:root{
      --bg: #fafafa;
      --fg: #0a0a0a;
      --muted: #71717a;
      --muted-light: #a1a1aa;
      --border: #e4e4e7;
      --border-light: #f4f4f5;
      --accent-primary: #334155;
      --accent-secondary: #64748b;
      --type-cog: #3b82f6;
      --type-comp: #10b981;
      --type-emo: #fb923c;
      --type-p: #38bdf8;
      --card-w: 63mm;
      --card-h: 88mm;
      --radius: 8px;
      --pad: 16px;
      --fs-xxs: 10px;
      --fs-xs: 11px;
      --fs-sm: 13px;
      --fs-md: 15px;
      --fs-lg: 17px;
      --fs-xl: 19px;
    }

    html, body{
      background: var(--bg);
      color: var(--fg);
      margin: 0;
      font: 400 15px/1.6 "Inter", "Source Sans 3", "IBM Plex Sans", system-ui, sans-serif;
      -webkit-font-smoothing: antialiased;
      min-height: 100vh;
    }

    /* Toolbar */
    .toolbar{
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      padding: 14px 20px;
      display: flex;
      gap: 16px;
      align-items: center;
    }

    .toolbar h1{
      font-size: 17px;
      margin: 0;
      font-weight: 600;
    }

    .toolbar .sub{
      color: var(--muted);
      font-weight: 400;
      margin-left: 6px;
    }

    #backBtn{
      margin-left: auto;
      padding: 6px 16px;
      font: inherit;
      font-size: 13px;
      font-weight: 500;
      border: 1px solid var(--border);
      border-radius: 6px;
      background: #fff;
      cursor: pointer;
      display: none;
    }

    #backBtn:hover{
      background: var(--border-light);
    }

    /* ---- PATTERN GRID ---- */
    .p-grid{
      padding: 40px 20px;
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(63mm, 1fr));
      gap: 16px;
      max-width: 1100px;
      margin: 0 auto;
      transition: opacity 0.3s ease;
    }

    .p-grid.hidden{
      display: none;
    }

    /* ---- CROSS VIEW ---- */
    .cross-view{
      display: none;
      flex-direction: column;
      align-items: center;
      padding: 30px 20px 60px;
      min-height: calc(100vh - 60px);
    }

    .cross-view.active{
      display: flex;
    }

    /* Cross layout */
    .cross-layout{
      display: grid;
      grid-template-areas:
        ".    cog  ."
        "emo  pat  comp"
        ".    .    .";
      grid-template-columns: var(--card-w) var(--card-w) var(--card-w);
      grid-template-rows: var(--card-h) var(--card-h) auto;
      gap: 12px;
      align-items: center;
      justify-items: center;
    }

    .cross-center{ grid-area: pat; }
    .cross-top{ grid-area: cog; }
    .cross-left{ grid-area: emo; }
    .cross-right{ grid-area: comp; }

    /* Wing slots (clickable areas when folded) */
    .wing-slot{
      width: var(--card-w);
      height: var(--card-h);
      perspective: 1000px;
      cursor: pointer;
    }

    /* Wing folded state: a thin colored strip */
    .wing-slot .wing-tab{
      width: 100%;
      height: 100%;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: var(--fs-xs);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      transform-origin: center;
      border: 2px dashed var(--border);
      color: var(--muted);
      background: rgba(255,255,255,0.5);
    }

    .wing-slot.top .wing-tab{
      border-color: rgba(59,130,246,0.3);
      color: var(--type-cog);
      background: rgba(59,130,246,0.04);
    }

    .wing-slot.left .wing-tab{
      border-color: rgba(251,146,60,0.3);
      color: var(--type-emo);
      background: rgba(251,146,60,0.04);
    }

    .wing-slot.right .wing-tab{
      border-color: rgba(16,185,129,0.3);
      color: var(--type-comp);
      background: rgba(16,185,129,0.04);
    }

    .wing-slot .wing-tab:hover{
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }

    /* Wing open: shows the real card */
    .wing-slot.open .wing-tab{
      display: none;
    }

    .wing-slot .card-container{
      display: none;
    }

    .wing-slot.open .card-container{
      display: block;
      animation: unfold 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    @keyframes unfold {
      from { opacity: 0; transform: scale(0.8) rotateY(-30deg); }
      to   { opacity: 1; transform: scale(1) rotateY(0); }
    }

    .wing-slot.top.open .card-container{
      animation-name: unfold-top;
    }

    @keyframes unfold-top {
      from { opacity: 0; transform: scale(0.8) rotateX(30deg); }
      to   { opacity: 1; transform: scale(1) rotateX(0); }
    }

    /* ---- SHARED CARD STYLES ---- */
    .card{
      width: var(--card-w);
      height: var(--card-h);
      perspective: 1000px;
      cursor: pointer;
      flex-shrink: 0;
    }

    .card-inner{
      position: relative;
      width: 100%;
      height: 100%;
      transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      transform-style: preserve-3d;
    }

    .card.flipped .card-inner{
      transform: rotateY(180deg);
    }

    .face{
      position: absolute;
      inset: 0;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: var(--pad);
      backface-visibility: hidden;
      display: flex;
      flex-direction: column;
      background: #fff;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
    }

