:root {
  --paper:#fbfaf5; --ink:#252724; --muted:#67706a; --line:#d9ddd5;
  --blue:#b9dce8; --blue-deep:#25677b; --yellow:#f5d879; --pink:#efb9b5;
  --green:#bcd9c2; --white:#fff; --danger:#9e4946;
  --sidebar:292px; --content:820px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Sans",Meiryo,sans-serif;line-height:1.8;letter-spacing:.02em}
button,a{font:inherit} a{color:inherit}.skip{position:fixed;left:12px;top:-60px;background:#fff;padding:10px 14px;z-index:100}.skip:focus{top:12px}
.shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:100dvh}.sidebar{position:sticky;top:0;height:100dvh;padding:24px 18px;background:#f1f4ee;border-right:1px solid var(--line);overflow:auto;z-index:30}
.brand{display:flex;align-items:center;justify-content:space-between;margin:0 4px 26px}.brand-link{display:flex;gap:11px;align-items:center;text-decoration:none}.brand-mark{display:grid;place-items:center;width:45px;height:45px;background:var(--yellow);border:2px solid var(--ink);border-radius:47% 53% 42% 58%;font-weight:900;transform:rotate(-3deg);box-shadow:3px 3px 0 var(--ink)}.brand b{display:block;font-size:15px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:-2px}.close-menu{display:none;border:0;background:transparent;font-size:28px}
.overall-progress{background:#fff;border:1px solid var(--line);padding:13px 14px;margin-bottom:22px;border-radius:10px}.overall-progress>div:first-child{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted)}.overall-progress strong{color:var(--ink)}.progress-track{height:6px;background:#e8ebe6;border-radius:9px;margin-top:8px;overflow:hidden}.progress-track span{display:block;height:100%;width:0;background:var(--blue-deep);transition:width .3s}
.level-group{margin:17px 0}.level-title{display:flex;align-items:center;gap:8px;padding:0 8px;margin-bottom:5px;font-weight:800;font-size:12px}.level-dot{width:9px;height:9px;border:2px solid var(--ink);border-radius:50%}.nav-link{display:flex;gap:9px;align-items:center;width:100%;padding:8px 9px;border:0;border-radius:7px;background:transparent;text-align:left;color:#58605a;text-decoration:none;font-size:12px;line-height:1.35;margin:2px 0}.nav-link:hover,.nav-link:focus-visible{background:#fff;color:var(--ink)}.nav-link.active{background:#fff;color:var(--ink);font-weight:700;box-shadow:0 1px 0 #dfe3db}.nav-num{font-size:10px;color:#89908a;width:18px}.nav-check{margin-left:auto;color:var(--blue-deep);font-weight:900}.glossary-link{display:flex;justify-content:space-between;margin:22px 7px 0;padding:13px 4px;border-top:1px solid var(--line);font-size:12px;font-weight:800;text-decoration:none}
.page{min-width:0}.topbar{position:sticky;top:0;z-index:20;height:64px;background:rgba(251,250,245,.93);backdrop-filter:blur(10px);display:flex;align-items:center;padding:0 clamp(20px,4vw,56px);border-bottom:1px solid rgba(217,221,213,.7)}.crumb{font-size:12px;color:var(--muted)}.version{margin-left:auto;border:1px solid var(--line);border-radius:99px;background:#fff;padding:5px 11px;font-size:11px;color:var(--muted);cursor:pointer}.menu-button{display:none;border:0;background:transparent;font-size:23px;margin-right:12px}
main{max-width:var(--content);margin:0 auto;padding:64px 28px 96px;min-height:calc(100dvh - 130px)}
.hero{display:grid;grid-template-columns:1.08fr .92fr;gap:40px;align-items:center;margin-bottom:54px}.hero-copy .kicker,.eyebrow{font-size:11px;letter-spacing:.14em;font-weight:800;color:var(--blue-deep)}h1{font-size:clamp(32px,5vw,54px);line-height:1.25;letter-spacing:-.035em;margin:10px 0 19px}h2{font-size:clamp(24px,3.5vw,34px);line-height:1.35;letter-spacing:-.02em;margin:0 0 18px}h3{font-size:17px;line-height:1.5;margin:0 0 9px}.lead{font-size:16px;color:#505651;line-height:1.9}.hero-actions{display:flex;gap:11px;margin-top:27px}.button{display:inline-flex;justify-content:center;align-items:center;min-height:46px;padding:9px 18px;border:2px solid var(--ink);background:var(--ink);color:#fff;border-radius:8px;text-decoration:none;font-weight:800;font-size:13px;box-shadow:3px 3px 0 var(--yellow)}.button.secondary{background:#fff;color:var(--ink);box-shadow:none;border-width:1px}.button:focus-visible,.quiz-option:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}
.sketch{background:#fffdf6;border:2px solid var(--ink);border-radius:44% 56% 49% 51% / 8% 10% 7% 9%;padding:20px;transform:rotate(.4deg);box-shadow:8px 9px 0 rgba(37,39,36,.08)}.sketch svg{display:block;width:100%;height:auto}.sketch .line{fill:none;stroke:var(--ink);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.sketch .thin{stroke-width:2}.sketch text{font-family:inherit;fill:var(--ink);font-weight:800}.scribble{display:inline;background:linear-gradient(transparent 66%,var(--yellow) 0)}
