:root{--primary:#2563eb;--primary-hover:#1d4ed8;--text-dark:#0f172a;--text-muted:#64748b;--bg-light:#ffffff;--bg-section:#f8fafc;--border-color:#e2e8f0;--yt-text:#0f0f0f;--yt-muted:#606060;--radius-sm:8px;--radius-md:12px;--radius-lg:20px;--shadow-sm:0 1px 3px rgba(0,0,0,0.02);--shadow-md:0 10px 25px -5px rgba(0,0,0,0.05),0 8px 10px -6px rgba(0,0,0,0.03);--transition:all 0.2s ease-in-out}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,sans-serif;background-color:var(--bg-light);color:var(--text-dark);line-height:1.5;-webkit-font-smoothing:antialiased}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1rem 5%;border-bottom:1px solid var(--border-color);background:rgba(255,255,255,.8);backdrop-filter:blur(8px);top:0;z-index:1000}.navbar-brand{font-size:1.25rem;font-weight:800;color:var(--text-dark);text-decoration:none;display:flex;align-items:center;gap:.5rem;letter-spacing:-.02em}.navbar-brand i{color:red}.navbar-menu{display:flex;gap:2rem;list-style:none}.navbar-link{text-decoration:none;color:var(--text-muted);font-weight:500;font-size:.9rem;transition:var(--transition)}.navbar-link:hover{color:var(--primary)}.app-workspace{display:grid;grid-template-columns:440px 1fr;min-height:calc(100vh - 65px);max-width:1650px;margin:0 auto}.control-sidebar{padding:2.5rem 2rem;border-right:1px solid var(--border-color);background:var(--bg-light);overflow-y:auto;position:sticky;top:65px;height:calc(100vh - 65px)}.app-title{font-size:1.65rem;font-weight:800;letter-spacing:-.03em;color:var(--text-dark);line-height:1.25;margin-bottom:.5rem}.app-tagline{font-size:.95rem;color:var(--text-muted);margin-bottom:2rem}.upload-zone{background:var(--bg-section);border:2px dashed #cbd5e1;border-radius:var(--radius-md);padding:2.5rem 1.5rem;text-align:center;cursor:pointer;transition:var(--transition);margin-bottom:1.5rem}.upload-zone.dragover,.upload-zone:hover{border-color:var(--primary);background:#f0f7ff;transform:scale(.99)}.upload-icon{font-size:2.25rem;color:var(--primary);margin-bottom:.75rem}.upload-text{font-size:.95rem;font-weight:600;color:var(--text-dark)}.upload-hint{font-size:.8rem;color:var(--text-muted);margin-top:.25rem}#file-input{display:none}.form-section-title{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.6rem;display:flex;align-items:center;gap:.5rem}.input-block{margin-bottom:1.25rem}.input-group{display:flex;background:var(--bg-section);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:.65rem .85rem;align-items:center;transition:var(--transition)}.input-group:focus-within{border-color:var(--primary);background:var(--bg-light);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.input-group i{color:var(--text-muted);margin-right:.75rem;font-size:.9rem}.input-field{border:none;outline:0;width:100%;font-family:inherit;font-size:.9rem;background:0 0;color:var(--text-dark)}.runtime-selector{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}.selector-btn{background:var(--bg-section);border:1px solid var(--border-color);padding:.5rem;border-radius:var(--radius-sm);font-family:inherit;font-size:.85rem;font-weight:500;color:var(--text-dark);cursor:pointer;transition:var(--transition);text-align:center}.selector-btn.active,.selector-btn:hover{background:var(--text-dark);color:#fff;border-color:var(--text-dark)}.preview-canvas-panel{background:var(--bg-section);padding:2.5rem;overflow-y:auto;height:calc(100vh - 65px);scroll-behavior:smooth}.canvas-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;border-bottom:1px solid var(--border-color);padding-bottom:1rem}.canvas-title{font-weight:700;font-size:1.1rem;color:var(--text-dark);display:flex;align-items:center;gap:.5rem}.preview-section{margin-bottom:3.5rem;background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2rem;box-shadow:var(--shadow-sm)}.preview-section-title{font-size:1rem;font-weight:700;color:var(--text-dark);margin-bottom:1.5rem;display:flex;align-items:center;gap:.5rem;border-left:4px solid var(--primary);padding-left:.75rem}.yt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px 16px}.yt-card{width:100%;display:flex;flex-direction:column}.yt-thumb-box{position:relative;width:100%;aspect-ratio:16/9;background:#e2e8f0;border-radius:var(--radius-md);overflow:hidden}.yt-image-layer{width:100%;height:100%;object-fit:cover;transition:opacity .2s ease-in-out}.yt-runtime-badge{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:3px 6px;font-size:11px;font-weight:500;border-radius:4px;font-family:Roboto,sans-serif;letter-spacing:.5px}.yt-meta-row{display:flex;margin-top:12px;gap:12px}.yt-avatar{width:36px;height:36px;border-radius:50%;background-color:#cbd5e1;background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2394a3b8"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 3c1.66 0 3 1.34 3 3s-1.34 