/* Website presentation layer; music behavior lives in src/. */
:root{--paper:#f0efeb;--ink:#262724;--muted:#757670;--line:#d6d5ce;--accent:#d94b29;--soft:#e9e7df;background:var(--paper);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif}body{background:var(--paper)}a{color:inherit}.site-return{max-width:1340px;padding:22px 48px 0;margin:auto;display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted)}.site-return a{text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:4px}.site-return span{font:9px monospace;letter-spacing:1px}header{max-width:1340px;height:95px;padding:0 48px}.brand-icon{border-radius:0;background:transparent;color:var(--ink);font-size:32px;width:36px}.brand{font-weight:500;letter-spacing:0}.brand small{color:var(--muted)}main{max-width:1340px;padding:0 48px}.toolkit-intro{padding:18px 0 35px}.toolkit-intro>span{font:10px monospace;letter-spacing:2px;color:var(--muted)}.toolkit-intro h1{font-size:clamp(32px,5vw,64px);font-weight:500;letter-spacing:-2px;margin:25px 0 12px}.toolkit-intro p{font-size:13px;color:var(--muted)}.section-label{font-size:10px}.section-label>span{font:10px monospace;color:var(--muted)}.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.tool-card{border-radius:0;background:#faf9f5;box-shadow:none;border:0;padding:30px;min-height:275px;overflow:hidden}.tool-card:nth-child(2){background:#dfe5d5}.tool-card:nth-child(3){background:#e9dfd1}.tool-card:hover{transform:translateY(-5px);box-shadow:0 12px 20px #26272408}.tool-icon{width:105px;height:105px;border-radius:50%;background:var(--accent);color:#faf9f5;font-size:36px;letter-spacing:-2px;font-weight:500}.tool-card:nth-child(2) .tool-icon{background:#354f39}.tool-card:nth-child(3) .tool-icon{background:#262724}.tool-card h3{font-weight:500;font-size:20px;margin:24px 0}.tool-card .enter{font-size:11px;color:var(--muted)}h1{font-weight:500}.chord-card,.controls,.practice-card,.answer-panel,.guitar-panel,.guitar-board-card,.guitar-controls{border-radius:3px;box-shadow:none;background:#faf9f5;border-color:var(--line)}.primary{border-radius:3px;background:var(--accent)}.secondary{border-radius:3px;background:#faf9f5;border-color:var(--line);color:var(--ink)}select,input[type=number],input[type=text]{border-radius:3px!important;border-color:var(--line)!important;background:#fffefa!important;color:var(--ink)}.choice{border-radius:3px;border-color:var(--line);background:#faf9f5}.choice:has(input:checked){background:#e4e8dd;border-color:#98a58b}.mode-presets{background:#e5e3db;border-radius:3px}.mode-presets button{border-radius:2px;color:var(--ink)}.mode-presets button[aria-pressed=true]{background:#354f39}.global-display{background:#e9e7df;border-color:var(--line);border-radius:3px}.tone-lab{border-color:var(--line);border-radius:3px;background:#faf9f5}.back{color:var(--muted)}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
@media(max-width:850px){.tool-grid{grid-template-columns:1fr}.tool-card{min-height:185px;padding:25px}.tool-icon{float:right;width:90px;height:90px;margin-left:12px}.site-return,header,main{padding-left:6vw;padding-right:6vw}.site-return span{display:none}.toolkit-intro{padding-top:0}.toolkit-intro h1{letter-spacing:-1px}.offline{font-size:10px}}
/* Optional per-tool artwork, supplied by the owner in Django admin. */
.tool-card.has-cover{padding-top:24px}.tool-cover{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;margin-bottom:20px}.tool-card.has-cover .tool-icon{display:none}.tool-card.has-cover h3{margin-top:8px}.string-mute-hint{font-size:12px;line-height:1.8;color:var(--muted);margin:14px 0}.guitar-svg{user-select:none;-webkit-user-select:none}
@media(max-width:850px){.tool-card.has-cover .tool-cover{width:100%;float:none;max-height:280px;aspect-ratio:16/9}.tool-card.has-cover{min-height:0}}

