* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", system-ui, sans-serif;
}

body {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: #ffffff;
    width: 100%;
    max-width: 420px;
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 12px 35px rgba(0,0,0,0.25);
    text-align: center;
}

.brand h1 {
    color: #0b3c5d;
    font-size: 22px;
    font-weight: 700;
}

.brand span {
    font-size: 14px;
    color: #17a2b8;
    letter-spacing: 0.5px;
}

.tagline {
    font-size: 13px;
    color: #666;
    margin: 15px 0 20px;
}

.container input {
    width: 100%;
    padding: 13px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 14px;
    margin-bottom: 15px;
    outline: none;
}

.container input:focus {
    border-color: #17a2b8;
}

.container button {
    width: 100%;
    padding: 13px;
    border: none;
    background: #0b3c5d;
    color: #fff;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.container button:hover {
    background: #062a3f;
}

.qr-box {
    margin: 22px 0;
}

#downloadBtn {
    display: none;
    background: #17a2b8;
    color: #fff;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
}

footer {
    margin-top: 25px;
    font-size: 12px;
    color: #999;
}