:root{--paper:#F7F5F0;--ink:#111442;--accent:#C84933;--sand:#eee9df;--line:#d7d4cb;--muted:#54576a;--latin:"Lato","Helvetica Neue",Arial,sans-serif;--sans:"Zen Maru Gothic","Hiragino Maru Gothic ProN","Hiragino Sans",Meiryo,sans-serif}*{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:26px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.95 var(--sans);letter-spacing:.025em;-webkit-font-smoothing:antialiased}button,a,summary{-webkit-tap-highlight-color:transparent}a{color:inherit;text-underline-offset:5px}button{font:inherit;color:inherit}a:focus-visible,button:focus-visible,summary:focus-visible,.table-wrap:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.icon{width:20px;height:20px;stroke-width:1.5;flex-shrink:0;vertical-align:middle}button{cursor:pointer}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-weight:400}.skip{position:absolute;left:20px;top:-100px;padding:10px 16px;background:var(--paper);z-index:100}.skip:focus{top:8px}
.top{max-width:1120px;margin:auto;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:24px 32px;gap:16px}.brand{display:inline-flex;gap:18px;align-items:center;text-decoration:none;line-height:1;white-space:nowrap}.brand-name{font:400 50px var(--latin);letter-spacing:-.07em}.brand-kind{font:400 8px/1.65 var(--latin);letter-spacing:.15em;padding-top:6px}.header-link{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:13px}.header-link .icon{width:15px}.eyebrow{font:400 12px/1.5 var(--latin);letter-spacing:.16em;color:var(--accent)}
.hero{max-width:1056px;margin:56px auto 70px;display:grid;grid-template-columns:1fr 1.08fr;gap:64px;align-items:center;padding:0 28px}.hero h1{font-size:clamp(32px,4vw,42px);line-height:1.65;letter-spacing:.055em;margin:20px 0 25px}.intro{color:var(--muted);line-height:2.15;font-size:15px}.meta{font-size:12px;color:var(--muted);margin-top:23px}.text-link{display:inline-flex;gap:20px;align-items:center;font-size:14px;text-decoration:none;margin-top:25px;border-bottom:1px solid var(--ink);padding-bottom:8px}.hero-photo{height:420px;overflow:hidden;border-radius:2px}.hero-photo img{width:100%;height:100%;object-fit:cover;object-position:50% 69%;display:block}
.collection{max-width:1000px;margin:0 auto;padding:0 28px}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}.section-head h2{font-size:25px;line-height:1.7;margin-top:12px}.section-head>p{max-width:14em;font-size:13px;color:var(--muted)}.tool-nav{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:28px}.tool-nav-item{position:relative;padding:25px 9px 22px;text-decoration:none;text-align:center;font-size:12px;line-height:1.65;display:flex;align-items:center;flex-direction:column;gap:13px;transition:background .25s,color .25s}.tool-nav-item+.tool-nav-item{border-left:1px solid var(--line)}.tool-nav-item>.icon{width:29px;height:29px;stroke-width:1.25}.tool-nav-item::after{content:"";position:absolute;bottom:-1px;left:15%;width:70%;height:2px;background:var(--accent);transform:scaleX(0);transition:transform .25s}.tool-nav-item:hover,.tool-nav-item[aria-current="true"]{background:var(--sand)}.tool-nav-item:hover::after,.tool-nav-item[aria-current="true"]::after{transform:scaleX(1)}.notice{font-size:12px;color:var(--muted);margin:14px 0 0}
.journey{display:grid;grid-template-columns:minmax(0,.96fr) minmax(0,1.04fr);gap:64px;margin-top:52px;align-items:start}.visual-sticky{position:sticky;top:48px;padding-top:8px;z-index:2}.visual-stage{position:relative;height:440px;background:var(--sand);border:1px solid #1114420b;border-radius:3px;overflow:hidden}.visual-plane{position:absolute;inset:0;padding:28px 28px 64px;display:flex;flex-direction:column;align-items:center;opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .65s cubic-bezier(.2,.65,.3,1);pointer-events:none}.visual-plane.is-active{opacity:1;transform:translateY(0)}.visual-top{width:100%;display:flex;justify-content:space-between;font:400 11px