:root {
  --bg: #0f1218;
  --card: #161a21;
  --raised: #1e232c;
  --border: rgba(255, 255, 255, 0.08);
  --text: #eef2f8;
  --muted: #9aa5b8;
  --mint: #3ee6a0;
  --mint-hover: #5cf0b4;
  --on-mint: #07130e;
  --danger: #f06a6a;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 24px 16px; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, rgba(62, 230, 160, 0.08), transparent 60%), var(--bg);
}
.card {
  width: 100%; max-width: 440px; background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 32px 28px; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
.logo { display: block; width: 220px; height: auto; margin: 0 0 20px; }
.overline { margin: 0 0 4px; font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--mint); }
h1 { margin: 0 0 8px; font-size: 22px; line-height: 1.3; }
.muted { margin: 0 0 16px; color: var(--muted); font-size: 15px; }
.muted strong { color: var(--text); font-weight: 600; }
.hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; }
label { display: block; margin: 14px 0 6px; font-size: 13px; color: var(--muted); }
input {
  width: 100%; height: 46px; padding: 0 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--raised);
  color: var(--text); font: inherit; outline: none;
}
input:focus { border-color: var(--mint); box-shadow: 0 0 0 3px rgba(62, 230, 160, 0.18); }
input.code, .mono { font-family: ui-monospace, Consolas, "Cascadia Mono", monospace; letter-spacing: 0.12em; }
input.code { font-size: 20px; text-transform: uppercase; }
button {
  width: 100%; height: 46px; margin-top: 18px; border-radius: 10px; border: 1px solid transparent; font: inherit;
  font-weight: 600; cursor: pointer;
}
button.primary { background: var(--mint); color: var(--on-mint); }
button.primary:hover { background: var(--mint-hover); }
button.ghost { background: transparent; color: var(--muted); border-color: var(--border); margin-top: 10px; }
button.ghost:hover { color: var(--text); }
button.provider { color: var(--text); margin-top: 10px; }
.or { display: flex; align-items: center; gap: 12px; margin: 18px 0 2px; color: var(--muted); font-size: 13px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--border); }
button:disabled { opacity: 0.55; cursor: progress; }
.error { margin: 16px 0 0; padding: 10px 12px; border-radius: 10px; background: rgba(240, 106, 106, 0.1); color: var(--danger); font-size: 14px; }
footer { margin-top: 20px; font-size: 13px; color: var(--muted); }
footer a { color: var(--muted); }
[hidden] { display: none !important; }