/* ============================================================
   Theme tokens
   ============================================================ */
:root,
[data-theme="light"] {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --text-2: #374151;
  --muted: #6b7280;
  --faint: #9ca3af;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --on-primary: #ffffff;

  --success: #16a34a;
  --success-soft: #ecfdf5;
  --success-text: #166534;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --danger-text: #991b1b;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --warning-text: #92400e;
  --info-soft: #eff6ff;
  --info-text: #1e40af;

  --sidebar-bg: #ffffff;
  --sidebar-border: #e5e7eb;
  --sidebar-item: #4b5563;
  --sidebar-item-hover-bg: #f3f4f6;
  --sidebar-active-bg: #eff6ff;
  --sidebar-active-text: #2563eb;

  --row-error-bg: #fef2f2;
  --row-success-bg: #f0fdf4;

  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 10px 30px rgba(16, 24, 40, 0.12);
  --shadow-modal: 0 24px 60px rgba(16, 24, 40, 0.28);

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #111827;
  --surface-2: #0f172a;
  --surface-3: #1e293b;
  --border: #1f2937;
  --border-strong: #334155;
  --text: #f1f5f9;
  --text-2: #cbd5e1;
  --muted: #94a3b8;
  --faint: #64748b;

  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-soft: #1e293b;
  --on-primary: #ffffff;

  --success: #22c55e;
  --success-soft: #052e1a;
  --success-text: #4ade80;
  --danger: #ef4444;
  --danger-soft: #2a0f12;
  --danger-text: #fca5a5;
  --warning: #f59e0b;
  --warning-soft: #2a1e05;
  --warning-text: #fcd34d;
  --info-soft: #11213f;
  --info-text: #93c5fd;

  --sidebar-bg: #0f172a;
  --sidebar-border: #1f2937;
  --sidebar-item: #94a3b8;
  --sidebar-item-hover-bg: #1e293b;
  --sidebar-active-bg: #1e293b;
  --sidebar-active-text: #60a5fa;

  --row-error-bg: #2a0f12;
  --row-success-bg: #052e1a;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6);
  --shadow-modal: 0 24px 60px rgba(0, 0, 0, 0.7);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s, color 0.2s;
}

/* ============================================================
   Login
   ============================================================ */
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--bg);
  padding: 24px;
}
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  width: 100%;
  max-width: 380px;
}
.login-card h1 { margin: 0 0 4px; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.login-card .sub { color: var(--muted); margin: 0 0 26px; font-size: 13.5px; }
.login-foot { margin-top: 22px; text-align: center; color: var(--faint); font-size: 12px; }

.brand {
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 20px;
}
.brand-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--primary); color: var(--on-primary);
  font-weight: 700; font-size: 15px; letter-spacing: -0.02em;
}
.brand-name { font-weight: 700; font-size: 15px; }

/* ============================================================
   Form controls
   ============================================================ */
label {
  display: block; font-size: 13px; font-weight: 600;
  margin-bottom: 6px; color: var(--text-2);
}
input, select, textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input::placeholder, textarea::placeholder { color: var(--faint); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent);
}
textarea { resize: vertical; min-height: 78px; }
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  padding-right: 30px;
}
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 15px;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  background: var(--primary); color: var(--on-primary);
  font-size: 13.5px; font-weight: 600; cursor: pointer;
  font-family: inherit; white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}
.btn:hover { background: var(--primary-hover); }
.btn:disabled { opacity: 0.6; cursor: default; }
.btn.full { width: 100%; }
.btn.secondary {
  background: var(--surface); color: var(--text-2); border-color: var(--border-strong);
}
.btn.secondary:hover { background: var(--surface-3); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b91c1c; }
.btn.ghost { background: transparent; color: var(--muted); border-color: transparent; }
.btn.ghost:hover { background: var(--surface-3); color: var(--text); }
.btn.sm { padding: 6px 11px; font-size: 12.5px; }
.btn.icon { padding: 7px; width: 32px; height: 32px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 7px;
  border: 1px solid transparent; background: transparent;
  color: var(--muted); cursor: pointer; transition: background 0.15s, color 0.15s;
}
.icon-btn:hover { background: var(--surface-3); color: var(--text); }
.icon-btn.danger:hover { background: var(--danger-soft); color: var(--danger); }

.alert { padding: 10px 12px; border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 16px; }
.alert.error { background: var(--danger-soft); color: var(--danger-text); border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent); }
.alert.ok { background: var(--success-soft); color: var(--success-text); border: 1px solid color-mix(in srgb, var(--success) 30%, transparent); }

