@charset "UTF-8";
:root{--paper:#f7f5ef;--surface:#fffdf8;--ink:#253a33;--muted:#777d71;--line:#deded1;--red:#9f3d31;--red-soft:#f1e4db;--green:#517362;--gold:#a17a3d;--sans:"Microsoft YaHei","PingFang SC",sans-serif;--serif:"Noto Serif CJK SC","Source Han Serif SC","Songti SC","SimSun",serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 var(--sans)}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{color:inherit}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #b68340;outline-offset:4px}a{color:inherit}h1,h2,h3,p{margin:0}button{border:0;background:none}button:not(:disabled){transition:background .2s,color .2s,box-shadow .2s}button:hover:not(:disabled){filter:brightness(.97)}[hidden]{display:none!important}.site-header{height:104px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 5%;gap:24px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none}.seal{width:43px;height:48px;display:grid;place-items:center;border:1px solid var(--red);outline:1px solid var(--red);outline-offset:-5px;color:var(--red);font:28px var(--serif);border-radius:3px}.brand-name{font:600 27px var(--serif);letter-spacing:4px}.brand-name small{display:block;font:12px/1.5 var(--sans);letter-spacing:2px;margin-top:7px;color:var(--muted)}nav{display:flex;align-items:center;gap:28px;height:100%}.nav-button{height:100%;position:relative;padding:0 10px;font-size:16px;color:#70776d}.nav-button.active{color:var(--red);font-weight:600}.nav-button.active:after{content:"";position:absolute;bottom:0;left:25%;right:25%;height:3px;background:var(--red)}.header-note{font:14px var(--serif);letter-spacing:3px;color:var(--muted)}main{max-width:1500px;margin:auto;padding:36px 5% 0}.page-intro{display:flex;justify-content:space-between;align-items:end;margin-bottom:27px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);margin-bottom:8px}h1{font:500 clamp(25px,2.3vw,34px)/1.5 var(--serif);letter-spacing:2px}.intro-side{font-size:13px;color:var(--muted);text-align:right;line-height:1.9}.play-layout{display:grid;grid-template-columns:275px minmax(0,1fr);gap:28px}.section-label{display:flex;justify-content:space-between;font-size:14px;padding:6px 0 16px;border-bottom:1px solid var(--line)}.section-label span:last-child{color:var(--muted);font-size:12px}.song-card{width:100%;display:flex;text-align:left;align-items:center;gap:13px;border-bottom:1px solid var(--line);padding:23px 13px;position:relative;min-height:104px}.song-card.selected{background:var(--red-soft);border-radius:3px;border-bottom-color:transparent}.song-card.selected:before{content:"";position:absolute;left:0;top:22px;bottom:22px;width:3px;background:var(--red)}.song-number{font:italic 19px Georgia,serif;color:#aab0a5}.selected .song-number{color:var(--red)}.song-info{flex:1}.song-info strong{display:block;font:600 22px var(--serif);letter-spacing:2px;margin-bottom:7px}.song-info small{display:block;font-size:12px;color:var(--muted)}.song-level{font-size:12px;color:var(--muted);align-self:start;margin-top:5px;writing-mode:vertical-rl;letter-spacing:3px}.listening-note{padding:24px 14px 8px;margin-top:20px}.small-seal{border:1px solid #af8f68;color:#977751;font:19px var(--serif);padding:2px 4px;float:left;margin-right:10px}.listening-note h3{font:18px/1.8 var(--serif)}.listening-note p{font-size:14px;color:#75796c;margin:12px 0}.text-button{padding:3px 0;color:var(--red);font-size:14px}.library-foot{font-size:12px;color:#898d82;padding:24px 14px}.performance{background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:0 8px 30px #36472b04}.performance-head{display:flex;justify-content:space-between;align-items:center;padding:21px 26px 17px}.performance-head .eyebrow{font-size:12px;margin-bottom:2px}h2{font:500 25px/1.5 var(--serif);letter-spacing:2px}#song-subtitle{font:14px var(--sans);letter-spacing:1px;color:var(--muted)}.title-dot{padding:0 12px;color:#b8b4a4}.status-label{font-size:12px;padding:4px 12px;border:1px solid var(--line);border-radius:20px;color:var(--muted)}.toolbar{display:flex;gap:10px;align-items:center;justify-content:space-between;border-top:1px