:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --surface: #fff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --blue: #007aff;
  --red: #c6262e;
  --red-soft: #fff1f2;
  --green: #248a3d;
  --green-soft: #edf8f0;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

.login-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 20px;
}

.login-card {
  width: min(460px, 100%);
  border: 1px solid #ececf0;
  border-radius: 10px;
  padding: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

h1 {
  margin: 0 0 10px;
  font-size: 34px;
  line-height: 1.08;
}

.subhead {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.login-form {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 7px;
}

label span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 14px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

button {
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 16px;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.main-button {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

.quiet-button {
  background: #fff;
  color: var(--ink);
}

.result {
  min-height: 22px;
  margin: 0;
  color: var(--muted);
  font-weight: 850;
  line-height: 1.45;
}

.result.error {
  color: var(--red);
}

.result.ok {
  color: var(--green);
}

.demo-note {
  display: grid;
  gap: 4px;
  margin-top: 18px;
  border: 1px solid #bfe8c8;
  border-radius: 8px;
  padding: 12px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 14px;
  line-height: 1.45;
}

.hidden {
  display: none;
}

input:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(0, 122, 255, 0.18);
  outline-offset: 2px;
}