/* ===== CSS VARIABLES ===== */
:root {
    /* Primary Colors */
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Priority Colors */
    --priority-high: #ef4444;
    --priority-medium: #f59e0b;
    --priority-low: #10b981;

    /* Category Colors */
    --category-work: #3b82f6;
    --category-personal: #8b5cf6;
    --category-shopping: #f59e0b;
    --category-health: #10b981;

    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: all 0.15s ease;
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;

    /* Sidebar */
    --sidebar-width: 280px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== APP CONTAINER ===== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 3px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 20px;
    animation: spin 8s linear infinite;
}

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

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

/* Section Titles */
.section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--gray-400);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

/* Statistics Cards */
.statistics {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--gray-50);
    border-radius: var(--radius);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateX(4px);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-total .stat-icon {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: var(--info);
}

.stat-completed .stat-icon {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: var(--success);
}

.stat-pending .stat-icon {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: var(--warning);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-800);
    line-height: 1.2;
}

.stat-label {
    font-size: 12px;
    color: var(--gray-500);
}

/* Filter Buttons */
.filter-list,
.priority-list,
.category-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.filter-btn,
.priority-btn,
.category-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.filter-btn:hover,
.priority-btn:hover,
.category-btn:hover {
    background: var(--gray-100);
}

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

.filter-btn.active i {
    color: var(--white);
}

.filter-btn i {
    width: 20px;
    text-align: center;
    font-size: 14px;
    color: var(--gray-400);
}

.priority-btn.active,
.category-btn.active {
    background: var(--gray-100);
    font-weight: 600;
}

/* Priority & Category Dots */
.priority-dot,
.category-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.priority-dot.high { background: var(--priority-high); }
.priority-dot.medium { background: var(--priority-medium); }
.priority-dot.low { background: var(--priority-low); }

.category-dot.work { background: var(--category-work); }
.category-dot.personal { background: var(--category-personal); }
.category-dot.shopping { background: var(--category-shopping); }
.category-dot.health { background: var(--category-health); }

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px 32px;
    min-height: 100vh;
    background: var(--gray-50);
}

/* Main Header */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.view-toggle {
    display: flex;
    background: var(--white);
    border-radius: var(--radius);
    padding: 4px;
    box-shadow: var(--shadow-sm);
}

.view-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
}

.view-btn:hover {
    color: var(--gray-700);
}

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

.settings-btn {
    width: 44px;
    height: 44px;
    background: var(--white);
    border: none;
    border-radius: var(--radius);
    color: var(--gray-500);
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.settings-btn:hover {
    background: var(--gray-100);
    color: var(--gray-700);
    transform: rotate(45deg);
}

/* Search & Add Bar */
.search-add-bar {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.search-wrapper {
    flex: 1;
    position: relative;
}

.search-wrapper i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 16px;
}

#searchInput {
    width: 100%;
    padding: 14px 18px 14px 50px;
    background: var(--white);
    border: 2px solid transparent;
    border-radius: var(--radius);
    font-size: 15px;
    color: var(--gray-800);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

#searchInput::placeholder {
    color: var(--gray-400);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.add-task-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--success);
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    white-space: nowrap;
}

.add-task-btn:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.add-task-btn:active {
    transform: translateY(0);
}

/* ===== TASK LIST ===== */
.task-view {
    animation: fadeIn 0.3s ease;
}

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

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

.task-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Task Item */
.task-item {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    animation: slideIn 0.3s ease;
    border-left: 4px solid transparent;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.task-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.task-item.priority-high { border-left-color: var(--priority-high); }
.task-item.priority-medium { border-left-color: var(--priority-medium); }
.task-item.priority-low { border-left-color: var(--priority-low); }

.task-item.completed {
    opacity: 0.7;
}

.task-item.completed .task-title {
    text-decoration: line-through;
    color: var(--gray-400);
}

.task-item.removing {
    animation: slideOut 0.3s ease forwards;
}

@keyframes slideOut {
    to { opacity: 0; transform: translateX(30px); height: 0; padding: 0; margin: 0; }
}

/* Task Header */
.task-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 12px;
}

.task-checkbox-wrapper {
    position: relative;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.task-checkbox {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 1;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.checkbox-custom i {
    font-size: 12px;
    color: var(--white);
    opacity: 0;
    transform: scale(0);
    transition: var(--transition);
}

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

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

.task-checkbox:checked + .checkbox-custom i {
    opacity: 1;
    transform: scale(1);
}

.task-content {
    flex: 1;
    min-width: 0;
}

.task-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
    word-break: break-word;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.task-priority {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    text-transform: capitalize;
}

.task-priority.high {
    background: #fef2f2;
    color: var(--priority-high);
}

.task-priority.medium {
    background: #fffbeb;
    color: var(--priority-medium);
}

.task-priority.low {
    background: #ecfdf5;
    color: var(--priority-low);
}

.task-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-500);
}

.task-category i {
    font-size: 12px;
}

.task-category.work { color: var(--category-work); }
.task-category.personal { color: var(--category-personal); }
.task-category.shopping { color: var(--category-shopping); }
.task-category.health { color: var(--category-health); }

.task-due {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-500);
}

.task-due i {
    font-size: 12px;
}

.task-due.overdue {
    color: var(--danger);
}

.task-progress {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-500);
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: var(--transition);
}

