:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --border: #2a2d3a;
    --text: #e1e4ed;
    --text-dim: #8b8fa3;
    --accent: #6c8cff;
    --accent-hover: #5a7aee;
    --green: #34d399;
    --orange: #fb923c;
    --red: #f87171;
    --yellow: #facc15;
    --purple: #a78bfa;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg); color: var(--text); min-height: 100vh; padding: 24px;
  }
  h1 { font-size: 1.6rem; font-weight: 600; margin-bottom: 6px; }
  .subtitle { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 24px; }

  .file-loader {
    display: flex; align-items: center; gap: 12px; margin-bottom: 24px; flex-wrap: wrap;
  }
  .file-loader label {
    background: var(--surface); border: 1px dashed var(--border); border-radius: 8px;
    padding: 10px 20px; cursor: pointer; transition: border-color 0.2s; font-size: 0.9rem;
  }
  .file-loader label:hover { border-color: var(--accent); }
  .file-loader input[type="file"] { display: none; }
  .file-name { color: var(--text-dim); font-size: 0.85rem; }

  /* KPI cards */
  .kpi-row {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px; margin-bottom: 24px;
  }
  .kpi { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
  .kpi-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-dim); margin-bottom: 6px; }
  .kpi-value { font-size: 1.5rem; font-weight: 700; }

  /* Filter bar */
  .controls {
    display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; align-items: flex-end;
  }
  .filter-group { display: flex; flex-direction: column; gap: 4px; }
  .filter-label {
    font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-dim);
  }
  select {
    background: var(--surface); border: 1px solid var(--border); color: var(--text);
    padding: 8px 14px; border-radius: 6px; font-size: 0.85rem; outline: none; max-width: 360px;
  }
  select:focus { border-color: var(--accent); }

  /* Customer detail panel */
  .detail-panel {
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
    padding: 20px; margin-bottom: 24px; display: none;
  }
  .detail-panel h2 { font-size: 1.1rem; font-weight: 600; margin-bottom: 14px; }
  .detail-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px;
  }
  .detail-item { background: var(--bg); border-radius: 8px; padding: 12px; }
  .detail-item .d-label {
    font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em;
    color: var(--text-dim); margin-bottom: 3px;
  }
  .detail-item .d-value { font-size: 0.9rem; font-weight: 500; word-break: break-all; }
  .badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
  .badge-enabled { background: rgba(52,211,153,0.15); color: var(--green); }
  .badge-direct { background: rgba(108,140,255,0.15); color: var(--accent); }
  .badge-tenant { background: rgba(167,139,250,0.15); color: var(--purple); }
  .badge-mssp { background: rgba(251,146,60,0.15); color: var(--orange); }
  .badge-enterprise { background: rgba(250,204,21,0.15); color: var(--yellow); }

  /* Feature flags collapsible */
  .ff-section { margin-top: 16px; }
  .ff-toggle {
    background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
    padding: 10px 14px; cursor: pointer; display: flex; align-items: center;
    gap: 8px; font-size: 0.85rem; color: var(--text); width: 100%;
    transition: border-color 0.2s;
  }
  .ff-toggle:hover { border-color: var(--accent); }
  .ff-toggle .ff-arrow { transition: transform 0.2s; font-size: 0.7rem; }
  .ff-toggle.open .ff-arrow { transform: rotate(90deg); }
  .ff-body {
    display: none; background: var(--bg); border: 1px solid var(--border);
    border-top: none; border-radius: 0 0 8px 8px; padding: 12px 14px;
    max-height: 400px; overflow-y: auto; font-size: 0.8rem;
  }
  .ff-body.open { display: block; }
  .ff-row {
    display: flex; justify-content: space-between; padding: 3px 0;
    border-bottom: 1px solid rgba(42,45,58,0.5);
  }
  .ff-row:last-child { border-bottom: none; }
  .ff-key { color: var(--text-dim); }
  .ff-val { font-weight: 500; }
  .ff-val-true { color: var(--green); }
  .ff-val-false { color: var(--red); }