solid #eeeee4;border-bottom:1px solid #eeeee4;padding:12px 24px}.mode-switch{display:flex;background:#efefe8;border-radius:5px;padding:3px;gap:2px}.mode-switch button{font-size:14px;padding:5px 12px;color:#73796d;border-radius:3px;white-space:nowrap}.mode-switch .selected{background:var(--surface);color:var(--ink);box-shadow:0 1px 4px #172e1b15}.sound-controls{display:flex;gap:14px}.sound-controls label{font-size:12px;color:var(--muted);white-space:nowrap}.sound-controls select{border:0;background:transparent;color:var(--ink);font-size:14px;padding:4px 1px}.stage{height:295px;position:relative;background:linear-gradient(180deg,#f4f5ed,#eef2e8);overflow:hidden}canvas{display:block;width:100%;height:100%}.stage-center{pointer-events:none;position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column}.stage-glyph{font:58px var(--serif);color:#7b8c7866;margin:5px 0 12px}.stage-center p{font:20px var(--serif);letter-spacing:3px}.stage-center small{font-size:13px;color:var(--muted);margin-top:10px}.stage-top{position:absolute;top:17px;left:25px;right:25px;display:flex;justify-content:space-between;font-size:12px;color:#78866e}.hit-label{position:absolute;bottom:32px;right:8px;font-size:10px;writing-mode:vertical-rl;letter-spacing:2px;color:#a6ad9a}.piano{display:flex;height:79px;border-top:2px solid #96a48b;gap:1px;background:var(--line);padding:0 15px}.piano-key{flex:1;min-width:0;position:relative;background:#fdfcf7;padding:6px 0 3px;border-radius:0 0 4px 4px;box-shadow:inset 0 -3px 0 #e5e4d9;touch-action:manipulation}.piano-key .note-name{display:block;font:22px/1.1 var(--serif);margin:6px 0}.piano-key .key-letter{font:12px/1.5 Georgia,serif;color:#929484}.piano-key.expected{background:#eaded0;color:var(--red);box-shadow:inset 0 -4px 0 var(--red)}.piano-key.pressed{background:var(--red);color:white;box-shadow:inset 0 -4px 0 #762b23}.piano-key.pressed .key-letter{color:#edd6cc}.transport{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 24px 13px}.transport-buttons{display:flex;gap:8px}.primary-button{background:var(--red);color:#fff9ef;border:1px solid var(--red);border-radius:4px;padding:9px 24px;font-size:14px;letter-spacing:1px}.secondary-button{border:1px solid var(--line);border-radius:4px;padding:9px 14px;font-size:14px}.progress-detail{width:130px;font-size:12px;color:var(--muted);text-align:right}.progress-track{height:3px;background:#e9eadd;margin-top:7px}.progress-track>div{height:100%;width:0;background:var(--red);transition:width .2s}.performance-foot{display:flex;justify-content:space-between;align-items:center;padding:0 24px 18px;color:var(--muted);font-size:12px;gap:12px}.volume-control{display:flex;align-items:center;gap:8px;white-space:nowrap}.volume-control input{width:65px;accent-color:var(--green)}.below-note{display:flex;align-items:center;justify-content:center;gap:22px;margin:29px 0 30px}.below-note>span{font:14px var(--serif);letter-spacing:3px;color:var(--gold)}.below-note p{font-size:13px;color:var(--muted)}footer{max-width:1360px;margin:0 auto;padding:20px 3%;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:12px;color:#949787;gap:20px}.footer-divider{padding:0 14px}footer .text-button{font-size:12px;margin-left:20px}dialog{border:1px solid var(--line);border-radius:8px;padding:36px;max-width:620px;width:90%;background:var(--surface);color:var(--ink)}dialog::backdrop{background:#20302766;backdrop-filter:blur(3px)}.dialog-close{position:absolute;right:12px;top:8px;font-size:26px}.dialog-body{font-size:14px;margin-top:20px}.dialog-body a{color:var(--red)}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);padding:10px 24px;color:#fff;background:#263a32;border-radius:6px;opacity:0;transition:opacity .15s;pointer-events:none;z-index:5}#toast.visible{opacity:1}
@media(min-width:1600px){main{padding-top:48px}.stage{height:350px}}
@media(max-width:1100px){.header-note{display:none}.play-layout{grid-template-columns:230px minmax(0,1fr);gap:20px}.toolbar{flex-wrap:wrap;padding:10px 18px}.sound-controls{gap:12px}.performance-foot{flex-wrap:wrap}.song-card{padding:20px 10px}.song-info strong{font-size:20px}.song-info small{font-size:12px}.song-level{display:none}.below-note{gap:12px}.transport{flex-wrap:wrap}.progress-detail{width:100px}}
