:root {
    --green: #1CB394;
    --green-border: #2ED4B0;
    --dark-red: #40010D;
    --navy: #010D26;
    --blue-shadow: rgba(28,179,148,0.22);
    --tab-shadow: rgba(64,1,13,0.10);
    --white: #FAFAF6;
    --bg: #EEF8F5;
    --panel: #FAFAF6;
    --divider: #40010D;
    --muted: #888888;
    --accent: #1CB394;
    --seam-line: #1CB394;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: 'Open Sans', sans-serif;
    background: var(--bg);
    color: var(--navy);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  /* ── NAV ── */
  #navbar {
    background: var(--white);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px 0 16px;
    border-bottom: 3px solid var(--dark-red);
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .star-logo {
    width: 44px; height: 40px; cursor: pointer; flex-shrink: 0;
    transition: transform 0.3s;
  }
  .star-logo:hover { transform: rotate(29deg) scale(1.1); }

  .app-title {
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--green);
    border: 2px solid var(--green-border);
    border-radius: 8px;
    padding: 4px 14px;
    font-family: 'Fugaz One', cursive;
    font-size: 22px; font-weight: 400; color: #fff;
    letter-spacing: 0.04em;
    box-shadow: 7px 9px 8px rgba(28,179,148,0.28);
    flex-shrink: 0;
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
    margin-bottom: 4px;
  }

  .tabs { display: flex; gap: 6px; align-items: flex-end; flex-wrap: wrap; padding-bottom: 0; }
  .tab-btn {
    background: var(--white);
    border: 2px solid var(--dark-red);
    border-radius: 6px;
    font-family: 'Open Sans', sans-serif;
    font-size: 13px; font-weight: 700;
    color: var(--navy);
    padding: 4px 12px 5px 12px;
    cursor: pointer;
    box-shadow: 5px 7px 10px var(--tab-shadow);
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
    position: relative; bottom: 0;
    user-select: none;
  }
  .tab-btn:hover { background: #fde8c8; transform: translateY(-1px); }
  .tab-btn.active {
    background: var(--navy);
    color: #fff;
    box-shadow: 3px 4px 6px var(--tab-shadow);
    transform: translateY(1px);
  }
  .tab-btn:disabled { opacity: 0.4; cursor: not-allowed; }

  .nav-utils { margin-left: auto; display: flex; gap: 6px; align-items: center; padding-bottom: 4px; }
  .nav-help-btn {
    background: linear-gradient(135deg, #fff6da 0%, #fde8c8 100%);
    border: 1.5px solid var(--dark-red);
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    color: var(--dark-red);
    padding: 4px 12px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(64,1,13,0.08);
    transition: transform 0.12s, box-shadow 0.15s, background 0.15s, color 0.15s;
    white-space: nowrap;
  }
  .nav-help-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(64,1,13,0.12);
  }
  .nav-help-btn.active {
    background: var(--dark-red);
    color: #fff;
  }
  .util-btn {
    background: #fff; border: 1.5px solid var(--navy); border-radius: 5px;
    font-size: 11px; font-weight: 700; color: var(--navy);
    padding: 3px 9px; cursor: pointer;
    transition: background 0.15s;
  }
  .util-btn:hover { background: var(--navy); color: #fff; }

  /* ── MAIN ── */
  #main { flex: 1; display: flex; flex-direction: column; }
  .tab-panel { display: none; flex-direction: column; padding: 18px 20px; }
  .tab-panel.active { display: flex; }

  /* ── UPLOAD TAB ── */
  .upload-zone {
    border: 3px dashed var(--dark-red);
    border-radius: 12px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 36px 30px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    background: #fafaf6;
    gap: 10px;
    text-align: center;
    min-height: 180px;
  }
  .upload-zone:hover, .upload-zone.dragging {
    background: #fdf0dc; border-color: var(--green-border);
  }
  .upload-zone svg { opacity: 0.5; }
  .upload-zone h2 { font-size: 20px; font-weight: 700; color: var(--dark-red); }
  .upload-zone p { color: var(--muted); font-size: 13px; line-height: 1.5; }
  .upload-zone .hint {
    font-size: 11px; color: var(--muted); border: 1px solid #ddd; border-radius: 4px;
    padding: 4px 10px; background: #f0f0ea; font-family: 'Space Mono', monospace;
  }
  #fileInput { display: none; }

