/* 
 * SimplePlan - Main Stylesheet
 * A comprehensive digital planner with customizable views and themes
 */

/* ========= Base Styles & Reset ========= */
:root {
    /* Color Palette */
    --color-pink: #F6DFEB;
    --color-purple: #E4C1F9;
    --color-green: #D0F4DE;
    --color-yellow: #FCF6BD;
    --color-coral: #FFB7C5;
    
    /* Theme: Light (Default) */
    --color-primary: var(--color-purple);
    --color-secondary: var(--color-pink);
    --color-accent: var(--color-coral);
    --color-background: #ffffff;
    --color-surface: #f8f8f8;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    /* Font Sizes */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Theme: Dark */
.theme-dark {
    --color-primary: #9D84B7;
    --color-secondary: #7E6B8F;
    --color-accent: #E98A15;
    --color-background: #2D2D2D;
    --color-surface: #3D3D3D;
    --color-text: #F0F0F0;
    --color-text-light: #BBBBBB;
    --color-border: #555555;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* Theme: Pastel */
.theme-pastel {
    --color-primary: var(--color-pink);
    --color-secondary: var(--color-green);
    --color-accent: var(--color-yellow);
    --color-background: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #707070;
    --color-text-light: #A0A0A0;
    --color-border: #E6E6E6;
    --color-shadow: rgba(0, 0, 0, 0.05);
}

/* Theme: Vibrant */
.theme-vibrant {
    --color-primary: #7B2CBF;
    --color-secondary: #3A0CA3;
    --color-accent: #F72585;
    --color-background: #FFFFFF;
    --color-surface: #F8F9FA;
    --color-text: #212529;
    --color-text-light: #6C757D;
    --color-border: #DEE2E6;
    --color-shadow: rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent);
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: var(--font-size-md);
    color: var(--color-text);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(228, 193, 249, 0.3);
}

/* ========= Layout & Container Styles ========= */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1440px;
    margin: 0 auto;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 4px var(--color-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-content {
    flex: 1;
    padding: var(--spacing-md);
    overflow-x: hidden;
}

.app-footer {
    padding: var(--spacing-md);
    text-align: center;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* ========= Header Components ========= */
.logo-container {
    display: flex;
    flex-direction: column;
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
}

.app-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-toggle {
    display: none;
    font-size: var(--font-size-lg);
    color: var(--color-text);
    margin-right: var(--spacing-md);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

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

/* ========= Button Styles ========= */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-primary);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.btn-danger {
    background-color: #ff4d4d;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: background-color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-danger:hover {
    background-color: #ff3333;
}

.btn-icon {
    color: var(--color-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.btn-text {
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast);
}

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

/* ========= Screen Styles ========= */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

.screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

/* ========= Dashboard Styles ========= */
.dashboard-header {
    margin-bottom: var(--spacing-lg);
}

.current-date {
    color: var(--color-text-light);
    font-size: var(--font-size-md);
}

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

.dashboard-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px var(--color-shadow);
    display: flex;
    flex-direction: column;
}

.dashboard-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    font-size: var(--font-size-lg);
}

.card-actions {
    margin-top: auto;
    padding-top: var(--spacing-md);
    display: flex;
    justify-content: flex-end;
}

/* Mini Calendar */
.mini-calendar-container {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    margin-bottom: var(--spacing-md);
}

.mini-calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.mini-calendar-day:hover {
    background-color: var(--color-secondary);
}

.mini-calendar-day.current {
    background-color: var(--color-primary);
    color: white;
    font-weight: bold;
}

.mini-calendar-day.has-tasks::after {
    content: '';
    position: absolute;
    bottom: 2px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

/* Task List */
.task-list {
    margin-bottom: var(--spacing-md);
}

.task-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    background-color: var(--color-background);
    border-left: 3px solid var(--color-primary);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.task-item:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 4px var(--color-shadow);
}