@media(max-width:760px){.site-header{height:auto;min-height:90px;padding:14px 5% 0;flex-wrap:wrap;gap:4px}.brand-name{font-size:23px}.brand-name small{font-size:10px}.seal{width:35px;height:41px}nav{height:47px;gap:12px}.nav-button{font-size:14px;padding:0 7px}.page-intro{margin-bottom:19px}.intro-side{display:none}main{padding:25px 4% 0}h1{font-size:25px;letter-spacing:1px}.play-layout{display:block}.library .section-label,.listening-note,.library-foot{display:none}#song-list{display:flex;gap:7px;margin-bottom:18px}.song-card{padding:14px 8px;min-height:82px;flex:1;border:1px solid var(--line);border-radius:5px;gap:6px}.song-number{font-size:14px}.song-info strong{font-size:18px;letter-spacing:1px;margin-bottom:4px}.song-info small{font-size:10px}.song-card.selected:before{display:none}.performance-head{padding:16px}.performance-head h2{font-size:23px}#song-subtitle{font-size:12px}.title-dot{padding:0 6px}.status-label{padding:3px 8px;font-size:10px}.toolbar{padding:10px 13px}.mode-switch button{padding:5px 11px}.sound-controls{width:100%;justify-content:space-between}.stage{height:280px}.stage-top{left:16px;right:16px}.stage-center p{font-size:18px}.stage-center small{font-size:12px}.piano{padding:0 7px;height:76px}.transport{padding:16px 13px;gap:12px}.primary-button{padding:9px 17px}.secondary-button{padding:9px 11px}.progress-detail{flex:1;min-width:80px}.performance-foot{padding:0 13px 16px;font-size:11px}.below-note{flex-wrap:wrap;text-align:center;margin:25px 0}.below-note>span{width:100%}.below-note p{font-size:12px}footer{font-size:11px;flex-wrap:wrap;justify-content:center;text-align:center;padding:17px}footer .text-button{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}
.instrument-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px}.instrument-card{background:var(--surface);border:1px solid var(--line);border-radius:7px;overflow:hidden}.instrument-image{height:245px;position:relative;background:#edece4;text-align:center;overflow:hidden}.instrument-image img{height:100%;max-width:100%;object-fit:contain}.instrument-image.guzheng img{width:100%;object-fit:cover}.instrument-image.dizi{background:#e5e1d5}.instrument-image.pipa{background:#f1f0ea}.instrument-index{position:absolute;bottom:12px;left:16px;background:#fffcf2e6;color:#655d4d;padding:3px 9px;font-size:11px;letter-spacing:2px}.instrument-body{padding:24px}.instrument-title{display:flex;align-items:center;justify-content:space-between}.instrument-title h2{font-size:31px;letter-spacing:4px}.instrument-title>span{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:2px 8px}.instrument-character{font-size:13px;color:var(--gold);margin:7px 0 18px}.instrument-body>p:not(.instrument-character){font-size:15px;line-height:1.9;color:#6d7567;min-height:115px}.listen-prompt{border-top:1px solid var(--line);padding-top:16px;margin-top:13px}.listen-prompt strong{font-size:13px;color:var(--red);font-weight:500}.listen-prompt p{font-size:14px;color:var(--muted);margin-top:5px;min-height:49px}.instrument-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:20px;flex-wrap:wrap}.instrument-actions .secondary-button{font-size:13px;padding:7px 12px}.instrument-actions .text-button{font-size:13px}details{margin-top:20px;font-size:13px;color:var(--muted)}summary{cursor:pointer}details p{margin:8px 0}.comparison-note{display:flex;gap:10px;margin:27px 0 35px;padding:20px 24px;background:#eeeee4;border-radius:6px}.comparison-note .small-seal{align-self:start;float:none;margin-top:3px}.comparison-note h3{font:19px var(--serif);margin-bottom:6px}.comparison-note p{font-size:14px;color:var(--muted)}.pent-surface{border:1px solid var(--line);border-radius:8px;background:var(--surface);overflow:hidden}.pent-visual{height:240px;background:linear-gradient(120deg,#eff2e7,#f4f3e9);position:relative}.pent-caption{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;pointer-events:none}.pent-caption