:root {
    --bg: #f0f2f5;
    --surface: #ffffff;
    --surface-hover: #f7fafc;
    --surface-alt: #edf2f7;

    --border: #e2e8f0;
    --border-strong: #cbd5e0;

    --text: #333333;
    --text-heading: #1a202c;
    --text-strong: #2d3748;
    --text-label: #4a5568;
    --text-muted: #718096;
    --text-faint: #a0aec0;

    --brand: #1a365d;
    --brand-alt: #2d4a7a;

    --primary: #3182ce;
    --primary-hover: #2b6cb0;
    --primary-bg: #ebf8ff;
    --primary-border: #4299e1;
    --primary-ring: rgba(66,153,225,0.15);

    --success: #38a169;
    --success-hover: #2f855a;
    --success-bg: #f0fff4;
    --success-bg-hover: #e6ffed;
    --success-bg-strong: #c6f6d5;
    --success-text: #22543d;
    --success-dot: #48bb78;

    --warning-bg: #fffaf0;
    --warning-bg-strong: #feebc8;
    --warning-text: #c05621;
    --warning-text-alt: #dd6b20;
    --warning-dot: #ecc94b;

    --danger: #e53e3e;
    --danger-bg: #fff5f5;
    --danger-bg-strong: #fed7d7;
    --danger-text: #9b2c2c;
    --danger-dot: #fc8181;

    --info-bg: #bee3f8;
    --info-text: #2b6cb0;
    --log-info: #63b3ed;
    --log-success: #68d391;

    --log-bg: #1a202c;
    --log-text: #a0aec0;

    --btn-neutral-bg: #2d3748;
    --btn-neutral-text: #ffffff;

    --shadow: rgba(0,0,0,0.1);
    --shadow-strong: rgba(0,0,0,0.08);
    --spinner-track: rgba(255,255,255,0.3);
  }

  :root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #14181f;
    --surface: #1e2530;
    --surface-hover: #262e3b;
    --surface-alt: #262e3b;

    --border: #313b4b;
    --border-strong: #46536a;

    --text: #dbe1ea;
    --text-heading: #f5f7fa;
    --text-strong: #e2e8f0;
    --text-label: #c3cddc;
    --text-muted: #93a1b7;
    --text-faint: #6b7889;

    --brand: #0f1f38;
    --brand-alt: #172c4d;

    --primary: #4299e1;
    --primary-hover: #63b3ed;
    --primary-bg: #1c3352;
    --primary-border: #4299e1;
    --primary-ring: rgba(66,153,225,0.25);

    --success: #48bb78;
    --success-hover: #68d391;
    --success-bg: #16281e;
    --success-bg-hover: #1b3324;
    --success-bg-strong: #23543d;
    --success-text: #9ae6b4;
    --success-dot: #48bb78;

    --warning-bg: #2e2415;
    --warning-bg-strong: #4d3b1c;
    --warning-text: #f6ad55;
    --warning-text-alt: #ed8936;
    --warning-dot: #ecc94b;

    --danger: #fc8181;
    --danger-bg: #2e1b1b;
    --danger-bg-strong: #4a2323;
    --danger-text: #feb2b2;
    --danger-dot: #fc8181;

    --info-bg: #1c3a54;
    --info-text: #90cdf4;
    --log-info: #63b3ed;
    --log-success: #68d391;

    --log-bg: #0a0d12;
    --log-text: #94a3b8;

    --shadow: rgba(0,0,0,0.4);
    --shadow-strong: rgba(0,0,0,0.5);
    --spinner-track: rgba(255,255,255,0.15);
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      color-scheme: dark;
      --bg: #14181f;
      --surface: #1e2530;
      --surface-hover: #262e3b;
      --surface-alt: #262e3b;

      --border: #313b4b;
      --border-strong: #46536a;

      --text: #dbe1ea;
      --text-heading: #f5f7fa;
      --text-strong: #e2e8f0;
      --text-label: #c3cddc;
      --text-muted: #93a1b7;
      --text-faint: #6b7889;

      --brand: #0f1f38;
      --brand-alt: #172c4d;

      --primary: #4299e1;
      --primary-hover: #63b3ed;
      --primary-bg: #1c3352;
      --primary-border: #4299e1;
      --primary-ring: rgba(66,153,225,0.25);

