:root {
    /* 主色调 - 可以根据应用实际品牌色调整 */
    --primary-color: #4a6fa5;
    --primary-dark: #345380;
    --secondary-color: #63c2de;
    --text-color: #333333;
    --light-text: #666666;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e1e4e8;
    --success-color: #28a745;
    --link-color: #2b7de9;
    --footer-bg: #f1f2f3;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 30px 20px;
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    min-height: 100vh;
}

/* 页眉 */
header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-container.center {
    flex-direction: column;
    text-align: center;
}

.logo {
    max-width: 60px;
    height: auto;
    border-radius: 12px;
}

.logo.large {
    max-width: 80px;
}

h1 {
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.updated {
    color: var(--light-text);
    font-style: italic;
    margin-top: 10px;
}

/* 导航 */
.page-nav {
    margin-bottom: 30px;
    padding: 10px;
    background-color: var(--bg-color);
    border-radius: 8px;
}

.page-nav ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 15px;
}

.page-nav a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.page-nav a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* 内容区 */
section {
    margin-bottom: 40px;
}

h2 {
    color: var(--primary-dark);
    margin-top: 30px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

h3 {
    color: var(--secondary-color);
    margin-top: 25px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 8px;
}

strong {
    color: var(--primary-dark);
}

/* 页脚 */
footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.9rem;
    background-color: var(--footer-bg);
    padding: 20px;
    border-radius: 8px;
}

.legal-nav {
    margin-bottom: 15px;
}

/* 主页特定样式 */
.homepage .intro {
    text-align: center;
    margin-bottom: 40px;
}

.document-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.doc-card {
    flex: 1 1 300px;
    padding: 25px;
    background-color: var(--bg-color);
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.doc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.button {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.2s;
}

.button:hover {
    background-color: var(--primary-dark);
    text-decoration: none;
}

.app-info, .app-download {
    text-align: center;
    padding: 30px 20px;
    background-color: var(--bg-color);
    border-radius: 10px;
    margin-bottom: 40px;
}

.features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
}

.feature {
    flex: 1 1 250px;
    padding: 20px;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.feature h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature ul {
    text-align: left;
}

.app-store-button {
    display: inline-block;
    margin-top: 15px;
    transition: opacity 0.2s;
}

.app-store-button:hover {
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    h1 {
        font-size: 1.7rem;
    }

    .page-nav ul {
        flex-direction: column;
        gap: 10px;
    }

    .logo-container {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 0.95rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    h3 {
        font-size: 1.1rem;
    }
}