:root{
    --straight:#4f7cac;
    --detour:#665d8a;
    --crest:#4e9b74;
    --source:#c89b3c;
    --accent:#c89b3c;
  }
  header{margin-bottom:38px;}
  .eyebrow{
    font-family:'Space Mono',monospace;font-size:12px;letter-spacing:0.32em;
    text-transform:uppercase;color:var(--accent);margin-bottom:14px;
  }
  h1{
    font-family:'Merriweather',serif;font-weight:500;font-size:clamp(32px,5vw,52px);
    line-height:1.04;letter-spacing:-0.02em;max-width:20ch;
  }
  h1 em{font-style:italic;color:var(--detour);}
  .sub{
    color:var(--muted);font-size:18px;line-height:1.6;max-width:64ch;margin-top:18px;
  }

  .layout{display:grid;grid-template-columns:1.35fr 1fr;gap:28px;margin-top:42px;align-items:start;}
  @media(max-width:860px){.layout{grid-template-columns:1fr;}}

  .stage{
    background:var(--panel);border:1px solid var(--line);border-radius:20px;
    padding:14px;position:relative;overflow:hidden;
  }
  .stage::before{
    content:"";position:absolute;inset:0;
    background:none;
    pointer-events:none;
  }
  canvas{width:100%;height:480px;display:block;border-radius:12px;cursor:grab;}
  canvas:active{cursor:grabbing;}
  .hint{
    position:absolute;bottom:20px;left:0;right:0;text-align:center;
    font-family:'Space Mono',monospace;font-size:11px;letter-spacing:0.12em;
    color:var(--faint);text-transform:uppercase;pointer-events:none;
  }
  .tag{
    position:absolute;top:24px;left:24px;font-family:'Space Mono',monospace;
    font-size:12px;letter-spacing:0.14em;color:var(--detour);text-transform:uppercase;
    pointer-events:none;
  }

  .side{display:flex;flex-direction:column;gap:18px;}

  .controls{
    background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px;
  }
  .ctrl-label{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:0.1em;color:var(--muted);text-transform:uppercase;margin-bottom:14px;}
  .pick{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:18px;}
  .pick button{
    font-family:'Merriweather',serif;font-size:20px;font-weight:500;
    color:var(--ink);background:transparent;border:1px solid var(--line);
    border-radius:10px;padding:12px 0;cursor:pointer;transition:all .18s ease;
  }
  .pick button:hover{border-color:var(--detour);background:rgba(102,93,138,0.10);}
  .pick button.active{border-color:var(--crest);color:var(--crest);background:rgba(78,155,116,0.10);}
  .btns{display:flex;gap:10px;}
  .btns button{
    flex:1;font-family:'DM Sans',sans-serif;font-size:12px;font-weight:700;letter-spacing:0.08em;
    text-transform:uppercase;color:var(--ink);background:transparent;
    border:1px solid var(--line);border-radius:10px;padding:11px 8px;cursor:pointer;
    transition:all .18s ease;
  }
  .btns button:hover{border-color:var(--detour);background:rgba(102,93,138,0.10);}
  .btns button.active{border-color:var(--crest);color:var(--crest);background:rgba(78,155,116,0.08);}

  .legend{display:flex;flex-direction:column;gap:12px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px 24px;}
  .leg-item{display:flex;align-items:center;gap:12px;}
  .dot{width:13px;height:13px;border-radius:50%;flex-shrink:0;}
  .leg-text{font-size:15px;color:var(--ink);}
  .leg-text span{color:var(--muted);font-size:13px;display:block;margin-top:1px;}

  .factcard{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px 24px;}
  .factcard .fc-title{font-family:'Merriweather',serif;font-size:20px;color:var(--detour);margin-bottom:6px;}
  .factcard .fc-desc{color:var(--muted);font-size:14.5px;line-height:1.55;margin-bottom:16px;}
  .fc-row{display:flex;justify-content:space-between;align-items:baseline;padding:8px 0;border-top:1px solid var(--line);}
  .fc-row .k{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:0.06em;color:var(--muted);text-transform:uppercase;}
  .fc-row .v{font-family:'Space Mono',monospace;font-size:14px;color:var(--ink);}
  .fc-row.hi .v{color:var(--crest);font-size:16px;}

  .concept{margin-top:48px;}
  .concept h2{
    font-family:'Merriweather',serif;font-weight:500;font-size:26px;margin-bottom:24px;
    letter-spacing:-0.01em;
  }
  .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
  @media(max-width:780px){.steps{grid-template-columns:1fr;}}
  .step{
    background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px;
  }
  .step-num{
    font-family:'Space Mono',monospace;font-size:13px;color:var(--accent);
    letter-spacing:0.1em;margin-bottom:14px;
  }
  .step h3{font-family:'Merriweather',serif;font-weight:500;font-size:19px;margin-bottom:10px;color:var(--detour);}
  .step p{color:var(--muted);font-size:15px;line-height:1.62;}

  .result{
    margin-top:42px;background:var(--panel);border:1px solid var(--line);border-radius:18px;
    padding:32px;
  }
  .result .label{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:0.18em;text-transform:uppercase;color:var(--straight);margin-bottom:18px;}
  .matchgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
  @media(max-width:780px){.matchgrid{grid-template-columns:repeat(2,1fr);}}
  .match{text-align:center;border:1px solid var(--line);border-radius:14px;padding:18px 10px;}
  .match .m-cfg{font-family:'Merriweather',serif;font-size:26px;color:var(--detour);}
  .match .m-arrow{color:var(--faint);font-size:13px;margin:6px 0;font-family:'Space Mono',monospace;}
  .match .m-val{font-family:'Space Mono',monospace;font-size:18px;color:var(--crest);}
  .match .m-opt{color:var(--muted);font-size:12px;margin-top:4px;}