/* ============================================
   Helium Desktop Assistant - Styles v2.0
   Fully Responsive with Mobile-First Design
   ============================================ */

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Backgrounds */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252542;
    --bg-card: #1e1e3f;
    --bg-hover: #2d2d5a;
    
    /* Text */
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    
    /* Borders */
    --border-color: #2d2d5a;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --header-height: 70px;
    --mobile-header-height: 60px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --bg-card: #ffffff;
    --bg-hover: #f1f3f5;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    touch-action: manipulation;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Mobile Header (visible on small screens)
   ============================================ */

.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
}

.menu-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.1rem;
}

.mobile-logo i {
    color: var(--primary);
    font-size: 1.25rem;
}

.voice-btn-mobile {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

/* ============================================
   Layout
   ============================================ */

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ============================================
   Sidebar
   ============================================ */

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    transition: transform var(--transition-normal);
    z-index: 99;
}

.sidebar-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.sidebar-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    white-space: nowrap;
}

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

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-item i {
    width: 24px;
    text-align: center;
    font-size: 1.1rem;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.system-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.sync-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.sync-status i {
    font-size: 0.8rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--secondary);
    box-shadow: 0 0 8px var(--secondary);
}

.status-dot.online {
    animation: pulse 2s infinite;
}

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

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 98;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ============================================
   Main Content
   ============================================ */

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

/* ============================================
   Header
   ============================================ */

.header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-xl);
    gap: var(--spacing-lg);
}

.search-bar {
    flex: 1;
    max-width: 600px;
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-sm);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

.search-bar:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-bar i {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.voice-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.voice-btn.recording {
    background: var(--danger);
    color: white;
    animation: pulse 1s infinite;
}

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

.action-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* ============================================
   Sections
   ============================================ */

.section {
    display: none;
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    -webkit-overflow-scrolling: touch;
}

.section.active {
    display: block;
}

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

.section-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.greeting {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ============================================
   Dashboard Grid
   ============================================ */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.widget {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.widget:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.widget-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.widget-header i {
    color: var(--primary);
}

.widget-refresh {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.widget-refresh:hover {
    color: var(--primary);
    background: var(--bg-tertiary);
}

/* Clock Widget */
.clock-display {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.time {
    font-size: 3.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.date {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* Weather Widget */
.weather-display {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.weather-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.weather-icon {
    font-size: 3rem;
    color: var(--warning);
}

.temperature {
    font-size: 2.5rem;
    font-weight: 700;
}

.weather-details {
    text-align: right;
    color: var(--text-secondary);
}

.weather-details span {
    display: block;
}

.weather-location {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Quick Actions */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.action-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    font-size: 0.85rem;
    border: none;
}

.action-card:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.action-card i {
    font-size: 1.5rem;
}

/* System Widget */
.system-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
}

.stat i {
    font-size: 1.25rem;
    color: var(--primary);
    width: 24px;
}

.stat-info {
    flex: 1;
    display: flex;
    justify-content: space-between;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-value {
    font-weight: 600;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 3px;
    transition: width var(--transition-slow);
}

/* Recent Files */
.files-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-item:hover {
    background: var(--bg-hover);
}

.file-item i {
    color: var(--primary);
    width: 20px;
}

.file-time {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Chat Widget */
.chat-widget {
    grid-column: span 2;
}

.chat-container {
    height: 250px;
    overflow-y: auto;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.chat-message {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.chat-message.assistant {
    flex-direction: row;
}

.chat-message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.chat-message.user .message-avatar {
    background: var(--secondary);
}

.message-content {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    max-width: 80%;
}

.chat-message.user .message-content {
    background: var(--primary);
    color: white;
}

.chat-input {
    display: flex;
    gap: var(--spacing-sm);
}

.chat-input input {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    outline: none;
}