  /* Capacity planning */
  .capacity-section {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; padding: 20px; margin-bottom: 24px;
  }
  .capacity-section h2 { font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
  .capacity-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .input-group { display: flex; flex-direction: column; gap: 8px; }
  .input-group label {
    font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.04em;
  }
  .input-row { display: flex; align-items: center; gap: 12px; }
  .input-row input[type="text"] {
    background: var(--bg); border: 1px solid var(--border); color: var(--text);
    padding: 8px 12px; border-radius: 6px; font-size: 0.95rem; width: 140px;
    outline: none; font-variant-numeric: tabular-nums;
  }
  .input-row input[type="text"]:focus { border-color: var(--accent); }
  .input-row .unit { color: var(--text-dim); font-size: 0.85rem; white-space: nowrap; }
  input[type="range"] {
    flex: 1; -webkit-appearance: none; appearance: none;
    height: 6px; background: var(--border); border-radius: 3px; outline: none;
  }
  input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
    background: var(--accent); cursor: pointer; border: 2px solid var(--surface);
  }
  input[type="range"]::-moz-range-thumb {
    width: 18px; height: 18px; border-radius: 50%;
    background: var(--accent); cursor: pointer; border: 2px solid var(--surface);
  }

  .projection-summary {
    background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
    padding: 16px; margin-top: 16px;
  }
  .projection-summary h3 {
    font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em;
    color: var(--text-dim); margin-bottom: 10px;
  }
  .projection-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px;
  }
  .proj-item { display: flex; flex-direction: column; gap: 2px; }
  .proj-label { font-size: 0.75rem; color: var(--text-dim); }
  .proj-value { font-size: 1.1rem; font-weight: 600; }
  .proj-value.danger { color: var(--red); }
  .proj-value.warning { color: var(--orange); }
  .proj-value.safe { color: var(--green); }

  /* Table view toggle */
  .table-view-toggle {
    display: flex; gap: 4px; margin-bottom: 12px; flex-wrap: wrap;
  }
  .toggle-pill {
    background: var(--surface); border: 1px solid var(--border); color: var(--text-dim);
    padding: 6px 16px; border-radius: 20px; font-size: 0.78rem; cursor: pointer;
    transition: all 0.2s; white-space: nowrap;
  }
  .toggle-pill:hover { border-color: var(--accent); color: var(--text); }
  .toggle-pill.active {
    background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600;
  }
  .toggle-pill.disabled {
    opacity: 0.4; cursor: not-allowed; pointer-events: none;
  }
  .daily-unavailable {
    color: var(--text-dim); font-size: 0.82rem; padding: 20px;
    text-align: center; background: var(--surface); border: 1px dashed var(--border);
    border-radius: 10px; margin-bottom: 24px;
  }

  /* Table */
  .table-wrap {
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
    overflow: auto; margin-bottom: 28px; max-height: 520px;
  }
  table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
  thead { position: sticky; top: 0; z-index: 2; }
  th {
    background: #22253a; padding: 10px 12px; text-align: left; font-weight: 600;
    white-space: nowrap; border-bottom: 2px solid var(--border); cursor: pointer; user-select: none;
  }
  th:hover { color: var(--accent); }
  th .sort-arrow { margin-left: 4px; font-size: 0.7rem; }
  td { padding: 8px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
  tr:hover td { background: rgba(108,140,255,0.06); }
  .num-cell { text-align: right; font-variant-numeric: tabular-nums; }

  /* Charts */
  .chart-section {
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
    padding: 20px; margin-bottom: 28px;
  }
  .chart-title { font-size: 1rem; font-weight: 600; margin-bottom: 14px; }
  .chart-container { position: relative; width: 100%; max-height: 420px; }

  .empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); }
  .empty-state h2 { font-size: 1.2rem; margin-bottom: 8px; color: var(--text); }

