body { padding: 0; margin: 0; }

    /* ── Header hamburger ── */
    .rb-header-actions { position: relative; }
    .hdr-ham {
      display: none; flex-direction: column; justify-content: center; align-items: center; gap: 5px;
      width: 38px; height: 38px; padding: 8px; box-sizing: border-box;
      background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.22);
      border-radius: 6px; cursor: pointer; transition: background 0.15s;
    }
    .hdr-ham:hover { background: rgba(255,255,255,0.18); }
    .hdr-ham span { display: block; width: 18px; height: 2px; background: #d0e4f0; border-radius: 2px; }
    /* Wide screens: nav always visible inline */
    .hdr-nav { display: flex; }
    .hdr-nav .btn-home { display: block; }
    /* Narrow screens: hamburger + dropdown */
    @media (max-width: 1199px) {
      .hdr-ham { display: flex; }
      .hdr-nav {
        display: none; position: absolute; top: calc(100% + 8px); right: 0;
        background: #1a2938; border: 1px solid rgba(255,255,255,0.14); border-radius: 8px;
        padding: 8px; min-width: 160px; z-index: 200;
        box-shadow: 0 4px 24px rgba(0,0,0,0.45);
        flex-direction: column; gap: 4px;
      }
      .hdr-nav.open { display: flex; }
      .hdr-nav .btn-home { width: 100%; text-align: left; }
    }

    .tdv-content {
      padding: 32px 28px 48px;
      background: var(--color-bg-light);
      min-height: calc(100vh - 85px - 90px);
      box-sizing: border-box;
      width: 100%;
    }

    .tdv-section-header { text-align: center; margin-bottom: 15px; }
    .tdv-section-header h2 {
      color: var(--color-primary-dark); font-size: 24px;
      text-transform: uppercase; letter-spacing: 0.06em;
      margin-bottom: 8px; padding-bottom: 10px;
      border-bottom: 3px solid var(--color-accent-teal); display: inline-block;
    }
    .tdv-section-header p {
      color: var(--color-medium-text); font-size: 14px;
      max-width: 720px; margin: 10px auto 0; line-height: 1.6;
    }

    /* ── Tabs (shared by 3D and 2D) ── */
    .tdv-tabs {
      display: flex; gap: 6px; margin-bottom: 24px;
      border-bottom: 2px solid var(--color-bg-gray-light); padding-bottom: 0;
    }
    .tdv-tab,
    .tdv2-tab {
      padding: 10px 26px; border: none; background: transparent;
      color: var(--color-medium-text);
      font-family: 'Klavika', Arial, sans-serif; font-size: 14px;
      font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
      cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px;
      transition: all 0.2s;
    }
    .tdv-tab:hover,
    .tdv2-tab:hover  { color: var(--color-primary-dark); }
    .tdv-tab.active,
    .tdv2-tab.active { color: var(--color-primary-dark); border-bottom-color: var(--color-primary-dark); }
    .tdv-panel { display: none; }
    .tdv-panel.active { display: block; }

    /* ── Two-column layout ── */
    .tdv-layout {
      display: grid; grid-template-columns: 300px 1fr;
      gap: 24px; align-items: start;
    }

    /* ── Filter Panel ── */
    .tdv-filters {
      background: var(--color-bg-white);
      border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-bg-gray-light);
      padding: 22px 18px; position: sticky; top: 96px;
    }
    .tdv-filters h3 {
      font-size: 14px; text-transform: uppercase; letter-spacing: 0.1em;
      color: var(--color-neutral-gray); margin: 0 0 16px;
      padding-bottom: 8px; border-bottom: 2px solid var(--color-bg-gray-light);
    }
    .filter-row { margin-bottom: 18px; }
    .filter-row.hidden { display: none; }
    .filter-row-label {
      font-size: 14px; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.07em; color: var(--color-primary-dark); margin-bottom: 7px;
    }
    .filter-chips { display: flex; flex-wrap: wrap; gap: 6px; }
    .chip {
      padding: 5px 13px; border-radius: 20px;
      border: 1.5px solid var(--color-neutral-gray);
      background: transparent; color: var(--color-dark-text);
      font-size: 14px; font-weight: 600;
      font-family: 'Panton', Arial, sans-serif;
      cursor: pointer; transition: all 0.18s; line-height: 1.4;
    }
    .chip:hover:not(.disabled):not(.active) {
      border-color: var(--color-primary-dark); color: var(--color-primary-dark);
      background: var(--color-bg-blue-light);
    }
    .chip.active {
      background: var(--color-primary-dark);
      border-color: var(--color-primary-dark); color: #fff;
    }
    .chip.disabled { opacity: 0.3; cursor: not-allowed; pointer-events: none; }
    .chip-note { font-size: 14px; opacity: 0.7; margin-left: 3px; }

