:root {
  --bg: #0f1420;
  --panel: #171e2e;
  --panel2: #1e2740;
  --line: #2a3550;
  --text: #e6ebf5;
  --muted: #8b96ad;
  --accent: #4f8cff;
  --ok: #2ecc71;
  --warn: #f5a623;
  --danger: #e74c3c;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Segoe UI", "Noto Sans Bengali", system-ui, sans-serif;
  font-size: 15px; line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: "JetBrains Mono", Consolas, monospace; font-size: 13px; background: rgba(255,255,255,.06); padding: 1px 5px; border-radius: 4px; }
h1 { font-size: 22px; margin: 0 0 18px; }
h2 { font-size: 16px; margin: 0 0 12px; color: var(--text); }

.sidebar {
  position: fixed; inset: 0 auto 0 0; width: 220px; background: var(--panel);
  border-right: 1px solid var(--line); padding: 18px 0; display: flex; flex-direction: column;
}
.sidebar .brand { font-size: 17px; font-weight: 700; padding: 0 18px 16px; border-bottom: 1px solid var(--line); }
.sidebar .logo { color: var(--accent); }
.sidebar nav { padding: 12px 8px; display: flex; flex-direction: column; gap: 2px; flex: 1; }
.sidebar nav a { color: var(--text); padding: 9px 12px; border-radius: 8px; }
.sidebar nav a:hover { background: var(--panel2); text-decoration: none; }
.sidebar nav a.active { background: var(--accent); color: #fff; }
.sidebar-footer { padding: 14px 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.sidebar-footer a { display: block; margin-top: 4px; }

main.with-sidebar { margin-left: 220px; padding: 26px 30px; }
main { padding: 26px 30px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.flash-ok { background: rgba(46,204,113,.12); border: 1px solid var(--ok); color: var(--ok); }
.flash-error { background: rgba(231,76,60,.12); border: 1px solid var(--danger); color: var(--danger); }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin-bottom: 18px; }
.card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.card-head h2 { margin: 0; }
.warn-card { border-color: var(--warn); }
.empty { color: var(--muted); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 18px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.stat .num { font-size: 26px; font-weight: 700; }
.stat.ok .num { color: var(--ok); } .stat.warn .num { color: var(--warn); } .stat.danger .num { color: var(--danger); }
.stat .lbl { color: var(--muted); font-size: 13px; }

table { width: 100%; border-collapse: collapse; }
th { text-align: left; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; padding: 8px 10px; border-bottom: 1px solid var(--line); }
td { padding: 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
tbody tr:hover { background: var(--panel2); }
table.kv td:first-child { color: var(--muted); width: 40%; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; background: var(--panel2); border: 1px solid var(--line); }
.badge.ok { color: var(--ok); border-color: var(--ok); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.danger { color: var(--danger); border-color: var(--danger); }
.pill { display: inline-block; background: var(--panel2); border: 1px solid var(--line); border-radius: 20px; padding: 2px 10px; margin: 2px 4px 2px 0; font-size: 13px; }

.btn { display: inline-block; background: var(--panel2); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 14px; }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-ok { color: var(--ok); border-color: var(--ok); }
.btn-warn { color: var(--warn); border-color: var(--warn); }
.btn-danger { color: var(--danger); border-color: var(--danger); }

form.stack { display: flex; flex-direction: column; gap: 12px; }
form.grid-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin: 0; }
legend { color: var(--muted); font-size: 13px; padding: 0 6px; }
fieldset.full { grid-column: 1 / -1; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
label input, label select, input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="date"], select {
  width: 100%; margin-top: 4px; background: var(--panel2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px; font-size: 14px;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }
.form-actions { display: flex; gap: 10px; }
.muted { color: var(--muted); font-size: 13px; }
.nowrap { white-space: nowrap; }
.code-block { background: #0b101a; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; overflow-x: auto; font-size: 13px; line-height: 1.6; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.inline-form { display: inline-flex; gap: 6px; align-items: center; }
.inline-form input { width: 220px; }

.page-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.page-head h1 { margin: 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: radial-gradient(1200px 600px at 50% -10%, #1b2a4a 0%, var(--bg) 60%); }
.login-card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 36px 34px; width: 360px; text-align: center; }
.login-logo { font-size: 40px; color: var(--accent); }
.login-card h1 { margin: 8px 0 2px; }
.login-card form { text-align: left; margin-top: 20px; }
.login-card .btn { width: 100%; }

@media (max-width: 900px) {
  .sidebar { position: static; width: 100%; }
  main.with-sidebar { margin-left: 0; }
  .stats, .grid-2, form.grid-form { grid-template-columns: 1fr; }
}