:root{--primary: #0f172a;--primary-light: #1e293b;--accent: #f97316;--accent-hover: #ea580c;--accent-subtle: #fff7ed;--surface: #ffffff;--surface-elevated: #f8fafc;--border: #e2e8f0;--border-hover: #cbd5e1;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--success: #10b981;--success-bg: #ecfdf5;--error: #ef4444;--error-bg: #fef2f2;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--transition: .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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#f973161a}.search-input::placeholder{color:var(--text-muted)}.search-clear{position:absolute;right:.75rem;background:none;border:none;color:var(--text-muted);font-size:1.25rem;cursor:pointer;padding:.25rem;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all var(--transition)}.search-clear:hover{background:var(--surface-elevated);color:var(--text-secondary)}.search-charcount{font-size:.75rem;color:var(--text-muted);text-align:right;margin-top:.375rem}.search-charcount--warning{color:var(--accent)}.search-charcount--limit{color:var(--error)}.demo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1.25rem}.demo-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;transition:all 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#fecaca;border-radius:var(--radius-lg);padding:1.5rem;display:flex;align-items:center;gap:1rem}.error-icon{font-size:1.5rem;flex-shrink:0}.error-content{flex:1}.error-message{font-size:.9rem;color:#991b1b;font-weight:500}.error-action{margin-top:.75rem}.auth-loading{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem;background:linear-gradient(135deg,#0f172a,#1e3a5f,#0f172a);color:#fff}.auth-loading__text{font-size:1rem;color:#cbd5e1}.category-tab{padding:.5rem 1.25rem;font-size:.85rem;font-weight:500;color:var(--text-secondary);background:var(--surface);border:1px solid var(--border);border-radius:9999px;cursor:pointer;transition:all 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var(--transition);line-height:1}.modal-close:hover{background:var(--surface-elevated);color:var(--text-primary)}.modal-video{padding:1.5rem;background:#000}.video-player{width:100%;max-height:450px;border-radius:var(--radius-md);outline:none}.video-loading,.video-error{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem;gap:1rem;color:#fff}.video-error p{color:#fca5a5}.video-filename{margin:.75rem 0 0;font-size:.8rem;color:#9ca3af;text-align:center}.modal-no-video{padding:2rem;text-align:center;color:var(--text-muted);background:var(--surface-elevated)}.modal-description{padding:1.25rem 1.5rem;color:var(--text-secondary);font-size:.9rem;line-height:1.6;border-bottom:1px solid var(--border)}.modal-artifacts{padding:1.25rem 1.5rem}.modal-section-title{font-size:.9rem;font-weight:600;color:var(--primary);margin:0 0 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