:root{--navy:#07182f;--navy2:#0d2e57;--blue:#2577ff;--cyan:#70e2ec;--paper:#f1f6fc;--white:#fff;--ink:#10203a;--muted:#64748b;--line:#dbe5f0;--shadow:0 20px 60px rgba(9,35,70,.12)}
*{box-sizing:border-box}[hidden]{display:none!important}html{font-size:16px}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.7}button,input,textarea{font:inherit}button{cursor:pointer}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 75% 20%,rgba(37,119,255,.34),transparent 34%),linear-gradient(145deg,#07182f,#0a2b53)}.login-card{width:min(100%,460px);padding:42px;background:#fff;border:1px solid rgba(255,255,255,.25);border-radius:12px;box-shadow:0 30px 90px rgba(0,0,0,.35)}.course-mark{display:inline-grid;place-items:center;min-width:76px;height:40px;padding:0 14px;background:var(--blue);color:#fff;border-radius:8px;font-weight:900}.eyebrow{margin:22px 0 4px;color:#2466c1;font-size:.82rem;font-weight:900}.login-card h1{font-size:2.3rem;line-height:1.2;margin:.15em 0}.login-card p{color:var(--muted)}label{display:block;font-weight:800;margin:22px 0 6px}input,textarea{width:100%;border:1px solid #b9c8d9;border-radius:10px;padding:13px;background:#fff;color:var(--ink)}input:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:3px solid rgba(37,119,255,.28);outline-offset:2px}.login-card button,.chat-form button{width:100%;min-height:50px;margin-top:14px;border:0;border-radius:10px;background:var(--blue);color:#fff;font-weight:900}.error{min-height:1.5em;color:#b42318!important;font-weight:700}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px;padding:0 max(22px,calc((100vw - 1440px)/2));background:#fff;border-bottom:1px solid var(--line)}.logo{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none}.logo span{padding:6px 10px;border-radius:7px;background:var(--blue);color:#fff;font-size:.82rem;font-weight:950}.top-actions{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:.86rem;font-weight:800}.text-button{padding:7px 0;border:0;background:none;color:#315d94;font-weight:800}.progress-track{position:sticky;top:68px;z-index:20;height:4px;background:#e7edf5}.progress-track span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .25s ease}
.workspace{width:min(calc(100% - 36px),1440px);margin:36px auto;display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,460px);gap:28px;align-items:start}.learning-panel,.coach{background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.06)}.learning-panel{overflow:hidden}.welcome{padding:42px;background:radial-gradient(circle at 85% 20%,rgba(112,226,236,.16),transparent 32%),linear-gradient(135deg,var(--navy),var(--navy2));color:#fff}.welcome .eyebrow{color:#8ee8ef;margin-top:0}.welcome h1{margin:.1em 0 .3em;font-size:clamp(2.4rem,5vw,4.4rem);line-height:1.08;letter-spacing:-.045em}.welcome p:last-child{max-width:650px;color:#c8d8ea}.chapters{padding:20px}.chapter{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;padding:18px 16px;border-bottom:1px solid var(--line)}.chapter:last-child{border-bottom:0}.chapter input{appearance:none;width:25px;height:25px;margin:0;border:2px solid #97abc1;border-radius:7px;display:grid;place-items:center}.chapter input:checked{background:var(--blue);border-color:var(--blue)}.chapter input:checked:after{content:"✓";color:#fff;font-weight:950;line-height:1}.chapter:has(input:checked) h3{text-decoration:line-through;color:#7b8ba0}.chapter a{display:block;color:inherit;text-decoration:none}.chapter a:hover h3{color:var(--blue)}.chapter small{color:#2470d7;font-weight:900}.chapter h3{margin:0;font-size:1rem;line-height:1.45}.chapter a b{display:inline-block;margin-top:5px;color:#2568bd;font-size:.76rem}.chapter span{font-size:.78rem;color:var(--muted)}
