:root {
    --ink: #1a1a2e;
    --ink-light: #4a4a6a;
    --paper: #f7f5f0;
    --paper-warm: #ede9e0;
    --accent: #c0392b;
    --accent-soft: #f5e6e4;
    --gold: #b8860b;
    --gold-soft: #fdf5dc;
    --green: #2e7d52;
    --green-soft: #e6f4ec;
    --blue: #1a5276;
    --blue-soft: #e8f1f8;
    --border: #d4cfc4;
    --shadow: 0 2px 12px rgba(26,26,46,0.08);
    --shadow-lg: 0 8px 32px rgba(26,26,46,0.14);
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--paper);
    color: var(--ink);
    min-height: 100vh;
  }

  /* ─── LAYOUT ─── */
  .app { display: flex; min-height: 100vh; }
  .sidebar {
    --sidebar-w: 240px;
    width: var(--sidebar-w); min-width: var(--sidebar-w);
    background: var(--ink);
    color: #e8e6f0;
    display: flex; flex-direction: column;
    padding: 0;
    position: fixed; top: 0; left: 0; bottom: 0;
    overflow-y: auto; overflow-x: hidden;
    z-index: 100;
    transition: width 0.22s ease, min-width 0.22s ease;
  }
  .sidebar.collapsed { --sidebar-w: 15px; }
  .sidebar.collapsed .brand-title,
  .sidebar.collapsed .brand-sub,
  .sidebar.collapsed .nav-section,
  .sidebar.collapsed .nav-item span:not(.nav-icon),
  .sidebar.collapsed .sidebar-footer { display: none; }
  .sidebar.collapsed .brand { padding: 16px 0; text-align: center; }
  .sidebar.collapsed .nav-item { justify-content: center; padding: 10px 0; border-left: none; }
  .sidebar.collapsed .nav-item.active { background: rgba(192,57,43,0.18); border-radius: 6px; margin: 2px 4px; }
  .sidebar.collapsed .nav-icon { font-size: 16px; width: auto; }
  .main { margin-left: 240px; flex: 1; padding: 32px 36px; transition: margin-left 0.22s ease; }
  .main.sidebar-collapsed { margin-left: 15px; }

  /* Toggle: position:fixed so it's never clipped by the sidebar's overflow:hidden */
  .sidebar-toggle {
    position: fixed;
    top: 28px;
    left: calc(var(--sidebar-w, 240px));
    width: 28px; height: 28px;
    background: var(--ink); border: 1px solid rgba(255,255,255,0.15);
    border-radius: 6px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; color: #9090b0; font-weight: 600;
    z-index: 102;
    transition: left 0.22s ease, background 0.15s, color 0.15s, border-color 0.15s;
    box-shadow: var(--shadow);
  }
  /* When collapsed the sidebar is 42px; button sits at its right edge (42px - 14px = 28px) */
  .sidebar.collapsed .sidebar-toggle {
    left: var(--sidebar-w, 5px);
  }
  .sidebar-toggle:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

  /* ─── SIDEBAR ─── */
  .brand {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .brand-title {
    font-family: 'DM Serif Display', serif;
    font-size: 20px;
    color: #fff;
    line-height: 1.2;
  }
  .brand-sub {
    font-size: 11px;
    color: #9090b0;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: 4px;
  }
  nav { padding: 16px 0; flex: 1; }
  .nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 24px;
    cursor: pointer;
    font-size: 14px;
    color: #9090b0;
    transition: all 0.15s;
    border-left: 3px solid transparent;
  }
  .nav-item:hover { color: #fff; background: rgba(255,255,255,0.04); }
  .nav-item.active { color: #fff; border-left-color: var(--accent); background: rgba(192,57,43,0.12); }
  .nav-icon { font-size: 16px; width: 20px; text-align: center; }
  .nav-section {
    padding: 16px 24px 6px;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #5a5a7a;
  }
  .sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 12px;
    color: #5a5a7a;
  }

  /* ─── PAGE HEADER ─── */
  .page-header { margin-bottom: 28px; }
  .page-title {
    font-family: 'DM Serif Display', serif;
    font-size: 30px;
    color: var(--ink);
  }
  .page-sub { color: var(--ink-light); font-size: 14px; margin-top: 4px; }

