:root {
  --bg: #f6f8fc; --card: #ffffff; --text: #1b2333; --muted: #5d6779; --brand: #1565c0; --border: #dfe4ee;
  --error: #c62828; --ok: #2e7d32;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #10141c; --card: #181e29; --text: #e6e9ef; --muted: #9aa3b5; --brand: #64a8ff; --border: #2a3242; --error: #ff8a80; --ok: #81c784; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; gap: 14px; align-items: center; margin-bottom: 24px; }
header img { border-radius: 14px; }
h1 { margin: 0; font-size: 1.6rem; }
h2 { margin-top: 2rem; font-size: 1.15rem; }
a { color: var(--brand); }
.muted { color: var(--muted); margin: 0; }
ul { padding-left: 1.25rem; }
form { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; display: grid; gap: 14px; margin: 24px 0; }
label { display: grid; gap: 6px; font-weight: 600; }
label.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
input[type=email], input[type=password] { font: inherit; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); }
button { font: inherit; font-weight: 600; padding: 12px; border: 0; border-radius: 10px; background: var(--error); color: #fff; cursor: pointer; }
button:disabled { opacity: 0.6; cursor: default; }
#msg.error { color: var(--error); }
#msg.ok { color: var(--ok); font-weight: 600; }