:root { color-scheme: dark; }
body{margin:0;font-family:ui-sans-serif,system-ui,"Noto Sans TC",Arial;background:#0b0c10;color:#e6edf3}
header{padding:14px 18px;border-bottom:1px solid #1f2428;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.wrap{display:grid;grid-template-columns:320px 1fr;gap:16px;padding:16px}
.panel{background:#111418;border:1px solid #1f2428;border-radius:10px;padding:14px}
label{display:block;margin:10px 0 6px;font-size:14px;opacity:.9}
select,button{width:100%;padding:8px 10px;border-radius:8px;border:1px solid #2b3137;background:#0e1116;color:#e6edf3}
.row{display:grid;grid-template-columns:1fr;gap:10px}
canvas {
    width: 1024px;   /* 瀏覽器顯示寬度 */
    height: auto;   /* 高度自動按比例 */
    background: #0e1116;
    border: 1px solid #1f2428;
    border-radius: 10px;
  }
small{opacity:.75}
.hint{font-size:12px;opacity:.8;margin-top:8px}
.warn{color:#ffcc66;font-size:12px;margin-top:6px}

.dialog-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;align-items:center;justify-content:center;z-index:50}
.dialog{width:min(720px,92vw);max-height:80vh;overflow:auto;background:#111418;border:1px solid #2b3137;border-radius:12px;padding:14px}
.dialog h4{margin:0 0 8px 0}
.list{display:grid;gap:8px}
.card{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center;background:#0e1116;border:1px solid #2b3137;border-radius:10px;padding:10px}
.muted{opacity:.7;font-size:12px}
.row-sm{display:flex;gap:8px}
.btn{padding:6px 10px;border:1px solid #2b3137;background:#151a20;color:#e6edf3;border-radius:8px;cursor:pointer}
.btn.danger{border-color:#5b2222;background:#331a1a}
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
.opt-wrap{display:grid;grid-template-columns:36px 1fr 36px;gap:8px;align-items:center}
.opt-grid{display:grid;grid-auto-flow:column;grid-auto-columns:120px;gap:10px;overflow-x:auto;padding-bottom:6px}
.opt-grid::-webkit-scrollbar{       /* Chrome/Safari */
  display: none;
  width: 0;
  height: 0;
}
.opt{display:flex;flex-direction:column;gap:6px;align-items:center;justify-content:center;
     border:1px solid #2b3137;background:#0e1116;border-radius:10px;padding:10px;cursor:pointer;user-select:none}
.opt.active{outline:2px solid #6b8cff;border-color:#6b8cff}
.opt img{width:84px;height:84px;object-fit:contain;display:block}
.opt .label{font-size:12px;opacity:.9}
.opt .fallback{width:84px;height:84px;display:flex;align-items:center;justify-content:center;
               font-weight:700;font-size:24px;opacity:.9}
.arrow{display:flex;align-items:center;justify-content:center;border:1px solid #2b3137;background:#151a20;
       color:#e6edf3;border-radius:10px;height:120px;cursor:pointer}
.arrow:disabled{opacity:.4;cursor:not-allowed}

.opt-section {
  display: grid;
  grid-template-columns: 30px 1fr 30px; /* 左箭頭、選項區、右箭頭 */
  align-items: center;
  gap: 8px;
}

.arrow.small {
  width: 28px;
  height: 28px;
  font-size: 16px;
  padding: 0;
}

.slider {
  width: 100%;
  margin: 6px 0 14px 0;
}