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

body {
    background: linear-gradient(135deg, #6a11cb, #2575fc);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #fff;
}

.container {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.input-container {
    display: flex;
    gap: 10px;
}

#todo-input {
    flex: 1;
    padding: 10px;
    border-radius: 6px;
    border: none;
    outline: none;
    font-size: 16px;
}

#add-btn {
    padding: 10px 20px;
    background-color: #2575fc;
    border: none;
    border-radius: 6px;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s;
}

#add-btn:hover {
    background-color: #1a5de8;
}

#todo-list {
    list-style: none;
    margin-top: 20px;
}

.todo-item {
    background: rgba(255, 255, 255, 0.2);
    padding: 12px;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    transition: background 0.3s;
}

.todo-item.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

.delete-btn {
    background: #ff4b5c;
    border: none;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    color: #fff;
    transition: background 0.3s;
}

.delete-btn:hover {
    background: #e03b4f;
}