*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:#14213d;background:#f6f8fb;line-height:1.7}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}button,input,textarea{font:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid #e6edf5}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:1220px;margin:0 auto;padding:12px 20px}.brand-logo,.footer-logo{display:inline-flex;align-items:center}.domain-pill{padding:8px 14px;border:1px solid #dbe7f4;border-radius:999px;background:#f9fbff;color:#43536b;font-size:14px}.main-nav{max-width:1220px;margin:0 auto;padding:0 20px 12px;display:flex;gap:10px;flex-wrap:wrap}.main-nav a{padding:8px 13px;border-radius:999px;color:#35445f;background:#eef4fb;font-weight:700;font-size:14px}.main-nav a.active,.main-nav a:hover{background:#1d4ed8;color:white}.search-wrap{max-width:1220px;margin:0 auto;padding:0 20px 14px}.search-wrap form{display:flex;gap:10px}.search-wrap input{flex:1;border:1px solid #d8e3f0;background:white;border-radius:16px;padding:13px 16px;outline:none}.search-wrap input:focus{border-color:#1d4ed8;box-shadow:0 0 0 4px rgba(29,78,216,.1)}.search-wrap button,.primary-btn,.secondary-btn,.stats button,.btn-link,.form-panel button{border:0;border-radius:14px;padding:12px 16px;font-weight:800;cursor:pointer}.search-wrap button,.primary-btn,.form-panel button{background:#1d4ed8;color:white}.secondary-btn,.stats button,.btn-link{background:#e8f0ff;color:#1d4ed8}.search-tip{margin:8px 0 0;color:#526174;font-size:14px}main{max-width:1220px;margin:0 auto;padding:24px 20px 48px}.hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);gap:24px;align-items:stretch}.hero-copy,.hero-panel,.page-hero,.section-block,.module-card,.video-card,.author-card,.category-card,.comment-card,.contact-card,.form-panel,.timeline article,.info-list article,.steps article{background:white;border:1px solid #e3eaf3;border-radius:28px;box-shadow:0 16px 50px rgba(20,33,61,.06)}.hero-copy{padding:44px;background:linear-gradient(135deg,#ffffff 0%,#eef6ff 58%,#e8fbff 100%)}.hero h1,.page-hero h1{font-size:clamp(32px,5vw,56px);line-height:1.12;margin:12px 0 18px;color:#0f1f3d}.hero p,.page-hero p{font-size:18px;color:#4b5d75;max-width:760px}.eyebrow{display:inline-flex;align-items:center;width:max-content;max-width:100%;padding:5px 10px;border-radius:999px;background:#eaf2ff;color:#1d4ed8;font-size:13px;font-weight:800}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}.trust-list{display:flex;flex-wrap:wrap;gap:10px}.trust-list span{padding:7px 12px;background:white;border:1px solid #dce8f5;border-radius:999px;color:#42506a}.hero-panel{padding:24px}.hero-panel h2{margin-top:0}.rank-item{display:grid;grid-template-columns:52px 1fr;gap:4px 12px;padding:14px 0;border-bottom:1px solid #edf2f7}.rank-item span{grid-row:span 2;display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:#1d4ed8;color:white;font-weight:900}.rank-item small{color:#68778d}.section-block{padding:28px;margin-top:24px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:20px}.section-heading.inline{display:block}.section-heading h2,.module-card h3,.author-card h3,.author-card h2,.category-card strong,.contact-card h2{margin:8px 0;color:#0f1f3d}.section-heading p,.module-card p,.video-body p,.author-card p,.category-card span,.comment-card p,.info-list p,.steps p{color:#53657d}.section-heading>a,.more-link{color:#1d4ed8;font-weight:900}.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.video-card{overflow:hidden}.video-cover{position:relative;display:block;aspect-ratio:16/9;background:#d9e5f3;overflow:hidden}.video-cover img,.preview-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.preview-video{opacity:0}.play-button{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;min-width:64px;height:64px;padding:0 18px;border-radius:999px;background:rgba(255,255,255,.9);color:#1d4ed8;font-weight:900;box-shadow:0 12px 32px rgba(15,31,61,.2);opacity:0;transition:.2s}.video-cover:hover .play-button{opacity:1}.duration{position:absolute;right:12px;bottom:12px;padding:5px 9px;border-radius:999px;background:rgba(15,31,61,.74);color:white;font-size:12px}.video-body{padding:18px}.tag-row{display:flex;gap:8px;flex-wrap:wrap}.tag-row