:root{font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#1e3029;background:#f4f5f2;font-synthesis:none;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}body{margin:0}a{-webkit-tap-highlight-color:transparent}
.portal-header{height:70px;max-width:1300px;padding:0 44px;margin:auto;display:flex;align-items:center;justify-content:space-between}
.wordmark{display:inline-flex;gap:10px;align-items:center;color:inherit;text-decoration:none;font-size:20px;font-weight:750;letter-spacing:-.7px}
.brand-symbol{display:grid;place-items:center;width:33px;height:33px;border-radius:10px;background:#284e3b;color:#fff;font-size:25px;line-height:1;font-weight:800;padding-bottom:5px}
.header-label{font-size:10px;color:#89928b;letter-spacing:.18em;font-weight:550}
.portal-main{max-width:1208px;margin:17px auto 32px;padding:0 32px}
h1{font-size:clamp(30px,3vw,39px);font-weight:650;line-height:1.2;letter-spacing:-1.6px;margin:0 0 25px}
.subjects{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.subject{--accent:#b4e5bd;--base:#14251e;position:relative;display:flex;flex-direction:column;isolation:isolate;overflow:hidden;border-radius:15px;background:var(--base);color:#f4f8f3;text-decoration:none;border:1px solid #ffffff09;box-shadow:0 2px 3px #17281d08,0 10px 25px #17281d07;transition:box-shadow .22s,border-color .22s}
.subject::before{content:"";position:absolute;inset:0;z-index:-1;background:radial-gradient(ellipse at 60% 70%,color-mix(in srgb,var(--accent) 9%,transparent),transparent 67%);opacity:.6;transition:opacity .35s}
.subject::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;box-shadow:inset 0 1px #ffffff12}
.subject:hover,.subject:focus-visible{border-color:color-mix(in srgb,var(--accent) 50%,transparent);box-shadow:0 6px 30px #17281d18}
.subject:hover::before,.subject:focus-visible::before{opacity:1}
.subject-label{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1;padding:20px 25px 0}
.subject h2{margin:0;font-size:25px;line-height:1.3;font-weight:600;letter-spacing:-.7px}
.enter{font-size:25px;line-height:1;opacity:.35;font-weight:300;transform:translate(-2px,2px);color:var(--accent);transition:transform .25s,opacity .25s}
.subject:hover .enter,.subject:focus-visible .enter{transform:translate(1px,-1px);opacity:1}
.subject-visual{height:clamp(170px,27vh,250px);width:100%;overflow:hidden;position:relative}
.subject-visual canvas{display:block;width:100%;height:100%;object-fit:contain}
.chemistry{--base:#2b211e;--accent:#edb17b}.biology{--base:#12292b;--accent:#8fd9ce}.earth{--base:#142235;--accent:#99bce7}
.subject:focus-visible,.wordmark:focus-visible{outline:3px solid #719c7c;outline-offset:5px}
@media(min-height:900px) and (min-width:1000px){.portal-main{margin-top:35px}h1{margin-bottom:30px}.subjects{gap:22px}.subject-label{padding-top:23px}}
@media(max-width:680px){.portal-header{height:66px;padding:0 22px}.portal-main{margin-top:18px;padding:0 18px}.wordmark{font-size:18px}.subjects{grid-template-columns:1fr;gap:14px}h1{font-size:32px;margin-bottom:23px}.subject-label{padding:18px 23px 0}.subject-visual{height:205px}.subject h2{font-size:24px}}
@media(prefers-reduced-motion:reduce){.subject,.subject::before,.enter{transition:none}.subject:hover .enter,.subject:focus-visible .enter{transform:none}}