:root{--accent:#ae510d;--ink:#28343e;--muted:#626a70;--paper:#fffdfa;--line:#e9e1d5;--rose:#fff0dd;--blue:#42667a;--green:#467364;--orange:#f58b1f}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Malgun Gothic",sans-serif;line-height:1.8;word-break:keep-all}a{color:inherit;text-underline-offset:4px}button{font:inherit;cursor:pointer}button,a,summary{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}.wrap{max-width:1180px;padding:0 34px;margin:auto}header{position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);background:#fffdfaf2;backdrop-filter:blur(12px)}.nav{display:flex;align-items:center;justify-content:space-between;min-height:88px;gap:30px}.brand img{display:block;width:217px;height:77px;object-fit:contain}.nav nav{display:flex;gap:27px;font-size:14px;font-weight:700}.nav nav a{text-decoration:none}.nav nav a:hover{color:var(--accent)}.skip{position:fixed;top:-80px;background:white;padding:12px;z-index:99}.skip:focus{top:0}h1,h2,h3{margin:0 0 .65em;line-height:1.4;letter-spacing:-.045em}h1{font-size:clamp(36px,5vw,62px);font-weight:850;letter-spacing:-.055em}h2{font-size:clamp(29px,3.2vw,40px)}h3{font-size:22px}p{margin:0 0 1em}em{font-style:normal;color:var(--accent)}.eyebrow{display:block;font-size:12px;font-weight:750;letter-spacing:.07em;color:var(--accent);margin:0 0 20px}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:62px;align-items:center;padding:65px 0 56px}.lead{color:var(--muted);font-size:18px;line-height:1.95;margin-top:23px}.actions{display:flex;gap:22px;align-items:center;margin-top:27px}.button{background:var(--accent);color:white;border-radius:7px;display:inline-flex;justify-content:space-between;align-items:center;gap:24px;padding:13px 20px;text-decoration:none;font-size:14px;font-weight:700}.button:hover{background:#91420b}.textlink{font-size:14px;font-weight:700}.hero-note{background:linear-gradient(130deg,#fff9ef,#fff0d8);border:1px solid #efdbb9;border-radius:17px;padding:32px;box-shadow:9px 9px 0 #fff6e8}.hero-note h2{font-size:27px;margin-top:18px}.hero-note p{font-size:14px;color:var(--muted)}.tag{display:inline-block;color:var(--accent);font-weight:750;font-size:12px;letter-spacing:.01em}.hero-numbers{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #e7d4b7;padding-top:19px;margin:22px 0 12px}.hero-numbers b{font-size:39px;line-height:1.4}.hero-numbers b span{font-size:14px;font-weight:600;margin-left:8px}.hero-numbers small{display:block;color:var(--muted);font-size:12px}.small{font-size:11px!important;margin:0}.letter{max-width:900px;margin:0 auto;padding:42px 30px 46px;border-top:1px solid var(--line);font-size:17px;line-height:2}.letter strong{font-weight:700;color:var(--accent)}.signature{text-align:right;font-size:14px;margin-top:22px}.section{padding:67px 0;border-top:1px solid var(--line)}.section-heading{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;margin-bottom:28px}.section-heading>p{font-size:15px;color:var(--muted);padding-top:35px}.path{display:flex;align-items:center;justify-content:space-between;gap:16px;border:1px solid var(--line);padding:19px 25px;background:#fff;border-radius:9px;font-size:13px;font-weight:650}.path b{color:#d2994d}.evidence{margin-top:30px;display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.evidence-card{background:white;border:1px solid var(--line);border-radius:12px;overflow:hidden}.evidence-body{padding:25px 27px}.evidence-card h3{font-size:22px;margin:10px 0}.evidence-card p{font-size:14px;color:var(--muted)}.evidence-card .source-file{font-size:12px;margin:13px 0 0;padding-top:13px;border-top:1px solid var(--line)}.evidence-card details{margin-top:13px}.evidence-card summary{font-size:13px;font-weight:750;cursor:pointer}.evidence-card details p{font-size:12px;margin-top:12px}.evidence-image{display:block;background:#fbfaf7;padding:15px;border-top:1px solid var(--line)}.evidence-image img{width:100%;max-height:360px;object-fit:contain;display:block}.evidence-image span{display:block;font-size:11px;color:var(--muted);text-align:center;margin-top:8px}.note{font-size:12px;color:var(--muted);line-height:1.9;margin:20px 