:root { --bg: #0a0a0a; --accent: #ffffff; --panel: #151515; }
        body, html { margin: 0; padding: 0; width: 100%; height: 100%; background: var(--bg); color: white; font-family: 'Inter', sans-serif; overflow: hidden; }

        .app-container {
            display: grid;
            grid-template-columns: 160px 1fr 220px;
            height: 100vh;
            width: 100vw;
        }

        /* Sidebar: Frames */
        .sidebar-frames {
            background: var(--panel);
            border-right: 1px solid #333;
            overflow-x: hidden;
            overflow-y: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            
            display: flex;
            flex-direction: column;
            gap: 15px;
            padding: 15px;
            transition: all 0.4s ease;
            filter: grayscale(1) blur(2px);
            pointer-events: none; /* Locked initially */
        }
        .sidebar-frames::-webkit-scrollbar {
            display: none;
        }
        .sidebar-frames.unlocked {
            filter: none;
            pointer-events: auto;
        }

        .frame-thumb {
            width: 100%; aspect-ratio: 2/3;
            border: 3px solid #333;
            cursor: pointer;
            object-fit: cover;
            border-radius: 4px;
        }
        .frame-thumb.selected { border-color: var(--accent); transform: scale(1.02); }

        /* Main Viewport */
        .viewport {
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: #000;
        }

        .camera-container {
            position: relative;
            width: 85%;
            max-height: 70%;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        #camera-view { width: auto; height: auto; max-width: 100%; max-height: 100%; border-radius: 12px; transform: scaleX(-1); }
        #final-canvas { display: none; max-height: 85vh; max-width: 90%; box-shadow: 0 0 50px rgba(0,0,0,0.8); }

        .controls { margin-top: 25px; display: flex; gap: 15px; z-index: 10; }
        button {
            background: var(--accent); color: #000; border: none;
            padding: 14px 28px; font-weight: bold; border-radius: 8px; cursor: pointer;
            text-transform: uppercase; letter-spacing: 1px;
        }
        
        /* Filters */
        .sidebar-filters { background: var(--panel); border-left: 1px solid #333; padding: 20px; }
        .filter-btn {
            width: 100%; margin-bottom: 10px; background: #252525; color: #fff;
            padding: 12px; border: 1px solid #444; cursor: pointer; border-radius: 6px;
        }
        .filter-btn.active { background: var(--accent); color: #000; border-color: var(--accent); }

        /* Effects */
        #flash { position: fixed; inset: 0; background: white; opacity: 0; pointer-events: none; z-index: 9999; }
        .countdown {
            position: absolute; font-size: 12rem; color: white;
            font-weight: 900; z-index: 100; pointer-events: none;
        }

        #camera-guide {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border: 2px dashed rgba(255, 255, 255, 0.5);
            box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.8);
            z-index: 5;
            pointer-events: none;
            display: none;
            border-radius: 12px;
        }

        #selection-screen {
            position: absolute;
            inset: 0;
            background: rgba(10, 10, 10, 0.95);
            z-index: 20;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 20px;
            display: none; 
        }

        #selection-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
            width: 80%;
            max-width: 700px;
        }

        .selection-thumb {
            width: 100%;
            aspect-ratio: 0.923;
            object-fit: cover;
            border: 4px solid #555;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .selection-thumb.selected {
            border-color: var(--accent);
            transform: scale(1.05);
            box-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
        }

        .selection-number {
            position: absolute;
            top: 8px; left: 8px;
            width: 24px; height: 24px;
            background: var(--accent); color: #000;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-weight: bold; font-size: 12px;
            z-index: 10; pointer-events: none;
            box-shadow: 0 2px 4px rgba(0,0,0,0.5);
        }