/* styles.css - 融合统一版本 */

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #e74c3c;
    --secondary-light: #f39c12;
    --dark-color: #2c3e50;
    --darker-color: #34495e;
    --light-color: #ecf0f1;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --text-lighter: #bdc3c7;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --border-radius: 15px;
    --border-radius-sm: 10px;
    --border-radius-lg: 25px;
    --shadow: 0 5px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 10px 30px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

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

/* 头部导航栏 */
header {
    background: url('images/页头背景.jpg') no-repeat center center;
    background-size: cover;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    position: relative;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.8), rgba(52, 73, 94, 0.9));
    z-index: -1;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    color: var(--bg-white);
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--secondary-color), var(--secondary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    color: var(--light-color);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
    position: relative;
}

nav a:hover {
    color: var(--primary-color);
    background: rgba(255,255,255,0.1);
}

nav a.active {
    color: var(--primary-color);
    background: rgba(52, 152, 219, 0.1);
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

.user-actions {
    display: flex;
    gap: 15px;
}

.user-actions button {
    padding: 8px 20px;
    border: none;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

#login-btn {
    background: transparent;
    color: var(--light-color);
    border: 2px solid var(--primary-color);
}

#login-btn:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    transform: translateY(-2px);
}

#register-btn {
    background: linear-gradient(45deg, var(--secondary-color), var(--secondary-light));
    color: var(--bg-white);
    border: 2px solid transparent;
}

#register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

/* 页面头部 */
.page-header {
            position: relative;
            height: 400px;
            overflow: hidden;
            display: flex;
            align-items: center;
            color: white;
        }
        
        .video-background {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: -1;
        }
        
        .video-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 0;
        }
        
        .page-header .container {
            position: relative;
            z-index: 1;
            text-align: center;
            width: 100%;
        }
        
        .page-header h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
        }
        
        .page-header p {
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0 auto;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
        }

/* 英雄区域 */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
    color: var(--bg-white);
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-button {
    background: linear-gradient(45deg, var(--secondary-color), var(--secondary-light));
    color: var(--bg-white);
    padding: 12px 30px;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.4);
}

.hero-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

/* 通用部分样式 */
.section-title {
    text-align: center;
    color: var(--text-dark);
    font-size: 2.2rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    margin: 15px auto 0;
    border-radius: 2px;
}

/* 特色课程区域 */
.featured-courses {
    padding: 80px 0;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.course-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid #f8f9fa;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.course-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-thumbnail img {
    transform: scale(1.05);
}

.course-duration {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(0,0,0,0.7);
    color: var(--bg-white);
    padding: 5px 10px;
    border-radius: var(--border-radius-lg);
    font-size: 0.8rem;
    font-weight: 600;
}

.course-level {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 5px 12px;
    border-radius: var(--border-radius-lg);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.course-level.beginner {
    background: var(--success-color);
    color: var(--bg-white);
}

.course-level.intermediate {
    background: var(--warning-color);
    color: var(--bg-white);
}

.course-level.advanced {
    background: var(--danger-color);
    color: var(--bg-white);
}

.course-info {
    padding: 25px;
}

.course-info h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin-bottom: 15px;
    line-height: 1.3;
}

.course-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.course-info p {
    color: #5d6d7e;
    margin-bottom: 20px;
    line-height: 1.5;
}

.course-price {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.btn-view {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-white);
    padding: 10px 20px;
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-block;
}

.btn-view:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

/* 优势区域 */
.benefits {
    padding: 80px 0;
    background: var(--bg-light);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.benefit-item {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.benefit-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.benefit-item i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
}

.benefit-item h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.benefit-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 关于工尺谱区域 */
.about-gongchepu {
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    align-items: center;
    margin-top: 40px;
}

.about-text h2 {
    color: var(--text-dark);
    margin-bottom: 20px;
    font-size: 1.8rem;
    position: relative;
    padding-left: 20px;
}

.about-text h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 5px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-dark));
    border-radius: 5px;
}

.about-text p {
    margin-bottom: 25px;
    color: #5d6d7e;
    line-height: 1.7;
    font-size: 1.05rem;
}

.about-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* 课程目录页面 */
.courses-catalog {
    padding: 60px 0;
}

.filter-options {
    background: var(--bg-white);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 40px;
    display: flex;
    gap: 30px;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 15px;
}

.filter-group label {
    font-weight: 600;
    color: var(--text-dark);
}

.filter-group select {
    padding: 10px 15px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius-sm);
    background: var(--bg-white);
    font-size: 14px;
    transition: var(--transition);
    min-width: 150px;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.course-categories {
    margin-bottom: 60px;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.category-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid #f8f9fa;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.category-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--bg-white);
    font-size: 1.8rem;
}

