:root {
  --bg: #f5f5f3; --panel: #fff; --line: rgba(17,19,24,.1); --text: #111318; --muted: #686c75; --accent: #2f6fed;
  --err-bg: #ffe3e3; --err: #b01515;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0d0e11; --panel: #15171b; --line: rgba(255,255,255,.1); --text: #eef0f3; --muted: #9a9ea8; --accent: #6b9bff;
    --err-bg: rgba(255,90,90,.14); --err: #ff8080; }
}
:root { color-scheme: light dark; }
* { box-sizing: border-box; margin: 0; }
body { min-height: 100vh; background: var(--bg); color: var(--text); font: 14px/1.5 ui-sans-serif, -apple-system, "Segoe UI", system-ui, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
.auth { max-width: 400px; margin: 0 auto; padding: 72px 16px 40px; }
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.brand .mark { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; color: #fff; font-weight: 700; background: linear-gradient(135deg, #34a853, #2f6fed); }
.brand small { display: block; color: var(--muted); font-size: 12px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 26px; box-shadow: 0 10px 30px -18px rgba(0,0,0,.35); }
h1 { font-size: 20px; letter-spacing: -.02em; margin-bottom: 14px; }
label { display: block; font-size: 12.5px; font-weight: 600; color: var(--muted); margin-bottom: 12px; }
input { display: block; width: 100%; height: 40px; margin-top: 6px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: transparent; color: var(--text); font: inherit; font-size: 15px; outline: 0; }
input:focus { border-color: var(--accent); }
input.code { font-size: 22px; letter-spacing: .3em; text-align: center; font-feature-settings: "tnum"; }
button { width: 100%; height: 42px; margin-top: 6px; border: 0; border-radius: 10px; background: var(--text); color: var(--bg); font: inherit; font-weight: 600; cursor: pointer; }
button.link { background: none; color: var(--muted); text-decoration: underline; height: auto; margin-top: 14px; }
.error { background: var(--err-bg); color: var(--err); padding: 10px 12px; border-radius: 10px; margin-bottom: 14px; font-size: 13px; }
.hint { color: var(--muted); margin-bottom: 12px; }
.small { font-size: 12.5px; }
.steps { padding-left: 18px; color: var(--muted); margin-bottom: 10px; }
.steps li { margin-bottom: 6px; }
.qr { background: #fff; border-radius: 12px; padding: 10px; width: 210px; margin: 6px auto 12px; }
.qr svg { display: block; width: 100%; height: auto; }
code { background: var(--line); padding: 2px 6px; border-radius: 6px; font-size: 12px; word-break: break-all; }
.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 18px; }
.foot a { color: var(--muted); }