    .npe-axle-note {
      font-size: 14px; color: var(--color-medium-text);
      background: var(--color-bg-blue-light);
      border-left: 3px solid var(--color-accent-teal);
      padding: 6px 10px; border-radius: var(--border-radius-sm);
      margin: -4px 0 14px; line-height: 1.5;
    }
    .npe-axle-note strong { color: var(--color-primary-dark); }

    .btn-reset {
      width: 100%; margin-top: 6px; padding: 8px;
      border: 1.5px dashed var(--color-neutral-gray);
      border-radius: var(--border-radius-sm); background: transparent;
      color: var(--color-neutral-gray); font-size: 14px; font-weight: 600;
      cursor: pointer; transition: all 0.2s; text-transform: uppercase; letter-spacing: 0.05em;
    }
    .btn-reset:hover { border-color: var(--color-accent-orange); color: var(--color-accent-orange); }

    /* ── Preview Panel ── */
    .tdv-preview { display: flex; flex-direction: column; gap: 16px; min-width: 0; width: 100%; }

    .tdv-status {
      background: var(--color-bg-white); border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-bg-gray-light); padding: 22px 24px;
    }
    .tdv-status-empty { text-align: center; padding: 48px 24px; }
    .tdv-status-empty .empty-icon { font-size: 56px; margin-bottom: 16px; opacity: 0.35; }
    .tdv-status-empty p { color: var(--color-neutral-gray); font-size: 14px; line-height: 1.6; }
    .tdv-status-empty p strong { color: var(--color-medium-text); }

    .tdv-match-count {
      display: flex; align-items: center; gap: 12px; padding: 14px 18px;
      background: var(--color-bg-blue-light); border-radius: var(--border-radius-md);
      border-left: 4px solid var(--color-primary-dark);
    }
    .tdv-match-count .count-num { font-size: 2em; font-weight: 700; color: var(--color-primary-dark); line-height: 1; }
    .tdv-match-count .count-label { color: var(--color-medium-text); font-size: 14px; line-height: 1.4; }

    /* Coming-soon notice */
    .tdv-coming-soon {
      background: var(--color-bg-yellow-light);
      border: 2px solid var(--color-accent-yellow);
      border-radius: var(--border-radius-lg); padding: 28px 24px; text-align: center;
    }
    .tdv-coming-soon .cs-icon { font-size: 40px; margin-bottom: 10px; }
    .tdv-coming-soon h4 { color: var(--color-dark-text); font-size: 16px; margin-bottom: 8px; }
    .tdv-coming-soon p { color: var(--color-medium-text); font-size: 14px; line-height: 1.6; margin-bottom: 0; }
    .tdv-coming-soon .cs-note { font-size: 14px; color: var(--color-neutral-gray); margin-top: 10px; }

