:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --accent: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

h1 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 30px;
    font-weight: 600;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.input-group input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
}

button:hover {
    background-color: var(--secondary);
    transform: translateY(-2px);
}

.add-btn {
    display: flex;
    align-items: center;
    gap: 8px;
}

.todo-list {
    margin-top: 30px;
}

.todo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--light);
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    transition: all 0.3s;
}

.todo-item:hover {
    transform: translateX(5px);
    box-shadow: var(--box-shadow);
}

.todo-info {
    flex: 1;
}

.todo-name {
    font-weight: 500;
    margin-bottom: 5px;
}

.todo-date {
    font-size: 14px;
    color: #6c757d;
    display: flex;
    align-items: center;
    gap: 5px;
}

.todo-actions {
    display: flex;
    gap: 10px;
}

.delete-btn {
    background-color: var(--danger);
    padding: 8px 12px;
}

.delete-btn:hover {
    background-color: #d1144a;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #6c757d;
}

.empty-state i {
    font-size: 50px;
    margin-bottom: 20px;
    color: #dee2e6;
}

@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
    }
}