  /* ─── STAT CARDS ─── */
  .stats-row { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; margin-bottom: 28px; }
  .stat-card {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .stat-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-light); }
  .stat-value { font-family: 'DM Serif Display', serif; font-size: 36px; color: var(--ink); margin-top: 4px; }
  .stat-note { font-size: 12px; color: var(--ink-light); margin-top: 2px; }
  .stat-accent { color: var(--accent); }

  /* ─── SESSION BI ANALYTICS ─── */
  .bi-kpi-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    margin-bottom: 22px;
  }
  .bi-kpi {
    background: linear-gradient(145deg, #fff 0%, var(--paper) 100%);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 18px;
    position: relative;
    overflow: hidden;
  }
  .bi-kpi::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--bi-accent, var(--accent));
  }
  .bi-kpi-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--ink-light);
  }
  .bi-kpi-value {
    font-family: 'DM Serif Display', serif;
    font-size: 32px;
    line-height: 1.1;
    margin-top: 6px;
    color: var(--ink);
  }
  .bi-kpi-sub { font-size: 11px; color: var(--ink-light); margin-top: 4px; }
  .bi-charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
  }
  .bi-vbar-chart { width: 100%; }
  .bi-vbar-chart svg { width: 100%; height: auto; display: block; }
  .saved-report-item {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 10px;
    background: var(--paper);
    overflow: hidden;
  }
  .saved-report-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    cursor: pointer;
    font-size: 13px;
  }
  .saved-report-head:hover { background: #fff; }
  .saved-report-body {
    padding: 0 14px 14px;
    font-size: 13px;
    line-height: 1.75;
    white-space: pre-wrap;
    border-top: 1px solid var(--border);
    display: none;
  }
  .saved-report-item.open .saved-report-body { display: block; padding-top: 12px; }
  .bi-chart-card {
    background: var(--paper);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
  }
  .bi-chart-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 12px;
  }
  .bi-chart-body { flex: 1; display: flex; align-items: center; justify-content: center; }
  .bi-donut-wrap { display: flex; align-items: center; gap: 16px; width: 100%; }
  .bi-donut-legend { font-size: 12px; line-height: 1.8; color: var(--ink-light); }
  .bi-donut-legend strong { color: var(--ink); }
  .bi-bar-chart { width: 100%; }
  .bi-bar-row {
    display: grid;
    grid-template-columns: 72px 1fr 36px;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 11px;
  }
  .bi-bar-track {
    height: 10px;
    background: var(--border);
    border-radius: 5px;
    overflow: hidden;
  }
  .bi-bar-fill { height: 100%; border-radius: 5px; transition: width 0.35s ease; }
  .confidence-chart-wrap {
    background: var(--paper);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 8px 4px;
    min-height: 160px;
  }
  .confidence-chart-wrap svg { width: 100%; height: auto; display: block; }
  .confidence-chart-empty {
    text-align: center;
    padding: 28px 12px;
    font-size: 12px;
    color: var(--ink-light);
  }

  @media (max-width: 1100px) {
    .bi-kpi-row { grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 900px) {
    .bi-kpi-row { grid-template-columns: 1fr 1fr; }
    .bi-charts-grid { grid-template-columns: 1fr; }
  }

  /* ─── SECTION CARDS ─── */
  .card {
    background: #fff;
    border-radius: 10px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
  }
  .card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
  }
  .card-title { font-size: 15px; font-weight: 600; }
  .card-body { padding: 20px; }

  /* ─── TABS ─── */
  .tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 20px; }
  .tab {
    padding: 10px 18px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.15s;
  }
  .tab:hover { color: var(--ink); }
  .tab.active { color: var(--accent); border-bottom-color: var(--accent); }

