:root {
  --primary: #d6482b;
  --dark: #1f2430;
  --dark2: #262c3b;
  --bg: #f5f6f8;
  --border: #e0e2e7;
  --sidebar-w: 210px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif; background: var(--bg); color: #222; }

/* ---------- app shell / sidebar ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--dark);
  color: #cfd3dc;
  display: flex;
  flex-direction: column;
  padding: 14px 10px;
  flex-shrink: 0;
}
.brand { color: #fff; font-weight: 700; font-size: 16px; padding: 10px 10px 18px; display: flex; gap: 8px; align-items: center; }
.sidebar .nav-btn {
  display: flex; align-items: center; gap: 10px;
  background: transparent; border: none; color: #cfd3dc;
  padding: 11px 12px; border-radius: 8px; cursor: pointer;
  font-size: 14px; text-align: left; margin-bottom: 4px;
}
.sidebar .nav-btn:hover { background: var(--dark2); }
.sidebar .nav-btn.active { background: var(--primary); color: #fff; }
.sidebar .logout-btn { margin-top: auto; color: #f0a898; }
.sidebar .icon { font-size: 16px; }

main { flex: 1; padding: 22px 26px; max-width: 1100px; }

.bottom-nav { display: none; }

/* ---------- tabs ---------- */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- dashboard ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 14px; margin-bottom: 20px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.card .value { font-size: 26px; font-weight: 700; color: var(--dark); }
.card .label { font-size: 13px; color: #777; margin-top: 4px; }
.card.warn .value { color: var(--primary); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } }
.panel { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.panel h3 { margin-top: 0; font-size: 15px; }

/* ---------- toolbar / tables ---------- */
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.toolbar input[type=text] { padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; min-width: 240px; }

table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: #fafafa; font-weight: 600; color: #555; }
tr:last-child td { border-bottom: none; }
.low { color: var(--primary); font-weight: 600; }

.btn-primary { background: var(--primary); color: #fff; border: none; padding: 8px 16px; border-radius: 6px; cursor: pointer; font-size: 14px; }
.btn-secondary { background: #eee; border: none; padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; margin-right: 4px; }
.btn-danger { background: #fde8e5; color: var(--primary); border: none; padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; }

/* ---------- modal ---------- */
#modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center; z-index: 50; }
#modal-overlay.hidden { display: none; }
#modal-box { background: #fff; border-radius: 10px; padding: 22px; width: 480px; max-width: 92vw; max-height: 88vh; overflow-y: auto; }
#modal-box h3 { margin-top: 0; }
#modal-box label { display: block; margin: 10px 0 4px; font-size: 13px; color: #555; }
#modal-box input, #modal-box select, #modal-box textarea { width: 100%; padding: 8px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
#modal-box .modal-actions { margin-top: 18px; display: flex; justify-content: flex-end; gap: 10px; }
.item-row { display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 8px; align-items: center; margin-bottom: 6px; }

/* ---------- login page ---------- */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--dark); }
.login-card { background: #fff; border-radius: 12px; padding: 32px 28px; width: 340px; max-width: 90vw; }
.login-card h1 { margin: 0 0 2px; font-size: 20px; }
.login-sub { color: #888; margin: 0 0 18px; font-size: 14px; }
.login-card label { display: block; margin: 12px 0 4px; font-size: 13px; color: #555; }
.login-card input { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
.login-error { color: var(--primary); font-size: 13px; margin: 10px 0 0; }
.login-error.hidden { display: none; }
.login-hint { color: #999; font-size: 12px; margin-top: 16px; text-align: center; }

/* ---------- mobile: sidebar becomes bottom nav ---------- */
@media (max-width: 760px) {
  .app-shell { flex-direction: column; }
  .sidebar { display: none; }
  main { padding: 16px; padding-bottom: 84px; max-width: 100%; }
  .bottom-nav {
    display: flex;
    position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--dark);
    justify-content: space-around;
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
    z-index: 40;
  }
  .bottom-nav .nav-btn {
    flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
    background: transparent; border: none; color: #9099ab;
    padding: 6px 2px; cursor: pointer; font-size: 10px; border-radius: 8px;
  }
  .bottom-nav .nav-btn.active { color: #fff; }
  .bottom-nav .icon { font-size: 18px; }
  .two-col { grid-template-columns: 1fr; }
  #modal-box { width: 92vw; }
}