span{font:38px var(--serif);letter-spacing:8px;color:#314b3ad9}.pent-caption p{margin-top:16px;font-size:13px;color:var(--muted);letter-spacing:2px}.five-keys{display:flex;min-height:230px}.five-key{flex:1;position:relative;border-right:1px solid var(--line);display:flex;align-items:center;flex-direction:column;padding:20px 7px;touch-action:manipulation}.five-key:last-child{border-right:0}.five-number{font:15px Georgia,serif;color:#a8aa9b}.five-key strong{font:42px var(--serif);margin:18px 0 13px;color:var(--ink)}.five-word{font-size:12px;color:var(--muted)}.five-key kbd{margin-top:17px;font:12px Georgia,serif;border:1px solid var(--line);padding:0 8px;border-radius:3px;color:var(--muted)}.five-key.playing{background:var(--red-soft)}.five-key.playing strong{color:var(--red)}.pent-controls{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:20px 25px;gap:15px}.pent-controls>span{font-size:13px;color:var(--muted)}.pent-controls>div{display:flex;gap:10px}.pent-explanation{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin:29px 0 40px}.pent-explanation h3{font:20px/1.8 var(--serif)}.pent-explanation p{clear:both;color:var(--muted);font-size:14px;margin-top:12px;line-height:1.9}.dialog-body h3{margin:20px 0 8px}.dialog-body li{margin-bottom:14px}.dialog-body ul{padding-left:20px}
@media(max-width:1000px){.instrument-grid{gap:14px}.instrument-body{padding:19px}.instrument-image{height:215px}.instrument-body>p:not(.instrument-character){min-height:150px}.instrument-actions{flex-direction:column;align-items:stretch;text-align:center}.pent-controls{flex-wrap:wrap}}
@media(max-width:760px){.instrument-grid{grid-template-columns:1fr}.instrument-card{display:grid;grid-template-columns:32% minmax(0,1fr)}.instrument-image{height:100%;min-height:340px}.instrument-image img{object-fit:contain;width:100%}.instrument-image.guzheng img{object-fit:cover}.instrument-index{writing-mode:vertical-rl;bottom:auto;top:13px;left:8px;font-size:10px;letter-spacing:1px}.instrument-body{padding:18px}.instrument-title h2{font-size:27px}.instrument-body>p:not(.instrument-character){min-height:0;font-size:14px}.instrument-character{font-size:12px}.listen-prompt p{font-size:13px;min-height:0}.instrument-actions{flex-direction:row;flex-wrap:wrap}.comparison-note{padding:16px}.comparison-note p{font-size:13px}.pent-visual{height:210px}.pent-caption span{font-size:32px}.five-keys{min-height:190px}.five-key{padding:15px 3px}.five-key strong{font-size:34px}.five-word{display:none}.five-key kbd{margin-top:15px}.pent-controls{padding:18px}.pent-controls>span{font-size:12px}.pent-controls .primary-button{font-size:13px}.pent-explanation{grid-template-columns:1fr;gap:23px;margin-bottom:25px}.pent-explanation p{font-size:14px}}
@media(max-width:760px){.song-number{display:none}.song-info strong{font-size:clamp(15px,4.2vw,20px);white-space:nowrap;letter-spacing:0}.song-info small{font-size:11px;white-space:nowrap}.library .listening-note{display:block;margin:-9px 0 12px;padding:0;text-align:right}.library .listening-note .small-seal,.library .listening-note h3,.library .listening-note p{display:none}.library .listening-note .text-button{font-size:13px}.stage-center small{max-width:90%;text-align:center}.stage-center p{max-width:92%;text-align:center}.performance-head{gap:8px}.status-label{white-space:nowrap}.performance-head h2{white-space:nowrap}#song-subtitle{display:inline}.sound-controls label{font-size:12px}}
@media(max-width:350px){#song-subtitle,.title-dot{display:none}.song-info small{font-size:10px}.performance-head .eyebrow{letter-spacing:1px}.primary-button{padding:9px 13px}.performance-foot .volume-control{width:100%;justify-content:flex-end}.instrument-card{display:block}.instrument-image{height:210px;min-height:0}.instrument-image img{width:auto}.instrument-image.guzheng img{width:100%}}
.technique-strip{display:flex;flex-wrap:wrap;justify-content:space-between;gap:5px 16px;padding:9px 24px;background:#faf8f0;color:#7d7968;font-size:12px;border-bottom:1px solid var(--line)}.technique-strip span:first-child{color:#9f3d31}.piano-key{user-select:none}.five-key{user-select:none}@media(max-width:760px){.technique-strip{padding:9px 13px;font-size:12px}.technique-strip span{width:100%}}