    /* Model info card */
    .tdv-model-info {
      background: var(--color-bg-white); border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-accent-teal); padding: 10px 12px;
    }
    .tdv-model-info .info-top {
      display: flex; justify-content: space-between; align-items: flex-start;
      gap: 12px; margin-bottom: 14px;
    }
    .tdv-model-info .info-code { font-size: 18px; font-weight: 700; color: var(--color-primary-dark); letter-spacing: 0.04em; }
    .tdv-model-info .info-type-badge {
      padding: 4px 12px; border-radius: 20px; font-size: 14px;
      font-weight: 700; letter-spacing: 0.06em;
      background: linear-gradient(135deg, var(--color-accent-teal), var(--color-teal-dark)); color: #fff;
    }
    .tdv-model-info .info-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; margin-bottom: 16px;
    }
    .tdv-model-info .info-item { display: flex; flex-direction: column; gap: 2px; }
    .tdv-model-info .lbl { font-size: 14px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--color-neutral-gray); font-weight: 600; }
    .tdv-model-info .val { font-size: 14px; font-weight: 600; color: var(--color-dark-text); }
    .tdv-model-info .info-filename {
      font-size: 14px; color: var(--color-neutral-gray);
      background: var(--color-bg-light); padding: 7px 10px;
      border-radius: var(--border-radius-sm); font-family: 'Courier New', monospace;
      word-break: break-all; margin-bottom: 14px;
    }
    .btn-download {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 12px 28px; border-radius: var(--border-radius-md);
      background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary-medium));
      color: #fff; font-family: 'Klavika', Arial, sans-serif;
      font-size: 14px; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.07em; text-decoration: none; transition: all 0.2s;
      border: none; cursor: pointer;
    }
    .btn-download:hover { transform: translateY(-2px); box-shadow: 0 6px 18px #8996a0; }

    /* 3D Viewer */
    .tdv-viewer-card {
      background: var(--color-bg-white); border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-bg-gray-light); overflow: hidden;
      position: relative; width: 100%; max-width: 100%; box-sizing: border-box;
    }
    .tdv-viewer-card .viewer-header {
      padding: 12px 18px;
      background: linear-gradient(90deg, var(--color-primary-dark), var(--color-primary-medium));
      color: #fff; font-size: 14px; font-weight: 700;
      text-transform: uppercase; letter-spacing: 0.07em;
      display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    }
    .viewer-stage { position: relative; overflow: hidden; }
    #ov-container,
    #pmg-ov-container,
    #por-ov-container { width: 100%; height: calc(100vh - 460px); min-height: 520px; }
    .viewer-error {
      width: 100%; height: calc(100vh - 460px); min-height: 520px; background: #1a2732;
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      color: rgba(255,255,255,0.55); gap: 10px;
      font-size: 14px; padding: 24px; text-align: center;
    }
    .viewer-error .err-icon { font-size: 40px; }

    /* ── Viewer toolbar ── */
    .viewer-toolbar {
      display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
      margin-left: auto;
    }
    .vtb-btn {
      display: inline-flex; align-items: center; gap: 5px;
      padding: 5px 12px; border-radius: 6px;
      border: 1px solid rgba(255,255,255,0.18);
      background: rgba(255,255,255,0.06);
      color: rgba(255,255,255,0.65);
      font-size: 14px; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.07em; cursor: pointer; transition: all 0.15s; white-space: nowrap;
    }
    .vtb-btn:hover { background: rgba(255,255,255,0.13); color: #fff; border-color: rgba(255,255,255,0.35); }
    .vtb-btn.active { background: rgba(0,180,210,0.22); color: #36cfe0; border-color: rgba(0,180,210,0.55); }

    /* ── Axes gizmo ── */
    #axes-gizmo,
    #pmg-axes-gizmo,
    #por-axes-gizmo {
      position: absolute; bottom: 14px; right: 14px;
      width: 80px; height: 80px; display: none; z-index: 10;
      border-radius: 50%; cursor: pointer;
    }

