:root {
    /* Light theme variables */
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --text-color: #333;
    --text-light: #666;
    --border-color: #ddd;
    --bg-color: #f5f6fa;
    --card-bg: #fff;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #60a5fa;
    --secondary-color: #94a3b8;
    --success-color: #34d399;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
    --text-color: #e2e8f0;
    --text-light: #94a3b8;
    --border-color: #334155;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.todo-app {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    background-color: var(--bg-color);
}

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.app-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    height: 38px;
    font-size: 1rem;
}

.primary-btn:hover {
    background-color: #357abd;
}

.secondary-btn {
    background-color: #fff;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.secondary-btn:hover {
    background-color: #f0f7ff;
}

/* 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: 20px;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 2rem auto;
    padding: 2rem;
    width: 90%;
    max-width: 600px;
    border-radius: 8px;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
    color: var(--text-color);
}

.close-modal {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

input[type="text"],
input[type="date"],
input[type="time"],
textarea,
select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    background-color: var(--card-bg);
    color: var(--text-color);
}

input[type="text"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
textarea:focus,
select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Todo Container Styles */
.todo-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

/* Sidebar Styles */
.sidebar {
    border-right: 1px solid var(--border-color);
    padding-right: 1.5rem;
}

.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.1);
}

.search-box i {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    pointer-events: none;
}

.filter-group {
    margin-bottom: 1.5rem;
}

.filter-group h4 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

/* Filter Buttons */
.filter-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.75rem 1rem;
    border: none;
    background: none;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
    margin-bottom: 0.25rem;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background-color: var(--primary-color);
    transform: scaleY(0);
    transition: transform 0.2s ease;
}

.filter-btn:hover {
    color: var(--primary-color);
    background-color: #f0f7ff;
    padding-left: 1.5rem;
}

.filter-btn:hover::before {
    transform: scaleY(1);
}

.filter-btn.active {
    color: var(--primary-color);
    background-color: #f0f7ff;
    font-weight: 500;
    padding-left: 1.5rem;
}

.filter-btn.active::before {
    transform: scaleY(1);
}

/* Todo List Styles */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.todo-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: start;
    transition: var(--transition);
    margin-bottom: 1rem;
}

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

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

.todo-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.todo-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.todo-title {
    font-weight: 500;
}

.todo-description {
    color: var(--text-light);
    font-size: 0.9rem;
}

.todo-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-light);
}

.todo-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

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

.todo-actions button {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.todo-actions button:hover {
    color: var(--primary-color);
    background-color: #f0f7ff;
}

/* Priority Badges */
.priority-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.priority-high {
    background-color: rgba(220, 38, 38, 0.2);
    color: #f87171;
}

.priority-medium {
    background-color: rgba(217, 119, 6, 0.2);
    color: #fbbf24;
}

.priority-low {
    background-color: rgba(22, 163, 74, 0.2);
    color: #34d399;
}

/* Category Badges */
.category-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    background-color: rgba(79, 70, 229, 0.2);
    color: #818cf8;
}

/* Stats Section */
.task-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.stat-item {
    text-align: center;
    padding: 1rem;
    border-radius: 8px;
    background-color: var(--card-bg);
    transition: var(--transition);
}

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

.stat-label {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Remove calendar styles */
.calendar-view,
.calendar-day {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .todo-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-right: 0;
        padding-bottom: 1.5rem;
        margin-bottom: 1.5rem;
    }

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

    .task-stats {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        margin: 1rem auto;
        padding: 1.5rem;
    }

    .form-row {
        flex-direction: column;
    }

    .form-row .form-group {
        width: 100%;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.todo-item {
    animation: fadeIn 0.3s ease;
}

/* Footer Styles */
.app-footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.app-footer p {
    margin: 0;
}

/* Confirmation Modal Styles */
.confirm-modal-content {
    max-width: 400px;
    text-align: center;
}

.confirm-modal-content h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.confirm-modal-content p {
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.confirm-modal-content .form-actions {
    justify-content: center;
}

#confirm-ok {
    background-color: var(--danger-color);
}

#confirm-ok:hover {
    background-color: #c0392b;
}

#confirm-cancel {
    border-color: var(--text-light);
    color: var(--text-light);
}

#confirm-cancel:hover {
    background-color: #f5f5f5;
}

/* Theme Toggle Switch */
.switch {
    font-size: 17px;
    position: relative;
    display: inline-block;
    width: 64px;
    height: 38px;
    margin-right: 1rem;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #73C0FC;
    transition: .4s;
    border-radius: 30px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 34px;
    width: 34px;
    border-radius: 20px;
    left: 2px;
    bottom: 2px;
    z-index: 2;
    background-color: #e8e8e8;
    transition: .4s;
}

.sun svg {
    position: absolute;
    top: 7px;
    left: 36px;
    z-index: 1;
    width: 24px;
    height: 24px;
}

.moon svg {
    fill: #73C0FC;
    position: absolute;
    top: 7px;
    left: 5px;
    z-index: 1;
    width: 24px;
    height: 24px;
}

.sun svg {
    animation: rotate 15s linear infinite;
}

@keyframes rotate {
    0% {
        transform: rotate(0);
    }

    100% {
        transform: rotate(360deg);
    }
}

.moon svg {
    animation: tilt 5s linear infinite;
}

@keyframes tilt {
    0% {
        transform: rotate(0deg);
    }

    25% {
        transform: rotate(-10deg);
    }

    75% {
        transform: rotate(10deg);
    }

    100% {
        transform: rotate(0deg);
    }
}

.input:checked+.slider {
    background-color: #183153;
}

.input:focus+.slider {
    box-shadow: 0 0 1px #183153;
}

.input:checked+.slider:before {
    transform: translateX(30px);
}

/* Dark mode adjustments for the toggle */
[data-theme="dark"] .slider {
    background-color: #183153;
}

[data-theme="dark"] .input:checked+.slider {
    background-color: #73C0FC;
}

[data-theme="dark"] .moon svg {
    fill: #e8e8e8;
}

[data-theme="dark"] .sun svg {
    fill: #183153;
}