:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#14161a;--fg:#eef0f3;--muted:#8b93a1;--card:#1e2128;--accent:#4f8cff;--ok:#2fbf71;--bad:#e5484d}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);font:17px/1.4 -apple-system,system-ui,sans-serif}#root{height:100dvh;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);flex-direction:column;display:flex}button{font:inherit;color:inherit;background:var(--card);cursor:pointer;text-align:left;border:0;border-radius:14px;padding:16px}button:disabled{opacity:.45}button.primary{background:var(--accent);color:#fff;text-align:center;font-weight:600}button.secondary{background:var(--card);text-align:center}button.big{padding:22px;font-size:20px}button.link{color:var(--accent);background:0 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12px;font-size:20px}.card-actions{flex-direction:column;gap:8px;padding:12px 16px 16px;display:flex}.prose code{background:var(--card);border-radius:6px;padding:1px 5px}.why{color:var(--muted);font-size:15px}.code{white-space:pre;background:#1b1d22;border-radius:12px;margin:10px 0;padding:12px;overflow-x:auto}.code.expect{color:var(--ok)}.options{flex-direction:column;flex:0 auto;gap:10px;min-height:0;padding:8px 16px 16px;display:flex;overflow-y:auto}.option{border:2px solid #0000;padding:18px 16px}.option.mono,.pline{white-space:pre;font-family:ui-monospace,Menlo,monospace;font-size:15px;overflow-x:auto}.option.right{border-color:var(--ok)}.option.wrong{border-color:var(--bad)}.option.dim{opacity:.5}.pline{text-align:left;flex:none;width:100%;padding:12px 14px;display:block}.pline.placed{background:#263247}.parsons-answer{flex-direction:column;gap:6px;min-height:120px;display:flex}.banner{padding:16px 16px calc(16px + env(safe-area-inset-bottom));background:#11301f;border-radius:18px 18px 0 0;flex-direction:column;flex:none;gap:8px;display:flex}.banner.wrong{background:#3a1517}.banner p{margin:0}.toast{left:16px;right:16px;top:calc(env(safe-area-inset-top) + 8px);background:var(--accent);color:#fff;text-align:center;z-index:10;font-weight:600;position:fixed}.library{flex-direction:column;gap:6px;padding:8px 16px 24px;display:flex;overflow-y:auto}.library h2{color:var(--muted);margin:16px 0 4px;font-size:15px}.lesson-row{justify-content:space-between;align-items:center;gap:8px;width:100%;padding:14px 16px;display:flex}.lesson-row small{color:var(--muted)}.goal{background:var(--card);border-radius:14px;align-items:center;gap:14px;padding:12px 14px;display:flex}.goal div{flex-direction:column;gap:2px;display:flex}.goal 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th,.compare td{text-align:left;vertical-align:top;border-bottom:1px solid #2c313b;padding:10px 6px;font-weight:400}.compare thead th{font-weight:600}.compare tbody th{color:var(--muted);font-size:14px}.stepper{align-items:center;gap:4px;display:inline-flex}.stepper button{padding:6px 12px;font-size:20px}.filebtn{background:var(--card);text-align:center;cursor:pointer;border-radius:14px;padding:16px;display:block}