*, *::before, *::after {
    box-sizing: border-box;
}

body {
    background-color: #0f0a0f;
    color: #f9ebf9;
    min-height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

#main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    padding: 20px;
    gap: 20px;
}

/* TITLE */
#title {
    text-align: center;
    margin-bottom: 4px;
    font-size: 28px;
    letter-spacing: 4px;
    color: #f89af8;
}

/* CARD */
#card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    background-color: #1a121a;
    border: 1px solid #f9ebf920;
    border-radius: 4px;
    padding: 24px 28px;
    width: 100%;
    max-width: 360px;
}

/* INPUT ROW */
.input-row {
    display: flex;
    gap: 6px;
    width: 100%;
}

#input {
    flex: 1;
    height: 38px;
    background-color: #0f0a0f;
    border: 2px solid #f9ebf960;
    color: #f9ebf9;
    font-size: 13px;
    font-family: monospace, 'Courier New';
    padding: 0 10px;
    outline: none;
    border-radius: 3px;
    transition: border-color 0.15s ease;
    letter-spacing: 1px;
}

#input::placeholder {
    color: #f9ebf950;
    font-style: italic;
}

#input:focus {
    border-color: #f89af8;
}

/* BUTTONS */
#btn, #download-btn {
    height: 38px;
    background-color: #0f0a0f;
    border: 2px solid #f9ebf9;
    color: #f9ebf9;
    font-size: 13px;
    cursor: pointer;
    transition: 0.15s ease;
    letter-spacing: 1px;
    border-radius: 3px;
    padding: 0 14px;
}

#btn:hover, #download-btn:hover {
    background-color: #f9ebf9;
    color: #0f0a0f;
}

#btn:active, #download-btn:active {
    background-color: #f89af8;
    color: #0f0a0f;
}

#download-btn {
    width: 100%;
    height: 32px;
    font-size: 13px;
}

/* DIVIDER */
.divider {
    width: 100%;
    height: 1px;
    background: #f9ebf920;
}

/* QR WRAPPER */
#qr-wrapper {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
    animation: fadeIn 0.2s ease;
}

#qr-wrapper.visible {
    display: flex;
}

#qrcode {
    background: #fff;
    border: 2px solid #f9ebf9;
    border-radius: 3px;
    padding: 10px;
    line-height: 0;
}

#qrcode canvas, #qrcode img {
    display: block;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 10px;
    font-size: 12px;
    color: #f89af850;
    letter-spacing: 2px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* RESPONSIVE */
@media (max-width: 500px) {
    #card {
        padding: 18px 16px;
    }
}