:root {
      --bg: #080d14;
      --bg-1: #0d1520;
      --bg-2: #111c2c;
      --bg-3: #172236;
      --surface: rgba(255,255,255,.04);
      --surface-h: rgba(255,255,255,.07);
      --border: rgba(255,255,255,.08);
      --border-h: rgba(255,255,255,.14);
      --text: #e8f0fb;
      --text-2: #9fb3cc;
      --text-3: #627a96;
      --accent: #20c3b2;
      --accent-dim: rgba(32,195,178,.12);
      --accent-glow: rgba(32,195,178,.25);
      --accent-2: #3d8ef8;
      --accent-2-dim: rgba(61,142,248,.12);
      --warn: #f0a833;
      --danger: #ef5564;
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 18px;
      --radius-xl: 24px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,.3);
      --shadow: 0 8px 32px rgba(0,0,0,.4);
      --shadow-lg: 0 20px 60px rgba(0,0,0,.5);
      --sidebar-w: 240px;
      --topbar-h: 60px;
      --transition: .2s cubic-bezier(.4,0,.2,1);
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 15px; }
    body {
      background: var(--bg);
      color: var(--text);
      font-family: "Times New Roman", Times, serif;
      line-height: 1.65;
      min-height: 100vh;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }
    input, select, textarea { font-family: inherit; }

    ::-webkit-scrollbar { width: 6px; height: 6px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 99px; }
    ::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.22); }

    .topbar {
      position: fixed;
      inset: 0 0 auto 0;
      z-index: 100;
      height: var(--topbar-h);
      background: rgba(8,13,20,.9);
      backdrop-filter: blur(20px) saturate(1.4);
      -webkit-backdrop-filter: blur(20px) saturate(1.4);
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      padding: 0 20px;
      gap: 16px;
    }
    .topbar-brand {
      display: flex;
      align-items: center;
      gap: .65rem;
      font-weight: 700;
      font-size: 1.15rem;
      letter-spacing: .02em;
      white-space: nowrap;
      padding-right: 16px;
      border-right: 1px solid var(--border);
    }
    .brand-logo {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: 2px solid var(--accent);
      position: relative;
      background: url('../../../../../Logo.png') center/cover no-repeat;
      flex-shrink: 0;
    }
    .brand-logo svg { display: none; }
    .topbar-brand > span {
      background: linear-gradient(135deg, #e8d080, var(--accent), #c8a828);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .topbar-breadcrumb {
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--text-3);
      font-size: 12.5px;
      font-weight: 500;
      flex: 1;
      overflow: hidden;
    }
    .topbar-breadcrumb .sep { opacity: .4; }
    .topbar-breadcrumb .current { color: var(--text-2); }

    .topbar-actions {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: auto;
    }
    .btn-ghost {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 12px;
      border-radius: var(--radius-sm);
      font-size: 12.5px;
      font-weight: 600;
      color: var(--text-2);
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .btn-ghost:hover {
      color: var(--text);
      background: var(--surface-h);
      border-color: var(--border-h);
    }
    .btn-ghost svg { width: 14px; height: 14px; }

    .sidebar-toggle {
      display: none;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      color: var(--text-2);
      transition: var(--transition);
    }
    .sidebar-toggle:hover { background: var(--surface-h); color: var(--text); }
    .sidebar-toggle svg { width: 16px; height: 16px; }

    .app-shell {
      display: flex;
      padding-top: var(--topbar-h);
      min-height: 100vh;
    }

    .sidebar {
      position: fixed;
      top: var(--topbar-h);
      left: 0;
      bottom: 0;
      width: var(--sidebar-w);
      background: var(--bg-1);
      border-right: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      z-index: 50;
      transition: transform var(--transition);
      overflow: hidden;
    }
    .sidebar.hidden { transform: translateX(-100%); }

    .sidebar-header {
      padding: 16px 16px 10px;
      border-bottom: 1px solid var(--border);
    }
    .sidebar-label {
      font-size: 10px;
      font-weight: 700;
      letter-spacing: .1em;
      text-transform: uppercase;
      color: var(--text-3);
    }

    .sidebar-meta {
      padding: 10px 16px;
      border-bottom: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .meta-tag {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 11px;
      color: var(--text-3);
    }
    .meta-tag svg { width: 11px; height: 11px; opacity: .7; }