/* ============================================================
   App shell
   ============================================================ */
.shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex; flex-direction: column;
  padding: 16px 12px;
  position: sticky; top: 0; height: 100vh;
}
.sidebar .brand { padding: 6px 8px 18px; margin: 0; }
.nav-group-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--faint); padding: 6px 10px; margin-top: 6px;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 9px 10px; border-radius: var(--radius-sm);
  color: var(--sidebar-item); cursor: pointer; font-size: 14px; font-weight: 500;
  margin-bottom: 2px; border: none; background: none; width: 100%; text-align: left;
  font-family: inherit; transition: background 0.12s, color 0.12s;
}
.nav-item:hover { background: var(--sidebar-item-hover-bg); color: var(--text); }
.nav-item.active { background: var(--sidebar-active-bg); color: var(--sidebar-active-text); font-weight: 600; }
.nav-item .ic { width: 18px; height: 18px; flex-shrink: 0; }
.sidebar .spacer { flex: 1; }

.user-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); margin-bottom: 10px;
}
.user-card .meta { overflow: hidden; }
.user-card .meta .n { font-weight: 600; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-card .meta .r { color: var(--muted); font-size: 11.5px; }

.theme-toggle {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); margin-bottom: 8px;
}
.theme-toggle .lbl { display: flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 500; color: var(--text-2); }
.switch { position: relative; width: 42px; height: 24px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider {
  position: absolute; inset: 0; cursor: pointer;
  background: var(--border-strong); border-radius: 999px; transition: background 0.2s;
}
.switch .slider::before {
  content: ""; position: absolute; height: 18px; width: 18px; left: 3px; top: 3px;
  background: #fff; border-radius: 50%; transition: transform 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.3);
}
.switch input:checked + .slider { background: var(--primary); }
.switch input:checked + .slider::before { transform: translateX(18px); }

/* ---- Main ---- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 28px; background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.topbar .crumbs { font-size: 12.5px; color: var(--muted); }
.topbar .crumbs b { color: var(--text); font-weight: 600; }
.topbar .right { display: flex; align-items: center; gap: 10px; }
.content { padding: 28px; max-width: 1200px; width: 100%; }

.page-head { margin-bottom: 22px; }
.page-head h1 { margin: 0 0 4px; font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.page-head p { margin: 0; color: var(--muted); font-size: 13.5px; }

/* ============================================================
   Stats
   ============================================================ */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 22px; }
.stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow-sm);
}
.stat .lbl { color: var(--muted); font-size: 12.5px; font-weight: 500; display: flex; align-items: center; gap: 7px; }
.stat .num { font-size: 26px; font-weight: 700; margin-top: 8px; letter-spacing: -0.02em; }
.stat .ic { color: var(--primary); }

/* ============================================================
   Cards (engineers)
   ============================================================ */
.section-title { display: flex; align-items: center; justify-content: space-between; margin: 26px 0 14px; }
.section-title h2 { margin: 0; font-size: 15px; font-weight: 700; }
.section-title .hint { color: var(--muted); font-size: 12.5px; }

.grid.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }

.eng-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; cursor: pointer; box-shadow: var(--shadow-sm);
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
  display: flex; flex-direction: column; gap: 12px;
}
.eng-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.eng-card .top { display: flex; align-items: center; gap: 12px; }
.avatar {
  width: 42px; height: 42px; border-radius: 50%; flex-shrink: 0;
  color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 15px;
}
.avatar.sm { width: 30px; height: 30px; font-size: 12px; }
.eng-card .name { font-weight: 600; font-size: 14.5px; }
.eng-card .role { color: var(--muted); font-size: 12px; }
.eng-card .cta { display: flex; align-items: center; gap: 6px; color: var(--primary); font-size: 12.5px; font-weight: 600; }

/* ============================================================
   Panels & tables
   ============================================================ */
.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); overflow: hidden; margin-bottom: 20px;
}
.panel-head {
  padding: 14px 18px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.panel-head h3 { margin: 0; font-size: 14.5px; font-weight: 700; }
.panel-head .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th {
  background: var(--surface-2); font-weight: 600; color: var(--muted);
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--surface-2); }
td .cell-strong { font-weight: 600; }
.empty { padding: 48px 20px; text-align: center; color: var(--muted); }
.empty .big { font-size: 15px; font-weight: 600; color: var(--text-2); margin-bottom: 4px; }

.eng-cell { display: flex; align-items: center; gap: 10px; }
.eng-cell .name { font-weight: 600; }

