:root {
    --primary-color: #1E88E5;
    --primary-dark: #1565C0;
    --primary-light: #64B5F6;
    --success-color: #43A047;
    --warning-color: #FB8C00;
    --error-color: #E53935;
    --text-color: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #E0E0E0;
    --bg-color: #F5F5F5;
    --bg-white: #FFFFFF;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: "Source Han Sans CN", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group label .required {
    color: var(--error-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.15);
}

.form-group .help-text {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-muted);
}

.form-group .error-text {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--error-color);
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background-color: #E8F5E9;
    color: var(--success-color);
}

.alert-error {
    background-color: #FFEBEE;
    color: var(--error-color);
}

.alert-warning {
    background-color: #FFF3E0;
    color: var(--warning-color);
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.page-header h1 i {
    margin-right: 10px;
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 12px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
}

.pagination-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.pagination {
    display: flex;
    gap: 8px;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-color);
    transition: all 0.2s;
}

.page-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-link.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.main-header {
    background-color: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

.main-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.user-nav {
    position: relative;
}

.user-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    min-width: 160px;
    padding: 8px 0;
}

.user-nav:hover .user-dropdown {
    display: block;
}

.user-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--text-color);
    border: none;
}

.user-dropdown a:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: -280px;
    width: 280px;
    height: 100vh;
    background: white;
    z-index: 1000;
    transition: left 0.3s;
    overflow-y: auto;
}

.mobile-nav.active {
    left: 0;
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

.mobile-overlay.active {
    display: block;
}

.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 100;
}

.mobile-bottom-nav a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px;
    color: var(--text-muted);
    font-size: 11px;
}

.mobile-bottom-nav a i {
    font-size: 20px;
    margin-bottom: 4px;
}

.mobile-bottom-nav a.active {
    color: var(--primary-color);
}

.main-footer {
    background: #2C3E50;
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h4 {
    margin-bottom: 16px;
    font-size: 16px;
}

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

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255,255,255,0.7);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    font-size: 13px;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 12px;
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-secondary);
}

.badge-primary {
    background: var(--primary-color);
    color: white;
}

.badge-success {
    background: var(--success-color);
    color: white;
}

.badge-warning {
    background: var(--warning-color);
    color: white;
}

.badge-error {
    background: var(--error-color);
    color: white;
}

.badge-vip {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #333;
}

.text-success {
    color: var(--success-color);
}

.text-error {
    color: var(--error-color);
}

@media (max-width: 992px) {
    .main-nav {
        display: none;
    }

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

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

    .mobile-bottom-nav {
        display: flex;
    }

    .main-content {
        padding-bottom: 70px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 12px;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

.hero-section {
    position: relative;
    height: 400px;
    overflow: hidden;
}

.banner-slider {
    position: relative;
    height: 100%;
}

.banner-slides {
    position: relative;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.5s;
}

.banner-slide.active {
    opacity: 1;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(30, 136, 229, 0.8), rgba(21, 101, 192, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-content {
    text-align: center;
    color: white;
}

.banner-content h2 {
    font-size: 36px;
    margin-bottom: 12px;
}

.banner-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
}

.banner-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
}

.banner-dot.active {
    background: white;
}

.banner-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
}

.banner-placeholder h2 {
    font-size: 32px;
    margin-bottom: 8px;
}

.banner-placeholder p {
    font-size: 18px;
    opacity: 0.9;
}

.announcement-section {
    background: white;
    padding: 16px 0;
    box-shadow: var(--shadow-sm);
}

.announcement-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
}

.announcement-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
    white-space: nowrap;
}

.announcement-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.announcement-item {
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-badge {
    background: var(--error-color);
    color: white;
    font-size: 11px;
    padding: 1px 6px;
    border-radius: 3px;
}

.more-link {
    color: var(--text-muted);
    font-size: 13px;
    white-space: nowrap;
}

.more-link:hover {
    color: var(--primary-color);
}

.stats-section {
    padding: 40px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 24px;
    color: white;
}

.bg-blue { background: var(--primary-color); }
.bg-green { background: var(--success-color); }
.bg-orange { background: var(--warning-color); }
.bg-purple { background: #9C27B0; }
.bg-red { background: var(--error-color); }
.bg-teal { background: #00897B; }

