:root {
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --bg: #f4f6f8; --panel: #ffffff; --fg: #17212b; --muted: #5a6775; --line: #dce2e8;
  --accent: #1f6a99; --on-accent: #ffffff; --bad: #b42b1c; --ok: #1d7448; --ring: #4a9cc9;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e141a; --panel: #151d25; --fg: #e5ecf2; --muted: #93a2b1; --line: #263340; --accent: #64addb; --on-accent: #08131c; --bad: #f2735f; --ok: #4fc58c; color-scheme: dark; }
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--fg); }
body { font-family: var(--font-body); font-size: 15px; line-height: 1.45; display: grid; place-items: center; min-height: 100vh;
  padding: 24px max(16px, env(safe-area-inset-right, 0px)) 24px max(16px, env(safe-area-inset-left, 0px)); }
.auth { width: min(100%, 24rem); background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 28px; display: grid; gap: 16px; }
.brand { display: flex; gap: 12px; align-items: center; }
.brand svg { flex: none; }
.eyebrow { margin: 0; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
h1 { margin: 0; font-family: var(--font-display); font-weight: 400; font-size: 26px; line-height: 1.2; }
p.lead { margin: 0; color: var(--muted); }
form { display: grid; gap: 12px; }
label { font-size: 13px; font-weight: 600; display: grid; gap: 4px; }
input { font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; min-height: 42px; width: 100%; }
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.hint { font-weight: 400; color: var(--muted); font-size: 12px; }
button { font: inherit; font-weight: 600; min-height: 42px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); cursor: pointer; }
button[disabled] { opacity: .6; cursor: default; }
.msg { min-height: 1.3em; font-size: 14px; }
.msg.bad { color: var(--bad); }
.msg.ok { color: var(--ok); }
.foot { font-size: 12px; color: var(--muted); margin: 0; }
#key-fields { display: grid; gap: 12px; }
#key-fields[hidden] { display: none; }
a { color: var(--accent); }
input[aria-invalid="true"] { border-color: var(--bad); }
#setupKey { font-family: ui-monospace, Menlo, Consolas, monospace; }