:root{--primary:#6C4FF8;--primary-soft:#9B8AFB;--ink:#252331;--deep:#1E1B2E;--bg:#F7F6FB;--bg2:#EEEAF8;--muted:#716E7E;--accent:#F06A8A;--line:#ded8ef;--white:#fff;--shadow:0 20px 55px rgba(30,27,46,.08);--radius:24px;--content:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.72}img{display:block;max-width:100%;height:auto;border-radius:22px;background:var(--bg2)}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.skip-link{position:absolute;left:-999px;top:0;background:var(--deep);color:#fff;padding:.7rem 1rem;z-index:1000}.skip-link:focus{left:1rem;top:1rem}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,246,251,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(108,79,248,.12)}.header-inner{max-width:var(--content);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:.9rem 1.25rem}.brand-lockup{display:flex;align-items:center;gap:.8rem;color:var(--deep)}.brand-lockup:hover{text-decoration:none}.brand-lockup img{width:44px;height:44px;border-radius:14px}.brand-lockup span{display:grid}.brand-lockup strong{font-size:1.08rem}.brand-lockup small{color:var(--muted);font-size:.78rem}.site-nav{display:flex;gap:.25rem;align-items:center}.site-nav a{color:var(--ink);padding:.65rem .85rem;border-radius:999px;font-weight:650}.site-nav a:hover,.site-nav a.is-active{background:var(--bg2);text-decoration:none;color:var(--primary)}.menu-button{display:none;border:1px solid var(--line);background:#fff;padding:.65rem .9rem;border-radius:12px;font:inherit}.site-main{max-width:var(--content);margin:auto;padding:0 1.25rem}.hero-shell{display:grid;grid-template-columns:1.08fr .92fr;gap:3rem;align-items:center;padding:5.3rem 0 3.4rem}.hero-copy h1,.page-hero h1{font-size:clamp(2.45rem,5vw,4.75rem);line-height:1.08;letter-spacing:-.04em;margin:.4rem 0 1.2rem;color:var(--deep)}.eyebrow{font-size:.82rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--primary);margin:0 0 .5rem}.lead{font-size:1.14rem;color:#4f4b5d;max-width:760px}.button-row{display:flex;flex-wrap:wrap;gap:.8rem;margin:1.7rem 0}.button{display:inline-flex;align-items:center;justify-content:center;padding:.85rem 1.15rem;border-radius:14px;background:var(--primary);color:#fff;font-weight:750;box-shadow:0 10px 25px rgba(108,79,248,.18)}.button:hover{text-decoration:none;transform:translateY(-1px)}.button-ghost{background:#fff;color:var(--primary);border:1px solid var(--line);box-shadow:none}.button-small{padding:.75rem 1rem}.hero-points{display:flex;flex-wrap:wrap;gap:.6rem 1.3rem;padding:0;margin:1.3rem 0 0;list-style:none;color:var(--muted);font-size:.95rem}.hero-points li:before{content:"•";color:var(--accent);margin-right:.45rem}.hero-media img{box-shadow:var(--shadow);min-height:420px;object-fit:cover}.section-shell{padding:3.5rem 0}.section-heading{max-width:760px;margin-bottom:1.8rem}.section-heading h2,.feature-copy h2,.compact-grid h2,.related-strip h2,.topic-stack h2,.device-grid h2,.official-copy h2,.device-compare h2{font-size:clamp(1.7rem,3vw,2.55rem);line-height:1.2;margin:.35rem 0 .8rem;color:var(--deep)}.path-list{display:grid;gap:.8rem}.path-item{display:grid;grid-template-columns:120px 1fr auto;gap:1.2rem;align-items:center;padding:1.2rem 1.25rem;border:1px solid var(--line);background:#fff;border-radius:18px}.path-item>span{font-size:.78rem;color:var(--primary);font-weight:800;background:var(--bg2);padding:.45rem .65rem;border-radius:999px;text-align:center}.path-item h3{margin:0 0 .2rem;font-size:1.1rem}.path-item p{margin:0;color:var(--muted)}.text-link{font-weight:760}.feature-band{display:grid;grid-template-columns:1fr .86fr;gap:3rem;align-items:center;background:var(--bg2);border-radius:32px;padding:2.2rem}.feature-band.reverse{grid-template-columns:.86fr 1fr}.feature-copy p{color:#514d5e}.inline-links{display:flex;flex-wrap:wrap;gap:.8rem}.inline-links a{background:#fff;border:1px solid var(--line);padding:.7rem .85rem;border-radius:12px;font-weight:700}.compact-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.compact-grid article{background:#fff;border:1px solid var(--line);border-radius:24px;padding:1.7rem}.compact-grid p{color:var(--muted)}.related-strip{display:flex;justify-content:space-between;align-items:center;gap:2rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.related-strip>div{max-width:780px}.faq-list{display:grid;gap:.8rem}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:1rem 1.1rem}.faq-list summary{cursor:pointer;font-weight:760;color:var(--deep)}.faq-list p{color:var(--muted)}.breadcrumb{padding-top:1.3rem}.breadcrumb ol{display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0;list-style:none;font-size:.9rem;color:var(--muted)}.breadcrumb li:not(:last-child):after{content:"/";margin-left:.4rem;color:#b6afc7}.page-hero{padding:3.3rem 0 2.6rem}.split-hero{display:grid;grid-template-columns:1fr .78fr;gap:3rem;align-items:center}.text-hero{max-width:920px}.text-hero.narrow{max-width:820px}.info-columns{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.info-columns