:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1b1f24;
  --muted: #667085;
  --border: #d8dee7;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --danger: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101418;
    --panel: #171c22;
    --text: #eef2f6;
    --muted: #a3adba;
    --border: #2c3541;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
  padding: 24px;
}

main {
  width: min(460px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

h1 {
  margin: 0 0 6px;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: 0;
}

p { margin: 0; color: var(--muted); }

form {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

input,
button {
  min-height: 44px;
  border-radius: 7px;
  font: inherit;
}

input {
  width: 100%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 0 12px;
}

button {
  border: 0;
  background: var(--accent);
  color: #ffffff;
  font-weight: 650;
  padding: 0 16px;
  cursor: pointer;
}

button:hover { background: var(--accent-strong); }
button:disabled { cursor: default; opacity: 0.6; }

.message {
  margin-top: 14px;
  color: var(--muted);
}

.message.error { color: var(--danger); }