/* Amu Music · 乐理学堂 */
:root{
  --bg:#0E1116; --bg2:#111823; --card:#141C27; --card2:#1A2432;
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.16);
  --tx:#E8EDF2; --tx2:#9AA7B6; --tx3:#6C7A8A;
  --c:#FFC94D; --cSoft:rgba(255,201,77,.14); --cLine:rgba(255,201,77,.4);
  --radius:14px; --font:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
html[data-theme="light"]{
  --bg:#F4F6FA; --bg2:#E9EEF6; --card:#FFFFFF; --card2:#F4F7FB;
  --line:rgba(16,46,80,.12); --line2:rgba(16,46,80,.22);
  --tx:#102E50; --tx2:#506985; --tx3:#8A9AAC;
  --c:#C18A12; --cSoft:rgba(193,138,18,.12); --cLine:rgba(193,138,18,.35);
}
html[data-accent="blue"]{--c:#2ED9FF;--cSoft:rgba(46,217,255,.14);--cLine:rgba(46,217,255,.4)}
html[data-accent="blue"][data-theme="light"]{--c:#0E7FA8;--cSoft:rgba(14,127,168,.12);--cLine:rgba(14,127,168,.32)}
html[data-accent="purple"]{--c:#A78BFA;--cSoft:rgba(167,139,250,.14);--cLine:rgba(167,139,250,.4)}
html[data-accent="purple"][data-theme="light"]{--c:#6D4BD8;--cSoft:rgba(109,75,216,.12);--cLine:rgba(109,75,216,.32)}
html{background:var(--bg);scroll-behavior:smooth}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--tx);font-family:var(--font);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
/* 页脚钉底：实验台内容矮于视口时，footer 仍贴住视口底（旧版吊在半空、下面一片空白） */
body{min-height:100vh;display:flex;flex-direction:column}
main{flex:1;width:100%}
footer.shell{margin:26px auto 0;width:min(1160px,calc(100% - 48px));border-top:1px solid var(--line);padding:16px 0 20px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--tx3);font-size:12px}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0;line-height:1.25;letter-spacing:-.01em}
h1{font-size:clamp(28px,3.4vw,42px)}
h2{font-size:20px}
h3{font-size:15px}
p{margin:0;color:var(--tx2)}
button{font:inherit;cursor:pointer;border:0;color:inherit;background:none}
button:disabled{opacity:.45;cursor:not-allowed}
select,input[type=text]{font:inherit;color:var(--tx);background:var(--card2);border:1px solid var(--line);border-radius:8px;padding:8px 10px}
html[data-theme=light] select{color:var(--tx)}
.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.quiet{color:var(--tx3);font-size:13px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ---------- 顶栏 ---------- */
/* 顶栏样式统一由 /nav-common.css 提供（与官网主页同源），此处不再自定义 */