3-3 3-3-1.34-3-3 1.34-3 3-3zm0 14.2c-2.5 0-4.71-1.28-6-3.22.03-1.99 4-3.08 6-3.08 1.99 0 5.97 1.09 6 3.08-1.29 1.94-3.5 3.22-6 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.yt-avatar{width:24px;height:24px}.yt-search-description{font-size:12px;color:var(--yt-muted);display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden;font-family:Roboto,sans-serif}.yt-sidebar-row{display:flex;gap:10px;max-width:400px}.yt-sidebar-row .yt-thumb-box{width:168px;flex-shrink:0}.yt-sidebar-row .yt-video-title{font-size:13px;line-height:18px;font-weight:500;margin-bottom:3px}.phone-shell{width:100%;max-width:360px;background:#fff;border:11px solid #0f172a;border-radius:36px;overflow:hidden;box-shadow:var(--shadow-md)}.phone-top-bar{height:28px;background:#0f172a;color:#fff;font-size:11px;display:flex;justify-content:space-between;padding:0 20px;align-items:center;font-weight:500}.phone-content{background:#fff}.phone-content .yt-thumb-box{border-radius:0}.phone-content .yt-meta-row{padding:12px}.yt-shorts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}.yt-shorts-box{position:relative;width:100%;aspect-ratio:9/16;background:#cbd5e1;border-radius:var(--radius-md);overflow:hidden}.yt-shorts-title{font-family:Roboto,sans-serif;font-size:13px;font-weight:500;line-height:18px;margin-top:8px;display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden;color:var(--yt-text)}.editorial-container{max-width:1150px;margin:0 auto;padding:5rem 1.5rem}.section-header{text-align:center;margin-bottom:3.5rem}.section-h2{font-size:2.25rem;font-weight:800;letter-spacing:-.03em;color:var(--text-dark)}.grid-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem;margin-bottom:4rem}.feature-node{border:1px solid var(--border-color);padding:2rem;border-radius:var(--radius-md);background:var(--bg-light);transition:var(--transition)}.feature-node:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.feature-icon{width:44px;height:44px;background:#eff6ff;color:var(--primary);display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);font-size:1.15rem;margin-bottom:1.25rem}.feature-node h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}.feature-node p{color:var(--text-muted);font-size:.9rem}.seo-rich-text{background:var(--bg-section);border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color);padding:5rem 1.5rem}.seo-inner-layout{max-width:840px;margin:0 auto;color:#334155}.seo-inner-layout h2{font-size:1.75rem;color:var(--text-dark);margin:2.5rem 0 1rem 0;font-weight:800}.seo-inner-layout p{margin-bottom:1.25rem;font-size:.95rem;line-height:1.75}.seo-inner-layout ul{margin:0 0 1.5rem 1.25rem}.seo-inner-layout li{margin-bottom:.5rem;font-size:.95rem}.accordion-stack{display:flex;flex-direction:column;gap:.75rem;max-width:840px;margin:0 auto}.accordion-node{border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-light);overflow:hidden}.accordion-head{width:100%;background:0 0;border:none;padding:1.25rem;text-align:left;font-size:1rem;font-weight:600;color:var(--text-dark);display:flex;justify-content:space-between;align-items:center;cursor:pointer}.accordion-head i{transition:var(--transition);color:var(--text-muted)}.accordion-body{max-height:0;overflow:hidden;transition:max-height .2s cubic-bezier(0,1,0,1)}.accordion-body-content{padding:0 1.25rem 1.25rem 1.25rem;color:var(--text-muted);font-size:.925rem;line-height:1.6}.accordion-node.open .accordion-head i{transform:rotate(180deg)}.accordion-node.open .accordion-body{max-height:400px;transition:max-height .2s cubic-bezier(1,0,1,0)}.footer-layer{border-top:1px solid var(--border-color);background:var(--bg-light);padding:4rem 1.5rem 2rem 1.5rem}.footer-grid{max-width:1150px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:3rem;margin-bottom:4rem}.footer-brand h3{font-size:1.1rem;font-weight:800;margin-bottom:1rem}.footer-brand p{font-size:.85rem;color:var(--text-muted);line-height:1.6}.footer-column h4{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:1rem;color:var(--text-dark)}.footer-links{list-style:none;display:flex;flex-direction:column;gap:.65rem}.footer-links a{text-decoration:none;color:var(--text-muted);font-size:.875rem;transition:var(--transition)}.footer-links a:hover{color:var(--primary)}.footer-base{max-width:1150px;margin:0 auto;padding-top:2rem;border-top:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;font-size:.85rem;color:var(--text-muted)}@media(max-width:1024px){.app-workspace{grid-template-columns:1fr}.control-sidebar{height:auto;position:static;border-right:none;border-bottom:1px solid var(--border-color)}.preview-canvas-panel{height:auto}}@media(max-width:768px){.navbar-menu{display:none}.yt-search-row{flex-direction:column}.yt-search-row .yt-thumb-box{width:100%;max-width:100%}.section-h2{font-size:1.75rem}}