.category-card h3 {
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.course-count {
    background: #ecf0f1;
    color: var(--darker-color);
    padding: 5px 15px;
    border-radius: var(--border-radius-lg);
    font-size: 0.85rem;
    font-weight: 600;
}

.all-courses {
    margin-top: 40px;
}

/* 学习路径 */
.learning-path {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    padding: 60px 0;
    margin-top: 60px;
}

.path-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.path-step {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
}

.path-step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.path-step h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.path-step p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.path-step ul {
    list-style: none;
    text-align: left;
}

.path-step li {
    padding: 8px 0;
    border-bottom: 1px solid #f1f2f6;
    color: #5d6d7e;
    font-size: 0.9rem;
}

.path-step li:last-child {
    border-bottom: none;
}

/* 关于我们页面 */
.about-intro {
    padding: 60px 0;
}

.team-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.team-member {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.member-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 20px;
    border: 5px solid #f1f2f6;
}

.member-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-member h3 {
    color: var(--text-dark);
    margin-bottom: 5px;
    font-size: 1.3rem;
}

.member-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.member-bio {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.achievements {
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--secondary-color), var(--secondary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.stat-label {
    color: #5d6d7e;
    font-size: 1.1rem;
    font-weight: 600;
}

.values {
    padding: 60px 0;
    background: var(--bg-light);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.value-item {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.value-item i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
}

.value-item h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.value-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 联系我们页面 */
.contact-main {
    padding: 60px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}

.contact-info h2 {
    color: var(--text-dark);
    margin-bottom: 30px;
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 15px;
}

.contact-info h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    border-radius: 3px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-white);
    border-radius: var(--border-radius-sm);
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-details h3 {
    color: var(--text-dark);
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.contact-details p {
    color: var(--text-light);
    margin-bottom: 3px;
    font-size: 0.95rem;
}

.contact-form-container {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.contact-form-container h2 {
    color: var(--text-dark);
    margin-bottom: 30px;
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 15px;
}

.contact-form-container h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    border-radius: 3px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn-submit {
    background: linear-gradient(45deg, var(--secondary-color), var(--secondary-light));
    color: var(--bg-white);
    padding: 12px 30px;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

/* 常见问题部分 */
.faq-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.faq-item {
    background: var(--bg-white);
    padding: 25px;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.faq-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.faq-item h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.faq-item p {
    color: #5d6d7e;
    line-height: 1.6;
}

/* 地图部分 */
.map-section {
    padding: 60px 0;
}

.map-container {
    height: 400px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-top: 30px;
}

.map-placeholder {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.2rem;
}

.map-placeholder i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.8;
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, var(--dark-color), var(--darker-color));
    color: var(--light-color);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: var(--bg-white);
    margin-bottom: 25px;
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary-color);
}

.footer-section.about p {
    color: var(--text-lighter);
    line-height: 1.7;
    margin-bottom: 25px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: var(--light-color);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-section.links ul {
    list-style: none;
}

.footer-section.links li {
    margin-bottom: 12px;
}

.footer-section.links a {
    color: var(--text-lighter);
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
}

.footer-section.links a:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--text-lighter);
}

.contact-info i {
    color: var(--primary-color);
    width: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #95a5a6;
    font-size: 0.9rem;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: var(--bg-white);
    margin: 5% auto;
    padding: 0;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    position: relative;
}

.close {
    color: var(--text-light);
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    right: 15px;
    top: 10px;
    cursor: pointer;
    z-index: 10;
}

.close:hover {
    color: var(--text-dark);
}

.tab-container {
    display: flex;
    border-bottom: 1px solid #e9ecef;
}

.tab-btn {
    flex: 1;
    padding: 15px;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
    padding: 30px;
}

.tab-content.active {
    display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        gap: 15px;
    }
    
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .filter-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .path-steps,
    .categories-grid,
    .team-grid,
    .values-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .hero-content h2 {
        font-size: 1.6rem;
    }
    
    .course-info {
        padding: 20px;
    }
    
    .contact-form-container {
        padding: 25px;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
}

/* 校区信息部分 */
.campus-info {
    padding: 60px 0;
    background: var(--bg-light);
}

.campus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.campus-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.campus-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.campus-image {
    height: 200px;
    overflow: hidden;
}

.campus-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.campus-card:hover .campus-image img {
    transform: scale(1.05);
}

.campus-details {
    padding: 25px;
}

.campus-details h3 {
    color: var(--text-dark);
    font-size: 1.4rem;
    margin-bottom: 15px;
}

.campus-details p {
    color: var(--text-light);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.campus-details i {
    color: var(--primary-color);
    width: 16px;
}

/* 地图操作按钮 */
.map-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    justify-content: center;
}

