:root {
  color-scheme: light dark;
  --bg: #0f1419;
  --surface: #1a222d;
  --border: #2d3a4a;
  --text: #e8eef4;
  --muted: #9aa8b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --error-bg: #3f1d24;
  --error-text: #fecaca;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 50% -20%, #1e3a5f 0%, var(--bg) 55%);
  color: var(--text);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.card {
  width: min(100%, 22rem);
  padding: 2rem 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 24px 48px rgb(0 0 0 / 35%);
}

.brand__eyebrow {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand h1 {
  margin: 0.25rem 0 0;
  font-size: 1.75rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.brand__lead {
  margin: 0.5rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.field input {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

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

.btn {
  margin-top: 0.25rem;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn:disabled {
  opacity: 0.65;
  cursor: wait;
}

.error {
  margin: 0 0 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  background: var(--error-bg);
  color: var(--error-text);
  font-size: 0.9rem;
  line-height: 1.4;
}

.error[hidden] {
  display: none;
}