/* 页面标题 */
.page-title {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    padding: 15px 30px;
    margin-top: 150px;
    margin-bottom: 0;
}

.page-title h1 {
    font-size: 28px;
    margin-bottom: 5px;
    font-weight: 700;
    line-height: 1.2;
}

.breadcrumb {
    font-size: 13px;
    opacity: 0.9;
    max-width: 1400px;
    margin: 0 auto;
}

.breadcrumb a {
    color: #fff;
    opacity: 0.9;
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb span {
    opacity: 0.8;
}

/* 活动筛选 */
.activities-filter {
    padding: 20px 0;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 150px;
    z-index: 100;
    text-align: center;
}

.filter-tabs,
.activity-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.filter-tab,
.filter-btn {
    padding: 8px 20px;
    border: 2px solid #1e3c72;
    background: #fff;
    color: #1e3c72;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-tab:hover,
.filter-tab.active,
.filter-btn:hover,
.filter-btn.active {
    background: #1e3c72;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 60, 114, 0.3);
}

/* 精选活动 */
.featured-activities {
    padding: 80px 0;
    background: #f9f9f9;
}

.featured-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.featured-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
}

.featured-card.large {
    grid-row: span 2;
}

.featured-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

.featured-image {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.featured-card.large .featured-image {
    height: 400px;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.featured-card:hover .featured-image img {
    transform: scale(1.1);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ff8e8e 100%);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.featured-content {
    padding: 30px;
}

.activity-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

.activity-type {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 13px;
    font-weight: 500;
}

.activity-status {
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 13px;
    font-weight: 500;
}

.activity-status.upcoming {
    background: #e8f5e9;
    color: #2e7d32;
}

.activity-status.ongoing {
    background: #fff3e0;
    color: #f57c00;
}

.activity-status.past {
    background: #f5f5f5;
    color: #757575;
}

.featured-content h3 {
    font-size: 24px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.4;
}

.featured-card.large .featured-content h3 {
    font-size: 28px;
}

.activity-time,
.activity-location {
    font-size: 15px;
    color: #666;
    margin-bottom: 10px;
}

.activity-time i,
.activity-location i {
    color: #1e3c72;
    margin-right: 8px;
}

.activity-desc {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
}

.activity-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.participant-count {
    font-size: 14px;
    color: #999;
}

.participant-count i {
    margin-right: 5px;
}

/* 活动列表 */
.activities-list-section {
    padding: 80px 0;
    background: #fff;
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.activity-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.activity-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

.activity-card.past {
    opacity: 0.8;
}

.activity-card-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.activity-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.activity-card:hover .activity-card-image img {
    transform: scale(1.1);
}

.activity-date-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    min-width: 70px;
}

.activity-date-badge .day {
    display: block;
    font-size: 24px;
    font-weight: 700;
}

.activity-date-badge .month {
    display: block;
    font-size: 12px;
    margin-top: 5px;
}

.activity-card-content {
    padding: 25px;
}

.activity-card-content h3 {
    font-size: 20px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 600;
    line-height: 1.4;
}

.activity-card-content h3 a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.activity-card-content h3 a:hover {
    color: #1e3c72;
}

.activity-date {
    text-align: center;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.activity-date .day {
    display: block;
    font-size: 28px;
    font-weight: 700;
}

.activity-date .month {
    display: block;
    font-size: 12px;
    margin-top: 3px;
    opacity: 0.9;
}

.activity-info h3 {
    font-size: 16px;
    color: #333;
    margin-bottom: 8px;
    font-weight: 600;
}

.activity-info h3 a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.activity-info h3 a:hover {
    color: #1e3c72;
}

.activity-info p {
    font-size: 13px;
    color: #666;
    margin-bottom: 5px;
    line-height: 1.5;
}

.activity-info i {
    margin-right: 5px;
}

.activity-quota {
    font-size: 13px;
    color: #666;
}

.activity-card-content .activity-desc {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.activity-actions {
    display: flex;
    gap: 10px;
}

.activity-actions .btn {
    flex: 1;
    padding: 10px 20px;
    font-size: 14px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.page-btn {
    width: 45px;
    height: 45px;
    border: 2px solid #1e3c72;
    background: #fff;
    color: #1e3c72;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.page-btn:hover,
.page-btn.active {
    background: #1e3c72;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 60, 114, 0.3);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 活动统计 */
.activity-stats {
    padding: 15px 0;
    margin-top: -1px;
    margin-bottom: 30px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    border-radius: 0 0 10px 10px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.stat-item {
    text-align: center;
    padding: 10px 15px;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255,255,255,0.15);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 5px;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
}

