/* Base Styles and Variables */
:root {
    /* Primary colors */
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --accent-color: #9C27B0;
    
    /* Light theme */
    --background-light: #f8f9fa;
    --surface-light: #ffffff;
    --text-primary-light: #212121;
    --text-secondary-light: #757575;
    --border-light: #e0e0e0;
    --divider-light: #f0f0f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    
    /* Dark theme */
    --background-dark: #121212;
    --surface-dark: #1e1e1e;
    --text-primary-dark: #f5f5f5;
    --text-secondary-dark: #b0b0b0;
    --border-dark: #333333;
    --divider-dark: #2a2a2a;
    --shadow-dark: rgba(0, 0, 0, 0.3);
    
    /* Y2K aesthetic accents */
    --gradient-1: linear-gradient(135deg, #2196F3, #9C27B0);
    --gradient-2: linear-gradient(135deg, #FFC107, #F44336);
    --bubble-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Font sizes */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
}

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

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Theme Styles */
body.light-theme {
    background-color: var(--background-light);
    color: var(--text-primary-light);
}

body.dark-theme {
    background-color: var(--background-dark);
    color: var(--text-primary-dark);
}

/* Container Styles */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 40px); /* Account for footer */
}

/* Header Styles */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 2px 10px var(--shadow-light);
    position: relative;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo i {
    font-size: var(--font-size-xl);
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Main Content Styles */
.app-main {
    display: flex;
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 300px;
    background-color: var(--surface-light);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.dark-theme .sidebar {
    background-color: var(--surface-dark);
    border-right-color: var(--border-dark);
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--divider-light);
}

.dark-theme .sidebar-header {
    border-bottom-color: var(--divider-dark);
}

.sidebar-header h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.sidebar-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.search-container {
    position: relative;
}

.search-container input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 2.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-light);
    background-color: var(--surface-light);
    color: var(--text-primary-light);
    transition: border-color var(--transition-fast);
}

.dark-theme .search-container input {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
    color: var(--text-primary-dark);
}

.search-container i {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary-light);
}

.dark-theme .search-container i {
    color: var(--text-secondary-dark);
}

#sortNotes {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-light);
    background-color: var(--surface-light);
    color: var(--text-primary-light);
    cursor: pointer;
}

.dark-theme #sortNotes {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
    color: var(--text-primary-dark);
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.note-card {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    background-color: var(--surface-light);
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
}

.dark-theme .note-card {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.note-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-light);
}

.dark-theme .note-card:hover {
    box-shadow: 0 4px 8px var(--shadow-dark);
}

.note-card.active {
    border-left: 4px solid var(--primary-color);
    background-color: rgba(33, 150, 243, 0.05);
}

.dark-theme .note-card.active {
    background-color: rgba(33, 150, 243, 0.1);
}

.note-card.pinned {
    border-left: 4px solid var(--warning-color);
}

.note-card-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 24px; /* Space for star icon */
}

.note-card-date {
    font-size: var(--font-size-xs);
    color: var(--text-secondary-light);
}

.dark-theme .note-card-date {
    color: var(--text-secondary-dark);
}

.note-card-preview {
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-secondary-light);
}

.dark-theme .note-card-preview {
    color: var(--text-secondary-dark);
}

.note-card-actions {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
}

.note-card-actions button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary-light);
    transition: color var(--transition-fast);
    font-size: var(--font-size-md);
}

.dark-theme .note-card-actions button {
    color: var(--text-secondary-dark);
}

.note-card-actions button:hover {
    color: var(--primary-color);
}

.note-card-actions button.pin-btn.pinned,
.note-card-actions button.pin-btn:hover {
    color: var(--warning-color);
}

.note-card-actions button.delete-btn:hover {
    color: var(--danger-color);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary-light);
    text-align: center;
    padding: var(--spacing-xl);
}

.dark-theme .empty-state {
    color: var(--text-secondary-dark);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Editor Styles */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--surface-light);
    transition: background-color var(--transition-normal);
}

