style.css

/* General Styles */
body {
    background-color: #121212; /* Dark background color */
    padding: 0;
    margin: 0;
    font-family: 'Arial', sans-serif;
    color: #e0e0e0; /* Light text color for better readability */
}

/* Container */
.container {
    background-color: #1e1e1e; /* Slightly lighter dark color for the container */
    margin: auto;
    margin-top: 20px;
    padding: 20px;
    height: auto; /* Adjust height based on content */
    width: 90%;
    max-width: 500px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
}

/* Center Alignment */
.center {
    text-align: center;
    width: 100%;
}

/* Input Fields */
.input {
    height: 40px;
    width: 100%;
    max-width: 150px;
    border-radius: 5px;
    background-color: #333; /* Darker background for inputs */
    border: 1px solid #444; /* Slightly lighter border */
    color: #e0e0e0; /* Light text color */
    text-align: center;
    font-size: 14px;
    margin: 8px 0;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.input:focus {
    border-color: #bb86fc; /* Light purple for focus */
    box-shadow: 0 0 8px rgba(187, 134, 252, 0.3);
    outline: none;
}

/* Labels and Sections */
.contain {
    padding: 10px 0;
    font-size: 16px;
    color: #e0e0e0;
}

h2 {
    text-align: center;
    color: #bb86fc; /* Light purple for headings */
    margin: 10px 0;
}

/* Buttons */
.btn {
    background-color: #6200ee; /* Purple button */
    border: none;
    border-radius: 5px;
    color: #fff;
    padding: 10px 20px;
    text-align: center;
    font-size: 16px;
    transition: background-color 0.3s, transform 0.3s;
    cursor: pointer;
    margin: 10px 0;
    display: inline-block;
}

.btn:hover {
    background-color: #3700b3; /* Darker purple for hover */
    transform: scale(1.05);
}

.btn:active {
    background-color: #03dac6; /* Teal for active state */
    transform: scale(0.98);
}

.btn-clear {
    background-color: #cf6679; /* Red for clear button */
}

.btn-clear:hover {
    background-color: #b00020; /* Darker red for hover */
}

/* Result Section */
.result {
    margin-top: 10px;
    padding: 10px;
    background-color: #333; /* Dark background for result section */
    border-radius: 10px;
}

/* Name and USN Container */
.name-usn-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    width: 48%; /* Adjust width to fit within the container */
}

.input-group label {
    margin-bottom: 5px;
}

.name-group {
    flex: 1;
    margin-right: 10px; /* Space between name and USN fields */
}

.usn-group {
    flex: 1;
}

/* Tooltip Styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 160px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%; /* Position the tooltip above the input */
    left: 50%;
    margin-left: -80px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* Media Queries for Responsive Design */

/* For devices with a max width of 600px (mobile phones) */
@media (max-width: 600px) {
    .container {
        width: 95%; /* Make container width more fluid */
        padding: 10px;
        margin-top: 10px;
    }

    .input {
        height: 35px;
        font-size: 14px;
        max-width: 100%; /* Adjust width to fit container */
    }

    .btn {
        padding: 8px 16px;
        font-size: 14px;
    }

    h2 {
        font-size: 20px;
    }

    .contain {
        font-size: 14px;
    }

    .result {
        font-size: 16px;
        padding: 8px;
    }

    /* Adjustments for smaller screens */
    .name-usn-container {
        flex-direction: column;
    }
}

/* For devices with a max width of 400px (smaller mobile phones) */
@media (max-width: 400px) {
    .container {
        width: 100%; /* Full width for very small screens */
    }

    .input {
        height: 30px;
        font-size: 12px;
        max-width: 100%; /* Adjust width to fit container */
    }

    .btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    h2 {
        font-size: 18px;
    }

    .contain {
        font-size: 12px;
    }

    .result {
        font-size: 14px;
        padding: 6px;
    }
}