:root{color-scheme:light;--accent:#e8590b;--text:#333;--line:#e5e5e5}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:#fdfdfd;color:var(--text);font-family:Arial,'Noto Sans JP','Meiryo',sans-serif;font-size:16px;line-height:1.8}a{color:#a64008;text-underline-offset:3px}img{max-width:100%;height:auto}button,input{font:inherit}button,a,input{touch-action:manipulation}button,a:focus-visible,input:focus-visible{outline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #1e719c}button{cursor:pointer}.site-header{max-width:1280px;margin:0 auto;min-height:148px;padding:35px 24px 24px;display:flex;flex-direction:column;align-items:center;gap:18px}.site-header>a img{display:block;width:340px;height:auto}.site-header nav{display:flex;gap:30px;justify-content:center;align-items:center;font-size:14px}.site-header nav a{text-decoration:none;color:#555}.site-header form{margin:0}.text-button{border:0;background:none;color:#555;padding:0}.site-header a:hover,.text-button:hover{color:var(--accent)}.menu-toggle{display:none}main{max-width:1040px;margin:0 auto;padding:32px 24px 56px;min-height:calc(100vh - 350px)}main.wide{max-width:1280px}.video-grid{list-style:none;padding:0;margin:12px 0 32px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:42px 18px}.video-card{display:block;text-decoration:none;color:#444}.video-card img{display:block;width:100%;aspect-ratio:1024/538;object-fit:cover;border-radius:10px}.video-card h2{font-size:16px;line-height:1.8;margin:14px 0 0;font-weight:700}.video-card:hover h2{text-decoration:underline}.site-footer{padding:28px 24px 16px;text-align:center;border-top:1px solid var(--line);background:#fff}.site-footer nav{display:flex;justify-content:center;flex-wrap:wrap;gap:12px 26px;font-size:13px}.site-footer p{font-size:13px;margin:20px 0 4px}.auth-panel{max-width:680px;margin:0 auto;padding:12px 0 36px}.auth-panel h1{font-size:26px;line-height:1.6;margin:28px 0}.member-notice{margin:0 0 32px}.auth-panel form{display:flex;flex-direction:column;gap:12px}.auth-panel label{font-size:16px;margin-top:8px}.auth-panel input:not([type=checkbox]){width:100%;min-height:48px;border:1px solid #aaa;background:#fff;color:#222;border-radius:3px;padding:10px 12px}.auth-panel .checkbox{display:flex;gap:10px;align-items:center;margin:12px 0}.checkbox input{width:20px;height:20px;accent-color:var(--accent)}.auth-panel button[type=submit]{align-self:flex-start;background:var(--accent);border:1px solid var(--accent);color:#fff;padding:11px 32px;min-height:48px;border-radius:3px;font-weight:700}.auth-panel .form-note{font-size:14px;margin:0}.preview-notice,.success,.error{padding:16px;margin:20px 0;line-height:1.8;overflow-wrap:anywhere}.preview-notice{background:#fff5e5;border-left:4px solid #e6a64f}.success{background:#eef8f0;border-left:4px solid #398b55}.error{background:#fff0ef;border-left:4px solid #ba3434}.registration-link{margin-top:26px}.post-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px}.post-layout article{min-width:0}.post-layout h1{font-size:25px;line-height:1.6;margin:0 0 34px;overflow-wrap:anywhere}.post-thumbnail{display:block;width:100%;margin:0 0 36px;border-radius:4px}.topics{margin:24px 0 54px;background:#fff;box-shadow:0 2px 5px #0002}.topics h2{margin:0;padding:8px 16px;text-align:center;color:#fff;background:var(--accent);font-size:17px}.topics ol{list-style:none;counter-reset:topic;margin:0;padding:24px 28px}.topics li{counter-increment:topic;position:relative;padding-left:34px;line-height:1.8;margin:8px 0;overflow-wrap:anywhere}.topics li:before{content:counter(topic);position:absolute;left:0;top:1px;width:24px;height:24px;text-align:center;border-radius:50%;color:#fff;background:var(--accent);font-size:14px;line-height:24px}.section-title{font-size:23px;border-left:5px solid #d8a448;padding:8px 16px;margin:34px 0 24px;line-height:1.6}.video-frame{display:block;border:0;width:100%;aspect-ratio:16/9;background:#111}.date-box{margin:0 0 38px;border:1px solid #dd7b43;padding:18px;text-align:center;font-size:14px}.post-layout aside nav{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}.post-layout aside a{display:flex;min-height:90px;align-items:center;justify-content:center;text-decoration:none;color:var(--accent);font-size:15px;border-right:1px solid var(--line)}.lesson-nav{display:flex;gap:20px;justify-content:space-between;margin:28px 0;font-size:14px}.lesson-nav>*{flex:1;min-width:0}.lesson-nav>a:last-child{text-align:right}.message-panel{padding:48px 0}.legal{font-size:16px;line-height:1.9;overflow-wrap:anywhere}.legal h1{font-size:30px;line-height:1.6;margin:0 0 30px}.legal h2{font-size:23px;line-height:1.6;margin:32px 0 18px}.legal p{margin:0 0 16px}.legal .legal-table-wrap{overflow-x:auto;max-width:100%;margin:20px 0}.legal table{border-collapse:collapse;min-width:560px;width:100%;font-size:15px}.legal td,.legal th{border:1px solid #ccc;padding:12px;text-align:left;vertical-align:top}.legal th{background:#fff5e5}.legal-review-note{padding:16px;background:#fff5e5;border-left:4px solid #e6a64f;margin:24px 0}.visually-hidden{position:absolute;clip-path:inset(50%);width:1px;height:1px;overflow:hidden;white-space:nowrap}
@media(max-width:959px){.post-layout{grid-template-columns:minmax(0,1fr);gap:32px}.post-layout aside{border-top:1px solid var(--line);padding-top:24px}.post-layout aside nav{max-width:400px;margin:auto}.date-box{margin:0 auto 24px;max-width:400px}.video-grid{gap:30px 18px}.video-card h2{font-size:15px}}
@media(max-width:767px){html,body{font-size:15px}.site-header{min-height:110px;padding:24px 66px 20px 18px;position:relative;align-items:flex-start;justify-content:center}.site-header>a img{width:260px}.menu-toggle{display:flex;position:absolute;right:18px;top:34px;width:42px;height:42px;flex-direction:column;justify-content:center;align-items:center;gap:5px;border:1px solid #c9611f;background:#fff;border-radius:3px}.menu-toggle span{width:22px;height:2px;background:var(--accent)}.site-header nav{display:none}.site-header nav.is-open{position:absolute;top:100%;left:0;right:0;z-index:10;display:flex;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid #ddd;box-shadow:0 4px 6px #0001;align-items:stretch}.site-header nav a,.site-header nav form{padding:16px 24px;border-top:1px solid #eee}.site-header nav button{padding:0}.site-header nav a{font-size:16px}main,main.wide{padding:22px 20px 36px}.video-grid{grid-template-columns:minmax(0,1fr);gap:32px;margin-top:4px}.video-card h2{font-size:16px;margin-top:12px}.site-footer nav{flex-direction:column;gap:10px}.auth-panel{padding:0 0 20px}.auth-panel h1{font-size:23px}.post-layout h1{font-size:23px;margin-bottom:24px}.post-thumbnail{margin-bottom:26px}.topics{margin-bottom:32px}.topics ol{padding:18px}.topics li{font-size:15px}.lesson-nav{flex-direction:column;gap:12px}.lesson-nav>a:last-child{text-align:left}.legal{font-size:15px}.legal h1{font-size:24px}.legal h2{font-size:20px}}