  /* ── WELCOME HERO ── */
  .upload-hero {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; padding: 80px 20px 60px;
    gap: 8px;
  }
  .hero-welcome {
    font-family: 'Open Sans', sans-serif;
    font-size: clamp(16px, 2.2vw, 22px); font-weight: 400;
    color: var(--muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .hero-title {
    font-family: 'Fugaz One', cursive;
    font-size: clamp(42px, 8vw, 80px);
    font-weight: 400;
    color: var(--dark-red);
    letter-spacing: 0.01em;
    line-height: 1.0;
    text-shadow:
      3px 4px 0px rgba(28,179,148,0.30),
      6px 7px 0px rgba(64,1,13,0.10),
      0 2px 24px rgba(28,179,148,0.20);
    position: relative;
  }
  .hero-title::before {
    content: '✦';
    font-size: 0.38em;
    color: var(--green);
    vertical-align: super;
    margin-right: 8px;
    opacity: 0.85;
  }
  .hero-title::after {
    content: '✦';
    font-size: 0.38em;
    color: var(--green);
    vertical-align: super;
    margin-left: 8px;
    opacity: 0.85;
  }
  .hero-tagline {
    font-family: 'Open Sans', sans-serif;
    font-size: clamp(16px, 2.2vw, 22px); font-weight: 400;
    color: var(--navy);
    opacity: 0.60;
    font-style: italic;
    letter-spacing: 0.02em;
    margin-top: 4px;
  }
  .hero-divider {
    width: 60px; height: 2px;
    background: linear-gradient(90deg, transparent, var(--green), transparent);
    margin: 10px auto 0;
    border-radius: 2px;
  }
  #panel-upload.active {
    display: flex; flex-direction: column;
    align-items: center;
    padding: 0 20px 24px;
  }
  #panel-upload .upload-zone { max-width: 620px; width: 100%; }
  #panel-upload .upload-instructions { max-width: 620px; width: 100%; }
  /* ── HOW TO USE TAB ── */
  #panel-howto {
    gap: 22px;
    padding-top: 24px;
    padding-bottom: 30px;
  }
  .howto-hero {
    background:
      radial-gradient(circle at top left, rgba(28,179,148,0.18), transparent 34%),
      radial-gradient(circle at bottom right, rgba(64,1,13,0.10), transparent 32%),
      linear-gradient(135deg, #fffdf8 0%, #f6fbf8 100%);
    border: 2px solid rgba(64,1,13,0.14);
    border-radius: 22px;
    padding: 30px 28px;
    box-shadow: 0 18px 40px rgba(64,1,13,0.08);
  }
  .howto-eyebrow {
    display: inline-block;
    margin-bottom: 10px;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(28,179,148,0.14);
    color: var(--dark-red);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .howto-hero h1 {
    font-family: 'Fugaz One', cursive;
    font-size: clamp(32px, 5vw, 54px);
    line-height: 0.98;
    color: var(--dark-red);
    margin-bottom: 12px;
  }
  .howto-hero p {
    max-width: 720px;
    font-size: 17px;
    line-height: 1.65;
    color: rgba(1,13,38,0.78);
  }
  .howto-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .howto-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .howto-card {
    background: rgba(250,250,246,0.94);
    border: 1.5px solid rgba(64,1,13,0.14);
    border-radius: 18px;
    padding: 20px 18px;
    box-shadow: 0 14px 30px rgba(64,1,13,0.05);
  }
  .howto-card-wide {
    grid-column: span 3;
  }
  .howto-card-kicker {
    margin-bottom: 8px;
    color: var(--green);
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .howto-card h2 {
    font-size: 22px;
    line-height: 1.1;
    color: var(--dark-red);
    margin-bottom: 12px;
  }
  .howto-card p,
  .howto-card li {
    font-size: 14px;
    line-height: 1.65;
    color: rgba(1,13,38,0.78);
  }
  .howto-list,
  .howto-bullets {
    padding-left: 20px;
  }
  .howto-list li + li,
  .howto-bullets li + li {
    margin-top: 6px;
  }
  .howto-note {
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px dashed rgba(64,1,13,0.18);
  }


