:root {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #172033;
    background: #eef2f7;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
}

.page-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.demo-card {
    width: min(100%, 480px);
    background: #ffffff;
    border: 1px solid #dce3ec;
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 18px 55px rgba(23, 32, 51, 0.10);
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 7px 12px;
    border-radius: 999px;
    background: #e8eef8;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .02em;
}

h1 {
    margin: 18px 0 6px;
    font-size: clamp(24px, 5vw, 34px);
}

.organizer {
    margin: 0 0 18px;
    color: #667085;
}

.notice {
    margin: 0 auto 20px;
    padding: 10px 12px;
    border-radius: 10px;
    background: #fff4e5;
    border: 1px solid #f5d6a7;
    font-size: 13px;
    font-weight: 800;
}

.qr-wrap {
    width: 280px;
    height: 280px;
    margin: 0 auto 22px;
    border: 1px solid #d8dee8;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: #fff;
}

#qrcode img,
#qrcode canvas {
    display: block;
    max-width: 240px;
    max-height: 240px;
}

.status-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 0 0 16px;
}

.status-grid > div {
    border: 1px solid #e3e8ef;
    background: #f8fafc;
    border-radius: 12px;
    padding: 12px;
}

.label {
    display: block;
    color: #667085;
    font-size: 12px;
    margin-bottom: 4px;
}

.message {
    min-height: 24px;
    margin: 8px 0 16px;
    color: #475467;
}

button {
    width: 100%;
    border: 0;
    border-radius: 12px;
    padding: 13px 16px;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    background: #172033;
    color: #fff;
}

button:disabled {
    opacity: .6;
    cursor: wait;
}

.debug {
    margin-top: 18px;
    text-align: left;
    color: #667085;
    font-size: 12px;
}

.debug code {
    display: block;
    margin-top: 8px;
    padding: 10px;
    border-radius: 8px;
    overflow-wrap: anywhere;
    background: #f4f6f8;
    color: #344054;
}