@font-face{font-family:MM;src:url('/assets/mm.ttf')}@font-face{font-family:JP;src:url('/assets/jp.ttf')}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:#162847;background:#fff;font:16px/1.85 MM,JP,sans-serif}a{color:inherit}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #4775c0;outline-offset:4px}.top{border-bottom:1px solid #dce3ec;background:white}.top-inner{max-width:1200px;margin:auto;padding:14px 24px;display:flex;align-items:center;gap:24px}.site-logo img{display:block;width:164px;height:auto}.nav{display:flex;align-items:center;gap:10px;margin-left:auto}.nav>a{text-decoration:none;white-space:nowrap;font-size:14px;padding:8px}.nav>a:hover{color:#bb2639}.welcome-shell{max-width:1120px;margin:auto;padding:0 24px}section{padding:52px 0;scroll-margin-top:20px}h1,h2,h3{line-height:1.65}h2{font-size:28px;margin:0 0 18px}h3{font-size:21px}p{margin:0 0 16px}.eyebrow{color:#b52133;font:700 12px JP,sans-serif;letter-spacing:.1em;margin-bottom:14px}.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:35px;align-items:center}.hero h1{font-size:clamp(32px,4vw,49px);margin:0 0 18px}.hero-cat{width:100%;height:auto;max-height:430px;object-fit:contain}.japanese{font-weight:700}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.primary,.secondary{display:inline-block;border:1px solid #bd2638;border-radius:6px;padding:11px 17px;text-decoration:none;cursor:pointer}.primary{background:#bd2638;color:#fff}.secondary{background:white;color:#162847;border-color:#9ca8b8}.primary:disabled{opacity:.6;cursor:wait}.purpose{border-top:1px solid #dce3ec;border-bottom:1px solid #dce3ec;max-width:880px}.purpose p:not(.eyebrow){max-width:810px}.sample-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.sample-card{padding:0;text-align:left;background:#fff;color:#162847;border:1px solid #dce3ec;border-radius:10px;overflow:hidden;cursor:pointer}.sample-card[aria-expanded=true]{border-color:#bd2638}.sample-card:hover{border-color:#bd2638}.sample-card svg{display:block;width:100%;height:150px;background:#f6f8fb}.sample-copy{padding:18px}.sample-copy h3{margin:0 0 6px}.sample-copy p{font-size:14px;margin:0 0 12px}.sample-copy span{font-size:14px;color:#b52133}.sample-detail{margin-top:24px;padding:26px;border-left:4px solid #bd2638;background:#f6f8fb}.sample-detail h3{margin-top:0}.sample-detail button,.quiz-next{border:1px solid #99a5b5;border-radius:6px;padding:8px 14px;background:white;cursor:pointer}.practice{border-top:1px solid #dce3ec}.quiz-card{max-width:800px;padding:26px;background:#f6f8fb;border:1px solid #dce3ec;border-radius:10px}.quiz-options{display:grid;gap:10px;margin:20px 0}.quiz-options button{background:white;color:#162847;text-align:left;border:1px solid #b7c1cf;padding:12px;border-radius:6px;cursor:pointer}.quiz-options button.correct{border-color:#167451;background:#edf8f1}.quiz-options button.wrong{border-color:#b52133;background:#fff0f2}.quiz-feedback{border-left:3px solid #167451;padding:14px;margin-bottom:18px;background:#fff}.course-info{display:grid;grid-template-columns:1fr 1fr;gap:50px;border-top:1px solid #dce3ec}.course-info form{padding:26px;background:#f6f8fb;border-radius:10px}.course-info label{display:block;margin:12px 0 5px}.course-info input[type=email],.course-info select{width:100%;border:1px solid #96a4b8;border-radius:6px;padding:11px;background:white;color:#162847}.consent{display:flex!important;gap:10px;align-items:flex-start;font-size:14px}.consent input{margin-top:7px;width:18px;height:18px;flex-shrink:0}.course-info small{display:block;font-size:13px;color:#53637b;margin:14px 0}.course-info button{width:100%}.honeypot{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.error{color:#a2162b}footer{border-top:1px solid #dce3ec;text-align:center;color:#627089;font-size:14px;padding:24px}footer small{font-size:12px}[hidden]{display:none!important}@media(max-width:760px){.hero{grid-template-columns:1fr;gap:16px;padding-top:35px}.hero-cat{max-height:280px}.welcome-shell{padding:0 18px}section{padding:35px 0}h2{font-size:24px}.sample-grid{grid-template-columns:repeat(2,1fr);gap:12px}.sample-copy{padding:12px}.sample-copy h3{font-size:18px}.course-info{grid-template-columns:1fr;gap:18px}.nav>a{padding:6px;font-size:13px}.quiz-card{padding:18px}}@media(max-width:380px){.sample-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(max-width:760px){.top .nav>a[href="#purpose"]{display:none}}

