:root{--ink:#183d35;--muted:#5c6c63;--paper:#f8f8f1;--line:#d8dfd5;--orange:#b94929}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;font-size:14px;line-height:1.8}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}button{color:inherit}.wrap{width:min(1180px,calc(100% - 64px));margin-inline:auto}.header{display:flex;justify-content:space-between;align-items:center;padding-block:25px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-size:10px;line-height:1.5;font-weight:750;letter-spacing:1.5px}.brand-mark{display:block;font-size:42px;font-family:Georgia,serif;font-style:italic;line-height:1;letter-spacing:-8px;margin-right:9px}.brand-mark span{color:var(--orange)}nav{display:flex;gap:32px;font-size:12px;font-weight:650}nav a:last-child{border-bottom:1px solid var(--ink)}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:44px;align-items:center;padding-block:75px 80px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;margin:0 0 19px}.hero .eyebrow{display:flex;align-items:center;gap:9px}.eyebrow span{height:6px;width:6px;border-radius:50%;background:var(--orange)}h1{font-size:clamp(30px,4vw,50px);line-height:1.55;letter-spacing:.025em;margin:0 0 23px;font-weight:700}h1 em{font-style:normal;color:#45735f}.intro{line-height:2.2;color:var(--muted);margin-bottom:29px}.primary{display:inline-flex;align-items:center;gap:40px;background:var(--ink);color:white;padding:15px 23px;border-radius:3px;font-size:13px}.primary:hover{background:#2e594a}.hero-note{font-size:10px;color:var(--muted);margin-top:14px}.illustration{position:relative;height:380px;background:#eef1e5;border-radius:50% 50% 4px 4px;overflow:hidden}.grid{position:absolute;inset:0;background-image:linear-gradient(#dce3d555 1px,transparent 1px),linear-gradient(90deg,#dce3d555 1px,transparent 1px);background-size:30px 30px}.orbit{position:absolute;width:75%;height:31%;left:12%;top:31%;border:1px solid #6e8a70;border-radius:50%;transform:rotate(-33deg)}.o2{transform:rotate(33deg)}.o3{transform:rotate(90deg)}.nucleus{position:absolute;left:43%;top:36%;width:62px;height:62px;border-radius:50%;background:#c5d7b7;display:grid;place-items:center;font:italic 40px Georgia;color:#386348}.electron{position:absolute;width:17px;height:17px;background:#cf704d;border-radius:50%}.e1{left:20%;top:30%}.e2{right:23%;top:63%;width:12px;height:12px}.e3{left:48%;top:9%;background:#51735b;width:11px;height:11px}.art-label{position:absolute;font-size:8px;letter-spacing:2px;color:#4e6b56}.l1{top:24%;right:13%}.l2{bottom:23%;left:11%}.wave{position:absolute;font:60px Georgia;color:#bf6748;right:10%;bottom:14%}.leaf{position:absolute;width:40px;height:66px;background:#8da887;border-radius:0 90% 0 90%;left:12%;bottom:10%;transform:rotate(-20deg)}.leaf2{left:20%;bottom:8%;transform:rotate(65deg);width:30px;height:52px;background:#b1c3a2}.art-plus{position:absolute;right:15%;top:12%;font-size:22px;color:#80977b}.art-caption{position:absolute;bottom:0;inset-inline:0;border-top:1px solid #d0d9c8;padding:10px 18px;font-size:9px;display:flex;justify-content:space-between;color:#52664e;background:#eef1e5}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:27px}.section-head .eyebrow{margin-bottom:7px}h2{font-size:25px;letter-spacing:.025em;margin:0;line-height:1.6}.section-head>p{font-size:12px;color:var(--muted);margin:0}.subjects{padding-bottom:66px;border-bottom:1px solid var(--line)}.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.subject{padding:22px 20px 19px;border:1px solid var(--line);border-radius:5px;background:#f0f2e8;transition:transform .2s,box-shadow .2s}.subject:hover{transform:translateY(-4px);box-shadow:0 6px 16px #193a3510}.physics{--accent:#405b79;--tint:#edf1f5}.chemistry{--accent:#416b4d;--tint:#eef3e8}.life{--accent:#94612b;--tint:#f8efdf}.inquiry{--accent:#776186;--tint:#f2edf5}.subject.physics{background:#edf1f3}.subject.life{background:#f5eee1}.subject.inquiry{background:#efebf1}.card-top{display:flex;justify-content:space-between;align-items:center;color:var(--accent);font-size:11px}.subject-icon{font-size:35px;line-height:1.2;font-family:Georgia,serif}.subject-en{font-size:8px;letter-spacing:1.4px;margin:28px 0 4px;color:var(--accent);font-weight:700}.subject h3{font-size:21px;margin:0 0 12px}.subject>p:not(.subject-en){font-size:11px;margin-bottom:24px;white-space:normal}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:7px;font-size:9px;color:var(--muted)}.arrow{font-size:20px;color:var(--accent)}.learning{padding-block:60px}.tools{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:30px 