.roadmap{margin-top:30px}.road-row{display:grid;grid-template-columns:90px 1fr 44px;gap:18px;align-items:center;padding:22px 0;border-top:1px solid var(--line);text-decoration:none}.road-row:last-child{border-bottom:1px solid var(--line)}.road-label{font-size:13px;font-weight:900}.road-label span{display:block;font-size:10px;font-weight:600;color:var(--muted)}.road-row p{margin:4px 0 0;color:var(--muted);font-size:13px}.road-arrow{font-size:24px}.road-row:hover .road-arrow{transform:translateX(4px)}
.lesson-head{margin-bottom:42px}.lesson-meta{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:12px;margin-bottom:10px}.level-pill{border:1px solid var(--ink);border-radius:99px;padding:2px 9px;color:var(--ink);font-weight:800;background:var(--yellow)}.lesson-head h1{font-size:clamp(30px,5vw,46px)}
.objective{display:grid;grid-template-columns:58px 1fr;gap:18px;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:21px 0;margin:24px 0 42px}.objective-icon{width:54px;height:54px;display:grid;place-items:center;background:var(--blue);border:2px solid var(--ink);border-radius:50% 46% 55% 42%;font-size:25px}.objective small{display:block;color:var(--blue-deep);font-weight:800}.objective p{margin:2px 0;font-weight:700;line-height:1.55}
.section{margin:50px 0}.section-label{display:flex;align-items:center;gap:9px;margin-bottom:15px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.08em}.section-label:before{content:"";width:24px;height:3px;background:var(--pink);transform:rotate(-2deg)}.section p{margin:0 0 16px}.explain-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:2px solid var(--ink);border-bottom:2px solid var(--ink)}.explain-item{padding:22px 20px;border-bottom:1px solid var(--line)}.explain-item:nth-child(odd){border-right:1px solid var(--line)}.explain-item:nth-last-child(-n+2){border-bottom:0}.explain-item .mini-icon{font-size:28px;display:block;margin-bottom:9px}.explain-item p{font-size:13px;color:var(--muted);margin:0}.example{background:#e9f3f5;padding:26px 28px;border-left:5px solid var(--blue-deep);border-radius:0 10px 10px 0}.example p:last-child{margin-bottom:0}.misconception{display:grid;grid-template-columns:72px 1fr;gap:20px;padding:24px 0;border-top:1px dashed #b7bbb5;border-bottom:1px dashed #b7bbb5}.misconception .stamp{display:grid;place-items:center;width:66px;height:66px;border:3px solid var(--danger);color:var(--danger);font-weight:900;border-radius:50%;transform:rotate(-8deg);line-height:1.1;text-align:center;font-size:12px}.misconception p{margin:0}.takeaway{position:relative;background:#fff7d9;padding:28px 28px 24px;margin-top:54px;border:2px solid var(--ink);border-radius:8px;box-shadow:6px 7px 0 var(--yellow)}.takeaway:before{content:"これだけ覚える";position:absolute;top:-17px;left:19px;background:var(--ink);color:#fff;padding:4px 12px;font-size:11px;font-weight:800;transform:rotate(-1deg)}.takeaway p{font-size:19px;font-weight:900;line-height:1.6;margin:0}
.quiz{margin-top:58px;background:#fff;border:1px solid var(--line);padding:28px;border-radius:12px}.quiz-head{display:flex;gap:12px;align-items:center}.quiz-no{font-size:12px;font-weight:900;color:var(--blue-deep)}.quiz h3{margin:12px 0 18px}.quiz-options{display:grid;gap:9px}.quiz-option{width:100%;text-align:left;border:1px solid var(--line);background:var(--paper);padding:13px 15px;border-radius:7px;cursor:pointer}.quiz-option:hover{border-color:var(--blue-deep)}.quiz-option.correct{border-color:#43835a;background:#edf7ef}.quiz-option.wrong{border-color:var(--danger);background:#fff0ef}.quiz-result{display:none;margin:15px 0 0;font-size:13px}.quiz-result.show{display:block}.quiz-result b{display:block}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:58px;padding-top:25px;border-top:1px solid var(--line)}.lesson-nav a{max-width:48%;text-decoration:none;color:var(--muted);font-size:12px}.lesson-nav a:last-child{text-align:right}.lesson-nav b{display:block;color:var(--ink);font-size:13px}
.glossary-search{width:100%;min-height:48px;border:1px solid var(--line);background:#fff;border-radius:9px;padding:10px 15px;font-size:15px;margin:5px 0 30px}.glossary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.term{background:var(--paper);padding:20px}.term b{display:block;margin-bottom:5px}.term small{color:var(--blue-deep);font-weight:800}.term p{font-size:13px;color:var(--muted);margin:7px 0 0}.sources li{margin-bottom:13px}.sources a{color:var(--blue-deep)}.notice{padding:18px 20px;border:1px solid var(--line);background:#fff;margin:25px 0;font-size:13px}
