:root{--bg: #fbf8f3;--surface: #ffffff;--surface-2: #f4efe7;--text: #24201c;--muted: #776f66;--line: #e6dfd4;--primary: #e8590c;--primary-ink: #ffffff;--primary-soft: #fff0e6;--accent: #1c7ed6;--ok: #2b8a3e;--bad: #c92a2a;--k-root: #e8590c;--k-tone: #339af0;--k-tension: #9c36b5;--k-scale: #69db7c;--k-active: #fcc419;--k-approach: #f06595;--radius: 14px;--shadow: 0 1px 2px rgba(40, 30, 20, .06), 0 6px 20px rgba(40, 30, 20, .06);font-family:Pretendard,Apple SD Gothic Neo,Malgun Gothic,system-ui,-apple-system,sans-serif;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}@media(prefers-color-scheme:dark){:root{--bg: #17151a;--surface: #211e25;--surface-2: #2a2630;--text: #efeae4;--muted: #a59d95;--line: #38333f;--primary: #ff7a35;--primary-soft: #3a2519;--accent: #4dabf7;--shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 20px rgba(0, 0, 0, .25)}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg)}body{min-height:100vh}button,select,input,textarea{font:inherit;color:inherit}a{color:inherit;text-decoration:none}.app{display:flex;flex-direction:column;min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:16px;padding:10px 20px;background:color-mix(in srgb,var(--surface) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.1rem;white-space:nowrap}.brand small{font-weight:500;color:var(--muted);font-size:.8rem;margin-left:2px}.logo{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--primary);color:#fff;font-size:1.2rem}.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}.nav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-weight:600;font-size:.95rem}.nav a:hover{background:var(--surface-2);color:var(--text)}.nav a.active{background:var(--primary-soft);color:var(--primary)}.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:6px 12px;font-size:1.1rem}@media(max-width:860px){.topbar{padding:10px 16px;flex-wrap:wrap}.menu-btn{display:block}.nav{display:none;width:100%;flex-direction:column;margin:0}.nav.open{display:flex}}.main{flex:1;width:100%;max-width:1180px;margin:0 auto;padding:24px 20px 48px}@media(max-width:600px){.main{padding:16px 16px 40px}}.footer{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:16px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem}.muted{color:var(--muted)}.hero{padding:28px 0 24px}.hero h1{font-size:clamp(1.6rem,4vw,2.5rem);margin:0 0 10px;letter-spacing:-.02em}.hero em{font-style:normal;color:var(--primary)}.hero p{color:var(--muted);margin:0;font-size:1.05rem}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:24px}.tool-card{display:flex;flex-direction:column;gap:6px;padding:22px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .15s,border-color .15s}.tool-card:hover{transform:translateY(-2px);border-color:var(--primary)}.tool-icon{font-size:2rem}.tool-card h2{margin:4px 0 0;font-size:1.25rem}.tool-card p{margin:0;color:var(--muted);line-height:1.5;flex:1}.tool-card .go{color:var(--primary);font-weight:700;margin-top:8px}.tips ul{margin:0;padding-left:20px;color:var(--muted);line-height:1.8}.page-head{display:flex;gap:14px;align-items:center;margin-bottom:18px}.page-icon{font-size:2rem;width:56px;height:56px;display:grid;place-items:center;background:var(--primary-soft);border-radius:16px;flex:none}.page-head h1{margin:0;font-size:1.6rem;letter-spacing:-.01em}.page-head p{margin:2px 0 0;color:var(--muted)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);margin-bottom:16px}.card-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}.card h3{margin:0;font-size:1.05rem}.card-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid-2>*{min-width:0}@media(max-width:860px){.grid-2{grid-template-columns:1fr}}.controls{display:flex;flex-wrap:wrap;gap:14px 18px;align-items:flex-end}.field{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:var(--muted);font-weight:600;min-width:0}.field.grow{flex:1 1 260px}select,input[type=text],textarea{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 10px;color:var(--text);font-weight:500;max-width:100%}input[type=text]{width:100%}select:focus,input:focus,textarea:focus,button:focus-visible{outline:2px solid var(--primary);outline-offset:1px}input[type=range]{accent-color:var(--primary);width:180px;max-width:100%}.check{display:inline-flex;gap:6px;align-items:center;font-size:.9rem;color:var(--text);font-weight:500;cursor:pointer}.check input{accent-color:var(--primary)}.btn{border:1px solid var(--line);background:var(--surface);padding:9px 16px;border-radius:10px;font-weight:700;cursor:pointer;white-space:nowrap}.btn:hover{border-color:var(--primary)}.btn-primary,.btn-play{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}.btn-primary:hover,.btn-play:hover{filter:brightness(1.06)}.btn-stop{background:var(--text);color:var(--bg);border-color:var(--text)}.btn-sm{padding:6px 10px;font-size:.85rem}.root-picker{display:flex;flex-wrap:wrap;gap:6px}.chip{min-width:42px;padding:7px 10px;border-radius:10px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-weight:700}.chip:hover{border-color:var(--primary)}.chip.on{background:var(--primary);color:#fff;border-color:var(--primary)}.seg{display:inline-flex;background:var(--surface-2);border-radius:10px;padding:3px;gap:2px;flex-wrap:wrap}.seg button{border:0;background:none;padding:6px 12px;border-radius:8px;cursor:pointer;font-weight:600;color:var(--muted)}.seg button.on{background:var(--surface);color:var(--text);box-shadow:0 1px 3px #0000001f}.type-grid{display:flex;flex-wrap:wrap;gap:6px}.type-grid .chip{font-weight:600;font-size:.9rem}.group-label{font-size:.8rem;color:var(--muted);font-weight:700;margin:10px 0 6px}.big-name{font-size:clamp(2rem,6vw,3rem);font-weight:800;letter-spacing:-.02em;line-height:1.1}.big-sub{color:var(--muted);margin-top:4px}.tone-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.tone{display:flex;flex-direction:column;align-items:center;min-width:58px;padding:8px 10px;border-radius:12px;background:var(--surface-2);border:2px solid transparent}.tone b{font-size:1.2rem}.tone small{color:var(--muted);font-size:.75rem}.tone.root{border-color:var(--k-root)}.tone.tone-c{border-color:var(--k-tone)}.tone.tension{border-color:var(--k-tension)}.steps{display:flex;flex-wrap:wrap;gap:4px;margin-top:10px;align-items:center}.steps span{font-size:.8rem;font-weight:700;padding:2px 8px;border-radius:6px;background:var(--surface-2)}.steps span.H{background:var(--primary-soft);color:var(--primary)}.piano-wrap{overflow-x:auto;padding-bottom:4px}.piano{width:100%;min-width:560px;height:auto;display:block;-webkit-user-select:none;user-select:none;touch-action:manipulation}.pkey{cursor:pointer}.piano .white{fill:#fff;stroke:#bdb5aa;stroke-width:1}.piano .black{fill:#2b2724;stroke:#111;stroke-width:1}.piano .white:hover{fill:#f5f1ec}.piano .hl-root{fill:var(--k-root)!important}.piano .hl-tone{fill:var(--k-tone)!important}.piano .hl-tension{fill:var(--k-tension)!important}.piano .hl-scale{fill:var(--k-scale)!important}.piano .hl-active{fill:var(--k-active)!important}.piano .hl-approach{fill:var(--k-approach)!important}.piano .klabel{font-size:9px;font-weight:700;fill:#555;pointer-events:none}.piano .klabel.on{fill:#fff}.piano .hl-active~.klabel.on,.piano .hl-scale~.klabel.on{fill:#222}.piano .black-label{fill:#ddd;font-size:8px}.piano .cmark{font-size:8px;fill:#9a9188;pointer-events:none}.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:.8rem;color:var(--muted);margin-top:8px}.legend span{display:inline-flex;gap:6px;align-items:center}.sw{width:12px;height:12px;border-radius:3px;display:inline-block}.sw.k-root{background:var(--k-root)}.sw.k-tone{background:var(--k-tone)}.sw.k-tension{background:var(--k-tension)}.sw.k-scale{background:var(--k-scale)}.sw.k-active{background:var(--k-active)}.sw.k-approach{background:var(--k-approach)}.paper{background:#fffdf8;border-radius:10px;border:1px solid #e9e2d6;padding:6px 0;overflow:hidden;color:#000;min-height:60px}.staff svg{display:block}.chord-strip{display:flex;flex-wrap:wrap;gap:6px}.chord-chip{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:var(--surface);cursor:pointer;text-align:left;min-width:0;position:relative}.chord-chip .sym{font-weight:800;font-size:1.1rem}.chord-chip .roman{font-size:.8rem;color:var(--muted);font-weight:600}.chord-chip .tech{font-size:.72rem;color:var(--k-tension);font-weight:700}.chord-chip.changed{border-color:var(--k-tension);background:color-mix(in srgb,var(--k-tension) 7%,var(--surface))}.chord-chip.active{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 2px var(--primary)}.table-wrap{overflow-x:auto}table.diatonic{border-collapse:collapse;width:100%;font-size:.95rem}table.diatonic th,table.diatonic td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:center}table.diatonic th{color:var(--muted);font-size:.8rem}table.diatonic button{background:none;border:1px solid var(--line);border-radius:8px;padding:4px 8px;cursor:pointer;font-weight:700}table.diatonic button:hover{border-color:var(--primary);color:var(--primary)}.explain{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.explain li{display:flex;flex-wrap:wrap;gap:10px;align-items:baseline;padding:10px 12px;border-radius:10px;background:var(--surface-2)}.explain .badge{font-size:.75rem;font-weight:800;padding:2px 8px;border-radius:999px;background:var(--k-tension);color:#fff}.explain b{white-space:nowrap}.info{font-size:.9rem;color:var(--muted);line-height:1.6}.info b{color:var(--text)}.quiz-opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;margin-top:12px}.quiz-opts button{padding:12px;border-radius:12px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-weight:700}.quiz-opts button.right{background:var(--ok);color:#fff;border-color:var(--ok)}.quiz-opts button.wrong{background:var(--bad);color:#fff;border-color:var(--bad)}.score{font-weight:800;color:var(--primary)}.seq{display:grid;grid-template-columns:90px repeat(16,minmax(18px,1fr));gap:3px;align-items:center;min-width:520px}.seq-wrap{overflow-x:auto}.seq .lab{font-size:.8rem;font-weight:700;color:var(--muted)}.seq button{height:28px;border-radius:5px;border:1px solid var(--line);background:var(--surface-2);cursor:pointer;padding:0}.seq button.beat{background:color-mix(in srgb,var(--surface-2) 70%,var(--line))}.seq button.on{background:var(--primary);border-color:var(--primary)}.seq button.acc{background:#c2410c;border-color:#c2410c}.seq button.now{outline:2px solid var(--k-active)}.counts{display:flex;flex-wrap:wrap;gap:4px;margin-top:10px;font-family:ui-monospace,monospace}.counts span{padding:4px 6px;border-radius:6px;background:var(--surface-2);font-size:.85rem}.counts span.rest{opacity:.4}.counts span.now{background:var(--k-active);color:#222}.note-badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.note-badges span{font-size:.8rem;padding:2px 8px;border-radius:999px;background:var(--surface-2)}