:root {
  --ground: #f1f1ef;
  --surface: #ffffff;
  --border: #e3e3df;
  --text: #131416;
  --muted: #5d5f60;
  --accent: #1b6c80;
  --negative: #c4242a;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font: 400 15px/1.5 "IBM Plex Sans", Inter, system-ui, sans-serif;
  display: grid;
  place-items: center;
  padding: 24px;
}
.sheet {
  width: min(960px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  min-height: 520px;
}
.sheet .left { padding: 48px; display: flex; flex-direction: column; justify-content: space-between; }
.sheet .right { background: #fbfaf7; border-left: 1px solid var(--border); position: relative; }
.sheet .right svg { position: absolute; inset: 0; width: 100%; height: 100%; }
h1 { font-size: 28px; font-weight: 600; margin: 0 0 8px; letter-spacing: -0.01em; }
p { margin: 0; color: var(--muted); max-width: 36ch; }
form { margin-top: 40px; display: grid; gap: 8px; max-width: 320px; }
label { font-weight: 500; font-size: 14px; }
input[type=password] {
  height: 44px; border: 1px solid #cdced1; border-radius: 8px; padding: 0 12px;
  font: inherit; font-family: "IBM Plex Mono", ui-monospace, monospace; letter-spacing: 0.08em; width: 100%;
}
input[type=password]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
button {
  height: 44px; border: 0; border-radius: 8px; background: #131416; color: #fff;
  font: 500 15px "IBM Plex Sans", Inter, system-ui, sans-serif; cursor: pointer; margin-top: 8px;
}
button:hover { background: #2a2b2e; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.error { color: var(--negative); min-height: 1.5em; font-size: 14px; }
.foot { color: var(--muted); font-size: 13px; }
@media (max-width: 720px) {
  .sheet { grid-template-columns: 1fr; min-height: 0; }
  .sheet .right { display: none; }
  .sheet .left { padding: 32px 24px; }
}