:root{--studio-ink:#202747;--studio-muted:#747b92;--studio-brand:#6256d9;--studio-border:#e7e8f0;--bs-primary:#6256d9;--bs-primary-rgb:98,86,217}body{background:#f6f7fb;color:var(--studio-ink);font-family:Lexend,Noto Sans TC,sans-serif}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--studio-brand)}:focus-visible{outline:3px solid #a89ff2;outline-offset:3px}.studio-header{position:sticky;top:0;z-index:1030;background:#ffffffed;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--studio-border)}.studio-nav{max-width:1280px;margin:auto;min-height:84px;display:flex;align-items:center;gap:36px;padding:12px 32px}.studio-brand{display:flex;align-items:center;gap:11px;color:var(--studio-ink);text-decoration:none;font-size:24px;font-weight:800;letter-spacing:-1px}.studio-brand 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var(--studio-border);border-radius:12px;background:#fff;padding:12px;color:var(--studio-ink)}.mode-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-bottom:24px}.mode-grid button{border:1px solid var(--studio-border);background:#fff;border-radius:15px;padding:17px 12px;text-align:left;color:var(--studio-muted)}.mode-grid button.active{border-color:#b1a8ee;background:#eeecfc;color:var(--studio-brand)}.mode-grid i{display:block;font-size:20px;margin-bottom:10px}.mode-grid strong{display:block;font-size:12px}.mode-grid small{display:block;font-size:9px;margin-top:6px}.workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:24px;align-items:start}.learning-panel{background:#fff;border:1px solid var(--studio-border);border-radius:22px;overflow:hidden}.learning-sidebar{display:grid;gap:18px}.student-panel,.recent-panel{padding:24px}.learning-sidebar h3{font-size:16px;font-weight:700;margin:10px 0}.learning-sidebar p,.learning-sidebar 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