:root {
  --bg: #f6f7fb; --card: #ffffff; --fg: #141824; --muted: #5b6275; --line: #dde1ea;
  --accent: #3b5bdb; --accent-fg: #ffffff; --error: #b42318; --moon: #c9d2f3;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1118; --card: #171b26; --fg: #e9ecf4; --muted: #a2a9bb; --line: #2a3142;
    --accent: #7b93ff; --accent-fg: #0e1118; --error: #ff8a80; --moon: #3a4466;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh; min-height: 100dvh; display: grid; place-items: center; padding: 16px;
  background: var(--bg); color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.card {
  width: 100%; max-width: 400px; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 20px; text-align: center;
}
.moon {
  width: 56px; height: 56px; margin: 0 auto 12px; border-radius: 50%;
  box-shadow: inset -14px -6px 0 0 var(--moon);
}
.awake .moon { box-shadow: inset 0 0 0 28px var(--accent); transition: box-shadow 250ms ease; }
h1 { font-size: 1.35rem; margin: 0 0 8px; }
.muted { color: var(--muted); margin: 0 0 16px; }
.small { font-size: .85rem; margin: 16px 0 0; }
form { display: grid; gap: 8px; text-align: left; }
label { font-weight: 600; font-size: .9rem; }
input, button { font: inherit; min-height: 48px; border-radius: 10px; }
input {
  width: 100%; padding: 0 12px; border: 1px solid var(--line); background: transparent; color: var(--fg);
}
button {
  border: 0; background: var(--accent); color: var(--accent-fg); font-weight: 600; cursor: pointer;
}
button:disabled { opacity: .6; cursor: progress; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.progress { margin-top: 8px; }
.bar { height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 400ms ease; }
.error { color: var(--error); margin: 16px 0 0; }
[hidden] { display: none !important; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }