/* My Papers Specific Styles */

/* Main Content Container */
.my-papers-content {
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Stats Grid */
.papers-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--primary-white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

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

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card.total-papers::before {
    background: linear-gradient(135deg, var(--accent-blue), #1d4ed8);
}

.stat-card.approved-papers::before {
    background: linear-gradient(135deg, var(--accent-green), #059669);
}

.stat-card.total-downloads::before {
    background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
}

.stat-card.credits-earned::before {
    background: linear-gradient(135deg, var(--accent-yellow), #d97706);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-white);
}

.total-papers .stat-icon {
    background: linear-gradient(135deg, var(--accent-blue), #1d4ed8);
}

.approved-papers .stat-icon {
    background: linear-gradient(135deg, var(--accent-green), #059669);
}

.total-downloads .stat-icon {
    background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
}

.credits-earned .stat-icon {
    background: linear-gradient(135deg, var(--accent-yellow), #d97706);
}

.stat-content h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-black);
    margin: 0 0 0.25rem 0;
    line-height: 1;
}

.stat-content p {
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-trend {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
}

.stat-trend.positive {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.stat-trend.negative {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.stat-percentage {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
}

.stat-value {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-yellow);
}

/* Controls Section */
.papers-controls {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--primary-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    gap: 1rem;
}

.controls-left {
    display: flex;
    gap: 1.5rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.controls-right {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 140px;
}

.filter-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.filter-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    background: var(--primary-white);
    color: var(--primary-black);
    font-size: 0.875rem;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.view-toggle {
    display: flex;
    background: var(--gray-100);
    border-radius: 6px;
    padding: 0.25rem;
}

.view-btn {
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--gray-600);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.view-btn.active,
.view-btn:hover {
    background: var(--primary-white);
    color: var(--primary-black);
    box-shadow: var(--shadow-sm);
}

/* Papers Container */
.papers-container {
    position: relative;
    min-height: 400px;
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.papers-grid.list-view {
    grid-template-columns: 1fr;
    gap: 1rem;
}

/* Paper Card */
.paper-card {
    background: var(--primary-white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.paper-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.paper-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.paper-card:hover::before {
    transform: scaleX(1);
}

.paper-card.list-view {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    padding: 1rem 1.5rem;
}

.paper-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.paper-type {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.paper-status {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.paper-status.pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-yellow);
}

.paper-status.approved {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.paper-status.rejected {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.paper-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-black);
    margin: 0 0 1rem 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.paper-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.paper-meta-item i {
    width: 16px;
    color: var(--gray-400);
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.paper-tag {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
}

.paper-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
}

.paper-stats {
    display: flex;
    gap: 1rem;
}

.paper-stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.paper-stat i {
    color: var(--gray-400);
}

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

.paper-action-btn {
    padding: 0.375rem 0.75rem;
    border: none;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.paper-action-btn.view {
    background: var(--accent-blue);
    color: var(--primary-white);
}

.paper-action-btn.edit {
    background: var(--gray-100);
    color: var(--gray-700);
}

.paper-action-btn.delete {
    background: var(--accent-red);
    color: var(--primary-white);
}

.paper-action-btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--primary-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.empty-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--gray-400);
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-black);
    margin: 0 0 0.5rem 0;
}

.empty-state p {
    color: var(--gray-600);
    margin: 0 0 1.5rem 0;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: 4rem 2rem;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    position: relative;
}

.spinner {
    width: 100%;
    height: 100%;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-state p {
    color: var(--gray-600);
    font-weight: 500;
}

/* Pagination */
.pagination-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
}

.pagination {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--primary-white);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.pagination-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--gray-300);
    background: var(--primary-white);
    color: var(--gray-700);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

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

.pagination-info {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--primary-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    position: relative;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.paper-detail-modal {
    max-width: 800px;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.modal-title {
    flex: 1;
}

.modal-title h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-black);
    margin: 0 0 0.5rem 0;
}

.paper-status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.paper-status-badge.pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-yellow);
}

.paper-status-badge.approved {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.paper-status-badge.rejected {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.modal-close {
    padding: 0.5rem;
    border: none;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    margin-left: 1rem;
}

.modal-close:hover {
    background: var(--gray-200);
    color: var(--primary-black);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Button Styles */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    text-align: center;
    justify-content: center;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

/* Toast Styles */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
}

.toast {
    background: var(--primary-white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--accent-green);
}

.toast.error {
    border-left: 4px solid var(--accent-red);
}

.toast.info {
    border-left: 4px solid var(--accent-blue);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Comprehensive Responsive Design */