/* ---------- 首页 ---------- */
.lab-intro{padding-block:56px 34px;display:grid;gap:16px;max-width:760px}
.lab-intro p{font-size:17px;line-height:1.85}
.lab-intro b{color:var(--c)}
.free-badge{display:inline-flex;align-items:center;gap:8px;justify-self:start;margin-top:8px;font-size:13px;color:var(--c);background:var(--cSoft);border:1px solid var(--cLine);border-radius:999px;padding:6px 14px}
.tool-hub{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:22px;padding-bottom:20px}
.progression-feature{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:grid;gap:18px;align-content:start}
.progression-feature h2 a:hover{color:var(--c)}
.featured-example{background:var(--card2);border-radius:12px;padding:18px}
.example-title{display:flex;align-items:baseline;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.example-title strong{font-size:26px;color:var(--c)}
.example-title span{font-size:13px;color:var(--tx3)}
.featured-chords{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.featured-chords span{display:grid;gap:2px;justify-items:center;min-width:64px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:var(--card);font-size:12px;color:var(--tx3);transition:.18s}
.featured-chords span small{font-size:11px}
.featured-chords span strong{font-size:15px;color:var(--tx)}
.featured-chords span.active{border-color:var(--c);background:var(--cSoft)}
.featured-chords span.active strong{color:var(--c)}
.feature-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.primary{display:inline-flex;align-items:center;justify-content:center;background:var(--c);color:#14100A;font-weight:650;min-height:42px;border-radius:9px;padding:9px 18px;font-size:14px;white-space:nowrap}
.primary:hover{filter:brightness(1.06)}
.primary[aria-pressed=true]{background:var(--cSoft);color:var(--c);box-shadow:inset 0 0 0 1px var(--cLine)}
.subtle{font-size:13px;color:var(--tx3)}
.subtle:hover{color:var(--c)}
.metronome-control{display:inline-flex;align-items:center;gap:7px;min-height:42px;font-size:14px;color:var(--tx2)}
.metronome-control input{width:16px;height:16px;accent-color:var(--c)}
.num-toggle{min-height:38px;padding:7px 14px;border-radius:8px;border:1px solid var(--line);background:var(--card2);font-size:13px;cursor:pointer}
.num-toggle[aria-pressed=true]{border-color:var(--cLine);background:var(--cSoft);color:var(--c)}
.preview-status{font-size:12px;color:var(--tx3);min-height:20px}
.tool-companions{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-content:start}
.tool-link{display:flex;flex-direction:column;justify-content:space-between;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;min-height:150px;transition:.18s}
.tool-link:hover{border-color:var(--cLine);background:var(--card2)}
.tool-link h2{font-size:16px;margin-bottom:6px}
.tool-link p{font-size:13px;line-height:1.6}
.tool-example{display:grid;gap:4px;border-top:1px solid var(--line);padding-top:12px}
.tool-example strong{font-size:17px;color:var(--c)}
.tool-example span{font-size:12px;color:var(--tx3)}
.tool-action{font-size:12px;color:var(--c);margin-top:4px}

.catalog{padding-block:36px 60px}
.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:18px;flex-wrap:wrap}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.filter-row button{font-size:13px;padding:7px 14px;border-radius:999px;border:1px solid var(--line);color:var(--tx2)}
.filter-row button[aria-pressed=true]{background:var(--cSoft);border-color:var(--cLine);color:var(--c)}
.catalog-group{display:grid;grid-template-columns:190px minmax(0,1fr);gap:20px;padding:22px 0;border-top:1px solid var(--line)}
.group-label h3{font-size:16px}
.group-label p{font-size:13px;margin-top:6px}
.experiment-entry{display:grid;grid-template-columns:minmax(0,1fr) 96px 20px;gap:14px;align-items:center;padding:14px 16px;border:1px solid var(--line);border-radius:12px;margin-bottom:8px;transition:.16s}
.experiment-entry:hover{border-color:var(--cLine);background:var(--card2)}
.experiment-entry h3{font-size:15px;margin-bottom:3px}
.experiment-entry p{font-size:13px}
.experiment-entry .quiet{font-size:12px;text-align:right}
.entry-arrow{color:var(--tx3);text-align:right}
.experiment-entry .goal-label{display:block;font-size:11px;color:var(--tx3);letter-spacing:.04em;margin:3px 0 2px}
.experiment-entry .done-badge{display:inline-block;font-size:11px;color:var(--c);border:1px solid var(--cLine);border-radius:999px;padding:1px 8px;margin-bottom:5px;font-weight:500}
.experiment-entry.done{border-left:3px solid var(--c)}
.progress-strip{display:flex;align-items:center;gap:12px;margin:4px 0 18px;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card2)}
.progress-strip .lp-label{font-size:13px;font-weight:500;white-space:nowrap}
.progress-strip .lp-bar{flex:1;height:8px;border-radius:999px;background:var(--line);overflow:hidden}
.progress-strip .lp-bar i{display:block;height:100%;background:var(--c);transition:width .3s}
@media(max-width:900px){.tool-hub{grid-template-columns:1fr}.catalog-group{grid-template-columns:1fr;gap:10px}.experiment-entry{grid-template-columns:1fr 80px;}.experiment-entry .entry-arrow{display:none}}