      --success: #48bb78;
      --success-hover: #68d391;
      --success-bg: #16281e;
      --success-bg-hover: #1b3324;
      --success-bg-strong: #23543d;
      --success-text: #9ae6b4;
      --success-dot: #48bb78;

      --warning-bg: #2e2415;
      --warning-bg-strong: #4d3b1c;
      --warning-text: #f6ad55;
      --warning-text-alt: #ed8936;
      --warning-dot: #ecc94b;

      --danger: #fc8181;
      --danger-bg: #2e1b1b;
      --danger-bg-strong: #4a2323;
      --danger-text: #feb2b2;
      --danger-dot: #fc8181;

      --info-bg: #1c3a54;
      --info-text: #90cdf4;
      --log-info: #63b3ed;
      --log-success: #68d391;

      --log-bg: #0a0d12;
      --log-text: #94a3b8;

      --shadow: rgba(0,0,0,0.4);
      --shadow-strong: rgba(0,0,0,0.5);
      --spinner-track: rgba(255,255,255,0.15);
    }
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--bg); color: var(--text); }

  .app-shell { display: flex; min-height: 100vh; }
  .sidebar { width: 240px; flex-shrink: 0; background: var(--brand); color: rgba(255,255,255,0.85); display: flex; flex-direction: column; height: 100vh; position: sticky; top: 0; }
  .sidebar-brand { padding: 22px 20px 18px; border-bottom: 1px solid rgba(255,255,255,0.12); }
  .sidebar-brand-name { font-size: 16px; font-weight: 700; color: white; line-height: 1.25; }
  .sidebar-brand-sub { font-size: 12px; color: rgba(255,255,255,0.55); margin-top: 2px; }
  .sidebar-nav { flex: 1; overflow-y: auto; padding: 12px 0; }
  .sidebar-link { display: block; padding: 11px 20px; color: rgba(255,255,255,0.7); text-decoration: none; font-size: 14px; font-weight: 600; border-left: 3px solid transparent; }
  .sidebar-link:hover { background: rgba(255,255,255,0.06); color: white; }
  .sidebar-link.active { background: rgba(255,255,255,0.1); color: white; border-left-color: var(--primary); }
  .sidebar-footer { flex-shrink: 0; border-top: 1px solid rgba(255,255,255,0.12); padding: 12px; display: flex; flex-direction: column; gap: 4px; }
  .sidebar-theme-toggle { background: transparent; border: 1px solid rgba(255,255,255,0.25); color: rgba(255,255,255,0.85); padding: 7px 10px; font-size: 12px; margin-bottom: 6px; width: 100%; }
  .sidebar-theme-toggle:hover { background: rgba(255,255,255,0.08); }
  .sidebar-account { display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 6px; text-decoration: none; color: inherit; }
  .sidebar-account:hover { background: rgba(255,255,255,0.06); }
  .sidebar-avatar { width: 32px; height: 32px; border-radius: 50%; background: rgba(255,255,255,0.15); color: white; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0; background-size: cover; background-position: center; }
  .sidebar-account-info { min-width: 0; }
  .sidebar-account-email { font-size: 12px; font-weight: 600; color: white; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .sidebar-account-version { font-size: 10px; font-family: 'Consolas', monospace; color: rgba(255,255,255,0.45); margin-top: 1px; }
  .sidebar-logout { background: none; border: none; color: rgba(255,255,255,0.55); font-size: 12px; font-weight: 600; cursor: pointer; padding: 8px; text-align: left; }
  .sidebar-logout:hover { color: white; }

  .app-main { flex: 1; min-width: 0; }
  .page-header { padding: 24px 24px 0; }
  .page-header h1 { font-size: 22px; font-weight: 700; color: var(--text-heading); }
  .page-header .subtitle { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

  .sidebar-hamburger { display: none; align-items: center; justify-content: center; padding: 0; line-height: 1; background: none; border: 1px solid rgba(255,255,255,0.3); color: white; width: 34px; height: 34px; border-radius: 6px; font-size: 18px; cursor: pointer; flex-shrink: 0; }
  .sidebar-hamburger:hover { background: rgba(255,255,255,0.1); }

