/* ============================================================
   GIA ADMIN PANEL — Stylesheet
   ============================================================ */

:root {
  --navy:      #0d1b3e;
  --navy-mid:  #162447;
  --navy-lt:   #1e3a6e;
  --gold:      #f5a623;
  --gold-dk:   #d4891a;
  --white:     #ffffff;
  --bg:        #f0f2f7;
  --surface:   #ffffff;
  --border:    #e2e8f0;
  --text:      #1e293b;
  --muted:     #64748b;
  --success:   #22c55e;
  --warning:   #f59e0b;
  --danger:    #ef4444;
  --info:      #3b82f6;
  --sidebar-w: 260px;
  --topnav-h:  60px;
  --shadow:    0 2px 12px rgba(13,27,62,.10);
  --shadow-lg: 0 8px 32px rgba(13,27,62,.18);
  --radius:    10px;
  --t:         .25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select {
  font-family: inherit; font-size: .9rem;
  border: 1.5px solid var(--border); border-radius: 7px;
  padding: 9px 13px; width: 100%; outline: none; background: var(--white);
  transition: var(--t);
}
input:focus, textarea:focus, select:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(245,166,35,.15);
}
textarea { resize: vertical; }

/* ============================================================
   LOGIN SCREEN
   ============================================================ */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%); }

.login-screen {
  width: 100%;
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.login-card {
  background: var(--white);
  border-radius: 18px;
  padding: 48px 44px;
  width: 100%; max-width: 440px;
  box-shadow: var(--shadow-lg);
}
.login-logo {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 32px;
}
.login-logo img { height: 52px; width: 52px; border-radius: 50%; border: 2px solid var(--gold); object-fit: contain; }
.login-brand { display: block; font-weight: 800; font-size: 1rem; color: var(--navy); line-height: 1.2; }
.login-sub { display: block; font-size: .75rem; color: var(--gold); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }
.login-card h2 { font-size: 1.6rem; color: var(--navy); margin-bottom: 6px; }
.login-hint { color: var(--muted); font-size: .88rem; margin-bottom: 28px; }

.field { margin-bottom: 18px; }
.field label { display: flex; align-items: center; gap: 7px; font-size: .82rem; font-weight: 600; color: var(--navy); margin-bottom: 6px; }
.field label i { color: var(--gold); }

.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 44px; }
.pw-toggle {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--muted); font-size: .95rem;
  transition: var(--t);
}
.pw-toggle:hover { color: var(--gold); }

.login-error { color: var(--danger); font-size: .85rem; margin-bottom: 12px; min-height: 18px; }

.btn-login-submit {
  width: 100%; padding: 13px;
  background: var(--navy);
  color: var(--white); font-weight: 700; font-size: .95rem;
  border: none; border-radius: 8px;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  transition: var(--t);
}
.btn-login-submit:hover { background: var(--gold); color: var(--navy); }

.back-to-site { display: inline-flex; align-items: center; gap: 7px; margin-top: 20px; font-size: .85rem; color: var(--muted); transition: var(--t); }
.back-to-site:hover { color: var(--gold); }

/* ============================================================
   LAYOUT
   ============================================================ */
#adminApp { display: flex; min-height: 100vh; }

/* SIDEBAR */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; height: 100vh; z-index: 200;
  overflow-y: auto; overflow-x: hidden;
  transition: transform var(--t);
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.15) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,.15); border-radius: 4px; }

.sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  padding: 18px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  flex-shrink: 0;
}
.sidebar-brand img { height: 34px; width: 34px; border-radius: 50%; border: 2px solid var(--gold); object-fit: contain; }
.sidebar-brand span { font-weight: 700; font-size: .95rem; color: var(--white); flex: 1; }
.sidebar-close { display: none; background: none; border: none; color: rgba(255,255,255,.5); font-size: 1.1rem; }