footer{max-width:var(--content);margin:0 auto;padding:28px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}footer p{margin:0}
.backdrop{display:none}dialog{width:min(520px,calc(100% - 32px));border:0;border-radius:12px;padding:30px;box-shadow:0 20px 80px #20231f44}dialog::backdrop{background:#25272477}.dialog-close{position:absolute;right:15px;top:12px;border:0;background:transparent;font-size:25px}.version-row{display:grid;grid-template-columns:50px 90px 1fr;gap:10px;border-top:1px solid var(--line);padding-top:17px;font-size:12px}.version-row p{margin:0;color:var(--muted)}
@media(max-width:850px){.shell{display:block}.sidebar{position:fixed;transform:translateX(-105%);transition:transform .25s;width:min(88vw,320px);box-shadow:10px 0 40px #2223}.sidebar.open{transform:none}.close-menu,.menu-button{display:block}.backdrop.show{display:block;position:fixed;inset:0;background:#2228;z-index:25}.topbar{padding:0 18px}.hero{grid-template-columns:1fr;gap:28px}.hero-copy{order:1}.hero .sketch{order:0;max-width:480px}.road-row{grid-template-columns:78px 1fr 30px}}
@media(max-width:560px){main{padding:38px 20px 70px}.topbar{height:58px}h1{font-size:34px}.lead{font-size:15px}.hero{margin-bottom:42px}.hero-actions{flex-direction:column}.button{width:100%}.sketch{padding:12px;box-shadow:5px 6px 0 rgba(37,39,36,.08)}.road-row{grid-template-columns:1fr 25px;gap:5px;padding:18px 0}.road-label{grid-column:1}.road-row>div:nth-child(2){grid-column:1}.road-arrow{grid-column:2;grid-row:1/3}.objective{grid-template-columns:46px 1fr;gap:13px}.objective-icon{width:44px;height:44px;font-size:20px}.explain-grid{grid-template-columns:1fr}.explain-item:nth-child(odd){border-right:0}.explain-item:nth-last-child(2){border-bottom:1px solid var(--line)}.example,.quiz{padding:22px 19px}.misconception{grid-template-columns:55px 1fr;gap:15px}.misconception .stamp{width:52px;height:52px;font-size:10px}.takeaway{padding:26px 20px 20px}.takeaway p{font-size:17px}.glossary-grid{grid-template-columns:1fr}.lesson-nav a{font-size:10px}.version-row{grid-template-columns:45px 1fr}.version-row p{grid-column:1/3}footer{flex-direction:column;padding:22px 20px}}
/* v1.1 readability and interaction refinement */
:root{--sidebar:304px;--content:880px}
body{font-size:16px;line-height:1.85;letter-spacing:.015em}
main{padding:60px 32px 104px}
.nav-link{min-height:38px;padding:9px;font-size:12.5px;color:#505852}
.close-menu{width:44px;height:44px;place-items:center;cursor:pointer}
.hero{gap:44px;margin-bottom:64px}
h1{font-size:clamp(34px,4.2vw,46px);line-height:1.3}
h2{line-height:1.4}
.button,.quiz-option{min-height:48px}
.lesson-head{margin-bottom:38px}
.lesson-meta{flex-wrap:wrap}
.lesson-head h1{font-size:clamp(30px,4.5vw,43px);max-width:18em}
.lesson-head~.sketch{max-width:460px;margin-inline:auto}
.read-time{margin-left:auto}
.section{margin:56px 0}
.section-label{font-size:12px;letter-spacing:.04em;margin-bottom:17px}
.explain-item{padding:24px 22px}
.explain-item p{font-size:14px;color:#5d645f}
.example{padding:28px 30px}
.misconception{gap:22px;padding:27px 0}
.takeaway{padding:30px 30px 26px;margin-top:58px}
.version-row{padding:17px 0}
.version-row.current b{color:var(--blue-deep)}
@media(min-width:851px){.hero h1{font-size:40px}}
@media(max-width:850px){.sidebar{padding-bottom:calc(24px + env(safe-area-inset-bottom))}.close-menu{display:grid}.menu-button{width:44px;height:44px;margin-left:-10px}.hero-copy,.hero .sketch{order:initial}}
@media(max-width:560px){main{padding:34px 20px calc(76px + env(safe-area-inset-bottom))}.crumb{max-width:62vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}h1{font-size:32px}.lesson-head h1{font-size:30px}.read-time{width:100%;margin-left:0}.objective{margin-bottom:32px}.takeaway{padding:27px 20px 21px}}

/* v1.2: first-view course selector and restrained illustrations */
.home-main{max-width:1040px;padding-top:26px;padding-bottom:42px}
.home-main .hero{grid-template-columns:minmax(0,1fr) 330px;gap:42px;margin-bottom:24px}
.home-main .hero h1{margin-top:4px;margin-bottom:10px;font-size:38px;line-height:1.22}
.home-main .hero .lead{max-width:560px;margin:0 0 8px;font-size:14px;line-height:1.75}
.home-main .hero .sketch{width:330px;padding:10px;box-shadow:5px 6px 0 rgba(37,39,36,.07)}
.home-main .hero .sketch svg{max-height:205px}