    .face.front{ border-left-width: 3px; }
    .face.back{
      transform: rotateY(180deg);
      padding: 0;
      display: grid;
      grid-template-rows: auto 1fr auto;
    }

    .Cog .face{ background: rgba(59,130,246,0.06); }
    .Cog .face.front{ border-left-color: var(--type-cog); }
    .Comp .face{ background: rgba(16,185,129,0.04); }
    .Comp .face.front{ border-left-color: var(--type-comp); }
    .Emo .face{ background: rgba(251,146,60,0.04); }
    .Emo .face.front{ border-left-color: var(--type-emo); }
    .P .face{ background: rgba(56,189,248,0.04); }
    .P .face.front{ border-left-color: var(--type-p); }

    .card-head{
      display: flex;
      gap: 8px;
      align-items: flex-start;
      justify-content: space-between;
      margin-bottom: 12px;
    }

    .card-id{
      font-size: var(--fs-xxs);
      color: var(--muted-light);
      letter-spacing: 0.04em;
      text-transform: uppercase;
      font-weight: 500;
    }

    .type-pill{
      font-size: var(--fs-xxs);
      padding: 3px 8px;
      border-radius: 4px;
      text-transform: uppercase;
      letter-spacing: 0.03em;
      font-weight: 600;
    }

    .Cog .type-pill{ background: rgba(59,130,246,0.1); color: var(--type-cog); }
    .Comp .type-pill{ background: rgba(16,185,129,0.1); color: var(--type-comp); }
    .Emo .type-pill{ background: rgba(251,146,60,0.1); color: var(--type-emo); }
    .P .type-pill{ background: rgba(56,189,248,0.1); color: var(--type-p); }

    .title{
      font-size: var(--fs-lg);
      line-height: 1.3;
      font-weight: 600;
      letter-spacing: -0.01em;
      margin: 0 0 14px;
      color: var(--fg);
    }

    .principle-line{
      font-size: var(--fs-sm);
      font-weight: 500;
      margin: 12px 0 8px;
      color: var(--fg);
      line-height: 1.5;
    }

    .howto-line{
      font-size: var(--fs-sm);
      margin-top: 10px;
      color: var(--muted);
      line-height: 1.5;
    }

    .howto-line strong{
      color: var(--accent-primary);
      font-weight: 600;
    }

    .section{ margin-top: 10px; }
    .section-title{
      font-size: var(--fs-xs);
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 4px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .section-title::before{
      content: '';
      display: inline-block;
      width: 3px; height: 3px;
      border-radius: 50%;
      background: currentColor;
      opacity: 0.4;
    }
    .section-content{
      font-size: var(--fs-sm);
      line-height: 1.4;
      color: var(--fg);
    }
    .section-content ul{ margin: 0; padding-left: 16px; }
    .section-content li{ margin-bottom: 2px; }

    .aliases-line{
      font-size: var(--fs-xs);
      color: var(--muted);
      margin-top: 6px;
      font-style: italic;
      line-height: 1.4;
    }

    .footer{
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: auto;
      padding-top: 12px;
      border-top: 1px solid var(--border-light);
    }

    .hint{
      font-size: var(--fs-xxs);
      color: var(--muted-light);
      text-transform: uppercase;
      letter-spacing: 0.04em;
      font-weight: 500;
    }

    .back-header{
      padding: 10px var(--pad) 8px;
      border-bottom: 1px solid var(--border-light);
    }
    .back-header .card-head{ margin-bottom: 0; }

    .aka-line{
      font-size: var(--fs-xs);
      color: var(--muted);
      margin-top: 8px;
      font-style: italic;
      line-height: 1.4;
    }

    .back-content{ padding: 10px var(--pad); }
    .back-footer{
      padding: 8px var(--pad);
      border-top: 1px solid var(--border-light);
      text-align: center;
    }
    .back-footer .hint{ display: block; }

    .block{ margin-bottom: 10px; }
    .block:last-child{ margin-bottom: 0; }

    .label{
      font-size: var(--fs-xxs);
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 3px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .label::before{
      content: '';
      display: inline-block;
      width: 3px; height: 3px;
      border-radius: 50%;
      background: currentColor;
      opacity: 0.4;
    }

    .small{
      font-size: var(--fs-xs);
      line-height: 1.35;
      color: var(--fg);
    }

    .card:hover .face{
      box-shadow: 0 4px 6px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
    }

    /* P card in grid - clickable feel */
    .p-grid .card.P{
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .p-grid .card.P:hover{
      transform: translateY(-2px);
    }

    /* Mobile */
    @media (max-width: 768px) {
      .cross-layout{
        grid-template-areas:
          "cog"
          "emo"
          "pat"
          "comp";
        grid-template-columns: var(--card-w);
        grid-template-rows: auto;
        gap: 12px;
      }

      .p-grid{
        grid-template-columns: 1fr;
        padding: 20px 16px;
      }

      .card{
        max-width: 90vw;
        margin: 0 auto;
      }
    }