/* Certificates Page Styles */
.certificates-page-content {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.header-stats {
    display: flex;
    gap: 2rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Certificate Filters */
.certificate-filters {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    transition: all 0.3s;
}

.filter-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
}

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

.filter-btn .count {
    background: rgba(0, 0, 0, 0.1);
    padding: 0.125rem 0.375rem;
    border-radius: 10px;
    font-size: 0.75rem;
}

.filter-btn.active .count {
    background: rgba(255, 255, 255, 0.2);
}

/* Recent Certificates */
.recent-certificates {
    margin-bottom: 3rem;
}

.recent-certificates h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.certificate-card {
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    position: relative;
    transition: all 0.3s;
}

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

.certificate-card.featured {
    border: 2px solid var(--primary-color);
}

.certificate-ribbon {
    position: absolute;
    top: 1rem;
    right: -2rem;
    background: var(--danger-color);
    color: white;
    padding: 0.375rem 2.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    transform: rotate(45deg);
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Certificate Template Preview */
.certificate-preview {
    padding: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.certificate-template {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    position: relative;
    min-height: 200px;
}

.certificate-template.design {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.certificate-template.design .cert-header,
.certificate-template.design .cert-body,
.certificate-template.design .cert-footer {
    color: white;
}

.cert-header {
    margin-bottom: 1rem;
}

.cert-header i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.cert-header h3 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin: 0;
}

.cert-body h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0.5rem 0;
}

.cert-body p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.cert-date {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 1rem;
}

.cert-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
}

.cert-seal {
    width: 50px;
    height: 50px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-seal i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.cert-signature {
    font-family: cursive;
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Certificate Info */
.certificate-info {
    padding: 1.5rem;
}

.certificate-info h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.instructor {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.certificate-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.certificate-meta span {
    font-size: 0.813rem;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.certificate-grade {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.grade {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success-color);
}

.score {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.certificate-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-view,
.btn-download,
.btn-share {
    flex: 1;
    padding: 0.625rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    transition: all 0.3s;
}

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

.btn-download:hover {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.btn-share {
    width: 40px;
    padding: 0.625rem;
}

.btn-share:hover {
    background: var(--info-color);
    color: white;
    border-color: var(--info-color);
}

/* All Certificates */
.all-certificates {
    margin-bottom: 3rem;
}

.all-certificates h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.certificate-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s;
}

.certificate-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.certificate-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.certificate-icon i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.certificate-details {
    flex: 1;
}

.certificate-details h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.certificate-details p {
    font-size: 0.813rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.cert-date {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.certificate-actions-mini {
    display: flex;
    gap: 0.5rem;
}

.btn-action {
    width: 32px;
    height: 32px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

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

/* Achievement Section */
.achievement-section {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.achievement-section h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.achievement-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all 0.3s;
}

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

.achievement-card.locked {
    opacity: 0.5;
}

.achievement-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.achievement-icon i {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.achievement-icon.gold i {
    color: #fbbf24;
}

.achievement-icon.silver i {
    color: #9ca3af;
}

.achievement-icon.bronze i {
    color: #d97706;
}

.achievement-card h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.achievement-card p {
    font-size: 0.813rem;
    color: var(--text-secondary);
}

/* Dark Theme */
body.dark-theme .certificate-card,
body.dark-theme .certificate-item,
body.dark-theme .achievement-section {
    background: var(--bg-primary);
}

body.dark-theme .certificate-template {
    background: var(--bg-secondary);
}

body.dark-theme .filter-btn {
    background: var(--bg-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .certificates-page-content {
        padding: 1rem;
        padding-bottom: 80px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .header-stats {
        width: 100%;
        justify-content: flex-start;
        gap: 1.5rem;
    }
    
    .stat-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .stat-item i {
        margin-bottom: 0.5rem;
    }
    
    /* 수료증 필터 */
    .certificate-filters {
        gap: 0.5rem;
        padding: 0 0 0.5rem 0;
        -webkit-overflow-scrolling: touch;
    }
    
    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.813rem;
    }
    
    .filter-btn .count {
        padding: 0.125rem 0.25rem;
        font-size: 0.688rem;
    }
    
    /* 최근 수료증 */
    .recent-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .certificate-preview {
        padding: 1rem;
    }
    
    .certificate-template {
        min-height: 180px;
        padding: 1rem;
    }
    
    .cert-header i {
        font-size: 1.5rem;
    }
    
    .cert-body h4 {
        font-size: 1rem;
    }
    
    /* 모든 수료증 */
    .certificates-grid {
        grid-template-columns: 1fr;
    }
    
    .certificate-item {
        padding: 0.875rem;
    }
    
    /* 성취도 */
    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .achievement-card {
        padding: 1rem;
    }
    
    .achievement-icon {
        width: 50px;
        height: 50px;
    }
    
    .achievement-card h4 {
        font-size: 0.875rem;
    }
    
    .achievement-card p {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .certificates-page-content {
        padding: 0.75rem;
        padding-bottom: 70px;
    }
    
    .page-header h1 {
        font-size: 1.25rem;
    }
    
    .page-header p {
        font-size: 0.813rem;
    }
    
    .header-stats {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        background: var(--bg-secondary);
        border-radius: 8px;
    }
    
    .stat-item {
        flex-direction: row;
        width: 100%;
        justify-content: space-between;
    }
    
    /* 필터 */
    .certificate-filters {
        padding: 0.5rem 0;
    }
    
    .filter-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
    
    /* 수료증 카드 */
    .certificate-card {
        border-radius: 8px;
    }
    
    .certificate-ribbon {
        font-size: 0.625rem;
        padding: 0.25rem 2rem;
    }
    
    .certificate-info {
        padding: 1rem;
    }
    
    .certificate-info h3 {
        font-size: 1rem;
    }
    
    .certificate-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn-view,
    .btn-download,
    .btn-share {
        width: 100%;
        padding: 0.5rem;
        font-size: 0.813rem;
    }
    
    /* 성취도 */
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .achievement-section {
        padding: 1rem;
    }
    
    /* 모든 수료증 리스트 */
    .certificate-item {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    
    .certificate-details {
        width: 100%;
    }
    
    .certificate-actions-mini {
        width: 100%;
        justify-content: flex-end;
    }
}