.map-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    padding: 10px 20px;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.map-btn:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.map-placeholder h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.map-placeholder p {
    margin-bottom: 5px;
    opacity: 0.9;
}

/* 来访提示部分 */
.visit-tips {
    padding: 60px 0;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.tip-item {
    background: var(--bg-white);
    padding: 30px 25px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tip-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.tip-item i {
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.tip-item h3 {
    color: var(--text-dark);
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.tip-item p {
    color: var(--text-light);
    line-height: 1.5;
    font-size: 0.95rem;
}

/* 交通指南特殊样式 */
.contact-item .contact-details p {
    line-height: 1.4;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .campus-grid {
        grid-template-columns: 1fr;
    }
    
    .map-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .map-btn {
        width: 200px;
        justify-content: center;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
}

/* 用户菜单样式 */
.user-actions .welcome-text {
    color: var(--light-color);
    margin-right: 10px;
    font-weight: 500;
}

.user-menu {
    position: relative;
    display: inline-block;
}

.user-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light-color);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 15px;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-white);
    min-width: 200px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    padding: 10px 0;
    margin-top: 10px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1000;
}

.user-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 0.95rem;
}

.dropdown-item:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.dropdown-item.logout-btn {
    color: var(--danger-color);
}

.dropdown-item.logout-btn:hover {
    background: rgba(231, 76, 60, 0.1);
}

.dropdown-divider {
    height: 1px;
    background: #e9ecef;
    margin: 8px 0;
}

/* 全局消息样式 */
.global-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-white);
    padding: 15px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 9999;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    max-width: 400px;
}

.global-message.show {
    transform: translateX(0);
}

.message-success {
    border-left: 4px solid var(--success-color);
}

.message-error {
    border-left: 4px solid var(--danger-color);
}

.message-info {
    border-left: 4px solid var(--primary-color);
}

.message-warning {
    border-left: 4px solid var(--warning-color);
}

.message-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message-close:hover {
    color: var(--text-dark);
}

/* 上传页面样式 */
.upload-main {
    padding: 40px 0 80px;
}

.upload-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.upload-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.upload-header {
    padding: 40px 40px 30px;
    text-align: center;
    border-bottom: 1px solid #e9ecef;
}

.upload-header i {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.upload-header h2 {
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.upload-header p {
    color: var(--text-light);
}

.upload-area {
    padding: 60px 40px;
    border: 2px dashed #e9ecef;
    margin: 0 40px 40px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(52, 152, 219, 0.05);
}

.upload-placeholder {
    text-align: center;
    color: var(--text-light);
}

.upload-placeholder i {
    font-size: 4rem;
    color: #e9ecef;
    margin-bottom: 20px;
}

.upload-placeholder h3 {
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.upload-placeholder p {
    margin-bottom: 20px;
}

.browse-btn {
    background: var(--primary-color);
    color: var(--bg-white);
    border: none;
    padding: 12px 30px;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.browse-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* 上传进度样式 */
.upload-progress {
    padding: 0 40px 40px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.progress-header span:first-child {
    color: var(--text-dark);
    font-weight: 600;
}

.progress-percent {
    color: var(--primary-color);
    font-weight: 700;
}

.progress-bar {
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 视频信息表单 */
.video-info-form {
    padding: 0 40px 40px;
}

.video-info-form h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
    font-size: 1.3rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-grid .form-group:first-child {
    grid-column: 1 / -1;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 30px;
}

.btn-cancel {
    background: var(--bg-white);
    color: var(--text-dark);
    border: 2px solid #e9ecef;
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-cancel:hover {
    background: #f8f9fa;
    border-color: var(--text-light);
}

/* 上传成功样式 */
.upload-success {
    padding: 60px 40px;
    text-align: center;
}

.success-icon {
    font-size: 4rem;
    color: var(--success-color);
    margin-bottom: 20px;
}

.upload-success h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.upload-success p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.success-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--bg-white);
    border: none;
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-dark);
    border: 2px solid #e9ecef;
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: #f8f9fa;
    border-color: var(--text-light);
}

/* 上传指南样式 */
.upload-guidelines {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.upload-guidelines h3 {
    color: var(--text-dark);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.guidelines-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.guideline-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-light);
}

.guideline-item i {
    color: var(--success-color);
    font-size: 1rem;
}

/* 我的视频样式 */
.my-videos {
    padding: 60px 0;
    background: var(--bg-light);
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.video-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.video-thumbnail {
    position: relative;
    height: 180px;
    background: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-placeholder {
    text-align: center;
    color: #e9ecef;
}

.video-placeholder i {
    font-size: 3rem;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
}

.video-status {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.video-status.processing {
    background: var(--warning-color);
    color: white;
}

.video-status.completed {
    background: var(--success-color);
    color: white;
}

