:root {
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-secondary: #14B8A6;
    --color-accent: #F97316;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #06B6D4;
    
    --color-background: #FAFBFC;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F8FAFC;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    --color-text-primary: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-muted: #94A3B8;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-backdrop: blur(16px);
    
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

[data-theme="dark"] {
    --color-background: #0F172A;
    --color-surface: #1E293B;
    --color-surface-hover: #334155;
    --color-border: #334155;
    --color-border-light: #475569;
    
    --color-text-primary: #F8FAFC;
    --color-text-secondary: #CBD5E1;
    --color-text-muted: #94A3B8;
    
    --glass-bg: rgba(30, 41, 59, 0.25);
    --glass-border: rgba(30, 41, 59, 0.18);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-background);
    color: var(--color-text-primary);
    transition: var(--transition);
    overflow-x: hidden;
}

.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* Particles Background */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.6;
}

.particle {
    position: absolute;
    background: var(--color-primary);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.7; }
    50% { transform: translateY(-20px) rotate(180deg); opacity: 0.3; }
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-backdrop);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 10;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-surface);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background: var(--color-surface-hover);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-secondary);
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Navigation */
.sidebar-nav {
    flex: 1;
}

.nav-section {
    margin-bottom: var(--spacing-2xl);
}

.nav-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.nav-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text-primary);
    transform: translateX(4px);
}

.nav-item.active {
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.nav-item span {
    flex: 1;
    text-align: left;
}

.task-count {
    background: rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

.nav-item:not(.active) .task-count {
    background: var(--color-border);
    color: var(--color-text-muted);
}

/* Categories */
.categories-list {
    margin-bottom: var(--spacing-md);
}

.category-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: var(--spacing-xs);
}

.category-item:hover {
    background: var(--color-surface-hover);
    transform: translateX(4px);
}

.category-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.add-category-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px dashed var(--color-border);
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.add-category-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.add-category-btn svg {
    width: 16px;
    height: 16px;
}

/* Pomodoro Widget */
.pomodoro-widget {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.pomodoro-circle {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.pomodoro-progress {
    width: 80px;
    height: 80px;
    transform: rotate(-90deg);
}

.pomodoro-progress circle:last-child {
    transition: stroke-dashoffset 1s ease-in-out;
}

.pomodoro-time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.pomodoro-controls {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.pomodoro-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: white;
}

.pomodoro-btn:hover {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.pomodoro-btn svg {
    width: 14px;
    height: 14px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-backdrop);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-lg) var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 20;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.header-left h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

/* Search Box */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    pointer-events: none;
}

.search-box input {
    width: 300px;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

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

/* Filter and Sort */
.filter-sort {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-sort select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.add-task-btn {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

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

.add-task-btn svg {
    width: 18px;
    height: 18px;
}

/* Views Container */
.views-container {
    flex: 1;
    padding: var(--spacing-2xl);
    position: relative;
}

.view {
    display: none;
    animation: slideInUp 0.5s ease-out;
}

.view.active {
    display: block;
}

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

/* List View */
.tasks-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.task-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: slideInRight 0.3s ease-out;
}

.task-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

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

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

.task-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
    margin-top: 2px;
}

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

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

.task-checkbox svg {
    width: 12px;
    height: 12px;
    opacity: 0;
    transform: scale(0);
    transition: var(--transition);
}

.task-checkbox.checked svg {
    opacity: 1;
    transform: scale(1);
}

.task-content {
    flex: 1;
}

.task-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.task-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

.task-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.task-priority {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.task-priority.high {
    background: rgba(249, 115, 22, 0.1);
    color: var(--color-accent);
}

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

.task-category {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-border-light);
    color: var(--color-text-secondary);
}

.task-due-date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.task-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.task-tag {
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.625rem;
    font-weight: 500;
    background: var(--color-border-light);
    color: var(--color-text-muted);
}

.task-actions {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: var(--transition);
}

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

.task-action {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--color-surface-hover);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-secondary);
}

.task-action:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.1);
}

.task-action svg {
    width: 16px;
    height: 16px;
}

/* Kanban Board */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    height: calc(100vh - 200px);
}

.kanban-column {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
}

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

.column-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.column-tasks {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 200px;
}

.kanban-task {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    cursor: grab;
    transition: var(--transition);
    animation: slideInUp 0.3s ease-out;
}

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

.kanban-task.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
    cursor: grabbing;
}

/* Calendar View */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.calendar-nav {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-surface-hover);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-secondary);
}

.calendar-nav:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.1);
}

.calendar-nav svg {
    width: 18px;
    height: 18px;
}

.calendar-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

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

.calendar-day {
    background: var(--color-surface);
    padding: var(--spacing-md);
    min-height: 120px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

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

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

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

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

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

.calendar-task {
    background: var(--color-border-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.625rem;
    truncate: true;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.analytics-card {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.analytics-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.analytics-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

/* Progress Ring */
.progress-ring {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.progress-ring svg {
    width: 120px;
    height: 120px;
    transform: rotate(-90deg);
}

.progress-ring circle:last-child {
    transition: stroke-dashoffset 1s ease-in-out;
}

.progress-text {
    position: absolute;
    text-align: center;
}

.progress-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.progress-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 200px;
}

/* Category Stats */
.category-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.category-stat {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.category-stat-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.category-stat-value {
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.achievement {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    background: var(--color-border-light);
    opacity: 0.5;
    transition: var(--transition);
}

.achievement.earned {
    background: rgba(16, 185, 129, 0.1);
    opacity: 1;
}

.achievement-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-surface);
}

.achievement-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.achievement-info p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal {
    background: var(--color-surface);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: var(--transition);
}

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

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

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

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

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

.modal-close svg {
    width: 18px;
    height: 18px;
}

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

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

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

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    color: white;
}

.fab:hover {
    transform: scale(1.1) translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.fab svg {
    width: 24px;
    height: 24px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 300px;
    transform: translateX(100%);
    transition: var(--transition);
    border-left: 4px solid var(--color-success);
}

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

.toast.error {
    border-left-color: var(--color-error);
}

.toast.warning {
    border-left-color: var(--color-warning);
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        padding: var(--spacing-md);
    }
    
    .sidebar-nav {
        display: none;
    }
    
    .header {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .header-left,
    .header-right {
        width: 100%;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .kanban-board {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .views-container {
        padding: var(--spacing-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .fab {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }
    
    .stats {
        gap: var(--spacing-md);
    }
    
    .header-right {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .filter-sort {
        width: 100%;
    }
    
    .filter-sort select {
        flex: 1;
    }
}

/* Loading Animation */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-left-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-muted);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-lg);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-border-light);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Selection */
::selection {
    background: rgba(59, 130, 246, 0.2);
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}