:root {
    color-scheme: light;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #f4f7fb;
    color: #172033;
}

* { box-sizing: border-box; }

body {
    min-height: 100vh;
    margin: 0;
    display: grid;
    place-items: center;
    padding: 24px;
    background: radial-gradient(circle at top, #e8f1ff 0, #f4f7fb 46%, #eef2f7 100%);
}

.verification-card {
    width: min(100%, 420px);
    padding: 32px;
    border: 1px solid #dbe3ef;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 20px 55px rgba(33, 54, 88, 0.14);
}

.shield {
    width: 54px;
    height: 54px;
    margin: 0 auto 18px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: #1677ff;
    color: #fff;
    font-size: 28px;
    font-weight: 800;
}

h1 {
    margin: 0;
    text-align: center;
    font-size: 25px;
}

.intro {
    margin: 12px 0 26px;
    text-align: center;
    color: #5f6b7a;
    line-height: 1.6;
}

.question {
    margin-bottom: 20px;
    padding: 20px;
    border-radius: 12px;
    background: #f0f6ff;
    color: #0958d9;
    text-align: center;
    font-size: 30px;
    font-weight: 750;
    letter-spacing: 2px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 650;
}

input,
button {
    width: 100%;
    min-height: 48px;
    border-radius: 10px;
    font: inherit;
}

input {
    margin-bottom: 14px;
    padding: 10px 14px;
    border: 1px solid #b8c4d6;
    background: #fff;
    font-size: 20px;
    text-align: center;
}

input:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(22, 119, 255, 0.28);
    outline-offset: 2px;
}

button {
    border: 0;
    padding: 11px 16px;
    background: #1677ff;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

button:hover:not(:disabled) { background: #0958d9; }
button:disabled { cursor: not-allowed; opacity: 0.55; }

.status {
    min-height: 24px;
    margin: 18px 0 10px;
    color: #596579;
    text-align: center;
    line-height: 1.5;
}

.secondary {
    min-height: 40px;
    background: transparent;
    color: #1677ff;
    font-weight: 600;
}

.secondary:hover:not(:disabled) { background: #edf5ff; }

noscript {
    display: block;
    margin-top: 14px;
    color: #b42318;
    text-align: center;
}

@media (max-width: 480px) {
    body { padding: 16px; }
    .verification-card { padding: 26px 20px; }
    h1 { font-size: 22px; }
    .question { font-size: 27px; }
}