:root{--primary:#E53935;--primary-2:#FF7043;--primary-light:#FFCDD2;--primary-soft:#FFF3E0;--gold:#F9A825;--gold-deep:#C62828;--sky:#3B82F6;--ink:#172033;--ink-2:#25324A;--ink-3:#34435E;--bg:#F7FAFC;--bg-2:#FFF8F1;--bg-3:#EFF6FF;--surface:#FFFFFF;--surface-soft:rgba(255,255,255,.88);--surface-strong:rgba(255,255,255,.97);--text:#172033;--text-2:#475569;--text-3:#718096;--line:rgba(229,57,53,.11);--line-strong:rgba(229,57,53,.24);--shadow:0 8px 28px rgba(23,32,51,.08);--shadow-hover:0 18px 44px rgba(23,32,51,.14);--radius:12px;--radius-card:16px;--radius-large:22px;--radius-pill:999px;--wrap:1320px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;object-fit:cover;border-radius:14px;display:block}.wrap{width:min(var(--wrap),calc(100% - 32px));margin:auto}.notice{height:30px;display:flex;align-items:center;justify-content:center;background:linear-gradient(90deg,#E53935,#FF7043,#F9A825);color:#fff;font-size:13px}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.header-inner{height:68px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:10px;color:var(--gold-deep);font-weight:800;white-space:nowrap}.brand img{width:38px;height:38px}.desktop-nav{display:flex;gap:14px;flex:1;align-items:center;overflow:auto}.desktop-nav a{font-size:14px;color:var(--text-2);white-space:nowrap;padding:22px 0 18px;border-bottom:2px solid transparent}.desktop-nav a:hover{color:var(--primary)}.desktop-nav a.active{color:var(--gold);border-bottom-color:var(--primary)}.head-actions{display:flex;gap:8px;align-items:center}.btn,.search-open,.menu-btn,button{border:0;border-radius:var(--radius-pill);padding:10px 16px;background:var(--primary);color:#fff;cursor:pointer}.ghost{background:#fff;color:var(--gold-deep);border:1px solid var(--line-strong)}.menu-btn{display:none}.hero{background:linear-gradient(135deg,#F7FAFC 0%,#FFF8F1 50%,#EFF6FF 100%);padding:64px 0}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:44px;align-items:center}.eyebrow{color:var(--primary);font-weight:700}.hero h1,.page-hero h1{font-size:clamp(34px,5vw,60px);line-height:1.12;margin:10px 0 18px}.lead{font-size:18px;color:var(--text-2);max-width:760px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.section{padding:56px 0}.section.alt{background:var(--bg-2)}.section.blue{background:var(--bg-3)}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:end;margin-bottom:24px}.section h2{color:var(--gold-deep);font-size:30px;margin:0}.section-head p{max-width:700px;color:var(--text-2);margin:0}.grid{display:grid;gap:18px}.grid-4{grid-template-columns:repeat(4,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:0 4px 18px rgba(23,32,51,.07)}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}.card h3{margin:10px 0 6px}.card p{color:var(--text-2)}.badge{display:inline-block;background:var(--primary-soft);color:var(--gold);border-radius:999px;padding:4px 9px;font-size:12px}.page-hero{padding:52px 0 34px;background:linear-gradient(135deg,#fff,#FFF8F1)}.page-hero .wrap{display:grid;grid-template-columns:1fr .65fr;gap:34px;align-items:center}.breadcrumb{font-size:13px;color:var(--text-3);display:flex;gap:8px}.feature-list{display:grid;gap:12px}.feature-list article{padding:16px 18px;background:#fff;border-left:3px solid var(--primary);border-radius:12px}.rank{counter-reset:r}.rank article{display:grid;grid-template-columns:42px 1fr;gap:12px;padding:16px;border-bottom:1px solid var(--line)}.rank article:before{counter-increment:r;content:counter(r);font-size:26px;font-weight:800;color:var(--text-3)}.rank article:nth-child(1):before{color:var(--gold)}.rank article:nth-child(2):before{color:var(--primary)}.rank article:nth-child(3):before{color:var(--primary-2)}.faq button{width:100%;text-align:left;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:12px;margin-top:10px}.faq .answer{padding:12px 16px;background:var(--primary-soft);border-radius:0 0 12px 12px}.site-footer{background:linear-gradient(135deg,#172033,#25324A,#34435E);color:#fff;padding:50px 0 90px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:24px}.site-footer