/**
 * 目录页面样式
 * 仅包含 catalog.html 所需的样式
 */

/* CSS 变量 */
:root {
    --primary-color: #FF8C94;
    --secondary-color: #FFD3B6;
    --background-color: #FFF5F5;
    --text-color: #333333;
    --text-secondary: #666666;
    --white: #FFFFFF;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 800px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器 */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px;
}

/* 标题样式 */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 16px;
}

h1 {
    font-size: 2rem;
    color: var(--primary-color);
}

h2 {
    font-size: 1.5rem;
    color: var(--text-color);
}

h3 {
    font-size: 1.25rem;
}

/* 段落 */
p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

/* 首页样式 */
.hero {
    text-align: center;
    padding: 60px 20px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.hero .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* 目录页卡片 */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.catalog-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.catalog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.catalog-card-image {
    height: 160px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.catalog-card-content {
    padding: 24px;
}

.catalog-card h3 {
    margin-bottom: 8px;
    color: var(--text-color);
}

.catalog-card p {
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 16px;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .hero {
        padding: 40px 16px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .catalog-grid {
        grid-template-columns: 1fr;
    }
}

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

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* 隐藏类 */
.hidden {
    display: none !important;
}