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

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #0a192f;  /* Dark blue background */
}

.container {
    width: 100vw;
    /* min-height: 100vh; */
    display: flex;
    justify-content: center;
    align-items: top;
    padding: 3rem;
}

.tracker {
    min-width: 500px;
    max-width: 800px;    
    display: flex;
    flex-direction: column;
}

.add-btn::before{
    content: '+ ';
}

.add-btn {
    max-width: 200px;
    font-size: 1.5rem;
    padding: 0.6rem 2rem;
    background-color: #64ffda;  /* Neon mint */
    color: #0a192f;  /* Dark blue text */
    border: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.add-btn:hover {
    background-color: #4dd5bd;
    box-shadow: 0 0 15px rgba(100, 255, 218, 0.5);
}

input {
    border: none;
    background-color: transparent;  /* Subtle neon background */
    border-bottom: 2px solid #64ffda;  /* Neon mint border */
    padding: 1rem;
    font-size: 1.2rem;
    margin: 1rem 0;
    color: #64ffda;  /* Neon mint text */
}

input::placeholder {
    font-size: 2rem;
    color: rgba(100, 255, 218, 0.3);  /* Subtle neon placeholder */
}

ul {
    list-style: none;  
}

li {
    font-size: 1.5rem;
    font-weight: 700;
    border: 1px solid #64ffda;  /* Neon mint border */
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(100, 255, 218, 0.2);  /* Neon glow effect */
    color: #64ffda;  /* Neon mint text */
    background-color: rgba(100, 255, 218, 0.05);  /* Very subtle background */
    
    display: flex;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.list-item-blue {
    color: blue; 
}

.list-item-yellow {
    color: yellow; 
}

.list-item-red {
    color: red; 
}

.active {
    border: 4px solid yellow; 
}

.done {
    background-color: lightgreen;
    color: darkslateblue;
}


li:hover {
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);  /* Enhanced glow on hover */
    transform: translateY(-2px);
}

li > button {
    border: none;
    background-color: transparent;
    font-size: 1.5rem;
    color: #ff6b6b;  /* Neon red for delete button */
    transition: color 0.3s ease;
}

li > button:hover {
    color: #ff4747;  /* Brighter red on hover */
}