* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111;
    color: #fff;
}

.hidden {
    display: none !important;
}

.screen {
    min-height: 100vh;
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card,
.phone-shell {
    width: 100%;
    max-width: 420px;
    background: #1d1d1d;
    border-radius: 28px;
    padding: 28px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

h1 {
    margin-top: 0;
    font-size: 28px;
}

p {
    line-height: 1.5;
    color: #d6d6d6;
}

.qr-placeholder {
    width: 180px;
    height: 180px;
    margin: 24px auto 0;
    background: #fff;
    color: #111;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 12px;
}

.instructions {
    margin-top: 24px;
    padding: 16px;
    border-radius: 18px;
    background: #2a2a2a;
}

.bottom-nav {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: 12px;
    max-width: 420px;
    margin: auto;
    display: flex;
    justify-content: space-around;
    background: #222;
    border-radius: 22px;
    padding: 14px;
}

.bottom-nav a {
    color: #fff;
    text-decoration: none;
    font-size: 13px;
}