:root{--primary:#5B4BDB;--primary-soft:#8B7CF6;--deep:#1E1B2E;--bg:#F7F7FB;--bg-soft:#EFEFFC;--text:#292734;--muted:#6F6B7A;--accent:#F05A7E;--white:#fff;--line:#dddceb;--shadow:0 18px 50px rgba(30,27,46,.08);--radius:24px;--radius-sm:16px;--shell:min(1180px,calc(100% - 40px));}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.72;text-rendering:optimizeLegibility}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input{font:inherit}.shell{width:var(--shell);margin-inline:auto}.narrow{max-width:860px}.skip-link{position:fixed;left:16px;top:16px;z-index:1000;padding:10px 14px;background:var(--deep);color:#fff;border-radius:10px;transform:translateY(-160%)}.skip-link:focus{transform:none}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,247,251,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(221,220,235,.85)}.header-shell{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:44px;height:44px;object-fit:contain}.brand span{display:grid;line-height:1.05}.brand strong{font-size:1.25rem;color:var(--deep)}.brand small{margin-top:6px;color:var(--muted);font-size:.75rem}.main-nav{display:flex;align-items:center;gap:6px}.main-nav a{padding:9px 12px;border-radius:10px;color:var(--muted);font-size:.94rem}.main-nav a:hover,.main-nav a:focus-visible,.main-nav a.is-active{background:var(--bg-soft);color:var(--primary)}.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 13px;color:var(--deep)}.breadcrumbs{width:var(--shell);margin:18px auto 0}.breadcrumbs ol{display:flex;gap:8px;align-items:center;list-style:none;padding:0;margin:0;color:var(--muted);font-size:.86rem}.breadcrumbs li+li:before{content:"/";margin-right:8px;color:#aaa6bc}.breadcrumbs a:hover{color:var(--primary)}.hero{padding:72px 0 58px}.hero-grid,.page-hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}.hero-copy h1,.page-hero h1,.detail-header h1{margin:10px 0 18px;color:var(--deep);font-size:clamp(2.4rem,5vw,5.1rem);line-height:1.04;letter-spacing:-.045em}.page-hero h1{font-size:clamp(2.25rem,4.5vw,4.4rem)}.eyebrow{margin:0;color:var(--primary);font-size:.82rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.lead{font-size:1.15rem;color:var(--muted);max-width:760px}.max-copy{max-width:820px}.hero-media,.page-hero img{margin:0}.hero-media img,.page-hero-grid>img{border-radius:32px;box-shadow:var(--shadow);aspect-ratio:4/3;object-fit:cover}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:13px;font-weight:750;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--primary);color:white;box-shadow:0 10px 24px rgba(91,75,219,.24)}.button.secondary{background:#fff;border:1px solid var(--line);color:var(--deep)}.hero-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:34px 0 0}.hero-facts div{padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:14px}.hero-facts dt{color:var(--muted);font-size:.78rem}.hero-facts dd{margin:4px 0 0;font-weight:760;color:var(--deep);font-size:.9rem}.section{padding:72px 0}.soft-section{background:var(--bg-soft)}.section-brand{padding-top:32px}.split-intro{display:grid;grid-template-columns:.85fr 1.15fr;gap:64px;align-items:end;margin-bottom:30px}.split-intro h2,.section-heading h2,.sticky-title h2,.app-strip h2,.faq-section h2,.prose h2,.index-intro h2,.two-col-callout h2,.app-info-grid h2,.mobile-demo h2,.empty-state h2,.results-heading h2{margin:8px 0 0;color:var(--deep);font-size:clamp(1.8rem,3vw,3rem);line-height:1.12;letter-spacing:-.03em}.split-intro>p{margin:0;color:var(--muted)}.entry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.entry-card{min-height:250px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:20px;display:flex;flex-direction:column;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.entry-card:hover{transform:translateY(-4px);border-color:rgba(91,75,219,.35);box-shadow:var(--shadow)}.entry-card>span{align-self:flex-start;padding:5px 9px;border-radius:999px;background:var(--bg-soft);color:var(--primary);font-size:.78rem;font-weight:800}.entry-card h3{font-size:1.26rem;line-height:1.25;margin:18px 