:root {
  --bg: #14151a;
  --panel: #1c1e26;
  --line: #2c2f3a;
  --text: #e6e7ea;
  --muted: #8d919e;
  --accent: #4f9d7a;
  --err: #d16b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  padding: 1.5rem;
}

.portal {
  width: 100%;
  max-width: 22rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  padding: 2rem 1.75rem;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.sub {
  margin: 0.25rem 0 1.75rem;
  color: var(--muted);
  font-size: 0.875rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.8125rem;
  color: var(--muted);
  text-align: left;
}

input[type="text"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 1.375rem;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  letter-spacing: 0.35em;
  text-align: center;
  color: var(--text);
  background: #121319;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  width: 100%;
  margin-top: 1rem;
  padding: 0.7rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #0d1712;
  background: var(--accent);
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }

.err, .locked, .warn {
  margin: 0 0 1.25rem;
  padding: 0.6rem 0.75rem;
  font-size: 0.8125rem;
  border-radius: 0.4rem;
}

.err, .locked {
  color: var(--err);
  background: rgba(209, 107, 107, 0.1);
  border: 1px solid rgba(209, 107, 107, 0.25);
}

.warn {
  margin: 1rem 0 0;
  color: var(--muted);
  background: none;
  border: 0;
  padding: 0;
}