  @media (max-width: 640px) { .capacity-inputs { grid-template-columns: 1fr; } }

  /* Auth gate */
  .auth-screen {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    min-height: 80vh; text-align: center;
  }
  .auth-screen h1 { font-size: 1.8rem; margin-bottom: 8px; }
  .auth-screen p { color: var(--text-dim); margin-bottom: 32px; font-size: 0.95rem; }
  .auth-screen .auth-domains {
    color: var(--text-dim); font-size: 0.8rem; margin-top: 16px;
  }
  .auth-error {
    background: rgba(248,113,113,0.1); border: 1px solid var(--red);
    border-radius: 8px; padding: 14px 20px; margin-top: 20px;
    color: var(--red); font-size: 0.9rem; display: none;
  }
  .user-bar {
    display: flex; align-items: center; justify-content: flex-end;
    gap: 12px; margin-bottom: 16px; padding: 8px 0;
  }
  .user-bar .user-info {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.85rem; color: var(--text-dim);
  }
  .user-bar .user-avatar {
    width: 28px; height: 28px; border-radius: 50%;
    border: 2px solid var(--border);
  }
  .user-bar .user-email { color: var(--text); font-weight: 500; }
  .user-bar .sign-out-btn {
    background: var(--surface); border: 1px solid var(--border);
    color: var(--text-dim); padding: 5px 14px; border-radius: 6px;
    font-size: 0.8rem; cursor: pointer; transition: border-color 0.2s;
  }
  .user-bar .sign-out-btn:hover { border-color: var(--red); color: var(--red); }
  .user-bar .admin-btn {
    background: var(--surface); border: 1px solid var(--border);
    color: var(--accent); padding: 5px 14px; border-radius: 6px;
    font-size: 0.8rem; cursor: pointer; transition: border-color 0.2s;
  }
  .user-bar .admin-btn:hover { border-color: var(--accent); }
  .user-bar .prefs-btn {
    background: var(--surface); border: 1px solid var(--border);
    color: var(--purple); padding: 5px 14px; border-radius: 6px;
    font-size: 0.8rem; cursor: pointer; transition: border-color 0.2s;
  }
  .user-bar .prefs-btn:hover { border-color: var(--purple); }
  .user-bar .help-btn {
    background: var(--surface); border: 1px solid var(--border);
    color: var(--green); padding: 5px 14px; border-radius: 6px;
    font-size: 0.8rem; cursor: pointer; transition: border-color 0.2s;
  }
  .user-bar .help-btn:hover { border-color: var(--green); }

  /* Help overlay */
  .help-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7); z-index: 1000; display: none;
    justify-content: center; align-items: flex-start; padding: 40px 20px;
    overflow-y: auto;
  }
  .help-overlay.open { display: flex; }
  .help-panel {
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    width: 100%; max-width: 900px; max-height: 85vh; overflow-y: auto; padding: 28px;
  }
  .help-panel h2 { font-size: 1.2rem; margin-bottom: 16px; display: flex; justify-content: space-between; align-items: center; }
  .help-tabs { display: flex; gap: 4px; margin-bottom: 20px; flex-wrap: wrap; }
  .help-tab {
    background: var(--bg); border: 1px solid var(--border); color: var(--text-dim);
    padding: 8px 16px; border-radius: 8px; font-size: 0.82rem; cursor: pointer;
    transition: all 0.2s;
  }
  .help-tab:hover { border-color: var(--accent); color: var(--text); }
  .help-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
  .help-content { font-size: 0.88rem; line-height: 1.7; color: var(--text); }
  .help-content h3 { font-size: 1rem; font-weight: 600; margin: 20px 0 8px; color: var(--accent); }
  .help-content h4 { font-size: 0.9rem; font-weight: 600; margin: 14px 0 6px; }
  .help-content p { margin-bottom: 10px; }
  .help-content ul, .help-content ol { margin: 8px 0 12px 20px; }
  .help-content li { margin-bottom: 4px; }
  .help-content code { background: var(--bg); padding: 2px 6px; border-radius: 4px; font-size: 0.82rem; }
  .help-content table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 0.82rem; }
  .help-content th { background: var(--bg); padding: 8px 10px; text-align: left; border-bottom: 2px solid var(--border); font-weight: 600; }
  .help-content td { padding: 6px 10px; border-bottom: 1px solid var(--border); }
  .help-content strong { color: var(--text); }

