fix: 优化跳跃和下落手感

css/style.css

@@ -137,13 +137,6 @@ canvas#game{
 .t-custom{color:#ffc63a;border-color:#ffc63a}
 .legend{display:flex;gap:8px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:7px;color:var(--dim);font-size:.85em;align-items:center}
 
-.help-body{display:flex;gap:18px;flex-wrap:wrap;overflow-y:auto}
-.help-col{flex:1;min-width:240px}
-.help-col ul{list-style:none;line-height:1.75}
-.help-col li{color:var(--dim);font-size:.92em}
-.help-col li b{color:var(--fg)}
-.help-tip{border-top:1px solid var(--line);padding-top:8px;color:var(--gold);font-size:.85em}
-
 .clear-title{text-align:center;font-size:2.4em;color:var(--gold);letter-spacing:6px;text-shadow:3px 3px 0 #000}
 .result-body{display:flex;flex-direction:column;gap:5px}
 .rline{display:flex;justify-content:space-between;border-bottom:1px dotted var(--line);padding:4px 2px}
@@ -159,7 +152,7 @@ canvas#game{
 }
 .pal:hover{border-color:#888}
 .pal.on{border-color:var(--gold);color:#fff;background:#2b2b3c}
-.pal .sw{width:14px;height:14px;border:1px solid #000;flex:none}
+.pal-cv{width:26px;height:26px;flex:none;border:1px solid #000;background:#101018;image-rendering:pixelated}
 .pal .ch{font-weight:bold;color:var(--fg);width:12px;text-align:center}
 .editor-main{flex:1;display:flex;flex-direction:column;gap:6px;min-width:0;overflow:auto}
 .editor-bar{display:flex;gap:5px;align-items:center;flex-wrap:wrap}
@@ -228,6 +221,35 @@ canvas#ed-canvas{
 .set-in:focus{outline:none;border-color:var(--gold)}
 .set-hint{color:var(--dim);font-size:.78em}
 .set-btns{margin-top:2px}
+/* 键盘按键映射面板（电脑端） */
+.set-keys{display:flex;flex-direction:column;gap:8px}
+.krow{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
+.kact{color:var(--fg);min-width:104px;font-size:.92em}
+.kkeys{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
+.kchip{
+  position:relative;background:#1a1a26;border:1px solid var(--line);color:var(--fg);
+  font-family:inherit;font-size:.88em;padding:5px 22px 5px 10px;border-radius:7px;cursor:pointer;
+  transition:border-color .1s,background .1s;
+}
+.kchip:hover{border-color:var(--gold)}
+.kchip.listen{border-color:var(--gold);background:rgba(255,198,58,.16);box-shadow:0 0 0 2px rgba(255,198,58,.25)}
+.kchip .krm{
+  position:absolute;top:-7px;right:-7px;width:16px;height:16px;border-radius:50%;
+  background:#c01a3a;color:#fff;font-size:.62em;line-height:16px;text-align:center;
+  border:1px solid #000;cursor:pointer;
+}
+.kadd{
+  background:transparent;border:1px dashed var(--line);color:var(--dim);
+  font-family:inherit;font-size:.82em;padding:5px 9px;border-radius:7px;cursor:pointer;
+}
+.kadd:hover{color:var(--gold);border-color:var(--gold)}
+.klisten{color:var(--gold);font-size:.8em;animation:blink 1s infinite}
+.klisten.bad{color:#ff6b6b;animation:none;font-weight:bold}
+.kwarb{
+  width:100%;box-sizing:border-box;margin:0 0 10px;padding:8px 12px;border-radius:8px;
+  background:rgba(192,26,58,.16);border:1px solid #c01a3a;color:#ff8a8a;font-size:.86em;
+}
+@keyframes blink{50%{opacity:.4}}
 /* 手机手柄预览区（与舞台同比例），按钮绝对定位可拖拽 */
 .touch-preview{
   position:relative;width:100%;aspect-ratio:800/608;