:#99efd10b;border-color:#91cfc52e;font-size:24px}nav{gap:26px;font-size:13px;align-items:center}.nav-compare{padding:10px 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