  .section-title {
    font-size: 13px; font-weight: 700; color: var(--dark-red);
    text-transform: uppercase; letter-spacing: 0.08em;
    margin-bottom: 10px;
  }

  /* ── REVIEW TAB ── */
  #reviewCanvas {
    width: 100%; height: 100%; border-radius: 12px; background: #fff;
    cursor: grab; display: block;
    box-shadow: 0 2px 24px rgba(64,1,13,0.10), 0 1px 4px rgba(0,0,0,0.06);
  }
  #reviewCanvas:active { cursor: grabbing; }
  .canvas-wrap { position: relative; flex: 1; min-height: 300px; }
  .canvas-overlay {
    position: absolute; bottom: 12px; right: 12px;
    display: flex; gap: 6px;
  }
  .overlay-btn {
    background: rgba(255,255,255,0.9); border: 1.5px solid var(--dark-red);
    border-radius: 5px; padding: 4px 10px; font-size: 11px; font-weight: 700;
    cursor: pointer; color: var(--navy);
  }
  .overlay-btn:hover { background: var(--navy); color: #fff; }
  /* Review tab layout */
  .review-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    height: calc(100vh - 120px);
    min-height: 400px;
  }
  .review-3d-col {
    display: flex; flex-direction: column; gap: 6px;
    min-height: 0;
  }
  .review-3d-col .canvas-wrap {
    border-radius: 12px; overflow: hidden;
    box-shadow: 0 2px 24px rgba(64,1,13,0.10);
  }
  .review-flat-col {
    display: flex; flex-direction: column; gap: 6px; min-height: 0;
  }
  .review-col-header {
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 8px; flex-shrink: 0;
    min-height: 32px;
  }
  @media (max-width: 700px) {
    .review-columns { grid-template-columns: 1fr; height: auto; }
  }
  @media (max-width: 980px) {
    .howto-grid { grid-template-columns: 1fr 1fr; }
    .howto-card-wide { grid-column: span 2; }
  }
  @media (max-width: 700px) {
    .howto-grid,
    .howto-columns { grid-template-columns: 1fr; }
    .howto-card-wide { grid-column: span 1; }
    .howto-hero { padding: 24px 20px; }
    .howto-hero p { font-size: 15px; }
  }
  .seam-legend {
    display: flex; gap: 16px; margin-top: 10px; flex-wrap: wrap;
    font-size: 12px; align-items: center;
  }
  .legend-item { display: flex; gap: 6px; align-items: center; }
  .legend-dot {
    width: 16px; height: 4px; border-radius: 2px;
  }
  .info-bar {
    background: #fafaf6; border: 1px solid #e0ddd5; border-radius: 8px;
    padding: 10px 14px; margin-top: 10px;
    font-size: 12px; font-family: 'Space Mono', monospace;
    color: var(--muted); display: flex; gap: 20px; flex-wrap: wrap;
  }
  .info-bar span b { color: var(--navy); }

  /* ── LABEL TAB ── */
  .label-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    align-items: start;
  }
  @media (max-width: 700px) { .label-layout { grid-template-columns: 1fr; } }

  .label-3d-wrap {
    position: sticky; top: 60px;
    background: var(--white); border: 2px solid #e0ddd5; border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 16px rgba(64,1,13,0.09);
    z-index: 10;
  }
  .label-3d-header {
    padding: 8px 12px; background: #fafaf6; border-bottom: 1px solid #e0ddd5;
    font-size: 11px; font-weight: 700; color: var(--dark-red);
    text-transform: uppercase; letter-spacing: 0.07em;
    display: flex; justify-content: space-between; align-items: center;
  }
  #labelCanvas {
    width: 100%; display: block; cursor: grab; background: #fff;
    aspect-ratio: 1 / 1;
  }
  #labelCanvas:active { cursor: grabbing; }
  .label-3d-hint {
    padding: 6px 12px; font-size: 10px; color: var(--muted);
    font-family: 'Space Mono', monospace; text-align: center;
  }