0 0}.difficulty{display:flex;border-radius:10px;overflow:hidden;min-height:93px;margin-top:30px}.difficulty>div{display:flex;flex-direction:column;justify-content:center;padding:16px 20px;color:white;min-width:100px}.difficulty b{font-size:25px;line-height:1.4}.difficulty span{font-size:12px}.difficulty .s1{background:var(--green)}.difficulty .s2{background:var(--blue)}.difficulty .s3{background:#ba6218}.legend{display:flex;justify-content:space-between;font-size:12px;gap:12px;padding:15px 2px;color:var(--muted)}.legend b{color:var(--accent);margin-right:8px}.toolbar{display:flex;justify-content:space-between;align-items:center;margin:22px 0 13px}.filters,.scenario>div{display:flex;gap:8px;flex-wrap:wrap}.filters button,.scenario button{font-size:13px;padding:7px 17px;border:1px solid var(--line);border-radius:24px;background:#fff;color:var(--muted)}.filters button[aria-pressed=true],.scenario button[aria-pressed=true]{background:var(--ink);color:#fff;border-color:var(--ink)}#visible-count{font-size:12px;color:var(--muted)}.table-wrap{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:white}table{border-collapse:collapse;width:100%;table-layout:fixed}thead{background:#f5f1e9}td,th{padding:16px 21px;border-bottom:1px solid var(--line);text-align:left;font-size:14px;vertical-align:middle}thead th{font-size:12px}th:first-child{width:88px}th:nth-child(2){width:95px}th:last-child{width:65px}td small,th small{display:block;font-size:11px;font-weight:400;color:var(--muted)}.q-title{font-weight:650;display:block}.source-pill{display:block;font-size:12px;color:var(--muted);margin-top:4px}.stars{color:var(--accent);font-size:13px;white-space:nowrap}.open-detail{border:1px solid var(--line);width:31px;height:31px;border-radius:50%;background:#faf7f1;color:var(--ink);font-size:20px;display:grid;place-items:center}.open-detail[aria-expanded=true]{background:#f9e6c8}.q-detail td{padding:0;background:#fcfaf6}.detail-inner{padding:25px 29px;border-left:4px solid #e2b36f}.detail-inner p{font-size:13px;color:var(--muted);margin:0 0 12px}.detail-inner b{color:var(--ink)}.detail-inner h3{font-size:18px}.detail-inner dl{margin:0;font-size:13px;display:grid;grid-template-columns:115px 1fr;gap:11px 20px}.detail-inner dt{font-weight:700}.detail-inner dd{margin:0;color:var(--muted);overflow-wrap:anywhere}.q-main:hover{background:#fffbf3}[hidden]{display:none!important}.cut-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}.cut-panel{background:#fff6e8;border:1px solid #efd6ad;border-radius:13px;padding:32px}.cut-value{color:var(--accent);font-size:70px;line-height:1.35;font-weight:850;letter-spacing:-.05em;margin:13px 0}.cut-value span{font-size:21px;margin-left:13px;letter-spacing:-.04em}.cut-panel p{font-size:14px;color:var(--muted)}.cut-panel p b{color:var(--ink)}.cut-panel.secondary{background:#f0f5f6;border-color:#d3e1e7}.secondary .cut-value,.secondary .tag{color:var(--blue)}.range{height:4px;position:relative;background:#eddfca;margin:24px 0}.range i{position:absolute;background:#b76d27;height:8px;top:-2px;border-radius:6px}.secondary .range{background:#dce7eb}.secondary .range i{background:var(--blue)}.cut-evidence{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;margin:26px 0}.cut-evidence article{border-top:2px solid var(--line);padding-top:17px}.cut-evidence h3{font-size:19px}.cut-evidence p{font-size:13px;color:var(--muted)}.method{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:17px 0}.method summary{font-weight:700;cursor:pointer;font-size:14px}.method p,.method li{font-size:13px;color:var(--muted)}.method>div{padding:15px 5px 0}.scenario{margin-top:25px;background:#faf6ef;border-radius:10px;padding:25px}.scenario h3{font-size:19px}.scenario p{font-size:13px;color:var(--muted);margin:17px 0 0}.materials{display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:center}.materials p{font-size:15px;color:var(--muted)}.download{padding:30px;background:#f9f1e4;border-radius:14px}.download a{width:100%}.download-secondary{display:flex;justify-content:space-between;padding:15px 