  /* ─── LEARNER TABLE ─── */
  .search-bar {
    display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap;
  }
  .search-bar .search-input-wrap { flex: 1; min-width: 180px; }
  .search-bar .search-input-wrap.search-bar-med {
    flex: 0 1 40vw;
    max-width: 40vw;
    min-width: 160px;
  }
  .search-bar select {
    padding: 8px 12px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 13px; font-family: inherit;
    background: var(--paper); cursor: pointer; outline: none;
  }
  .search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
    min-width: 0;
  }
  .search-input-wrap input {
    width: 100%;
    min-width: 0;
    padding: 8px 32px 8px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    background: var(--paper);
    outline: none;
  }
  .search-input-wrap input:focus { border-color: var(--accent); }
  .search-clear {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    border: none;
    background: transparent;
    color: var(--ink-light);
    cursor: pointer;
    font-size: 15px;
    line-height: 1;
    padding: 4px 7px;
    border-radius: 4px;
  }
  .search-clear:hover { color: var(--accent); background: var(--accent-soft); }
  .log-filters .search-input-wrap { flex: 1; min-width: 180px; }
  .log-filters .search-input-wrap input { padding: 7px 32px 7px 11px; }
  .card-header .search-input-wrap { flex: 0 1 220px; min-width: 140px; }
  .card-header .search-input-wrap input { padding: 7px 32px 7px 11px; }
  table { width: 100%; border-collapse: collapse; font-size: 13px; }
  /* Sticky thead only works inside a scrolling box — max-height forces that box to scroll. */
  .table-scroll { overflow: auto; -webkit-overflow-scrolling: touch; }
  #page-learners .table-scroll,
  #page-assessment .table-scroll,
  #page-dashboard .table-scroll {
    max-height: calc(100vh - 260px);
  }
  #page-sessions .table-scroll {
    max-height: calc(100vh - 160px); /* extra room for filter bar + page header */
  }
  .table-sticky thead th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--paper-warm);
    box-shadow: 0 1px 0 var(--border);
  }
  thead th {
    text-align: left; padding: 8px 12px;
    font-size: 11px; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.05em;
    color: var(--ink-light);
    border-bottom: 1px solid var(--border);
    background: var(--paper-warm);
  }
  tbody tr { border-bottom: 1px solid #f0ece4; transition: background 0.1s; }
  tbody tr.clickable { cursor: pointer; }
  tbody tr.clickable:hover { background: var(--paper); }
  tbody td { padding: 10px 12px; vertical-align: middle; }

  /* ─── BADGES ─── */
  .badge {
    display: inline-block;
    padding: 2px 8px; border-radius: 20px;
    font-size: 11px; font-weight: 600;
    letter-spacing: 0.03em;
  }
  .badge-A1 { background: #f8d7da; color: #7d1128; }
  .badge-A2 { background: #fde8cb; color: #7a4000; }
  .badge-B1 { background: var(--gold-soft); color: var(--gold); }
  .badge-B2 { background: var(--blue-soft); color: var(--blue); }
  .badge-C1 { background: var(--green-soft); color: var(--green); }
  .badge-active { background: var(--green-soft); color: var(--green); }
  .badge-new { background: var(--blue-soft); color: var(--blue); }
  .badge-inactive { background: #f0ece4; color: var(--ink-light); }
  .badge-none { background: #f0ece4; color: var(--ink-light); }
  .badge-group { background: var(--blue-soft); color: var(--blue); }
  .badge-individual { background: var(--accent-soft); color: var(--accent); }

  /* ─── ATTENDANCE BAR ─── */
  .att-bar {
    display: flex; align-items: center; gap: 8px;
  }
  .att-track {
    flex: 1; height: 6px; background: var(--border);
    border-radius: 3px; overflow: hidden;
  }
  .att-fill {
    height: 100%; border-radius: 3px;
    transition: width 0.3s;
  }
  .att-good { background: var(--green); }
  .att-mid { background: var(--gold); }
  .att-low { background: var(--accent); }
  .att-label { font-size: 11px; color: var(--ink-light); min-width: 32px; text-align: right; }

