body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;
    background: #111827;
    color: #E5E7EB;
}

.box {
    width: 400px;
    padding: 30px;
    text-align: center;
    background: #1F2937;
    border: 2px solid #E5E7EB;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(229, 231, 235, 0.15);
}

h1 {
    color: #E5E7EB;
}

input {
    width: 200px;
    padding: 12px;
    font-size: 16px;
    text-align: center;
    border: 2px solid #555;
    border-radius: 8px;
    background: #111827;
    color: #E5E7EB;
    outline: none;
    transition: 0.2s;
}

input:focus {
    border-color: #E5E7EB;
    box-shadow: 0 0 10px #E5E7EB;
}

button {
    margin-top: 15px;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: bold;
    border: 2px solid #E5E7EB;
    border-radius: 8px;
    background: #E5E7EB;
    color: #111827;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background: #D1D5DB;
}

button:active {
    transform: scale(0.95);
}

#message {
    min-height: 20px;
    color: #E5E7EB;
    font-size: 14px;
}

.result-title {
    margin-top: 30px;
    font-weight: bold;
}

.result-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

#result {
    flex: 1;
    min-height: 25px;
    margin: 0;
    padding: 15px;
    background: #111827;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    color: #E5E7EB;
    font-size: 20px;
    font-weight: bold;
    word-break: break-all;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

#copyButton {
    margin-top: 0;
    padding: 12px;
    white-space: nowrap;
}