.sidebar-nav { flex: 1; padding: 12px 0; }
.nav-group { margin-bottom: 8px; }
.nav-label {
  display: block; font-size: .68rem; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: rgba(255,255,255,.35);
  padding: 10px 20px 4px;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 20px; font-size: .875rem; color: rgba(255,255,255,.65);
  border-left: 3px solid transparent; transition: var(--t);
}
.nav-item i { width: 16px; text-align: center; flex-shrink: 0; }
.nav-item:hover { background: rgba(255,255,255,.07); color: var(--white); }
.nav-item.active { background: rgba(245,166,35,.12); color: var(--gold); border-left-color: var(--gold); }

.sidebar-footer {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 16px 20px;
  flex-shrink: 0;
}
.admin-info { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.admin-avatar { width: 34px; height: 34px; border-radius: 50%; background: rgba(255,255,255,.12); display: flex; align-items: center; justify-content: center; color: var(--gold); font-size: 1.1rem; flex-shrink: 0; }
.admin-name { display: block; font-size: .85rem; font-weight: 600; color: var(--white); }
.admin-role { display: block; font-size: .72rem; color: rgba(255,255,255,.45); }
.btn-signout {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 9px 12px; border-radius: 7px;
  background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.25);
  color: #fca5a5; font-size: .82rem; font-weight: 600; transition: var(--t);
}
.btn-signout:hover { background: rgba(239,68,68,.25); }

/* MAIN WRAP */
.main-wrap {
  flex: 1;
  margin-left: var(--sidebar-w);
  display: flex; flex-direction: column;
  min-height: 100vh;
}

.topnav {
  position: sticky; top: 0; z-index: 100;
  height: var(--topnav-h);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 16px;
  padding: 0 24px;
  box-shadow: var(--shadow);
}
.menu-toggle { display: none; background: none; border: none; font-size: 1.2rem; color: var(--navy); }
.topnav-title { font-weight: 700; font-size: 1.05rem; color: var(--navy); flex: 1; }
.topnav-actions { display: flex; gap: 8px; }
.btn-icon {
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--bg); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); transition: var(--t);
}
.btn-icon:hover { background: var(--navy); color: var(--gold); border-color: var(--navy); }

.panel-area { flex: 1; padding: 28px; }

/* PANELS */
.panel { display: none; }
.panel.active { display: block; animation: fadeIn .25s ease; }
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }

.panel-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.panel-header h2 { font-size: 1.4rem; color: var(--navy); }
.panel-header p { color: var(--muted); font-size: .88rem; margin-top: 2px; }
.panel-desc { color: var(--muted); font-size: .88rem; margin-bottom: 24px; }

/* ============================================================
   DASHBOARD
   ============================================================ */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 32px; }
.dash-stat {
  background: var(--surface); border-radius: var(--radius);
  padding: 22px; display: flex; align-items: center; gap: 16px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: var(--t);
}
.dash-stat:hover { box-shadow: var(--shadow-lg); }
.dash-stat > i { font-size: 1.8rem; color: var(--gold); }
.dash-stat span { display: block; font-size: 1.7rem; font-weight: 800; color: var(--navy); line-height: 1; }
.dash-stat p { font-size: .8rem; color: var(--muted); margin-top: 3px; }

.dash-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dash-card {
  background: var(--surface); border-radius: var(--radius); padding: 24px;
  border: 1.5px solid var(--border); cursor: pointer; transition: var(--t);
  display: flex; flex-direction: column; gap: 8px;
}
.dash-card:hover { border-color: var(--gold); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.dash-card > i { font-size: 1.6rem; color: var(--gold); }
.dash-card h4 { font-size: .95rem; color: var(--navy); font-weight: 700; }
.dash-card p { font-size: .82rem; color: var(--muted); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-add {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--navy); color: var(--white);
  font-size: .85rem; font-weight: 600; padding: 9px 18px;
  border-radius: 7px; border: none; transition: var(--t);
}
.btn-add:hover { background: var(--gold); color: var(--navy); }

.btn-save {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--gold); color: var(--navy);
  font-size: .9rem; font-weight: 700; padding: 11px 24px;
  border-radius: 7px; border: none; transition: var(--t);
}
.btn-save:hover { background: var(--gold-dk); }