.text-link{display:inline-block;margin-top:5px;color:var(--blue-deep);font-size:12px;font-weight:800;text-underline-offset:4px}
.course-select{border-top:1px solid var(--line);padding-top:19px}
.course-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:13px}
.course-heading .eyebrow{margin:0 0 3px}
.course-heading h2{margin:0;font-size:23px}
.course-heading>p{margin:0;color:var(--muted);font-size:12px}
.home-main .roadmap{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:0}
.home-main .road-row{display:grid;grid-template-columns:1fr 24px;gap:10px;min-height:132px;padding:17px 17px 15px;border:1px solid var(--line);border-top:5px solid var(--level-color);border-radius:9px;background:#fff}
.home-main .road-row:last-child{border-bottom:1px solid var(--line)}
.home-main .road-label{grid-column:1;font-size:17px}
.home-main .road-label span{margin-top:2px;font-size:9px}
.home-main .road-row>div:nth-child(2){grid-column:1}
.home-main .road-row>div:nth-child(2) b{font-size:13px}
.home-main .road-row p{margin-top:1px;font-size:11px}
.home-main .road-arrow{grid-column:2;grid-row:1/3;align-self:center;font-size:21px}
.home-main .road-row:hover{border-color:#9ba39c;transform:translateY(-2px)}
@media(max-width:850px){.home-main{padding-top:30px}.home-main .hero{grid-template-columns:1fr 280px;gap:24px}.home-main .hero .sketch{width:280px}.home-main .roadmap{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-head~.sketch{max-width:440px}}
@media(max-width:700px){.home-main .hero{grid-template-columns:1fr}.home-main .hero .sketch{width:min(100%,300px);margin:0 auto}.home-main .roadmap{grid-template-columns:1fr}.home-main .road-row{min-height:100px}.course-heading{align-items:start}.course-heading>p{white-space:nowrap}.lesson-head~.sketch{max-width:320px}}
@media(max-width:560px){.home-main{padding-top:24px}.home-main .hero{gap:20px;margin-bottom:28px}.home-main .hero h1{font-size:31px}.home-main .hero .lead{font-size:14px}.home-main .hero .sketch{width:min(86%,280px)}.home-main .hero .sketch svg{max-height:180px}.course-heading{display:block}.course-heading h2{font-size:22px}.course-heading>p{margin-top:3px}.home-main .road-row{min-height:94px}.lesson-head~.sketch{width:min(90%,300px)}.lesson-head~.sketch svg{max-height:220px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* v1.3: visible lesson steps and stronger next action */
.lesson-progress{display:flex;align-items:center;gap:26px;margin:18px 0 24px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:12px}
.step-current{display:grid;grid-template-columns:auto auto;align-items:end;column-gap:10px;min-width:112px;line-height:1}
.step-current small{grid-column:1/3;margin-bottom:7px;color:var(--muted);font-size:12px;font-weight:800}
.step-current strong{font-size:52px;line-height:.82;color:var(--blue-deep);letter-spacing:-.06em}
.step-current>span{padding-bottom:3px;color:var(--muted);font-size:12px;font-weight:700;white-space:nowrap}
.step-list{display:flex;align-items:center;flex:1;min-width:0}
.lesson-step{position:relative;display:grid;place-items:center;flex:1;min-width:0;text-decoration:none;color:#737a74}
.lesson-step:not(:last-child):after{content:"";position:absolute;left:calc(50% + 18px);right:calc(-50% + 18px);top:50%;height:2px;background:var(--line);z-index:0}
.lesson-step span{position:relative;z-index:1;display:grid;place-items:center;width:32px;height:32px;border:2px solid var(--line);border-radius:50%;background:var(--paper);font-size:13px;font-weight:900}
.lesson-step.passed span{border-color:var(--level-color);background:var(--level-color);color:var(--ink)}
.lesson-step.current span{width:48px;height:48px;border-color:var(--ink);background:var(--level-color);color:var(--ink);font-size:22px;box-shadow:3px 3px 0 var(--ink)}
.lesson-step:focus-visible{outline:3px solid var(--yellow);outline-offset:5px;border-radius:50%}
.lesson-nav{align-items:end;gap:24px;padding-top:28px}
.lesson-nav a{max-width:none;text-align:left!important}
.lesson-prev{max-width:34%!important;color:var(--muted);font-size:12px}
.lesson-prev b{font-size:13px}
.lesson-next{position:relative;display:grid;grid-template-columns:1fr 34px;min-width:min(100%,310px);min-height:88px;padding:18px 20px 16px 24px;border:2px solid var(--ink);border-radius:12px;background:var(--ink);color:#fff!important;box-shadow:6px 7px 0 var(--yellow)}
.lesson-next span{font-size:13px;font-weight:700;color:#d9ded9}
.lesson-next b{font-size:17px!important;line-height:1.4;color:#fff!important}
.lesson-next i{grid-column:2;grid-row:1/3;align-self:center;font-size:30px;font-style:normal;transition:transform .2s}