.coach{position:sticky;top:94px;overflow:hidden}.coach-head{display:flex;align-items:center;gap:12px;padding:18px;border-bottom:1px solid var(--line)}.coach-avatar{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#174a9b);color:#fff;font-weight:950}.coach-head p,.coach-head h2{margin:0}.coach-head p{font-size:.73rem;color:var(--muted);font-weight:800}.coach-head h2{font-size:1.08rem}.status{margin-left:auto;padding:4px 8px;border-radius:6px;background:#e9f9f3;color:#087a52;font-size:.72rem;font-weight:900}.messages{height:min(43vh,500px);min-height:320px;overflow:auto;padding:18px;background:#f8fbff}.message{width:fit-content;max-width:90%;margin-bottom:12px;padding:12px 14px;border-radius:12px;white-space:pre-wrap}.message.assistant{background:#fff;border:1px solid var(--line);border-top-left-radius:3px}.message.user{margin-left:auto;background:var(--blue);color:#fff;border-top-right-radius:3px}.message.loading{color:var(--muted)}.quick-questions{display:flex;gap:7px;overflow:auto;padding:12px 16px 0}.quick-questions button{flex:0 0 auto;padding:7px 10px;border:1px solid #b8cef0;border-radius:7px;background:#fff;color:#255995;font-size:.76rem;font-weight:800}.chat-form{padding:14px 16px}.chat-form textarea{resize:none}.coach-note{margin:0;padding:0 16px 16px;color:var(--muted);font-size:.75rem}.coach-note a{color:#1e64bf;font-weight:800}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.coach{position:relative;top:auto}.messages{height:420px}.topbar{padding:0 16px}}
@media(max-width:540px){.login-shell{padding:8px}.login-card{padding:30px 20px}.topbar{min-height:64px}.logo b{display:none}.top-actions{gap:10px}.top-actions span{font-size:.74rem}.progress-track{top:64px}.workspace{width:calc(100% - 16px);margin:8px auto;gap:12px}.welcome{padding:30px 18px}.welcome h1{font-size:2.65rem}.chapters{padding:6px 12px}.chapter{grid-template-columns:auto 1fr;gap:12px;padding:15px 4px}.chapter>span{grid-column:2}.coach{border-radius:12px}.messages{height:360px}.quick-questions{padding-left:12px}.chat-form{padding:12px}.login-card h1{font-size:2rem}}
@media(prefers-reduced-motion:reduce){.progress-track span{transition:none}}
.course-loading{min-height:100vh;display:grid;place-items:center;color:var(--muted);font-weight:800}.lesson{padding:40px 48px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.06)}.lesson-content h2{margin:2.2em 0 .7em;padding-top:1.2em;border-top:1px solid var(--line);font-size:1.65rem;line-height:1.4}.lesson-content h3{margin:1.8em 0 .5em;font-size:1.25rem}.lesson-content p,.lesson-content li{color:#3e5068}.lesson-content li{margin:.55em 0}.lesson-content blockquote{margin:24px 0;padding:16px 20px;border-left:4px solid var(--blue);background:#eef5ff;color:#27496f}.lesson-content code{padding:.15em .35em;border-radius:4px;background:#eef2f7}.table-wrap{overflow:auto;margin:22px 0}.lesson-content table{width:100%;border-collapse:collapse;min-width:560px}.lesson-content th,.lesson-content td{padding:11px;border:1px solid var(--line);text-align:left}.lesson-content th{background:#eff5fc}.lesson-complete{margin-top:50px;padding:24px;background:#eef6ff;border:1px solid #c8dcf5;border-radius:12px}.lesson-complete button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border:0;border-radius:9px;background:var(--blue);color:#fff;font-weight:900}.lesson-complete button.done{background:#16805f}.lesson-nav{display:flex;justify-content:space-between;gap:16px;margin-top:34px}.lesson-nav a{color:#2866b1;font-weight:900;text-decoration:none}

/* 2026-09 learning experience refresh */
.welcome{position:relative;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(270px,.8fr);min-height:440px;padding:0;overflow:hidden;background:linear-gradient(125deg,#06162d 0%,#0a2b55 58%,#124d80 100%)}.welcome:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(112,226,236,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(112,226,236,.055) 1px,transparent 1px);background-size:48px 48px;pointer-events:none}.welcome-copy{position:relative;z-index:2;padding:52px 0 50px 48px}.welcome h1 em{color:#70e2ec;font-style:normal}.welcome-copy>p:last-of-type{font-size:1.02rem}.welcome-meta{display:flex;flex-wrap:wrap;gap:9px;margin:24px 0}.welcome-meta span{padding:6px 10px;border:1px