var(--latin);letter-spacing:.14em;color:var(--muted)}.product-art{flex:1;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:27px;min-height:0}.product-icon{width:104px;height:104px;stroke-width:.85;color:var(--ink)}.product-name{font-size:23px;text-align:center;line-height:1.5;letter-spacing:.015em}.visual-plane[data-visual="cambridge"] .product-name{font-size:20px}.visual-line{font-size:13px;color:var(--muted);margin:0 0 15px;text-align:center}.visual-tags{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.visual-tags span{font-size:11px;padding:3px 11px;border:1px solid #11144220;border-radius:99px;color:var(--muted);line-height:1.6}.visual-more{position:absolute;bottom:0;left:0;width:100%;height:47px;display:flex;align-items:center;justify-content:space-between;padding:0 22px;background:none;border:0;border-top:1px solid #1114421a;font-size:13px;text-align:left;z-index:4}.visual-more .icon{width:17px;transition:transform .25s}.visual-more[aria-expanded="true"] .icon{transform:rotate(45deg)}.visual-note{position:absolute;inset:auto 0 47px;background:var(--ink);color:var(--paper);padding:25px;z-index:3;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .22s,transform .22s,visibility .22s;box-shadow:0 -20px 60px #11144210}.visual-note .eyebrow{color:#e6aa92;font-size:10px}.visual-note>p:nth-child(2){font-size:15px;line-height:1.95;margin-top:10px}.visual-note>a{display:inline-flex;gap:12px;align-items:center;font-size:13px;margin-top:15px}.visual-stage.is-open .visual-note{opacity:1;visibility:visible;transform:translateY(0)}.journey-progress{height:2px;background:var(--line);margin-top:20px;overflow:hidden}.journey-progress span{display:block;height:100%;width:20%;background:var(--accent);transition:width .5s ease}.journey-caption{display:flex;justify-content:space-between;gap:12px;font:400 10px/1.6 var(--latin);letter-spacing:.12em;color:var(--muted);margin-top:12px}.journey-caption span{letter-spacing:.01em}
.step{position:relative;min-height:640px;padding:42px 0 90px;scroll-margin-top:55px;display:flex;align-items:center}.step-content{width:100%;transition:opacity .4s,transform .5s}.step-eyebrow{display:flex;gap:14px;align-items:baseline;font:400 12px/1.7 var(--latin);color:var(--accent);letter-spacing:.12em;margin-bottom:20px}.step-eyebrow span{font-family:var(--sans);color:var(--muted);letter-spacing:.02em;font-size:13px}.step h3{font-size:27px;line-height:1.75;letter-spacing:.03em;margin-bottom:25px}.step-description{font-size:15px;color:var(--muted);line-height:2}.connection{display:flex;align-items:flex-start;gap:11px;font-size:13px;line-height:1.9;color:var(--muted);padding:19px 0;border-top:1px solid var(--line);margin-top:25px}.connection .icon{width:18px;height:18px;margin-top:4px;color:var(--accent)}.tool-details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px 0}.tool-details summary{display:flex;align-items:center;justify-content:space-between;font-size:13px;cursor:pointer;list-style:none}.tool-details summary::-webkit-details-marker{display:none}.tool-details summary .icon{width:16px;height:16px;transition:transform .2s}.tool-details[open] summary .icon{transform:rotate(45deg)}.tool-details dl{margin:18px 0 0}.detail{display:grid;grid-template-columns:76px minmax(0,1fr);gap:12px;font-size:13px;margin:13px 0}.detail dt{font-weight:500}.detail dd{margin:0;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:14px;min-height:51px;padding:12px 19px;border:1px solid var(--ink);border-radius:3px;background:var(--ink);color:var(--paper);text-decoration:none;font-size:13px;transition:background .2s}.button:hover{background:#292e55}.button.secondary{background:none;color:var(--ink)}.button.secondary:hover{background:var(--sand)}.link-note{font-size:11px;color:var(--muted);margin-top:10px;line-height:1.9}.next-thought{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:12px;margin-top:33px}.next-thought .icon{width:15px;height:15px;color:var(--accent)}
