.calculus-hero{position:relative;overflow:hidden}.calculus-hero:after{content:'∫';position:absolute;right:2vw;top:-42px;font-family:Georgia,'Times New Roman',serif;font-size:clamp(11rem,29vw,28rem);line-height:1;color:rgba(138,79,54,.07);pointer-events:none}.calculus-hero>*{position:relative;z-index:1}.thesis-strip{display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin:28px 0 6px;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-family:var(--serif);font-size:clamp(1.15rem,2.4vw,1.8rem)}.thesis-strip b{font-family:var(--sans);font-weight:300;color:var(--accent)}.path-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}.path-step{background:var(--paper);padding:30px;min-height:230px}.path-step .step-no{font-size:.68rem;text-transform:uppercase;letter-spacing:.13em;color:var(--accent)}.path-step h3{font-family:var(--serif);font-size:1.75rem;font-weight:500;margin:9px 0 8px}.path-step .question{font-family:var(--serif);font-size:1.07rem;margin:0 0 14px;color:#393630}.path-step p:last-child{margin:0;color:var(--muted);font-size:.9rem}.formula-line{display:inline-block;margin-top:13px;padding:7px 9px;border:1px solid var(--line);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;background:rgba(255,255,255,.18)}.calculus-matrix td.answer{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.72rem;white-space:normal}.function-formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:1.05rem;color:var(--accent);margin:8px 0 11px}.card.clickable{cursor:pointer;transition:background .15s}.card.clickable:hover{background:var(--soft)}.lens-number{font-family:var(--serif);font-size:2rem;color:var(--accent);line-height:1}.playground-card{border:1px solid var(--line);background:rgba(255,255,255,.16)}.play-controls{display:grid;grid-template-columns:1.4fr .8fr auto;gap:1px;background:var(--line);border-bottom:1px solid var(--line)}.play-controls label{display:flex;flex-direction:column;gap:7px;background:var(--paper);padding:18px;font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}.play-controls select,.play-controls input{width:100%;border:0;border-bottom:1px solid var(--ink);background:transparent;padding:8px 0;font:inherit;font-size:1rem;color:var(--ink);outline:none}.play-controls button{border:0;background:var(--ink);color:var(--paper);padding:0 26px;font:inherit;font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;cursor:pointer}.play-output{padding:28px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line)}.play-result{background:var(--paper);padding:23px;min-height:150px}.play-result .label{font-size:.68rem;text-transform:uppercase;letter-spacing:.11em;color:var(--muted)}.play-result strong{display:block;font-family:var(--serif);font-size:2rem;font-weight:500;margin:8px 0}.play-result p{margin:0;color:var(--muted);font-size:.84rem}.play-note{grid-column:1/-1;background:var(--paper);padding:18px 23px;color:var(--muted);font-size:.84rem}.drawer-formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);font-size:1rem;margin:8px 0 20px}.drawer-kicker{font-size:.68rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);margin-top:34px}.drawer-panel .compact{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88rem;padding:10px 12px;border-left:2px solid var(--accent);background:rgba(255,255,255,.2)}@media(max-width:780px){.path-grid{grid-template-columns:1fr}.play-controls{grid-template-columns:1fr}.play-controls button{padding:17px}.play-output{grid-template-columns:1fr}.calculus-hero:after{right:-18vw;top:20px}}