@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap');
:root{--bg:#F7FAFC;--teal:#288F99;--yellow:#EBC052;--ink:#203d48;--muted:#667d85;--line:#dce7eb;--soft:#eaf4f4}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans JP',sans-serif;font-size:15px;line-height:1.9;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}a,button,input{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #288F99;outline-offset:5px}button,a{touch-action:manipulation}button{cursor:pointer}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.55}h1{letter-spacing:.025em}h1:focus{outline:none}.preview-bar{text-align:center;background:#e9f0f2;color:#536d77;font-size:11px;padding:6px 16px;letter-spacing:.04em}.preview-bar span{margin-left:14px}.site-header{max-width:1120px;margin:auto;padding:26px 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h2{font-size:18px}.list-heading h2 span{display:inline-block;font-size:9px;color:var(--muted);letter-spacing:.1em;margin-left:16px}.list-heading .text-link{font-size:10px;color:var(--muted)}.lesson-list{display:grid;gap:15px}.lesson-card{border:1px solid var(--line);border-radius:10px;padding:14px;display:flex;align-items:center;gap:26px;background:white;transition:border-color .15s}.lesson-card:hover{border-color:var(--teal)}.lesson-thumb{position:relative;flex:0 0 174px;aspect-ratio:16/10;border-radius:6px;background:radial-gradient(ellipse at 80% 80%,#add6d5,transparent 70%),linear-gradient(130deg,#d6e8e8,#eaf4f2);display:flex;align-items:center;justify-content:center;overflow:hidden}.lesson-thumb:before,.lesson-thumb:after{content:'';position:absolute;width:140px;height:140px;border:1px solid #288f9926;border-radius:50%;left:60px;top:10px}.lesson-thumb:after{width:100px;height:100px;left:80px;top:30px}.thumb-part{position:absolute;top:10px;left:12px;font-size:8px;letter-spacing:.12em;color:#46777b}.thumb-number{position:absolute;bottom:-20px;right:6px;font-size:78px;font-family:Georgia,serif;color:#288f991a}.play{display:grid;place-items:center;z-index:1;width:38px;height:38px;background:#ffffffe6;border-radius:50%;font-size:12px;color:var(--teal);padding-left:3px;box-shadow:0 2px 14px #288f9914}.lesson-info{flex:1}.lesson-info .eyebrow{font-size:9px}.lesson-info h3{font-size:20px;margin:4px 0}.lesson-info h3 small{font-size:14px;margin-left:6px;font-weight:500}.lesson-info>p:not(.eyebrow){font-size:12px;color:var(--muted)}.lesson-tag{font-size:9px;color:#748a92;display:inline-block;margin-top:8px}.lesson-arrow{padding:0 17px;color:var(--teal);font-size:24px}.learning-note{display:flex;align-items:center;justify-content:center;gap:16px;margin:34px 0 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18px}.login-panel>p:not(.eyebrow){font-size:12px;color:var(--muted)}form{margin-top:26px}label{display:block;font-size:11px;font-weight:600;margin-bottom:9px}.password-field{display:flex;border:1px solid #cbdde1;border-radius:6px;overflow:hidden;background:var(--bg)}input{width:100%;min-width:0;padding:13px 12px;border:0;background:transparent;font-size:13px;color:var(--ink)}.password-field button{border:0;background:none;color:var(--teal);font-size:11px;padding:0 15px;min-width:53px}.demo-note{font-size:10px;color:#846b27;background:#fbf7e8;padding:11px 13px;border-radius:5px;margin:14px 0}.button{display:flex;width:100%;align-items:center;justify-content:space-between;border:0;border-radius:6px;padding:14px 18px;font-size:12px;font-weight:600;min-height:48px}.primary{background:var(--yellow);color:var(--ink)}.primary:hover{background:#e3b744}.login-panel .helper{font-size:10px!important;margin-top:16px}.lesson-title{padding:28px 0 30px;border-bottom:1px solid var(--line)}.lesson-title h1{font-size:32px;margin-top:12px}.lesson-title .eyebrow span{color:var(--muted);font-weight:400}.subtitle{font-size:17px;margin-top:3px}.lesson-description{color:var(--muted);font-size:13px;margin-top:14px}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 215px;gap:60px}.content-section{padding-top:34px}.content-section h2{font-size:18px;margin-bottom:16px}.content-section>p{font-size:13px;color:#536e78;line-height:2.1}.content-section .sample-label{font-size:10px;color:var(--muted);margin-top:12px}.content-heading{display:flex;justify-content:space-between;align-items:start}.content-heading>span{font-size:9px;color:var(--muted);letter-spacing:.1em}.video-placeholder{aspect-ratio:16/9;background:#e9f0f2;border:1px solid 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p{font-size:11px;color:#776c4c;margin-top:7px}.figure-placeholder{padding:30px;background:#edf3f4;border:1px dashed #c7dadd;border-radius:8px;display:flex;align-items:center;justify-content:center;gap:20px;color:var(--muted)}.figure-placeholder>span{font-size:38px}.figure-placeholder p{font-size:12px}.figure-placeholder small{display:block;font-size:10px}.lesson-sidebar{position:sticky;top:30px;align-self:start;margin-top:38px;padding:22px 0 0 22px;border-left:1px solid var(--line)}.lesson-sidebar a{display:block;font-size:11px;margin-top:18px;color:var(--muted)}.sidebar-note{margin-top:35px;font-size:11px;color:#8a9ca2;line-height:2}.detail-bottom{margin-top:40px;padding-top:24px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px}.next-lesson{font-size:12px;text-align:right}.next-lesson small{display:block;font-size:8px;color:var(--teal);letter-spacing:.1em}.not-found{padding-top:70px;padding-bottom:80px}.not-found h1{font-size:26px;margin:15px 0}
@media(min-width:1400px){.hero{margin-top:25px}}
@media(max-width:760px){.site-header{padding:21px 22px}.header-label{font-size:9px}.brand{font-size:10px;gap:10px}.brand small{font-size:8px}.brand-mark{font-size:33px}.preview-bar{font-size:9px;padding:5px 10px}.preview-bar span{margin-left:7px}.hero{margin:5px 16px 0;padding:35px 25px 38px;grid-template-columns:1fr;border-radius:8px 8px 45px 8px;min-height:355px}.hero-copy{z-index:2}.hero>.anatomy{position:absolute;right:-44px;top:45px;width:200px;height:310px;opacity:.28}.hero .anatomy svg{width:220px;height:300px}.hero .art-caption{display:none}.hero h1{font-size:28px;line-height:1.8}.hero-kicker{font-size:11px;margin-top:23px}.hero .eyebrow{font-size:9px}.lead{font-size:11px;margin-top:18px;max-width:270px}.hero .text-link{font-size:11px}.course-section{margin-top:37px;padding:0 22px}.section-heading{display:block;margin-bottom:18px}.section-heading h2{font-size:20px}.section-note{display:block;font-size:10px;margin-top:9px}.eyebrow{font-size:10px}.course-grid{grid-template-columns:1fr;gap:16px}.course-card{grid-template-columns:34% 1fr}.course-art{min-height:185px}.course-body{padding:22px 19px 17px}.course-body h3{font-size:17px;margin:6px 0 8px}.course-body p{font-size:11px}.course-body .eyebrow{font-size:9px}.card-bottom{margin-top:14px}.course-art .anatomy svg{width:150px;height:215px;top:1px}.round-arrow{width:29px;height:29px}.course-footnote{font-size:10px;text-align:left;margin-top:20px;line-height:2}.course-footnote span{font-size:9px}footer{margin:45px 22px 0;padding:23px 0 28px;display:block;font-size:8px}footer small{display:block;font-size:9px;margin-top:6px}.page-shell{padding:7px 