:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #16181d;
  --muted: #6b7280;
  --line: #e3e5ea;
  --accent: #3f4bd8;
  --danger: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --card: #1c1f27;
    --text: #eceef3;
    --muted: #9aa1ad;
    --line: #2b2f39;
    --accent: #7c86ff;
    --danger: #ff8a80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 32px;
}

h1 { margin: 0 0 8px; font-size: 22px; }
.subtitle { margin: 0 0 24px; color: var(--muted); }

label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--muted); }

input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: transparent;
  color: var(--text);
  font-size: 16px;
}

input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  width: 100%;
  margin-top: 18px;
  padding: 12px;
  border: 0;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
}

button:disabled { opacity: .6; cursor: default; }
button:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }

.error {
  margin: 14px 0 0;
  color: var(--danger);
  font-size: 14px;
}