@charset "UTF-8";
:root{--ink:#103f50;--muted:#58717a;--blue:#097b94;--deep:#073f50;--mint:#e9f3ee;--paper:#fbfcfa;--line:#dce5e4;--orange:#b05a2f;--radius:18px;--font:"BIZ UDPGothic","Yu Gothic",YuGothic,"Hiragino Kaku Gothic ProN",Meiryo,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.9;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}svg{display:block}img{max-width:100%;display:block}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.6;letter-spacing:.025em}h2{font-size:28px}h3{font-size:20px}p+p{margin-top:1em}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ca6c2e;outline-offset:5px}::selection{background:#bce7de}.container{width:min(1200px,calc(100% - 96px));margin-inline:auto}.icon{width:23px;height:23px;flex-shrink:0}.skip-link{position:fixed;top:-100px;left:16px;background:#fff;z-index:100;padding:10px}.skip-link:focus{top:10px}.site-header{height:96px;border-bottom:1px solid var(--line);background:rgba(251,252,250,.97)}.header-inner{height:100%;width:min(1320px,calc(100% - 80px));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;line-height:1.2}.brand>.icon{width:43px;height:43px}.brand>span{font-size:28px;font-weight:800;letter-spacing:.1em}.brand small{display:block;font-size:10px;letter-spacing:.3em;margin:7px 0 0 3px}.main-nav{display:flex;align-items:center;gap:31px;font-size:14px;font-weight:700}.main-nav>a:not(.nav-check){padding:10px 0}.main-nav a:hover,.main-nav a[aria-current]{color:var(--blue)}.nav-check{display:flex;gap:9px;align-items:center;background:var(--mint);padding:12px 20px;border-radius:40px}.nav-check .icon{width:18px}.menu-toggle{display:none}.hero{display:grid;grid-template-columns:1fr 1fr;gap:48px;padding-top:54px;padding-bottom:60px;align-items:center}.eyebrow{font-family:Arial,sans-serif;font-size:11px;font-weight:700;letter-spacing:.17em;line-height:1.6;color:var(--blue)}.hero .eyebrow{display:flex;align-items:center;gap:9px}.hero .eyebrow span{width:24px;height:1px;background:var(--blue)}.hero h1{font-size:clamp(38px,4.3vw,60px);line-height:1.55;letter-spacing:.055em;margin:23px 0 22px;font-weight:750}.hero h1 em{font-style:normal;color:#0b8091}.hero-lead{font-size:16px;line-height:2.1;color:var(--muted);margin-bottom:29px}.button{display:inline-flex;align-items:center;justify-content:center;gap:28px;padding:15px 24px;border-radius:8px;font-size:15px;font-weight:700;line-height:1.7;border:1px solid transparent;transition:transform .2s,background .2s}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--blue);color:#fff}.button.dark{background:var(--deep);color:#fff}.button.light{background:#fff;color:var(--deep)}.button.outline{border-color:var(--line);background:transparent}.hero-note{display:flex;align-items:center;gap:9px;margin-top:17px;color:var(--muted);font-size:12px}.hero-note .icon{width:17px;height:17px}.hero-visual{height:530px;position:relative;border-radius:140px 16px 16px 16px;overflow:hidden;background:#148493}.ocean-image{position:absolute;inset:0;background:linear-gradient(150deg,#9bc9b5,#329eab 45%,#076c87 73%,#073f68);background-image:url('/assets/ocean-hero.webp');background-size:cover;background-position:48% center}.hero-stamp{position:absolute;bottom:64px;left:26px;width:186px;height:186px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;background:#f7fbf0f2;transform:rotate(-8deg);text-align:center;box-shadow:0 6px 22px #06485915}.hero-stamp>span{font-size:12px;margin-bottom:9px}.hero-stamp strong{font-size:18px;line-height:1.65}.hero-stamp>.icon{margin-top:11px;width:30px}.hero-caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,#03384eaf);color:#fff;display:flex;justify-content:space-between;padding:38px 23px 17px;font-size:11px;letter-spacing:.12em}.hero-caption span:first-child{font-family:Arial,sans-serif;font-weight:700}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:26px}.section-heading .eyebrow{margin-bottom:7px}.text-link{display:inline-flex;gap:12px;align-items:center;font-size:14px;font-weight:700;white-space:nowrap}.text-link:hover,.under-link:hover{color:var(--blue)}.text-link .icon{width:19px}.topic-section{padding:25px 0 