0;font-weight:650;font-size:14px}.download small{display:block;font-size:12px;color:var(--muted);border-top:1px solid #dfd5c5;padding-top:15px;margin-top:10px}.closing{text-align:center;background:#fff4e2;margin:10px 0 50px;padding:35px 20px 45px;border-radius:15px}.closing img{width:130px;height:130px;object-fit:contain;margin-bottom:13px}.closing h2{font-size:29px}.closing p{font-size:16px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:12px}footer span{float:right}footer p{margin-top:14px;max-width:900px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(max-width:850px){.hero{gap:30px}.hero-note{padding:25px}.hero h1{font-size:43px}.nav nav{gap:15px;font-size:12px}.brand img{width:185px;height:69px}.section-heading{gap:30px}.materials{gap:30px}.wrap{padding:0 24px}.path{font-size:11px;padding:16px}.evidence-body{padding:22px}}
@media(max-width:620px){html{scroll-padding-top:123px}.wrap{padding:0 20px}.nav{display:block;padding-top:5px;padding-bottom:12px;min-height:100px}.brand img{width:180px;height:61px;margin:auto}.nav nav{justify-content:space-between;font-size:11px;gap:10px}.hero{grid-template-columns:1fr;padding:35px 0 30px;gap:27px}.hero h1{font-size:37px;line-height:1.43}.eyebrow{font-size:10px;margin-bottom:16px}.lead{font-size:15px;margin-top:17px}.actions{gap:17px}.button{font-size:12px;padding:12px 16px;gap:12px}.textlink{font-size:12px}.hero-note{padding:24px}.hero-note h2{font-size:25px}.hero-numbers{margin-top:18px}.hero-numbers b{font-size:32px}.letter{padding:32px 0;font-size:15px;line-height:1.95}.section{padding:40px 0}.section-heading{display:block;margin-bottom:20px}.section-heading>p{padding-top:0;font-size:14px}.section-heading h2{font-size:29px}.path{flex-wrap:wrap;justify-content:center;font-size:11px;gap:7px;padding:15px 12px}.evidence{grid-template-columns:1fr;gap:19px;margin-top:22px}.evidence-card h3{font-size:21px}.evidence-card p{font-size:13px}.evidence-body{padding:23px}.difficulty>div{padding:13px 9px;min-width:66px}.difficulty b{font-size:20px}.difficulty span{font-size:10px}.legend{display:grid;font-size:11px;gap:2px}.legend span{display:block}.toolbar{margin-top:15px}#visible-count{font-size:10px}.filters{gap:5px}.filters button{font-size:11px;padding:6px 11px}th:first-child{width:48px}th:nth-child(2){width:53px}th:last-child{width:39px}td,th{padding:12px 6px;font-size:12px}thead th{font-size:10px}td small,th small{font-size:9px}.stars{font-size:10px}.source-pill{font-size:10px}.open-detail{width:26px;height:26px;font-size:18px}.detail-inner{padding:19px 15px}.detail-inner dl{grid-template-columns:1fr;gap:3px;font-size:12px}.detail-inner dd{margin-bottom:13px}.detail-inner p{font-size:12px}.cut-grid{gap:14px}.cut-panel{padding:19px 14px}.cut-value{font-size:48px}.cut-value span{display:block;font-size:15px;margin:0}.cut-panel p{font-size:12px}.cut-panel .tag{font-size:10px}.cut-evidence{grid-template-columns:1fr;gap:13px}.cut-evidence article{padding-top:14px}.cut-evidence h3{font-size:18px}.cut-evidence p{margin-bottom:0}.scenario{padding:20px}.scenario button{font-size:11px;padding:7px 10px}.scenario h3{font-size:17px}.materials{grid-template-columns:1fr;gap:20px}.materials p{font-size:14px}.download{padding:23px}.download-secondary{font-size:13px}.closing{margin-bottom:32px;padding:28px 16px}.closing h2{font-size:24px}.closing p{font-size:14px}.closing img{width:110px;height:110px}footer span{display:block;float:none;margin-top:10px}.note{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{header,.actions,.filters,.open-detail,.scenario,.download{display:none}.wrap{max-width:none;padding:0}.hero,.section,.letter{padding:20px 0}.hero{grid-template-columns:1fr 1fr}.hero h1{font-size:30px}.section{break-before:page}.evidence-card,.cut-panel{break-inside:avoid}body{font-size:11px}.q-detail[hidden]{display:table-row!important}.q-main[hidden]{display:table-row!important}.q-detail td{background:white}.closing img{width:80px;height:80px}footer{font-size:10px}}