    /* ── Progress overlay ── */
    .viewer-progress-overlay {
      position: absolute; inset: 0;
      background: #1a2732;
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      gap: 13px; z-index: 25;
      transition: opacity 0.55s ease;
    }
    .viewer-progress-overlay.vp-fading { opacity: 0; pointer-events: none; }
    .vp-filename {
      color: rgba(255,255,255,0.65); font-size: 14px;
      font-family: 'Courier New', monospace;
      max-width: 340px; text-align: center;
      overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    }
    .vp-bar-track {
      width: min(300px, 80%); height: 3px;
      background: rgba(255,255,255,0.1); border-radius: 2px; overflow: hidden;
    }
    .vp-bar-fill {
      height: 100%; width: 0%;
      background: linear-gradient(90deg, var(--color-blue-deep), var(--color-accent-teal), #00d4e8);
      border-radius: 2px;
      transition: width 0.28s ease;
    }
    @keyframes vp-pulse { 0%,100%{opacity:1} 50%{opacity:0.45} }
    .vp-bar-fill.vp-pulsing { animation: vp-pulse 1.6s ease-in-out infinite; }
    .vp-percent {
      color: rgba(255,255,255,0.3); font-size: 14px;
      font-family: 'Courier New', monospace; letter-spacing: 0.06em;
    }

    /* ── AVR cards ── */
    .avr-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
    .avr-card {
      background: var(--color-bg-white); border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-neutral-gray); padding: 24px 20px;
      display: flex; flex-direction: column; gap: 10px; transition: all 0.25s;
    }
    .avr-card:hover {
      border-color: var(--color-blue-deep); transform: translateY(-4px);
      box-shadow: 0 10px 28px rgba(0,124,146,0.18);
    }
    .avr-card .avr-icon {
      width: 52px; height: 52px; border-radius: 50%;
      display: flex; align-items: center; justify-content: center; font-size: 24px;
      background: linear-gradient(135deg, var(--color-blue-deep), var(--color-primary-dark)); color: #fff;
    }
    .avr-card h4 { font-size: 16px; font-weight: 700; color: var(--color-primary-dark); text-transform: uppercase; letter-spacing: 0.04em; margin: 0; }
    .avr-card p { font-size: 14px; color: var(--color-medium-text); line-height: 1.5; margin: 0; flex: 1; }
    .avr-card .avr-badges { display: flex; gap: 6px; flex-wrap: wrap; }
    .badge-step { padding: 3px 9px; border-radius: 12px; font-size: 14px; font-weight: 700; letter-spacing: 0.05em; background: linear-gradient(135deg, var(--color-accent-teal), var(--color-teal-dark)); color: #fff; }
    .badge-zip  { padding: 3px 9px; border-radius: 12px; font-size: 14px; font-weight: 700; letter-spacing: 0.05em; background: linear-gradient(135deg, var(--color-accent-orange), var(--color-accent-yellow)); color: #fff; }
    .avr-card .avr-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
    .btn-avr-dl {
      flex: 1; min-width: 90px; padding: 9px 12px; border-radius: var(--border-radius-sm);
      text-align: center; font-size: 14px; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.05em; text-decoration: none; transition: all 0.2s;
      display: inline-flex; align-items: center; justify-content: center; gap: 5px;
    }
    .btn-avr-dl.primary { background: linear-gradient(135deg, var(--color-blue-deep), var(--color-primary-dark)); color: #fff; }
    .btn-avr-dl.primary:hover { box-shadow: 0 4px 14px rgba(0,124,146,0.4); transform: translateY(-2px); }
    .btn-avr-dl.secondary { border: 1.5px solid var(--color-neutral-gray); color: var(--color-medium-text); background: transparent; }
    .btn-avr-dl.secondary:hover { border-color: var(--color-primary-dark); color: var(--color-primary-dark); background: var(--color-bg-blue-light); }

    /* ── Responsive ── */
    @media (max-width: 1024px) {
      .tdv-layout { grid-template-columns: 1fr; }
      .tdv-filters { position: static; }
    }
    @media (max-width: 768px) {
      .tdv-content { padding: 16px 12px 32px; }
      .tdv-section-header h2 { font-size: 20px; }
      #ov-container, #pmg-ov-container, #por-ov-container, .viewer-error { height: 320px; }
      .tdv-model-info .info-grid { grid-template-columns: 1fr; }
    }