.lower-content{max-width:780px;margin:35px auto 0;padding:0 28px}.compare{border-top:1px solid var(--line);padding-top:45px}.compare h2,.faq h2{font-size:23px;margin-bottom:23px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px;min-width:500px}th,td{padding:15px 12px;border-bottom:1px solid var(--line)}thead th{background:var(--sand);font-weight:500}tbody th{font-weight:400}.faq{padding-top:50px}.faq details,.policies details{border-top:1px solid var(--line);padding:17px 0}.faq summary,.policies summary{font-size:14px;cursor:pointer}.faq details p,.policies details p{font-size:13px;color:var(--muted);margin-top:12px}.about{margin-top:45px;padding:28px 24px;background:var(--sand);border-left:2px solid #cda18d;display:grid;grid-template-columns:112px minmax(0,1fr);column-gap:24px;row-gap:12px;align-items:start}.about-portrait{display:block;width:112px;height:auto;aspect-ratio:1;object-fit:contain;grid-column:1;grid-row:1 / 3}.about h2{grid-column:2;font:400 25px/1.3 var(--latin)}.about-content{grid-column:2;min-width:0;overflow-wrap:anywhere}.about p{font-size:14px;color:var(--muted);margin:0 0 12px}.about a{font-size:14px}.policies{padding:28px 0 40px}footer{max-width:1120px;border-top:1px solid var(--line);margin:auto;padding:25px 32px 30px}.footer-main{display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}.credits{display:flex;flex-wrap:wrap;gap:7px 20px;font-size:10px;line-height:1.6;color:var(--muted);margin-top:20px}.credits a{text-decoration-color:var(--line)}
@media(min-width:761px){html.js .step .step-content{opacity:.8;transform:translateY(12px)}html.js .step.is-active .step-content{opacity:1;transform:none}html.js .step:focus-within .step-content{opacity:1;transform:none}}
@media(max-width:900px){.hero{gap:35px}.journey{gap:32px}.visual-stage{height:415px}.visual-plane{padding-inline:20px}.step h3{font-size:25px}.product-name{font-size:21px}}
@media(max-width:760px){.top{padding:20px;gap:12px}.brand{gap:11px}.brand-name{font-size:43px}.brand-kind{font-size:7px}.header-link{font-size:12px;gap:5px}.hero{margin:34px auto 42px;padding:0 22px;grid-template-columns:1fr;gap:28px}.hero h1{font-size:33px;margin:14px 0 18px;line-height:1.6}.intro{font-size:14px;line-height:2}.meta{font-size:11px;margin-top:17px}.text-link{margin-top:18px;font-size:13px}.hero-photo{height:220px}.hero-photo img{object-position:center 72%}.collection{padding:0 22px}.section-head{display:block}.section-head h2{font-size:22px}.section-head>p{max-width:none;margin-top:12px;font-size:12px}.tool-nav{grid-template-columns:repeat(6,minmax(0,1fr));margin-top:24px}.tool-nav-item{grid-column:span 2;font-size:11px;padding:20px 6px 17px;gap:10px}.tool-nav-item>.icon{width:25px;height:25px}.tool-nav-item:nth-child(4){grid-column:2 / span 2;border-left:0}.tool-nav-item:nth-child(-n+3){border-bottom:1px solid var(--line)}.notice{font-size:11px;line-height:1.8}.journey{display:block;margin-top:30px}.visual-sticky{top:0;padding:10px 0 13px;background:var(--paper);box-shadow:0 10px 18px var(--paper)}.visual-stage{height:238px}.visual-plane{padding:15px 18px 49px}.visual-top{font-size:10px}.product-art{flex-direction:row;gap:20px;justify-content:center}.product-icon{width:61px;height:61px;stroke-width:1.1}.product-name{font-size:21px;max-width:205px;text-align:left;line-height:1.5}.visual-plane[data-visual="cambridge"] .product-name{font-size:18px}.visual-line{font-size:12px;margin:0 0 9px}.visual-tags{gap:7px}.visual-tags span{font-size:10px;padding:2px 8px}.visual-more{height:40px;padding:0 17px;font-size:12px}.visual-note{bottom:40px;padding:18px}.visual-note>p:nth-child(2){font-size:13px;line-height:1.8}.visual-note>a{font-size:12px;margin-top:9px}.journey-progress{margin-top:12px}.journey-caption{font-size:9px;margin-top:8px}.step{min-height:600px;padding:38px 0 75px;scroll-margin-top:310px;align-items:flex-start}.step-content{opacity:1}.step-eyebrow{font-size:11px;margin-bottom:15px}.step-eyebrow span{font-size:12px}.step h3{font-size:25px;margin-bottom:20px}.step-description{font-size:15px}.connection{font-size:13px;margin-top:23px}.actions{gap:9px}.button{flex-grow:1;font-size:13px;padding:12px 15px}.lower-content{margin-top:10px;padding:0 22px}.compare{padding-top:35px}.compare h2,.faq h2{font-size:21px}.about{grid-template-columns:88px minmax(0,1fr);gap:16px;padding:22px 18px}.about-portrait{width:88px;grid-row:1}.about h2{align-self:center}.about-content{grid-column:1 / -1}footer{padding:24px 22px}.credits{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.step-content{opacity:1!important;transform:none!important}}