solid rgba(143,209,241,.35);border-radius:7px;background:rgba(255,255,255,.065);font-size:.76rem;font-weight:800;color:#dbeafa}.primary-link{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 24px;border-radius:9px;background:#fff;color:#0b3260;text-decoration:none;font-weight:950;box-shadow:0 12px 30px rgba(0,0,0,.18)}.welcome-teacher{position:relative;min-height:440px;overflow:hidden}.welcome-teacher img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:25% center;mask-image:linear-gradient(90deg,transparent 0%,#000 28%)}.chapter{border-radius:10px;transition:background .18s ease,transform .18s ease}.chapter:hover{background:#f6f9fd;transform:translateY(-1px)}
.course-body{background:#eef3f9}.header-link{color:#285e9e;text-decoration:none;font-weight:900}.course-studio{width:min(calc(100% - 32px),1680px);margin:24px auto 60px;display:grid;grid-template-columns:260px minmax(0,860px) minmax(300px,380px);gap:22px;align-items:start}.curriculum,.course-coach{position:sticky;top:94px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.05);overflow:hidden}.curriculum-head{padding:20px;border-bottom:1px solid var(--line)}.curriculum-head small{display:block;color:#3572bc;font-size:.68rem;font-weight:950;letter-spacing:.12em}.curriculum-head strong{display:block;margin-top:4px}.curriculum nav{max-height:calc(100vh - 180px);overflow:auto;padding:8px}.curriculum-item{display:grid;grid-template-columns:32px 1fr;gap:10px;align-items:center;padding:10px;border-radius:8px;color:var(--ink);text-decoration:none}.curriculum-item>span{display:grid;place-items:center;width:30px;height:30px;border-radius:7px;background:#edf3fa;color:#5b6e86;font-size:.7rem;font-weight:950}.curriculum-item small,.curriculum-item strong{display:block}.curriculum-item small{color:#6b7d92;font-size:.64rem}.curriculum-item strong{font-size:.76rem;line-height:1.38}.curriculum-item.current{background:#eaf3ff}.curriculum-item.current>span{background:var(--blue);color:#fff}.curriculum-item.completed>span{background:#e5f7f0;color:#087a52}.course-studio .lesson{padding:30px 38px}.lesson-breadcrumb{display:flex;gap:8px;align-items:center;margin-bottom:22px;color:#73849a;font-size:.75rem;font-weight:800}.lesson-breadcrumb a{color:#2866b1;text-decoration:none}.video-lesson{margin-bottom:34px;padding:16px;border-radius:14px;background:#071a36;color:#fff;box-shadow:0 18px 50px rgba(7,24,47,.22)}.video-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:3px 4px 14px}.video-heading h2{margin:4px 0 0;font-size:1.05rem}.teacher-label{color:#70e2ec;font-size:.7rem;font-weight:950}.video-time{padding:5px 8px;border:1px solid rgba(255,255,255,.2);border-radius:6px;color:#cbdcf0;font-size:.7rem;font-weight:800}.video-lesson video{display:block;width:100%;aspect-ratio:16/9;border-radius:9px;background:#041226}.voice-credit{margin:10px 4px 0;color:#9db2cd;font-size:.68rem}.lesson-title-block{padding:12px 0 28px;border-bottom:1px solid var(--line)}.lesson-title-block .eyebrow{margin-top:0}.lesson-title-block h1{margin:.1em 0 .5em;font-size:clamp(2.2rem,4vw,3.55rem);line-height:1.16;letter-spacing:-.04em}.lesson-points{display:flex;flex-wrap:wrap;gap:8px}.lesson-points span{padding:5px 9px;border-radius:6px;background:#eef5ff;color:#275d9e;font-size:.72rem;font-weight:850}.course-studio .lesson-content{font-size:1.01rem}.lesson-complete{display:flex;align-items:center;justify-content:space-between;gap:20px}.lesson-complete small,.lesson-complete strong{display:block}.lesson-complete small{margin-bottom:5px;color:#2470d7;font-size:.66rem;font-weight:950;letter-spacing:.08em}.lesson-complete strong{max-width:430px}.lesson-complete button{flex:0 0 auto}.course-coach .messages.compact{height:min(43vh,440px);min-height:260px}.teacher-mini{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#dbeafe,#8ec5ef);color:#103968;font-size:.68rem;font-weight:950}.course-coach .chat-form button{width:100%;min-height:48px;margin-top:10px;border:0;border-radius:9px;background:var(--blue);color:#fff;font-weight:900}
