:root {
            /* Palette: Đỏ sâu và Vàng ánh kim */
            --gold: linear-gradient(135deg, #bf953f, #fcf6ba, #b38728, #fbf5b7, #aa771c);
            --red-bg: radial-gradient(circle at center, #8b0000 0%, #3a0000 100%);
            --glass: rgba(255, 255, 255, 0.1);
            --glass-border: rgba(255, 255, 255, 0.2);
        }

        body {
            font-family: 'Montserrat', sans-serif;
            background: var(--red-bg);
            color: #fff;
            margin: 0;
            padding: 0;
            line-height: 1.6;
            overflow-x: hidden;
        }
        /* --- Hiệu ứng AI Background Canvas --- */
        #ai-canvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            background: radial-gradient(circle at center, #6a0000 0%, #1a0000 100%);
        }

        /* Header sang trọng */
        header {
            padding: 50px 20px 20px;
            text-align: center;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 900;
            margin: 0;
            color: #fcf6ba;
            text-transform: uppercase;
            background: var(--gold);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            filter: drop-shadow(0 2px 10px rgba(0,0,0,0.5));
            letter-spacing: 2px;
        }

        .tagline {
            color: #fcf6ba;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 3px;
            margin-top: 5px;
        }

        .container {
            padding: 20px;
            max-width: 500px;
            margin: 0 auto;
        }

        /* Thẻ gương (Glass Card) */
        .glass-card {
            background: var(--glass);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border: 1px solid var(--glass-border);
            border-radius: 25px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        h2 {
            font-size: 1.2rem;
            margin-top: 0;
            color: #fcf6ba;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid rgba(252, 246, 186, 0.2);
            padding-bottom: 10px;
        }

        /* Nút kiểu gương trong suốt */
        .btn-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .glass-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 20px;
            padding: 20px 10px;
            text-decoration: none;
            color: #fff;
            font-weight: bold;
            display: flex;
            flex-direction: column;
            align-items: center;
            transition: all 0.3s;
            text-align: center;
            animation: moveGradient 3s linear infinite;
            box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
        }

        .glass-btn:active {
            transform: scale(0.95);
            background: rgba(255, 255, 255, 0.15);
        }
        /* Container tạo viền phát sáng chạy vòng */
        .glow-border-box {
            position: relative;
            padding: 1px; /* Độ dày viền */
            background: linear-gradient(90deg, #f5c938, #ffd700, #eb7406);
            background-size: 200% auto;
            border-radius: 20px;
            animation: moveGradient 3s linear infinite;
            box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
        }

        @keyframes moveGradient {
            0% { background-position: 0% 50%; }
            100% { background-position: 200% 50%; }
        }

        .glass-btn i {
            font-size: 1.5rem;
            margin-bottom: 8px;
            display: block;
        }

        /* Tính năng */
        .feature-list {
            text-align: left;
        }
        .feature-item {
            margin-bottom: 15px;
            padding-left: 15px;
            border-left: 2px solid #bf953f;
        }
        .feature-item strong { color: #fcf6ba; display: block; }
        .feature-item p { margin: 0; font-size: 0.85rem; color: #ddd; }

        /* Carousel ảnh */
        .screenshot-container {
            display: flex;
            gap: 10px;
            overflow-x: auto;
            padding-bottom: 10px;
            scroll-snap-type: x mandatory;
        }
        .screenshot-container::-webkit-scrollbar { display: none; }
        .screenshot-container img {
            width: 140px;
            height: 240px;
            border-radius: 15px;
            border: 1px solid var(--gold);
            object-fit: cover;
            scroll-snap-align: start;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 40px 20px 100px;
            font-size: 0.8rem;
            color: #aaa;
        }
        footer a { color: #fcf6ba; text-decoration: none; }