/* BASE RESET & TYPOGRAPHY */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

:root {
    /* Light Theme Variables */
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    
    /* Categories */
    --cat-personal: #8b5cf6;
    --cat-work: #3b82f6;
    --cat-study: #f59e0b;
    --cat-health: #10b981;
    --cat-other: #64748b;
    
    /* Priorities */
    --priority-high: #ef4444; /* Red */
    --priority-medium: #f97316; /* Orange */
    --priority-low: #10b981; /* Green */
    
    /* Functional */
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --warning: #f59e0b;
    
    --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);
    
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    --transition: all 0.3s ease;
}

body.dark-mode {
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: var(--transition);
    height: 100vh;
    overflow: hidden;
}

/* APP LAYOUT */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.content-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* HEADER */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

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

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.datetime-display {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.5rem;
    border-radius: var(--radius-full);
}

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

/* SIDEBAR */
.sidebar {
    width: 300px;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 5;
    overflow-y: auto;
}

.sidebar-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.menu-toggle-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 1rem;
}

.widget h2 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid var(--border-color);
}

.stat-card:first-child {
    grid-column: span 2;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

.stat-card.success .stat-value { color: var(--success); }
.stat-card.warning .stat-value { color: var(--warning); }

/* Progress Bar */
.progress-section {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.progress-bar-bg {
    height: 8px;
    background-color: var(--border-color);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.5s ease-out;
}

/* Filters */
.filter-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}

.filter-btn:hover {
    background-color: var(--bg-color);
}

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

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

.filter-btn i {
    width: 20px;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Quote Widget */
.quote {
    background-color: rgba(59, 130, 246, 0.1);
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    margin-top: auto;
}

.quote-icon {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

.quote p {
    font-size: 0.875rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.5;
}

/* MAIN CONTENT */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.task-input-section h2 {
    font-size: 1.125rem;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.task-input-section h2 i {
    color: var(--primary-color);
}

/* Form Styles */
#task-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

input:focus, select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.main-input input {
    font-size: 1.1rem;
    padding: 1rem;
}

.options-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 120px;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.input-group label i {
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    height: 46px; /* Match input height roughly */
}

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

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

/* Task List Area */
.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    padding-left: 2.5rem;
    border-radius: var(--radius-full);
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

/* Task Card Component */
.task-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    animation: slideIn 0.3s ease forwards;
    position: relative;
    overflow: hidden;
}

.task-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: rgba(59, 130, 246, 0.3);
}

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

@keyframes slideOut {
    to { opacity: 0; transform: translateX(50px); }
}

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

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

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

/* Checkbox Custom Styling */
.task-checkbox-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    cursor: pointer;
    display: grid;
    place-content: center;
    transition: var(--transition);
}

.task-checkbox::before {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: white;
    font-size: 12px;
    transform: scale(0);
    transition: 0.2s transform ease-in-out;
}

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

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

/* Task Content */
.task-content {
    flex: 1;
    min-width: 0; /* Important for text truncation */
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.task-header-info {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.task-title {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0;
    word-break: break-word;
}

.task-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

/* Badges */
.badge {
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.badge-category { 
    background-color: var(--text-secondary); 
}

/* Priorities */
.priority-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

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

/* Overdue logic */
.task-card.overdue {
    border-left: 4px solid var(--danger);
}

.text-overdue {
    color: var(--danger) !important;
    font-weight: 600;
}

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

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

.action-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

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

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

/* Empty State */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state img {
    width: 200px;
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

/* MODAL */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    backdrop-filter: blur(2px);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--danger);
    margin-bottom: 1rem;
}

.modal-body {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.modal-task-title {
    font-weight: 600;
    margin: 0.5rem 0;
    padding: 0.5rem;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
    word-break: break-word;
}

.warning-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn-secondary {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

/* EDIT MODE STYLES */
.edit-input-wrapper {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.edit-input {
    flex: 1;
    padding: 0.4rem 0.6rem;
    font-size: 1.05rem;
}

.save-btn {
    background-color: var(--success);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 0 0.8rem;
    cursor: pointer;
}

/* RESPONSIVE DESIGN */
@media (max-width: 992px) {
    .options-row {
        flex-direction: column;
        align-items: stretch;
    }
    .input-group {
        width: 100%;
    }
    .btn-primary {
        margin-top: 1rem;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .app-container {
        position: relative;
    }
    
    .menu-toggle-btn {
        display: block;
        position: absolute;
        top: 1rem;
        left: 1rem;
        z-index: 20;
    }
    
    .header {
        padding-left: 4rem; /* Make room for hamburger */
    }

    .sidebar {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }
    
    .task-actions {
        opacity: 1; /* Always show actions on mobile */
    }
    
    .list-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .stat-card:first-child {
        grid-column: span 1;
    }
    
    .header-right .datetime-display {
        display: none; /* Hide time on very small screens */
    }
    
    .task-card {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .task-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 0.5rem;
        border-top: 1px dashed var(--border-color);
        padding-top: 0.5rem;
    }
}