/* 重置样式和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background-color: #0066cc;
    color: white;
    border-color: #0066cc;
}

.btn-primary:hover {
    background-color: #0052a3;
    border-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: #0066cc;
    border-color: #0066cc;
}

.btn-secondary:hover {
    background-color: #0066cc;
    color: white;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: #0066cc;
    border-color: #0066cc;
}

.btn-outline:hover {
    background-color: #0066cc;
    color: white;
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-extra-large {
    padding: 20px 40px;
    font-size: 20px;
    font-weight: 700;
}

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

/* 响应式基础 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 16px;
    }
    
    .btn-extra-large {
        padding: 16px 32px;
        font-size: 18px;
    }
}