  /* ─── LEARNER DETAIL PANEL ─── */
  .panel-overlay {
    position: fixed; inset: 0;
    background: rgba(26,26,46,0.35);
    z-index: 200;
    display: none;
  }
  .panel-overlay.open { display: flex; justify-content: flex-end; }
  .panel {
    width: 480px; max-width: 95vw;
    background: #fff;
    height: 100vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.2s ease;
  }
  @keyframes slideIn { from { transform: translateX(40px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
  .panel-head {
    padding: 24px;
    background: var(--ink);
    color: #fff;
    position: relative;
  }
  .panel-name { font-family: 'DM Serif Display', serif; font-size: 22px; }
  .panel-role { font-size: 13px; color: #9090b0; margin-top: 3px; }
  .panel-close {
    position: sticky; top: 15%; right: 15%;
    cursor: pointer; font-size: 20px; color: #9090b0;
    width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
    border-radius: 10%; transition: background 0.15s;
  }
  .panel-close:hover { background: rgba(255,255,255,0.1); color: #fff; }
  .panel-body { padding: 24px; }
  .profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 20px; }
  .profile-item label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-light); display: block; margin-bottom: 2px; }
  .profile-item span { font-size: 14px; font-weight: 500; }
  .notes-box {
    background: var(--paper);
    border-radius: 8px;
    padding: 14px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--ink);
    border-left: 3px solid var(--gold);
    margin-bottom: 20px;
    font-style: italic;
  }
  .section-label {
    font-size: 11px; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.07em;
    color: var(--ink-light);
    margin-bottom: 10px;
    margin-top: 20px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
  }
  .session-item {
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 6px;
    border: 1px solid var(--border);
    font-size: 13px;
    transition: background 0.1s, border-color 0.1s;
  }
  .session-item[style*="cursor:pointer"]:hover { background: var(--paper); }
  .session-item-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
  .session-date { color: var(--ink-light); font-size: 11px; margin-top: 2px; }
  .session-topic { font-weight: 500; }
  .session-note { font-size: 12px; color: var(--ink-light); margin-top: 4px; font-style: italic; }
  .session-attended { font-size: 11px; }
  .session-yes { color: var(--green); }
  .session-no { color: var(--accent); }

  /* ─── PAIRING ─── */
  /* ─── LEARNER CARD (draggable) ─── */
  .learner-card {
    display: inline-flex; flex-direction: column; gap: 4px;
    padding: 10px 12px; border-radius: 8px;
    border: 2px solid var(--border); background: #fff;
    cursor: grab; user-select: none;
    font-size: 13px; min-width: 145px; max-width: 200px;
    transition: border-color 0.15s, box-shadow 0.15s, opacity 0.15s;
  }
  .learner-card:active { cursor: grabbing; }
  .learner-card.selected { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
  .learner-card.dragging { opacity: 0.35; }
  .lc-name { font-weight: 600; font-size: 13px; line-height: 1.3; }
  .lc-meta { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }

  /* ─── UNPAIRED POOL ─── */
  .unpaired-pool {
    display: flex; flex-wrap: wrap; gap: 10px;
    padding: 16px; border-radius: 10px;
    border: 2px dashed var(--border); background: var(--paper);
    min-height: 70px;
    transition: border-color 0.15s, background 0.15s;
  }
  .unpaired-pool.drag-over { border-color: var(--accent); background: var(--accent-soft); }

  /* ─── PAIR SLOTS ─── */
  .pair-slots { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  /* The whole pair-slot is the drop zone */
  .pair-slot {
    border: 2px dashed var(--border); border-radius: 10px;
    padding: 14px; background: #fff; box-shadow: var(--shadow);
    cursor: pointer; transition: border-color 0.15s, background 0.15s;
  }
  .pair-slot.drag-over { border-color: var(--accent); background: var(--accent-soft); }
  .pair-slot-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
  .pair-slot-number { font-family: 'DM Serif Display', serif; font-size: 20px; color: var(--accent); flex-shrink: 0; }
  .pair-slot-info { flex: 1; font-size: 12px; color: var(--ink-light); font-style: italic; line-height: 1.35; }
  .pair-slot-info strong { color: var(--ink); font-style: normal; }
  .pair-slot-body { display: flex; flex-wrap: wrap; gap: 10px; min-height: 70px; align-items: flex-start; }
  .pair-slot-empty { color: var(--ink-light); font-size: 13px; padding: 18px; width: 100%; text-align: center; }

  /* ─── AI SETTINGS ─── */
  .ai-settings { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 16px; background: #fff; }
  .ai-settings-toggle {
    padding: 10px 16px; cursor: pointer;
    display: flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 500;
  }
  .ai-settings-body { padding: 0 16px 14px; display: none; }
  .ai-settings.open .ai-settings-body { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }

  /* keep old pair-card styles for backward compat */
  .pair-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    margin-bottom: 10px;
    display: flex; align-items: flex-start; gap: 14px;
  }
  .pair-id {
    font-family: 'DM Serif Display', serif;
    font-size: 22px; color: var(--accent);
    min-width: 36px;
  }
  .pair-names { font-weight: 600; font-size: 14px; }
  .pair-profile { font-size: 12px; color: var(--ink-light); margin-top: 2px; }
  .pair-comment { font-size: 12px; color: var(--ink); margin-top: 4px; font-style: italic; }

  /* ─── DASHBOARD SUMMARY ─── */
  .level-bars { margin-top: 10px; }
  .level-row { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
  .level-name { width: 28px; font-weight: 600; font-size: 13px; }
  .level-track { flex: 1; height: 10px; background: var(--border); border-radius: 5px; overflow: hidden; }
  .level-fill { height: 100%; border-radius: 5px; }
  .level-count { font-size: 12px; color: var(--ink-light); min-width: 24px; text-align: right; }

  /* ─── IMPORT ZONE ─── */
  .import-zone {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 24px;
    text-align: center;
    background: var(--paper);
    margin-bottom: 20px;
  }
  .import-zone textarea {
    width: 100%; min-height: 120px;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px;
    font-family: 'DM Sans', sans-serif;
    font-size: 12px;
    resize: vertical;
    background: #fff;
    outline: none;
    margin-top: 12px;
  }
  .import-zone textarea:focus { border-color: var(--accent); }
  .btn {
    padding: 9px 20px;
    border-radius: 6px;
    border: none;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
  }
  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: #a93226; }
  .btn-secondary { background: var(--paper-warm); color: var(--ink); border: 1px solid var(--border); }
  .btn-secondary:hover { background: var(--border); }
  .btn-sm { padding: 5px 12px; font-size: 12px; }

  /* ─── SESSION LOG ─── */
  .log-filters { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
  .log-filters select, .log-filters input {
    padding: 7px 11px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 13px; font-family: inherit;
    background: var(--paper); outline: none;
  }
  .add-session-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .add-session-form input, .add-session-form select, .add-session-form textarea {
    padding: 8px 12px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 13px; font-family: inherit;
    background: var(--paper); outline: none; width: 100%;
  }
  .add-session-form textarea { grid-column: 1/-1; min-height: 70px; resize: vertical; }
  .form-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-light); margin-bottom: 4px; display: block; }
  .form-group { display: flex; flex-direction: column; }

  /* ─── UTILITY ─── */
  .flex { display: flex; }
  .gap-8 { gap: 8px; }
  .mt-8 { margin-top: 8px; }
  .text-muted { color: var(--ink-light); }
  .text-sm { font-size: 12px; }
  .hidden { display: none !important; }
  .chip {
    display: inline-block; padding: 2px 8px;
    border-radius: 20px; font-size: 11px;
    background: var(--paper-warm); color: var(--ink-light);
    margin: 2px;
  }
  .result-badge {
    display: inline-block; padding: 2px 7px;
    border-radius: 4px; font-size: 12px; font-weight: 600;
  }
  .result-ok { background: var(--green-soft); color: var(--green); }
  .result-bad { background: var(--accent-soft); color: var(--accent); }

