/**
 * 公共样式文件 - 前台所有页面通用样式
 * 包含：全局变量、基础样式、按钮、表单、卡片、响应式等
 */

/* ==================== 全局样式变量 ==================== */
:root {
    --primary-color: #6a11cb;
    --secondary-color: #2575fc;
    --accent-color: #ff6b6b;
    --success-color: #51cf66;
    --text-dark: #1a1a1a;
    --text-gray: #666;
    --text-light: #999;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.2);
}

/* ==================== 全局基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

ul {
    list-style: none;
}

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

.section {
    padding: 80px 0;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(106, 17, 203, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(106, 17, 203, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 15px 40px;
    font-size: 18px;
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* ==================== 卡片样式 ==================== */
.card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

/* ==================== 徽章样式 ==================== */
.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

/* ==================== 分隔线 ==================== */
.divider {
    height: 1px;
    background: #eee;
    margin: 40px 0;
}

/* ==================== 文本样式 ==================== */
.text-center {
    text-align: center;
}

.text-gradient {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== 响应式工具类 ==================== */
@media (max-width: 968px) {
    .section {
        padding: 60px 0;
    }

    .btn-large {
        padding: 12px 30px;
        font-size: 16px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 40px 0;
    }

    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        padding: 12px 20px;
    }

    .btn-large {
        padding: 14px 20px;
        font-size: 16px;
    }
}

/* ==================== 页面头部样式 ==================== */
.page-header {
    text-align: center;
    margin-bottom: 60px;
}

.page-header h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.page-header p {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== 内容区域样式 ==================== */
.content-section {
    background: white;
    border-radius: 12px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.content-section h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-section p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 15px;
}

/* ==================== 列表样式 ==================== */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 15px 0;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: "✓";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 700;
}

/* ==================== 响应式辅助类 ==================== */
.mobile-only {
    display: none;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block;
    }

    .desktop-only {
        display: none;
    }
}