.btn-sm {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .78rem; font-weight: 600; padding: 5px 12px;
  border-radius: 5px; border: none; transition: var(--t);
}
.btn-edit { background: rgba(59,130,246,.12); color: var(--info); }
.btn-edit:hover { background: var(--info); color: var(--white); }
.btn-delete { background: rgba(239,68,68,.12); color: var(--danger); }
.btn-delete:hover { background: var(--danger); color: var(--white); }
.btn-toggle { background: rgba(34,197,94,.12); color: var(--success); }
.btn-toggle:hover { background: var(--success); color: var(--white); }
.btn-view { background: rgba(245,166,35,.12); color: var(--gold-dk); }
.btn-view:hover { background: var(--gold); color: var(--navy); }

/* ============================================================
   TABLES
   ============================================================ */
.table-wrap { overflow-x: auto; background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border); }

table { width: 100%; border-collapse: collapse; }
thead tr { background: var(--navy); }
thead th { padding: 12px 16px; font-size: .78rem; font-weight: 700; color: rgba(255,255,255,.75); text-align: left; text-transform: uppercase; letter-spacing: .5px; white-space: nowrap; }
tbody tr { border-bottom: 1px solid var(--border); transition: var(--t); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: rgba(245,166,35,.04); }
tbody td { padding: 12px 16px; font-size: .875rem; vertical-align: middle; }

.badge {
  display: inline-flex; align-items: center;
  font-size: .72rem; font-weight: 700; letter-spacing: .3px;
  padding: 3px 10px; border-radius: 100px;
}
.badge-green  { background: rgba(34,197,94,.12); color: #16a34a; }
.badge-yellow { background: rgba(245,158,11,.12); color: #b45309; }
.badge-red    { background: rgba(239,68,68,.12); color: #dc2626; }
.badge-blue   { background: rgba(59,130,246,.12); color: #1d4ed8; }
.badge-gray   { background: rgba(100,116,139,.12); color: #475569; }

.actions-cell { display: flex; gap: 6px; flex-wrap: wrap; }

.empty-state { color: var(--muted); font-size: .88rem; padding: 40px; text-align: center; }
.loading-row { padding: 40px; display: flex; justify-content: center; }

/* ============================================================
   FILTER BAR
   ============================================================ */
.filter-bar {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.filter-bar input, .filter-bar select { max-width: 220px; flex: 1; }

/* ============================================================
   SETTINGS FORM
   ============================================================ */
.settings-form { max-width: 800px; }
.settings-section {
  background: var(--surface); border-radius: var(--radius); padding: 28px;
  border: 1px solid var(--border); margin-bottom: 24px;
}
.settings-section h3 { font-size: 1rem; color: var(--navy); margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.settings-section h3 i { color: var(--gold); }
.fields-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ============================================================
   CAROUSEL SLIDES LIST
   ============================================================ */
.slide-item {
  background: var(--surface); border-radius: var(--radius);
  padding: 20px; margin-bottom: 14px;
  border: 1.5px solid var(--border); display: flex; align-items: center; gap: 16px;
  transition: var(--t);
}
.slide-item:hover { border-color: var(--gold); }
.slide-order { width: 32px; height: 32px; background: var(--navy); color: var(--gold); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .85rem; flex-shrink: 0; }
.slide-info { flex: 1; }
.slide-info h4 { font-size: .95rem; color: var(--navy); margin-bottom: 3px; }
.slide-info p { font-size: .8rem; color: var(--muted); }
.slide-actions { display: flex; gap: 6px; }

/* ============================================================
   MODAL
   ============================================================ */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 9000;
  background: rgba(13,27,62,.6); backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center; padding: 20px;
}
.modal-backdrop.open { display: flex; animation: fadeIn .2s ease; }

.modal {
  background: var(--white); border-radius: 14px;
  width: 100%; max-width: 600px; max-height: 90vh;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px 16px; border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 1.1rem; color: var(--navy); }
.modal-close { background: none; border: none; color: var(--muted); font-size: 1.1rem; width: 30px; height: 30px; border-radius: 6px; transition: var(--t); }
.modal-close:hover { background: var(--bg); color: var(--danger); }