  .pieces-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
  }
  .piece-card {
    background: var(--white); border: 2px solid var(--dark-red); border-radius: 10px;
    padding: 10px 12px; display: flex; flex-direction: column; gap: 8px;
    box-shadow: 4px 5px 8px var(--tab-shadow);
    cursor: pointer;
    transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  }
  .piece-card:hover { transform: translateY(-2px); }
  .piece-card.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(242,174,46,0.35), 4px 5px 8px var(--tab-shadow);
  }
  .piece-canvas { width: 100%; aspect-ratio: 1; background: #f0f0ea; border-radius: 6px; }
  .piece-name-input {
    border: 1.5px solid var(--dark-red); border-radius: 5px; padding: 5px 8px;
    font-family: 'Open Sans', sans-serif; font-size: 13px; font-weight: 600;
    color: var(--navy); width: 100%;
    transition: border-color 0.15s;
  }
  .piece-name-input:focus { outline: none; border-color: var(--accent); }
  .piece-dims { font-weight: 700; color: var(--accent); letter-spacing: 0.02em; }
.piece-meta { font-size: 11px; color: var(--muted); font-family: 'Space Mono', monospace; }

  /* ── MAP TAB ── */
  #panel-map {
    flex: 1;
    min-height: 0;
    overflow: hidden;
  }
  .map-layout {
    display: grid;
    grid-template-columns: 250px 1fr 220px;
    gap: 14px;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    align-items: stretch;
  }
  @media (max-width: 900px) {
    .map-layout { grid-template-columns: 1fr; }
  }

  .map-cards-col {
    min-width: 0;
  }
  .map-tips-row {
    position: relative;
    display: flex;
    align-items: center;
    margin: 0 0 10px;
  }
  .map-tips-row.inline {
    display: inline-flex;
    margin: 0 0 0 4px;
    vertical-align: baseline;
  }
  .map-tips-trigger {
    background: none;
    border: 0;
    padding: 0;
    font: inherit;
    font-size: 12px;
    font-weight: 700;
    color: var(--dark-red);
    text-decoration: underline;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 2px;
    cursor: pointer;
  }
  .map-tips-trigger.inline {
    font-style: italic;
    font-weight: 700;
  }
  .map-tips-popup {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 30;
    width: min(420px, calc(100vw - 40px));
    background: var(--navy);
    color: #fff;
    border-radius: 12px;
    box-shadow: 0 18px 38px rgba(1,13,38,0.22);
    padding: 14px 16px;
    font-size: 12px;
    line-height: 1.55;
  }
  .map-tips-popup div + div { margin-top: 8px; }
  .map-tips-popup strong { color: #fff; }

  .map-3d-wrap {
    background: var(--white);
    border: 2px solid #e0ddd5;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 16px rgba(64,1,13,0.09);
    position: sticky; top: 60px;
    display: flex; flex-direction: column;
    min-height: 500px;
  }
  .map-3d-header {
    padding: 8px 12px;
    background: #fafaf6;
    border-bottom: 1px solid #e0ddd5;
    font-size: 11px; font-weight: 700; color: var(--dark-red);
    text-transform: uppercase; letter-spacing: 0.07em;
    display: flex; justify-content: space-between; align-items: center;
    flex-shrink: 0;
  }
  #mapModelCanvas {
    width: 100%; display: block; cursor: grab; background: #fff;
    flex: 1;
  }
  #mapModelCanvas:active { cursor: grabbing; }

  .map-assembly-wrap {
    background: var(--white);
    border: 2px solid #e0ddd5;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 16px rgba(64,1,13,0.09);
    display: flex; flex-direction: column;
    min-height: 0;
    height: 100%;
  }
  .map-assembly-header {
    padding: 8px 12px;
    background: var(--navy);
    color: #fff;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.07em;
    display: flex; justify-content: space-between; align-items: center;
    gap: 6px; flex-wrap: wrap;
  }
  .map-assembly-header span { color: rgba(255,255,255,0.55); font-weight:400; font-size:10px; }
  .map-assembly-shortcut {
    color: rgba(255,255,255,0.78);
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: none;
  }
  .map-assembly-btns { display: flex; gap: 5px; flex-wrap: wrap; }
  .map-hdr-btn {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.35);
    border-radius: 4px; color: #fff;
    font-size: 10px; font-weight: 700;
    padding: 3px 9px; cursor: pointer;
    font-family: 'Space Mono', monospace;
    transition: background 0.15s;
    white-space: nowrap;
  }
  .map-hdr-btn:hover { background: rgba(255,255,255,0.28); }
  .map-hdr-btn.active { background: var(--green); border-color: var(--green-border); }

