/* 全局样式 */
:root {
    --primary-color: #6B8CA3;
    --secondary-color: #8FA8BC;
    --accent-color: #7DA0B8;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-lighter: #fefefe;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --border-light: #f0f0f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-lighter);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 辅助功能类 - 视觉隐藏但对屏幕阅读器可见 */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 触摸优化 */
@media (hover: none) and (pointer: coarse) {
    /* 移除触摸设备上的 hover 效果 */
    .module-card:hover,
    .quick-access-card:hover,
    .feature-item:hover {
        transform: none;
    }

    /* 增加触摸目标大小 */
    .nav-menu a,
    .module-btn,
    .version-btn,
    .quick-access-card,
    button {
        min-height: 48px;
        min-width: 48px;
    }

    /* 触摸反馈 */
    .module-btn:active,
    .version-btn:active,
    .search-btn:active {
        opacity: 0.7;
        transform: scale(0.98);
    }
}

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

/* 导航栏 */
.navbar {
    background: white;
    color: var(--text-dark);
    padding: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-light);
}

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

.nav-brand h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    letter-spacing: 0.05em;
    color: var(--primary-color);
}

.nav-brand .tagline {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 400;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.nav-menu a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.nav-menu a.active {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* 欢迎区域 */
.hero {
    background: #f5f7fa;
    color: var(--text-dark);
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-light);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(107,140,163,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

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

.hero-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    animation: fadeInUp 1s ease-out;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    animation: fadeInUp 1.2s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 主要内容 */
.main-content {
    padding: 3rem 0;
}

/* 搜索区域 */
.search-section {
    margin-bottom: 3rem;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    background: white;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.search-box:focus-within {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
}

.search-btn {
    padding: 1rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background: var(--accent-color);
}

/* 模块卡片 */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.module-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-color);
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.module-card[data-module="modern"]::before {
    background: #E8A5A5;
}

.module-card[data-module="classical"]::before {
    background: #9CB4CC;
}

.module-card[data-module="poetry"]::before {
    background: #B5D8C3;
}

.module-icon {
    width: 80px;
    height: 80px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    background: var(--bg-light);
}

.module-card[data-module="modern"] .module-icon {
    background: #F5E6E6;
    color: #C77676;
}

.module-card[data-module="classical"] .module-icon {
    background: #E8EEF4;
    color: #6B8CA3;
}

.module-card[data-module="poetry"] .module-icon {
    background: #E8F4ED;
    color: #7BA78D;
}

.module-card:hover .module-icon {
    transform: scale(1.05);
}

.module-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.module-desc {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.module-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 0.75rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.module-btn {
    display: block;
    width: 100%;
    padding: 0.875rem;
    text-align: center;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.75rem;
    font-weight: 500;
    transition: var(--transition);
}

.module-card[data-module="modern"] .module-btn {
    background: #C77676;
}

.module-card[data-module="classical"] .module-btn {
    background: #6B8CA3;
}

.module-card[data-module="poetry"] .module-btn {
    background: #7BA78D;
}

.module-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    opacity: 0.9;
}

/* 快速入口区域 */
.quick-access-section {
    margin: 4rem 0;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 1.5rem;
}

.quick-access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.quick-access-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: 1rem;
    text-decoration: none;
    color: var(--text-dark);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.quick-access-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    transition: var(--transition);
}

.quick-access-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.quick-access-card:hover::before {
    width: 100%;
    opacity: 0.05;
}

.quick-access-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 0.75rem;
    transition: var(--transition);
}

.quick-access-card:hover .quick-access-icon {
    transform: scale(1.1) rotate(5deg);
    background: var(--secondary-color);
}

.quick-access-content {
    flex: 1;
}

.quick-access-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-family: 'Noto Serif SC', serif;
}

.quick-access-desc {
    font-size: 0.875rem;
    color: var(--text-light);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.quick-access-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 0.75rem;
    border-radius: 1rem;
    font-weight: 500;
}

.quick-access-arrow {
    flex-shrink: 0;
    color: var(--primary-color);
    transition: var(--transition);
    opacity: 0.5;
}

.quick-access-card:hover .quick-access-arrow {
    transform: translateX(5px);
    opacity: 1;
}

/* 响应式：小型移动设备 */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .navbar {
        padding: 1rem 0;
    }

    .navbar .container {
        position: relative;
    }

    .nav-brand h1 {
        font-size: 1.5rem;
    }

    .nav-brand .tagline {
        font-size: 0.75rem;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-light);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: all 0.3s ease;
    }

