:root {
  --bg: #0c0f17;
  --fg: #f5f7fb;
  --card: rgba(12, 15, 23, 0.75);
  --muted: #a9b3c9;
  --line: rgba(255, 255, 255, 0.15);
}
html[data-theme="light"] {
  --bg: #f4f5f7;
  --fg: #111319;
  --card: rgba(255, 255, 255, 0.86);
  --muted: #46506a;
  --line: rgba(0, 0, 0, 0.12);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans", sans-serif;
  color: var(--fg);
  background:
    radial-gradient(1200px 500px at 10% 10%, rgba(196,160,82,.18), transparent 60%),
    radial-gradient(900px 400px at 90% 90%, rgba(196,160,82,.12), transparent 60%),
    var(--bg);
}
.wrap {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}
.card {
  width: min(720px, 96vw);
  border: 1px solid var(--line);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  background: var(--card);
  padding: 26px;
  box-shadow: 0 12px 35px rgba(0,0,0,.22);
}
.toolbar { display: flex; justify-content: flex-end; }
button {
  border: 1px solid var(--line);
  color: var(--fg);
  background: transparent;
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}
.brand {
  text-align: center;
  margin-top: 10px;
}
#logo {
  max-width: 330px;
  width: 70%;
  display: block;
  margin: 0 auto 10px auto;
  filter: drop-shadow(0 10px 22px rgba(0,0,0,.25));
}
h1 {
  margin: 4px 0 8px;
  letter-spacing: .28em;
  font-weight: 700;
}
.subtitle { text-align: center; margin: 8px 0; }
.hint { text-align: center; color: var(--muted); }
code {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px 6px;
}