/* CSS Variables for Theme Support */
:root {
    /* Light Theme */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --sidebar-width: 280px;
    --header-height: 70px;
    --border-radius: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --border-hover: #475569;
}

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

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

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

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

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

/* User Section */
.user-section {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.username {
    font-weight: 500;
    font-size: 0.9rem;
}

.user-status {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

/* Navigation */
.navigation {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: 2rem;
}

.nav-section h3 {
    padding: 0 1.5rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.nav-list {
    list-style: none;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

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

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

.nav-item i {
    width: 20px;
    text-align: center;
}

.nav-item span:first-of-type {
    flex: 1;
    font-weight: 500;
}

.task-count {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

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

/* Sidebar Footer */
.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: var(--transition);
}

/* Header */
.header {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-container {
    position: relative;
}

.search-container input {
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    width: 300px;
    transition: var(--transition);
}

.search-container input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-container i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Filters */
.filters {
    padding: 1rem 2rem;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-group select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Content Area */
.content-area {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.view-container {
    animation: fadeIn 0.3s ease-in-out;
}

.view-container.hidden {
    display: none;
}

/* Tasks Container */
.tasks-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Task Item */
.task-item {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.task-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.task-item.completed {
    opacity: 0.7;
    background-color: var(--bg-tertiary);
}

.task-item.completed .task-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

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

.task-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.task-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.task-priority {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.task-priority.high {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.task-priority.medium {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.task-priority.low {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.task-category {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.task-due-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.task-due-date.overdue {
    color: var(--danger-color);
    font-weight: 600;
}

.task-due-date.due-soon {
    color: var(--warning-color);
    font-weight: 600;
}

.task-status {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.task-status.pending {
    background-color: rgba(107, 114, 128, 0.1);
    color: var(--secondary-color);
}

.task-status.in-progress {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--info-color);
}

.task-status.completed {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.task-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    background-color: var(--bg-primary);
}

.task-checkbox.checked {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.task-checkbox:hover {
    border-color: var(--primary-color);
}

.task-attachments {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.attachment-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.attachment-item i {
    color: var(--primary-color);
}

.countdown-timer {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--danger-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    animation: pulse 2s infinite;
}

/* Calendar Styles */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.calendar-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.calendar-day {
    background-color: var(--bg-primary);
    min-height: 120px;
    padding: 0.75rem;
    position: relative;
    transition: var(--transition);
}

.calendar-day:hover {
    background-color: var(--bg-tertiary);
}

.calendar-day.other-month {
    background-color: var(--bg-secondary);
    color: var(--text-muted);
}

.calendar-day.today {
    background-color: rgba(59, 130, 246, 0.1);
    border: 2px solid var(--primary-color);
}

.calendar-day-header {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.calendar-day-tasks {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.calendar-task {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.calendar-task:hover {
    background-color: var(--primary-hover);
}

.calendar-task.high {
    background-color: var(--danger-color);
}

.calendar-task.medium {
    background-color: var(--warning-color);
}

.calendar-task.low {
    background-color: var(--success-color);
}

/* Timeline Styles */
.timeline-container {
    position: relative;
}

.timeline-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 2rem;
    bottom: -2rem;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item:last-child::before {
    display: none;
}

.timeline-marker {
    width: 2rem;
    height: 2rem;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

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

.timeline-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: scale(1);
}

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

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

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.modal-body {
    padding: 1.5rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

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

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.file-preview {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.file-preview-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Auth Forms */
.auth-tabs {
    display: flex;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    animation: fadeIn 0.3s ease-in-out;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* Notification Styles */
.notification-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.notification {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    animation: slideIn 0.3s ease-out;
}

.notification.success {
    border-left: 4px solid var(--success-color);
}

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

.notification.error {
    border-left: 4px solid var(--danger-color);
}

.notification.info {
    border-left: 4px solid var(--info-color);
}

.notification-icon {
    font-size: 1.2rem;
}

.notification.success .notification-icon {
    color: var(--success-color);
}

.notification.warning .notification-icon {
    color: var(--warning-color);
}

.notification.error .notification-icon {
    color: var(--danger-color);
}

.notification.info .notification-icon {
    color: var(--info-color);
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

.notification-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

/* Countdown Overlay */
.countdown-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.countdown-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
}

.countdown-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--danger-color);
}

.countdown-timer {
    font-size: 3rem;
    font-weight: 700;
    color: var(--danger-color);
    margin-bottom: 1rem;
    font-family: 'Courier New', monospace;
}

.countdown-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

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

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

.text-right {
    text-align: right;
}

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

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

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

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

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

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .search-container input {
        width: 200px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0 1rem;
    }
    
    .content-area {
        padding: 1rem;
    }
    
    .filters {
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .filter-group select {
        width: 100%;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .task-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .task-actions {
        flex-wrap: wrap;
    }
    
    .search-container input {
        width: 150px;
    }
    
    .notification-container {
        top: 1rem;
        right: 1rem;
        left: 1rem;
    }
    
    .notification {
        min-width: auto;
    }
    
    .calendar-grid {
        font-size: 0.8rem;
    }
    
    .calendar-day {
        min-height: 80px;
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 100%;
    }
    
    .header-right {
        gap: 0.5rem;
    }
    
    .search-container {
        display: none;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .countdown-content {
        padding: 2rem 1rem;
    }
    
    .countdown-timer {
        font-size: 2rem;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .header,
    .filters,
    .modal,
    .notification-container,
    .countdown-overlay {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .task-item {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}