:root {
  --bg: #f6f6f9;
  --card: #ffffff;
  --text: #17171c;
  --muted: #5d5d6b;
  --border: #e2e2ea;
  --input: #cfcfdb;
  --primary: #432dd7;
  --primary-fg: #ffffff;
  --danger: #b42318;
  --danger-bg: #fef3f2;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f14;
    --card: #17171f;
    --text: #f2f2f7;
    --muted: #a4a4b5;
    --border: #2a2a36;
    --input: #3a3a48;
    --primary: #7c6cf0;
    --primary-fg: #ffffff;
    --danger: #ff8a80;
    --danger-bg: #2a1414;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100dvh;
}
.shell {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px calc(24px + env(safe-area-inset-bottom));
  gap: 20px;
}
.brand { font-size: 30px; font-weight: 700; letter-spacing: -0.02em; color: var(--primary); }
.card {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 8px 24px rgb(0 0 0 / 0.04);
}
h1 { font-size: 22px; line-height: 1.25; margin: 0 0 6px; letter-spacing: -0.01em; }
.lead { color: var(--muted); margin: 0 0 20px; font-size: 15px; }
.muted { color: var(--muted); margin: 0; }
form { display: flex; flex-direction: column; gap: 14px; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; }
input {
  height: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--input);
  background: transparent;
  color: var(--text);
  padding: 0 12px;
  font: inherit;
  font-size: 16px;
}
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
button {
  height: 44px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: opacity 180ms cubic-bezier(0.4, 0, 0.2, 1);
}
button[disabled] { opacity: 0.6; cursor: progress; }
.primary { background: var(--primary); color: var(--primary-fg); }
.secondary { background: transparent; color: var(--text); border-color: var(--input); }
.link { background: none; border: 0; height: auto; padding: 0; color: var(--primary); font-weight: 500; font-size: 14px; align-self: flex-start; }
.row { display: flex; justify-content: space-between; align-items: center; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; margin: 18px 0; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.stack { display: flex; flex-direction: column; gap: 10px; }
.error {
  display: none;
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 14px;
}
.error.show { display: block; }
.foot { color: var(--muted); font-size: 13px; text-align: center; margin: 0; }
.foot a { color: inherit; }