.task-item:hover .task-actions {
    opacity: 1;
}

.task-action-btn {
    width: 36px;
    height: 36px;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-action-btn:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.task-action-btn.delete:hover {
    background: var(--danger);
    color: var(--white);
}

/* Subtasks */
.subtasks-container {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    color: var(--gray-600);
    font-size: 14px;
}

.subtask-item.completed {
    color: var(--gray-400);
    text-decoration: line-through;
}

.subtask-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 80px 40px;
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    width: 100px;
    height: 100px;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.empty-icon i {
    font-size: 40px;
    color: var(--gray-400);
}

.empty-state h3 {
    font-size: 20px;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--gray-500);
    font-size: 15px;
}

/* ===== CALENDAR VIEW ===== */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.calendar-nav {
    width: 40px;
    height: 40px;
    background: var(--white);
    border: none;
    border-radius: var(--radius);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-nav:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.calendar-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-800);
    min-width: 180px;
    text-align: center;
}

.calendar-grid {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.calendar-weekdays span {
    padding: 16px;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.calendar-day {
    min-height: 100px;
    padding: 12px;
    border-right: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
    transition: var(--transition);
}

.calendar-day:nth-child(7n) {
    border-right: none;
}

.calendar-day:hover {
    background: var(--gray-50);
}

.calendar-day.other-month {
    background: var(--gray-50);
}

.calendar-day.other-month .day-number {
    color: var(--gray-300);
}

.calendar-day.today {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
}

.calendar-day.today .day-number {
    background: var(--primary);
    color: var(--white);
}

.day-number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    border-radius: 50%;
    margin-bottom: 8px;
}

.day-tasks {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.day-task {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: var(--transition);
}

.day-task:hover {
    transform: translateX(2px);
}

.day-task.priority-high {
    background: #fef2f2;
    color: var(--priority-high);
    border-left: 2px solid var(--priority-high);
}

.day-task.priority-medium {
    background: #fffbeb;
    color: var(--priority-medium);
    border-left: 2px solid var(--priority-medium);
}

.day-task.priority-low {
    background: #ecfdf5;
    color: var(--priority-low);
    border-left: 2px solid var(--priority-low);
}

.day-task-count {
    font-size: 11px;
    color: var(--gray-500);
    margin-top: 4px;
}

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal {
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: scale(0.9) translateY(20px);
    transition: var(--transition-slow);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 28px;
    border-bottom: 1px solid var(--gray-100);
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-800);
}

.modal-close {
    width: 36px;
    height: 36px;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius);
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.modal-body {
    padding: 28px;
    overflow-y: auto;
    max-height: calc(90vh - 180px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 20px 28px;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-100);
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

#taskTitle,
#taskDescription,
#taskDueDate,
#taskPriority,
#taskCategory {
    width: 100%;
    padding: 12px 16px;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 15px;
    color: var(--gray-800);
    transition: var(--transition);
    font-family: inherit;
}

#taskTitle:focus,
#taskDescription:focus,
#taskDueDate:focus,
#taskPriority:focus,
#taskCategory:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

#taskDescription {
    resize: vertical;
    min-height: 80px;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 18px;
    padding-right: 40px;
    cursor: pointer;
}

/* Subtasks in Modal */
.subtasks-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.subtask-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.subtask-input-wrapper input[type="text"] {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-700);
}

.subtask-input-wrapper input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
}

.remove-subtask-btn {
    width: 32px;
    height: 32px;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--gray-400);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.add-subtask-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
}

.add-subtask-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background: #059669;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    top: 24px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--success);
    color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    font-size: 15px;
    font-weight: 500;
    z-index: 2000;
    transform: translateX(calc(100% + 24px));
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

.toast i {
    font-size: 20px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }

    .main-content {
        margin-left: 240px;
        padding: 20px 24px;
    }

    :root {
        --sidebar-width: 240px;
    }
}

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

    .sidebar {
        position: fixed;
        left: -100%;
        width: 280px;
        transition: var(--transition-slow);
        z-index: 200;
        box-shadow: var(--shadow-xl);
    }

    .sidebar.open {
        left: 0;
    }

    .main-content {
        margin-left: 0;
        padding: 20px 16px;
    }

    .main-header {
        flex-wrap: wrap;
        gap: 12px;
    }

    .view-toggle {
        order: 2;
        width: 100%;
    }

    .view-btn {
        flex: 1;
        justify-content: center;
    }

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

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

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

    .calendar-day {
        min-height: 80px;
        padding: 8px;
    }

    .day-number {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }

    .task-actions {
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .modal {
        margin: 16px;
        max-height: calc(100vh - 32px);
    }

    .modal-body {
        padding: 20px;
    }

    .calendar-weekdays span {
        padding: 12px 4px;
        font-size: 11px;
    }

    .day-task {
        display: none;
    }

    .day-task-count {
        display: block;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ===== SELECTION ===== */
::selection {
    background: var(--primary-light);
    color: var(--white);
}

/* Mobile Menu Toggle Button (added via JS) */
.mobile-menu-btn {
    display: none;
    position: fixed;
    bottom: 24px;
    left: 24px;
    width: 56px;
    height: 56px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 24px;
    cursor: pointer;
    z-index: 150;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
}

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