68px}.topic-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.topic-item{display:flex;align-items:center;gap:12px;padding:28px 18px 28px 0}.topic-item+.topic-item{border-left:1px solid var(--line);padding-left:20px}.topic-item h3{font-size:16px;white-space:nowrap}.topic-item p{font-size:11px;color:var(--muted);margin-top:4px;white-space:nowrap}.topic-icon{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;flex-shrink:0}.topic-item>.icon{margin-left:auto;width:15px}.blue{background:#dfedf3;color:#137b94}.peach{background:#f7e4d7;color:#b05a2f}.green{background:#e0eede;color:#538766}.lavender{background:#e9e8f0;color:#797194}.feature-section{background:#eef5f2;padding:56px 0}.feature-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:66px;align-items:center}.feature-diagram{background:#fff;border:1px solid #dbe6e1;border-radius:var(--radius);padding:23px}.diagram-top{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);margin-bottom:16px}.pill{display:inline-block;font-size:12px;font-weight:700;border-radius:30px;background:#e9f3ee;padding:3px 12px;color:#426b5c}.diagram svg{width:100%;height:auto}.svg-label{font-family:var(--font);font-size:20px;fill:#144d5e;font-weight:700}.svg-small{font-family:var(--font);font-size:16px;fill:#24596a}.diagram-controls{display:flex;gap:15px;align-items:center;padding:15px 0 0;font-size:12px;flex-wrap:wrap}.diagram-controls>span{color:var(--muted)}.small-button{font-size:13px;font-weight:700;color:var(--deep);background:#fff;border:1px solid #bdcecf;border-radius:6px;padding:7px 12px}.small-button:hover{background:#edf5f3}.diagram-controls input[type=range]{accent-color:#0a8190;flex:1;min-width:100px}.diagram-controls output{font-size:12px}.flow-hidden .flow-layer{opacity:0}.flow-layer{transition:opacity .25s}.caption{font-size:12px;color:var(--muted);line-height:1.8;margin-top:14px}.orange{color:var(--orange)}.feature-copy h2{font-size:30px;margin:15px 0 20px;line-height:1.7}.feature-copy>p:not(.eyebrow){font-size:15px;color:var(--muted);line-height:2.1;margin-bottom:26px}.under-link{display:flex;align-items:center;gap:15px;font-size:13px;margin-top:20px;font-weight:700}.under-link .icon{width:16px}.learning-section{padding:72px 0 68px}.subtle{font-size:13px;color:var(--muted)}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:27px}.article-card{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:transform .2s,box-shadow .2s}.article-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px #1246580b}.card-visual{padding:13px 13px 0;background:#eef5f4}.card-visual svg{border-radius:8px}.card-body{padding:23px}.card-meta{display:flex;justify-content:space-between;align-items:center;color:var(--blue);font-size:11px;font-weight:700;margin-bottom:12px}.card-meta>span:last-child{display:flex;align-items:center;gap:5px;color:var(--muted);font-weight:400}.card-meta .icon{width:13px;height:13px}.card-body h3{font-size:18px;min-height:58px}.card-link{font-size:12px;font-weight:700;display:flex;align-items:center;gap:10px;margin-top:15px}.card-link .icon{width:16px}.teacher-banner{display:flex;align-items:center;gap:32px;padding:38px 44px;background:var(--deep);border-radius:16px;color:#fff}.teacher-banner .eyebrow{color:#aad7cf}.teacher-banner h2{font-size:25px;margin:8px 0 11px}.teacher-banner p:not(.eyebrow){font-size:14px;color:#c5dddf}.teacher-banner>.button{margin-left:auto;flex-shrink:0}.teacher-mark{width:76px;height:76px;border:1px solid #9abdbc66;border-radius:50%;display:grid;place-items:center;flex-shrink:0}.teacher-mark .icon{width:34px;height:34px}.promise-section{text-align:center;padding:67px 0 72px}.promise-section h2{font-size:22px;margin:12px 0 18px}.promise-section>p:not(.eyebrow){font-size:14px;line-height:2;color:var(--muted)}.promise-section .text-link{margin-top:21px}.site-footer{background:#edf2ef;border-top:1px solid var(--line)}.footer-main{display:flex;justify-content:space-between;padding-top:46px;padding-bottom:40px;gap:40px}.footer-main .brand>span{font-size:23px}.footer-main .brand>.icon{width:33px}.footer-main p{font-size:12px;color:var(--muted);margin-top:18px}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 60px;font-size:13px;align-content:start}.footer-links a:hover{text-decoration:underline}.footer-bottom{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);border-top:1px solid #d4ded8;padding-block:19px}.breadcrumb{display:flex;gap:12px;align-items:center;font-size:12px;color:var(--muted);padding-top:26px;flex-wrap:wrap}.breadcrumb a:hover{text-decoration:underline}.empty-page{padding-block:100px;min-height:55vh}.empty-page h1{font-size:36px;margin:20px 0}.empty-page .button{margin-top:25px}
