/* Root Variables */
:root {
    --primary-color: #3b82f6;
    --secondary-color: #6366f1;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-tertiary: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #d1d5db;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

[data-theme="dark"] {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #4b5563;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Layout */
.app {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s;
}

.logo {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

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

.nav {
    flex: 1;
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
}

.nav-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
    border-left: 3px solid var(--secondary-color);
}

.nav-item .icon {
    font-size: 1.25rem;
}

.theme-toggle {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.theme-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.theme-btn:hover {
    background: var(--bg-tertiary);
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    padding: 1.5rem 2rem;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-bar {
    flex: 1;
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.view {
    display: none;
}

.view.active {
    display: block;
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: #2563eb;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

.btn-success:hover {
    background: #059669;
}

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

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

.btn-sm {
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
}

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

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

/* Bulk Actions */
.bulk-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.bulk-actions.hidden {
    display: none;
}

.bulk-actions span {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Memories List */
.memories-list {
    display: grid;
    gap: 1rem;
}

.memory-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all 0.2s;
    position: relative;
}

.memory-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.memory-card.selected {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

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

.memory-meta {
    flex: 1;
}

.memory-project {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.memory-date {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

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

.memory-text {
    margin-bottom: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.memory-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.memory-score {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.5rem;
    background: var(--success-color);
    color: white;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.bulk-checkbox {
    position: absolute;
    top: 1rem;
    left: 1rem;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding: 1rem;
}

#pageInfo {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
}

.stat-card h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.chart-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.chart-card h3 {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.chart {
    height: 300px;
}

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

.chart-label {
    min-width: 100px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.chart-bar-fill {
    flex: 1;
    height: 30px;
    background: var(--primary-color);
    border-radius: 0.25rem;
    position: relative;
    transition: width 0.3s;
}

.chart-value {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem 0;
}

.tag-cloud-item {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: all 0.2s;
    cursor: pointer;
}

.tag-cloud-item:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.tag-cloud-item.large {
    font-size: 1.25rem;
}

.tag-cloud-item.medium {
    font-size: 1rem;
}

/* Settings */
.settings-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.settings-section h2 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

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

.form-input {
    width: 100%;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea.form-input {
    resize: vertical;
    font-family: inherit;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

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

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

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

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

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

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

.preview-section {
    margin-top: 1.5rem;
}

.preview-section h4 {
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.preview {
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    min-height: 100px;
    color: var(--text-primary);
    white-space: pre-wrap;
}

/* Loading & Empty States */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

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

/* Responsive */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .nav {
        display: flex;
        overflow-x: auto;
        padding: 0;
    }

    .nav-item {
        flex-direction: column;
        gap: 0.25rem;
        padding: 0.75rem;
        font-size: 0.75rem;
        text-align: center;
    }

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

    .search-bar {
        flex-direction: column;
    }

    .filters {
        flex-direction: column;
    }

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

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