/* ==================== 全局重置与基础样式 ==================== */
*, *::before, *::after {
    /* 确保 padding 和 border 不会增加元素的总宽度 */
    box-sizing: border-box; 
}

:root {
    /* 定义颜色变量，便于维护 */
    --primary-color: #007bff; 
    --secondary-color: #28a745; 
    --text-color: #333;
    --background-color: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px; /* 确保 body 在边缘留有空间 */
    background-color: var(--background-color);
    text-align: center;
    color: var(--text-color);
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    max-width: 550px; 
    width: 100%; 
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease-out forwards;
}

h1 {
    color: var(--primary-color);
    font-size: 32px;
    margin-bottom: 10px;
}

/* 突出新域名的区域 */
.domain-change-box {
    background-color: #e9ecef;
    border-radius: 8px;
    padding: 20px 15px;
    margin: 25px 0;
}

.old-domain {
    color: #888;
    font-size: 1.1em;
    display: block;
    margin-bottom: 5px;
}

.new-domain-wrapper {
    font-size: 1.8em; 
    font-weight: 700;
    color: var(--secondary-color);
    margin: 10px 0;
}

.arrow {
    color: var(--primary-color);
    font-size: 1.5em;
    margin: 0 10px;
}

/* ==================== 按钮样式优化 ==================== */
.jump-button {
    display: block; 
    margin: 25px auto; 
    
    width: 90%; 
    max-width: 380px; 

    padding: 15px 30px;
    font-size: 20px;
    font-weight: 600;
    color: #ffffff;
    
    background: linear-gradient(45deg, var(--primary-color) 0%, #0056b3 100%);
    border: none;
    border-radius: 50px; 
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: pulse 1.8s infinite;
}

.jump-button:hover {
    background: linear-gradient(45deg, #0056b3 0%, var(--primary-color) 100%);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

#countdown {
    margin-top: 25px;
    font-size: 16px;
    color: #6c757d;
}

/* ==================== 关键帧动画 ==================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 123, 255, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(0, 123, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 123, 255, 0); }
}

/* ==================== 响应式设计 (手机端优化) ==================== */
@media (max-width: 768px) {
    body {
        padding: 10px; 
    }

    .container {
        padding: 30px 20px; 
        box-shadow: none; 
    }

    h1 {
        font-size: 24px;
    }
    
    .new-domain-wrapper {
        font-size: 1.4em; 
    }

    .jump-button {
        width: 100%; 
        max-width: 100%; 
        font-size: 18px;
    }
}