/* 既存の画面幅に応じた表示切り替え */
@media(min-width:1500px){.hero{padding-top:66px;padding-bottom:72px}.hero-visual{height:570px}}
@media(max-width:1100px){.container{width:calc(100% - 64px)}.header-inner{width:calc(100% - 48px)}.main-nav{gap:20px;font-size:13px}.hero{gap:30px}.hero-visual{height:490px}.topic-grid{grid-template-columns:repeat(2,1fr)}.topic-item:nth-child(3){border-left:0;padding-left:0;border-top:1px solid var(--line)}.topic-item:nth-child(4){border-top:1px solid var(--line)}.topic-item h3{font-size:17px}.topic-item p{font-size:12px}.feature-grid{gap:32px}.feature-copy h2{font-size:26px}.teacher-banner{padding:32px;gap:22px}.teacher-mark{display:none}.teacher-banner h2{font-size:23px}.article-grid{gap:18px}.card-body{padding:19px}}
@media(max-width:760px){html{scroll-padding-top:20px}.container{width:calc(100% - 40px)}.site-header{height:76px}.header-inner{width:calc(100% - 40px)}.brand>span{font-size:23px}.brand>.icon{width:35px;height:35px}.brand small{font-size:9px}.menu-toggle{display:block;border:0;background:transparent;padding:10px;color:var(--ink)}.main-nav{display:none;position:absolute;top:76px;left:0;right:0;background:var(--paper);z-index:20;border-bottom:1px solid var(--line);padding:22px;box-shadow:0 10px 18px #073f5010}.main-nav.is-open{display:flex;align-items:stretch;flex-direction:column;gap:10px}.main-nav>a{font-size:15px}.nav-check{justify-content:center}.hero{grid-template-columns:1fr;gap:30px;padding-top:32px;padding-bottom:36px}.hero h1{font-size:43px;line-height:1.5;margin:19px 0}.hero-lead{font-size:15px;margin-bottom:22px}.hero-visual{height:340px;border-radius:75px 12px 12px 12px}.hero-stamp{width:151px;height:151px;bottom:49px;left:21px}.hero-stamp strong{font-size:16px}.hero-stamp>span{font-size:11px;margin-bottom:5px}.hero-stamp>.icon{width:25px;margin-top:6px}.hero-note{margin-top:12px}.section-heading{align-items:flex-start;flex-direction:column;gap:12px;margin-bottom:23px}h2{font-size:24px}.eyebrow{font-size:10px}.topic-section{padding-top:16px;padding-bottom:39px}.topic-item{gap:10px;padding:22px 10px 22px 0}.topic-item+.topic-item{padding-left:12px}.topic-item:nth-child(3){padding-left:0}.topic-item h3{font-size:14px}.topic-item p{font-size:10px;white-space:normal}.topic-icon{width:35px;height:35px}.topic-icon .icon{width:20px;height:20px}.topic-item>.icon{display:none}.feature-section{padding:35px 0}.feature-grid{grid-template-columns:1fr;gap:25px}.feature-diagram{padding:15px;order:2}.feature-copy h2{font-size:26px;margin:12px 0 16px}.feature-copy>p:not(.eyebrow){margin-bottom:22px}.diagram-controls{gap:10px}.diagram-controls>span{font-size:11px}.learning-section{padding:42px 0}.article-grid{grid-template-columns:1fr;gap:22px}.article-card{display:grid;grid-template-columns:140px 1fr}.card-visual{padding:7px;display:flex;align-items:center}.card-body{padding:18px 14px}.card-body h3{font-size:15px;min-height:0}.card-meta{font-size:10px;gap:7px;margin-bottom:8px}.card-link{font-size:11px;margin-top:10px}.teacher-banner{flex-direction:column;align-items:flex-start;padding:27px;gap:20px}.teacher-banner>.button{margin-left:0}.teacher-banner h2{font-size:21px}.promise-section{padding:43px 0}.promise-section h2{font-size:21px}.promise-section>p:not(.eyebrow){font-size:13px}.promise-section br{display:none}.footer-main{flex-direction:column;gap:25px;padding-block:32px}.footer-links{font-size:12px;gap:13px 22px}.footer-bottom{flex-direction:column;gap:6px;font-size:10px}.breadcrumb{font-size:11px;padding-top:19px;gap:7px}.button{font-size:14px}.empty-page h1{font-size:27px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}