:root{--paper: #faf7f2;--paper-2: #f2ede4;--card: #ffffff;--ink: #2e3236;--ink-soft: #6d7278;--ink-faint: #b4b8bc;--line: #cfcbc3;--blue: #4a7fb5;--blue-soft: #dce9f6;--teal: #3f8f88;--teal-soft: #d8ecea;--green: #4f8f63;--green-soft: #dcecdf;--amber: #c8892a;--amber-soft: #fbeed3;--violet: #7367b5;--violet-soft: #e6e2f6;--rose: #c4705f;--rose-soft: #f8e3dd;--slot-current: #fff6dc;--slot-current-line: #e0a92c;--slot-line: #c8c3b9;--answer-tint: #eef4fb;--play: #d2791f;--play-soft: #fdeccd;--radius: 20px;--shadow-1: 0 1px 2px rgba(46, 50, 54, .07), 0 6px 16px rgba(46, 50, 54, .06);--shadow-2: 0 10px 30px rgba(46, 50, 54, .16), 0 2px 6px rgba(46, 50, 54, .08);--font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;--font-note: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif}*{box-sizing:border-box}html,body{height:100%;margin:0;overflow:hidden;background:var(--paper);color:var(--ink);font-family:var(--font);overscroll-behavior:none;touch-action:manipulation;-webkit-text-size-adjust:100%}body{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;user-select:none;-webkit-user-select:none}#app{position:fixed;inset:0;display:grid;grid-template-rows:auto minmax(0,1fr);gap:clamp(4px,.8vh,10px);padding:calc(env(safe-area-inset-top,0px) + clamp(6px,1vh,14px)) calc(env(safe-area-inset-right,0px) + clamp(10px,1.6vw,26px)) calc(env(safe-area-inset-bottom,0px) + clamp(8px,1.2vh,16px)) calc(env(safe-area-inset-left,0px) + clamp(10px,1.6vw,26px))}.topbar{display:flex;align-items:center;justify-content:space-between;gap:clamp(8px,1.4vw,20px);min-height:0}.topbar__side{display:flex;align-items:center;gap:clamp(8px,1vw,14px);flex:0 0 auto}.topbar__center{flex:1 1 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scale(.985)}.btn__icon{font-size:1.05em;line-height:1}.btn--play{background:var(--blue);border-color:var(--blue);color:#fff;min-width:clamp(112px,11vw,168px)}.btn--play.is-playing{background:var(--amber);border-color:var(--amber)}.btn--start{height:clamp(58px,8vh,76px);padding:0 clamp(38px,6vw,76px);font-size:clamp(20px,2.1vw,28px);background:var(--blue);border-color:var(--blue);color:#fff}.btn:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.btn[disabled]{opacity:.45;cursor:default}.stage{display:grid;grid-template-rows:minmax(0,1.85fr) minmax(0,1fr);gap:clamp(4px,.8vh,12px);min-height:0}.score-area{display:flex;align-items:center;justify-content:center;min-height:0;min-width:0}.score-svg{display:block;width:100%;height:100%;pointer-events:none;overflow:visible}.score-svg text{font-family:var(--font-note);font-weight:600}.score-meta__key,.score-meta__meter{fill:var(--ink);font-weight:600}.score-meta__meter-bar{stroke:var(--ink)}.note__digit,.note--rest,.note__dot,.note__augment{fill:var(--ink)}.tie,.duration-line__stroke,.barline,.brace__thick{stroke:var(--ink);fill:none}.brace__thin,.brace__hook{fill:var(--ink);stroke:none}.duration-line__stroke{stroke-linecap:butt}.dash{stroke:var(--ink)}.score-mark--cue{fill:var(--ink-faint);font-weight:600}.slot__box{fill:#fffdf8;stroke:var(--slot-line);stroke-width:2.6;stroke-dasharray:9 7;transition:fill .18s ease,stroke .18s ease}.slot.is-current .slot__box{fill:var(--slot-current);stroke:var(--slot-current-line);stroke-dasharray:none;stroke-width:5;animation:slot-breathe 2.6s ease-in-out infinite}.slot.is-dragover .slot__box{fill:#ffeec2;stroke:var(--amber);stroke-width:7;animation:none;filter:drop-shadow(0 0 10px rgba(200,137,42,.45))}.slot.is-filled .slot__box{fill:var(--answer-tint);stroke:transparent;stroke-dasharray:none;animation:none}.slot.is-playing .slot__box{fill:var(--play-soft);stroke:transparent}.slot.is-playing .note__digit,.note.is-playing .note__digit,.note.is-playing .note__dot{fill:var(--play)}.note.is-playing .note__digit{filter:drop-shadow(0 0 8px rgba(210,121,31,.5))}@keyframes slot-breathe{0%,to{stroke-opacity:.5;stroke-width:4}50%{stroke-opacity:1;stroke-width:6.4}}@media (prefers-reduced-motion: reduce){.slot.is-current .slot__box{animation:none;stroke-width:6}}.panel{display:grid;grid-template-rows:auto minmax(0,1fr);gap:clamp(2px,.6vh,10px);min-height:0}.panel__head{display:flex;align-items:center;justify-content:space-between;gap:clamp(10px,2vw,28px);min-height:0}.progress{display:inline-flex;align-items:center;gap:clamp(8px,1vw,14px);flex:0 0 