.modal-body { padding: 24px; overflow-y: auto; flex: 1; }
.modal-body .field { margin-bottom: 16px; }
.modal-body .field label { display: block; font-size: .8rem; font-weight: 600; color: var(--navy); margin-bottom: 5px; }
.modal-body .fields-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.modal-footer {
  padding: 16px 24px; border-top: 1px solid var(--border);
  display: flex; gap: 10px; justify-content: flex-end;
}
.btn-cancel { background: var(--bg); border: 1.5px solid var(--border); color: var(--text); font-size: .88rem; font-weight: 600; padding: 9px 20px; border-radius: 7px; transition: var(--t); }
.btn-cancel:hover { background: var(--border); }
.btn-submit { background: var(--navy); color: var(--white); font-size: .88rem; font-weight: 700; padding: 9px 24px; border-radius: 7px; border: none; transition: var(--t); display: flex; align-items: center; gap: 8px; }
.btn-submit:hover { background: var(--gold); color: var(--navy); }
.btn-submit:disabled { opacity: .5; cursor: not-allowed; }

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--navy); color: var(--white); padding: 12px 24px;
  border-radius: 8px; font-size: .88rem; font-weight: 500;
  box-shadow: var(--shadow-lg); z-index: 99999; opacity: 0;
  transition: all .35s ease; white-space: nowrap; border-left: 4px solid var(--gold);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }

/* ============================================================
   SPINNERS & SKELETONS
   ============================================================ */
.spinner {
  width: 18px; height: 18px; border: 2.5px solid rgba(255,255,255,.3);
  border-top-color: var(--white); border-radius: 50%;
  animation: spin .7s linear infinite;
}
.spinner-md { width: 28px; height: 28px; border: 3px solid var(--border); border-top-color: var(--gold); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   QUILL RICH-TEXT EDITOR
   ============================================================ */
.quill-wrap {
  border: 1.5px solid var(--border);
  border-radius: 7px;
  overflow: hidden;
  background: var(--white);
  transition: var(--t);
}
.quill-wrap:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(245,166,35,.15);
}
.quill-wrap .ql-toolbar {
  border: none;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  padding: 6px 10px;
}
.quill-wrap .ql-container {
  border: none;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: .9rem;
  min-height: 120px;
}
.quill-wrap .ql-editor { min-height: 120px; padding: 10px 14px; }
.quill-wrap .ql-editor.ql-blank::before { color: var(--muted); font-style: normal; }
/* Override Quill focus outline */
.quill-wrap .ql-container.ql-snow { border: none; }
.quill-wrap .ql-toolbar.ql-snow { border: none; border-bottom: 1px solid var(--border); }

/* ============================================================
   BULK UPLOAD
   ============================================================ */
.upload-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg);
  padding: 4px;
  border-radius: 8px;
  width: fit-content;
  margin-bottom: 24px;
  border: 1px solid var(--border);
}
.upload-tab {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: none;
  transition: var(--t);
  cursor: pointer;
}
.upload-tab.active { background: var(--white); color: var(--navy); box-shadow: 0 1px 4px rgba(0,0,0,.08); }

.upload-info-bar {
  background: rgba(59,130,246,.06);
  border: 1px solid rgba(59,130,246,.2);
  border-radius: 8px;
  padding: 14px 18px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.upload-info-item { font-size: .82rem; color: #1d4ed8; display: flex; align-items: center; gap: 8px; }
.upload-info-item code {
  background: rgba(59,130,246,.1);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: .78rem;
  font-family: monospace;
  color: #1e3a8a;
}

.upload-controls { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; align-items: flex-end; }

.upload-drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 48px 24px;
  text-align: center;
  background: var(--bg);
  transition: var(--t);
  cursor: pointer;
  margin-bottom: 24px;
}
.upload-drop-zone.dragover { border-color: var(--gold); background: rgba(245,166,35,.05); }
.upload-drop-zone i { font-size: 2.5rem; color: var(--muted); margin-bottom: 12px; display: block; }
.upload-drop-zone p { font-size: .95rem; color: var(--text); font-weight: 500; margin-bottom: 4px; }
.upload-drop-zone span { font-size: .82rem; color: var(--muted); display: block; margin-bottom: 16px; }
.template-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .82rem; color: var(--info); margin-top: 14px;
  text-decoration: underline;
}
.template-link:hover { color: var(--gold); }

