:root {
  --bg: #0f1218;
  --card: #171c25;
  --line: #2a3242;
  --text: #e8edf5;
  --muted: #93a0b4;
  --accent: #4c8dff;
  --ok: #39b96b;
  --err: #ff6b6b;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  display: flex; align-items: flex-start; justify-content: center; padding: 24px 16px 48px;
}
.card { width: 100%; max-width: 560px; background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 24px; }
.brand { font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
h1 { margin: 8px 0 6px; font-size: 26px; line-height: 1.2; }
.lead { margin: 0 0 20px; color: var(--muted); font-size: 15px; }
label { display: block; margin: 14px 0 6px; font-size: 15px; color: var(--muted); }
input { width: 100%; padding: 14px 14px; font-size: 17px; color: var(--text); background: #0d1117;
  border: 1px solid var(--line); border-radius: 10px; }
input:focus { outline: none; border-color: var(--accent); }
button { margin-top: 14px; width: 100%; padding: 15px; font-size: 17px; font-weight: 600;
  color: #fff; background: var(--accent); border: 0; border-radius: 10px; cursor: pointer; }
button.secondary { background: #232c3b; }
button:disabled { opacity: .55; cursor: default; }
.hint { color: var(--muted); font-size: 13.5px; margin: 12px 0 0; }
.who { border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin: 6px 0 4px; }
.who-title { font-size: 18px; font-weight: 600; }
.who-sub { color: var(--muted); font-size: 14px; margin-top: 4px; }
.field { border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-top: 14px; }
.field-head { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.field-title { font-weight: 600; }
.chip { font-size: 12.5px; color: var(--muted); border: 1px solid var(--line); padding: 2px 8px; border-radius: 999px; }
.chip.ok { color: var(--ok); border-color: rgba(57,185,107,.45); }
.error { margin-top: 16px; padding: 12px 14px; border-radius: 10px; background: rgba(255,107,107,.12);
  border: 1px solid rgba(255,107,107,.4); color: #ffb3b3; font-size: 15px; }
.done { margin-top: 16px; padding: 12px 14px; border-radius: 10px; background: rgba(57,185,107,.12);
  border: 1px solid rgba(57,185,107,.4); color: #b7f0cc; font-size: 15px; }
footer { margin-top: 22px; color: var(--muted); font-size: 12.5px; text-align: center; }