  /* Testing badge */
  .staging-badge {
    display: inline-block; background: rgba(251,146,60,0.15); color: var(--orange);
    padding: 2px 10px; border-radius: 4px; font-size: 0.7rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.08em; margin-left: 10px; vertical-align: middle;
  }

  /* Admin panel overlay */
  .admin-overlay {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7); z-index: 100; justify-content: center; align-items: flex-start;
    padding: 40px 20px; overflow-y: auto;
  }
  .admin-overlay.open { display: flex; }
  .admin-panel {
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    padding: 24px; max-width: 900px; width: 100%; max-height: 85vh; overflow-y: auto;
  }
  .admin-panel h2 { font-size: 1.2rem; margin-bottom: 20px; display: flex; align-items: center; justify-content: space-between; }
  .admin-panel .close-btn {
    background: none; border: 1px solid var(--border); color: var(--text-dim);
    padding: 4px 12px; border-radius: 6px; cursor: pointer; font-size: 0.8rem;
  }
  .admin-panel .close-btn:hover { border-color: var(--red); color: var(--red); }
  .admin-section {
    background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
    padding: 16px; margin-bottom: 16px;
  }
  .admin-section h3 { font-size: 0.9rem; margin-bottom: 12px; color: var(--accent); }
  .admin-list { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
  .admin-chip {
    display: flex; align-items: center; gap: 6px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; font-size: 0.8rem;
  }
  .admin-chip .remove-chip {
    cursor: pointer; color: var(--red); font-weight: 700; font-size: 0.9rem;
  }
  .admin-chip .remove-chip:hover { opacity: 0.7; }
  .admin-add-row { display: flex; gap: 8px; }
  .admin-add-row input {
    flex: 1; background: var(--surface); border: 1px solid var(--border); color: var(--text);
    padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; outline: none;
  }
  .admin-add-row input:focus { border-color: var(--accent); }
  .admin-add-row button, .admin-panel .action-btn {
    background: var(--accent); color: #fff; border: none; padding: 6px 16px;
    border-radius: 6px; font-size: 0.8rem; cursor: pointer; white-space: nowrap;
  }
  .admin-add-row button:hover, .admin-panel .action-btn:hover { background: var(--accent-hover); }
  .admin-status { font-size: 0.8rem; color: var(--green); margin-top: 8px; display: none; }
  .admin-input-row { display: flex; gap: 8px; margin-bottom: 12px; }
  .admin-input-row input, .admin-input-row select {
    background: var(--bg); border: 1px solid var(--border); color: var(--text);
    padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; outline: none;
  }
  .admin-input-row input:focus { border-color: var(--accent); }

  /* Storage file browser */
  .storage-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; margin-top: 8px; }
  .storage-table th { background: var(--surface); padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); }
  .storage-table td { padding: 6px 10px; border-bottom: 1px solid var(--border); }
  .storage-table tr:hover td { background: rgba(108,140,255,0.06); }
  .storage-actions { display: flex; gap: 6px; }
  .storage-actions button {
    background: none; border: 1px solid var(--border); color: var(--text-dim);
    padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; cursor: pointer;
  }
  .storage-actions .del-btn:hover { border-color: var(--red); color: var(--red); }
  .storage-actions .dl-btn:hover { border-color: var(--accent); color: var(--accent); }