.dark-theme .editor-container {
    background-color: var(--surface-dark);
}

.editor-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--divider-light);
}

.dark-theme .editor-header {
    border-bottom-color: var(--divider-dark);
}

#noteTitle {
    width: 100%;
    font-size: var(--font-size-xl);
    padding: var(--spacing-sm) 0;
    border: none;
    background: transparent;
    color: var(--text-primary-light);
    font-weight: 600;
    outline: none;
}

.dark-theme #noteTitle {
    color: var(--text-primary-dark);
}

.note-meta {
    font-size: var(--font-size-xs);
    color: var(--text-secondary-light);
    margin-top: var(--spacing-xs);
}

.dark-theme .note-meta {
    color: var(--text-secondary-dark);
}

.editor-body {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    overflow: auto;
}

#noteContent {
    width: 100%;
    height: 100%;
    border: none;
    background: transparent;
    color: var(--text-primary-light);
    font-size: var(--font-size-md);
    line-height: 1.6;
    resize: none;
    outline: none;
}

.dark-theme #noteContent {
    color: var(--text-primary-dark);
}

.editor-actions {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    border-top: 1px solid var(--divider-light);
}

.dark-theme .editor-actions {
    border-top-color: var(--divider-dark);
}

/* Button Styles */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    border: none;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    font-size: var(--font-size-md);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.3);
}

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

.btn-primary:hover:not(:disabled) {
    background-color: #1976D2;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

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

.dark-theme .btn-secondary {
    color: var(--text-primary-dark);
    border-color: var(--border-dark);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(0, 0, 0, 0.05);
}

.dark-theme .btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-danger {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

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

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Settings Panel Styles */
.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 350px;
    height: 100%;
    background-color: var(--surface-light);
    box-shadow: -2px 0 10px var(--shadow-light);
    z-index: 1000;
    transform: translateX(0);
    transition: transform var(--transition-normal), background-color var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.settings-panel.hidden {
    transform: translateX(100%);
}

.dark-theme .settings-panel {
    background-color: var(--surface-dark);
    box-shadow: -2px 0 10px var(--shadow-dark);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--divider-light);
}

.dark-theme .settings-header {
    border-bottom-color: var(--divider-dark);
}

.settings-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) var(--spacing-lg);
}

.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary-light);
}

.dark-theme .settings-section h3 {
    color: var(--text-primary-dark);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--divider-light);
}

.dark-theme .setting-item {
    border-bottom-color: var(--divider-dark);
}

.setting-item:last-child {
    border-bottom: none;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 60px;
    height: 30px;
}

.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-1);
    border-radius: 34px;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-sm);
}

.toggle-label:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    border-radius: 50%;
    transition: var(--transition-normal);
    z-index: 2;
}

.toggle-input:checked + .toggle-label:before {
    transform: translateX(30px);
}

.toggle-icon {
    color: white;
    font-size: var(--font-size-xs);
    z-index: 1;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Footer Styles */
.app-footer {
    text-align: center;
    padding: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--text-secondary-light);
    border-top: 1px solid var(--divider-light);
    background-color: var(--surface-light);
}

.dark-theme .app-footer {
    color: var(--text-secondary-dark);
    border-top-color: var(--divider-dark);
    background-color: var(--surface-dark);
}

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

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

/* Responsive Styles */
@media (max-width: 768px) {
    .app-main {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-light);
        max-height: 40vh;
    }
    
    .dark-theme .sidebar {
        border-bottom-color: var(--border-dark);
    }
    
    .settings-panel {
        width: 100%;
    }
    
    .editor-actions {
        flex-wrap: wrap;
    }
    
    .btn {
        flex: 1;
        min-width: 20px;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: var(--font-size-lg);
    }
    
    .editor-actions {
        gap: var(--spacing-sm);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
}

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

.fade-in {
    animation: fadeIn var(--transition-normal);
}

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

.text-overflow {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Y2K Aesthetic Elements */
.y2k-bubble {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(4px);
    border-radius: var(--border-radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: var(--bubble-shadow);
}

.dark-theme .y2k-bubble {
    background: rgba(30, 30, 30, 0.25);
    border: 1px solid rgba(50, 50, 50, 0.18);
}