  @media (max-width: 720px) {
    .app-shell { flex-direction: column; position: relative; }
    .sidebar { width: 100%; height: auto; position: relative; z-index: 100; }
    .sidebar-brand { border-bottom: none; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; }
    .sidebar-hamburger { display: flex; }
    .sidebar-nav, .sidebar-footer { display: none; }
    /* Floats over the page (not pushed inline) with a hard shadow edge so
       it's unmistakably a panel on top of the content, not part of the page. */
    .sidebar.menu-open { position: absolute; top: 0; left: 0; right: 0; box-shadow: 0 12px 28px rgba(0,0,0,0.45); }
    .sidebar.menu-open .sidebar-nav { display: flex; flex-direction: column; border-top: 1px solid rgba(255,255,255,0.12); padding: 8px 0; }
    .sidebar.menu-open .sidebar-footer { display: flex; border-bottom: 3px solid var(--primary); }
  }

  .sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90; opacity: 0; transition: opacity 0.15s; }
  .sidebar-backdrop.visible { display: block; opacity: 1; }

  .status-bar { background: var(--brand-alt); color: white; padding: 8px 24px; display: flex; align-items: center; gap: 12px; font-size: 13px; }
  .status-dot { width: 10px; height: 10px; border-radius: 50%; }
  .status-dot.green { background: var(--success-dot); }
  .status-dot.yellow { background: var(--warning-dot); }
  .status-dot.red { background: var(--danger-dot); }

  .container { max-width: 1400px; margin: 24px auto; padding: 0 24px; }

  .card { background: var(--surface); border-radius: 8px; box-shadow: 0 1px 3px var(--shadow); margin-bottom: 16px; overflow: hidden; }
  .card-header { padding: 16px 20px; border-bottom: 1px solid var(--border); font-weight: 600; font-size: 15px; display: flex; align-items: center; justify-content: space-between; }
  .card-body { padding: 20px; }

  .step-number { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; background: var(--brand); color: white; font-size: 13px; font-weight: 700; margin-right: 10px; }
  .step-done .step-number, .step-number.step-done { background: var(--success-dot); }

  .form-row { display: flex; gap: 12px; margin-bottom: 12px; }
  .form-group { flex: 1; }
  .form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--text-label); }
  .form-group input:not([type="checkbox"]):not([type="radio"]), .form-group select { width: 100%; padding: 8px 12px; border: 1px solid var(--border-strong); border-radius: 6px; font-size: 14px; background: var(--surface); color: var(--text); }
  .form-group input:not([type="checkbox"]):not([type="radio"]):focus, .form-group select:focus { outline: none; border-color: var(--primary-border); box-shadow: 0 0 0 3px var(--primary-ring); }

  button, .btn-primary, .btn-success, .btn-outline {
    display: inline-block; padding: 10px 20px; border: none; border-radius: 6px;
    font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.15s;
    text-decoration: none; text-align: center; box-sizing: border-box;
  }
  button:disabled { opacity: 0.5; cursor: not-allowed; }
  .btn-primary { background: var(--primary); color: white; }
  .btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
  .btn-success { background: var(--success); color: white; }
  .btn-success:hover:not(:disabled) { background: var(--success-hover); }
  .btn-outline { background: transparent; border: 1px solid var(--border-strong); color: var(--text-label); }
  .btn-outline:hover:not(:disabled) { background: var(--surface-hover); }

  .member-list { list-style: none; }
  .member-item { padding: 12px 16px; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 8px; cursor: pointer; transition: all 0.15s; display: flex; justify-content: space-between; align-items: center; }
  .member-item:hover { border-color: var(--primary-border); background: var(--primary-bg); }
  .member-item.selected { border-color: var(--primary); background: var(--primary-bg); }
  .member-name { font-weight: 600; }
  .member-detail { font-size: 13px; color: var(--text-muted); }

  .eligibility-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .elig-item { padding: 10px 14px; border-radius: 6px; font-size: 13px; display: flex; justify-content: space-between; }
  .elig-yes { background: var(--success-bg); border: 1px solid var(--success-bg-strong); }
  .elig-no { background: var(--warning-bg); border: 1px solid var(--warning-bg-strong); }

  .auth-result { background: var(--success-bg); border: 2px solid var(--success-dot); border-radius: 8px; padding: 20px; text-align: center; }
  .auth-number { font-size: 28px; font-weight: 700; color: var(--success-text); margin: 8px 0; }