/* ---------- 实验台 ---------- */
#viewLab{padding-top:26px}
.experiment-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding-block:8px 26px;flex-wrap:wrap}
.experiment-heading p{max-width:680px;margin-top:10px;font-size:15px;line-height:1.8}
.small-button{background:var(--card2);border:1px solid var(--line);border-radius:8px;padding:7px 13px;font-size:12px;color:var(--tx2);display:inline-block}
.small-button:hover{color:var(--c);border-color:var(--cLine)}
.workspace{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:26px;align-items:start;padding-bottom:70px}
.desk{min-width:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px 24px;overflow:hidden}
.desk-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px}
.desk-toolbar h2{font-size:17px;font-weight:600}
.play-status{font-size:12px;color:var(--tx3)}
.notebook{position:sticky;top:92px;display:grid;gap:0;align-content:start}
.notebook h2{font-size:14px;font-weight:650}
.notebook p{font-size:13px;line-height:1.85;margin-top:8px}
.task-note{padding:4px 0 18px;border-bottom:1px solid var(--line)}
.observation{padding:18px 0;border-bottom:1px solid var(--line);min-height:96px}
.observation .readout{color:var(--c);font-size:14px;line-height:1.8;margin-top:10px}
.observation .readout strong{display:block;font-size:26px;font-weight:650;line-height:1.3;margin-bottom:6px;color:var(--c)}
.why-note{padding-block:18px;border-bottom:1px solid var(--line)}
.challenge{border-top:1px solid var(--line);padding-top:16px;font-size:13px}
.challenge summary{cursor:pointer;font-weight:600}
.challenge .opt{display:block;width:100%;text-align:left;background:var(--card2);border:1px solid var(--line);border-radius:8px;padding:10px;margin-top:8px;font-size:12px}
.challenge .opt[aria-pressed=true]{border-color:var(--cLine);background:var(--cSoft);color:var(--c)}
@media(max-width:1000px){.workspace{grid-template-columns:1fr}.notebook{position:static;display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.task-note{grid-column:1/-1}.challenge{grid-column:1/-1}}

/* ---------- 通用控件 ---------- */
.option-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.option-row button{min-height:38px;padding:7px 12px;border-radius:8px;border:1px solid var(--line);background:var(--card2);font-size:13px}
.option-row button[aria-pressed=true]{border-color:var(--cLine);background:var(--cSoft);color:var(--c)}
.control-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px 18px;margin-top:14px}
.control{display:grid;gap:6px}
.control label{font-size:12px;color:var(--tx3);display:flex;justify-content:space-between;gap:8px}
.control label b{color:var(--c);font-weight:600}
.control select,.control input[type=range]{width:100%}
input[type=range]{accent-color:var(--c);height:22px}
.transport{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.transport .play{min-height:40px;padding:8px 18px}
.tempo-grid{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.hint{font-size:12px;color:var(--tx3);margin-top:10px;line-height:1.7}