.technique-choice{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px}.technique-choice label{white-space:nowrap}.technique-choice select{border:1px solid var(--line);border-radius:4px;background:var(--surface);color:var(--ink);font-size:12px;padding:2px 5px}.articulation-guide{margin:12px 0}.articulation-guide dt{color:var(--ink);margin-top:8px}.articulation-guide dd{margin:4px 0 0;line-height:1.8}.instrument-body details a{color:var(--green)}

/* A compact five-song library and a separate accompaniment desk. */
.library,.performance,.song-info{min-width:0}
.song-card{min-height:88px;padding:17px 11px}
.song-info strong{font-size:21px;margin-bottom:5px}
.song-info small{overflow-wrap:anywhere}
.song-card.selected:before{top:18px;bottom:18px}
.backing-strip{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px 20px;padding:13px 24px;background:linear-gradient(100deg,#f1f3e9,#faf9f2);border-bottom:1px solid var(--line)}
.backing-summary{flex:1 1 190px;min-width:0}
.backing-heading{display:flex;align-items:center;flex-wrap:wrap;gap:9px;font:15px/1.5 var(--serif);letter-spacing:1px}
.section-pill{display:inline-block;max-width:100%;padding:1px 7px;border:1px solid #cbd4c3;border-radius:3px;color:var(--green);font:11px/1.7 var(--sans);letter-spacing:.5px;overflow-wrap:anywhere}
#backing-label{margin-top:4px;font-size:11px;line-height:1.6;color:var(--muted);overflow-wrap:anywhere}
.backing-controls{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:10px 14px;min-width:0;max-width:100%;font-size:12px}
.backing-toggle,.backing-volume{display:inline-flex;align-items:center;gap:7px;white-space:nowrap}
.backing-toggle{cursor:pointer;min-height:32px}
.backing-toggle input{width:15px;height:15px;margin:0;accent-color:var(--green);cursor:pointer;flex-shrink:0}
.backing-volume{color:var(--muted)}
.backing-volume input{width:76px;max-width:100%;margin:0;accent-color:var(--green);cursor:pointer}
.backing-listen{padding:6px 11px;min-height:34px;border:1px solid #b6c4af;border-radius:4px;color:var(--green);background:#fffdf8a6;font-size:12px;white-space:nowrap}
.backing-listen:hover:not(:disabled){background:#e5ebdc;border-color:var(--green)}
.backing-listen:disabled,.backing-listen[aria-disabled="true"]{opacity:1;color:#999e91;border-color:#d7dbcf;background:#f4f4eb;cursor:not-allowed}
.backing-controls input:disabled{opacity:.45;cursor:not-allowed}
.backing-toggle:has(input:disabled){color:#969b8e;cursor:not-allowed}
.backing-strip.is-unavailable .backing-controls{color:#969b8e}
@media(max-width:1100px){.backing-strip{padding:12px 18px}.backing-controls{gap:9px 12px}}
@media(max-width:760px){
  #song-list{width:100%;max-width:100%;overflow-x:auto;overflow-y:hidden;gap:8px;padding:1px 1px 10px;margin-bottom:15px;scroll-snap-type:x proximity;scroll-padding-inline:1px;overscroll-behavior-x:contain;scrollbar-width:thin;scrollbar-color:#c4c7b8 transparent;-webkit-overflow-scrolling:touch}
  #song-list::-webkit-scrollbar{height:3px}
  #song-list::-webkit-scrollbar-thumb{background:#c4c7b8;border-radius:3px}
  .song-card{flex:0 0 clamp(180px,46vw,230px);width:auto;min-width:0;min-height:78px;padding:13px 12px;scroll-snap-align:start}
  .song-info strong{font-size:19px;margin-bottom:4px}
  .song-info small{font-size:11px;white-space:normal;line-height:1.6}
  .backing-strip{padding:12px 13px;gap:8px}
  .backing-summary{flex-basis:100%}
  .backing-heading{font-size:14px}
  .backing-controls{width:100%;justify-content:space-between;gap:8px 12px}
  .backing-toggle,.backing-listen{min-height:40px}
  .backing-volume input{width:65px;min-height:32px}
  .backing-listen{padding:6px 10px}
  .performance-head>div:first-child{min-width:0}
  .performance-head h2{white-space:normal;overflow-wrap:anywhere}
  #song-subtitle{white-space:nowrap}
}
@media(max-width:350px){.backing-controls{gap:5px 8px}.backing-volume input{width:54px}.backing-listen{padding-inline:8px}}