.chat-input input:focus {
    border-color: var(--primary);
}

.send-btn {
    width: 44px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.chat-quick-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.chat-quick-actions button {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-quick-actions button:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.chat-speech-toggle {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
}

.chat-speech-toggle:hover {
    color: var(--primary);
}

/* ============================================
   Apps Section
   ============================================ */

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-lg);
}

.app-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.app-item:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.app-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.app-name {
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
}

/* ============================================
   Tools Section
   ============================================ */

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.tool-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.tool-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
    margin: 0 auto var(--spacing-lg);
}

.tool-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   Files Section
   ============================================ */

.files-container {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.files-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

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

.files-view-toggle {
    display: flex;
    gap: var(--spacing-xs);
}

.view-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.files-browser {
    padding: var(--spacing-lg);
    display: grid;
    gap: var(--spacing-md);
}

.files-browser.grid-view {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.files-browser.list-view {
    grid-template-columns: 1fr;
}

.file-browser-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.files-browser.list-view .file-browser-item {
    flex-direction: row;
    text-align: left;
    padding: var(--spacing-md);
}

.file-browser-item:hover {
    background: var(--bg-hover);
}

.file-browser-item i {
    font-size: 2.5rem;
    color: var(--primary);
}

.file-browser-item.folder i {
    color: var(--warning);
}

/* ============================================
   Notes Section
   ============================================ */

.notes-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
}

.note-editor {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.note-title {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    outline: none;
}

.note-title:focus {
    border-color: var(--primary);
}

.note-toolbar {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    flex-wrap: wrap;
}

.note-toolbar button {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.note-toolbar button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.note-content {
    flex: 1;
    min-height: 300px;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    font-family: inherit;
}

.note-content:focus {
    border-color: var(--primary);
}

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

.notes-sidebar {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
}

.notes-sidebar h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.notes-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 500px;
    overflow-y: auto;
}

.saved-note {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.saved-note:hover {
    background: var(--bg-hover);
}

.saved-note h4 {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
}

.saved-note p {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================
   Calculator Section
   ============================================ */

.calculator-container {
    display: flex;
    justify-content: center;
    padding: var(--spacing-xl);
}

.calculator {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    width: 100%;
    max-width: 400px;
}

.calc-display {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: right;
}

.calc-history {
    font-size: 0.9rem;
    color: var(--text-muted);
    min-height: 24px;
    margin-bottom: var(--spacing-xs);
}

.calc-input {
    font-size: 2.5rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    overflow: hidden;
    text-overflow: ellipsis;
}

.calc-scientific {
    display: none;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.calc-scientific.active {
    display: grid;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.calc-btn {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.calc-btn.function {
    background: var(--bg-secondary);
    color: var(--danger);
}

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

.calc-btn.equals {
    background: var(--secondary);
    color: white;
}

/* ============================================
   Converter Section
   ============================================ */

.converter-container {
    max-width: 600px;
    margin: 0 auto;
}

.converter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.conv-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.converter-panel {
    display: none;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
}

.converter-panel.active {
    display: block;
}

.converter-inputs {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.conv-group {
    flex: 1;
    min-width: 200px;
}

.conv-group input,
.conv-group select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.conv-group input:focus,
.conv-group select:focus {
    border-color: var(--primary);
    outline: none;
}

.conv-equals {
    color: var(--primary);
    font-size: 1.5rem;
}

.currency-note {
    margin-top: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
}

/* ============================================
   Timer Section
   ============================================ */

.timer-container {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
}

.timer-modes {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
}

.timer-mode {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.timer-mode.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.timer-display {
    margin-bottom: var(--spacing-xl);
}

.timer-circle {
    position: relative;
    width: 250px;
    height: 250px;
    margin: 0 auto;
}

.timer-circle svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.timer-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 4;
}

.timer-progress {
    fill: none;
    stroke: var(--primary);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.timer-time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.timer-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.timer-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.timer-btn:hover {
    transform: translateY(-2px);
}