/* 键盘 */
.kb-wrap{position:relative;height:148px;margin-top:6px;touch-action:manipulation}
.kb-white{display:flex;height:100%;gap:2px}
.kb-w{flex:1;border-radius:0 0 6px 6px;background:var(--card2);border:1px solid var(--line);position:relative;display:flex;align-items:flex-end;justify-content:center;padding-bottom:7px;font-size:11px;color:var(--tx3)}
.kb-w.on{background:var(--c);color:#14100A;border-color:var(--c)}
html[data-theme=light] .kb-w{background:#fff;border-color:var(--line2)}
.kb-b{position:absolute;top:0;width:58px;height:62%;border-radius:0 0 5px 5px;background:#0B1017;border:1px solid rgba(0,0,0,.6);z-index:2;display:flex;align-items:flex-end;justify-content:center;padding-bottom:6px;font-size:11px;color:#8A94A2}
.kb-b.on{background:var(--c)}
html[data-theme=light] .kb-b{background:#2A3350}
.kb-tag{position:absolute;top:-24px;left:0;font-size:11px;color:var(--tx3)}
.chord-readout{display:flex;gap:10px;align-items:baseline;flex-wrap:wrap;margin-bottom:12px}
.chord-readout strong{font-size:28px;color:var(--c)}
.chord-readout span{font-size:13px;color:var(--tx3)}
.chord-readout em{font-style:normal;font-size:13px;color:var(--tx2);background:var(--card2);border:1px solid var(--line);border-radius:8px;padding:5px 10px}

/* 序列器网格 */
.seq{overflow-x:auto}
.seq-grid{display:grid;grid-template-columns:34px repeat(16,minmax(0,1fr));gap:3px;min-width:640px}
.seq-head{height:18px}
.seq-head i{display:block;height:6px;width:6px;border-radius:50%;background:var(--line2);margin:auto}
.seq-head i.beat{background:var(--c)}
.seq-cell{height:34px;border-radius:6px;background:var(--card2);border:1px solid var(--line);padding:0;min-width:0}
.seq-cell.beat{border-left:2px solid var(--cLine)}
.seq-cell.on{background:var(--c);border-color:var(--c)}
.seq-cell.kick.on{background:var(--c)}
.seq-cell.snare.on{background:#7DD3A8;border-color:#7DD3A8}
.seq-cell.hat.on{background:#8AB4FF;border-color:#8AB4FF}
.seq-cell.bass.on{background:#FF9E80;border-color:#FF9E80}
.seq-cell.playing{outline:2px solid var(--cLine)}
.by-cells{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 6px}
.by-cell{flex:1;min-width:64px;min-height:74px;border-radius:10px;background:var(--card2);border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;transition:transform .08s, background .12s, border-color .12s}
.by-cell strong{font-size:20px}
.by-cell small{font-size:11px;color:var(--tx3)}
.by-cell[data-lab="板"]{border-top:3px solid var(--c)}
.by-cell[data-lab="中眼"]{border-top:3px solid var(--cLine)}
.by-cell.active{background:var(--c);color:#fff;border-color:var(--c)}
.by-cell.active small{color:rgba(255,255,255,.82)}
.fm-lanes{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 6px}
.fm-lane{flex:1;min-width:58px;min-height:66px;border-radius:10px;background:var(--card2);border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;transition:background .12s, border-color .12s}
.fm-lane strong{font-size:19px}
.fm-lane small{font-size:10px;color:var(--tx3)}
.fm-lane.on{background:var(--c);color:#fff;border-color:var(--c)}
.fm-lane.on small{color:rgba(255,255,255,.8)}
.fm-lane.good{background:#2E9E6B;border-color:#2E9E6B;color:#fff}
.fm-lane.okhit{background:#B8862B;border-color:#B8862B;color:#fff}
.fm-lane.miss{opacity:.45;border-style:dashed}
.fm-pads{display:flex;gap:12px;margin:16px 0 4px}
.fm-pad{flex:1;min-height:88px;border-radius:12px;background:var(--card2);border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;cursor:pointer;user-select:none;touch-action:manipulation;transition:transform .06s, background .12s, border-color .12s}
.fm-pad strong{font-size:24px;color:var(--c)}
.fm-pad small{font-size:11px;color:var(--tx3)}
.fm-pad:hover{border-color:var(--cLine);background:var(--cSoft)}
.fm-pad.struck{transform:scale(.94);background:var(--c);border-color:var(--c)}
.fm-pad.struck strong,.fm-pad.struck small{color:#fff}
.seq-lbl{font-size:11px;color:var(--tx3);display:flex;align-items:center}
.seq-lbl select{width:100%;min-height:32px;font-size:11px;padding:2px 4px}
.swing-bar{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center}