span{font-size:12px;color:#1d4ed8;background:#edf4ff;border-radius:999px;padding:4px 8px;font-weight:800}.video-body h3{line-height:1.45;margin:12px 0 8px}.image-desc{font-size:13px;background:#f8fafc;border:1px dashed #d6e1ec;border-radius:14px;padding:10px}.meta-grid{display:grid;grid-template-columns:1fr;gap:4px;font-size:13px;color:#627188;border-top:1px solid #edf2f7;padding-top:12px}.stats{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.stats.compact{align-items:center}.stats.compact span{padding:8px 10px;background:#f4f7fb;border-radius:999px;color:#53657d}.module-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.module-card{padding:20px;display:flex;flex-direction:column;justify-content:space-between;min-height:278px}.module-card ul{padding-left:20px;color:#4c5f78}.category-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.category-card{display:flex;flex-direction:column;padding:18px;gap:8px}.category-card:hover,.module-card:hover,.author-card:hover,.video-card:hover{transform:translateY(-2px);transition:.18s;box-shadow:0 20px 60px rgba(20,33,61,.09)}.category-card em{font-style:normal;color:#1d4ed8;font-weight:900}.author-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.author-card{padding:16px}.author-card img{border-radius:20px;aspect-ratio:16/9;object-fit:cover}.subtitle{font-weight:700}.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px}.faq-list details{background:#f8fbff;border:1px solid #e0e8f2;border-radius:18px;padding:14px 16px;margin-bottom:10px}.faq-list summary{font-weight:900;cursor:pointer}.comment-list{display:grid;gap:12px}.comment-card{padding:16px}.comment-card span{font-size:13px;color:#6a7a90}.contact-strip{display:flex;align-items:center;justify-content:space-between;gap:20px;background:linear-gradient(135deg,#102a63,#1d4ed8);color:white}.contact-strip h2,.contact-strip p{color:white}.contact-strip .eyebrow{background:rgba(255,255,255,.16);color:white}.breadcrumb{font-size:14px;color:#64748b;margin:0 0 16px}.breadcrumb a{font-weight:800;color:#1d4ed8}.page-hero{padding:36px;margin-bottom:24px;background:linear-gradient(135deg,#fff,#f0f7ff)}.domain-note{padding:12px 14px;background:#f8fbff;border-radius:16px;border:1px solid #e4edf7}.steps,.info-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.info-list.single{grid-template-columns:1fr}.steps article,.info-list article{padding:18px}.steps span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:#1d4ed8;color:white;font-weight:900}.form-panel form{display:grid;gap:14px}.form-panel label{display:grid;gap:6px;font-weight:800;color:#334155}.form-panel input,.form-panel textarea{border:1px solid #d9e5f1;border-radius:14px;padding:12px;min-height:46px}.form-panel textarea{min-height:120px}.timeline{display:grid;gap:14px}.timeline article{padding:18px;border-left:6px solid #1d4ed8}.timeline time{font-weight:900;color:#1d4ed8}.contact-card{padding:24px}.site-footer{background:#0f1f3d;color:#d7e2f1;margin-top:30px}.footer-grid{max-width:1220px;margin:0 auto;padding:34px 20px;display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:28px}.site-footer h2{font-size:18px;color:white}.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:8px}.footer-links a{color:#eaf2ff}.copyright{border-top:1px solid rgba(255,255,255,.12);text-align:center;padding:14px 20px;color:#c9d6e6}.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(24px);background:#0f1f3d;color:white;padding:12px 18px;border-radius:999px;opacity:0;pointer-events:none;transition:.2s;z-index:40;box-shadow:0 18px 50px rgba(0,0,0,.25)}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}.ad-placeholder{display:none}@media (max-width:1024px){.hero,.two-columns{grid-template-columns:1fr}.video-grid,.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.author-grid,.category-grid,.steps,.info-list,.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:680px){.topbar,.section-heading,.contact-strip{align-items:flex-start;flex-direction:column}.search-wrap form{flex-direction:column}.hero-copy{padding:28px}.video-grid,.module-grid,.author-grid,.category-grid,.steps,.info-list,.footer-grid{grid-template-columns:1fr}.main-nav{overflow-x:auto;flex-wrap:nowrap}.main-nav a{white-space:nowrap}.site-header{position:static}}