0 10px;color:var(--deep)}.entry-card p{color:var(--muted);font-size:.92rem;margin:0 0 18px}.entry-card strong{margin-top:auto;color:var(--primary);font-size:.9rem}.content-rail{display:grid;grid-template-columns:320px 1fr;gap:44px;align-items:start}.section-heading{position:sticky;top:110px}.section-heading p:last-child{color:var(--muted)}.feature-list{display:grid;gap:14px}.feature-row{display:grid;grid-template-columns:180px 1fr;gap:20px;padding:16px;background:rgba(255,255,255,.76);border:1px solid rgba(255,255,255,.8);border-radius:18px}.feature-row img{width:100%;height:100%;min-height:140px;object-fit:cover;border-radius:13px}.feature-row h3{margin:8px 0 7px;font-size:1.16rem;line-height:1.3;color:var(--deep)}.feature-row p{margin:0;color:var(--muted);font-size:.9rem}.tag-row{display:flex;gap:7px;flex-wrap:wrap}.tag-row span{font-size:.72rem;font-weight:750;color:var(--primary);background:var(--bg-soft);padding:4px 8px;border-radius:999px}.tag-row.large span{font-size:.8rem;padding:6px 10px}.text-link{display:inline-flex;margin-top:18px;color:var(--primary);font-weight:800}.video-intro-grid{display:grid;grid-template-columns:340px 1fr;gap:56px;align-items:start}.sticky-title{position:sticky;top:110px}.sticky-title p{color:var(--muted)}.compact-list{display:grid;border-top:1px solid var(--line)}.compact-list article{display:grid;grid-template-columns:54px 1fr;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}.list-index{font-weight:800;color:var(--primary-soft)}.compact-list h3{margin:0 0 5px;font-size:1.18rem;color:var(--deep)}.compact-list p{margin:0;color:var(--muted)}.app-strip{padding-top:20px}.app-strip-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center;padding:38px;border-radius:28px;background:var(--deep);color:white}.app-strip-grid img{border-radius:20px;aspect-ratio:5/4;object-fit:cover}.app-strip h2{color:white}.app-strip p{color:#c9c5d7}.app-strip .text-link{color:#b9b0ff}.faq-list{display:grid;gap:10px;margin-top:28px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:15px;padding:0 18px}.faq-list summary{cursor:pointer;padding:16px 2px;font-weight:750;color:var(--deep)}.faq-list details p{color:var(--muted);margin:0 0 18px}.page-hero{padding:56px 0 52px}.compact-hero{padding-bottom:38px}.together-hero{background:linear-gradient(180deg,#f7f7fb 0%,#efeffc 100%)}.video-hero{padding-bottom:36px}.search-hero{padding-bottom:34px}.prose-grid{display:grid;grid-template-columns:260px 1fr;gap:52px;align-items:start}.side-note{position:sticky;top:110px;display:grid;padding:22px;background:var(--deep);color:#fff;border-radius:18px}.side-note span{margin-top:8px;color:#bdb5ff;font-weight:800}.side-note p{color:#c9c5d7;font-size:.88rem}.prose{font-size:1.02rem}.prose p{color:#4f4b5b}.prose h2{margin-top:38px}.inline-links{display:grid;gap:12px;margin-top:22px}.inline-links a,.choice-list a{display:grid;gap:3px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:14px}.inline-links a:hover,.choice-list a:hover{border-color:rgba(91,75,219,.4)}.inline-links strong,.choice-list strong{color:var(--deep)}.inline-links span,.choice-list span{color:var(--muted);font-size:.88rem}.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.guide-card{display:grid;grid-template-columns:180px 1fr;gap:18px;padding:16px;background:#fff;border-radius:18px;border:1px solid rgba(255,255,255,.8)}.guide-card img{width:100%;height:100%;object-fit:cover;border-radius:13px}.guide-card h3{margin:9px 0 6px;line-height:1.25}.guide-card p{margin:0;color:var(--muted);font-size:.9rem}.cta-panel{display:flex;justify-content:space-between;gap:28px;align-items:center;margin-top:28px;padding:24px 26px;background:var(--bg-soft);border-radius:18px}.cta-panel p{margin:5px 0 0;color:var(--muted)}.article-index{display:grid;grid-template-columns:280px 1fr;gap:52px;align-items:start}.index-intro{position:sticky;top:110px}.index-intro p{color:var(--muted)}.article-stack{display:grid;gap:15px}.stack-card{display:grid;grid-template-columns:50px 1fr 