  #mapAssemblyCanvas {
    width: 100%; display: block;
    cursor: default; background: #fafaf6;
    flex: 1;
  }
  #mapAssemblyCanvas.dragging-piece { cursor: grabbing; }

  .map-assembly-empty {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 10px; padding: 60px 30px;
    opacity: 0.5; text-align: center;
    font-size: 13px; color: var(--muted);
    min-height: 400px;
  }

  .map-cards-wrap {
    display: flex; flex-direction: column; gap: 8px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-right: 2px;
  }
  .map-piece-card {
    background: var(--white);
    border: 2px solid var(--dark-red);
    border-radius: 8px;
    padding: 8px 10px;
    display: flex; gap: 8px; align-items: center;
    cursor: pointer;
    transition: transform 0.12s, border-color 0.12s, background 0.12s;
    box-shadow: 3px 4px 6px var(--tab-shadow);
    user-select: none;
  }
  .map-piece-card:hover { transform: translateX(-2px); }
  .map-piece-card.selected {
    border-color: var(--accent);
    background: rgba(28,179,148,0.08);
    box-shadow: 0 0 0 2px rgba(28,179,148,0.3), 3px 4px 6px var(--tab-shadow);
  }
  .map-card-swatch {
    width: 28px; height: 28px; border-radius: 5px;
    flex-shrink: 0; border: 1.5px solid rgba(0,0,0,0.1);
  }
  .map-card-info { flex: 1; min-width: 0; }
  .map-card-name {
    font-size: 12px; font-weight: 700; color: var(--navy);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .map-card-meta {
    font-size: 10px; color: var(--muted);
    font-family: 'Space Mono', monospace;
  }
  .map-card-check {
    width: 16px; height: 16px; border-radius: 50%;
    border: 2px solid #ccc; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 9px; color: #fff;
    transition: background 0.12s, border-color 0.12s;
  }
  .map-piece-card.selected .map-card-check {
    background: var(--accent); border-color: var(--accent);
  }
  .map-cards-hint {
    font-size: 10px; color: var(--muted); text-align: center;
    padding: 6px 4px;
    font-family: 'Space Mono', monospace;
    line-height: 1.5;
  }

  /* ── MAP LEGEND ── */
  .map-legend {
    margin-top: 10px; font-size: 12px; color: var(--muted);
    display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
  }
  .map-legend-swatch { width: 20px; height: 20px; border-radius: 3px; border: 1px solid #ccc; }

  /* ── DOWNLOAD TAB ── */
  /* Bin-packed preview canvas */
  /* Download page side-by-side layout */
  .dl-columns {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 20px;
    align-items: start;
  }
  @media (max-width: 800px) { .dl-columns { grid-template-columns: 1fr; } }
  .dl-right-col { display: flex; flex-direction: column; gap: 16px; }
  /* Flat canvas pan */
  #reviewFlatCanvas { cursor: grab; }
  #reviewFlatCanvas:active { cursor: grabbing; }

  .pack-preview-wrap {
    background: #fff;
    border: 2px solid var(--dark-red);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 0;
    box-shadow: 6px 8px 16px var(--blue-shadow);
    position: relative;
  }
  .pack-zoom-hint {
    position: absolute;
    bottom: 6px;
    right: 10px;
    font-size: 10px;
    color: rgba(64,1,13,0.38);
    font-family: 'Space Mono', monospace;
    pointer-events: none;
  }
  .pack-preview-header {
    background: var(--navy);
    color: #fff;
    padding: 8px 14px;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.08em;
    display: flex; justify-content: space-between; align-items: center;
    font-family: 'Space Mono', monospace;
  }
  .pack-preview-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
  }
  #downloadPreviewTitle {
    color: #fff;
    font-weight: 700;
    font-size: 11px;
  }
  .pack-preview-header span { color: rgba(255,255,255,0.55); font-weight: 400; font-size: 10px; }
  #packCanvas {
    width: 100%;
    display: block;
    background: #ffffff; /* always white regardless of theme */
    cursor: default;
  }
  #packCanvas.selectable { cursor: pointer; }
  .dl-piece-selector {
    margin: 8px 0 14px 0;
    background: #fafaf6;
    border: 1.5px solid #e0ddd5;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 12px;
    color: var(--muted);
    display: none;
  }
  .dl-piece-selector.visible { display: block; }
  .dl-piece-selector b { color: var(--navy); }
  .pattern-guide-tile-controls {
    margin-top: 10px;
    padding: 12px 14px;
    border: 1.5px solid #e0ddd5;
    border-radius: 8px;
    background: #fafaf6;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .pattern-guide-scale-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 12px;
    font-weight: 700;
    color: var(--navy);
  }
  .pattern-guide-scale-input {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border: 1.5px solid var(--dark-red);
    border-radius: 6px;
    background: #fff;
    font-family: 'Space Mono', monospace;
  }
  .pattern-guide-scale-input input {
    width: 64px;
    border: none;
    outline: none;
    background: transparent;
    color: var(--navy);
    font: inherit;
    font-weight: 700;
  }
  .pattern-guide-tile-meta {
    font-size: 11px;
    color: var(--muted);
    line-height: 1.5;
  }