.lesson-next:hover i{transform:translateX(5px)}
.lesson-next:focus-visible{outline:4px solid var(--yellow);outline-offset:4px}
@media(max-width:700px){.lesson-progress{display:block;padding:16px}.step-current{grid-template-columns:auto 1fr;min-width:0;margin-bottom:18px}.step-current small{grid-column:1/3}.step-current strong{font-size:46px}.step-list{width:100%}.lesson-step:not(:last-child):after{left:calc(50% + 15px);right:calc(-50% + 15px)}.lesson-step span{width:29px;height:29px;font-size:12px}.lesson-step.current span{width:42px;height:42px;font-size:19px}.lesson-nav{align-items:stretch;flex-direction:column-reverse}.lesson-prev{max-width:100%!important;padding:8px 2px}.lesson-next{width:100%;min-width:0;min-height:92px}.lesson-nav>span:empty{display:none}}

/* v1.4: inline explanations that keep the reading flow in place */
.inline-help-note{display:flex;align-items:center;gap:14px;margin:-14px 0 32px;color:var(--ink)}
.help-guide-character{flex:0 0 56px;width:56px;height:56px;overflow:visible}.help-guide-character rect{fill:#b9dce8}.help-guide-character path,.help-guide-character circle{fill:none;stroke:var(--ink);stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}.help-guide-character circle{fill:var(--ink);stroke:none}
.inline-help-note p{position:relative;margin:0;padding:12px 16px;border:1.5px solid var(--ink);border-radius:10px;background:#fff;font-size:13px;line-height:1.55;box-shadow:3px 4px 0 #e8e6de}.inline-help-note p::before{content:"";position:absolute;left:-8px;top:20px;width:13px;height:13px;border-width:0 0 1.5px 1.5px;border-style:solid;border-color:var(--ink);background:#fff;transform:rotate(45deg)}.inline-help-note b{display:block;margin-bottom:2px;color:var(--blue-deep);font-size:14px}.inline-help-note p>span{display:block;color:#59615b}
.term-help{display:inline;margin:0;padding:0 .06em .02em;border:0;border-bottom:1.5px dashed #3b7889;background:linear-gradient(transparent 72%,#dceef2 72%);color:inherit;font:inherit;font-weight:inherit;line-height:inherit;cursor:pointer;text-align:inherit;text-decoration:none}
.term-help:hover{background:#dceef2;border-bottom-style:solid}
.term-help:focus-visible{outline:3px solid var(--yellow);outline-offset:3px;border-radius:3px}
.term-dialog{width:min(480px,calc(100% - 32px));max-height:min(620px,calc(100dvh - 32px));padding:34px 32px 30px;border:2px solid var(--ink);border-radius:16px;background:#fffdf7;box-shadow:8px 9px 0 var(--yellow),0 24px 80px #20231f40;color:var(--ink)}
.term-dialog::backdrop{background:#20231f80;backdrop-filter:blur(2px)}
.term-dialog-handle{display:none}
.term-dialog-close{position:absolute;right:18px;top:16px;min-height:44px;padding:7px 9px;border:0;background:transparent;color:var(--muted);font:inherit;font-size:13px;font-weight:800;cursor:pointer}
.term-dialog-close span{font-size:22px;vertical-align:-2px;margin-left:3px}
.term-dialog-kicker{margin:0 0 7px;color:var(--blue-deep);font-size:12px;font-weight:900;letter-spacing:.08em}
.term-dialog h2{margin:0 80px 1px 0;font-size:32px;line-height:1.35}
.term-dialog-reading{margin:0 0 22px;color:var(--muted);font-size:13px;font-weight:700}
.term-dialog-definition{margin:0;padding:20px 0;border-top:1px solid var(--line);font-size:17px;line-height:1.85;font-weight:700}
.term-dialog-return{width:100%;min-height:52px;margin-top:18px;border:2px solid var(--ink);border-radius:9px;background:var(--ink);color:#fff;font:inherit;font-weight:900;cursor:pointer;box-shadow:4px 5px 0 var(--yellow)}
.term-dialog-return:focus-visible,.term-dialog-close:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}
@media(max-width:560px){.inline-help-note{align-items:flex-start;gap:10px;margin:-8px 0 26px}.help-guide-character{flex-basis:46px;width:46px;height:46px}.inline-help-note p{padding:10px 12px;font-size:12px}.inline-help-note p::before{top:15px}.inline-help-note b{font-size:13px}.term-help{padding-block:.08em}.term-dialog{width:100%;max-width:none;max-height:min(72dvh,620px);margin:auto 0 0;padding:30px 20px calc(22px + env(safe-area-inset-bottom));border-width:2px 0 0;border-radius:20px 20px 0 0;box-shadow:0 -10px 40px #20231f30}.term-dialog-handle{display:block;width:42px;height:5px;margin:-17px auto 20px;border-radius:99px;background:#c8ccc6}.term-dialog-close{top:19px;right:12px}.term-dialog h2{font-size:29px}.term-dialog-definition{font-size:16px}}

/* v1.8: level tests */
.nav-test-link{margin-top:7px;border:1px solid var(--line);background:#fff;font-weight:900}.nav-test-link .nav-num{width:31px;font-size:8px;color:var(--blue-deep)}.nav-score{margin-left:auto;color:var(--blue-deep);font-size:11px;white-space:nowrap}
