:root {
  --bg: #0b0e11;
  --panel: #12171c;
  --line: #24303a;
  --text: #d7e0e7;
  --muted: #7d8c98;
  --accent: #37c4b0;
  --accent-ink: #062521;
  --err: #ef6b6b;
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(900px 420px at 50% -10%, #16332f 0%, transparent 60%),
    var(--bg);
  color: var(--text);
}

body {
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 26px 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.logo-cai {
  height: 52px;
  width: auto;
  display: block;
}

h1 {
  margin: 22px 0 6px;
  font-size: 22px;
  font-weight: 650;
}

.lead {
  margin: 0 0 22px;
  color: var(--muted);
  line-height: 1.45;
  font-size: 14px;
}

form { display: grid; gap: 14px; }

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

input {
  font: inherit;
  letter-spacing: 0;
  text-transform: none;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 16px;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  margin-top: 4px;
  font: inherit;
  font-weight: 650;
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  padding: 11px 14px;
  cursor: pointer;
}

button:disabled { opacity: 0.6; cursor: wait; }

.error {
  margin: 0;
  color: var(--err);
  font-size: 14px;
  line-height: 1.4;
}

.note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}