/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
}

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

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    color: white;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    margin-bottom: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.logo-img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
}

.tagline {
    opacity: 0.9;
    margin-top: 0.5rem;
    font-size: 1rem;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom: 2rem;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

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

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

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

.btn-success:hover {
    background: #16a34a;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-icon {
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-icon:hover {
    background: var(--surface-hover);
}

.btn .icon {
    font-size: 1.1rem;
}

/* Palaces Grid */
.palaces-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

/* Palace Card */
.palace-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.palace-card-header {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.palace-icon {
    font-size: 2rem;
}

.palace-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.palace-card-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.palace-card-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.empty-state-small {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

/* Palace Detail View */
.palace-detail {
    background: var(--surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.detail-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.detail-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 200px;
}

.palace-icon-large {
    font-size: 2.5rem;
}

.detail-title h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

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

/* Locations Section */
.locations-section {
    padding: 1.25rem;
}

.locations-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Location Card */
.location-card {
    background: var(--background);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.location-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.location-card-header:hover {
    background: var(--surface-hover);
}

.location-icon {
    font-size: 1.75rem;
}

.location-info {
    flex: 1;
}

.location-info h4 {
    font-size: 1rem;
    font-weight: 600;
}

.location-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.location-actions .btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
}

.location-objects {
    padding: 0 1rem 1rem 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--surface);
}

.objects-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.objects-header h5 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.objects-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Object Item */
.object-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--background);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.object-icon {
    font-size: 1.5rem;
}

.object-info {
    flex: 1;
}

.object-info h6 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.object-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.object-actions {
    display: flex;
    gap: 0.25rem;
}

.object-actions .btn {
    padding: 0.3rem 0.5rem;
    font-size: 0.7rem;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    line-height: 1;
}

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

/* Forms */
form {
    padding: 1.25rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: var(--transition);
    font-family: inherit;
}

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

.form-group textarea {
    resize: vertical;
}

/* Icon Selector */
.icon-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.icon-option {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
    transition: var(--transition);
}

.icon-option:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.icon-option.selected {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding-top: 0.5rem;
}

/* Visualize Tab */
.palace-viewer {
    background: var(--surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.viewer-header h2 {
    font-size: 1.25rem;
}

.viewer-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#location-counter {
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-width: 60px;
    text-align: center;
}

.visualization-container {
    padding: 2rem 1.25rem;
    min-height: 300px;
}

.location-display {
    text-align: center;
}

.location-display .location-header {
    margin-bottom: 1rem;
}

.location-display .location-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 0.5rem;
}

.location-display h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

.location-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.objects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    text-align: left;
}

.object-card {
    background: var(--background);
    border-radius: var(--radius-md);
    padding: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.object-card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.object-card-header span {
    font-size: 1.5rem;
}

.object-card-header h4 {
    font-size: 1rem;
    font-weight: 600;
}

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

.location-nav-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.nav-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.nav-dot:hover {
    background: var(--primary-light);
}

.nav-dot.active {
    background: var(--primary-color);
    transform: scale(1.2);
}

/* Review Tab */
.palace-select {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

.palace-select-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.palace-select-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.palace-select-btn span {
    font-size: 1.25rem;
}

.review-area {
    background: var(--surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.review-header h2 {
    font-size: 1.25rem;
}

.review-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.review-card {
    padding: 3rem 1.25rem;
    text-align: center;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-front,
.card-back {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.card-front.hidden,
.card-back.hidden {
    display: none;
}

.review-location {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: var(--background);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
}

.review-object {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.review-prompt {
    color: var(--text-secondary);
    margin: 1rem 0;
}

.review-answer {
    font-size: 1.25rem;
    color: var(--text-primary);
    padding: 1.5rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    max-width: 400px;
}

.review-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.review-complete {
    padding: 3rem 1.25rem;
    text-align: center;
}

.complete-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.review-complete h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.review-complete p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.review-complete .btn {
    margin: 0.25rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 5rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1100;
    animation: slideUp 0.3s ease;
}

.toast.hidden {
    display: none;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

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

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .logo-img {
        width: 36px;
        height: 36px;
    }

    .nav-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
    }

    .tab-btn {
        white-space: nowrap;
        padding: 0.625rem 0.875rem;
        font-size: 0.85rem;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .section-header .btn {
        width: 100%;
    }

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

    .detail-header {
        flex-direction: column;
        align-items: stretch;
    }

    .detail-title {
        order: -1;
    }

    #back-to-list {
        align-self: flex-start;
    }

    .detail-actions {
        justify-content: stretch;
    }

    .detail-actions .btn {
        flex: 1;
    }

    .location-card-header {
        flex-wrap: wrap;
    }

    .location-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 0.5rem;
    }

    .object-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .object-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 0.5rem;
    }

    .viewer-header {
        flex-direction: column;
        align-items: stretch;
    }

    .viewer-controls {
        justify-content: center;
    }

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

    .review-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .review-buttons .btn {
        width: 100%;
    }

    .modal-content {
        max-height: 95vh;
    }

    .icon-selector {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0 0.5rem;
    }

    .header h1 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    .empty-icon {
        font-size: 3rem;
    }

    .empty-state h3 {
        font-size: 1.1rem;
    }

    .palace-icon-large {
        font-size: 2rem;
    }

    .location-display .location-icon {
        font-size: 3rem;
    }

    .location-display h3 {
        font-size: 1.25rem;
    }

    .review-object {
        font-size: 1.5rem;
    }

    .review-answer {
        font-size: 1rem;
        padding: 1rem;
    }
}

/* Print styles */
@media print {
    .header,
    .nav-tabs,
    .footer,
    .btn {
        display: none !important;
    }

    .app-container {
        max-width: 100%;
    }

    .palace-card,
    .location-card,
    .object-item {
        break-inside: avoid;
    }
}