    .sidebar-nav {
      flex: 1;
      overflow-y: auto;
      padding: 8px 8px;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 10px;
      width: 100%;
      padding: 9px 10px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 500;
      color: var(--text-2);
      transition: var(--transition);
      text-align: left;
      border: 1px solid transparent;
      position: relative;
    }
    .nav-item:hover { color: var(--text); background: var(--surface); }
    .nav-item.active {
      color: var(--text);
      background: var(--accent-dim);
      border-color: rgba(32,195,178,.2);
    }
    .nav-item.active::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 3px;
      height: 60%;
      background: var(--accent);
      border-radius: 0 3px 3px 0;
    }
    .nav-icon {
      width: 28px;
      height: 28px;
      border-radius: 7px;
      display: grid;
      place-items: center;
      flex-shrink: 0;
      background: var(--surface);
      font-size: 11px;
      font-weight: 800;
      color: var(--text-3);
      transition: var(--transition);
    }
    .nav-item.active .nav-icon {
      background: var(--accent-dim);
      color: var(--accent);
    }
    .nav-icon svg { width: 13px; height: 13px; }
    .nav-text { flex: 1; }
    .nav-badge {
      font-size: 10px;
      padding: 2px 6px;
      border-radius: 99px;
      background: var(--accent-dim);
      color: var(--accent);
      font-weight: 700;
    }

    .sidebar-footer {
      padding: 12px 16px;
      border-top: 1px solid var(--border);
      font-size: 11px;
      color: var(--text-3);
    }
    .sidebar-footer a:hover { color: var(--accent); }

    .main {
      margin-left: var(--sidebar-w);
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
    }

    .hero {
      padding: 40px 40px 32px;
      border-bottom: 1px solid var(--border);
      background: linear-gradient(180deg, rgba(32,195,178,.04) 0%, transparent 100%);
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 12px;
      border-radius: 99px;
      font-size: 10.5px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
      color: var(--accent);
      background: var(--accent-dim);
      border: 1px solid rgba(32,195,178,.22);
      margin-bottom: 14px;
    }
    .eyebrow svg { width: 11px; height: 11px; }

    .hero h1 {
      font-size: clamp(1.5rem, 3vw, 2.4rem);
      font-weight: 800;
      letter-spacing: -.04em;
      line-height: 1.1;
      margin-bottom: 10px;
    }
    .hero h1 em {
      font-style: normal;
      background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      color: var(--text-2);
      font-size: 14px;
      max-width: 600px;
      margin-bottom: 18px;
    }
    .hero-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .chip {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 5px 10px;
      border-radius: 99px;
      font-size: 11.5px;
      font-weight: 500;
      color: var(--text-2);
      background: var(--surface);
      border: 1px solid var(--border);
    }
    .chip svg { width: 11px; height: 11px; opacity: .7; }

    .content-area {
      flex: 1;
      padding: 32px 40px 60px;
    }

    .section-panel {
      display: none;
      animation: fadeSlideIn .25s ease both;
    }
    .section-panel.active { display: block; }

    @keyframes fadeSlideIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .section-title-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border);
    }
    .section-icon-wrap {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      background: var(--accent-dim);
      border: 1px solid rgba(32,195,178,.22);
      flex-shrink: 0;
    }
    .section-icon-wrap svg { width: 18px; height: 18px; color: var(--accent); }
    .section-title-row h2 {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -.03em;
    }
    .section-badge {
      margin-left: auto;
      font-size: 11px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 99px;
      background: var(--surface);
      color: var(--text-3);
      border: 1px solid var(--border);
    }

    .card {
      background: var(--bg-2);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .card + .card { margin-top: 16px; }

    .info-grid {
      display: grid;
      gap: 12px;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
    .info-grid.single-column {
      grid-template-columns: 1fr;
    }
    .info-grid.stack {
      grid-template-columns: 1fr;
    }
    .objective-grid { grid-template-columns: 1fr; }
    .math-display {
      margin: 16px 0;
      text-align: center;
      font-family: "Trebuchet MS", Arial, sans-serif;
    }
    .formula, .calc-formula { font-family: "Trebuchet MS", Arial, sans-serif; }
    .formula-img {
      display: block;
      margin: 16px auto;
      max-width: 90%;
      height: auto;
    }
    .info-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 16px;
    }
    .info-box h3 {
      font-size: .95rem;
      margin-bottom: 6px;
      color: var(--text);
    }
    .info-box p, .info-box ul, .info-box ol {
      font-size: .9rem;
      color: var(--text-2);
    }
    .info-box ul, .info-box ol { padding-left: 18px; }
    .info-box li + li { margin-top: 6px; }
    .learning-toggle {
      display: inline-flex;
      gap: 4px;
      padding: 4px;
      margin: 4px 0 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg-1);
    }
    .learning-toggle button {
      padding: 7px 10px;
      border-radius: 6px;
      color: var(--text-2);
      font-size: .78rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .learning-toggle button:hover { color: var(--text); background: var(--surface-h); }
    .learning-toggle button.active { color: var(--bg); background: var(--accent); }
    .learning-objectives-panel[hidden] { display: none; }