/* Course selection sits beside the introduction; chapter styling stays independent. */
.course-overview{display:grid;grid-template-columns:265px minmax(0,1fr);gap:28px;align-items:start;margin:30px 0 38px}
.course-sidebar{border:1px solid #d8e1ea;border-radius:12px;background:#f8fafc;padding:18px;position:sticky;top:20px}
.course-sidebar h2{font-size:19px;margin:0 0 16px;line-height:1.8}.course-sidebar .eyebrow{margin:0 0 5px}
.course-menu{display:flex;flex-direction:column;gap:9px}.course-menu-button{display:block;width:100%;text-align:left;text-decoration:none;white-space:normal;border:1px solid #d4dfe8;border-radius:8px;background:#fff;color:#203c5c;padding:13px 14px;font:14px/1.9 MM,JP,sans-serif}
.course-menu-button span,.course-menu-button strong,.course-menu-button small{display:block}.course-menu-button strong{font-size:15px}.course-menu-button small{font-size:11px;line-height:1.9;margin-top:4px}
.course-menu-button.current-course{background:#506579;color:#fff;border-color:#506579}.course-menu-button.current-course:hover{background:#43596d}
.course-menu-button.upcoming-course:disabled{opacity:1;color:#667689;background:#f1f4f7;cursor:default}.course-menu-button.upcoming-course span{font-size:12px}
.course-sidebar-note{font-size:12px;line-height:1.9;margin:17px 0 0;color:#536479}
.course-selected{min-width:0}.course-selected .course-feature{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);padding:24px;gap:18px}.course-selected .course-copy h2{font-size:27px}
.course-overview .hero{padding:20px 0 32px;grid-template-columns:minmax(0,1.3fr) minmax(0,.8fr);gap:18px}.course-overview .hero h1{font-size:clamp(23px,3vw,33px);line-height:1.9;margin-bottom:16px}
.course-overview .hero-cat{max-height:270px}.course-overview .hero-actions{gap:8px;margin-top:18px}.course-overview .hero-actions a{font-size:14px;padding:10px 13px}
.course-overview #samples{padding:26px 0 10px;border-top:1px solid #d8e1ea}.course-overview #samples h2{font-size:23px;margin-bottom:12px}
.course-overview .sample-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.course-overview .sample-copy{padding:13px}.course-overview .sample-copy h3{font-size:18px}.course-overview .sample-copy p{font-size:13px}.course-overview .sample-card svg{height:125px}
.sample-more{display:inline-block;margin-top:18px;padding:10px 16px;border:1px solid #9aaabd;border-radius:6px;background:#fff;color:#203c5c;font:14px/1.9 MM,JP,sans-serif;cursor:pointer}.sample-more[hidden]{display:none}
.course-overview ruby{ruby-position:over}.course-overview rt{font-size:.5em;font-weight:400}
@media(max-width:900px){.course-overview{grid-template-columns:220px minmax(0,1fr);gap:20px}.course-overview .hero{grid-template-columns:1fr}.course-overview .hero-cat{display:none}.course-overview .sample-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.course-selected .course-feature{grid-template-columns:1fr}.course-sidebar{padding:14px}}
@media(max-width:680px){.course-overview{grid-template-columns:1fr;gap:20px;margin-top:22px}.course-sidebar{position:static}.course-menu{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.course-menu-button.current-course{grid-column:1/-1}.course-menu-button{padding:10px 12px}.course-sidebar-note{margin-top:12px}.course-overview .hero{padding:8px 0 24px}.course-overview .hero-cat{display:block;max-height:190px;width:190px;justify-self:center;order:1}.course-overview .sample-grid{grid-template-columns:1fr}.course-overview .sample-card{display:grid;grid-template-columns:110px minmax(0,1fr)}.course-overview .sample-card svg{height:100%;min-height:140px}.course-overview .sample-copy{padding:12px}}

/* Aligned header and course rail: one page scroll, a bounded menu on short screens. */
:root{--mt-header-height:98px;--mt-page-bg:#f3f5f8;--mt-header-bg:#dce4ed}
body{background:var(--mt-page-bg)}
header.top{position:sticky;top:0;z-index:100;background:var(--mt-header-bg);border-bottom:1px solid #bccbd9}
header.top .top-inner{max-width:1200px;padding-top:12px;padding-bottom:12px}
header.top .navlink,header.top .nav>a{color:#203c5c}
header.top .navlink{background:transparent}
header.top .navlink.active{border-bottom-color:#b52133}
header.top .subbrand{color:#445970}
html{scroll-padding-top:calc(var(--mt-header-height) + 16px)}
.course-overview{gap:24px;margin-top:20px;align-items:start}
.course-sidebar{position:sticky;top:calc(var(--mt-header-height) + 12px);max-height:calc(100dvh - var(--mt-header-height) - 24px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;background:#fff;padding:16px;border-radius:10px}
