:root{color:#211b15;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--ink:#211b15;--muted:#75695f;--line:#d8c8b6;--paper:#fffaf2;--panel:#f8efe5;--accent:#0f766e;--accent-dark:#115e59;--accent-soft:#d2ece7;--danger:#9f2d22;background:#ede4d8;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,input{font:inherit}button{color:inherit}.app-shell{background:linear-gradient(135deg,#0f766e21,#0000 38%),linear-gradient(315deg,#6c54391f,#0000 42%),#ede4d8;min-height:100vh;padding:20px}.workspace{grid-template-columns:320px minmax(0,1fr);gap:18px;max-width:1420px;margin:0 auto;display:grid}.lesson-panel,.studio{border:1px solid var(--line);background:#fffaf2eb;box-shadow:0 18px 60px #3c2d201c}.lesson-panel{border-radius:8px;align-self:start;min-height:calc(100vh - 40px);padding:24px;position:sticky;top:20px}.studio{border-radius:8px;min-height:calc(100vh - 40px);padding:24px}.brand-row,.topbar,.transport,.eq-header,.source-pill,.practice-strip,.volume-control{align-items:center;display:flex}.brand-row{gap:14px;margin-bottom:34px}.brand-mark{color:#fff;background:var(--accent);border-radius:8px;place-items:center;width:52px;height:52px;display:grid}.eyebrow{color:var(--accent-dark);letter-spacing:.08em;text-transform:uppercase;margin:0 0 6px;font-size:.73rem;font-weight:800}h1,h2{margin:0;line-height:1.05}h1{font-size:clamp(2rem,5vw,3.7rem)}h2{font-size:1.35rem}p{color:var(--muted);line-height:1.6}.lesson-block{border-bottom:1px solid var(--line);padding-bottom:22px}.band-card{border:1px solid var(--line);background:var(--panel);border-radius:8px;margin:22px 0;padding:18px}.band-card-icon{width:42px;height:42px;color:var(--accent-dark);background:var(--accent-soft);border-radius:8px;place-items:center;margin-bottom:15px;display:grid}.band-card strong{color:var(--accent-dark);margin-top:12px;font-size:1.8rem;display:inline-block}.frequency-guide{gap:8px;display:grid}.frequency-guide h2{margin-bottom:6px}.guide-row{cursor:pointer;text-align:left;background:0 0;border:1px solid #0000;border-radius:8px;justify-content:space-between;width:100%;padding:12px;display:flex}.guide-row:hover,.guide-row.active{background:var(--accent-soft);border-color:#add9d4}.topbar{justify-content:space-between;gap:20px;margin-bottom:20px}.topbar h2{word-break:break-word;margin-bottom:10px;font-size:clamp(1.4rem,3vw,2.4rem)}.source-pill{width:fit-content;color:var(--accent-dark);background:var(--accent-soft);border-radius:999px;gap:7px;padding:7px 10px;font-size:.85rem;font-weight:800}.transport{flex-wrap:wrap;justify-content:flex-end;gap:10px}.icon-button{border:1px solid var(--line);cursor:pointer;background:#fffaf2;border-radius:8px;align-items:center;gap:8px;min-height:44px;padding:10px 14px;font-weight:800;display:inline-flex}.icon-button:hover{background:#edf8f6;border-color:#92cac3}.icon-button.primary{color:#fff;border-color:var(--accent);background:var(--accent)}.icon-button.primary:hover{background:var(--accent-dark)}.visualizer-wrap{border:1px solid var(--line);background:#f7f3ec;border-radius:8px;overflow:hidden}canvas{width:100%;height:clamp(150px,22vw,240px);display:block}.preset-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:18px 0;display:grid}.preset{border:1px solid var(--line);cursor:pointer;text-align:left;background:#fffaf2;border-radius:8px;min-height:112px;padding:16px}.preset strong,.preset span{display:block}.preset strong{margin-bottom:8px;font-size:1rem}.preset span{color:var(--muted);line-height:1.45}.preset:hover,.preset.active{background:#edf8f6;border-color:#7bbeb6}.eq-board{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:20px}.eq-header{justify-content:space-between;gap:18px;margin-bottom:20px}.volume-control{min-width:210px;color:var(--accent-dark);gap:10px}.volume-control input{width:100%;accent-color:var(--accent)}.sliders{grid-template-columns:repeat(6,minmax(92px,1fr));gap:12px;display:grid}.eq-strip{border:1px solid var(--line);background:#fffaf2;border-radius:8px;justify-items:center;gap:11px;min-height:280px;padding:16px 10px;display:grid}.eq-strip.selected{background:#edf8f6;border-color:#7bbeb6}.eq-strip input[type=range]{width:170px;accent-color:var(--accent);transform-origin:50%;margin:68px 0;transform:rotate(-90deg)}.gain-value{min-width:62px;color:var(--accent-dark);background:var(--accent-soft);text-align:center;border-radius:999px;padding:5px 8px;font-size:.82rem;font-weight:800}.eq-strip strong{margin-top:4px}.eq-strip>span:last-child{color:var(--muted);text-align:center;font-size:.86rem}.practice-strip{color:var(--accent-dark);background:var(--accent-soft);border-radius:8px;gap:12px;margin-top:18px;padding:14px 16px}.practice-strip p{color:#25433e;margin:0}.error-banner{color:var(--danger);background:#fff0ed;border:1px solid #d89b91;border-radius:8px;margin-bottom:14px;padding:12px 14px;font-weight:700}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}@media (width<=1050px){.workspace{grid-template-columns:1fr}.lesson-panel{min-height:auto;position:static}.preset-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sliders{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (width<=700px){.app-shell{padding:10px}.lesson-panel,.studio{padding:16px}.topbar,.eq-header{flex-direction:column;align-items:stretch}.transport{justify-content:flex-start}.preset-grid,.sliders{grid-template-columns:1fr}.eq-strip{grid-template-rows:auto auto;grid-template-columns:74px 1fr 62px;place-items:center stretch;min-height:122px}.eq-strip input[type=range]{width:100%;margin:0;transform:none}.eq-strip strong{text-align:right}.eq-strip>span:last-child{text-align:left;grid-column:2/4}}