.lesson-content .course-step-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:2.2em 0 .9em;padding:20px 0 14px;border-top:1px solid var(--line);border-bottom:1px solid transparent}.course-step-heading>span{min-width:0}.step-check{flex:0 0 auto;min-height:42px;padding:0 15px;border:1px solid #9ebce2;border-radius:9px;background:#fff;color:#235d9f;font-size:.78rem;font-weight:950}.step-check:hover{background:#edf5ff}.course-step-heading.step-current{margin-top:2.5em;padding:22px 20px;border:1px solid #b8d2f2;border-radius:12px;background:#f2f7ff;box-shadow:0 10px 28px rgba(37,119,255,.08)}.course-step-heading.step-current:before{content:"今ここ";flex:0 0 auto;padding:4px 7px;border-radius:5px;background:var(--blue);color:#fff;font-size:.65rem;font-weight:950}.course-step-heading.step-done{margin:12px 0;padding:13px 16px;border:1px solid #cae7dc;border-radius:10px;background:#f2fbf7;color:#315d50;cursor:pointer}.course-step-heading.step-done>span{font-size:1rem}.step-check.checked{border-color:#99d2bb;background:#e4f6ee;color:#087a52}.lesson-complete button:disabled{cursor:not-allowed;background:#a9b6c7;color:#edf2f7;box-shadow:none}
@media(max-width:1250px){.course-studio{grid-template-columns:220px minmax(0,1fr)}.course-coach{grid-column:2;position:static}.course-coach .messages.compact{height:320px}.curriculum{grid-row:1/3}}
@media(max-width:900px){.welcome{grid-template-columns:1fr;min-height:520px}.welcome-copy{padding:42px 32px 250px}.welcome-teacher{position:absolute;inset:auto 0 0;height:280px;min-height:0}.welcome-teacher img{object-position:35% 34%;mask-image:linear-gradient(180deg,transparent 0%,#000 45%)}.course-studio{grid-template-columns:1fr;width:min(calc(100% - 20px),860px);margin-top:10px}.curriculum{position:static;grid-row:auto}.curriculum nav{display:flex;gap:6px;overflow:auto;padding:10px;max-height:none}.curriculum-item{flex:0 0 190px}.course-coach{grid-column:auto}.course-studio .lesson{padding:28px 24px}}
@media(max-width:540px){.welcome-copy{padding:30px 18px 230px}.welcome{min-height:540px}.welcome-meta{margin:18px 0}.primary-link{width:100%}.course-studio{width:calc(100% - 12px);gap:10px}.curriculum-head{padding:14px}.course-studio .lesson{padding:20px 15px}.video-lesson{margin:0 -5px 26px;padding:8px}.video-heading{align-items:flex-end}.video-heading h2{font-size:.88rem}.lesson-title-block h1{font-size:2.1rem}.lesson-points{gap:5px}.lesson-complete{align-items:stretch;flex-direction:column}.lesson-complete button{width:100%}.course-coach .messages.compact{height:300px}.lesson-content .course-step-heading{align-items:flex-start;flex-wrap:wrap;padding:17px 14px}.course-step-heading.step-current:before{order:-1}.course-step-heading>span{flex:1 1 calc(100% - 80px);font-size:1.18rem}.step-check{width:100%}}
.deepening{margin:44px 0 8px;padding:26px;border:1px solid #a9c9ed;border-radius:18px;background:linear-gradient(145deg,#f7fbff,#eaf3ff);box-shadow:0 14px 34px rgba(16,57,99,.08)}.deepening-kicker{margin:0!important;color:#1976d2!important;font-size:.72rem!important;font-weight:950;letter-spacing:.12em}.deepening h2{margin:4px 0 18px!important;padding:0!important;border:0!important}.deepening-scenario{padding:16px;border-left:4px solid #2577ff;border-radius:9px;background:#fff}.deepening-scenario p{margin:5px 0 0!important}.deepening h3{margin-top:22px!important}.deepening ol{display:grid;gap:8px}.deepening ol li{padding:10px 12px;border-radius:8px;background:rgba(255,255,255,.78)}.deepening-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:20px}.deepening-grid>div{padding:15px;border:1px solid #caddef;border-radius:10px;background:#fff}.deepening-grid small,.deepening-grid strong{display:block}.deepening-grid small{margin-bottom:6px;color:#3971aa;font-weight:900}.deepening-grid strong{font-size:.9rem;line-height:1.55}@media(max-width:540px){.deepening{padding:19px 14px}.deepening-grid{grid-template-columns:1fr}}