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0}.candidate{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.1em;width:clamp(88px,9.6vw,136px);height:clamp(92px,15.5vh,152px);padding:clamp(6px,1vh,14px);border:none;border-radius:clamp(18px,1.8vw,26px);background:var(--blue-soft);color:var(--ink);font-family:inherit;box-shadow:var(--shadow-1);cursor:grab;touch-action:none;transition:transform .14s ease,box-shadow .16s ease,filter .16s ease}.candidate:active{transform:translateY(2px) scale(.98)}.candidate:focus-visible{outline:3px solid var(--blue);outline-offset:4px}.candidate.is-source{opacity:.4;filter:saturate(.7)}.choice-group{display:flex;flex-direction:column;align-items:center;gap:clamp(2px,.5vh,7px);padding:clamp(4px,.8vh,10px) clamp(8px,1.2vw,18px);border-radius:clamp(20px,2vw,30px);border:2px dashed transparent;transition:background-color .2s ease,border-color .2s ease,opacity .2s ease}.choice-group__cards{display:flex;align-items:center;gap:clamp(10px,1.7vw,30px)}.choice-group__caption{margin:0;font-size:clamp(11px,1.05vw,15px);letter-spacing:.08em;color:var(--ink-soft);white-space:nowrap}.choice-group.is-active{border-color:var(--blue);background:#4a7fb512}.choice-group.is-active .choice-group__caption{color:var(--blue);font-weight:600}.choice-group.is-disabled{opacity:.32;filter:grayscale(.75)}.choice-group.is-disabled .candidate{pointer-events:none;cursor:default;box-shadow:none}.choice-divider{width:2px;align-self:stretch;margin:0 clamp(6px,1vw,16px);border-radius:2px;background:repeating-linear-gradient(to bottom,var(--line) 0,var(--line) 8px,transparent 8px,transparent 16px)}.candidate__glyph{display:block;flex:1 1 auto;width:100%;min-height:0}.note-thumb{width:100%;height:100%;display:block}.candidate__glyph .note__digit,.candidate__glyph .note__dot{fill:var(--ink)}.candidate__name{flex:0 0 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calc(env(safe-area-inset-bottom,0px) + 16px) calc(env(safe-area-inset-left,0px) + 16px);background:#faf7f2d1;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px)}.overlay[hidden]{display:none}.overlay__card{width:min(92vw,660px);max-height:92vh;overflow:auto;padding:clamp(22px,4vh,46px) clamp(24px,4.5vw,64px);border-radius:30px;background:var(--card);box-shadow:var(--shadow-2);text-align:center}.overlay__moon{font-size:clamp(40px,6vw,64px);line-height:1;margin-bottom:.15em}.overlay__title{margin:0 0 clamp(10px,1.6vh,18px);font-size:clamp(24px,3vw,40px);letter-spacing:.08em}.overlay__desc{margin:0 0 clamp(16px,2.4vh,28px);font-size:clamp(15px,1.6vw,21px);line-height:1.75;color:var(--ink-soft)}.overlay__desc b{color:var(--blue)}.overlay__actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:clamp(10px,1.6vw,20px)}.overlay__hint{margin:clamp(14px,2vh,22px) 0 0;font-size:clamp(12px,1.1vw,15px);color:var(--ink-faint);letter-spacing:.05em}.toast{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + clamp(14px,2.4vh,30px));transform:translate(-50%,12px);z-index:90;padding:.7em 1.3em;border-radius:999px;background:#2e3236e0;color:#fff;font-size:clamp(13px,1.3vw,17px);letter-spacing:.05em;opacity:0;transition:opacity .2s ease,transform .2s ease;pointer-events:none;white-space:nowrap}.toast[hidden]{display:none}.toast.is-visible{opacity:1;transform:translate(-50%)}.rotate-hint{position:fixed;left:50%;top:calc(env(safe-area-inset-top,0px) + 8px);transform:translate(-50%);z-index:70;padding:.45em 1em;border-radius:999px;background:#fffffff0;box-shadow:var(--shadow-1);font-size:clamp(12px,1.2vw,15px);color:var(--ink-soft);display:none;pointer-events:none}@media (orientation: portrait) and (max-width: 900px){.rotate-hint{display:block}}.selftest{position:fixed;left:0;top:0;z-index:200;max-width:46vw;max-height:60vh;overflow:auto;margin:0;padding:10px 14px;background:#fffffff5;border:1px solid var(--line);border-radius:0 0 12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;line-height:1.5;white-space:pre-wrap}.selftest[hidden]{display:none}@media (max-height: 640px){.stage{grid-template-rows:minmax(0,1.7fr) minmax(0,1fr)}.candidate{width:clamp(84px,10vw,120px);height:clamp(84px,16vh,132px)}.candidate__name,.song-meta{display:none}}@media (max-width: 760px){.btn__label{display:none}.btn{padding:0 clamp(12px,3vw,18px)}.candidate{width:clamp(88px,22vw,120px);height:clamp(92px,16vh,130px)}.prompt{display:none}}