/* ==== 交互与动效增强 (OpenClaw 2026-10-13) ==== */
@keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.page.active{animation:pageIn .32s cubic-bezier(.22,.61,.36,1)}
@keyframes barIn{from{transform:scaleY(.15)}to{transform:scaleY(1)}}
.song-card{transition:background .25s ease,box-shadow .25s ease}
.song-card.selected:before{transform-origin:center;animation:barIn .28s cubic-bezier(.22,.61,.36,1)}
.piano-key{transition:background .12s ease,color .12s ease,transform .09s ease,box-shadow .09s ease}
.piano-key.pressed{transform:translateY(2px);box-shadow:inset 0 -1px 0 #762b23}
.piano-key.expected{box-shadow:inset 0 -4px 0 var(--red),0 0 0 1px #9f3d3166}
#toast{transform:translateX(-50%) translateY(12px);transition:opacity .2s ease,transform .2s ease}
#toast.visible{transform:translateX(-50%) translateY(0)}
.stage:after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:radial-gradient(120% 80% at 18% 0%,#ffffff8c,transparent 60%),radial-gradient(90% 70% at 92% 100%,#dfe8d68f,transparent 65%);animation:stageDrift 16s ease-in-out infinite alternate}
@keyframes stageDrift{from{transform:translate3d(0,0,0) scale(1);opacity:.85}to{transform:translate3d(-2.5%,1.5%,0) scale(1.06);opacity:1}}
.stage>canvas{position:relative;z-index:1}
.stage-center,.stage-top,.hit-label{z-index:2}
@keyframes stampIn{0%{transform:scale(2.4) rotate(-14deg);opacity:0}55%{transform:scale(.94) rotate(-6deg);opacity:1}100%{transform:scale(1) rotate(-4deg);opacity:1}}
#stage-message.stamp-in .stage-glyph{display:inline-block;color:#9f3d31;animation:stampIn .5s cubic-bezier(.3,1.5,.5,1) both}
.five-key.playing{background:color-mix(in srgb,var(--key,#9f3d31) 14%,#fffdf8)}
.five-key.playing strong{color:var(--key,#9f3d31)}
.five-key.playing kbd{border-color:color-mix(in srgb,var(--key,#9f3d31) 45%,var(--line))}
#protocol-warning{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:20;max-width:min(680px,92vw);display:flex;align-items:center;gap:14px;padding:14px 18px;background:#263a32;color:#f4f2e9;border-radius:8px;box-shadow:0 12px 34px #1a2a2352;font-size:13px;line-height:1.7;animation:pageIn .3s ease}
#protocol-warning strong{color:#f0c9a8;white-space:nowrap}
#protocol-warning code{background:#ffffff1f;padding:1px 5px;border-radius:3px}
#protocol-warning button{margin-left:auto;padding:6px 12px;border:1px solid #ffffff4d;border-radius:5px;color:#f4f2e9;background:transparent;white-space:nowrap}
@media(max-width:760px){#protocol-warning{flex-wrap:wrap}#protocol-warning button{margin-left:0}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important}}

/* --- 低延迟触控、判定校准与最佳成绩 --- */
#note-canvas,.wave-canvas{touch-action:none}
.piano-key,.five-key{touch-action:none}
.performance-foot{flex-wrap:wrap;gap:10px 16px}
.foot-controls{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:10px 16px;min-width:0}
.best-score{padding:2px 10px;border:1px solid var(--line);border-radius:20px;color:var(--gold);white-space:nowrap}
.calibration-control{display:flex;align-items:center;gap:7px;white-space:nowrap;color:var(--muted)}
.calibration-control input{width:86px;max-width:100%;accent-color:var(--red);cursor:pointer}
#calibration-value{min-width:52px;color:var(--ink);font-variant-numeric:tabular-nums}
#calibration-auto{white-space:nowrap;font-size:12px}
@media(max-width:1100px){.foot-controls{justify-content:flex-start}}
@media(max-width:760px){.foot-controls{width:100%;justify-content:space-between;gap:8px 12px}.foot-controls .volume-control{width:100%;justify-content:flex-end}}
@media(max-width:350px){.calibration-control input{width:64px}}

/* ==== 入场：全屏 16:9 宣纸山水 (2026-10-21) ==== */
.intro-overlay{position:fixed;inset:0;z-index:70;overflow:hidden;display:grid;place-items:center;
  background:#efe8d8;color:#22342c;transition:opacity .75s ease .3s,visibility 0s linear 1.05s}
/* 16:9 舞台：按视口取最大 16:9 区域；屏幕本身是 16:9 时正好铺满全屏 */
.intro-stage{position:relative;overflow:hidden;display:grid;place-items:center;
  width:min(100vw,177.7778vh);height:min(100vh,56.25vw);
  --sw:min(100vw,177.7778vh);--sh:min(100vh,56.25vw);
