/* 
 * NeoMeso - 公共样式表
 * 版本：1.0
 * 最后更新：2026-03-23
 * 说明：所有页面共享的公共样式
 */

/* ==================== CSS 变量 ==================== */
:root {
    /* 主题颜色 */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-secondary: #a0a0ff;
    --color-text: #fff;
    --color-text-muted: #a0a0c0;
    --color-text-light: #c0c0e0;
    --color-text-heading: #e0e0ff;
    --color-text-dim: #808090;
    
    /* 背景颜色 */
    --bg-gradient-start: #0f0c29;
    --bg-gradient-mid: #302b63;
    --bg-gradient-end: #24243e;
    
    /* 玻璃态效果 */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-bg-hover: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(102, 126, 234, 0.5);
    --glass-blur: 10px;
    
    /* 阴影 */
    --shadow-sm: 0 4px 20px rgba(102, 126, 234, 0.3);
    --shadow-md: 0 10px 30px rgba(102, 126, 234, 0.3);
    --shadow-lg: 0 20px 60px rgba(102, 126, 234, 0.3);
    --shadow-xl: 0 15px 40px rgba(102, 126, 234, 0.4);
    
    /* 间距 */
    --spacing-xs: 10px;
    --spacing-sm: 20px;
    --spacing-md: 30px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* 圆角 */
    --radius-sm: 15px;
    --radius-md: 20px;
    --radius-lg: 25px;
    --radius-xl: 30px;
    
    /* 字体 */
    --font-family: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', sans-serif;
    
    /* 过渡 */
    --transition-fast: 0.3s ease;
    --transition-normal: 0.5s ease;
    --transition-slow: 1s ease-out;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 12, 41, 0.9);
    backdrop-filter: blur(10px);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-logo {
    font-size: 1.5em;
    font-weight: bold;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: 4px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--color-secondary);
    text-decoration: none;
    font-size: 0.95em;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
}

.nav-link.active {
    color: var(--color-text);
    font-weight: bold;
}

/* ==================== 通用 Hero 区域 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
}

/* ==================== 页面标题 ==================== */
.page-title {
    font-size: 3em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1.3em;
    color: var(--color-secondary);
    margin-bottom: 60px;
}

/* ==================== 返回链接 ==================== */
.back-link {
    display: inline-block;
    margin-bottom: 40px;
    color: var(--color-primary);
    text-decoration: none;
    font-size: 1em;
    transition: all var(--transition-fast);
}

.back-link:hover {
    color: var(--color-secondary);
    transform: translateX(-5px);
}

/* ==================== 章节标题 ==================== */
.section-title {
    font-size: 2.2em;
    text-align: center;
    margin-bottom: 50px;
    color: var(--color-text-heading);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    margin: 15px auto 0;
}

.section-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
    margin: 80px 0;
}

/* ==================== 卡片通用样式 ==================== */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 40px;
    transition: all var(--transition-fast);
    text-align: center;
}

.card:hover {
    transform: translateY(-10px);
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 4em;
    margin-bottom: 20px;
}

.card-logo {
    width: 100px;
    height: 100px;
    object-fit: contain;
    margin-bottom: 20px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
    border: 2px solid rgba(102, 126, 234, 0.4);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.2),
                inset 0 0 20px rgba(102, 126, 234, 0.05);
    padding: 8px;
    transition: all var(--transition-fast);
}

.card-logo:hover {
    border-color: rgba(102, 126, 234, 0.7);
    box-shadow: 0 12px 48px rgba(102, 126, 234, 0.35),
                inset 0 0 30px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.card-title {
    font-size: 1.8em;
    color: var(--color-text-heading);
    margin-bottom: 15px;
}

.card-desc {
    font-size: 1em;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 20px;
}

.card-features {
    list-style: none;
    padding: 0;
    text-align: left;
}

.card-features li {
    padding: 10px 0;
    color: var(--color-text-light);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.95em;
}

.card-features li:last-child {
    border-bottom: none;
}

.card-features li::before {
    content: '✓ ';
    color: var(--color-primary);
    margin-right: 8px;
    font-weight: bold;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: 15px 40px;
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-size: 1.05em;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

/* ==================== 页脚 ==================== */
.footer {
    padding: 40px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
}

.footer p {
    color: var(--color-text-dim);
    font-size: 0.9em;
    margin: 8px 0;
}

/* ==================== 网格布局 ==================== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto 60px;
    padding: 0 20px;
}

.flex {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .navbar {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        gap: 20px;
    }
    
    .page-title {
        font-size: 2em;
    }
    
    .page-subtitle {
        font-size: 1.1em;
    }
}