/* v0.4 musical chips; row stays horizontal, smaller screens can scroll it. */
#guitar-tool .guitar-selectors{display:flex;flex-direction:column;gap:20px}
#guitar-tool .guitar-selectors>div:last-child{max-width:330px}
.music-choice-row{display:flex;gap:14px;overflow-x:auto;padding:10px 8px 14px;align-items:center;min-width:0;scrollbar-width:thin}
#guitar-tool .music-choice{flex:0 0 auto;position:relative;isolation:isolate;width:54px;height:54px;border:1.5px solid #171717;border-radius:50%;background:hsl(var(--hue),70%,94%);color:#171717;font-size:12px;font-weight:650;padding:2px;cursor:pointer;transition:background .15s,color .15s}
#guitar-tool .music-choice.is-chosen{background:hsl(var(--hue),58%,31%);color:white;border-color:transparent}
#guitar-tool .music-choice.is-chosen::before{content:"";position:absolute;inset:-3px;border:3px solid #171717;border-radius:37%;animation:choice-orbit 9s linear infinite;pointer-events:none}
#guitar-tool .single-selected .music-choice:not(.is-chosen){background:#efefed;color:#888;border-color:#aaa}
#guitar-tool .single-selected .music-choice:not(.is-chosen):hover{background:hsl(var(--hue),70%,94%);color:#171717;border-color:#171717}
#guitar-tool .music-choice:focus-visible{outline:2px solid var(--accent);outline-offset:7px}
.guitar-more{margin-top:6px}.guitar-more summary{font-size:12px;cursor:pointer;padding:9px 0}
#guitar-tool .guitar-svg{width:120%;min-width:1176px;height:auto}
#guitar-board{cursor:grab;touch-action:pan-y;user-select:none;-webkit-user-select:none}
#guitar-board:active{cursor:grabbing}#guitar-board [data-window-drag]{touch-action:none}
@keyframes choice-orbit{to{transform:rotate(360deg)}}
@media(max-width:700px){#guitar-tool .guitar-svg{min-width:1320px}.music-choice-row{gap:12px}#guitar-tool .music-choice{width:48px;height:48px;font-size:11px}}
@media(prefers-reduced-motion:reduce){#guitar-tool .music-choice.is-chosen::before{animation:none;transform:rotate(12deg)}}

#guitar-root-choices{gap:11px}#guitar-tool #guitar-root-choices .music-choice{width:48px;height:48px}

/* v0.5 compact guitar controls */
#guitar-tool>.tool-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px}
.compact-tuning{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:10px;white-space:nowrap}
#guitar-tuning{width:140px;font-size:10px;padding:5px}
#guitar-tool .guitar-settings{padding:10px 14px;border-radius:8px}
#guitar-tool .guitar-selectors{gap:6px}#guitar-tool .guitar-selectors>div:last-child{max-width:none}
#guitar-tool .guitar-selectors label{font-size:10px;margin:0 0 3px}
#guitar-tool .music-choice-row,#guitar-root-choices{gap:5px;padding:3px 2px 5px}
#guitar-tool .music-choice,#guitar-tool #guitar-root-choices .music-choice{width:auto;min-width:35px;height:29px;border-radius:5px;padding:3px 7px;font-size:11px;font-weight:500}
#guitar-tool .single-selected .music-choice:not(.is-chosen){background:hsl(var(--hue),65%,94%);color:#222;border-color:#555}
#guitar-tool .music-choice:not(.is-chosen):hover{background:hsl(var(--hue),65%,86%);color:#111;border-color:#111}
#guitar-tool .music-choice.is-chosen{border:2px solid #171717;font-weight:700}
#guitar-tool .music-choice.is-chosen::before{content:none;animation:none}
#guitar-tool .guitar-more{margin-top:0}#guitar-tool .guitar-more summary{padding:3px 0;font-size:10px}
#guitar-tool .guitar-extension-row{margin-top:5px;padding-top:6px}#guitar-tool .guitar-extension-heading{margin-bottom:2px}
#guitar-tool .guitar-extension-heading h2{font-size:10px}#guitar-tool .guitar-hint{margin-top:4px;font-size:10px}
#guitar-tool .guitar-result{margin-top:10px}.answer-input-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;text-align:left;font-size:12px}
.answer-input-bar select{max-width:220px;font-size:11px;padding:6px}
.piano-key.user-selected{box-shadow:inset 0 -9px #267986;background:#cae9df}.piano-key.black.user-selected{background:#246779;color:white}
.practice-report{padding:18px 24px;border:1px solid var(--line);background:#faf9f5;margin-bottom:40px}
.report-heading,.report-actions{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}.report-heading h2{font-size:17px;font-weight:500}.report-actions{justify-content:flex-start}.report-actions label{font-size:12px}.report-actions input{width:150px;padding:8px}.report-actions button{font-size:12px;padding:9px 12px}
#practice-session-summary{font-size:13px;line-height:1.9}#practice-history{max-height:260px;overflow:auto;font-size:12px;line-height:2}#practice-share-image{display:block;max-width:440px;width:100%;height:auto;margin:20px auto 10px}
@media(max-width:700px){#guitar-tool>.tool-heading h1{font-size:21px}#guitar-tuning{width:104px}.compact-tuning{font-size:9px}#guitar-tool .music-choice,#guitar-tool #guitar-root-choices .music-choice{min-width:31px;height:28px;font-size:10px;padding:3px 5px}.practice-report{padding:16px 12px}}

