:root {
  --bg: #f3f4f8;
  --bg-glow: rgba(106, 76, 255, .16);
  --card: #ffffff;
  --field: #f7f8fb;
  --line: #d5d9e5;
  --text: #1b1d28;
  --muted: #5b6480;
  --brand: #6a4cff;
  --brand2: #e04fd0;
  --focus: #6a4cff;
  --err-bg: #fdecee;
  --err: #a31526;
  --shadow: 0 12px 40px rgba(30, 35, 60, .14);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101117;
    --bg-glow: rgba(139, 115, 255, .18);
    --card: #1a1c26;
    --field: #20222e;
    --line: #363a4f;
    --text: #eceef6;
    --muted: #a3abc4;
    --focus: #a590ff;
    --err-bg: #3a1c24;
    --err: #ff9aa6;
    --shadow: 0 12px 40px rgba(0, 0, 0, .5);
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  background: radial-gradient(900px 500px at 50% -10%, var(--bg-glow), transparent 70%), var(--bg);
  color: var(--text);
  font: 16px/1.45 Inter, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}
.card {
  width: 100%;
  max-width: 400px;
  padding: 32px 28px 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  text-align: center;
}
.logo {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: #fff;
  font-size: 30px;
  box-shadow: 0 8px 22px rgba(106, 76, 255, .35);
}
h1 { margin: 0; font-size: 26px; line-height: 1.2; }
.sub { margin: 4px 0 24px; color: var(--muted); }
form { text-align: left; }
label { display: block; margin: 16px 0 6px; font-weight: 600; font-size: 14px; }
input {
  width: 100%;
  min-height: 48px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--field);
  color: inherit;
  font: inherit;
}
input:focus-visible, .toggle:focus-visible, .submit:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
.pw { position: relative; }
.pw input { padding-right: 104px; }
.toggle {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 96px;
  height: 44px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.toggle:hover { color: var(--text); }
.submit {
  width: 100%;
  min-height: 52px;
  margin-top: 24px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: #fff;
  font: inherit;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(106, 76, 255, .35);
}
.submit:hover { filter: brightness(1.06); }
.submit:disabled { opacity: .6; cursor: progress; }
.error {
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--err-bg);
  color: var(--err);
  font-size: 14px;
  font-weight: 600;
}
.error[hidden] { display: none; }
@media (max-width: 420px) {
  .card { padding: 28px 18px 22px; border-radius: 16px; }
}
@media (prefers-reduced-motion: no-preference) {
  .submit { transition: filter .15s; }
}