  .pdf-links { display: flex; gap: 12px; margin-top: 16px; justify-content: center; }
  .pdf-link { padding: 10px 20px; background: var(--btn-neutral-bg); color: var(--btn-neutral-text); border-radius: 6px; text-decoration: none; font-size: 14px; }

  .log { background: var(--log-bg); color: var(--log-text); font-family: 'Consolas', monospace; font-size: 12px; padding: 16px; border-radius: 6px; max-height: 200px; overflow-y: auto; white-space: pre-wrap; margin-top: 12px; }
  .log .error { color: var(--danger-dot); }
  .log .success { color: var(--log-success); }
  .log .info { color: var(--log-info); }

  .hidden { display: none; }
  .spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--spinner-track); border-top-color: white; border-radius: 50%; animation: spin 0.6s linear infinite; margin-right: 8px; vertical-align: middle; }
  @keyframes spin { to { transform: rotate(360deg); } }

  .action-bar { display: flex; gap: 12px; align-items: center; margin-top: 12px; }

  .vsp-badge { display: inline-block; background: var(--success); color: white; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 700; }
  .date-nav { display: flex; gap: 8px; align-items: center; }
  .date-nav button { padding: 4px 12px; font-size: 12px; }

  .appt-grid { display: flex; gap: 12px; overflow-x: auto; padding: 16px; align-items: flex-start; }
  .day-column { flex: 1 1 210px; min-width: 210px; max-width: 260px; }
  .day-column-header { display: flex; align-items: center; justify-content: space-between; gap: 6px; padding: 8px 10px; background: var(--surface-alt); border-radius: 6px; font-weight: 600; font-size: 13px; color: var(--text-strong); margin-bottom: 10px; position: sticky; top: 0; }
  .appt-tile { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; transition: border-color 0.15s, box-shadow 0.15s; }
  .appt-tile:hover { border-color: var(--border-strong); box-shadow: 0 2px 6px var(--shadow-strong); }
  .appt-tile.vsp { border-left: 3px solid var(--success); background: var(--success-bg); }
  .appt-tile.vsp:hover { background: var(--success-bg-hover); }
  .appt-tile-time { font-size: 11px; font-weight: 700; color: var(--text-label); letter-spacing: 0.02em; margin-bottom: 4px; }
  .appt-tile-name { font-size: 14px; font-weight: 600; color: var(--text-heading); margin-bottom: 6px; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
  .appt-tile-meta { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; display: flex; flex-direction: column; gap: 2px; }
  .appt-tile-subtype { display: inline-block; background: var(--surface-alt); color: var(--text-label); padding: 2px 8px; border-radius: 10px; font-size: 10px; font-weight: 600; margin-bottom: 8px; }
  .appt-tile-actions { display: flex; flex-direction: column; gap: 6px; }
  .appt-tile-action { display: block; width: 100%; padding: 6px; font-size: 12px; }
  .appt-empty-day { font-size: 12px; color: var(--text-faint); text-align: center; padding: 24px 8px; font-style: italic; }
  .appt-notes { margin-top: 8px; padding: 8px 10px; background: var(--surface-alt); border-radius: 6px; font-size: 12px; color: var(--text); }
  .appt-note-item { padding: 2px 0; }
  .appt-note-item + .appt-note-item { border-top: 1px solid var(--border); margin-top: 4px; padding-top: 4px; }
  .appt-note-empty { color: var(--text-muted); font-style: italic; }

  .batch-table { width: 100%; border-collapse: collapse; font-size: 12px; margin-top: 12px; }
  .batch-table th { text-align: left; padding: 6px 8px; border-bottom: 2px solid var(--border); color: var(--text-label); font-size: 11px; text-transform: uppercase; }
  .batch-table td { padding: 6px 8px; border-bottom: 1px solid var(--surface-alt); }
  .status-badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 700; }
  .status-authorized { background: var(--success-bg-strong); color: var(--success-text); }
  .status-already_authorized { background: var(--warning-bg-strong); color: var(--warning-text); }
  .status-not_vsp { background: var(--border); color: var(--text-label); }
  .status-no_match { background: var(--danger-bg-strong); color: var(--danger-text); }
  .status-error { background: var(--danger-bg-strong); color: var(--danger-text); }
  .status-pending { background: var(--border); color: var(--text-muted); }
  .status-processing { background: var(--info-bg); color: var(--info-text); }
  .status-cancelled { background: var(--border); color: var(--text-muted); }
  .summary-cards { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 16px; }
  .summary-card { padding: 10px 16px; border-radius: 6px; text-align: center; min-width: 80px; }
  .summary-card .num { font-size: 24px; font-weight: 700; }
  .summary-card .lbl { font-size: 11px; }