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .my-papers-content {
        padding: 2.5rem;
        max-width: 1600px;
    }
    
    .papers-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 2rem;
    }
    
    .papers-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
        gap: 2rem;
    }
}

/* Desktop (1200px - 1439px) */
@media (max-width: 1439px) {
    .my-papers-content {
        padding: 2rem;
    }
    
    .papers-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
    }
    
    .papers-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

/* Tablet Landscape (1024px - 1199px) */
@media (max-width: 1199px) {
    .my-papers-content {
        padding: 1.5rem;
    }
    
    .papers-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .papers-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

/* Tablet Portrait (768px - 1023px) */
@media (max-width: 1023px) {
    .my-papers-content {
        padding: 1.25rem;
    }
    
    .papers-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.25rem;
    }
    
    .papers-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        padding: 1.25rem;
    }

    .controls-left {
        flex-direction: column;
        gap: 1rem;
    }

    .controls-right {
        justify-content: center;
        gap: 0.75rem;
    }
    
    .papers-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.25rem;
    }
}

/* Mobile Landscape & Large Mobile (481px - 767px) */
@media (max-width: 767px) {
    .my-papers-content {
        padding: 1rem;
    }

    .papers-stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .stat-card {
        padding: 1.25rem;
        text-align: center;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .stat-label {
        font-size: 0.85rem;
    }

    .papers-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        padding: 1rem;
    }

    .controls-left {
        flex-direction: column;
        gap: 1rem;
    }

    .controls-right {
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .search-input {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    .filter-btn, .sort-btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }

    .papers-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .paper-card {
        padding: 1.25rem;
    }
    
    .paper-title {
        font-size: 1rem;
        line-height: 1.3;
    }
    
    .paper-meta {
        font-size: 0.8rem;
    }

    .paper-card.list-view {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .paper-stats {
        gap: 0.75rem;
    }
    
    .stat {
        font-size: 0.75rem;
    }

    .modal-content {
        margin: 1rem;
        max-height: calc(100vh - 2rem);
        border-radius: 12px;
    }

    .modal-footer {
        flex-direction: column;
        gap: 0.75rem;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        max-width: none;
        top: 10px;
    }

    .toast {
        min-width: auto;
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }
}

/* Mobile Portrait (320px - 480px) */
@media (max-width: 480px) {
    .my-papers-content {
        padding: 0.75rem;
    }
    
    .page-title {
        font-size: 1.5rem;
        line-height: 1.1;
    }

    .stat-card {
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }

    .papers-controls {
        padding: 0.75rem;
        gap: 0.75rem;
    }
    
    .controls-left {
        gap: 0.75rem;
    }
    
    .search-input {
        padding: 0.6rem;
        font-size: 0.85rem;
    }
    
    .filter-btn, .sort-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }

    .paper-card {
        padding: 1rem;
    }
    
    .paper-title {
        font-size: 0.9rem;
    }
    
    .paper-meta {
        font-size: 0.75rem;
    }
    
    .paper-stats {
        gap: 0.5rem;
        flex-wrap: wrap;
    }
    
    .stat {
        font-size: 0.7rem;
    }
    
    .paper-actions {
        gap: 0.25rem;
    }
    
    .action-btn {
        padding: 0.4rem;
        font-size: 0.75rem;
    }

    .modal-content {
        margin: 0.5rem;
        max-height: calc(100vh - 1rem);
        border-radius: 8px;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 0.75rem;
    }
    
    .modal-title {
        font-size: 1rem;
    }
    
    .toast-container {
        left: 0.5rem;
        right: 0.5rem;
    }
    
    .toast {
        padding: 0.6rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }
    
    .btn-sm {
        padding: 0.4rem 0.75rem;
        font-size: 0.75rem;
    }
}

/* Small Mobile (320px - 375px) */
@media (max-width: 375px) {
    .my-papers-content {
        padding: 0.5rem;
    }
    
    .page-title {
        font-size: 1.3rem;
    }
    
    .stat-card {
        padding: 0.75rem;
    }
    
    .stat-number {
        font-size: 1.6rem;
    }
    
    .paper-card {
        padding: 0.75rem;
    }
    
    .paper-title {
        font-size: 0.85rem;
    }
    
    .modal-content {
        border-radius: 6px;
    }
    
    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }
}

/* Landscape orientation fixes */
@media (max-height: 500px) and (orientation: landscape) {
    .my-papers-content {
        padding: 1rem;
    }
    
    .papers-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }
    
    .stat-card {
        padding: 0.75rem;
    }
    
    .papers-controls {
        padding: 0.75rem;
    }
    
    .modal-content {
        max-height: 85vh;
    }
}