/* TaskMaster - Modern Task Management App Styles */
:root {
    /* Light Mode Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Accent Colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
    --gradient-card: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
}

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

body {
    font-family: 'Inter', 'Noto Sans Bengali', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background var(--transition-normal), color var(--transition-normal);
    line-height: 1.6;
}

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

/* Header */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(var(--bg-card), 0.9);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
}

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

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    width: 50px;
    height: 28px;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--primary);
}

.theme-toggle.active {
    background: var(--primary);
    border-color: var(--primary);
}

.theme-toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.theme-toggle.active .theme-toggle-slider {
    transform: translateX(22px);
}

/* Main Content */
.main {
    flex: 1;
    padding: 2rem 1.5rem;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* Stats Cards */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Add Task Form */
.add-task-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.add-task-form {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.task-input {
    flex: 1;
    min-width: 200px;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.task-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.add-btn {
    padding: 0.875rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

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

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

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* Task List */
.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Task Item */
.task-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    animation: slideIn 0.3s ease;
}

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

.task-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

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

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

/* Checkbox */
.task-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

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

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

.task-checkbox.checked::after {
    content: "✓";
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
}

/* Task Content */
.task-content {
    flex: 1;
    min-width: 0;
}

.task-text {
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-word;
    transition: color var(--transition-fast);
}

.task-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.action-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.action-btn.edit {
    background: var(--bg-secondary);
    color: var(--info);
}

.action-btn.edit:hover {
    background: var(--info);
    color: white;
}

.action-btn.delete {
    background: var(--bg-secondary);
    color: var(--danger);
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.empty-text {
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-brand {
    font-weight: 600;
    color: var(--primary);
}

/* Progress Bar */
.progress-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    height: 8px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-shake {
    animation: shake 0.3s ease;
}

/* Responsive Design */
@media (max-width: 640px) {
    .header-content {
        padding: 0 0.5rem;
    }
    
    .logo-text {
        font-size: 1.25rem;
    }
    
    .main {
        padding: 1rem;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .add-task-form {
        flex-direction: column;
    }
    
    .add-btn {
        width: 100%;
        justify-content: center;
    }
    
    .task-actions {
        opacity: 1;
    }
    
    .action-btn {
        width: 32px;
        height: 32px;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

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

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