* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #0c0c0c 0%, #1a1a1a 100%);
            color: #fff;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            position: relative;
        }
        
        .container {
            text-align: center;
            max-width: 800px;
            padding: 2rem;
            z-index: 10;
            position: relative;
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 2rem;
            text-shadow: 0 0 10px rgba(255, 0, 0, 0.7);
            letter-spacing: 1px;
            animation: glow 2s infinite alternate;
        }
        
        @keyframes glow {
            from {
                text-shadow: 0 0 10px rgba(255, 0, 0, 0.7);
            }
            to {
                text-shadow: 0 0 20px rgba(255, 0, 0, 1), 0 0 30px rgba(255, 50, 50, 0.5);
            }
        }
        
        .subtitle {
            font-size: 1.2rem;
            margin-bottom: 3rem;
            color: #a0a0a0;
        }
        
        .btn {
            background: linear-gradient(45deg, #ff0000, #cc0000);
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            font-size: 1.2rem;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(255, 0, 0, 0.4);
            font-weight: bold;
            letter-spacing: 1px;
        }
        
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 0, 0, 0.6);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .message {
            font-size: 2rem;
            margin-top: 2rem;
            min-height: 100px;
            display: flex;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.5s ease;
            font-weight: bold;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }
        
        .message.show {
            opacity: 1;
        }
        
        .countdown {
            font-size: 5rem;
            font-weight: bold;
            margin: 2rem 0;
            opacity: 0;
            transform: scale(0);
            transition: all 0.3s ease;
            text-shadow: 0 0 20px rgba(255, 255, 255, 0.7);
        }
        
        .countdown.show {
            opacity: 1;
            transform: scale(1);
        }
        
        .pulse {
            animation: pulse 0.5s ease infinite alternate;
        }
        
        @keyframes pulse {
            from {
                transform: scale(1);
            }
            to {
                transform: scale(1.1);
            }
        }
        
        .shake {
            animation: shake 0.5s ease infinite;
        }
        
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-10px); }
            75% { transform: translateX(10px); }
        }
        

        
        @keyframes heartbeat {
            0% { transform: scale(1); }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); }
        }
        
        .hidden {
            display: none;
        }
        
        .background-elements {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }
        
        .floating {
            position: absolute;
            background: rgba(255, 0, 0, 0.1);
            border-radius: 50%;
            animation: float 15s infinite linear;
        }
        
        @keyframes float {
            0% {
                transform: translateY(0) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-1000%) rotate(360deg);
                opacity: 0;
            }
        }
        
        .crack {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cpath d='M10,10 L90,90 M30,10 L70,90 M50,10 L50,90 M10,30 L90,70 M10,50 L90,50' stroke='rgba(255,0,0,0.1)' stroke-width='1' fill='none'/%3E%3C/svg%3E");
            opacity: 0;
            transition: opacity 0.5s ease;
            pointer-events: none;
        }
        
        .crack.show {
            opacity: 1;
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            
            .countdown {
                font-size: 4rem;
            }
            
            .message {
                font-size: 1.5rem;
            }
        }