.test-main{max-width:820px}.test-intro,.test-shell,.test-result{--test-color:var(--yellow)}
.test-intro{position:relative;max-width:650px;margin:30px auto;padding:46px 48px;border:2px solid var(--ink);border-top:9px solid var(--test-color);border-radius:14px;background:#fff;box-shadow:8px 9px 0 rgba(37,39,36,.08)}.test-intro header{max-width:570px}.test-level{display:inline-block;margin-bottom:18px;padding:4px 11px;border:1px solid var(--ink);border-radius:99px;background:var(--test-color);font-size:13px;font-weight:900}.test-intro h1{margin:5px 0 15px;font-size:44px}.test-rule{display:flex;align-items:end;gap:8px;margin:30px 0;padding:22px 0;border-block:1px solid var(--line)}.test-rule strong{font-size:58px;line-height:.8;color:var(--blue-deep)}.test-rule>span{font-weight:900}.test-rule p{margin:0 0 0 auto;color:var(--muted);font-size:13px;line-height:1.65;text-align:right}
.test-primary{display:flex;align-items:center;justify-content:space-between;width:100%;min-height:64px;padding:15px 21px;border:2px solid var(--ink);border-radius:10px;background:var(--ink);color:#fff;font:inherit;font-size:16px;font-weight:900;cursor:pointer;box-shadow:5px 6px 0 var(--test-color)}.test-primary:disabled{cursor:not-allowed;opacity:.38;box-shadow:none}.test-primary:not(:disabled):hover span{transform:translateX(4px)}.test-primary span{font-size:25px;transition:transform .2s}.test-primary:focus-visible,.test-option:focus-visible{outline:4px solid var(--yellow);outline-offset:4px}.test-back{display:inline-block;margin-top:24px;color:var(--muted);font-size:13px}
.test-progress-head{margin-bottom:38px}.test-progress-head>div:first-child{display:flex;align-items:end;gap:8px}.test-progress-head>div:first-child>span{margin-right:auto;color:var(--muted);font-size:14px;font-weight:800}.test-progress-head strong{font-size:54px;line-height:.8;color:var(--blue-deep)}.test-progress-head small{font-size:14px;color:var(--muted);font-weight:800}.test-progress-track{height:9px;margin-top:17px;overflow:hidden;border-radius:99px;background:#e6e8e2}.test-progress-track span{display:block;height:100%;border-radius:inherit;background:var(--test-color);transition:width .25s}
.test-question{padding:40px 42px;border:2px solid var(--ink);border-radius:14px;background:#fff;box-shadow:7px 8px 0 rgba(37,39,36,.07)}.test-question-label{margin:0 0 8px;color:var(--blue-deep);font-size:13px;font-weight:900}.test-question h1{max-width:22em;margin:0 0 30px;font-size:clamp(25px,4vw,34px);line-height:1.5;letter-spacing:-.02em}.test-options{display:grid;gap:12px}.test-option{display:grid;grid-template-columns:38px 1fr;align-items:center;gap:14px;width:100%;min-height:64px;padding:11px 16px;border:2px solid var(--line);border-radius:10px;background:var(--paper);color:var(--ink);font:inherit;font-size:15px;font-weight:700;text-align:left;cursor:pointer}.test-option>span{display:grid;place-items:center;width:34px;height:34px;border:2px solid var(--ink);border-radius:50%;background:#fff;font-weight:900}.test-option:hover{border-color:#8a918a}.test-option.selected{border-color:var(--ink);background:color-mix(in srgb,var(--test-color) 30%,white);box-shadow:3px 4px 0 var(--ink)}.test-option.selected>span{background:var(--test-color)}.test-actions{width:min(100%,360px);margin:34px 0 0 auto}.test-actions p{margin:13px 0 0;color:var(--muted);font-size:12px;text-align:center}
.result-hero{padding-bottom:38px;border-bottom:2px solid var(--ink);text-align:center}.result-hero h1{font-size:clamp(28px,5vw,42px)}.score-display{display:flex;align-items:end;justify-content:center;gap:10px;margin:22px 0}.score-display strong{font-size:92px;line-height:.78;color:var(--blue-deep);letter-spacing:-.07em}.score-display span{font-size:17px;font-weight:900}.result-hero>p:last-child{max-width:560px;margin:24px auto 0;color:var(--muted)}.mistake-section{margin-top:48px}.result-section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.result-section-head h2{margin:0}.result-section-head span{padding:3px 10px;border-radius:99px;background:var(--test-color);font-size:13px;font-weight:900}.mistake-list{display:grid;gap:18px}.mistake-item{padding:26px 28px;border:1px solid var(--line);border-left:6px solid var(--test-color);border-radius:0 10px 10px 0;background:#fff}.mistake-no{margin:0 0 5px;color:var(--blue-deep);font-size:12px;font-weight:900}.mistake-item h3{font-size:18px}.mistake-item