    .nav-menu.active {
        max-height: 300px;
        opacity: 1;
    }

    .nav-menu a {
        padding: 1rem 1.5rem;
        font-size: 0.9rem;
        border-radius: 0;
        width: 100%;
        min-height: 48px;
        display: flex;
        align-items: center;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
        background: var(--bg-light);
    }

    .hero {
        padding: 2.5rem 0;
    }

    .hero-title {
        font-size: 1.75rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 0.9rem;
    }

    .main-content {
        padding: 2rem 0;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 2rem;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .modules-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .module-card {
        padding: 1.5rem;
    }

    .module-icon {
        width: 60px;
        height: 60px;
    }

    .module-title {
        font-size: 1.5rem;
    }

    .module-stats {
        gap: 1rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .module-btn {
        padding: 0.75rem;
        font-size: 0.95rem;
        min-height: 44px;
    }

    .quick-access-section {
        padding: 2rem 1rem;
        margin: 2rem 0;
    }

    .quick-access-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .quick-access-card {
        flex-direction: column;
        text-align: center;
        padding: 1.25rem;
    }

    .quick-access-icon {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .quick-access-arrow {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-item {
        padding: 1.5rem;
    }

    .topics-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .topic-card {
        padding: 1.25rem;
    }

    .search-box {
        border-radius: 30px;
    }

    .search-input {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
    }

    .search-btn {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
    }

    .content-viewer {
        padding: 1.5rem;
        margin: 1rem 0;
    }

    .content-title {
        font-size: 1.5rem;
    }

    .content-body {
        font-size: 1rem;
        line-height: 1.8;
    }
}

/* 响应式：移动端 */
@media (max-width: 768px) {
    .container {
        padding: 0 18px;
    }

    .navbar .container {
        position: relative;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-light);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: all 0.3s ease;
        z-index: 999;
    }

    .nav-menu.active {
        max-height: 300px;
        opacity: 1;
    }

    .nav-menu a {
        padding: 1rem 1.5rem;
        font-size: 0.95rem;
        min-height: 48px;
        display: flex;
        align-items: center;
        border-radius: 0;
        width: 100%;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
        background: var(--bg-light);
    }

    .hero {
        padding: 3rem 0;
    }

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

    .hero-subtitle {
        font-size: 1.125rem;
    }

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

    .modules-grid {
        grid-template-columns: 1fr;
        gap: 1.75rem;
    }

    .quick-access-grid {
        grid-template-columns: 1fr;
    }

    .quick-access-card {
        flex-direction: row;
        gap: 1.25rem;
    }

    .quick-access-arrow {
        display: none;
    }

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

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

    .section-title {
        font-size: 1.75rem;
    }

    .page-title {
        font-size: 1.75rem;
    }

    .module-btn,
    .version-btn {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* 特色功能 */
.features-section {
    margin: 4rem 0;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

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

.feature-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.feature-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 页脚 */
.footer {
    background: #f5f7fa;
    color: var(--text-light);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--border-light);
}

.footer p {
    opacity: 0.9;
}

/* 专题列表页面样式 */
.page-header {
    background: #f5f7fa;
    color: var(--text-dark);
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
}

.page-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 3rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
}

.topics-section {
    padding: 3rem 0;
}

.section-header {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.section-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-right: 1rem;
}

.section-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.section-info p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.topic-card {
    background: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
    border-left: 3px solid transparent;
}

.topic-card:hover {
    transform: translateX(3px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--primary-color);
}

.topic-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.topic-number {
    width: 35px;
    height: 35px;
    border-radius: 0.5rem;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--primary-color);
    margin-right: 0.75rem;
    font-size: 0.95rem;
}

.topic-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
}

.topic-content {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.topic-type {
    flex: 1;
    padding: 0.75rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-light);
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.topic-type:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.topic-versions {
    display: flex;
    gap: 0.5rem;
}

.version-btn {
    flex: 1;
    padding: 0.5rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition);
}

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

/* 响应式：平板设备 */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        padding: 0 25px;
    }

    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: 2.75rem;
    }

    .quick-access-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(107, 140, 163, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 内容展示页面样式 */
.content-viewer {
    background: white;
    border-radius: 1rem;
    padding: 3rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-md);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid var(--border-light);
}

.content-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.content-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.content-meta {
    color: var(--text-light);
    font-size: 0.95rem;
}

.content-body {
    line-height: 2;
    font-size: 1.05rem;
}

.content-body h3 {
    font-family: 'Noto Serif SC', serif;
    margin: 2rem 0 1rem;
    color: var(--text-dark);
}

.content-body p {
    margin-bottom: 1rem;
}

.back-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--bg-light);
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: var(--transition);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

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