.concept-image{display:block;max-width:560px;margin-top:20px;border:1px solid var(--line);background:white;padding:16px;text-decoration:none}.concept-image img{display:block;width:100%;height:auto}.concept-image span{display:block;font-size:12px;margin-top:12px;color:var(--muted)}

.consult{display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:center}.consult p{font-size:15px;color:var(--muted)}.consult strong{color:var(--accent)}.consult aside{padding:30px;background:#f7f1e8;border-radius:14px}.consult ol{padding-left:21px;font-size:14px}.consult li{padding:9px 0;color:var(--muted)}.consult li b{color:var(--ink)}.consult aside p{font-size:12px;border-top:1px solid var(--line);padding-top:16px;margin:18px 0 0}@media(max-width:620px){.consult{grid-template-columns:1fr;gap:20px}.consult aside{padding:24px}.consult p{font-size:14px}.nav nav{gap:6px;font-size:10px}}

.source-overview{display:grid;grid-template-columns:1.15fr 1fr .85fr;align-items:center;gap:25px;padding:34px 30px 22px;background:#fff8ec;border:1px solid #e9d9bf;border-radius:18px;margin:30px 0;scroll-margin-top:20px}.source-intro h3{font-size:25px}.source-intro p{font-size:13px;color:var(--muted);margin:0}.source-intro .eyebrow{font-size:11px;margin-bottom:13px}.print-emphasis{color:#a84a0e}.donut-wrap{position:relative;width:100%;max-width:270px;justify-self:center}.source-donut{display:block;width:100%;height:auto;filter:drop-shadow(0 7px 8px #8950270c)}.donut-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;pointer-events:none}.donut-center>span{font-size:11px;color:var(--muted)}.donut-center b{font-size:46px;line-height:1.3;letter-spacing:-.05em}.donut-center small{font-size:14px;letter-spacing:0;margin-left:4px}.source-legend{display:grid;gap:12px}.source-key{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid #e8dac5}.source-key>i{width:12px;height:12px;border-radius:50%;flex-shrink:0}.source-key>div{flex:1}.source-key b{font-size:16px}.source-key small{display:block;color:var(--muted);font-size:11px;font-weight:400}.source-key>strong{font-size:27px;line-height:1.4;text-align:right;white-space:nowrap}.source-key>strong small{display:inline;font-size:11px;margin-left:4px}.source-key>strong span{display:block;color:var(--muted);font-size:11px;font-weight:500}.source-key-print b,.source-key-print>strong{color:#a74a0e}.source-footnote{grid-column:1/-1;border-top:1px solid #e8dac5;padding-top:15px;margin:0;font-size:11px;color:var(--muted)}.origin-badge{display:inline-flex;align-items:center;padding:5px 11px;margin-bottom:7px;border-radius:5px;font-size:12px;line-height:1.4;font-weight:800;letter-spacing:.03em;white-space:nowrap}.origin-print{background:#b45313;color:#fff;border:1px solid #a04a13;box-shadow:2px 2px 0 #efceb2}.origin-textbook{background:#e6f0f2;color:#365f6b;border:1px solid #bfd3d8}.origin-original{background:#f2efe9;color:#716653;border:1px solid #d9d2c5}.q-main:has(.origin-print){background:#fffaf1}.q-main:has(.origin-print)>th{border-left:4px solid #b45313}.q-main:has(.origin-print):hover{background:#fff2df}.q-title{font-size:13px}.source-pill{display:none}@media(max-width:850px){.source-overview{grid-template-columns:1fr 1fr;gap:18px;padding:25px}.source-intro{grid-column:1/-1}.source-intro p br{display:none}}@media(max-width:620px){.source-overview{padding:22px 16px;gap:12px;grid-template-columns:1fr 1fr}.source-intro h3{font-size:24px}.source-intro p{font-size:12px}.source-intro{margin-bottom:8px}.donut-center b{font-size:30px}.donut-center small{font-size:10px}.donut-center>span{font-size:9px}.source-key{gap:7px;padding:9px 0}.source-key>i{width:9px;height:9px}.source-key b{font-size:13px}.source-key>strong{font-size:22px}.source-key small,.source-key>strong small,.source-key>strong span{font-size:9px}.source-legend{gap:3px}.source-footnote{font-size:10px;padding-top:13px}.origin-badge{font-size:10px;padding:5px 8px;margin-bottom:6px}.q-title{font-size:11px}}

.origin-basic{background:#f2efe9;color:#716653;border:1px solid #d9d2c5}.origin-original{background:#f1eaf4;color:#735c80;border:1px solid #d8c9e0}.source-key-original b,.source-key-original>strong{color:#80618f}