article,.device-grid article,.topic-stack article{background:#fff;border:1px solid var(--line);border-radius:22px;padding:1.6rem}.info-columns h3{margin:.1rem 0 .55rem;color:var(--deep)}.info-columns p,.device-grid p,.topic-stack p,.official-copy p{color:var(--muted)}.reading-flow{display:grid;gap:0}.reading-item{display:grid;grid-template-columns:80px 1fr;gap:1rem;padding:1.6rem 0;border-top:1px solid var(--line)}.reading-item:last-child{border-bottom:1px solid var(--line)}.reading-item .number{font-size:1.7rem;font-weight:800;color:var(--primary-soft)}.reading-item h3{margin:.1rem 0 .4rem;font-size:1.3rem}.reading-item p{margin:0;color:var(--muted)}.official-layout{display:grid;grid-template-columns:1fr 360px;gap:2rem;align-items:start}.official-copy{display:grid;gap:1rem}.official-copy article{padding-bottom:1.5rem;border-bottom:1px solid var(--line)}.side-panel{position:sticky;top:96px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:1rem;display:grid;gap:.7rem}.side-panel h2{font-size:1.25rem;margin:.4rem 0 0}.side-panel a{padding:.65rem .75rem;background:var(--bg);border-radius:12px}.note-band{display:grid;grid-template-columns:1fr .65fr;gap:2rem;align-items:center}.device-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.device-compare{overflow:hidden}.compare-table{display:grid;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff}.compare-table>[role=row]{display:grid;grid-template-columns:.7fr 1.4fr 1fr}.compare-table span{padding:1rem;border-bottom:1px solid var(--line)}.compare-table span+span{border-left:1px solid var(--line)}.compare-table>[role=row]:last-child span{border-bottom:0}.compare-head{background:var(--bg2);font-weight:800}.topic-stack{display:grid;gap:1rem}.topic-stack article:nth-child(even){margin-left:8%}.topic-stack article:nth-child(odd){margin-right:8%}.error-shell{max-width:720px;margin:8rem auto;padding:2rem;text-align:center;background:#fff;border:1px solid var(--line);border-radius:28px}.site-footer{margin-top:4rem;background:var(--deep);color:#d8d4e4;padding:3rem 1.25rem 1.2rem}.footer-grid{max-width:var(--content);margin:auto;display:grid;grid-template-columns:1.4fr 1fr;gap:2rem}.footer-brand{font-size:1.4rem;font-weight:800;color:#fff;margin:0}.footer-grid nav{display:grid;grid-template-columns:repeat(2,1fr);gap:.55rem}.footer-grid a{color:#f0edf8}.copyright{max-width:var(--content);margin:2rem auto 0;border-top:1px solid rgba(255,255,255,.12);padding-top:1rem;color:#a9a3b8;font-size:.9rem}
@media(max-width:900px){.menu-button{display:block}.site-nav{position:absolute;left:1rem;right:1rem;top:72px;display:none;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:.7rem;box-shadow:var(--shadow)}.site-nav.is-open{display:flex}.site-nav a{padding:.8rem}.hero-shell,.split-hero,.feature-band,.feature-band.reverse,.official-layout,.note-band{grid-template-columns:1fr}.hero-shell{padding-top:3rem}.hero-media{order:-1}.compact-grid,.info-columns,.device-grid{grid-template-columns:1fr}.official-layout .side-panel{position:static}.path-item{grid-template-columns:1fr}.path-item>span{width:max-content}.related-strip{align-items:flex-start;flex-direction:column}.topic-stack article:nth-child(n){margin:0}.footer-grid{grid-template-columns:1fr}}
@media(max-width:620px){.header-inner{padding:.75rem 1rem}.brand-lockup small{display:none}.site-main{padding:0 1rem}.hero-copy h1,.page-hero h1{font-size:2.45rem}.hero-shell{gap:1.5rem}.section-shell{padding:2.6rem 0}.feature-band{padding:1.25rem;border-radius:22px}.reading-item{grid-template-columns:48px 1fr}.compare-table>[role=row]{grid-template-columns:1fr}.compare-table span+span{border-left:0}.compare-table span{border-bottom:1px solid var(--line)!important}.compare-table>[role=row] span:last-child{border-bottom:0!important}.footer-grid nav{grid-template-columns:1fr}.button-row{align-items:stretch}.button{width:100%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.scenario-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.scenario-grid article{background:#fff;border:1px solid var(--line);border-radius:20px;padding:1.45rem}.scenario-grid h3{margin:.1rem 0 .55rem;font-size:1.15rem;color:var(--deep)}.scenario-grid p{margin:0;color:var(--muted)}.compact-scenarios{grid-template-columns:repeat(3,1fr)}.decision-list{display:grid;gap:.7rem}.decision-list article{display:grid;grid-template-columns:1fr 160px 2fr;gap:1rem;align-items:start;padding:1.05rem 1.15rem;border-bottom:1px solid var(--line)}.decision-list strong{color:var(--deep)}.decision-list span{font-weight:800;color:var(--primary)}.decision-list p{margin:0;color:var(--muted)}
@media(max-width:900px){.compact-scenarios{grid-template-columns:repeat(2,1fr)}.decision-list article{grid-template-columns:1fr 120px 1.6fr}}
@media(max-width:620px){.scenario-grid,.compact-scenarios{grid-template-columns:1fr}.decision-list article{grid-template-columns:1fr;gap:.3rem;padding:1rem 0}}