:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c232c;
  --line: #2a323d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #3b82f6;
  --red: #ef4444;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.55 ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;
}

.box {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
}

h1 { margin: 0; font-size: 20px; font-weight: 650; letter-spacing: -0.01em; }
h1 span { color: var(--muted); font-weight: 400; }
.sub { margin: 4px 0 26px; color: var(--muted); font-size: 13px; }

label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 6px;
}

input {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
}
input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}

button {
  width: 100%;
  margin-top: 14px;
  font: inherit;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button:hover:not(:disabled) { filter: brightness(1.08); }
button:disabled { opacity: 0.55; cursor: progress; }

.err {
  margin: 16px 0 0;
  padding: 10px 12px;
  border-radius: 7px;
  font-size: 13px;
  color: var(--red);
  background: color-mix(in srgb, var(--red) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--red) 45%, transparent);
}

.note { margin: 22px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
code {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 11px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
}