    .procedure-toggle {
      display: inline-flex;
      gap: 4px;
      padding: 4px;
      margin: 4px 0 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg-1);
    }
    .procedure-toggle button {
      padding: 7px 10px;
      border-radius: 6px;
      color: var(--text-2);
      font-size: .78rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .procedure-toggle button:hover { color: var(--text); background: var(--surface-h); }
    .procedure-toggle button.active { color: var(--bg); background: var(--accent); }
    .procedure-panel[hidden] { display: none; }

    .tip {
      display: flex;
      gap: 12px;
      padding: 14px 16px;
      border-radius: var(--radius);
      background: var(--accent-dim);
      border: 1px solid rgba(32,195,178,.2);
      border-left: 3px solid var(--accent);
      margin-top: 16px;
    }
    .tip-icon { color: var(--accent); flex-shrink: 0; margin-top: 1px; }
    .tip-icon svg { width: 15px; height: 15px; }
    .tip-body { font-size: 13px; color: var(--text-2); }
    .tip-body strong { color: var(--text); font-weight: 600; }

    .sim-wrapper {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      background: #030710;
      box-shadow: var(--shadow-lg), 0 0 0 1px rgba(32,195,178,.06);
    }
    .sim-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 16px;
      background: var(--bg-2);
      border-bottom: 1px solid var(--border);
    }
    .sim-toolbar-left {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .sim-status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 8px var(--accent-glow);
      animation: pulse 2s ease infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: .5; }
    }
    .sim-status-text { font-size: 12px; font-weight: 600; color: var(--text-2); }
    .sim-toolbar-right { display: flex; align-items: center; gap: 6px; }

    .sim-selection {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin: 14px 0 16px;
    }

    .sim-select-btn {
      border: 1px solid var(--border);
      border-radius: 999px;
      background: var(--surface);
      color: var(--text);
      padding: 10px 14px;
      cursor: pointer;
      font-size: 0.92rem;
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .sim-select-btn.active,
    .sim-select-btn:hover {
      background: rgba(20, 184, 166, 0.12);
      border-color: var(--accent);
      color: var(--accent);
    }

    .btn-icon {
      width: 32px;
      height: 32px;
      border-radius: var(--radius-sm);
      display: grid;
      place-items: center;
      color: var(--text-2);
      border: 1px solid var(--border);
      background: var(--surface);
      transition: var(--transition);
    }
    .btn-icon:hover { color: var(--text); background: var(--surface-h); border-color: var(--border-h); }
    .btn-icon svg { width: 14px; height: 14px; }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 14px;
      border-radius: var(--radius-sm);
      font-size: 12.5px;
      font-weight: 600;
      color: #030710;
      background: var(--accent);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .btn-primary:hover { background: #25dac8; box-shadow: 0 0 20px var(--accent-glow); }
    .btn-primary svg { width: 13px; height: 13px; }

    #ggb-element {
      width: 100%;
      height: 660px;
      display: block;
      background: #030710;
    }
    #ggb-element > div { width: 100% !important; height: 100% !important; }

    .sim-wrapper.fullscreen {
      position: fixed;
      inset: 0;
      z-index: 200;
      border-radius: 0;
      border: none;
      background: #030710;
    }
    .sim-wrapper.fullscreen #ggb-element {
      width: 100%;
      height: calc(100vh - 53px);
    }

    .obs-links {
      display: grid;
      gap: 12px;
      margin-bottom: 16px;
    }

    .obs-link-btn {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      box-sizing: border-box;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: var(--surface);
      color: var(--text);
      padding: 12px 14px;
      cursor: pointer;
      font-size: 1rem;
      text-align: left;
      transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .obs-link-btn:hover {
      transform: translateY(-1px);
      border-color: var(--accent);
      box-shadow: 0 6px 16px rgba(11, 74, 152, 0.12);
    }

