:root {
  --bg: #f7f7f3;
  --panel: #ffffff;
  --ink: #111111;
  --muted: #6b6b63;
  --line: #d9d9d0;
  --bad: #9f1239;
  --ok: #166534;
  --warn: #92400e;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.45 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, select, textarea { font: inherit; }
button {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
}
button.secondary { background: #fff; color: var(--ink); border-color: var(--line); }
button.danger { background: var(--bad); border-color: var(--bad); }
button:disabled { opacity: .55; cursor: not-allowed; }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 9px 10px;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 110px; resize: vertical; }
.shell { display: grid; grid-template-columns: 220px minmax(0,1fr) 330px; min-height: 100vh; }
.side { border-right: 1px solid var(--line); padding: 18px; background: #fff; }
.brand { font-weight: 700; font-size: 18px; margin-bottom: 28px; }
.nav-group { margin: 20px 0 8px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.nav button {
  width: 100%;
  display: flex;
  justify-content: space-between;
  background: transparent;
  color: var(--ink);
  border: 0;
  border-left: 2px solid transparent;
  border-radius: 0;
  padding: 8px 8px;
  text-align: left;
}
.nav button.active { border-left-color: var(--ink); font-weight: 600; }
.main { padding: 22px; min-width: 0; }
.preview { border-left: 1px solid var(--line); padding: 18px; background: #fff; }
.top { display:flex; justify-content:space-between; gap:16px; align-items:center; margin-bottom:18px; }
.title { font-size: 26px; font-weight: 700; margin: 0; }
.sub { color: var(--muted); margin: 4px 0 0; }
.grid { display:grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap:14px; }
.card { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); padding: 16px; }
.card h2 { margin: 0 0 12px; font-size: 16px; }
.row { display:flex; align-items:center; justify-content:space-between; gap:10px; padding: 9px 0; border-bottom: 1px solid var(--line); }
.row:last-child { border-bottom: 0; }
.muted { color: var(--muted); }
.pill { display:inline-flex; align-items:center; border:1px solid var(--line); border-radius:999px; padding:2px 8px; font-size:12px; color:var(--muted); }
.ok { color: var(--ok); }
.bad { color: var(--bad); }
.warn { color: var(--warn); }
.form { display:grid; gap:10px; }
.actions { display:flex; gap:8px; flex-wrap:wrap; margin-top:12px; }
.status { min-height: 20px; margin: 10px 0; color: var(--muted); }
.status.error { color: var(--bad); }
.status.success { color: var(--ok); }
.screen {
  width: 280px;
  height: 210px;
  border: 2px solid var(--ink);
  background: #fff;
  color: #000;
  padding: 12px;
  margin: 0 auto 14px;
  display:flex;
  flex-direction:column;
  gap:8px;
  overflow:hidden;
}
.screen-head,.screen-foot { display:flex; justify-content:space-between; border-bottom:1px solid #000; padding-bottom:3px; font-size:11px; font-weight:700; }
.screen-foot { border-bottom:0; border-top:1px solid #000; padding-top:3px; margin-top:auto; }
.screen-body { white-space:pre-wrap; font-size:13px; line-height:1.25; overflow:hidden; }
.slots { display:grid; grid-template-columns: repeat(5,1fr); gap:6px; }
.slot { border:1px solid var(--line); padding:8px 4px; text-align:center; border-radius:4px; font-size:12px; }
.table { width:100%; border-collapse: collapse; }
.table th,.table td { text-align:left; border-bottom:1px solid var(--line); padding:8px; vertical-align:top; }
.table th { color:var(--muted); font-weight:500; }
.login {
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:24px;
}
.login-card { max-width: 520px; border:1px solid var(--line); background:#fff; padding:28px; border-radius:6px; }
@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; }
  .side,.preview { border:0; }
  .grid { grid-template-columns: 1fr; }
}