/* 音阶指纹 */
.fingerprint{display:flex;align-items:flex-end;gap:4px;min-height:96px;padding:14px 0 26px}
.fingerprint span{position:relative;flex:1;min-width:30px;height:calc(26px + var(--d,1) * 22px);border-bottom:3px solid var(--c);background:var(--cSoft);display:flex;align-items:center;justify-content:center;border-radius:5px 5px 0 0}
.fingerprint span.root{background:var(--c)}
.fingerprint span i{font-style:normal;font-size:12px;font-weight:700;color:var(--tx)}
.fingerprint span small{position:absolute;left:0;bottom:-24px;font-size:10px;color:var(--tx3)}
.scale-list{display:flex;flex-wrap:wrap;gap:6px}
.scale-list button{min-height:36px;padding:6px 11px;border-radius:7px;background:var(--card2);border:1px solid var(--line);font-size:13px}
.scale-list button[aria-pressed=true]{background:var(--cSoft);border-color:var(--cLine);color:var(--c)}

/* 效果器 */
.meters{padding:12px 0 4px}
.level-row{display:grid;grid-template-columns:40px minmax(0,1fr) 74px;gap:10px;align-items:center;margin-bottom:10px;font-size:12px}
.level-row output{text-align:right;font-variant-numeric:tabular-nums;color:var(--tx3)}
.level-track{height:12px;background:var(--card2);border-radius:3px;overflow:hidden}
.level-track i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:var(--c)}
.gr-track{height:32px;background:var(--card2);border:1px solid var(--line);border-radius:4px;overflow:hidden;margin:10px 0 6px}
.gr-track i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:#FF9E80}
.gr-scale{display:flex;justify-content:space-between;font-size:11px;color:var(--tx3);margin-bottom:12px}
.viz{display:flex;align-items:flex-end;gap:3px;height:150px;background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:10px}
.viz span{flex:1;min-width:3px;background:var(--c);border-radius:2px 2px 0 0;height:6%;transition:height .08s linear}

@media(max-width:560px){
  .wrap{width:calc(100% - 32px)}
  .lab-intro{padding-block:36px 24px}
  .lab-intro p{font-size:15px}
  .tool-companions{grid-template-columns:1fr}
  .desk{padding:18px 14px}
  .notebook{grid-template-columns:1fr}
  .experiment-heading h1{font-size:26px}
  .kb-wrap{height:126px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---------- 会员锁 ---------- */
.lock-card{max-width:460px;margin:28px auto;display:grid;gap:12px;justify-items:center;text-align:center;padding:38px 30px;border:1px dashed var(--cLine);border-radius:16px;background:var(--card)}
.lock-icon{font-size:38px;line-height:1}
.lock-card h3{font-size:19px;color:var(--tx)}
.lock-card p{font-size:14px;line-height:1.9}
.lock-actions{display:flex;gap:10px;margin-top:4px}
.lock-actions .primary{height:44px;padding:0 24px;border-radius:10px}
.lock-actions button{height:44px;padding:0 20px;border-radius:10px;border:1px solid var(--line);color:var(--tx2)}
.lock-status{font-size:12px;color:var(--tx3)}

/* ---------- 扒和弦：证据小字 ---------- */
.featured-chords span i{font-style:normal;font-size:11px;color:var(--tx3)}

/* ---------- 调式 A/B：双指纹 ---------- */
.ab-fps{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.ab-fps .fingerprint{position:relative}
.ab-fps .fingerprint.on{opacity:1!important}
.ab-fps .fingerprint:not(.on){opacity:.4}
@media(max-width:640px){.ab-fps{grid-template-columns:1fr}}