/* 活动详情页 */
.activity-detail-section {
    padding: 40px 0 80px;
}

.activity-detail-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 40px;
}

.activity-main-content {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.activity-status-badge {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 25px;
}

.activity-status-badge.upcoming {
    background: #e8f5e9;
    color: #2e7d32;
}

.activity-status-badge.ongoing {
    background: #fff3e0;
    color: #f57c00;
}

.activity-status-badge.ended {
    background: #f5f5f5;
    color: #757575;
}

.activity-info-block {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
    padding: 25px;
    background: #f9f9f9;
    border-radius: 10px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.info-label {
    font-size: 13px;
    color: #999;
    font-weight: 500;
}

.info-value {
    font-size: 16px;
    color: #333;
    font-weight: 600;
}

.activity-content {
    margin-bottom: 40px;
}

.activity-content h2 {
    font-size: 24px;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #1e3c72;
}

.activity-description {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
}

.activity-description p {
    margin-bottom: 15px;
}

.activity-register-form {
    padding: 25px;
    background: #f9f9f9;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.activity-register-form h2 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: #666;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 6px;
    color: #333;
    font-size: 14px;
}

.form-group input::placeholder {
    color: #999;
}

.form-group input:focus {
    outline: none;
    border-color: #1e3c72;
}

.activity-register-form .btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.activity-register-form .btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 60, 114, 0.3);
}

.activity-register-form .btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.activity-sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.activity-sidebar-card {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.activity-sidebar-date {
    display: inline-block;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    padding: 12px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.activity-sidebar-date .day {
    display: block;
    font-size: 32px;
    font-weight: 700;
    line-height: 1;
}

.activity-sidebar-date .month {
    display: block;
    font-size: 14px;
    margin-top: 5px;
    opacity: 0.9;
}

.activity-sidebar-title {
    font-size: 20px;
    color: #333;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.4;
}

.activity-sidebar-meta p {
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
    line-height: 1.6;
}

.activity-sidebar-meta i {
    color: #1e3c72;
    margin-right: 8px;
}

.related-activities {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.related-activities h3 {
    font-size: 18px;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #f0f0f0;
}

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

.related-activity-item a {
    display: block;
    text-decoration: none;
    padding: 12px;
    background: #f9f9f9;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.related-activity-item a:hover {
    background: #1e3c72;
    transform: translateX(5px);
}

.related-activity-item a:hover .related-activity-date,
.related-activity-item a:hover .related-activity-title {
    color: #fff;
}

.related-activity-date {
    font-size: 13px;
    color: #1e3c72;
    margin-bottom: 5px;
    font-weight: 500;
}

.related-activity-title {
    font-size: 14px;
    color: #333;
    line-height: 1.4;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .featured-grid {
        grid-template-columns: 1fr 1fr;
    }

    .featured-card.large {
        grid-row: span 1;
    }
}

@media (max-width: 992px) {
    .activities-filter {
        top: 100px;
    }

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

    .featured-card.large .featured-image {
        height: 300px;
    }

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

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

    .activity-detail-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .activity-info-block {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-title {
        margin-top: 100px;
        padding: 20px 20px;
    }

    .page-title h1 {
        font-size: 22px;
        line-height: 1.2;
    }

    .activities-filter {
        position: static;
        padding: 20px 0;
    }

    .filter-tabs {
        flex-wrap: wrap;
        gap: 10px;
    }

    .filter-tab {
        padding: 10px 20px;
        font-size: 14px;
    }

    section {
        padding: 50px 0;
    }

    .featured-activities,
    .activities-list-section,
    .activity-stats {
        padding: 50px 0;
    }

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

    .activity-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .stat-item {
        padding: 15px;
    }

    .stat-number {
        font-size: 28px;
    }

    .stat-label {
        font-size: 13px;
    }

    .activity-detail-section {
        padding: 30px 0 60px;
    }

    .activity-main-content,
    .activity-sidebar-card,
    .related-activities {
        padding: 20px;
    }

    .activity-info-block {
        padding: 20px;
        grid-template-columns: 1fr;
    }

    .activity-content h2 {
        font-size: 20px;
    }

    .activity-register-form {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .page-title h1 {
        font-size: 18px;
        line-height: 1.2;
    }

    .breadcrumb {
        font-size: 11px;
    }

    .filter-tabs {
        justify-content: flex-start;
    }

    .filter-tab {
        padding: 8px 15px;
        font-size: 13px;
    }

    .featured-content {
        padding: 20px;
    }

    .featured-content h3 {
        font-size: 20px;
    }

    .activity-card-content {
        padding: 20px;
    }

    .activity-card-content h3 {
        font-size: 18px;
    }

    .activity-actions {
        flex-direction: column;
    }

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