0 17px}.filters{display:flex;gap:7px;flex-wrap:wrap}.filters button{border:1px solid var(--line);border-radius:25px;background:transparent;padding:8px 15px;font-size:11px;min-height:44px}.filters button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}.search{display:flex;gap:9px;align-items:center;border-bottom:1px solid #9cae9e;padding:7px;min-width:200px}.search>span:first-child{font-size:25px;line-height:1}.search input{background:none;border:0;min-width:0;width:180px;color:var(--ink);font-size:12px;min-height:30px}.count{font-size:11px;color:var(--muted);margin:12px 0}.lesson-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;align-items:start}.lesson{background:#fffef9;border:1px solid var(--line);padding:23px;border-radius:4px}.lesson-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:10px;color:var(--muted)}.badge{background:var(--tint);color:var(--accent);padding:3px 9px;border-radius:2px;font-weight:700}.lesson-label{font-size:10px;color:var(--muted);margin:24px 0 5px}.lesson h3{font-size:19px;margin:0}.tags{font-size:10px;color:var(--muted);margin:9px 0 21px}.lesson summary{border-top:1px solid var(--line);padding-block:14px 0;font-size:12px;font-weight:650;min-height:44px}.lesson summary>span{float:right}.lesson-body{font-size:13px;padding-top:12px}.question{background:var(--tint);padding:15px;margin-block:20px}.question h4{font-size:11px;margin:0 0 7px;color:var(--accent)}.question p{margin:0}.answer summary{font-size:11px}.empty{padding:35px;text-align:center;border:1px dashed var(--line)}.empty h3{font-size:17px}.empty button{padding:10px 20px;background:var(--ink);color:white;border:0;border-radius:3px}.closing{display:flex;align-items:center;gap:30px;background:#e9eee3;padding:35px 40px;border-radius:4px;margin-bottom:55px}.closing-icon{font-size:70px;color:#6e8e63}.closing .eyebrow{font-size:8px;margin-bottom:8px}.closing h2{font-size:23px}.closing p:last-child{font-size:12px;color:var(--muted);margin-bottom:0}.closing a{font-size:11px;margin-left:auto;white-space:nowrap;border-bottom:1px solid var(--ink)}footer{border-top:1px solid var(--line);padding-block:22px 30px;display:flex;justify-content:space-between;font-size:9px;letter-spacing:1px;color:var(--muted)}footer p{margin:0}.skip{position:fixed;top:-100px;left:15px;background:white;padding:12px;z-index:5}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}[hidden]{display:none!important}
@media(max-width:1000px){.subject-grid{grid-template-columns:repeat(2,1fr)}.tools{align-items:stretch;flex-direction:column}.search input{width:100%}.hero{gap:25px}.illustration{height:330px}.hero .eyebrow{font-size:8px;letter-spacing:1px}}
@media(max-width:640px){.wrap{width:calc(100% - 36px)}.header{padding-block:19px}.brand{font-size:8px;gap:9px}.brand-mark{font-size:34px}nav{gap:12px;font-size:10px}nav a:first-child{display:none}.hero{grid-template-columns:1fr;padding-block:42px;gap:25px}h1{font-size:34px}.intro{font-size:13px}.illustration{height:285px;max-width:410px;width:100%;margin:auto}.hero-copy .eyebrow{font-size:8px}.hero-note{font-size:10px}.section-head{display:block}.section-head>p{margin-top:12px;font-size:11px}h2{font-size:23px}.subject-grid{gap:10px}.subject{padding:17px 13px}.subject h3{font-size:18px}.subject-en{font-size:7px;letter-spacing:.7px;margin-top:20px}.subject>p:not(.subject-en){font-size:10px}.card-bottom{font-size:8px;align-items:end}.subject-icon{font-size:28px}.subjects{padding-bottom:36px}.learning{padding-block:36px}.lesson-grid{grid-template-columns:1fr}.lesson{padding:20px}.filters{gap:6px}.filters button{padding:8px 11px;font-size:10px}.tools{margin-top:20px}.closing{padding:25px 22px;gap:17px;flex-wrap:wrap;margin-bottom:32px}.closing-icon{font-size:45px}.closing a{margin-left:62px}.closing h2{font-size:21px}footer{font-size:8px;letter-spacing:.4px;gap:10px}.nucleus{width:50px;height:50px;font-size:32px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.subject{transition:none}}

.app-entry{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:26px 30px;background:#e9eee3;border:1px solid var(--line);border-radius:5px;margin-bottom:50px}.app-entry .eyebrow{margin-bottom:5px}.app-entry h2{font-size:22px}.app-entry p:last-child{font-size:12px;color:var(--muted)}.app-entry .primary{white-space:nowrap}@media(max-width:640px){.app-entry{display:block;padding:22px;margin-bottom:36px}.app-entry h2{font-size:20px}.app-entry .primary{margin-top:8px}}