  /* ─── EDIT MODAL ─── */
  .modal-overlay {
    position: fixed; inset: 0; background: rgba(26,26,46,0.45);
    z-index: 300; display: none; align-items: center; justify-content: center; padding: 20px;
  }
  .modal-overlay.open { display: flex; }
  .modal {
    background: #fff; border-radius: 12px;
    width: 540px; max-width: 100%; max-height: 90vh; overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }
  .modal-head {
    padding: 18px 22px; border-bottom: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center; gap: 16px;
    position: sticky; top: 0; background: #fff; z-index: 1;
  }
  .modal-title { font-family: 'DM Serif Display', serif; font-size: 20px; flex: 1; min-width: 0; }
  .modal-head-actions {
    display: flex; align-items: center; gap: 8px; flex-shrink: 0; margin-left: auto;
  }
  .modal-head .panel-close,
  .modal-close {
    position: static; top: auto; right: auto;
    cursor: pointer; font-size: 18px; color: var(--ink-light);
    width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
    border-radius: 6px; border: none; background: transparent; padding: 0;
    transition: background 0.15s, color 0.15s; flex-shrink: 0;
  }
  .modal-head .panel-close:hover,
  .modal-close:hover { background: var(--bg-soft, #f0ece4); color: var(--ink); }
  .modal-body { padding: 22px; }
  .modal-foot {
    padding: 16px 22px; border-top: 1px solid var(--border);
    display: flex; justify-content: flex-end; gap: 10px;
    position: sticky; bottom: 0; background: #fff;
  }
  .edit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .edit-grid .full { grid-column: 1/-1; }
  .edit-grid label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-light); display: block; margin-bottom: 4px; }
  .edit-grid input, .edit-grid select, .edit-grid textarea {
    width: 100%; padding: 8px 10px; border: 1px solid var(--border);
    border-radius: 6px; font-family: inherit; font-size: 13px; background: var(--paper); outline: none;
  }
  .edit-grid input:focus, .edit-grid select:focus, .edit-grid textarea:focus { border-color: var(--accent); }
  .edit-grid textarea { min-height: 70px; resize: vertical; }
  .icon-btn {
    background: none; border: 1px solid var(--border); border-radius: 6px;
    cursor: pointer; padding: 3px 9px; font-size: 14px; line-height: 1.4;
  }
  .icon-btn:hover { background: var(--accent-soft); border-color: var(--accent); }
  .icon-btn-danger { color: var(--accent); }
  .icon-btn-danger:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

  /* ─── MOBILE TOPBAR (hidden on desktop) ─── */
  .topbar {
    display: none;
    position: sticky; top: 0; z-index: 90;
    background: var(--ink); color: #fff;
    align-items: center; gap: 12px;
    padding: 12px 16px;
  }
  .hamburger {
    background: none; border: none; color: #fff;
    font-size: 22px; cursor: pointer; line-height: 1;
    padding: 4px 8px; border-radius: 6px;
  }
  .hamburger:active { background: rgba(255,255,255,0.12); }
  .topbar-title { font-family: 'DM Serif Display', serif; font-size: 17px; }
  .scrim {
    display: none;
    position: fixed; inset: 0; background: rgba(26,26,46,0.45);
    z-index: 95;
  }
  .scrim.open { display: block; }

  @media (max-width: 900px) {
    .stats-row { grid-template-columns: 1fr 1fr; }
    .sidebar:not(.collapsed) { width: 200px; min-width: 200px; --sidebar-w: 200px; }
    .main:not(.sidebar-collapsed) { margin-left: 200px; padding: 20px; }
    .main.sidebar-collapsed { margin-left: 2px; padding: 2px; }
  }

  /* ─── PHONE / TABLET: off-canvas sidebar ─── */
  @media (max-width: 760px) {
    .topbar { display: flex; }
    .sidebar {
      transform: translateX(-100%);
      transition: transform 0.22s ease;
      width: 260px; min-width: 260px;
      box-shadow: var(--shadow-lg);
    }
    .sidebar.open { transform: translateX(0); }
    .main { margin-left: 0; padding: 16px; }
    .stats-row { grid-template-columns: 1fr 1fr; gap: 10px; }
    .stat-value { font-size: 28px; }
    .page-title { font-size: 24px; }
    /* Stack the two-column dashboard / pairing grids */
    [style*="grid-template-columns:1fr 1fr"],
    [style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }
    .add-session-form, .edit-grid { grid-template-columns: 1fr; }
    .pair-slots { grid-template-columns: 1fr; }
    .learner-card { max-width: 100%; }
    .ai-settings.open .ai-settings-body { flex-direction: column; }
    .panel { width: 100%; max-width: 100%; }
    /* Tables scroll horizontally instead of overflowing the viewport */
    .card-body { overflow-x: auto; }
    table { min-width: 560px; }
    .nav-item { padding: 12px 24px; font-size: 15px; }  /* bigger touch targets */
  }
  @media (max-width: 420px) {
    .stats-row { grid-template-columns: 1fr; }
  }