@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap');

:root {
    --primary-color: #4ade80;
    --primary-dark: #22c55e;
    --success-color: #16a34a;
    --danger-color: #f87171;
    --text-dark: #15803d;
    --text-light: #65a30d;
    --bg-color: #f0fdf4;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(34, 197, 94, 0.1), 0 2px 4px -2px rgba(34, 197, 94, 0.1);
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-dark);
    line-height: 1.5;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.task-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: var(--text-light);
}

.add-task-container {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

input[type="text"],
input[type="datetime-local"] {
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    width: 100%;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="datetime-local"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.add-btn,
.filter-btn,
.clear-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--primary-color);
    color: var(--white);
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.add-btn {
    width: 100%;
    justify-content: center;
}

.add-btn:hover,
.filter-btn:hover {
    background: var(--primary-dark);
}

.filter-container {
    margin-bottom: 2rem;
}

.search-box {
    position: relative;
    margin-bottom: 1rem;
}

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

.search-box input {
    padding-left: 2.5rem;
    width: 100%;
}

.filter-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    color: var(--text-light);
    border: 1px solid #86efac;
}

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

.tasks-container {
    margin-bottom: 2rem;
}

#task-list {
    list-style: none;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border: 1px solid #86efac;
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: var(--white);
}

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

.task-content {
    flex: 1;
    margin: 0 1rem;
}

.task-title {
    margin-bottom: 0.25rem;
}

.task-datetime {
    font-size: 0.875rem;
    color: var(--text-light);
}

.task-actions {
    display: flex;
    gap: 0.5rem;
}

.task-actions button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 0.25rem;
    color: var(--text-light);
    transition: color 0.3s ease;
}

.task-actions .edit-btn:hover {
    color: var(--primary-color);
}

.task-actions .delete-btn:hover {
    color: var(--danger-color);
}

.task-checkbox {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--primary-color);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
}

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

.task-checkbox.checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 0.875rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

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

.clear-container {
    text-align: center;
}

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

.clear-btn:hover {
    background: #dc2626;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.cancel-btn,
.save-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    flex: 1;
    transition: background-color 0.3s ease;
}

.cancel-btn {
    background: #dcfce7;
    color: var(--text-dark);
}

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

.save-btn:hover {
    background: var(--primary-dark);
}

.cancel-btn:hover {
    background: #bbf7d0;
}

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .input-group {
        flex-direction: column;
    }

    .task-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .task-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .filter-options {
        justify-content: center;
    }

    .task-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}

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

.task-item {
    animation: slideIn 0.3s ease;
}