    /* ════════════════════════════════════════════════════════════════════════
       2D DWG SECTION
       ════════════════════════════════════════════════════════════════════════ */

    /* ── Mode Toggle (3D / 2D) ── */
    .tdv-mode-toggle {
      display: flex; gap: 8px; justify-content: flex-start; align-items: center;
      margin-bottom: 0; padding: 0 0 18px;
    }
    .tdv-mode-btn {
      padding: 8px 28px; border-radius: 24px;
      font-family: 'Klavika', Arial, sans-serif;
      font-size: 14px; font-weight: 700;
      text-transform: uppercase; letter-spacing: 0.08em;
      cursor: pointer; border: 2px solid var(--color-primary-dark);
      transition: all 0.18s; outline: none; white-space: nowrap;
    }
    .tdv-mode-btn.active {
      background: var(--color-primary-dark); color: #fff;
      box-shadow: 0 3px 12px rgba(0,73,144,0.25);
    }
    .tdv-mode-btn:not(.active) {
      background: transparent; color: var(--color-primary-dark);
    }
    .tdv-mode-btn:not(.active):hover {
      background: var(--color-bg-blue-light);
    }

    /* ── 2D panel visibility ── */
    .tdv2-panel { display: none; }
    .tdv2-panel.active { display: block; }

    /* ── 2D results grid ── */
    .tdv2-results-grid {
      display: grid; gap: 14px;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    }

    /* ── Download card ── */
    .tdv2-dl-card {
      background: var(--color-bg-white);
      border-radius: var(--border-radius-lg);
      border: 2px solid var(--color-bg-gray-light);
      padding: 16px 18px;
      display: flex; flex-direction: column; gap: 10px;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    .tdv2-dl-card:hover {
      border-color: var(--color-accent-teal);
      box-shadow: 0 4px 18px rgba(0,180,210,0.13);
    }
    .tdv2-dl-card.oop {
      border-color: var(--color-accent-yellow);
      background: var(--color-bg-yellow-light, #fffbf0);
    }

    .tdv2-card-header {
      display: flex; justify-content: space-between;
      align-items: flex-start; gap: 10px;
    }
    .tdv2-card-title {
      font-size: 14px; font-weight: 700;
      color: var(--color-primary-dark); line-height: 1.4;
    }
    .tdv2-card-badges { display: flex; gap: 5px; flex-wrap: wrap; flex-shrink: 0; }

    .tdv2-card-filename {
      font-size: 14px; color: var(--color-neutral-gray);
      font-family: 'Courier New', monospace;
      background: var(--color-bg-light); padding: 5px 8px;
      border-radius: var(--border-radius-sm); word-break: break-all;
    }

    /* ── File-type badges ── */
    .badge-ext {
      padding: 3px 8px; border-radius: 10px;
      font-size: 14px; font-weight: 700;
      letter-spacing: 0.05em; color: #fff;
    }
    .badge-ext-zip { background: linear-gradient(135deg, var(--color-accent-teal), var(--color-teal-dark)); }
    .badge-ext-dwg { background: linear-gradient(135deg, var(--color-blue-deep), var(--color-primary-dark)); }
    .badge-ext-7z  { background: linear-gradient(135deg, #8e44ad, #6c3483); }
    .badge-ext-pdf { background: linear-gradient(135deg, #e74c3c, #c0392b); }

    .badge-oop {
      padding: 3px 8px; border-radius: 10px;
      font-size: 14px; font-weight: 700; letter-spacing: 0.04em;
      background: var(--color-accent-yellow); color: var(--color-dark-text);
    }

    /* Download button variant for 2D (slightly smaller) */
    .btn-dwg-dl { font-size: 14px; padding: 9px 20px; }

    /* ── Static panels wrapper (AVR / HCP / LT3 / Portables) ── */
    .tdv2-static-panel { padding: 4px 0; }

    @media (max-width: 768px) {
      .tdv-mode-btn { padding: 9px 22px; font-size: 14px; }
      .tdv2-results-grid { grid-template-columns: 1fr; }
    }