22px 0}.back{font-size:11px}.course-banner{padding:27px 23px;margin-top:14px;grid-template-columns:minmax(0,1fr);min-height:202px;position:relative;border-radius:8px 8px 40px 8px}.course-banner>div:first-child{z-index:1}.course-banner h1{font-size:24px}.course-banner p:not(.eyebrow){font-size:11px;max-width:250px}.course-banner>.anatomy{position:absolute;width:150px;right:-30px;opacity:.25;height:190px}.course-banner svg{height:230px}.list-heading{margin:28px 0 17px;gap:8px}.list-heading h2{font-size:16px}.list-heading h2 span{font-size:8px;margin-left:8px}.list-heading .text-link{font-size:9px}.lesson-card{padding:10px;gap:14px;position:relative}.lesson-thumb{flex-basis:95px;aspect-ratio:1/1.07}.thumb-part{font-size:6px;left:7px;top:8px}.thumb-number{font-size:60px;bottom:-18px}.play{width:31px;height:31px;font-size:10px}.lesson-info h3{font-size:16px;margin:4px 0 5px;line-height:1.5}.lesson-info h3 small{display:block;font-size:11px;margin-left:0}.lesson-info>p:not(.eyebrow){font-size:10px;line-height:1.7}.lesson-info .eyebrow{font-size:8px}.lesson-tag{font-size:8px;margin-top:7px}.lesson-arrow{font-size:18px;padding:0 2px}.learning-note{margin-top:26px;gap:10px}.learning-note p{font-size:11px}.learning-note small{font-size:9px}.inline-notice{font-size:10px}.login-layout{grid-template-columns:1fr;margin-top:15px}.login-visual{padding:26px 25px;overflow:hidden}.login-visual .anatomy{position:absolute;right:-30px;top:-40px;width:180px;height:240px;opacity:.3}.login-visual .anatomy svg{height:235px}.login-visual>p,.login-visual h1{position:relative;z-index:1}.login-visual h1{font-size:23px;margin-bottom:10px}.login-visual>p:last-child{font-size:11px;max-width:230px}.login-panel{padding:28px 25px 32px}.lock-icon{font-size:25px;margin-bottom:13px}.login-panel h2{font-size:23px}.login-panel>p:not(.eyebrow){font-size:11px}form{margin-top:22px}.detail-layout{grid-template-columns:minmax(0,1fr);gap:0}.lesson-sidebar{display:none}.lesson-title{padding:22px 0 24px}.lesson-title h1{font-size:26px}.subtitle{font-size:15px}.lesson-description{font-size:11px}.lesson-title .eyebrow{font-size:9px}.content-section{padding-top:28px}.content-section h2{font-size:17px;margin-bottom:14px}.content-section>p{font-size:12px}.point-list h3{font-size:12px}.point-list p{font-size:10px}.point-list li{gap:14px}.figure-placeholder{padding:24px 15px;gap:12px}.figure-placeholder p{font-size:10px}.figure-placeholder small{font-size:9px}.detail-bottom{align-items:start}.next-lesson{font-size:10px;max-width:50%}.detail-bottom .back{font-size:10px;min-height:35px}.video-placeholder strong{font-size:11px}.video-symbol{font-size:32px}.video-placeholder small{font-size:9px}.video-caption{font-size:9px!important}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media(min-width:761px) and (max-width:1000px){.hero{padding:44px 40px;grid-template-columns:1.8fr 1fr}.hero h1{font-size:29px}.course-body{padding:23px 18px}.course-body h3{font-size:17px}}
@media(max-width:760px){.hero h1{font-size:clamp(20px,5.9vw,26px)}}

.brand-logo{display:block;width:48px;height:48px;object-fit:contain;flex-shrink:0}@media(max-width:760px){.brand-logo{width:40px;height:40px}}
.login-message{font-size:11px;color:#a34235;line-height:1.9;margin:12px 0}.login-message:empty{display:none}.logout-form{margin:0}.logout-button{border:0;background:none;color:var(--muted);font-size:11px;padding:10px 0;min-height:44px}.logout-button:hover{color:var(--teal)}.lesson-actions{display:flex;justify-content:flex-end;margin-top:-38px;margin-bottom:3px}