:root{--void: #131217;--panel: #1c1a22;--panel-2: #25222c;--rule: #332f3d;--wood: #4a3025;--wood-dark: #3a241b;--nickel: #b9bcc4;--bone: #e4dbc6;--cream: #ede7dc;--amber: #e8a33d;--verdigris: #5fa8a0;--text: #e7e4ec;--dim: #918b9e;--dimmer: #635e70;--display: "Bricolage Grotesque", -apple-system, sans-serif;--body: "Noto Sans TC", "Bricolage Grotesque", sans-serif;--mono: "IBM Plex Mono", ui-monospace, monospace}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--void);color:var(--text);font-family:var(--body);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}.wrap{max-width:1000px;margin:0 auto;padding:32px 20px 72px}.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--dimmer);margin:0 0 10px}h1{font-family:var(--display);font-weight:800;font-size:clamp(30px,6vw,46px);line-height:1.05;letter-spacing:-.02em;margin:0}h1 .thin{font-weight:400;color:var(--dim)}.lede{color:var(--dim);margin:12px 0 0;max-width:58ch;font-size:14px}a{color:var(--amber)}.readout{margin:28px 0 20px;padding:18px 20px;background:var(--panel);border:1px solid var(--rule);border-left:3px solid var(--amber);border-radius:0 8px 8px 0;display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 18px}.readout .key{font-family:var(--display);font-weight:800;font-size:26px;letter-spacing:-.01em;color:var(--amber)}.readout .desc{font-size:14px;color:var(--dim)}.readout .desc b{color:var(--text);font-weight:500}.rack{background:var(--panel);border:1px solid var(--rule);border-radius:10px;padding:6px 20px 18px;margin-bottom:24px}.row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;padding:14px 0;border-bottom:1px solid var(--rule)}.row:last-child{border-bottom:none;padding-bottom:4px}.row .lbl{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dimmer);width:78px;flex:none}@media(max-width:560px){.row .lbl{width:100%}}.hint{font-size:12.5px;color:var(--dimmer)}.seg{display:inline-flex;background:var(--panel-2);border:1px solid var(--rule);border-radius:7px;padding:3px;gap:3px;flex-wrap:wrap}.seg button{font-family:var(--body);font-size:13px;font-weight:500;color:var(--dim);background:transparent;border:0;border-radius:5px;padding:6px 13px;cursor:pointer;transition:background .14s,color .14s}.seg button:hover:not(:disabled){color:var(--text);background:#2e2a38}.seg button[aria-pressed=true]{background:var(--cream);color:#1a1720;font-weight:700}.seg button:disabled{opacity:.28;cursor:not-allowed}.shape-btn{font-family:var(--display);font-weight:600;min-width:52px}.fret-btn{font-family:var(--mono);font-weight:600;min-width:54px}.fret-btn[aria-pressed=true]{background:var(--amber);color:#1a1207}.fret-btn small{font-family:var(--body);font-weight:400;font-size:10.5px;opacity:.7;margin-left:2px}select{font-family:var(--mono);font-size:13px;font-weight:500;background:var(--panel-2);color:var(--text);border:1px solid var(--rule);border-radius:6px;padding:7px 10px;cursor:pointer}label.check{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--dim);cursor:pointer}label.check input{accent-color:var(--amber);width:15px;height:15px;cursor:pointer}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible,.board-frame:focus-visible{outline:2px solid var(--amber);outline-offset:2px}.board-frame:focus{outline:none}.board-frame{background:var(--panel);border:1px solid var(--rule);border-radius:10px;padding:14px 0 8px;overflow-x:auto;overflow-y:hidden}.board-frame::-webkit-scrollbar{height:8px}.board-frame::-webkit-scrollbar-thumb{background:var(--rule);border-radius:4px}svg{display:block;min-width:900px;width:100%;height:auto}.dot{cursor:pointer}.dot:hover circle:first-child{stroke:var(--amber);stroke-width:2}.tools{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;margin-top:16px}.play{font-family:var(--body);font-size:13px;font-weight:500;background:var(--amber);color:#1a1207;border:0;border-radius:6px;padding:9px 18px;cursor:pointer}.play:hover{filter:brightness(1.08)}.legend{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:20px;font-size:12.5px;color:var(--dim)}.legend i{display:inline-block;width:13px;height:13px;border-radius:50%;margin-right:7px;vertical-align:-2px}.k-do{background:var(--amber)}.k-note{background:var(--cream)}.k-out{background:transparent;border:1.5px solid var(--verdigris)}.k-ghost{background:#5a5368}.note-block{margin-top:34px;padding-top:22px;border-top:1px solid var(--rule);font-size:13.5px;color:var(--dim)}.note-block h2{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--dimmer);font-weight:500;margin:0 0 12px}.note-block p{margin:0 0 10px;max-width:70ch}.note-block b{color:var(--text);font-weight:500}.site-nav{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 18px;margin-bottom:20px}.site-nav .brand{font-family:var(--display);font-weight:800;font-size:16px;color:var(--text);text-decoration:none}.lang-switch{display:inline-flex;gap:8px;font-family:var(--mono);font-size:12px}.lang-switch a{color:var(--dim);text-decoration:none;padding:4px 8px;border-radius:5px;border:1px solid transparent}.lang-switch a[aria-current=true]{color:var(--amber);border-color:var(--rule);background:var(--panel-2)}.lesson-list{display:grid;gap:14px;margin-top:24px;padding:0;list-style:none}.lesson-card{display:block;background:var(--panel);border:1px solid var(--rule);border-radius:10px;padding:18px 20px;text-decoration:none;color:inherit;transition:border-color .14s}.lesson-card:hover{border-color:var(--amber)}.lesson-card .lesson-eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--amber)}.lesson-card h2{font-family:var(--display);font-weight:700;font-size:19px;margin:6px 0 4px;color:var(--text)}.lesson-card p{margin:0;color:var(--dim);font-size:13.5px}@media(prefers-reduced-motion:reduce){*{transition:none!important}}