  /* Export mode toggle */
  .export-mode-row {
    display: flex; align-items: center; gap: 10px;
    margin-bottom: 14px; flex-wrap: wrap;
  }
  .export-mode-label {
    font-size: 12px; font-weight: 700; color: var(--dark-red);
    text-transform: uppercase; letter-spacing: 0.07em;
  }
  .radio-toggle {
    display: inline-flex; gap: 0; border: 2px solid var(--dark-red); border-radius: 7px;
    overflow: hidden;
    width: fit-content;
    max-width: 100%;
  }
  .radio-toggle label {
    display: flex; align-items: center; gap: 5px;
    padding: 5px 14px;
    font-size: 12px; font-weight: 700;
    cursor: pointer;
    color: var(--dark-red);
    background: #fff;
    transition: background 0.15s, color 0.15s;
    user-select: none;
    flex: 0 0 auto;
    white-space: nowrap;
  }
  .radio-toggle label:not(:last-child) {
    border-right: 1.5px solid var(--dark-red);
  }
  .radio-toggle input[type="radio"] { display: none; }
  .radio-toggle input[type="radio"]:checked + span,
  .radio-toggle label:has(input:checked) {
    background: var(--dark-red);
    color: #fff;
  }
  .radio-toggle label:has(input:checked) { background: var(--dark-red); color: #fff; }

  .download-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 14px; margin-top: 4px;
  }
  .download-grid:not(.active) { display: none; }
  .dl-card {
    background: var(--white); border: 2px solid var(--dark-red); border-radius: 10px;
    padding: 20px 16px; display: flex; flex-direction: column; align-items: center;
    gap: 12px; cursor: pointer; text-align: center;
    box-shadow: 4px 5px 8px var(--tab-shadow);
    transition: background 0.15s, transform 0.15s;
  }
  .dl-card:hover { background: var(--navy); color: #fff; transform: translateY(-2px); }
  .dl-card:hover .dl-ext { color: #6DC48A; }
  .dl-card:hover .dl-desc { color: rgba(255,255,255,0.7); }
  .dl-ext { font-size: 28px; font-weight: 700; font-family: 'Space Mono', monospace; color: var(--dark-red); }
  .dl-label { font-size: 14px; font-weight: 700; }
  .dl-desc { font-size: 11px; color: var(--muted); }

  /* ── EMPTY STATE ── */
  .empty-state {
    flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 12px; opacity: 0.55; pointer-events: none;
    padding: 40px;
    text-align: center;
  }
  .empty-state svg { opacity: 0.4; }
  .empty-state h3 { font-size: 18px; font-weight: 700; }
  .empty-state p { font-size: 13px; color: var(--muted); }

  /* ── TOAST ── */
  #toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    background: var(--navy); color: #fff; padding: 10px 20px; border-radius: 8px;
    font-size: 13px; font-weight: 600; opacity: 0; pointer-events: none;
    transition: opacity 0.3s; z-index: 9999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  }
  #toast.show { opacity: 1; }