.task-checkbox {
    margin-right: var(--spacing-sm);
}

.task-content {
    flex: 1;
}

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

.task-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.task-category {
    font-size: var(--font-size-xs);
    padding: 2px 6px;
    border-radius: var(--border-radius-sm);
    background-color: var(--color-secondary);
    color: var(--color-text);
    margin-left: var(--spacing-sm);
}

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

/* Quick Stats */
.stats-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

/* Quick Notes */
.quick-note-container {
    display: flex;
    flex-direction: column;
}

#quickNote {
    width: 100%;
    height: 100px;
    resize: none;
    margin-bottom: var(--spacing-sm);
}

.quick-note-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* ========= Monthly View Styles ========= */
.date-navigation {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-container {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.calendar-container {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 6px var(--color-shadow);
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) 0;
}

.weekday {
    text-align: center;
    font-weight: 600;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: minmax(100px, auto);
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
}

.calendar-day {
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    min-height: 100px;
    position: relative;
}

.calendar-day.other-month {
    background-color: var(--color-background);
    opacity: 0.5;
}

.calendar-day.today {
    background-color: rgba(228, 193, 249, 0.2);
}

.day-number {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.day-tasks {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.day-task-indicator {
    padding: 2px 4px;
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.day-more-tasks {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    text-align: center;
    margin-top: 2px;
    cursor: pointer;
}

/* ========= Weekly View Styles ========= */
.layout-toggle {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.layout-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--color-surface);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.week-layout {
    display: none;
}

.week-layout.active {
    display: block;
}

/* Grid Layout */
.week-header {
    display: grid;
    grid-template-columns: 60px repeat(7, 1fr);
    background-color: var(--color-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-sm) 0;
}

.time-column, .day-column {
    padding: var(--spacing-sm);
    font-weight: 600;
}

.week-grid {
    display: grid;
    grid-template-columns: 60px repeat(7, 1fr);
    border-left: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.time-slot {
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xs);
    min-height: 60px;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.day-slot {
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xs);
    min-height: 60px;
    position: relative;
}

.day-slot.current-time {
    background-color: rgba(228, 193, 249, 0.1);
}

.time-indicator {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-accent);
    z-index: 1;
}

.week-task {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    margin-bottom: 2px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: transform var(--transition-fast);
}

.week-task:hover {
    transform: translateY(-2px);
}

/* Kanban Layout */
.kanban-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.kanban-column {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: 0 2px 4px var(--color-shadow);
}

.kanban-column-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.kanban-tasks {
    min-height: 200px;
}

.kanban-task {
    background-color: var(--color-background);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    box-shadow: 0 1px 3px var(--color-shadow);
    cursor: move;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.kanban-task:hover {
    transform: translateY(-2px);
    box-shadow: 0 3px 6px var(--color-shadow);
}

.kanban-task-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.kanban-task-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

/* Agenda Layout */
.agenda-container {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 4px var(--color-shadow);
}

.agenda-day {
    margin-bottom: var(--spacing-lg);
}

.agenda-day-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
}

.agenda-day-name {
    font-weight: 600;
    margin-right: var(--spacing-sm);
}

.agenda-day-date {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.agenda-tasks {
    padding-left: var(--spacing-lg);
}

.agenda-task {
    display: flex;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.agenda-task::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-primary);
}

.agenda-task-time {
    min-width: 80px;
    color: var(--color-text-light);
}

.agenda-task-content {
    flex: 1;
}

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

.agenda-task-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* ========= Notes Styles ========= */
.notes-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.note-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: 0 2px 4px var(--color-shadow);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
}

.note-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px var(--color-shadow);
}

.note-title {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.note-content {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    flex: 1;
}

.note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.note-date {
    font-style: italic;
}

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

/* ========= Statistics Styles ========= */
.stats-period-selector {
    display: flex;
    gap: var(--spacing-sm);
}

.period-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--color-surface);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

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

.stats-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px var(--color-shadow);
}

.stats-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    text-align: center;
}

.chart-container {
    position: relative;
    height: 250px;
}

/* ========= Settings Styles ========= */
.settings-container {
    max-width: 800px;
    margin: 0 auto;
}