dl{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.mistake-item dl>div{padding:13px 15px;border-radius:7px;background:#f7f7f3}.mistake-item .correct-answer{background:#edf7ef}.mistake-item dt{font-size:11px;font-weight:900;color:var(--muted)}.mistake-item dd{margin:3px 0 0;font-size:14px;font-weight:800}.mistake-why{margin:15px 0;font-size:14px;color:var(--muted)}.mistake-item>a{color:var(--blue-deep);font-size:13px;font-weight:900}.perfect-result{margin:42px 0;padding:35px 25px;background:#edf7ef;text-align:center}.perfect-result>span{font-size:48px;color:#43835a}.perfect-result h2{margin:5px 0 8px}.perfect-result p{margin:0}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:42px}.result-actions .button{min-height:64px}.result-actions .test-primary{justify-content:center}
@media(min-width:851px){.test-main{padding-top:32px;padding-bottom:48px}.test-progress-head{margin-bottom:22px}.test-progress-head strong{font-size:46px}.test-progress-track{height:7px;margin-top:12px}.test-question{padding:27px 32px}.test-question h1{margin-bottom:20px;font-size:28px;line-height:1.42}.test-options{gap:9px}.test-option{min-height:54px;padding:8px 14px}.test-option>span{width:30px;height:30px}.test-actions{margin-top:22px}.test-actions .test-primary{min-height:56px}.test-actions p{margin-top:8px}}
@media(max-width:560px){.test-main{padding-inline:16px}.test-intro{margin:8px auto;padding:31px 22px;box-shadow:5px 6px 0 rgba(37,39,36,.08)}.test-intro h1{font-size:34px}.test-rule{align-items:center}.test-rule strong{font-size:49px}.test-rule p{font-size:11px}.test-progress-head{margin-bottom:25px}.test-progress-head strong{font-size:46px}.test-progress-head>div:first-child>span{font-size:12px}.test-question{padding:28px 18px;box-shadow:4px 5px 0 rgba(37,39,36,.07)}.test-question h1{font-size:24px;line-height:1.5;margin-bottom:24px}.test-option{grid-template-columns:34px 1fr;gap:11px;min-height:62px;padding:10px 12px;font-size:14px}.test-option>span{width:31px;height:31px}.test-actions{width:100%;margin-top:28px}.score-display strong{font-size:78px}.mistake-item{padding:22px 18px}.mistake-item dl{grid-template-columns:1fr}.result-actions{grid-template-columns:1fr}.result-actions .button{width:100%}}

/* v1.11: practical use-case appendix */
.use-case-main{max-width:1040px}.use-case-head{max-width:800px}.use-case-head .level-pill{background:var(--yellow)}.use-case-head h1{max-width:19em;margin-top:16px}.use-case-head .lead{max-width:780px}
.glossary-link+.glossary-link{margin-top:0}
.use-case-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.use-case-card{overflow:hidden;border:1.5px solid var(--ink);border-top:8px solid var(--case-color);background:#fff;box-shadow:5px 6px 0 rgba(37,39,36,.07)}.use-case-card>header{display:flex;align-items:flex-start;gap:14px;padding:24px 25px 18px}.use-case-icon{display:grid;place-items:center;flex:0 0 48px;width:48px;height:48px;border:1.5px solid var(--ink);border-radius:50%;background:var(--case-color);font-size:23px}.use-case-card header small{display:block;margin-bottom:2px;color:var(--blue-deep);font-size:13px;font-weight:900}.use-case-card h2{margin:0;font-size:21px;line-height:1.45}.use-case-benefit{margin:0;padding:0 25px 22px;color:#505852;font-size:15px;line-height:1.8}.prompt-starter{margin:0 25px;padding:18px 19px;background:#f7f5ee;border-left:4px solid var(--case-color)}.prompt-starter h3,.learning-links h3{margin:0 0 9px;font-size:13px;color:var(--blue-deep)}.prompt-starter p{margin:0;font-size:14px;line-height:1.75;font-weight:700}.learning-links{padding:21px 25px 25px}.learning-links dl{margin:0}.learning-links dl>div{display:grid;grid-template-columns:112px 1fr;gap:12px;padding:8px 0;border-top:1px solid var(--line)}.learning-links dt{font-size:13px;font-weight:900}.learning-links dd{margin:0;color:#59615b;font-size:13px;line-height:1.65}.use-case-note{display:flex;align-items:center;gap:22px;margin:48px 0 0;padding:27px 30px;border:2px solid var(--ink);background:#e9f3f5;box-shadow:6px 7px 0 var(--yellow)}.use-case-note .help-guide-character{flex-basis:68px;width:68px;height:68px}.use-case-note h2{margin:0 0 5px;font-size:22px}.use-case-note p{margin:0;color:#505852;font-size:15px}
@media(max-width:760px){.use-case-grid{grid-template-columns:1fr}.use-case-card>header{padding:21px 20px 15px}.use-case-benefit{padding:0 20px 20px}.prompt-starter{margin:0 20px}.learning-links{padding:19px 20px 22px}.use-case-note{align-items:flex-start;padding:22px 20px}.use-case-note .help-guide-character{flex-basis:52px;width:52px;height:52px}}
