:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-hover: #475569;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    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-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    position: relative;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.logo i {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-new {
    width: 100%;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-new:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-new i {
    width: 18px;
    height: 18px;
}

.search-box {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.search-box i {
    position: absolute;
    left: 40px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 10px 12px 10px 36px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

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

.sidebar-nav {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
}

.nav-item {
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 4px;
    transition: var(--transition);
    text-align: left;
}

.nav-item i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-item span:first-of-type {
    flex: 1;
}

.nav-item .count {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

.nav-item.active {
    background: var(--primary);
    color: white;
}

.nav-item.active .count {
    background: rgba(255, 255, 255, 0.2);
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

.stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
}

.stat-item i {
    width: 16px;
    height: 16px;
}

/* Main Content Styles */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
}

.header-left h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

.header-left p {
    color: var(--text-muted);
    font-size: 14px;
}

.header-right {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.btn-icon i {
    width: 20px;
    height: 20px;
}

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

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

.items-container {
    flex: 1;
    padding: 24px 32px;
    overflow-y: auto;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    width: 80px;
    height: 80px;
    margin-bottom: 24px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 24px;
}

/* Item Card Styles */
.item-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

.item-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--shadow);
}

.item-card:hover::before {
    opacity: 1;
}

.item-card.type-note::before {
    background: var(--secondary);
}

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

.item-title-section {
    flex: 1;
}

.item-type-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.item-type-badge i {
    width: 12px;
    height: 12px;
}

.item-type-badge.type-prompt {
    color: var(--primary-light);
}

.item-type-badge.type-note {
    color: var(--secondary);
}

.item-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.item-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

.item-meta i {
    width: 14px;
    height: 14px;
}

.item-actions {
    display: flex;
    gap: 4px;
}

.item-action-btn {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.item-action-btn i {
    width: 16px;
    height: 16px;
}

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

.item-action-btn.favorite.active {
    color: var(--warning);
}

.item-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.item-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
}

.item-category {
    padding: 4px 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 6px;
    font-size: 11px;
    color: white;
    font-weight: 600;
}

/* Grid View */
.items-container.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.items-container.grid-view .item-card {
    margin-bottom: 0;
}

/* Editor Panel */
.editor-panel {
    position: fixed;
    top: 0;
    right: -500px;
    width: 500px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    box-shadow: -4px 0 24px var(--shadow);
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.editor-panel.active {
    right: 0;
}

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

.editor-header h3 {
    font-size: 20px;
    font-weight: 700;
}

.editor-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.form-group {
    margin-bottom: 24px;
}

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

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 200px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

.type-selector {
    display: flex;
    gap: 12px;
}

.type-btn {
    flex: 1;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.type-btn i {
    width: 18px;
    height: 18px;
}

.type-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

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

.editor-actions {
    display: flex;
    gap: 12px;
    padding: 24px;
    border-top: 1px solid var(--border);
}

.btn-primary,
.btn-secondary {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary i {
    width: 18px;
    height: 18px;
}

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

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

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px var(--shadow);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateY(120%);
    transition: var(--transition);
    z-index: 2000;
}

.toast.show {
    transform: translateY(0);
}

.toast i {
    width: 20px;
    height: 20px;
    color: var(--success);
}

.toast span {
    font-size: 14px;
    font-weight: 500;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-hover);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        z-index: 999;
        height: 100vh;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .editor-panel {
        width: 100%;
        right: -100%;
    }
    
    .content-header {
        padding: 16px 20px;
    }
    
    .items-container {
        padding: 16px 20px;
    }
    
    .items-container.grid-view {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.item-card {
    animation: fadeIn 0.3s ease-out;
}

/* Print Styles */
@media print {
    .sidebar,
    .content-header,
    .editor-panel,
    .toast {
        display: none;
    }
    
    .main-content {
        width: 100%;
    }
    
    .item-card {
        page-break-inside: avoid;
        border: 1px solid #ddd;
        margin-bottom: 20px;
    }
}