@view-transition{navigation:auto}:root{--ink:#142d50;--muted:#5e6f85;--blue:#275fc8;--line:#e0e5ec;--pale:#f5f7fa;--serif:"Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:32px}body{min-width:1100px;color:var(--ink);word-break:keep-all;-webkit-font-smoothing:antialiased;background:#fff;margin:0;font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Noto Sans KR,Yu Gothic,sans-serif;font-size:18px;line-height:1.75}a{color:inherit;text-decoration:none}a,button{-webkit-tap-highlight-color:transparent}a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--blue);outline-offset:5px;border-radius:2px}::selection{background:#dce8ff}h1,h2,h3,p{margin:0}ul{margin:0;padding:0;list-style:none}.shell{width:calc(100% - 128px);max-width:1240px;margin-inline:auto}.site-header{border-bottom:1px solid var(--line)}.header-inner{justify-content:space-between;align-items:center;height:94px;display:flex}.brand{letter-spacing:-.7px;align-items:center;gap:13px;font-size:19px;font-weight:650;display:inline-flex}nav{gap:38px;height:100%;font-size:15px;font-weight:550;display:flex}nav a{height:100%;color:var(--muted);border-bottom:2px solid #0000;align-items:center;gap:14px;padding-top:2px;display:flex}nav a:hover,nav a[aria-current]{color:var(--ink);border-color:var(--ink)}.skip-link{background:var(--ink);color:#fff;z-index:10;padding:10px 20px;position:absolute;top:-100px;left:20px}.skip-link:focus{top:12px}.home-intro{padding-top:71px}.eyebrow{letter-spacing:2.1px;color:var(--blue);align-items:center;gap:12px;font-size:12px;font-weight:650;display:flex}.eyebrow-line{background:currentColor;width:25px;height:1px}.intro-columns{grid-template-columns:1fr 285px;align-items:end;gap:50px;margin-top:29px;margin-bottom:54px;display:grid}h1{letter-spacing:-2.5px;font-size:48px;font-weight:650;line-height:1.45}.intro-columns h1 span{color:#64758e;font-weight:400}.intro-aside{padding-bottom:5px;font-size:16px;line-height:1.9}.intro-aside p{color:var(--muted);margin-bottom:20px}.text-link{color:var(--blue);align-items:center;gap:18px;font-size:15px;font-weight:600;display:inline-flex}.text-link:hover{text-underline-offset:5px;text-decoration:underline}.text-link span{font-size:19px}.intro-foot{border-top:1px solid var(--line);color:var(--muted);letter-spacing:.2px;justify-content:space-between;padding-top:17px;font-size:13px;display:flex}.browse-section{margin-top:68px}.section-heading{justify-content:space-between;align-items:center;margin-bottom:22px;display:flex}h2{letter-spacing:-.8px;font-size:23px;font-weight:600;line-height:1.5}.section-heading p{color:var(--muted);font-size:14px}.browse-grid{border:1px solid var(--line);grid-template-columns:repeat(3,1fr);display:grid}.browse-card{padding:24px 28px 26px;transition:background .2s}.browse-card+.browse-card{border-left:1px solid var(--line)}.browse-card:hover{background:var(--pale)}.card-top,.card-bottom{justify-content:space-between;align-items:center;display:flex}.card-top{margin-bottom:29px}.section-number{color:var(--blue);font-family:ui-monospace,monospace;font-size:13px}.card-english{letter-spacing:1.5px;color:var(--muted);font-size:12px}.card-bottom h3{letter-spacing:-.7px;font-size:21px;font-weight:550}.circle-arrow{border:1px solid var(--line);border-radius:50%;place-content:center;width:30px;height:30px;font-size:17px;transition:background .2s,color .2s;display:grid}.browse-card:hover .circle-arrow{background:var(--ink);color:#fff;border-color:var(--ink)}.browse-card p{color:var(--muted);margin-top:8px;font-size:14px}.recent-section{margin-top:54px;margin-bottom:72px}.heading-with-count{align-items:center;gap:12px;display:flex}.count{color:var(--muted);text-align:center;background:#eef2f7;border-radius:3px;min-width:25px;padding:0 7px;font-family:ui-monospace,monospace;font-size:13px}.empty-state{text-align:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(#fbfcfe,#fff);padding:50px 20px 43px}.empty-symbol{color:#8797af;margin-bottom:22px;font-family:Georgia,serif;font-size:38px;line-height:1}.empty-state h3{letter-spacing:-.4px;font-size:18px;font-weight:550}.empty-state p{color:var(--muted);margin-top:8px;font-size:14px}.empty-caption{letter-spacing:.3px;color:var(--muted);margin-top:23px;font-size:12px;display:inline-block}.site-footer{border-top:1px solid var(--line);color:var(--muted);align-items:center;gap:25px;padding:29px 0 40px;font-size:12px;display:flex}.footer-name{color:var(--ink);font-size:14px;font-weight:550}.footer-domain{letter-spacing:.5px;margin-left:auto}.breadcrumb{color:var(--muted);gap:12px;padding-top:28px;font-size:13px;display:flex}.breadcrumb a:hover{color:var(--blue)}.page-heading{padding:39px 0 38px}.page-heading .eyebrow{margin-bottom:13px}.page-heading h1{letter-spacing:-1.8px;font-size:40px}.page-heading