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

body {
    font-family: 'Microsoft YaHei', 'SimSun', 'STSong', 'Segoe UI', 'Arial', 'Helvetica', 'Yu Gothic', 'Yu Mincho', 'Noto Sans CJK JP', 'Noto Sans', 'Noto Serif', 'Times New Roman', serif;
    line-height: 1.8;
    color: #2c3e50;
    background-color: #f5f2ed;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(139, 69, 19, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(160, 82, 45, 0.03) 0%, transparent 50%);
}

header {
    background: linear-gradient(135deg, #8b4513 0%, #a0522d 50%, #cd853f 100%);
    color: #faf8f3;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(139, 69, 19, 0.3);
    border-bottom: 1px solid rgba(218, 165, 32, 0.3);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 2rem;
    margin-bottom: 0;
    font-weight: normal;
    letter-spacing: 2px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.logo p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: -2px;
    letter-spacing: 1px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: #faf8f3;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 3px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    font-size: 1rem;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: rgba(218, 165, 32, 0.2);
    border-color: rgba(218, 165, 32, 0.5);
    text-shadow: 0 0 5px rgba(218, 165, 32, 0.3);
}

/* 语言切换按钮样式 */
.nav-menu .lang-switch {
    background: linear-gradient(135deg, #cd853f 0%, #daa520 50%, #b8860b 100%);
    border-color: rgba(218, 165, 32, 0.3);
    margin-left: 1rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
}

.nav-menu .lang-switch:hover {
    background: linear-gradient(135deg, #daa520 0%, #ffd700 50%, #cd853f 100%);
    border-color: rgba(255, 215, 0, 0.5);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(218, 165, 32, 0.3);
}

/* 语言下拉菜单样式 */
.lang-dropdown {
    position: relative;
    display: inline-block;
    margin-left: 1rem;
    z-index: 1001;
}

.lang-dropdown-btn {
    background: linear-gradient(135deg, #cd853f 0%, #daa520 50%, #b8860b 100%);
    border: 1px solid rgba(218, 165, 32, 0.3);
    color: #faf8f3;
    padding: 0.4rem 0.8rem;
    border-radius: 3px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-dropdown-btn:hover {
    background: linear-gradient(135deg, #daa520 0%, #ffd700 50%, #cd853f 100%);
    border-color: rgba(255, 215, 0, 0.5);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(218, 165, 32, 0.3);
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    border: 1px solid rgba(218, 165, 32, 0.3);
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.15);
    min-width: 140px;
    z-index: 1002;
    margin-top: 0.5rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    pointer-events: none;
}

.lang-dropdown-content.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.lang-dropdown-content a {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: #8b4513;
    border: none;
    margin: 0;
    border-radius: 0;
    transition: all 0.3s ease;
}

.lang-dropdown-content a:hover {
    background: rgba(218, 165, 32, 0.1);
    color: #a0522d;
    transform: none;
    box-shadow: none;
}

.lang-dropdown-content a:first-child {
    border-radius: 8px 8px 0 0;
}

.lang-dropdown-content a:last-child {
    border-radius: 0 0 8px 8px;
}

/* 语言标志 */
.lang-flag {
    font-size: 1rem;
    margin-right: 0.3rem;
}

/* 确保下拉菜单在移动设备上正常显示 */
@media (max-width: 768px) {
    .lang-dropdown {
        margin-left: 0.5rem;
    }
    
    .lang-dropdown-btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }
    
    .lang-dropdown-content {
        min-width: 120px;
        right: -10px;
    }
    
    .lang-dropdown-content a {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* 防止下拉菜单被遮挡 */
.lang-dropdown-content {
    backdrop-filter: blur(10px);
    background: linear-gradient(135deg, rgba(250, 248, 243, 0.95) 0%, rgba(245, 242, 237, 0.95) 100%);
}

/* 确保导航栏有足够的z-index */
header {
    z-index: 1000;
}

.nav-menu {
    z-index: 1001;
}

/* 汉堡菜单默认隐藏 */
.menu-toggle {
    display: none;
}

/* 添加悬停状态的视觉反馈 */
.lang-dropdown-btn:hover {
    cursor: pointer;
}

.lang-dropdown-content a:hover {
    background: rgba(218, 165, 32, 0.15);
    color: #8b4513;
}

main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.4)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #faf8f3;
    position: relative;
    /* 临时背景色，直到图片被添加 */
    background-color: #2c3e50;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, transparent 0%, rgba(139, 69, 19, 0.2) 100%);
}