  background:radial-gradient(122% 88% at 50% 4%,#fdfbf4 0%,#f8f4e8 44%,#eee7d5 76%,#e2d8c1 100%);
  transition:transform .95s cubic-bezier(.4,0,.2,1)}
.intro-stage::before{content:"";position:absolute;inset:0;z-index:6;pointer-events:none;opacity:.13;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
  background-size:180px 180px}
.intro-stage::after{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(ellipse at 50% 44%,transparent 40%,#8d816714 74%,#5f543f2b 100%)}
.intro-overlay.is-parting{opacity:0;visibility:hidden;pointer-events:none}
.intro-overlay.is-parting .intro-stage{transform:scale(1.035)}

/* ---- 山水场景 ---- */
.intro-scene{position:absolute;inset:0;z-index:1;pointer-events:none;transition:opacity .8s ease}
.intro-overlay.is-parting .intro-scene{opacity:0}
.intro-sun{position:absolute;right:19%;top:15%;width:clamp(76px,calc(var(--sw)*.105),142px);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle at 38% 34%,#f0c39c,#dd9a72 56%,#c4765a);
  opacity:.72;filter:blur(.4px);box-shadow:0 0 70px 26px #d59a6a3d;animation:introSun 9s ease-in-out infinite alternate}
@keyframes introSun{from{transform:translateY(0)}to{transform:translateY(9px)}}
.intro-mountains{position:absolute;left:0;bottom:0;width:100%;height:min(calc(var(--sh)*.78),760px);display:block}
.ink--far{fill:#7d9080;opacity:.3}
.ink--mid{fill:#57715f;opacity:.44}
.ink--near{fill:#2c473a;opacity:.78}
.intro-mist{position:absolute;left:-10%;width:120%;height:clamp(90px,calc(var(--sh)*.16),170px);border-radius:50%;
  background:radial-gradient(closest-side,#fdfbf4e6,transparent 72%);filter:blur(22px);opacity:.9}
.intro-mist--a{top:44%;animation:introMistA 22s ease-in-out infinite alternate}
.intro-mist--b{top:66%;height:clamp(70px,calc(var(--sh)*.13),140px);opacity:.75;animation:introMistB 28s ease-in-out infinite alternate}
@keyframes introMistA{from{transform:translateX(-4%) scaleY(1)}to{transform:translateX(5%) scaleY(1.12)}}
@keyframes introMistB{from{transform:translateX(6%) scaleY(1.08)}to{transform:translateX(-5%) scaleY(.94)}}

/* ---- 两侧竖排题字 ---- */
.intro-aside{position:absolute;top:50%;z-index:4;margin:0;writing-mode:vertical-rl;text-orientation:upright;
  font:400 clamp(11px,calc(var(--sw)*.0102),14px)/2.4 var(--serif);letter-spacing:.55em;color:#5d6b5d99;text-align:center;
  transform:translateY(-50%);animation:introFadeIn 1.2s ease .7s both}
.intro-aside--left{left:clamp(74px,calc(var(--sw)*.172),258px)}
.intro-aside--right{right:clamp(74px,calc(var(--sw)*.172),258px);color:#5d6b5d8c}
.intro-aside--right span{display:block}
.intro-aside--right span+span{margin-block-start:clamp(12px,calc(var(--sw)*.016),26px)}
@keyframes introFadeIn{from{opacity:0}to{opacity:1}}

/* ---- 中央主体 ---- */
.intro-core{position:relative;z-index:5;text-align:center;padding:0 calc(var(--sw)*.1);
  animation:introCoreIn 1.1s cubic-bezier(.22,.61,.36,1) .18s both}
.intro-overlay.is-parting .intro-core{animation:none;opacity:0;transform:translateY(-16px);
  transition:opacity .45s ease,transform .45s ease}
@keyframes introCoreIn{from{opacity:0;transform:translateY(18px);filter:blur(7px)}to{opacity:1;transform:none;filter:blur(0)}}
.intro-eyebrow{display:flex;align-items:center;justify-content:center;gap:clamp(10px,calc(var(--sw)*.014),20px);
  font:400 12px/1 var(--sans);letter-spacing:.44em;text-indent:.44em;color:#8a7f66}
.intro-eyebrow span{width:clamp(24px,calc(var(--sw)*.04),58px);height:1px;background:linear-gradient(90deg,transparent,#b0a184)}
.intro-eyebrow span:last-child{background:linear-gradient(90deg,#b0a184,transparent)}
.intro-main{display:flex;align-items:center;justify-content:center;gap:clamp(10px,calc(var(--sw)*.015),22px);margin-top:clamp(16px,calc(var(--sh)*.024),28px)}
.intro-title{margin:0;font:500 clamp(44px,calc(var(--sw)*.08),102px)/1.14 var(--serif);
  letter-spacing:clamp(.1em,calc(var(--sw)*.022),.26em);text-indent:clamp(.1em,calc(var(--sw)*.022),.26em);color:#1e332b;
  text-shadow:0 2px 22px #fdfbf480,0 0 1px #1e332b1a}
.intro-seal{display:inline-grid;place-items:center;flex:none;width:clamp(40px,calc(var(--sw)*.044),58px);height:clamp(44px,calc(var(--sw)*.049),64px);
