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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg,
        #a9a9a9 0%,
        #d9d9d9 79.7%,
        #ffa500 79.8%,
        #ffa500 80.2%,
        #222222 80.3%,
        #444444 100%);
    color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 30px;
    background-color: #f0f0f0;
    border: 1px solid #999;
    border-radius: 4px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
    background-image: linear-gradient(135deg, #e8e8e8, #e0e0e0);
}

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

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: #222;
}

#details {
    margin-bottom: 20px;
}

#details p {
    margin-bottom: 10px;
    color: #444;
}

strong {
    color: #222;
}

button {
    background: linear-gradient(180deg, #28a745, #2a9146); /* Subtle vertical gradient */
    color: #fff;
    width: 100%; /* Full width button */
    padding: 10px 25px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    justify-content: center; /* Center the text within the button */
    align-items: center;
    position: relative; /* Positioning for the lock icon and separator */
    transition: background-color 0.3s, transform 0.3s;
}

button:hover {
    background: linear-gradient(180deg, #238c3f, #218838); /* Slightly darker vertical gradient on hover */
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

button .icon-container {
    width: 40px; /* Fixed width to create a square area */
    height: 40px; /* Equal height to make it square */
    display: flex;
    justify-content: center; /* Center horizontally */
    align-items: center; /* Center vertically */
    position: absolute;
    left: 0;
    background-color: rgba(0, 0, 0, 0.1); /* Optional subtle background for the icon region */
}

button .icon-container::after {
    content: ""; /* Separator line */
    position: absolute;
    right: -1px; /* Align to the right edge of the icon */
    width: 1px;
    height: 100%;
    background-color: #fff; /* Separator color */
}

button span {
    margin-left: 40px; /* Offset text to account for the icon area */
}

textarea {
    width: 100%;
    height: 250px;
    background-color: #e7e7e7;
    color: #222;
    border: 1px solid #999;
    padding: 10px;
    margin: 0 0 5px;
    resize: none;
    font-family: monospace;
    font-size: 0.7em;
}

textarea[readonly] {
    opacity: 0.95;
}

.hidden {
    display: none;
}

#errorMessage {
    color: #ff4d4d;
    margin-top: 10px;
}

/* Accent colors for highlights */
#letter_writing_set {
    color: #555;
}

#key_name {
    color: #222;
}