.hero-content {
    max-width: 800px;
    padding: 3rem;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.7);
    font-weight: normal;
    letter-spacing: 3px;
    line-height: 1.3;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.6);
    letter-spacing: 1px;
}

.hero-description {
    font-size: 1rem;
    line-height: 1.8;
}

.intro {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.intro-content {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.15);
    border: 1px solid rgba(218, 165, 32, 0.2);
    position: relative;
}

.intro-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #8b4513, #cd853f, #daa520);
    border-radius: 8px 8px 0 0;
}

.intro-content h2 {
    color: #8b4513;
    margin-bottom: 1.5rem;
    font-size: 2.2rem;
    font-weight: normal;
    letter-spacing: 1px;
    text-align: center;
    position: relative;
}

.intro-content h2::after {
    content: '◆';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    color: #cd853f;
    font-size: 1rem;
}

.intro-content ul {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.intro-content li {
    margin-bottom: 0.5rem;
}

.features {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.15);
    border: 1px solid rgba(218, 165, 32, 0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, #8b4513, #cd853f, #daa520);
}

.feature:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(139, 69, 19, 0.25);
}

.feature h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-size: 1.6rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #8b4513 0%, #a0522d 50%, #cd853f 100%);
    color: #faf8f3;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 25px;
    margin-top: 1.5rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(218, 165, 32, 0.3);
    letter-spacing: 1px;
    font-size: 1rem;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.3);
    background: linear-gradient(135deg, #a0522d 0%, #cd853f 50%, #daa520 100%);
}

footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: #faf8f3;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid rgba(218, 165, 32, 0.3);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
}

/* 页面头部样式 */
.page-header {
    background: linear-gradient(135deg, #8b4513 0%, #a0522d 50%, #cd853f 100%);
    color: #faf8f3;
    padding: 6rem 0 4rem;
    text-align: center;
    margin-top: 80px;
    position: relative;
    box-shadow: 0 4px 20px rgba(139, 69, 19, 0.3);
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(218, 165, 32, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 69, 19, 0.1) 0%, transparent 50%);
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-header-content h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: normal;
    letter-spacing: 2px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.page-header-content p {
    font-size: 1.2rem;
    opacity: 0.9;
    letter-spacing: 1px;
}

/* 内容区域样式 */
.content-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.content-container {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.15);
    padding: 3rem;
    border: 1px solid rgba(218, 165, 32, 0.2);
    position: relative;
}

.content-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #8b4513, #cd853f, #daa520);
    border-radius: 8px 8px 0 0;
}

/* 理论页面样式 */
.theory-section {
    margin-bottom: 3rem;
}

.theory-section:last-child {
    margin-bottom: 0;
}

.theory-section h2 {
    color: #8b4513;
    margin-bottom: 1.5rem;
    font-size: 2.2rem;
    font-weight: normal;
    letter-spacing: 1px;
    text-align: center;
    position: relative;
}

.theory-section h2::after {
    content: '◆';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    color: #cd853f;
    font-size: 1rem;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.philosophy-item {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #8b4513;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    transition: all 0.3s ease;
}

.philosophy-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.2);
}

.philosophy-item h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.practice-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.method {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

.method h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

/* 图书页面样式 */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.book-card {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    border-radius: 8px;
    padding: 2rem;
    border-left: 4px solid #8b4513;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    position: relative;
}

.book-card::before {
    content: '📖';
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    opacity: 0.3;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.2);
}

.book-info h3 {
    color: #8b4513;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.author {
    color: #666;
    font-style: italic;
    margin-bottom: 1rem;
}

.description {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.key-insights h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.key-insights ul {
    margin-left: 1.5rem;
}

.reading-suggestions {
    margin-top: 4rem;
}

.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.suggestion {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

.suggestion h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

/* 人物页面样式 */
.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.person-card {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    border-radius: 8px;
    padding: 2rem;
    border-left: 4px solid #8b4513;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    position: relative;
}

.person-card::before {
    content: '👤';
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    opacity: 0.3;
}

.person-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.2);
}

.person-info h3 {
    color: #8b4513;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.period {
    color: #666;
    font-style: italic;
    margin-bottom: 1rem;
}

.contributions {
    margin-top: 1.5rem;
}

.contributions h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.contributions ul {
    margin-left: 1.5rem;
}