  #alert-banner {
    position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.9);
    background: var(--dark-red); color: #fff;
    border: 3px solid var(--accent);
    border-radius: 14px;
    padding: 22px 36px;
    font-family: 'Space Mono', monospace;
    font-size: 15px; font-weight: 700;
    text-align: center; line-height: 1.5;
    opacity: 0; pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 10000;
    box-shadow: 0 8px 40px rgba(1,13,38,0.50), 0 0 0 1px var(--accent);
    max-width: 340px;
  }
  #alert-banner .alert-icon { font-size: 28px; display: block; margin-bottom: 8px; }
  #alert-banner.show { opacity: 1; transform: translate(-50%, -50%) scale(1); pointer-events: auto; }

  #flattery-banner {
    position: fixed; top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(0.88);
    background: linear-gradient(135deg, var(--dark-red) 0%, #200000 100%);
    color: #fff;
    border: 3px solid var(--accent);
    border-radius: 18px;
    padding: 28px 40px 24px;
    font-family: 'Open Sans', sans-serif;
    font-size: 15px; font-weight: 600;
    text-align: center; line-height: 1.6;
    opacity: 0; pointer-events: none;
    transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.34,1.56,0.64,1);
    z-index: 10001;
    box-shadow: 0 12px 48px rgba(1,13,38,0.55), 0 0 0 1px rgba(28,179,148,0.45);
    max-width: 380px; min-width: 260px;
  }
  #flattery-banner.show {
    opacity: 1; transform: translate(-50%, -50%) scale(1); pointer-events: auto;
  }
  #flattery-banner.fading {
    opacity: 0; transform: translate(-50%, -50%) scale(0.95);
    transition: opacity 2.5s ease, transform 2.5s ease;
    pointer-events: none;
  }
  #flattery-banner .fb-title {
    font-family: 'Space Mono', monospace;
    font-size: 11px; font-weight: 700; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--accent);
    display: block; margin-bottom: 10px;
  }
  #flattery-banner .fb-icon { font-size: 32px; display: block; margin-bottom: 8px; }
  #flattery-banner .fb-msg { display: block; }
  #flattery-banner .fb-dismiss {
    display: inline-block; margin-top: 16px;
    background: rgba(28,179,148,0.15); border: 1.5px solid var(--accent);
    border-radius: 20px; padding: 5px 18px;
    font-family: 'Space Mono', monospace; font-size: 11px; font-weight: 700;
    color: var(--accent); cursor: pointer; letter-spacing: 0.06em;
    transition: background 0.15s;
  }
  #flattery-banner .fb-dismiss:hover { background: rgba(28,179,148,0.28); }
  /* ── INFO TOOLTIP ── */
  .info-tooltip-wrap {
    display: inline-flex; align-items: center; gap: 7px;
    font-size: 12px; color: var(--muted);
    font-family: 'Open Sans', sans-serif;
    position: relative;
  }
  .info-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 18px; height: 18px; border-radius: 50%;
    border: 1.5px solid var(--muted);
    font-size: 11px; font-weight: 700; color: var(--muted);
    cursor: default; flex-shrink: 0;
    font-style: italic; font-family: Georgia, serif;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
    user-select: none;
  }
  .info-tooltip-wrap:hover .info-icon {
    border-color: var(--green); color: var(--green);
    background: rgba(28,179,148,0.08);
  }
  .info-tooltip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%; transform: translateX(-50%);
    background: var(--navy);
    color: #fff;
    font-size: 12px; line-height: 1.6;
    padding: 12px 16px;
    border-radius: 8px;
    width: 320px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.22);
    z-index: 200;
    text-align: left;
    /* JS controls visibility via opacity + pointer-events */
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
  }
  .info-tooltip.visible {
    opacity: 1;
    pointer-events: auto;
  }
  .info-tooltip::after {
    content: '';
    position: absolute;
    top: 100%; left: 50%; transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--navy);
  }
  .info-tooltip em { color: rgba(28,179,148,0.9); font-style: normal; font-weight: 600; }
  .info-tooltip code { font-family: 'Space Mono', monospace; font-size: 11px; color: rgba(255,255,255,0.75); }

  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: #c5c5b0; border-radius: 3px; }

  .row { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
  .badge {
    display: inline-block; background: var(--green); color: #fff;
    border-radius: 4px; padding: 2px 8px; font-size: 11px; font-weight: 700;
  }