.video-status.failed {
    background: var(--danger-color);
    color: white;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 1.1rem;
    line-height: 1.3;
}

.video-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 12px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.video-info p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 15px;
}

.video-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.upload-time {
    color: var(--text-light);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.btn-action {
    background: none;
    border: 1px solid #e9ecef;
    color: var(--text-light);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
}

.btn-action:hover {
    background: #f8f9fa;
    color: var(--text-dark);
}

.btn-action.delete:hover {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
    border-color: rgba(231, 76, 60, 0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .upload-container {
        grid-template-columns: 1fr;
    }
    
    .upload-area {
        margin: 0 20px 20px;
        padding: 40px 20px;
    }
    
    .upload-header,
    .video-info-form,
    .upload-progress {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .success-actions {
        flex-direction: column;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .user-actions .welcome-text {
        display: none;
    }
}


/* 视频预览样式 */
.video-preview {
    padding: 0 20px 20px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #e9ecef;
    margin-bottom: 20px;
}

.preview-header h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin: 0;
}

.preview-close {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: var(--transition);
}

.preview-close:hover {
    color: var(--text-dark);
    background: #f8f9fa;
}

.preview-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    margin-bottom: 20px;
}

/* 视频播放器样式 */
.video-player-container {
    background: #000;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

#previewVideo {
    width: 100%;
    height: 300px;
    display: block;
    background: #000;
}

.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-player-container:hover .video-controls {
    opacity: 1;
}

.control-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.progress-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s ease;
}

.time-display {
    color: white;
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
}

#volumeSlider {
    width: 80px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

#volumeSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
}

#volumeSlider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: none;
}

/* 视频信息预览样式 */
.video-info-preview {
    background: var(--bg-light);
    padding: 20px;
    border-radius: var(--border-radius);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.info-item:last-child {
    border-bottom: none;
}

.info-item label {
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.9rem;
}

.info-item span {
    color: var(--text-light);
    font-size: 0.9rem;
    text-align: right;
}

/* 预览操作按钮 */
.preview-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

/* 最近文件样式 */
.file-browser {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
}

.file-browser h4 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.recent-files {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.recent-file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    cursor: pointer;
}

.recent-file-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.file-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    color: var(--text-light);
    font-size: 0.8rem;
    margin-top: 2px;
}

.file-action {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: var(--transition);
}

.file-action:hover {
    background: rgba(52, 152, 219, 0.1);
    transform: scale(1.1);
}

.no-files {
    color: var(--text-light);
    text-align: center;
    padding: 20px;
    font-style: italic;
}

/* 全屏样式 */
.video-player-container:fullscreen {
    width: 100%;
    height: 100%;
}

.video-player-container:fullscreen #previewVideo {
    height: calc(100vh - 80px);
}

.video-player-container:fullscreen .video-controls {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preview-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .video-controls {
        padding: 10px;
        gap: 10px;
    }
    
    .control-btn {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
    
    #volumeSlider {
        width: 60px;
    }
    
    .preview-actions {
        flex-direction: column;
    }
    
    .info-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .info-item span {
        text-align: left;
    }
}

/* 论坛功能样式 */
.forum-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.forum-overview {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.forum-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.forum-cta {
    display: flex;
    gap: 15px;
}

.btn-forum, .btn-post {
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.btn-forum {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-white);
}

.btn-post {
    background: var(--bg-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-forum:hover, .btn-post:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 热门讨论 */
.forum-hot-topics {
    margin-bottom: 50px;
}

.forum-hot-topics h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.topic-card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.topic-category {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.topic-time {
    color: var(--text-light);
    font-size: 0.9rem;
}

.topic-card h4 {
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.topic-card p {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.5;
}

.topic-meta {
    display: flex;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.topic-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 最新帖子 */
.forum-latest-posts {
    margin-bottom: 50px;
}

.forum-latest-posts h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.posts-list {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.post-item {
    display: flex;
    gap: 15px;
    padding: 20px;
    border-bottom: 1px solid #f1f2f6;
    transition: var(--transition);
}

.post-item:hover {
    background: #f8f9fa;
}

.post-item:last-child {
    border-bottom: none;
}

.post-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.post-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-content {
    flex: 1;
}

.post-content h4 {
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 1rem;
}

.post-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.post-info {
    display: flex;
    gap: 15px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.post-author {
    color: var(--primary-color);
    font-weight: 600;
}

/* 论坛分类 */
.forum-categories h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.category-card {
    background: var(--bg-white);
    padding: 30px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-dark);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.category-card i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.category-card h4 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.category-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.category-count {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .forum-overview {
        flex-direction: column;
        gap: 25px;
        text-align: center;
    }
    
    .forum-stats {
        justify-content: center;
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}