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.case-brief{margin:0 0 70px;padding:52px;background:var(--ink);color:#fff;border-top:6px solid var(--acid);box-shadow:14px 14px 0 #cbd4ca}.case-brief>p:first-child{font:10px var(--mono);letter-spacing:.13em;color:var(--acid)}.case-brief h2{font-size:clamp(36px,4.5vw,58px);letter-spacing:-.045em;line-height:1.08;margin:22px 0}.case-brief>p{max-width:820px;color:#c5d0cc;line-height:1.85}.case-brief strong{color:#fff}.case-ledger{display:grid;grid-template-columns:repeat(5,1fr);margin:34px 0 24px;border:1px solid #ffffff2b}.case-ledger span{padding:17px;border-right:1px solid #ffffff2b}.case-ledger span:last-child{border:0}.case-ledger small{display:block;color:#8fa19a;font:8px var(--mono);margin-bottom:8px}.case-ledger b{font:20px var(--mono);color:var(--acid)}.case-rule{border-left:3px solid var(--acid);padding-left:16px;font-size:13px}.phase-marker{display:grid;grid-template-columns:110px 1fr 80px;gap:24px;align-items:end;margin:90px 0 34px;padding:0 0 22px;border-bottom:2px solid var(--ink)}.phase-marker>span{font:10px var(--mono);color:var(--teal)}.phase-marker p{font:11px var(--mono);color:var(--teal);margin:0 0 8px}.phase-marker h2{font-size:31px;letter-spacing:-.035em;margin:0}.phase-marker>b{font:25px var(--mono);color:var(--teal);text-align:right}.micro+.phase-marker{margin-top:110px}.formula b{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;font-variant-numeric:lining-nums tabular-nums;line-height:1.5;white-space:normal;overflow-wrap:anywhere}.formula b sub,.formula b sup{font-size:.62em;line-height:0;position:relative;vertical-align:baseline}.formula b sup{top:-.55em}.formula b sub{bottom:-.18em}.concept-bridge{margin:28px 0;padding:22px 24px;background:#eef3ec;border-left:4px solid var(--teal)}.concept-bridge small{font:9px var(--mono);letter-spacing:.1em;color:var(--teal)}.concept-bridge h3{font-size:18px;margin:9px 0}.concept-bridge p{margin:0;color:#40534c;line-height:1.75;font-size:14px}.teacher-answer{margin:20px 0 0;padding:26px;background:#fff8d7;border:1px solid #d5bb45;box-shadow:8px 8px 0 #eadb96}.teacher-answer>header{display:flex;justify-content:space-between;font:10px var(--mono);letter-spacing:.1em;color:#795f00}.teacher-answer>h3{font-size:24px;margin:22px 0 10px}.teacher-answer ol{margin:0 0 22px;padding-left:22px}.teacher-answer li{padding:5px 0;line-height:1.6}.teacher-answer>div{border-top:1px solid #d8ca87;padding:15px 0 0;margin-top:15px}.teacher-answer>div>b{font:10px var(--mono);color:#795f00}.teacher-answer>div p{line-height:1.7;margin:7px 0 0}.teacher-answer .teaching-note{border-left:4px solid var(--teal);padding:15px 16px;background:#eef3ec}.teacher-view .micro{border-color:#aa9025}.teacher-view .lesson-topbar{box-shadow:inset 0 -4px #d5bb45}@media(max-width:850px){.case-brief{padding:30px 22px}.case-ledger{grid-template-columns:1fr 1fr}.case-ledger span{border-bottom:1px solid #ffffff2b}.phase-marker{grid-template-columns:1fr auto}.phase-marker>span{grid-column:1/-1}.phase-marker h2{font-size:24px}.phase-marker>b{grid-column:2;grid-row:2}.formula b{font-size:18px}.formula{overflow-x:auto}.concept-bridge{padding:18px}.teacher-answer{padding:20px 16px}}