.course-sidebar h2{margin-bottom:12px;font-size:18px}
.course-menu{gap:7px}
.course-menu-button{padding:10px 12px;line-height:1.6}
.course-menu-button.upcoming-course{display:grid;grid-template-columns:1fr auto;align-items:center;column-gap:6px}
.course-menu-button.upcoming-course small{grid-column:1/-1;margin-top:2px}
.course-menu-button.upcoming-course strong{font-size:14px}
.course-sidebar-note{margin-top:12px;font-size:11px}
.course-selected{padding:24px;background:#fff;border:1px solid #d8e1ea;border-radius:10px}
.course-overview .hero{padding:0 0 28px}
.course-overview .hero h1{margin-top:0}
.course-selected>section{scroll-margin-top:0}
.course-selected .purpose{max-width:none;margin-top:28px}
.course-selected .course-info{gap:24px;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr)}
.course-selected .course-info form{padding:18px}
@media(max-width:900px){.course-overview{gap:18px}.course-selected{padding:20px}.course-selected .course-info{grid-template-columns:1fr;gap:18px}}
@media(max-width:680px){.course-overview{margin-top:16px}.course-sidebar{position:static;max-height:none;overflow:visible}.course-selected{padding:18px}.course-menu-button.upcoming-course{display:block}.course-menu-button.upcoming-course small{display:none}.course-menu-button.upcoming-course span{margin-top:3px}.course-overview .hero{padding-top:0}.course-sidebar-note{margin-bottom:0}}
/* A clear technical identity, with restrained red accents and readable light surfaces. */
.welcome-shell{max-width:1200px}
.purpose-feature{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(240px,1fr);gap:40px;max-width:none;margin:24px 0 28px;padding:32px;background:#fff;border:1px solid #d8e1ea;border-top:4px solid #203c5c;border-radius:4px}
.purpose-feature .eyebrow{color:#b52133;letter-spacing:.16em;margin-bottom:12px}
.purpose-feature h2{font-size:clamp(24px,3vw,34px);line-height:1.8;margin-bottom:12px}
.purpose-feature .purpose-copy>p{font-size:16px;line-height:2;margin-bottom:16px}
.purpose-details summary{cursor:pointer;font-size:14px;color:#203c5c;font-weight:700;padding:8px 0}
.purpose-details p{margin:14px 0 0;font-size:15px;line-height:2}
.purpose-pillars{display:grid;gap:10px;align-content:center}
.purpose-pillars>div{display:grid;grid-template-columns:42px 1fr;column-gap:14px;padding:17px 20px;background:#f2f5f9;border-left:3px solid #b52133}
.pillar-number{grid-row:1/3;font:700 18px/1.8 JP,sans-serif;color:#8c9bad}
.purpose-pillars strong{font:700 23px/1.7 JP,sans-serif;color:#203c5c}
.purpose-pillars rt{font-size:.48em;font-weight:400}.purpose-pillars p{font-size:13px;margin:3px 0 0;color:#445970}
.course-sidebar{border-radius:4px;border-top:3px solid #203c5c}
.course-menu-button{border-radius:4px}
.course-menu-button.current-course{background:#203c5c;border-color:#203c5c;border-left:4px solid #b52133}
.course-menu-button.current-course:hover{background:#2c4968}
.course-selected{border-radius:4px;border-top:3px solid #b52133}
.course-overview .hero h1{color:#203c5c;font-weight:800;letter-spacing:.025em}
.course-overview .hero-cat{padding:18px;background:#f1f4f8;border-radius:4px;border-bottom:3px solid #203c5c}
.course-overview .sample-card{border-radius:4px;transition:transform .15s ease,border-color .15s ease}
.course-overview .sample-card:hover{transform:translateY(-3px);border-color:#203c5c}
.course-overview .sample-card svg{background:#edf2f7;height:145px}
.course-overview .sample-copy h3{font-weight:800;color:#203c5c}
.course-overview #samples{border-top:2px solid #d8e1ea}
.hero-actions .primary,.hero-actions .secondary,.sample-more{border-radius:4px}
@media(max-width:900px){.purpose-feature{gap:24px;padding:26px;grid-template-columns:minmax(0,1.5fr) minmax(200px,1fr)}.purpose-pillars>div{padding:14px;column-gap:8px}}
@media(max-width:680px){.purpose-feature{grid-template-columns:1fr;gap:18px;margin-top:16px;padding:20px}.purpose-pillars{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.purpose-pillars>div{display:block;padding:12px 9px;border-left:0;border-top:2px solid #b52133}.pillar-number{display:block;font-size:13px}.purpose-pillars strong{font-size:20px}.purpose-pillars p{font-size:11px;line-height:1.8}.purpose-feature h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){.course-overview .sample-card{transition:none}.course-overview .sample-card:hover{transform:none}}