@media print{.visual-sticky,.hero-photo,.tool-nav,.header-link,.next-thought{display:none}.journey{display:block}.step{min-height:0;break-inside:avoid;padding:25px 0}.step-content{opacity:1!important;transform:none!important}.hero{display:block}.tool-details{display:block}footer{margin-top:25px}}

.official-product-logo{display:block;width:132px;height:132px;object-fit:contain;background:none;flex-shrink:0}.visual-plane[data-visual="studyplus"] .official-product-logo{width:168px;height:168px}.visual-plane[data-visual="studyplus"] .product-art{gap:8px}
@media(max-width:760px){.official-product-logo{width:70px;height:70px}.visual-plane[data-visual="studyplus"] .official-product-logo{width:98px;height:98px}.visual-plane[data-visual="studyplus"] .product-art{gap:8px}}

/* Rounded Japanese typography, with clear weight and size hierarchy. */
body{letter-spacing:.02em}
h1,h2,h3{font-weight:500}
.hero h1{font-weight:700;letter-spacing:.025em}
.section-head h2,.step h3{letter-spacing:.025em}
.product-name,.button,.text-link,.header-link,.tool-details summary{font-weight:500}
.intro,.step-description,.about p{font-size:1rem;line-height:2}

.tool-details{margin-top:24px}
.book-shops{margin-top:28px}
.book-shops .link-note{font-size:12px}
.purchase-phrase{display:inline-block;max-width:100%}
.purchase-heading{font-size:15px;font-weight:500}
.book-choice{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}
.book-choice h4{margin:0;font:700 18px/1.6 var(--latin)}
.book-choice h4 span{font-weight:400;font-size:14px;margin-left:8px}
.book-isbn{font:400 11px/1.8 var(--latin);color:var(--muted);margin-top:4px}
.purchase-actions{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;margin-top:13px}
.purchase-actions .button{padding:12px;gap:8px;flex-wrap:wrap}
.publisher-link{display:inline-flex;align-items:center;gap:12px;min-height:44px;margin-top:16px;font-size:12px}
.pr-label{display:inline-block;color:var(--accent);background:var(--paper);font:700 11px/1.5 var(--latin);padding:2px 5px;border-radius:2px}
.notice-pr{font-size:13px;color:var(--ink);border-left:2px solid var(--accent);padding:10px 14px;background:var(--sand)}
.notice-pr strong{color:var(--accent);margin-right:8px}
.notice-pr p+p{margin-top:6px}
.notice-pr .notice-intro{font-size:14px;line-height:2;margin-bottom:12px}
@media(max-width:380px){.purchase-actions{grid-template-columns:1fr}}
.visual-note .eyebrow{font-family:var(--sans);letter-spacing:.03em}

/* Keep the fixed resource visual compact enough for phone screens. */
@media(max-width:760px){
 .visual-stage{height:210px}
 .visual-plane{padding:14px 16px 52px}
 .product-art{gap:16px}
 .product-name{font-size:19px}
 .visual-plane[data-visual="cambridge"] .product-name{font-size:17px}
 .visual-more{height:44px;font-size:13px}
 .visual-note{bottom:44px}
 .visual-note .eyebrow{font-size:12px}
 .step{scroll-margin-top:280px}
 .tool-details summary,.faq summary,.policies summary{min-height:44px;display:flex;align-items:center;font-size:14px}
 .tool-nav-item{font-size:12px}
 .detail{grid-template-columns:70px minmax(0,1fr);font-size:14px}
 .table-wrap{overflow:visible}
 table{min-width:0;font-size:12px;table-layout:fixed}
 th,td{padding:12px 7px;overflow-wrap:anywhere}
 th:first-child{width:35%}
 th:nth-child(2){width:43%}
 .footer-main{flex-wrap:wrap}
}
@media(max-width:760px) and (max-height:620px){
 .visual-stage{height:180px}
 .visual-tags{display:none}
 .step{scroll-margin-top:250px}
}
@media(max-height:480px){.visual-sticky{position:relative;top:auto}.step{scroll-margin-top:24px}}

@media(max-width:760px){
 .hero h1{font-size:clamp(27px,8.3vw,33px)}
 .visual-note{max-height:calc(100% - 44px);overflow-y:auto;overscroll-behavior:contain}
 .visual-note>a{display:none}
 .detail{display:block}
 .detail dt{margin-bottom:6px}
 table{font-size:14px}
}