/* ============================================================
   Badges
   ============================================================ */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 600; white-space: nowrap;
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge.blue { background: var(--info-soft); color: var(--info-text); }
.badge.green { background: var(--success-soft); color: var(--success-text); }
.badge.red { background: var(--danger-soft); color: var(--danger-text); }
.badge.amber { background: var(--warning-soft); color: var(--warning-text); }
.badge.gray { background: var(--surface-3); color: var(--muted); }
.badge.contrib { background: var(--primary-soft); color: var(--primary); min-width: 30px; justify-content: center; }

/* ============================================================
   Toolbar / filters
   ============================================================ */
.toolbar { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 18px; }
.toolbar .fld { display: flex; flex-direction: column; }
.toolbar .fld label { font-size: 11.5px; margin-bottom: 5px; }
.toolbar .fld input, .toolbar .fld select { min-width: 170px; }
.toolbar .grow { flex: 1; }
.search { position: relative; }
.search input { padding-left: 32px; min-width: 220px; }
.search .ic { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--faint); pointer-events: none; }

/* ============================================================
   Modal
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.55);
  display: none; place-items: center; z-index: 50; padding: 24px;
  backdrop-filter: blur(2px);
}
.modal-overlay.open { display: grid; }
.modal {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); width: 100%; max-width: 520px;
  box-shadow: var(--shadow-modal); max-height: 90vh; overflow: auto;
}
.modal-head {
  padding: 18px 20px 14px; display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
}
.modal-head h3 { margin: 0; font-size: 16px; font-weight: 700; }
.modal-head .sub { color: var(--muted); font-size: 12.5px; margin-top: 3px; }
.modal-body { padding: 4px 20px 20px; }
.modal-foot { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }
.close-x { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--muted); line-height: 1; padding: 2px 6px; border-radius: 6px; }
.close-x:hover { background: var(--surface-3); color: var(--text); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.entry-engineer {
  display: flex; align-items: center; gap: 11px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 11px 13px; margin-bottom: 18px;
}
.entry-engineer .name { font-weight: 600; }
.entry-engineer .role { color: var(--muted); font-size: 12px; }

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 100;
  background: var(--text); color: var(--surface); padding: 12px 18px; border-radius: 10px;
  box-shadow: var(--shadow-lg); font-size: 14px; font-weight: 500; opacity: 0;
  transform: translateY(10px); transition: opacity 0.2s, transform 0.2s; pointer-events: none;
  display: flex; align-items: center; gap: 9px; max-width: 360px;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.err { background: var(--danger); color: #fff; }
.toast.ok { background: var(--success); color: #fff; }

/* ============================================================
   Utilities
   ============================================================ */
.muted { color: var(--muted); }
.text-right { text-align: right; }
.mono { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; color: var(--muted); font-size: 12.5px; white-space: nowrap; }
.nowrap { white-space: nowrap; }
.row-actions { display: flex; gap: 4px; justify-content: flex-end; }
.page { display: none; }
.page.active { display: block; }
.notes-cell { max-width: 320px; }
.tr-error { background: var(--row-error-bg); }
.tr-success td:first-child { box-shadow: inset 3px 0 0 var(--success); }
.tr-error td:first-child { box-shadow: inset 3px 0 0 var(--danger); }

@media (max-width: 720px) {
  .sidebar { position: fixed; z-index: 30; transform: translateX(-100%); transition: transform 0.2s; }
  .sidebar.open { transform: translateX(0); }
  .content { padding: 18px; }
  .form-row { grid-template-columns: 1fr; }
}

/* ============================================================
   Searchable combobox (BMC Category)
   ============================================================ */
.combobox { position: relative; }
.combo-input { padding-right: 32px; }
.combo-toggle {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  width: 24px; height: 24px; display: grid; place-items: center;
  background: none; border: none; color: var(--muted); cursor: pointer; border-radius: 6px;
}
.combo-toggle:hover { background: var(--surface-3); color: var(--text); }
.combo-list {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 20;
  background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); box-shadow: var(--shadow-lg);
  max-height: 240px; overflow-y: auto; display: none; padding: 4px;
}
.combo-list.open { display: block; }
.combo-option {
  padding: 9px 11px; border-radius: 6px; cursor: pointer; font-size: 13.5px;
  color: var(--text-2); line-height: 1.35;
}
.combo-option:hover, .combo-option.active { background: var(--primary-soft); color: var(--text); }
.combo-option mark { background: color-mix(in srgb, var(--primary) 30%, transparent); color: inherit; padding: 0 1px; border-radius: 3px; }
.combo-empty { padding: 12px; text-align: center; color: var(--muted); font-size: 13px; }