a{display:block;color:rgba(255,255,255,.72);margin:8px 0}.site-footer a:hover{color:var(--primary-light)}.site-footer p{color:rgba(255,255,255,.72)}.copyright{text-align:center;margin-top:34px;color:rgba(255,255,255,.65)}.search-modal{display:none;position:fixed;inset:0;z-index:90;background:rgba(23,32,51,.55);align-items:flex-start;justify-content:center;padding:10vh 16px}.search-modal.is-open{display:flex}.search-modal[hidden]{display:none !important}.search-panel{width:min(700px,100%);background:#fff;border-radius:22px;padding:28px;position:relative}.search-close{position:absolute;right:16px;top:16px}.search-panel form{display:flex;gap:10px}.search-panel input{flex:1;border:1px solid var(--line-strong);border-radius:999px;padding:13px 18px}.mobile-drawer{position:fixed;z-index:50;top:98px;right:16px;width:min(320px,calc(100% - 32px));background:#fff;border-radius:16px;box-shadow:var(--shadow-hover);padding:12px}.mobile-drawer[hidden]{display:none!important}.mobile-drawer a{display:block;padding:10px}.mobile-bottom{display:none}.back-top{position:fixed;right:20px;bottom:24px}.sidebar-layout{display:grid;grid-template-columns:220px 1fr;gap:24px}.sidebar{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;height:max-content}.sidebar a{display:block;padding:9px}.media-row{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center}.app-previews img{aspect-ratio:9/16}.browser-previews img{aspect-ratio:16/10}@media(max-width:1100px){.desktop-nav{display:none}.menu-btn{display:inline-block}.sidebar{display:none}.sidebar-layout{display:block}.grid-4{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:900px){.hero-grid,.page-hero .wrap,.media-row{grid-template-columns:1fr}.grid-3{grid-template-columns:1fr 1fr}.hero{padding:42px 0}.head-actions .ghost{display:none}}@media(max-width:700px){.wrap{width:min(100% - 22px,var(--wrap))}.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.notice{font-size:11px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:40;background:#fff;border-top:1px solid var(--primary);padding:8px}.mobile-bottom a{text-align:center;font-size:12px}.back-top{bottom:62px}.site-footer{padding-bottom:120px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}


/* Expanded editorial depth */
.depth-section{background:linear-gradient(180deg,#fff 0%,#fff8f1 100%);border-top:1px solid var(--line)}
.section-head{max-width:820px;margin-bottom:24px}.section-head h2{margin:.35rem 0 .65rem;font-size:clamp(1.65rem,3vw,2.35rem);color:var(--ink)}.section-head p{margin:0;color:var(--text-2);line-height:1.9}
.depth-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.depth-card{position:relative;padding:24px 20px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:0 4px 18px rgba(23,32,51,.05)}.depth-card h3{margin:12px 0 8px;color:var(--ink);font-size:1.05rem}.depth-card p{margin:0;color:var(--text-2);line-height:1.82}.depth-no{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:28px;padding:0 9px;border-radius:999px;background:var(--primary-soft);color:var(--gold-deep);font-weight:800;font-size:.78rem;letter-spacing:.08em}.depth-actions{display:flex;gap:20px;flex-wrap:wrap;margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}.text-link{color:var(--gold-deep);font-weight:700;text-decoration:none}.text-link:hover{color:var(--primary)}
@media(max-width:1000px){.depth-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.depth-grid{grid-template-columns:1fr}.depth-card{padding:20px 18px}.depth-actions{gap:12px;flex-direction:column}}

.context-notes{margin-top:22px;padding:22px;border-radius:var(--radius-card);background:rgba(255,255,255,.72);border:1px solid rgba(229,57,53,.09)}.context-notes h3{margin:0 0 14px;color:var(--gold-deep);font-size:1.05rem}.context-note-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.context-note-grid p{margin:0;padding-left:16px;border-left:3px solid var(--primary-light);color:var(--text-2);line-height:1.85}@media(max-width:700px){.context-note-grid{grid-template-columns:1fr}}