@media(max-width:420px){.use-case-card h2{font-size:19px}.learning-links dl>div{grid-template-columns:90px 1fr}.use-case-note{gap:12px}.use-case-note h2{font-size:18px}.use-case-note p{font-size:14px}}

/* v1.12: agent examples and discoverable home link */
.agent-examples>.use-case-note{margin:24px 0 30px;background:#fff7d9}.agent-examples>.use-case-note h2{font-size:20px}
.home-use-case-banner{display:grid;grid-template-columns:minmax(0,1fr) 44%;align-items:stretch;gap:0;min-height:112px;margin-top:16px;overflow:hidden;border:2px solid var(--ink);border-radius:10px;background:#e9f3f5;color:var(--ink);text-decoration:none;box-shadow:4px 5px 0 var(--yellow);transition:transform .2s}.home-use-case-banner:hover{transform:translateY(-2px)}.home-use-case-banner:focus-visible{outline:4px solid var(--yellow);outline-offset:4px}.home-banner-copy{display:flex;flex-direction:column;justify-content:center;padding:12px 10px 11px 15px}.home-banner-copy small,.home-banner-copy b,.home-banner-copy>span{display:block}.home-banner-copy small{color:var(--blue-deep);font-size:11px;font-weight:900}.home-banner-copy b{font-size:16px;line-height:1.45}.home-banner-copy>span{margin-top:1px;color:#505852;font-size:11px;line-height:1.55}.home-banner-copy em{margin-top:5px;color:var(--blue-deep);font-size:12px;font-style:normal;font-weight:900}.home-banner-copy i{font-size:15px;font-style:normal}.home-use-case-banner img{display:block;width:100%;height:100%;min-height:108px;object-fit:cover;object-position:center}
.agent-examples{margin-top:72px;padding-top:50px;border-top:3px solid var(--ink)}.agent-examples-head{max-width:820px;margin-bottom:30px}.agent-examples-head>span{display:inline-block;padding:4px 10px;border-radius:99px;background:var(--yellow);font-size:12px;font-weight:900}.agent-examples-head h2{margin:12px 0 10px;font-size:32px}.agent-examples-head>p{margin:0;color:#505852;font-size:16px}.agent-formula{display:flex;align-items:center;gap:9px;margin-top:22px}.agent-formula b{padding:7px 12px;border:1.5px solid var(--ink);background:#fff;font-size:13px}.agent-formula i{font-style:normal;color:var(--blue-deep);font-weight:900}
.agent-case-list{display:grid;gap:24px}.agent-case{padding:27px 28px;border:1.5px solid var(--ink);background:#fff;box-shadow:6px 7px 0 rgba(37,39,36,.08)}.agent-case>header{display:flex;align-items:center;gap:15px}.agent-case>header small{display:block;color:var(--blue-deep);font-size:13px;font-weight:900}.agent-case h3{margin:1px 0 0;font-size:23px}.agent-result{margin:18px 0 20px;color:#505852;font-size:15px}.agent-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--line)}.agent-flow>div{position:relative;min-height:88px;padding:13px 14px;background:#f7f7f3}.agent-flow>div+div{border-left:1px solid var(--line)}.agent-flow>div:not(:last-child)::after{content:"→";position:absolute;z-index:1;right:-10px;top:31px;color:var(--blue-deep);font-weight:900}.agent-flow small,.agent-flow b{display:block}.agent-flow small{margin-bottom:4px;color:var(--muted);font-size:11px;font-weight:900}.agent-flow b{font-size:13px;line-height:1.55}.agent-prompt{margin-top:20px;padding:18px 20px;border-left:5px solid var(--blue-deep);background:#edf5f6}.agent-prompt h4{margin:0 0 7px;color:var(--blue-deep);font-size:13px}.agent-prompt p{margin:0;font-size:14px;line-height:1.75;font-weight:700}
@media(max-width:760px){.agent-examples{margin-top:54px;padding-top:38px}.agent-examples-head h2{font-size:27px}.agent-formula{display:grid;grid-template-columns:1fr 18px 1fr;gap:7px}.agent-formula i:nth-of-type(2){display:none}.agent-formula b{font-size:12px;text-align:center}.agent-case{padding:22px 20px}.agent-case h3{font-size:20px}.agent-flow{grid-template-columns:1fr 1fr}.agent-flow>div:nth-child(3){border-left:0;border-top:1px solid var(--line)}.agent-flow>div:nth-child(4){border-top:1px solid var(--line)}.agent-flow>div::after{display:none}.agent-prompt{padding:16px}}
@media(max-width:560px){.home-use-case-banner{grid-template-columns:minmax(0,1fr) 42%;min-height:106px}.home-banner-copy{padding:10px 7px 9px 12px}.home-banner-copy small{font-size:10px}.home-banner-copy b{font-size:14px}.home-banner-copy>span{font-size:10px;line-height:1.45}.home-banner-copy em{font-size:11px}.home-use-case-banner img{min-height:102px}.agent-examples-head>p{font-size:15px}.agent-case>header{align-items:flex-start}.agent-flow{grid-template-columns:1fr}.agent-flow>div+div,.agent-flow>div:nth-child(3){border-left:0;border-top:1px solid var(--line)}.agent-flow>div{min-height:0}.agent-prompt p{font-size:13px}}