:root {
  color-scheme: light;
  --background: var(--color-app-bg);
  --surface: var(--color-surface);
  --text: var(--color-text-primary);
  --muted: var(--color-text-secondary);
  --border: var(--color-border-strong);
  --brand: var(--color-primary);
  --brand-hover: var(--color-primary-hover);
  --danger: var(--color-danger);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--background);
}
.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-panel {
  width: min(100%, 420px);
  padding: 36px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
}
.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--color-surface);
  background: var(--brand);
  font-weight: 800;
}
.eyebrow {
  margin: 24px 0 4px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
}
h1 { margin: 0; font-size: 30px; letter-spacing: 0; }
.intro, .security-note { color: var(--muted); line-height: 1.5; }
form { display: grid; gap: 10px; margin-top: 26px; }
label { font-size: 14px; font-weight: 700; }
input {
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: 8px;
  color: var(--text);
  background: var(--color-surface);
  font: inherit;
}
input:focus-visible, button:focus-visible {
  outline: 3px solid var(--color-primary-focus);
  outline-offset: 2px;
}
button {
  min-height: 46px;
  margin-top: 8px;
  border: 0;
  border-radius: 8px;
  color: var(--color-surface);
  background: var(--brand);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
button:hover { background: var(--brand-hover); }
button:disabled { cursor: wait; opacity: 0.65; }
.error { margin: 4px 0 0; color: var(--danger); font-size: 14px; }
.security-note { margin: 22px 0 0; font-size: 12px; }
@media (max-width: 480px) {
  .login-shell { padding: 12px; }
  .login-panel { padding: 26px 20px; }
}