.preview-header {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px; margin-bottom: 16px;
}
#previewSummary { font-size: .9rem; font-weight: 600; color: var(--navy); }

.error-list {
  background: rgba(239,68,68,.05);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: 8px;
  padding: 14px 18px;
  margin-bottom: 16px;
  max-height: 180px;
  overflow-y: auto;
}
.error-list p { font-size: .82rem; color: var(--danger); padding: 2px 0; }
.error-list .err-title { font-weight: 700; margin-bottom: 6px; font-size: .85rem; }

.progress-bar-wrap {
  width: 100%; height: 8px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 10px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-dk));
  border-radius: 100px;
  transition: width .4s ease;
  width: 0%;
}
#progressText { font-size: .85rem; color: var(--muted); text-align: center; }

.preview-actions { display: flex; gap: 10px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .dash-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-close { display: flex; }
  .main-wrap { margin-left: 0; }
  .menu-toggle { display: flex; }
  .panel-area { padding: 16px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .dash-cards { grid-template-columns: 1fr; }
  .modal-body .fields-row, .fields-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .login-card { padding: 32px 24px; }
  .stats-row { grid-template-columns: 1fr; }
  .filter-bar input, .filter-bar select { max-width: 100%; }
}

/* Photo in teacher card */
.teacher-photo { width: 80px; height: 80px; border-radius: 50%; object-fit: cover; border: 3px solid var(--gold); }

/* ============================================================
   MATH SYMBOL INPUT PANEL
   ============================================================ */
.math-sym-btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--gold); color: var(--navy); border: none; border-radius: 5px;
  padding: 2px 7px; font-size: 13px; font-weight: 700; cursor: pointer;
  margin-left: 6px; vertical-align: middle; line-height: 1.4;
  transition: opacity .15s;
}
.math-sym-btn:hover { opacity: .8; }
.math-sym-btn.active { background: var(--navy); color: #fff; }

.math-panel {
  border: 1px solid #d0d5e8; border-radius: 10px; overflow: hidden;
  margin: 8px 0 10px; background: var(--white);
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
}

.math-quick-bar {
  display: flex; gap: 6px; padding: 10px 12px;
  overflow-x: auto; background: #f4f6fd;
  border-bottom: 1px solid #e0e4ef;
  scrollbar-width: thin;
}
.math-quick-bar::-webkit-scrollbar { height: 4px; }
.math-quick-bar::-webkit-scrollbar-thumb { background: #c5cadc; border-radius: 2px; }

.math-sym-chip {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 32px; height: 32px; padding: 0 8px;
  background: var(--white); border: 1px solid #d0d5e8; border-radius: 6px;
  font-size: 15px; cursor: pointer; white-space: nowrap; flex-shrink: 0;
  transition: background .12s, border-color .12s;
  user-select: none;
}
.math-sym-chip:hover { background: var(--gold); border-color: var(--gold); color: var(--navy); }

.math-categories { max-height: 200px; overflow-y: auto; scrollbar-width: thin; }
.math-categories::-webkit-scrollbar { width: 4px; }
.math-categories::-webkit-scrollbar-thumb { background: #c5cadc; border-radius: 2px; }

.math-cat { border-bottom: 1px solid #eef0f8; }
.math-cat:last-child { border-bottom: none; }

.math-cat-hdr {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 14px; cursor: pointer; user-select: none;
  background: #f8f9ff; font-size: 13px; font-weight: 600; color: var(--navy);
  list-style: none;
}
.math-cat-hdr::-webkit-details-marker { display: none; }
.math-cat-hdr:hover { background: #eef0ff; }
.math-cat-arrow { font-size: 10px; color: var(--muted); margin-right: auto; margin-left: 2px; }
.math-cat-count {
  font-size: 11px; font-weight: 500; color: var(--gold-dark, #b8860b);
  background: rgba(212,175,55,.12); border-radius: 10px; padding: 1px 7px;
}

.math-cat-body { padding: 8px 12px 10px; display: flex; flex-wrap: wrap; gap: 5px; }