/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0070f3;
    --primary-dark: #0051cc;
    --success: #10b981;
    --success-dark: #059669;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --warning: #f59e0b;
    --secondary: #6b7280;
    --background: #f9fafb;
    --surface: #ffffff;
    --border: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.2s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
.header {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.header-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.header-status {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--secondary);
    animation: pulse 2s ease-in-out infinite;
}

.status-indicator.online {
    background: var(--success);
}

.status-indicator.offline {
    background: var(--danger);
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Main Content */
.main {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Controls */
.controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

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

.btn-icon {
    font-size: 18px;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--success-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-dark);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--background);
}

/* Stats Section */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--surface);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

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

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Stats Skeleton */
.stat-card.loading .stat-value {
    height: 44px;
    width: 80px;
    margin: 0 auto 8px;
    border-radius: 4px;
}

.stat-card.loading .stat-label {
    height: 16px;
    width: 100px;
    margin: 0 auto;
    border-radius: 4px;
}

/* Items Section */
.items {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
}

.items-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

/* Item Card */
.item-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.item-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Subtle click hint animation - corner indicator */
.item-card::before {
    content: '';
    position: absolute;
    top: 12px;
    right: 12px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0;
    transition: all 0.3s ease;
}

.item-card:hover::before {
    opacity: 1;
    animation: pulse-dot 1.5s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 12px;
}

.item-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
    max-width: 100%;
}

.item-status {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    white-space: nowrap;
}

.item-status.active {
    background: #d1fae5;
    color: #065f46;
}

.item-status.pending {
    background: #fef3c7;
    color: #92400e;
}

.item-status.inactive {
    background: #fee2e2;
    color: #991b1b;
}

.item-description {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    word-break: break-word;
    max-width: 100%;
}

.item-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.item-actions {
    display: flex;
    gap: 8px;
    position: relative;
}

.item-actions .btn {
    flex: 1;
    justify-content: center;
    padding: 8px 12px;
    font-size: 13px;
    position: relative;
    z-index: 1;
}

/* Loading State */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.loading.active {
    display: block;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 16px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Skeleton Loading */
.skeleton-container {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.skeleton-container.active {
    display: grid;
}

.skeleton-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    animation: skeleton-fade 1s ease-in-out;
}

@keyframes skeleton-fade {
    from { opacity: 0; }
    to { opacity: 1; }
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--border) 0%,
        #f0f0f0 50%,
        var(--border) 100%
    );
    background-size: 200% 100%;
    border-radius: 4px;
    animation: skeleton-wave 1.5s ease-in-out infinite;
}

@keyframes skeleton-wave {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
}

.skeleton-status {
    height: 24px;
    width: 80px;
    border-radius: 12px;
}

.skeleton-description {
    height: 16px;
    width: 100%;
    margin-bottom: 8px;
}

.skeleton-description:last-of-type {
    width: 75%;
    margin-bottom: 16px;
}

.skeleton-meta {
    height: 14px;
    width: 50%;
    margin-bottom: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.skeleton-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.skeleton-button {
    flex: 1;
    height: 36px;
    border-radius: var(--radius);
}

/* Empty State */
.empty-state {
    display: none;
    text-align: center;
    padding: 60px 20px;
}

.empty-state.active {
    display: block;
}

.empty-state p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.pagination-info {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--surface);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--background);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding: 20px 24px;
    border-top: 1px solid var(--border);
}

/* Details Modal Specific */
.details-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 14px;
    color: var(--text-primary);
    word-break: break-word;
}

.detail-value.empty {
    color: var(--text-secondary);
    font-style: italic;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--text-primary);
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 2000;
    max-width: 400px;
}

.toast.active {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--danger);
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-title {
        font-size: 24px;
    }

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

    .items-list {
        grid-template-columns: 1fr;
    }

    .controls {
        width: 100%;
    }

    .controls .btn {
        flex: 1;
    }

    .toast {
        left: 12px;
        right: 12px;
        bottom: 12px;
    }
}

@media (max-width: 480px) {
    .stats {
        grid-template-columns: 1fr;
    }

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

    .pagination {
        flex-direction: column;
    }
}