    .obs-link-btn strong {
      color: var(--accent);
    }

    .obs-table-item {
      display: grid;
      gap: 10px;
    }

    .obs-link-btn[aria-expanded="true"] {
      border-color: var(--accent);
      background: rgba(20, 184, 166, 0.06);
      /* Use outline to avoid visual layout shift when activated */
      box-shadow: none;
      outline: 3px solid rgba(20, 184, 166, 0.08);
      outline-offset: -3px;
    }

    .obs-detail-panel {
      display: block;
      padding: 6px;
      border: 1px solid var(--border);
      border-radius: 16px;
      background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(245,249,255,0.95));
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    }

    .obs-detail-panel[hidden] {
      display: none;
    }

    .obs-card {
      margin-top: 16px;
      padding: 16px;
      border: 1px solid var(--border);
      border-radius: 16px;
      background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(245,249,255,0.95));
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    }

    .obs-card[hidden] {
      display: none;
    }

    .obs-card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 12px;
    }

    .obs-card-header h3 {
      margin: 0;
      color: var(--accent);
      font-size: 1.05rem;
    }

    #obs-plot-graph {
      display: none;
    }

    #obs-plot-graph:not([hidden]) {
      display: inline-flex;
    }

    .result-analysis-next-row {
      margin-top: 14px;
      display: flex;
      justify-content: flex-end;
    }

    .calc-panel {
      margin-top: 16px;
      border-radius: 14px;
      border: 1px solid var(--border);
      background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,250,253,.98));
      color: #14213a;
      padding: 16px;
      box-shadow: 0 12px 30px rgba(0,0,0,.08);
    }

    .calc-panel[hidden] {
      display: none;
    }

    .calc-panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 12px;
    }

    .calc-panel-header h3 {
      font-size: 1rem;
      color: #1a2a3a;
    }

    .calc-panel-actions {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-top: 10px;
    }

    .export-full-pdf-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0.72rem 1.1rem;
      border: 0;
      border-radius: 10px;
      background: linear-gradient(135deg, #0f766e, #14b8a6);
      color: #fff;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 12px 24px rgba(20, 184, 166, 0.2);
    }

    .calc-ink-wrapper {
      position: relative;
      width: 100%;
      min-height: 160px;
      border-radius: 12px;
      border: 1px solid rgba(32,195,178,.35);
      background: repeating-linear-gradient(135deg, transparent, transparent 2px, rgba(32,195,178,.03) 2px, rgba(32,195,178,.03) 4px);
      overflow: hidden;
    }

    .calc-ink-embed {
      width: 100%;
      min-height: 550px;
      height: 550px;
      display: block;
      border: 0;
      background: transparent;
    }

    .calc-ink-canvas {
      display: none;
    }

    .calc-formula {
      margin-top: 12px;
      font-size: 1rem;
      font-weight: 700;
      color: #0a554c;
      letter-spacing: .01em;
    }

    .calc-answer-row {
      margin-top: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .calc-answer-row span {
      font-size: .95rem;
      font-weight: 700;
      color: #203445;
    }

    @media print {
      body * {
        visibility: hidden !important;
      }

      .print-export-report,
      .print-export-report * {
        visibility: visible !important;
      }

      .print-export-report {
        position: absolute;
        inset: 0;
        padding: 28px 32px;
        background: #fff;
        color: #111827;
        visibility: visible !important;
      }

      .print-export-report h1,
      .print-export-report h2,
      .print-export-report h3,
      .print-export-report p,
      .print-export-report li,
      .print-export-report span,
      .print-export-report strong {
        color: #111827 !important;
      }

      .print-export-report .print-block {
        margin-bottom: 18px;
      }

      .print-export-report img {
        display: block;
        width: 100%;
        max-width: 100%;
        height: auto;
        margin: 12px 0;
        border: 1px solid #d1d5db;
        border-radius: 8px;
        background: #fff;
      }
    }

    .calc-answer-row input {
      min-width: 170px;
      max-width: 240px;
      padding: 9px 12px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: #fff;
      color: #121a24;
      outline: none;
    }

    .calc-answer-row input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(32,195,178,.15);
    }

    .obs-ggb-shell {
      width: 100%;
      border-radius: 12px;
      overflow: hidden;
      background: #fff;
      display: flex;
      justify-content: center;
      align-items: flex-start;
      box-sizing: border-box;
    }

