:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #172033;
  --muted: #64748b;
  --line: #e2e8f0;
  --ok: #15803d;
  --ok-bg: #f0fdf4;
  --bad: #b91c1c;
  --bad-bg: #fef2f2;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
.app { min-height: 100vh; display: grid; grid-template-columns: 240px 1fr; }
.side { background: #fff; border-right: 1px solid var(--line); padding: 18px 14px; display: flex; flex-direction: column; gap: 14px; }
.brand { font-weight: 700; letter-spacing: -0.03em; }
.brand small { display: block; color: var(--muted); font-weight: 500; }
.nav { display: grid; gap: 4px; }
.nav a, .seat, .row-link { text-decoration: none; }
.nav a { padding: 10px 12px; border-radius: 10px; color: var(--muted); }
.nav a.active, .nav a:hover { background: #eef2ff; color: #1e293b; }
.note { color: var(--muted); font-size: 13px; line-height: 1.45; }
.logout { margin-top: auto; color: var(--muted); font-size: 13px; }
.main { padding: 22px 24px 40px; }
h1 { margin: 0 0 16px; font-size: 28px; }
h2 { margin: 18px 0 10px; font-size: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 14px; margin-bottom: 12px; }
.seats { display: grid; grid-template-columns: repeat(auto-fill, minmax(72px, 1fr)); gap: 8px; }
.seat {
  aspect-ratio: 1;
  border: 1px solid #86efac;
  background: var(--ok-bg);
  color: var(--ok);
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 18px;
  padding: 6px;
  text-align: center;
}
.seat.bad { border-color: #fca5a5; background: var(--bad-bg); color: var(--bad); }
.seat small { display: block; font-size: 11px; font-weight: 500; }
.stack { display: grid; gap: 8px; }
.row-link, .issue { display: flex; justify-content: space-between; gap: 8px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.muted { color: var(--muted); }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
input, select, textarea { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: #fff; }
textarea { min-height: 88px; }
.inline { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.btn { border: 0; border-radius: 10px; padding: 10px 14px; background: #e2e8f0; cursor: pointer; }
.btn-primary { background: #2563eb; color: #fff; }
.pill { border-radius: 999px; padding: 3px 8px; font-size: 12px; font-weight: 700; }
.pill.new { background: #dbeafe; color: #1d4ed8; }
.pill.progress { background: #fef3c7; color: #92400e; }
.pill.closed { background: #dcfce7; color: #166534; }
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login form { width: min(420px, 100%); background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 22px; display: grid; gap: 12px; }
.login .muted { text-align: center; font-size: 13px; }
.error { color: var(--bad); margin: 0; }
ol { margin: 6px 0 0; padding-left: 18px; color: #334155; }
table { width: 100%; border-collapse: collapse; }
td, th { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
@media (max-width: 860px) { .app { grid-template-columns: 1fr; } }