.settings-group {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 2px 4px var(--color-shadow);
}

.settings-group h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.setting-item:last-child {
    margin-bottom: 0;
}

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: var(--transition-fast);
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition-fast);
}

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

input:focus + .slider {
    box-shadow: 0 0 1px var(--color-primary);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* ========= Modal Styles ========= */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px var(--color-shadow);
    animation: modalFadeIn 0.3s ease;
}

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

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

.modal-header h3 {
    margin: 0;
    color: var(--color-primary);
}

.close-modal {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.close-modal:hover {
    color: var(--color-accent);
}

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

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
}

/* Checkbox Container */
.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    position: relative;
    display: inline-block;
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-sm);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

/* Day Detail Modal */
.day-tasks-list {
    margin-bottom: var(--spacing-md);
}

.day-task-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    background-color: var(--color-background);
    transition: transform var(--transition-fast);
    cursor: pointer;
}

.day-task-item:hover {
    transform: translateX(5px);
}

.day-task-time {
    min-width: 80px;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.day-task-content {
    flex: 1;
}

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

.day-task-category {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

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

/* ========= Responsive Styles ========= */
@media (max-width: 1024px) {
    .app-header {
        flex-wrap: wrap;
    }
    
    .header-actions {
        margin-left: auto;
    }
    
    .dashboard-grid,
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        left: -250px;
        width: 250px;
        height: 100vh;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-lg) var(--spacing-md);
        box-shadow: 2px 0 5px var(--color-shadow);
        transition: left var(--transition-normal);
        z-index: 200;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .app-header {
        justify-content: space-between;
    }
    
    .logo-container {
        flex: 1;
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .week-header,
    .week-grid {
        grid-template-columns: 40px repeat(7, 1fr);
    }
    
    .time-column, 
    .day-column,
    .time-slot,
    .day-slot {
        padding: var(--spacing-xs);
        font-size: var(--font-size-xs);
    }
    
    .calendar-day {
        min-height: 80px;
    }
}

@media (max-width: 576px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
    }
    
    .app-title {
        font-size: var(--font-size-lg);
    }
    
    .app-subtitle {
        display: none;
    }
    
    .header-actions {
        width: 100%;
        margin-top: var(--spacing-sm);
        justify-content: space-between;
    }
    
    .screen-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .date-navigation {
        width: 100%;
        justify-content: space-between;
    }
    
    .layout-toggle {
        width: 100%;
        justify-content: space-between;
    }
    
    .filter-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .week-header {
        grid-template-columns: 30px repeat(7, 1fr);
    }
    
    .week-grid {
        grid-template-columns: 30px repeat(7, 1fr);
    }
    
    .day-column {
        writing-mode: vertical-lr;
        transform: rotate(180deg);
        text-align: center;
        padding: var(--spacing-xs);
        height: 80px;
    }
    
    .day-slot {
        min-height: 40px;
    }
    
    .modal-content {
        max-width: 100%;
    }
}

/* ========= Utility Classes ========= */
.text-center {
    text-align: center;
}

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

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-1 {
    gap: var(--spacing-sm);
}

.gap-2 {
    gap: var(--spacing-md);
}

.w-full {
    width: 100%;
}

.font-bold {
    font-weight: 700;
}

.text-sm {
    font-size: var(--font-size-sm);
}

.text-xs {
    font-size: var(--font-size-xs);
}

.text-lg {
    font-size: var(--font-size-lg);
}

.text-primary {
    color: var(--color-primary);
}

.text-light {
    color: var(--color-text-light);
}

.rounded {
    border-radius: var(--border-radius-md);
}

.shadow {
    box-shadow: 0 2px 4px var(--color-shadow);
}

/* Category Colors */
.category-personal {
    background-color: var(--color-pink);
}

.category-work {
    background-color: var(--color-purple);
}

.category-study {
    background-color: var(--color-green);
}

.category-health {
    background-color: var(--color-yellow);
}

.category-other {
    background-color: var(--color-coral);
}