    #obs-ggb-container {
      width: 100%;
      height: 500px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      background: #fff;
      box-sizing: border-box;
    }

    #obs-ggb-host {
      width: 100%;
      height: 100%;
      max-width: 100%;
      margin: 0 auto;
      pointer-events: auto !important;
      touch-action: manipulation !important;
      user-select: text !important;
      overflow: hidden;
      display: block;
      flex: 1 1 auto;
      position: relative;
    }

    #obs-ggb-host > div,
    #obs-ggb-host iframe,
    #obs-ggb-host canvas {
      width: 100% !important;
      max-width: 100% !important;
      height: 100% !important;
      min-width: 0 !important;
    }

    #obs-ggb-host * {
      pointer-events: auto !important;
      touch-action: manipulation !important;
      user-select: text !important;
      overflow: visible;
    }

    .sim-loading {
      position: absolute;
      inset: 53px 0 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 14px;
      background: #030710;
      z-index: 5;
      pointer-events: none;
      transition: opacity .4s ease;
    }
    .sim-loading.hidden { opacity: 0; }
    .spin-ring {
      width: 36px;
      height: 36px;
      border: 2.5px solid rgba(255,255,255,.08);
      border-top-color: var(--accent);
      border-radius: 50%;
      animation: spin .9s linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }
    .sim-loading-text { font-size: 13px; color: var(--text-3); }

    .sim-infobar {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 24px;
      padding: 14px 20px;
      background: var(--bg-2);
      border-top: 1px solid var(--border);
    }
    .sim-info-item {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--text-3);
    }
    .sim-info-item svg { width: 12px; height: 12px; }
    .sim-info-item strong { color: var(--text-2); }

    .footer {
      margin-left: var(--sidebar-w);
      padding: 16px 40px;
      border-top: 1px solid var(--border);
      background: var(--bg-1);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .footer-left { font-size: 12px; color: var(--text-3); }
    .footer-links { display: flex; gap: 16px; }
    .footer-links a { font-size: 12px; color: var(--text-3); transition: var(--transition); }
    .footer-links a:hover { color: var(--accent); }

    .sidebar-overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,.6);
      z-index: 49;
      backdrop-filter: blur(2px);
    }
    .sidebar-overlay.visible { display: block; }

    @media (max-width: 900px) {
      .sidebar { transform: translateX(-100%); }
      .sidebar.open { transform: translateX(0); }
      .sidebar-toggle { display: inline-flex; }
      .main { margin-left: 0; }
      .footer { margin-left: 0; }
      .hero { padding: 28px 24px 24px; }
      .content-area { padding: 24px 24px 48px; }
    }
    @media (max-width: 600px) {
      .hero h1 { font-size: 1.4rem; }
      .topbar-breadcrumb { display: none; }
      #ggb-element { height: 420px; }
      .sim-wrapper.fullscreen #ggb-element { height: calc(100vh - 53px); }
    }
      /* Shared oSimulations brand mark — aligned with index.html */
    .nav-logo .logo-mark,
    .brand-mark,
    .brand-logo,
    .nav-brand .ni,
    .tb-brand .tb-icon,
    .topbar-brand .brand-logo,
    .footer-brand .fi2,
    .fb-brand .fi2 {
      width: 36px !important;
      height: 36px !important;
      border-radius: 50% !important;
      border: 2px solid var(--accent, #e8c45a) !important;
      background: url('../../../../../Logo.png') center/cover no-repeat !important;
      box-shadow: none !important;
    }
    .nav-logo .logo-text,
    .brand-name,
    .nav-brand > span,
    .tb-brand > span,
    .topbar-brand > span,
    .footer-brand > span,
    .fb-brand > span {
      font-size: 1.15rem !important;
      font-weight: 700 !important;
      letter-spacing: .02em !important;
      background: linear-gradient(135deg, #e8d080, var(--accent, #e8c45a), #c8a828) !important;
      -webkit-background-clip: text !important;
      -webkit-text-fill-color: transparent !important;
      background-clip: text !important;
    }
    .nav-logo .logo-mark svg,
    .brand-mark svg,
    .brand-logo svg,
    .nav-brand .ni svg,
    .tb-brand .tb-icon svg,
    .topbar-brand .brand-logo svg,
    .footer-brand .fi2 svg,
    .fb-brand .fi2 svg { display: none !important; }