:root,[data-theme=dark]{--bg-dark: #0f172a;--bg-sidebar: #020617;--bg-header: #0f172a;--bg-input: #0f172a;--bg-card: #1e293b;--bg-button: #1e293b;--bg-button-hover: #334155;--text-main: #f8fafc;--text-muted: #94a3b8;--primary: #6366f1;--primary-glow: rgba(99, 102, 241, .15);--border: #334155;--user-bubble: #4f46e5;--accent-gold: #fbbf24;--shadow-color: rgba(0, 0, 0, .3)}[data-theme=light]{--bg-dark: #f1f5f9;--bg-sidebar: #e2e8f0;--bg-header: #ffffff;--bg-input: #ffffff;--bg-card: #ffffff;--bg-button: #cbd5e1;--bg-button-hover: #94a3b8;--text-main: #0f172a;--text-muted: #475569;--primary: #4f46e5;--primary-glow: rgba(79, 70, 229, .15);--border: #94a3b8;--user-bubble: #4f46e5;--accent-gold: #d97706;--shadow-color: rgba(0, 0, 0, .15)}html,body,#root{height:100%;width:100%;margin:0;padding:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-dark);color:var(--text-main);overflow:hidden}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe 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20px}}@media(max-width:850px){.demo-wrapper{flex-direction:column;align-items:stretch;gap:30px}.steps-list{min-width:100%}.mockup-container{max-width:100%;height:400px;margin:0 auto}}@media(max-width:768px){.grid-3{grid-template-columns:1fr;padding:0 10px}.opensource-card{padding:20px}.section-heading{font-size:1.5rem}}@media(max-width:480px){.auth-card{width:90%;padding:20px}.auth-back-btn{top:15px;left:15px;font-size:.8rem}.auth-card img{height:35px!important}.auth-card div[style*="height: 40px"]{height:30px!important}.auth-card div[style*="width: 80px"]{width:60px!important;height:60px!important}}.notebook-panel{width:350px;border-left:1px solid var(--border);background:#09090b;display:flex;flex-direction:column;height:100%;flex-shrink:0;transition:transform .3s ease;z-index:40}@media(max-width:1100px){.notebook-panel{position:absolute;right:0;top:0;bottom:0;border-left:1px solid #334155;box-shadow:-10px 0 30px #00000080}}@media(max-width:600px){.notebook-panel{width:100%}}.auth-back-btn{position:absolute;top:30px;left:30px;background:transparent;border:none;color:#64748b;font-size:.95rem;font-weight:600;display:flex;align-items:center;gap:8px;cursor:pointer;z-index:50;transition:all .2s;padding:8px 12px;border-radius:8px}.auth-back-btn:hover{color:#fff;background:#ffffff0d}.settings-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000}.settings-modal{background:var(--bg-card, #1e293b);border-radius:16px;width:90%;max-width:420px;max-height:80vh;overflow-y:auto;box-shadow:0 25px 50px -12px var(--shadow-color);border:1px solid var(--border)}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--border)}.settings-header h2{margin:0;font-size:1.25rem;font-weight:600;color:var(--text-main)}.settings-close-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:8px;border-radius:8px;transition:all .2s}.settings-close-btn:hover{background:var(--primary-glow);color:var(--primary)}.settings-content{padding:24px}.settings-section h3{margin:0 0 8px;font-size:1rem;font-weight:600;color:var(--text-main)}.settings-description{margin:0 0 16px;font-size:.875rem;color:var(--text-muted);line-height:1.5}.theme-selector{display:flex;gap:8px}.theme-option{flex:1;display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 12px;background:transparent;border:2px solid var(--border);border-radius:12px;color:var(--text-muted);cursor:pointer;transition:all .2s}.theme-option:hover{border-color:var(--primary);color:var(--primary)}.theme-option.active{border-color:var(--primary);background:var(--primary-glow);color:var(--primary)}.theme-option span{font-size:.85rem;font-weight:500}.theme-hint{font-size:.7rem;opacity:.7}.settings-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:8px;border-radius:8px;transition:all .2s;display:flex;align-items:center;justify-content:center}.settings-btn:hover{background:var(--primary-glow);color:var(--primary)}.video-widget{margin-top:16px;padding:12px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px}.video-widget-header{display:flex;align-items:center;gap:8px;font-size:.85rem;font-weight:600;color:var(--primary);margin-bottom:8px}.video-pulse{width:8px;height:8px;background:var(--primary);border-radius:50%;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(1.2)}}.video-link-card{display:flex;align-items:center;padding:12px;background:var(--primary-glow);border-radius:8px;text-decoration:none;color:var(--text-main);gap:12px;transition:all .2s ease;border:1px solid transparent}.video-link-card:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.video-icon{font-size:2rem}.video-info{flex:1}.video-title{font-weight:600;color:var(--text-main)}.video-link-card:hover .video-title{color:#fff}.video-subtitle{font-size:.8rem;color:var(--text-muted)}.video-link-card:hover .video-subtitle{color:#fffc}