.common-threads {
    margin-top: 4rem;
}

.traits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.trait {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

.trait h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

/* 语录页面样式 */
.quotes-categories {
    margin-bottom: 3rem;
}

.category {
    margin-bottom: 3rem;
}

.category h2 {
    color: #8b4513;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    border-bottom: 2px solid #cd853f;
    padding-bottom: 0.5rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.quotes-list {
    display: grid;
    gap: 2rem;
}

.quote {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #8b4513;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    position: relative;
}

.quote::before {
    content: '"';
    position: absolute;
    top: 0.5rem;
    left: 1rem;
    font-size: 3rem;
    color: #cd853f;
    opacity: 0.3;
    font-family: Georgia, serif;
}

.quote:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.2);
}

.quote-text {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    font-style: italic;
}

.quote-author {
    text-align: right;
    color: #666;
    font-weight: bold;
}

.reflection-section {
    margin-top: 4rem;
}

.reflection-tips {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tip {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
}

.tip h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.tip ul {
    margin-left: 1.5rem;
}

/* 新增样式支持 */
.deep-explanation {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(139, 69, 19, 0.05);
    border-radius: 8px;
    border-left: 3px solid #cd853f;
}

.deep-explanation h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
}

.philosophy-synthesis {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(139, 69, 19, 0.05);
    border-radius: 8px;
    border-left: 3px solid #cd853f;
}

.philosophy-synthesis h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
}

.advanced-practices {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(139, 69, 19, 0.05);
    border-radius: 8px;
    border-left: 3px solid #cd853f;
}

.advanced-practices h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
}

/* 首页新增样式 */
.modern-significance {
    margin: 4rem auto;
    max-width: 1200px;
    padding: 0 2rem;
}

.practice-methods {
    margin: 4rem auto;
    max-width: 1200px;
    padding: 0 2rem;
}

.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.practice-method {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #8b4513;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    transition: all 0.3s ease;
}

.practice-method:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.2);
}

.practice-method h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.common-questions {
    margin: 4rem auto;
    max-width: 1200px;
    padding: 0 2rem;
}

.qa-list {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.qa-item {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    transition: all 0.3s ease;
}

.qa-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.2);
}

.qa-item h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-weight: normal;
}

.journey-stages {
    margin: 4rem auto;
    max-width: 1200px;
    padding: 0 2rem;
}

.stages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.stage {
    background: linear-gradient(135deg, #faf8f3 0%, #f5f2ed 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #8b4513;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.1);
    border: 1px solid rgba(218, 165, 32, 0.2);
    transition: all 0.3s ease;
}

.stage:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(139, 69, 19, 0.2);
}

.stage h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.stage strong {
    color: #667eea;
    font-weight: normal;
}

/* 更新特性网格以支持4个项目 */
.features {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.modern-significance {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.significance-item {
    background: rgba(139, 69, 19, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 3px solid #cd853f;
}

.significance-item h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
}

.theory-development {
    margin: 4rem auto;
    max-width: 1200px;
    padding: 0 2rem;
}

.theory-development h3 {
    color: #8b4513;
    margin-bottom: 1rem;
    font-weight: normal;
    margin-top: 1.5rem;
}

.theory-development h3:first-child {
    margin-top: 0;
}

/* 响应式设计 */
/* 移动端适配 */
@media (max-width: 768px) {
    /* 导航栏汉堡菜单 */
    .menu-toggle {
        display: block;
        position: fixed;
        top: 1rem;
        right: 1rem;
        z-index: 1002;
        background: linear-gradient(135deg, #cd853f 0%, #daa520 50%, #b8860b 100%);
        border: none;
        border-radius: 5px;
        padding: 0.5rem;
        cursor: pointer;
        box-shadow: 0 2px 10px rgba(139, 69, 19, 0.3);
    }
    
    .menu-toggle span {
        display: block;
        width: 25px;
        height: 3px;
        background: #faf8f3;
        margin: 5px 0;
        transition: 0.3s;
        border-radius: 2px;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    /* 导航栏样式 */
    header {
        padding: 1rem 0;
    }
    
    nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 0 1rem;
    }
    
    .logo {
        margin-bottom: 1rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .logo p {
        font-size: 0.8rem;
    }
    
