:root {
  --bg: #0b1220;
  --panel: #111a2e;
  --panel-2: #1a2540;
  --border: #243154;
  --text: #e6edf7;
  --muted: #8b97b0;
  --accent: #6c8cff;
  --blue: #3498db;
  --green: #2ecc71;
  --yellow: #f1c40f;
  --red: #e74c3c;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: -apple-system, "Segoe UI", system-ui, sans-serif; font-size: 14px; }
button { background: var(--accent); color: #fff; border: none; padding: 8px 14px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500; }
button:hover { opacity: 0.9; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.secondary { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
input, textarea {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 12px; font-size: 13px; font-family: inherit;
}
textarea { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; resize: vertical; }

.login { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-box { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 30px 40px; max-width: 380px; width: 100%; }
.login-box h1 { margin: 0 0 8px; font-size: 22px; }
.login-box p { color: var(--muted); margin: 0 0 16px; font-size: 13px; }
.login-box input { width: 100%; margin-bottom: 12px; }
.login-box button { width: 100%; }
.login-box .err { color: var(--red); font-size: 12px; margin-top: 8px; }

header { display: flex; align-items: center; gap: 12px; padding: 14px 24px; border-bottom: 1px solid var(--border); background: var(--panel); flex-wrap: wrap; }
header h1 { margin: 0; font-size: 18px; font-weight: 600; }

.tabs { display: flex; gap: 4px; padding: 0 24px; border-bottom: 1px solid var(--border); background: var(--panel); }
.tab { background: transparent; color: var(--muted); border: none; padding: 12px 18px; cursor: pointer; font-size: 13px; font-weight: 500; border-bottom: 2px solid transparent; border-radius: 0; }
.tab:hover { color: var(--text); background: transparent; }
.tab.active { color: var(--text); border-bottom-color: var(--blue); }
[data-tab-content] { display: none; }
[data-tab-content].active { display: block; }

main { padding: 12px 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; margin: 12px 24px; overflow: hidden; }
.card-header { padding: 12px 16px; border-bottom: 1px solid var(--border); background: rgba(255,255,255,0.02); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.info { padding: 10px 16px; background: rgba(52, 152, 219, 0.06); border-bottom: 1px solid var(--border); font-size: 12px; color: var(--muted); }
.pill { display: inline-flex; padding: 2px 8px; border-radius: 12px; font-size: 11px; background: var(--panel-2); color: var(--muted); }
.pill.green { background: rgba(46, 204, 113, 0.15); color: var(--green); }
.pill.yellow { background: rgba(241, 196, 15, 0.15); color: var(--yellow); }
.pill.red { background: rgba(231, 76, 60, 0.15); color: var(--red); }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 8px 14px; border-bottom: 1px solid var(--border); }
th { background: rgba(255,255,255,0.02); color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: 11px; letter-spacing: 0.4px; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--panel-2); }
td.id { font-family: ui-monospace, Menlo, Consolas, monospace; color: var(--muted); }
.empty { text-align: center; padding: 30px; color: var(--muted); font-style: italic; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 16px; }
.grid2 h3 { margin: 0 0 6px; font-size: 13px; }
.grid2 textarea { width: 100%; min-height: 200px; }

.log {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--panel); border-top: 1px solid var(--border);
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px;
  padding: 8px 24px; max-height: 100px; overflow-y: auto; color: var(--muted);
}
.log .ok { color: var(--green); }
.log .err { color: var(--red); }
.log .warn { color: var(--yellow); }

/* Nhóm leader */
.group-block { border: 1px solid var(--border); border-radius: 10px; margin: 12px 16px; overflow: hidden; }
.group-head { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: var(--panel-2); flex-wrap: wrap; }
.group-head .grp-code { font-family: ui-monospace, Menlo, Consolas, monospace; font-weight: 600; letter-spacing: 1px; width: 160px; }
.grp-regions { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; padding: 12px 14px; }
.grp-region { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; user-select: none; font-size: 13px; }
.grp-region input { width: 16px; height: 16px; accent-color: var(--green); }
.grp-region.checked { border-color: var(--green); background: rgba(46,204,113,0.10); }
.grp-region.taken { opacity: 0.4; cursor: not-allowed; }
.grp-region .taken-by { font-size: 10px; color: var(--yellow); margin-left: auto; }