210px;gap:18px;align-items:center;padding:18px;background:#fff;border:1px solid var(--line);border-radius:18px}.stack-number{font-size:1.2rem;font-weight:850;color:var(--primary-soft)}.stack-card h3{margin:8px 0 5px;color:var(--deep);font-size:1.15rem}.stack-card p{margin:0;color:var(--muted);font-size:.9rem}.stack-card img{width:100%;height:150px;object-fit:cover;border-radius:14px}.two-col-callout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}.two-col-callout>div:first-child p:last-child{color:var(--muted)}.choice-list{display:grid;gap:10px}.video-layout{padding-top:28px}.video-layout-grid{display:grid;grid-template-columns:250px 1fr;gap:44px;align-items:start}.video-filter{position:sticky;top:105px;display:grid;gap:7px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:16px}.video-filter h2{font-size:1.3rem;margin:2px 0 10px}.video-filter a{padding:9px 10px;border-radius:9px;color:var(--muted)}.video-filter a:hover{background:var(--bg-soft);color:var(--primary)}.video-feed{display:grid;gap:16px}.video-card{display:grid;grid-template-columns:1fr 230px;gap:24px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:20px;scroll-margin-top:110px}.video-card h2{font-size:1.35rem;line-height:1.25;margin:9px 0 7px;color:var(--deep)}.video-card p{color:var(--muted);margin:0}.video-card .excerpt{margin-top:9px;font-size:.92rem}.video-card img{width:100%;height:100%;min-height:190px;object-fit:cover;border-radius:15px}.app-info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.app-info-grid article{padding:26px;background:#fff;border:1px solid var(--line);border-radius:18px}.app-info-grid article>span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--bg-soft);color:var(--primary);font-weight:850}.app-info-grid h2{font-size:1.3rem;margin-top:15px}.app-info-grid p{color:var(--muted)}.mobile-demo{display:grid;grid-template-columns:.9fr 1.1fr;gap:50px;align-items:center}.mobile-demo img{border-radius:24px;max-height:620px;object-fit:cover}.mobile-demo p{color:var(--muted)}.check-list{list-style:none;padding:0;display:grid;gap:10px;margin:24px 0}.check-list li{position:relative;padding-left:28px}.check-list li:before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:900}.search-form{margin-top:28px;max-width:760px}.search-form label{display:block;font-weight:750;margin-bottom:8px}.search-form>div{display:grid;grid-template-columns:1fr auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:5px}.search-form input{min-width:0;border:0;padding:12px 14px;background:transparent;outline:none}.search-form button{border:0;border-radius:10px;background:var(--primary);color:white;padding:0 22px;font-weight:800;cursor:pointer}.empty-state{text-align:center;padding:32px 0}.empty-state img{margin:0 auto 22px;border-radius:20px;max-height:280px;object-fit:cover}.suggestions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:22px}.suggestions a{padding:8px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;color:var(--primary)}.results-heading{margin-bottom:24px}.results-heading p{color:var(--muted)}.search-results{display:grid;gap:12px}.search-results article{padding:20px;background:#fff;border:1px solid var(--line);border-radius:15px}.search-results article>span{font-size:.76rem;color:var(--primary);font-weight:800}.search-results h3{margin:5px 0}.search-results p{margin:0;color:var(--muted)}.detail-header{padding:62px 0 32px;text-align:center}.detail-header h1{font-size:clamp(2.1rem,4vw,4rem)}.detail-header .lead{margin-inline:auto}.detail-header .tag-row{justify-content:center}.detail-body{max-width:980px;padding-bottom:72px}.detail-body figure{margin:0 0 38px}.detail-body figure img{width:100%;max-height:560px;object-fit:cover;border-radius:26px}.detail-body .prose{max-width:760px;margin:0 auto;font-size:1.08rem}.detail-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.not-found{padding:110px 0;text-align:center}.error-code{display:block;font-size:clamp(5rem,18vw,12rem);line-height:.8;font-weight:900;color:var(--primary-soft);opacity:.28}.not-found