    /* 导航菜单样式 */
    .nav-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, #8b4513 0%, #a0522d 50%, #cd853f 100%);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1.5rem;
        z-index: 1001;
        padding: 2rem;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu a {
        font-size: 1.2rem;
        padding: 1rem 2rem;
        border-radius: 10px;
        text-align: center;
        min-width: 200px;
    }
    
    /* 语言下拉菜单移动端样式 */
    .lang-dropdown {
        margin-left: 0;
        margin-top: 1rem;
    }
    
    .lang-dropdown-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
        min-width: 200px;
        justify-content: center;
    }
    
    .lang-dropdown-content {
        position: static;
        display: none;
        background: rgba(250, 248, 243, 0.95);
        border-radius: 10px;
        margin-top: 1rem;
        box-shadow: 0 4px 15px rgba(139, 69, 19, 0.2);
    }
    
    .lang-dropdown-content.show {
        display: block;
        opacity: 1;
        transform: none;
        pointer-events: auto;
    }
    
    /* 主要内容区域 */
    main {
        margin-top: 80px;
        min-height: calc(100vh - 80px);
    }
    
    /* 英雄区域 */
    .hero {
        height: 60vh;
        padding: 2rem 1rem;
    }
    
    .hero-content {
        text-align: center;
        padding: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }
    
    .hero-description {
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    /* 内容容器 */
    .intro-content,
    .content-container,
    .page-content {
        padding: 1.5rem;
    }
    
    .page-header-content h1 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }
    
    .page-header-content p {
        font-size: 1rem;
        line-height: 1.6;
    }
    
    /* 网格布局 */
    .books-grid,
    .people-grid,
    .philosophy-grid,
    .practice-methods,
    .suggestion-grid,
    .traits-grid,
    .reflection-tips {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* 卡片样式 */
    .book-card,
    .person-card,
    .feature-card,
    .theory-section,
    .practice-method,
    .suggestion,
    .trait,
    .reflection-tip {
        padding: 1.5rem;
        border-radius: 10px;
    }
    
    .book-card h3,
    .person-card h3 {
        font-size: 1.2rem;
        margin-bottom: 0.8rem;
    }
    
    .book-card p,
    .person-card p {
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    /* 语录卡片 */
    .quote {
        padding: 1.5rem;
        border-radius: 10px;
        margin-bottom: 1.5rem;
    }
    
    .quote-text {
        font-size: 1.1rem;
        line-height: 1.6;
        margin-bottom: 1rem;
    }
    
    .quote-author {
        font-size: 0.9rem;
    }
    
    /* 页脚 */
    footer {
        padding: 2rem 1rem;
        text-align: center;
    }
    
    footer p {
        font-size: 0.9rem;
    }
    
    /* 按钮样式 */
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
        border-radius: 25px;
    }
    
    /* 返回顶部按钮 */
    .back-to-top {
        width: 45px;
        height: 45px;
        font-size: 18px;
        bottom: 15px;
        right: 15px;
    }
}

/* 超小屏幕适配 */
@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .logo p {
        font-size: 0.7rem;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .nav-menu a {
        font-size: 1.1rem;
        padding: 0.8rem 1.5rem;
        min-width: 180px;
    }
    
    .lang-dropdown-btn {
        min-width: 180px;
        font-size: 0.9rem;
    }
    
    .intro-content,
    .content-container,
    .page-content {
        padding: 1rem;
    }
    
    .page-header-content h1 {
        font-size: 1.6rem;
    }
    
    .book-card,
    .person-card,
    .feature-card,
    .theory-section,
    .practice-method,
    .suggestion,
    .trait,
    .reflection-tip,
    .quote {
        padding: 1rem;
    }
    
    .quote-text {
        font-size: 1rem;
    }
    
    .quote-author {
        font-size: 0.8rem;
    }
}
/* Membership styles */
.upgrade-modal {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center;
    z-index: 9999;
}
.modal-content {
    background: white; padding: 40px; border-radius: 20px; text-align: center; max-width: 400px;
}
.modal-content h2 { color: #8b4513; margin-bottom: 10px; }
.modal-content .btn {
    display: inline-block; padding: 15px 40px; background: #8b4513; color: white;
    text-decoration: none; border-radius: 10px; margin: 20px 0; font-size: 1.1em;
}
.toast {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    background: #8b4513; color: white; padding: 15px 30px; border-radius: 10px;
    animation: fadeIn 0.3s;
}
@keyframes fadeIn { from { opacity: 0; transform: translateX(-50%) translateY(20px); } }