/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 卡片样式 */
.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 16px;
    font-size: 1.8rem;
}

.card h3 {
    color: #34495e;
    margin-bottom: 16px;
    font-size: 1.4rem;
}

.card p {
    margin-bottom: 16px;
    color: #555;
}

/* 按钮样式 */
button {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

button:active {
    transform: translateY(0);
}

/* 计数器样式 */
.counter {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

#count {
    font-size: 2rem;
    font-weight: bold;
    color: #007bff;
    min-width: 60px;
    text-align: center;
}

/* 列表样式 */
ul {
    list-style: none;
    padding: 0;
}

ul li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

ul li:last-child {
    border-bottom: none;
}

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

    header h1 {
        font-size: 2rem;
    }

    .card {
        padding: 16px;
    }

    .counter {
        flex-direction: column;
        gap: 10px;
    }

    #count {
        font-size: 1.5rem;
    }
}