.timer-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   Sketch Section
   ============================================ */

.sketch-container {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.sketch-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    align-items: center;
}

.tool-group {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.sketch-tool {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sketch-tool.active,
.sketch-tool:hover {
    background: var(--primary);
    color: white;
}

#sketch-color {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
}

#sketch-size {
    width: 100px;
}

.sketch-canvas-container {
    position: relative;
    height: 500px;
    background: white;
}

#sketch-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* ============================================
   Music Section
   ============================================ */

.music-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
}

.music-player {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
    text-align: center;
}

.album-art {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-xl);
    position: relative;
}

.vinyl-record {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(45deg, #1a1a1a, #333, #1a1a1a);
    position: relative;
    animation: none;
}

.vinyl-record.playing {
    animation: spin 2s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.vinyl-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary);
}

.music-info {
    margin-bottom: var(--spacing-lg);
}

.music-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.music-info p {
    color: var(--text-secondary);
}

.music-progress {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.time-display {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.music-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.music-controls button {
    width: 48px;
    height: 48px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.music-controls button.play-btn {
    width: 64px;
    height: 64px;
    background: var(--primary);
    font-size: 1.5rem;
}

.music-controls button:hover {
    transform: scale(1.1);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    justify-content: center;
}

.volume-control input {
    width: 150px;
}

.playlist {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
}

.playlist h3 {
    margin-bottom: var(--spacing-md);
}

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

.playlist-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.playlist-item:hover,
.playlist-item.active {
    background: var(--primary);
}

.playlist-item i {
    color: var(--text-muted);
}

.playlist-item.active i {
    color: white;
}

/* ============================================
   Password Section
   ============================================ */

.password-container {
    max-width: 500px;
    margin: 0 auto;
}

.password-display {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.password-display input {
    flex: 1;
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1.25rem;
    font-family: monospace;
    text-align: center;
}

.password-display button {
    width: 56px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.25rem;
}

.password-strength {
    margin-bottom: var(--spacing-lg);
}

.strength-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.strength-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: 60%;
    background: var(--warning);
    border-radius: 3px;
    transition: all var(--transition-fast);
}

.password-options {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.option {
    margin-bottom: var(--spacing-md);
}

.option label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.option input[type="range"] {
    width: 100%;
    margin-top: var(--spacing-sm);
}

.option.checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

/* ============================================
   QR Code Section
   ============================================ */

.qrcode-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.qrcode-input {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
}

.qrcode-input textarea {
    width: 100%;
    height: 150px;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    resize: vertical;
    margin-bottom: var(--spacing-lg);
}

.qr-options {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.qr-options .option {
    flex: 1;
}

.qr-options select,
.qr-options input {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    margin-top: var(--spacing-xs);
}

.qrcode-output {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
}

#qr-result {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.qr-placeholder {
    color: var(--text-muted);
    text-align: center;
}

/* ============================================
   World Clock Section
   ============================================ */

.worldclock-container {
    max-width: 800px;
    margin: 0 auto;
}

.clock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.world-clock-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    text-align: center;
    position: relative;
}

.world-clock-card .delete-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
}

.world-clock-card:hover .delete-btn {
    opacity: 1;
}

.world-clock-card .delete-btn:hover {
    background: var(--danger);
    color: white;
}

.clock-city {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.clock-time {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.clock-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.clock-offset {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    overflow: hidden;
}

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

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.city-list {
    max-height: 300px;
    overflow-y: auto;
}

.city-item {
    padding: var(--spacing-md);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.city-item:hover {
    background: var(--bg-hover);
}

/* ============================================
   Settings Section
   ============================================ */

.settings-container {
    max-width: 800px;
}

.settings-group {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.settings-group h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    color: var(--text-primary);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.setting-item label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.setting-item select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    outline: none;
}