/* v0.6 timing, live MIDI and compact fretboard parameters */
.practice-timer{margin:18px 0 12px}#practice-progress{height:10px;border-radius:7px;overflow:hidden;background:#dddcd5}#practice-progress-fill{height:100%;width:100%;background:#d94b29;transform:scaleX(0);transform-origin:left;transition:transform .15s linear}
#practice-tool .practice-timer .countdown{font-size:24px;font-weight:650;font-variant-numeric:tabular-nums;text-align:center;margin:12px 0;min-height:32px;color:#262724}
.piano-key.midi-held,.piano-key.black.midi-held{background:#74c5b4!important;box-shadow:inset 0 -8px #175b59;color:#173b39}
.answer-panel .piano-key.black .enharmonic-label{display:flex;flex-direction:column;gap:3px;writing-mode:horizontal-tb;font-size:10px;line-height:1.15}
.guitar-top-actions{display:flex;align-items:center;gap:9px;margin:12px 0 8px}.guitar-top-actions .secondary{font-size:12px;padding:8px 12px}.guitar-top-actions>label{margin-left:auto;font-size:11px}
#guitar-tool .guitar-view-controls{display:flex;flex-wrap:nowrap;gap:16px;overflow-x:auto;margin:8px 0;padding-bottom:6px;font-size:11px}
#guitar-tool .guitar-view-controls label{flex:1 0 auto;white-space:nowrap;gap:5px}#guitar-tool .guitar-view-controls input[type=range]{width:clamp(70px,8vw,120px)}
.rule-help{position:relative;display:inline-flex}.rule-help-button{border:1px solid #999!important;border-radius:50%;color:#888;background:transparent;width:19px;height:19px;line-height:17px;font-size:12px;padding:0}
#guitar-rules{display:none;position:absolute;z-index:20;left:0;top:calc(100% + 8px);width:min(330px,65vw);padding:12px 14px;background:#262724;color:#f8f7f2;border-radius:6px;font-size:12px;line-height:1.8;box-shadow:0 8px 22px #0002}
.rule-help:hover #guitar-rules,.rule-help:focus-within #guitar-rules{display:block}
@media(max-width:700px){#practice-tool .practice-timer .countdown{font-size:20px}.answer-panel .piano-key.black .enharmonic-label{font-size:8px}#guitar-tool .guitar-view-controls{gap:14px}.rule-help #guitar-rules{left:-140px}}

/* v0.7: compact tuning controls, answer feedback and string-level editing. */
.guitar-top-actions{gap:8px;flex-wrap:wrap}.guitar-top-actions select{width:auto;max-width:245px;padding:4px 8px;font-size:12px;min-height:30px}.guitar-top-actions select:disabled{color:#9b9b96;background:#eeede8;border-color:#deddd7;opacity:1}.guitar-top-actions label{white-space:nowrap}.guitar-top-actions #guitar-tuning-actions{display:inline-flex;gap:5px}.guitar-top-actions #guitar-tuning-actions[hidden]{display:none}
.string-tuning{display:flex;align-items:center;gap:1px;height:30px;font-family:Arial,sans-serif}.string-tuning button{padding:0;width:20px;min-width:20px;height:28px;border:1px solid #ccc9c0;border-radius:3px;background:#faf9f5;color:#555;font-size:15px;line-height:26px}.string-tuning input{box-sizing:border-box;width:43px;min-width:0;height:28px;padding:2px;text-align:center;font:14px Arial,sans-serif;border:1px solid #bdbab0;border-radius:3px;background:white;color:#333}.string-tuning :focus-visible{outline:2px solid #d57527;outline-offset:1px}
#countdown.feedback-blue{color:#2865b4}#countdown.feedback-green{color:#23844c}#countdown.feedback-purple{color:#8245b2}#countdown.feedback-wrong{color:#8c3434}#countdown.feedback-rainbow{color:#a449a0;background:linear-gradient(90deg,#d33d48,#b96822,#7b801c,#218653,#287bb3,#7645b7);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.answer-verdict{font-size:17px;line-height:1.6;margin:12px 0;font-weight:600}.answer-verdict.is-correct{color:#23844c}.answer-verdict.is-wrong{color:#8c3434}.report-actions #practice-person-random{font-size:23px;padding:3px 8px;min-width:34px}.guitar-view-controls output{font-variant-numeric:tabular-nums;min-width:62px}
@media(max-width:600px){.guitar-top-actions select{max-width:210px}.answer-verdict{font-size:15px}}

.key-context{font-size:clamp(18px,2.4vw,28px);font-weight:400;color:#6f7168;white-space:nowrap;margin-left:12px;letter-spacing:0}.key-context[hidden],.key-label[hidden]{display:none!important}.keyboard-degree-option{display:flex;align-items:center;gap:7px;font-size:13px;margin:10px 0 16px}.keyboard-degree-option input{width:auto}#practice-key-context{display:block;margin:0;text-align:center}#random-degree-style{margin-top:6px}

.answer-panel .piano-key .enharmonic-label{display:flex;flex-direction:column;gap:3px;writing-mode:horizontal-tb;font-size:10px;line-height:1.15}.answer-panel .piano-key .enharmonic-label>span{display:block}@media(max-width:600px){.answer-panel .piano-key .enharmonic-label{font-size:8px;gap:2px}}