h1{font-size:2.2rem;margin:30px 0 10px}.not-found p{color:var(--muted)}.not-found .hero-actions{justify-content:center}.site-footer{padding:52px 0;background:var(--deep);color:white}.footer-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:44px}.footer-brand{font-size:1.7rem}.site-footer p{color:#aaa6b8;font-size:.9rem}.footer-links{display:grid;align-content:start;gap:8px}.footer-links a{color:#d6d2e0;font-size:.9rem}.footer-links a:hover{color:white}.footer-note{margin:0}.menu-toggle:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(240,90,126,.45);outline-offset:3px}@media (max-width:980px){:root{--shell:min(100% - 30px,900px)}.main-nav{position:absolute;left:15px;right:15px;top:68px;display:none;flex-direction:column;align-items:stretch;padding:12px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.main-nav.is-open{display:flex}.menu-toggle{display:block}.hero-grid,.page-hero-grid,.split-intro,.app-strip-grid,.two-col-callout,.mobile-demo{grid-template-columns:1fr}.hero-grid{gap:30px}.hero-media{order:-1}.hero-media img{max-height:430px;width:100%}.entry-grid{grid-template-columns:repeat(2,1fr)}.content-rail,.video-intro-grid,.article-index,.video-layout-grid,.prose-grid{grid-template-columns:1fr}.section-heading,.sticky-title,.index-intro,.video-filter,.side-note{position:static}.guide-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-note{grid-column:1/-1}.stack-card{grid-template-columns:44px 1fr}.stack-card img{grid-column:2}.video-card{grid-template-columns:1fr 200px}}
@media (max-width:680px){:root{--shell:calc(100% - 24px)}body{line-height:1.66}.header-shell{min-height:68px}.brand small{display:none}.hero,.section,.page-hero{padding:48px 0}.hero-copy h1,.page-hero h1{font-size:2.35rem}.hero-grid,.page-hero-grid{gap:24px}.page-hero-grid>img{max-height:340px;width:100%}.lead{font-size:1rem}.hero-facts{grid-template-columns:1fr}.entry-grid{grid-template-columns:1fr}.entry-card{min-height:0}.feature-row{grid-template-columns:110px 1fr}.feature-row img{min-height:110px}.feature-row .tag-row{display:none}.app-strip-grid{padding:24px}.guide-card{grid-template-columns:1fr}.guide-card img{max-height:220px}.cta-panel{align-items:flex-start;flex-direction:column}.stack-card{grid-template-columns:36px 1fr;padding:14px}.stack-card img{grid-column:1/-1;height:180px}.video-card{grid-template-columns:1fr}.video-card img{order:-1;max-height:220px}.app-info-grid{grid-template-columns:1fr}.search-form>div{grid-template-columns:1fr}.search-form button{min-height:44px}.footer-grid{grid-template-columns:1fr}.footer-note{grid-column:auto}.breadcrumbs{overflow-x:auto;white-space:nowrap}.compact-list article{grid-template-columns:42px 1fr}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
/* Extended component states and reading comfort */
.site-header.has-shadow{box-shadow:0 8px 30px rgba(30,27,46,.06)}
::selection{background:rgba(91,75,219,.18);color:var(--deep)}
.prose a:not(.button),.detail-body a:not(.button){color:var(--primary);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose strong,.detail-body strong{color:var(--deep)}
.prose ul,.detail-body ul{padding-left:1.25rem}.prose li+li,.detail-body li+li{margin-top:.5rem}
.hero-media img,.page-hero-grid>img,.feature-row img,.guide-card img,.stack-card img,.video-card img,.detail-body figure img{background:#e8e7f2}
.entry-card:focus-visible,.guide-card:focus-within,.stack-card:focus-within,.video-card:focus-within{box-shadow:0 0 0 4px rgba(91,75,219,.12)}
@supports (text-wrap:balance){h1,h2,h3{text-wrap:balance}.lead{text-wrap:pretty}}
@media print{.site-header,.site-footer,.breadcrumbs,.hero-actions,.menu-toggle,.video-filter{display:none!important}body{background:white;color:black}.section,.page-hero,.hero{padding:20px 0}.shell{width:100%}a{text-decoration:underline}.soft-section{background:white}.entry-card,.feature-row,.guide-card,.stack-card,.video-card,.app-info-grid article{break-inside:avoid;border-color:#bbb}.detail-body figure img{max-height:420px}}