  /* Customers overview in admin */
  .customers-overview { margin-top: 8px; }
  .co-tabs { display: flex; gap: 4px; margin-bottom: 12px; flex-wrap: wrap; }
  .co-tab {
    background: var(--surface); border: 1px solid var(--border); color: var(--text-dim);
    padding: 5px 14px; border-radius: 6px; font-size: 0.8rem; cursor: pointer;
  }
  .co-tab:hover { border-color: var(--accent); color: var(--text); }
  .co-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
  .co-group {
    background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
    padding: 12px; margin-bottom: 10px;
  }
  .co-group-header {
    display: flex; justify-content: space-between; align-items: center;
    cursor: pointer; font-size: 0.9rem; font-weight: 600;
  }
  .co-group-header:hover { color: var(--accent); }
  .co-group-meta { font-size: 0.75rem; color: var(--text-dim); font-weight: 400; }
  .co-group-body { display: none; margin-top: 10px; }
  .co-group.open .co-group-body { display: block; }
  .co-customer-row {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 8px;
    padding: 5px 0; border-bottom: 1px solid rgba(42,45,58,0.4); font-size: 0.78rem;
    align-items: center;
  }
  .co-customer-row:last-child { border-bottom: none; }
  .co-customer-row.co-header { font-weight: 600; color: var(--text-dim); text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.04em; }
  .co-search {
    background: var(--surface); border: 1px solid var(--border); color: var(--text);
    padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; outline: none; width: 100%; margin-bottom: 12px;
  }
  .co-search:focus { border-color: var(--accent); }
  .co-stat { display: inline-block; margin-right: 16px; }
  .co-stat-val { font-weight: 700; font-size: 1rem; }
  .co-stat-label { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; }

  /* Preferences panel */
  .prefs-overlay {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7); z-index: 100; justify-content: center; align-items: flex-start;
    padding: 40px 20px; overflow-y: auto;
  }
  .prefs-overlay.open { display: flex; }
  .prefs-panel {
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    padding: 24px; max-width: 700px; width: 100%; max-height: 85vh; overflow-y: auto;
  }
  .prefs-panel h2 { font-size: 1.2rem; margin-bottom: 20px; display: flex; align-items: center; justify-content: space-between; }
  .prefs-customer-list { margin-bottom: 16px; }
  .prefs-customer-item {
    background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
    padding: 12px; margin-bottom: 8px;
  }
  .prefs-customer-item h4 { font-size: 0.9rem; margin-bottom: 6px; }
  .prefs-customer-item .prefs-detail { font-size: 0.8rem; color: var(--text-dim); }
  .prefs-customer-item .prefs-actions { display: flex; gap: 8px; margin-top: 8px; }

  /* Save defaults button in capacity section */
  .save-defaults-btn {
    background: var(--accent); color: #fff; border: none; padding: 8px 20px;
    border-radius: 6px; font-size: 0.85rem; cursor: pointer; margin-top: 12px;
  }
  .save-defaults-btn:hover { background: var(--accent-hover); }
  .save-feedback { font-size: 0.8rem; color: var(--green); margin-left: 12px; display: none; }

  /* Toggle switch */
  .toggle-switch { position: relative; display: inline-block; width: 36px; height: 20px; }
  .toggle-switch input { opacity: 0; width: 0; height: 0; }
  .toggle-slider {
    position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
    background-color: #3a3d4a; border-radius: 20px; transition: 0.3s;
  }
  .toggle-slider:before {
    position: absolute; content: ""; height: 14px; width: 14px; left: 3px; bottom: 3px;
    background-color: #8b8fa3; border-radius: 50%; transition: 0.3s;
  }
  .toggle-switch input:checked + .toggle-slider { background-color: #b388ff; }
  .toggle-switch input:checked + .toggle-slider:before { transform: translateX(16px); background-color: #fff; }

  /* Info icon tooltip */
  .info-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 16px; height: 16px; border-radius: 50%; font-size: 10px; font-weight: 700;
    font-style: italic; background: var(--surface); color: var(--text-dim);
    border: 1px solid var(--border); cursor: help; position: relative;
    vertical-align: middle; margin-left: 4px; line-height: 1;
  }
  .info-icon:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
  .info-icon:hover::after {
    content: attr(title); position: absolute; bottom: 130%; left: 50%; transform: translateX(-50%);
    background: var(--surface); color: var(--text); border: 1px solid var(--border);
    border-radius: 6px; padding: 8px 12px; font-size: 0.75rem; font-style: normal;
    font-weight: 400; white-space: normal; width: 240px; z-index: 100;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4); line-height: 1.4;
  }
  .info-icon:hover::before {
    content: ''; position: absolute; bottom: 120%; left: 50%; transform: translateX(-50%);
    border: 6px solid transparent; border-top-color: var(--border); z-index: 101;
  }