  .auth-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
  .auth-card { width: 100%; max-width: 380px; }
  .auth-card h1 { font-size: 20px; font-weight: 700; color: var(--text-heading); margin-bottom: 6px; text-align: center; }
  .auth-card .auth-sub { font-size: 13px; color: var(--text-muted); text-align: center; margin-bottom: 24px; }
  .auth-card .form-group { margin-bottom: 14px; }
  .auth-card button[type="submit"] { width: 100%; margin-top: 6px; }
  .auth-links { text-align: center; margin-top: 18px; font-size: 13px; }
  .auth-links a { color: var(--primary); text-decoration: none; }
  .auth-links a:hover { text-decoration: underline; }
  .auth-error { background: var(--danger-bg); border: 1px solid var(--danger-bg-strong); color: var(--danger-text); padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 14px; }
  .auth-success { background: var(--success-bg); border: 1px solid var(--success-bg-strong); color: var(--success-text); padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 14px; }

  .stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
  .stat-tile { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 18px 20px; }
  .stat-tile .stat-num { font-size: 30px; font-weight: 700; color: var(--text-heading); line-height: 1.1; }
  .stat-tile .stat-lbl { font-size: 12px; color: var(--text-muted); margin-top: 6px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
  .stat-tile.accent .stat-num { color: var(--success); }

  .placeholder-card { background: var(--surface); border: 1px dashed var(--border-strong); border-radius: 8px; padding: 18px 20px; opacity: 0.7; }
  .placeholder-card .stat-lbl { display: flex; align-items: center; justify-content: space-between; }
  .coming-soon-badge { display: inline-block; background: var(--surface-alt); color: var(--text-faint); padding: 1px 7px; border-radius: 8px; font-size: 9px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; }
  .placeholder-card .stat-num { color: var(--text-faint); }

  .bar-chart { display: flex; align-items: flex-end; gap: 6px; height: 140px; padding-top: 10px; }
  .bar-chart .bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 6px; }
  .bar-chart .bar { width: 100%; max-width: 28px; border-radius: 4px 4px 0 0; background: var(--primary); min-height: 2px; transition: opacity 0.1s; }
  .bar-chart .bar:hover { opacity: 0.85; }
  .bar-chart .bar-label { font-size: 10px; color: var(--text-faint); white-space: nowrap; }
  .bar-chart .bar-value { font-size: 10px; font-weight: 600; color: var(--text-muted); white-space: nowrap; }

  .drill-tile { cursor: pointer; transition: border-color 0.15s, box-shadow 0.15s; }
  .drill-tile:hover { border-color: var(--primary-border); box-shadow: 0 2px 8px var(--shadow-strong); }
  .drill-row { cursor: pointer; }
  .drill-row:hover td { background: var(--surface-hover); }

  .modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 24px; }
  .modal-overlay.hidden { display: none; }
  .modal-box { background: var(--surface); border-radius: 10px; box-shadow: 0 10px 40px var(--shadow-strong); max-width: 760px; width: 100%; max-height: 80vh; display: flex; flex-direction: column; overflow: hidden; }
  .modal-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
  .modal-title { font-weight: 700; font-size: 16px; color: var(--text-heading); }
  .modal-subtitle { font-size: 12px; color: var(--text-muted); margin-top: 3px; font-weight: 500; }
  .modal-close { background: none; border: none; font-size: 22px; line-height: 1; color: var(--text-muted); cursor: pointer; padding: 2px 6px; flex-shrink: 0; }
  .modal-close:hover { color: var(--text); }
  .modal-body { padding: 8px 20px 20px; overflow-y: auto; }
  .modal-empty { color: var(--text-muted); font-size: 13px; text-align: center; padding: 24px; }