:root {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #172033;
    background: #f4f7fb;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.page-shell { width: min(1100px, calc(100% - 32px)); margin: 0 auto; padding: 42px 0 64px; }
.hero { text-align: center; margin-bottom: 26px; }
.hero h1 { margin: 12px 0 8px; font-size: clamp(2rem, 5vw, 3.4rem); }
.hero p { margin: 0 auto; max-width: 720px; color: #5f6b7d; font-size: 1.05rem; }
.badge { display: inline-flex; padding: 7px 12px; border-radius: 999px; background: #e8f1ff; color: #1456a0; font-weight: 700; font-size: .82rem; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.card, .notice, .alert { background: #fff; border: 1px solid #dce3ec; border-radius: 18px; box-shadow: 0 14px 38px rgba(31, 45, 61, .07); }
.card { padding: 26px; }
.card h2, .notice h2 { margin-top: 0; }
.card p, .notice p { color: #5f6b7d; line-height: 1.65; }
.notice { padding: 22px 26px; margin-bottom: 22px; }
.notice.muted { margin-top: 22px; margin-bottom: 0; }
.alert { padding: 15px 18px; margin-bottom: 20px; border-color: #efb7b7; background: #fff2f2; color: #8b1f1f; }
label { display: block; margin: 16px 0 7px; font-weight: 700; }
input[type="file"], input[type="password"] { width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid #c8d2df; border-radius: 10px; background: #fff; }
button { width: 100%; margin-top: 20px; min-height: 48px; border: 0; border-radius: 11px; background: #165dab; color: #fff; font-weight: 800; cursor: pointer; }
button:hover { filter: brightness(.94); }
pre { overflow-x: auto; margin: 0; padding: 16px; border-radius: 12px; background: #101827; color: #e6edf7; }
code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
@media (max-width: 760px) {
    .page-shell { width: min(100% - 20px, 680px); padding-top: 24px; }
    .grid { grid-template-columns: 1fr; }
    .card, .notice { padding: 20px; border-radius: 14px; }
}