.stat-info {
    flex: 1;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-color);
}

.stat-text {
    color: var(--text-muted);
    font-size: 14px;
}

section {
    padding: 40px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.section-header h2 {
    font-size: 22px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header h2 i {
    color: var(--primary-color);
}

.events-grid,
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.event-card,
.course-card,
.gallery-item {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

.event-card:hover,
.course-card:hover,
.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.event-poster,
.course-cover {
    position: relative;
    height: 160px;
    background: var(--bg-color);
    overflow: hidden;
}

.event-poster img,
.course-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.poster-placeholder,
.cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--text-muted);
}

.event-type-badge,
.course-type-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary-color);
    color: white;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 12px;
}

.event-status-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 12px;
    color: white;
}

.status-registering { background: var(--success-color); }
.status-ongoing { background: var(--primary-color); }
.status-finished { background: var(--text-muted); }
.status-pending { background: var(--warning-color); }

.event-info,
.course-content {
    padding: 16px;
}

.event-info h3,
.course-content h3 {
    font-size: 16px;
    margin-bottom: 10px;
}

.event-info h3 a,
.course-content h3 a {
    color: var(--text-color);
}

.event-info h3 a:hover,
.course-content h3 a:hover {
    color: var(--primary-color);
}

.event-meta,
.course-meta {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 12px;
}

.event-time {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.countdown {
    color: var(--error-color);
    font-weight: 500;
}

.event-footer {
    padding: 0 16px 16px;
}

.course-description {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gallery-grid {
    grid-template-columns: repeat(4, 1fr);
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
}

.gallery-media {
    width: 100%;
    height: 100%;
    position: relative;
}

.gallery-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.media-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--text-muted);
    background: var(--bg-color);
}

.media-type-badge {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.6);
    color: white;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 12px;
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    opacity: 0;
    transition: opacity 0.2s;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay h4 {
    font-size: 14px;
    margin-bottom: 4px;
}

.gallery-overlay p {
    font-size: 12px;
    opacity: 0.8;
}

.gallery-stats {
    display: flex;
    gap: 12px;
    margin-top: 6px;
    font-size: 12px;
}

.gallery-link {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.about-section {
    background: white;
    padding: 60px 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text h2 {
    font-size: 28px;
    margin-bottom: 16px;
}

.about-text > p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.feature-item i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.feature-item h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 13px;
    color: var(--text-muted);
}

.filter-bar {
    background: white;
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.filter-row {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.filter-group {
    min-width: 150px;
}

.filter-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.filter-group select,
.filter-group input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.search-group {
    flex: 1;
    min-width: 200px;
}

.login-page,
.register-page,
.forgot-password-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: 40px 20px;
}

.login-container,
.register-container,
.forgot-password-container {
    width: 100%;
    max-width: 900px;
}

.login-box,
.register-box,
.forgot-password-box {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.login-header,
.register-header,
.forgot-password-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1,
.register-header h1 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.login-header p,
.register-header p {
    color: var(--text-muted);
}

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.input-wrapper input {
    padding-left: 40px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 6px;
}

.remember-me input {
    width: auto;
}

.forgot-password a,
.login-footer p,
.register-footer p {
    color: var(--text-secondary);
}

.role-select {
    display: flex;
    gap: 16px;
}

.role-option {
    flex: 1;
    cursor: pointer;
}

.role-option input {
    display: none;
}

.role-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.role-option input:checked + .role-card {
    border-color: var(--primary-color);
    background: rgba(30, 136, 229, 0.05);
}

.role-card i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.form-row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.phone-input-group,
.sms-input-group {
    display: flex;
    gap: 10px;
}

.phone-input-group input,
.sms-input-group input {
    flex: 1;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input {
    width: auto;
}

.profile-page {
    padding: 30px 0;
}

.profile-content {
    display: grid;
    gap: 24px;
}

.profile-section {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .hero-section {
        height: 300px;
    }

    .banner-content h2 {
        font-size: 24px;
    }

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

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

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

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

    .form-row-2 {
        grid-template-columns: 1fr;
    }

    .login-box,
    .register-box {
        padding: 24px;
    }

    .role-select {
        flex-direction: column;
    }
}