p{color:var(--muted);margin-top:12px;font-size:16px}.archive-layout{grid-template-columns:215px minmax(0,1fr);gap:50px;padding-bottom:80px;display:grid}.archive-sidebar{border-top:2px solid var(--ink);padding-top:18px}.all-problems-link{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding-bottom:20px;font-size:15px;font-weight:600;display:flex}.filter-group{border-bottom:1px solid var(--line);padding:23px 0}.filter-group h2{margin-bottom:13px;font-size:14px;font-weight:650}.filter-group ul{gap:8px;display:grid}.filter-group a{border-radius:3px;justify-content:space-between;gap:8px;margin-left:-8px;padding:4px 8px;font-size:14px;display:flex}.filter-group a:hover{background:var(--pale)}.filter-group a[aria-current]{color:var(--blue);background:#eef4ff}.filter-group a span:last-child{color:var(--muted);font-family:ui-monospace,monospace;font-size:12px}.filter-empty{color:var(--muted);font-size:13px}.archive-results{min-width:0}.archive-results .section-heading{padding-top:15px}.archive-results h2{font-size:19px}.sort-label{color:var(--muted);font-size:13px}.archive-results .empty-state{padding-block:97px}.list-head,.problem-row{grid-template-columns:minmax(0,1fr) 95px 115px 24px;align-items:center;gap:18px;display:grid}.list-head{border-block:1px solid var(--line);background:var(--pale);color:var(--muted);padding:11px 18px;font-size:12px}.problem-row{border-bottom:1px solid var(--line);padding:23px 18px;transition:background .2s}.problem-row:hover{background:#f7faff}.problem-university{font-size:18px;font-weight:550;display:block}.problem-university small{color:var(--muted);margin-left:9px;font-size:12px;font-weight:400}.problem-title{color:var(--muted);margin-top:3px;font-size:14px;display:block}.problem-year{font-variant-numeric:tabular-nums;font-size:16px}.category-label{color:var(--muted);font-size:13px}.row-arrow{color:var(--blue)}.draft-tag{color:#795d19;background:#faf4e4;margin-top:8px;padding:1px 7px;font-size:12px;display:inline-block}.draft-notice{color:#745e2c;background:#faf4e4;border-left:2px solid #ba9b4e;margin-top:27px;padding:12px 18px;font-size:14px}.problem-header{border-bottom:1px solid var(--line);padding:32px 0}.problem-header h1{letter-spacing:-1.5px;margin-block:15px 17px;font-size:36px}.problem-meta{color:var(--muted);align-items:center;gap:24px;font-size:14px;display:flex}.problem-meta a:hover{color:var(--blue);text-decoration:underline}.source-link{margin-left:auto}.problem-statement{margin-block:34px 45px}.problem-statement>h2{align-items:baseline;gap:14px;margin-bottom:23px;font-size:21px;display:flex}.label-en{color:var(--muted);letter-spacing:1.5px;font-size:12px;font-weight:400}.statement-body{font-family:var(--serif);background:#f7f9fc;border-left:2px solid #bccbe1;padding:28px 34px;font-size:19px;line-height:2}.statement-body p+p{margin-top:14px}.statement-body ol{margin:16px 0 0;padding-left:28px}.solution-title{align-items:baseline;gap:18px;margin-bottom:18px;display:flex}.solution-title p{color:var(--muted);font-size:14px}.solution-head{border-top:2px solid var(--ink);border-bottom:1px solid var(--line);background:#f8fafc;grid-template-columns:1fr 1fr;display:grid}.solution-head>div{padding:17px 30px;font-size:17px;font-weight:550}.solution-head>div+div{border-left:1px solid var(--line)}.solution-head small{color:var(--muted);margin-left:14px;font-size:12px;font-weight:400}.solution-step{border-bottom:1px solid var(--line);grid-template-columns:minmax(0,1fr) minmax(0,1fr);display:grid}.model-answer,.explanation{overflow-wrap:anywhere;min-width:0;padding:29px 30px 32px}.model-answer{font-family:var(--serif);line-height:2}.explanation{border-left:1px solid var(--line);color:#465872;background:#fcfdff;font-size:17px;line-height:1.95}.model-answer>*+*,.explanation>*+*{margin-top:14px}.step-label{color:#8390a2;letter-spacing:1px;margin-bottom:13px;font-family:-apple-system,BlinkMacSystemFont,sans-serif;font-size:12px;display:block}.explanation strong{color:var(--ink);font-weight:650}.solution-step h3{font-size:18px}.katex-display{max-width:100%;padding:8px 2px;overflow:auto hidden}.katex{font-size:1.08em}.related-section{margin-block:53px 70px}.related-empty{border-block:1px solid var(--line);color:var(--muted);padding:23px 0;font-size:15px}.back-link{margin-bottom:36px}.not-found{text-align:center;padding:110px 0 130px}.not-found .eyebrow{justify-content:center;margin-bottom:15px}.not-found h1{font-size:37px}.not-found p{color:var(--muted);margin:20px 0 30px;font-size:16px}.button-link{color:#fff;background:var(--ink);align-items:center;gap:35px;padding:11px 22px;font-size:15px;display:inline-flex}.button-link:hover{background:var(--blue)}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}::view-transition-old(root),::view-transition-new(root){animation:none}}