.color-picker {
    display: flex;
    gap: var(--spacing-sm);
}

.color-option {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-option:hover,
.color-option.active {
    border-color: var(--text-primary);
    transform: scale(1.1);
}

/* Toggle Switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    border-radius: 24px;
    transition: all var(--transition-fast);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.setting-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.btn-danger {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--danger);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Shortcuts */
.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
}

kbd {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: monospace;
    font-size: 0.85rem;
}

.about-info {
    text-align: center;
    color: var(--text-secondary);
}

.about-info p {
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Voice Overlay
   ============================================ */

.voice-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.voice-overlay.active {
    display: flex;
}

.voice-container {
    text-align: center;
    color: white;
    padding: var(--spacing-xl);
}

.voice-animation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: var(--spacing-xl);
}

.voice-wave {
    width: 6px;
    height: 40px;
    background: var(--primary);
    border-radius: 3px;
    animation: wave 1s ease-in-out infinite;
}

.voice-wave:nth-child(2) { animation-delay: 0.1s; }
.voice-wave:nth-child(3) { animation-delay: 0.2s; }
.voice-wave:nth-child(4) { animation-delay: 0.3s; }
.voice-wave:nth-child(5) { animation-delay: 0.4s; }

@keyframes wave {
    0%, 100% { transform: scaleY(0.5); }
    50% { transform: scaleY(1.5); }
}

.voice-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.voice-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.voice-close {
    position: absolute;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.voice-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 1000;
    max-width: 400px;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 300px;
}

.toast.success { border-left: 4px solid var(--secondary); }
.toast.error { border-left: 4px solid var(--danger); }
.toast.warning { border-left: 4px solid var(--warning); }
.toast.info { border-left: 4px solid var(--info); }

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    font-size: 1.25rem;
}

.toast.success .toast-icon { color: var(--secondary); }
.toast.error .toast-icon { color: var(--danger); }
.toast.warning .toast-icon { color: var(--warning); }
.toast.info .toast-icon { color: var(--info); }

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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

/* ============================================
   Responsive Design - Mobile First
   ============================================ */

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-widget {
        grid-column: span 1;
    }
    
    .notes-container {
        grid-template-columns: 1fr;
    }
    
    .music-container {
        grid-template-columns: 1fr;
    }
    
    .qrcode-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 24px;
        --spacing-lg: 16px;
    }
    
    .mobile-header {
        display: flex;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-header {
        display: flex;
    }
    
    .main-content {
        margin-top: var(--mobile-header-height);
    }
    
    .header {
        display: none;
    }
    
    .section {
        padding: var(--spacing-md);
    }
    
    .time {
        font-size: 2.5rem;
    }
    
    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .apps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
    
    .app-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .files-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .files-actions {
        justify-content: space-between;
    }
    
    .converter-inputs {
        flex-direction: column;
    }
    
    .conv-equals {
        transform: rotate(90deg);
    }
    
    .timer-circle {
        width: 200px;
        height: 200px;
    }
    
    .timer-time {
        font-size: 2.5rem;
    }
    
    .sketch-canvas-container {
        height: 350px;
    }
    
    .clock-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
    
    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .action-card {
        padding: var(--spacing-md);
    }
    
    .action-card i {
        font-size: 1.25rem;
    }
    
    .apps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .app-item {
        padding: var(--spacing-md);
    }
    
    .app-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .app-name {
        font-size: 0.75rem;
    }
    
    .clock-grid {
        grid-template-columns: 1fr;
    }
    
    .calc-input {
        font-size: 2rem;
    }
    
    .tool-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }
}

/* Touch device optimizations */
@media (hover: none) {
    .nav-item:hover,
    .action-card:hover,
    .app-item:hover,
    .tool-card:hover {
        transform: none;
    }
    
    .widget:hover {
        border-color: var(--border-color);
    }
}

/* Large screens */
@media (min-width: 1400px) {
    .dashboard-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .chat-widget {
        grid-column: span 2;
    }
}