.spectrum{display:grid;gap:27px;margin:35px 0 48px}.spectrum:empty{display:none}.spectrum-row{border:1px solid #e2d6c2;border-radius:14px;background:#fff;overflow:hidden}.spectrum-heading{display:flex;align-items:center;gap:15px;padding:18px 23px;background:#fff6e7;border-bottom:1px solid #eaddc8}.spectrum-heading .origin-badge{margin:0;flex-shrink:0}.spectrum-heading h3{font-size:19px;margin:0;flex:1}.spectrum-hint{font-size:11px;color:var(--muted)}.spectrum-stages{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;padding:22px}.spectrum-stage{min-width:0;position:relative}.spectrum-stage:not(:last-child)::after{content:'→';position:absolute;right:-21px;top:141px;font-size:21px;color:#b58b5a;z-index:2}.spectrum-stage h4{font-size:14px;margin:0 0 12px;display:flex;align-items:center;gap:9px}.spectrum-stage h4>span{font-size:11px;background:#f2eadd;border-radius:50%;width:25px;height:25px;display:grid;place-items:center;color:#987241}.stage-2 h4{color:#a04d12}.stage-2 h4>span{background:#b75b19;color:#fff}.stage-zoom{position:relative;display:block;background:#fff;width:100%;height:245px;padding:14px;border:1px solid #e6e0d6;border-radius:7px;cursor:zoom-in}.stage-zoom img{width:100%;height:100%;object-fit:contain;display:block}.stage-zoom>span{position:absolute;bottom:5px;right:7px;font-size:10px;padding:1px 6px;color:#786b58;background:#fffaf0e8}.stage-2 .stage-zoom{border-color:#dca877;background:#fffdfa}.stage-source{font-size:11px;font-weight:700;line-height:1.6;margin:12px 0 7px;color:#565c5c;overflow-wrap:anywhere}.stage-summary{font-size:12px;color:var(--muted);line-height:1.7;margin:0}.spectrum-change{font-size:13px;background:#faf6ee;margin:0;padding:15px 23px;border-top:1px solid #eee4d5;color:#6a6153}.spectrum-change b{color:#a34f15;margin-right:10px}.textbook-comparison-title{font-size:25px;margin:45px 0 20px}.question-viewer{padding:0;border:1px solid #e3d6c2;border-radius:12px;max-width:min(900px,94vw);max-height:92vh;background:#fffdfa}.question-viewer::backdrop{background:#18232cba}.viewer-bar{position:sticky;top:0;display:flex;align-items:center;gap:25px;justify-content:space-between;padding:13px 19px;background:#fff8ec;border-bottom:1px solid var(--line);z-index:1}.viewer-bar h2{font-size:16px;margin:0}.viewer-bar button{border:1px solid #d4c8b6;border-radius:50%;width:34px;height:34px;background:white;font-size:25px;line-height:1;color:#4d4539}.question-viewer>img{display:block;width:auto;max-width:100%;height:auto;padding:22px;margin:auto}.section-heading h2{font-size:clamp(28px,3vw,37px)}@media(max-width:620px){.spectrum{gap:23px;margin-top:25px}.spectrum-heading{gap:9px;padding:14px 12px;flex-wrap:wrap}.spectrum-heading h3{font-size:15px}.spectrum-hint{width:100%;font-size:9px}.spectrum-stages{gap:9px;padding:12px 9px}.spectrum-stage h4{font-size:10px;gap:4px;line-height:1.6;flex-wrap:wrap;margin-bottom:8px}.spectrum-stage h4>span{width:19px;height:19px;font-size:9px}.stage-zoom{height:140px;padding:5px;border-radius:4px}.stage-zoom>span{font-size:8px;right:1px;bottom:1px;padding:1px 3px}.spectrum-stage:not(:last-child)::after{right:-8px;top:101px;font-size:12px}.stage-source{font-size:9px;line-height:1.5;margin-top:9px}.stage-summary{font-size:10px;line-height:1.65;overflow-wrap:anywhere}.spectrum-change{padding:12px;font-size:11px}.spectrum-change b{display:block;margin-bottom:4px}.textbook-comparison-title{font-size:23px}.question-viewer{max-width:96vw}.question-viewer>img{padding:10px}.viewer-bar{padding:10px 12px}.viewer-bar h2{font-size:14px}}

.exam-review{padding:40px 42px;margin:0 0 55px;background:#fff7e9;border-left:4px solid #bd6b29;border-radius:0 15px 15px 0}.exam-review h2{font-size:32px;margin-bottom:23px}.exam-review>p{font-size:15px;line-height:1.95;color:var(--muted);max-width:950px}.exam-review strong{color:var(--ink)}.exam-review .review-conclusion{border-top:1px solid #eadac1;padding-top:21px;margin:24px 0 0;color:#7f451e}.review-conclusion b{font-size:18px}@media(max-width:620px){.exam-review{padding:27px 23px;margin-bottom:35px}.exam-review h2{font-size:25px}.exam-review>p{font-size:14px}.review-conclusion b{font-size:16px}}