  border:1px solid var(--red);outline:1px solid var(--red);outline-offset:-5px;border-radius:4px;
  color:var(--red);font:clamp(20px,calc(var(--sw)*.023),29px) var(--serif);background:#9f3d310a;
  transform:rotate(-4deg) translateY(-.12em);box-shadow:0 4px 14px #9f3d311f}
.intro-actions{margin-top:clamp(30px,calc(var(--sh)*.05),56px)}
.intro-enter{padding:13px clamp(34px,calc(var(--sw)*.04),52px);border:1px solid #7d2b22;border-radius:3px;color:#fdf8ec;
  font:14px/1 var(--sans);letter-spacing:.5em;text-indent:.5em;
  background:linear-gradient(180deg,#a8493b,#8d3328);
  box-shadow:inset 0 0 0 1px #ffffff26,0 12px 28px -10px #7d2b2280;transition:transform .28s ease,box-shadow .28s ease,background .28s ease}
.intro-enter:hover{filter:none;transform:translateY(-2px);background:linear-gradient(180deg,#b3523f,#9a3a2c);
  box-shadow:inset 0 0 0 1px #ffffff33,0 18px 34px -12px #7d2b2299}
.intro-enter:active{transform:translateY(0)}
.intro-hint{margin:16px 0 0;font-size:11.5px;letter-spacing:.34em;text-indent:.34em;color:#948b76;
  animation:introHintPulse 2.8s ease-in-out infinite}
@keyframes introHintPulse{0%,100%{opacity:.55}50%{opacity:1}}
.intro-credit{position:absolute;right:clamp(20px,calc(var(--sw)*.034),48px);bottom:clamp(14px,calc(var(--sh)*.03),32px);z-index:5;margin:0;
  font-size:11px;letter-spacing:.18em;color:#8b8271;opacity:.85}

/* 竖屏时 16:9 舞台会退化成窄条，改为满屏显示 */
@media(max-aspect-ratio:1/1){
  .intro-stage{width:100vw;height:100vh;--sw:100vw;--sh:100vh}
}
@media(max-width:900px){
  .intro-aside{display:none}
}
@media(max-width:760px){
  .intro-core{padding:0 calc(var(--sw)*.08)}
  .intro-title{letter-spacing:.14em;text-indent:.14em}
  .intro-eyebrow{font-size:10.5px;letter-spacing:.3em;text-indent:.3em}
  .intro-enter{padding:12px 34px;font-size:13px}
  .intro-credit{right:50%;transform:translateX(50%);bottom:16px;font-size:10px;white-space:nowrap}
  .intro-sun{right:12%;top:13%}
}
@media(prefers-reduced-motion:reduce){
  .intro-sun,.intro-mist,.intro-hint{animation:none!important}
  .intro-core{animation:none!important;opacity:1!important;transform:none!important;filter:none!important}
  .intro-overlay{transition:opacity .12s linear,visibility 0s linear .14s}
  .intro-stage{transition:none}
  .intro-scene{transition:none}
}

/* ==== 乐器小馆：多图轮播 + Ken Burns 动效 (2026-10-14) ==== */
.instrument-gallery{position:absolute;inset:0;overflow:hidden}
#page-instruments .instrument-gallery img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transform:scale(1.04);transition:opacity 1.15s ease,transform 5.2s ease-out}
#page-instruments .instrument-gallery img.is-active{opacity:1;transform:scale(1.16)}
.gallery-dots{position:absolute;right:14px;bottom:13px;display:flex;gap:5px;z-index:2}
.gallery-dots i{width:5px;height:5px;border-radius:50%;background:#fff9ef99;box-shadow:0 0 0 1px #2b3a3255}
.gallery-dots i.on{background:#fff9ef;width:14px;border-radius:3px}
@keyframes cardRise{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
#page-instruments .instrument-card{animation:cardRise .55s cubic-bezier(.22,.61,.36,1) both;transition:box-shadow .3s ease,transform .3s ease}
#page-instruments .instrument-card:nth-child(2){animation-delay:.08s}
#page-instruments .instrument-card:nth-child(3){animation-delay:.16s}
#page-instruments .instrument-card:hover{transform:translateY(-3px);box-shadow:0 14px 38px #2c3f341f}
@media(prefers-reduced-motion:reduce){
  #page-instruments .instrument-card{animation:none!important}
  #page-instruments .instrument-gallery img{transition:none!important;transform:none!important}
  #page-instruments .instrument-gallery img:not(.is-active){display:none}
}

/* ==== 五音之间：独立音色选择 (2026-10-14) ==== */
.pent-timbre{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);white-space:nowrap}
.pent-timbre select{border:1px solid var(--line);border-radius:4px;background:var(--surface);color:var(--ink);font-size:13px;padding:4px 6px}
@media(max-width:1000px){.pent-controls{padding:16px 18px}.pent-controls-right{flex-wrap:wrap}}
@media(max-width:760px){.pent-timbre{font-size:12px}}