:root{--ground:#eef2f6;--paper:#fff;--paper-2:#f7f9fb;--ink:#1c2733;--sub:#5b6b7c;--line:#d9e0e8;--line-2:#b9c4d0;--indigo:#2f4f7a;--indigo-dark:#263f62;--gold:#b8922f;--red:#c2485a;--serif:"Hiragino Mincho ProN","Hiragino Mincho Pro","Yu Mincho","YuMincho","Noto Serif JP",serif}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{background:var(--ground);color:var(--ink);font-family:var(--serif);-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent;overscroll-behavior:none}#__next{height:100%}button,input,select,textarea{font-family:inherit;color:inherit;font-size:inherit}button{cursor:pointer;background:none;border:none;padding:0}button:disabled{opacity:.45;cursor:default}input,select,textarea{background:var(--paper-2);border:1px solid var(--line);border-radius:8px;padding:12px 14px;outline:none}input:focus,select:focus,textarea:focus{border-color:var(--indigo)}:focus-visible{outline:2px solid 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var(--line);background:var(--paper);color:var(--ink);min-height:48px}.btn.primary{background:var(--indigo);border-color:var(--indigo);color:#fff;font-weight:700}.btn.primary:active{background:var(--indigo-dark)}.btn.outline{border-color:var(--indigo);color:var(--indigo)}.btn.danger{border-color:var(--red);color:var(--red)}.btn.big{width:100%;padding:22px;font-size:24px;border-radius:14px}.icon-btn{width:48px;height:48px;border-radius:10px;background:var(--ground);color:var(--sub);display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.link-btn{color:var(--indigo);font-size:15px;padding:8px 4px}.login-title{font-size:38px;letter-spacing:.14em;color:var(--indigo);margin:0 0 14px;font-weight:600}.gold-rule{width:64px;height:2px;background:var(--gold);margin:0 auto 40px}.card{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:24px}.login-card{width:100%;max-width:400px;text-align:left}.field{display:block;margin-bottom:18px}.field>span{display:block;color:var(--sub);font-size:14px;margin-bottom:6px}.field input,.field select,.field textarea{width:100%;font-size:19px}.error-text{color:var(--red);font-size:15px;margin:0 0 14px}.net{font-size:13px;color:var(--sub);display:inline-flex;align-items:center;gap:6px}.net i{width:9px;height:9px;border-radius:50%;background:#3c9a5f;display:inline-block}.net.off i{background:var(--gold)}.class-block{margin-bottom:34px}.class-title{display:flex;align-items:center;gap:10px;color:var(--sub);font-size:18px;margin:0 0 12px;font-weight:500}.class-title:before{content:"";width:4px;height:20px;background:var(--gold);display:inline-block}.student-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}.student-card{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px 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transparent}.tool.on{border-color:var(--indigo);color:var(--indigo);background:#fff}.swatch{width:30px;height:30px;border-radius:50%;border:3px solid #fff;box-shadow:0 0 0 1px var(--line-2)}.swatch.on{box-shadow:0 0 0 3px var(--ink)}.swatch.hl{border-radius:6px}.seg{display:inline-flex;background:var(--ground);border-radius:10px;padding:3px}.seg button{padding:9px 14px;border-radius:8px;font-size:14px;color:var(--sub)}.seg button.on{background:#fff;color:var(--indigo);font-weight:700;box-shadow:0 1px 2px rgba(0,0,0,.08)}.lyrics-scroll{flex:1 1;overflow-y:auto;padding:12px;min-height:0}.lyrics-scroll,.sheet-wrap{-webkit-overflow-scrolling:touch}.sheet-wrap{width:100%;overflow-x:auto;overflow-y:hidden}.sheet-outer{position:relative;overflow:hidden;background:var(--paper);border:1px solid var(--line);border-radius:12px}.sheet-inner{position:absolute;top:0;left:0;transform-origin:0 0}.sheet-text{padding:32px 40px 0;font-size:19px;line-height:2.1;letter-spacing:.03em;white-space:pre-wrap;word-break:break-word;color:var(--ink);-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-touch-callout:none}.sheet-canvas{position:absolute;top:0;left:0}.sheet-canvas.pen-only{touch-action:pan-x pan-y}.sheet-canvas.finger{touch-action:none}.sheet-empty{position:absolute;top:32px;left:40px;right:40px;font-size:18px;color:var(--sub)}.zoom{gap:4px;background:var(--ground);border-radius:10px;padding:3px}.zoom,.zoom button{display:inline-flex;align-items:center}.zoom button{width:36px;height:36px;border-radius:8px;color:var(--indigo);font-size:20px;font-weight:700;justify-content:center}.zoom span{min-width:48px;text-align:center;font-size:14px;color:var(--sub)}.panel{background:var(--paper);border-top:1px solid var(--line);display:flex;flex-direction:column;flex-shrink:0;padding-bottom:env(safe-area-inset-bottom,0)}.panel.open{height:44%}.panel-tabs{display:flex;border-bottom:1px solid 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h2{font-size:20px;color:var(--indigo);margin:0 0 12px;font-weight:600}.edit-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}.edit-row input{flex:1 1;font-size:17px;padding:10px 12px;min-width:0}.edit-row .num{width:28px;text-align:right}.edit-row .num,.mini-btn{color:var(--sub);flex-shrink:0}.mini-btn{width:40px;height:40px;border-radius:8px;background:var(--ground);display:inline-flex;align-items:center;justify-content:center}.mini-btn.del{color:var(--red)}.cat-box{background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:14px}.cat-box .cat-head input{font-weight:700;color:var(--indigo)}.cat-items{margin:10px 0 0 18px}.type-tag{font-size:12px;color:var(--gold);border:1px solid var(--gold);border-radius:4px;padding:2px 5px;flex-shrink:0}.dashed-btn{width:100%;padding:14px;border:2px dashed var(--line-2);border-radius:10px;color:var(--sub);font-size:16px}@media 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