:root {
  --bg: #f6f5f1; --card: #ffffff; --ink: #1d1d1b; --muted: #6b6a66;
  --accent: #2f6f9f; --accent-ink: #ffffff; --line: #dedcd6; --bad: #b3261e;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --card: #232321; --ink: #f0efea; --muted: #a09e97; --accent: #7fb3dc; --accent-ink: #0f1a24; --line: #3a3936; --bad: #ff7b72; }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--ink);
  font: 17px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex; align-items: center; justify-content: center;
  padding: max(16px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom));
}
.card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 28px 22px; width: 100%; max-width: 360px; text-align: center; }
.logo { display: block; margin: 0 auto 8px; }
h1 { font-size: 22px; margin: 0 0 20px; }
label { display: block; text-align: left; color: var(--muted); font-size: 14px; margin-bottom: 6px; }
input {
  width: 100%; font: inherit; font-size: 22px; letter-spacing: 2px; padding: 14px 16px;
  border: 1.5px solid var(--line); border-radius: 12px; background: var(--bg); color: var(--ink);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
button {
  width: 100%; margin-top: 14px; padding: 16px; font: inherit; font-weight: 600; font-size: 18px;
  border: 0; border-radius: 12px; background: var(--accent); color: var(--accent-ink);
}
button:disabled { opacity: .6; }
#msg { color: var(--bad); min-height: 1.4em; margin: 12px 0 0; }