@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700;800;900&display=swap');
:root{--ink:#233b3a;--muted:#697b7c;--teal:#08645e;--teal-dark:#064e49;--line:#dfe7e6;--bg:#f5f8f8;--mint:#e3f3ed;--blue:#eaf0fc;--orange:#fff0df;--shadow:0 8px 24px #203a3910;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans JP',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:16px;line-height:1.8}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{color:inherit}button:disabled{cursor:not-allowed;opacity:.42}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.5;letter-spacing:.025em}h1{font-size:30px;font-weight:800}h2{font-size:23px;font-weight:800}h3{font-size:18px;font-weight:700}p{overflow-wrap:anywhere}a,button{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid 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30px;width:100%}progress{appearance:none;border:0;border-radius:10px;overflow:hidden;background:#e8efec}progress::-webkit-progress-bar{background:#e8efec;border-radius:10px}progress::-webkit-progress-value{background:#389787;border-radius:10px}progress::-moz-progress-bar{background:#389787;border-radius:10px}fieldset{border:0;padding:0;margin:0;min-width:0}legend{font-size:22px;line-height:1.8;font-weight:700;margin:0 0 26px;padding:0}.answer-options{display:grid;gap:12px}.quiz-actions{display:flex;align-items:start;justify-content:space-between;gap:18px;margin-top:28px}.hint{font-size:13px;color:#728378;max-width:50%}.hint summary{cursor:pointer;min-height:44px;display:flex;align-items:center}.hint summary:before{content:'＋';margin-right:6px}.hint[open] summary:before{content:'−'}.hint p{font-size:13px;padding:10px;border-radius:8px;background:#fff8ea}.feedback{margin-top:30px;border-top:1px solid var(--line);padding-top:27px}.feedback h2{font-size:22px;color:var(--teal)}.feedback>p{font-size:15px;margin:12px 0;line-height:2}.reasons{margin:20px 0;background:#f6f8f7;padding:17px;border-radius:10px}.reasons p{display:flex;gap:12px;font-size:13px;line-height:1.9;padding:8px 0}.reasons b{font-size:12px;color:var(--teal);flex-shrink:0}.explanation-link{background:#ebf3ee;padding:17px;border-radius:10px;display:flex;align-items:center;gap:13px;margin:22px 0}.explanation-link small{display:block;font-size:10px;color:#718b7e}.explanation-link strong{font-size:14px}.explanation-link>.icon{margin-left:auto;width:18px;color:var(--teal)}.return-quiz{border:1px solid #bbd7ca;background:#e9f4ef;color:var(--teal);border-radius:8px;padding:9px 14px;font-size:12px;margin-bottom:20px;display:block}.quiz-footnote{max-width:800px;margin:auto;font-size:12px;color:var(--muted)}.muted{color:var(--muted);font-size:13px}.result-header{text-align:center;margin:15px auto 28px}.result-icon{display:grid;place-items:center;background:#dfeee7;border-radius:50%;width:62px;height:62px;margin:0 auto 19px;color:var(--teal)}.result-icon .icon{width:30px;height:30px}.result-header p{font-size:14px;color:var(--muted);margin-top:10px}.result-card{max-width:800px;margin:auto;background:white;border:1px solid var(--line);border-radius:var(--radius);padding:30px}.score{text-align:center;margin-bottom:10px}.score strong{font-size:74px;line-height:1.4;color:var(--teal);letter-spacing:-.05em}.score span{margin-left:9px;color:var(--muted);font-size:17px}.result-card>.muted{text-align:center;font-size:12px}.result-breakdown{margin-top:25px;padding:0 15px}.result-breakdown>div{display:flex;gap:15px;align-items:center;font-size:12px;margin:13px 0}.result-breakdown>div>span{width:115px;flex-shrink:0}.result-breakdown progress{height:8px;flex:1;width:100%}.result-question{border-bottom:1px solid var(--line)}.result-question summary{display:flex;align-items:center;gap:12px;padding:19px 0;cursor:pointer;font-size:14px;list-style:none}.result-question summary:after{content:'＋';margin-left:auto;flex-shrink:0}.result-question[open] summary:after{content:'−'}.result-question>div{padding:0 0 20px 36px;font-size:14px;line-height:2}.result-question>div>p{margin:10px 0}.result-indicator{width:25px;height:25px;border-radius:50%;background:#fff0de;color:#af772e;display:grid;place-items:center;flex-shrink:0}.result-indicator.ok{background:#e3f1e9;color:var(--teal)}.result-actions{display:flex;justify-content:center;gap:12px;margin-top:30px}.mock-layout{display:grid;grid-template-columns:1fr 1.2fr;gap:55px;background:white;border:1px solid var(--line);padding:42px;border-radius:var(--radius)}.mock-preview{padding:10px}.mock-paper{max-width:290px;min-height:350px;background:var(--teal);color:white;margin:0 auto;transform:rotate(-4deg);border-radius:3px 12px 12px 3px;box-shadow:10px 13px 0 #dbe7e0,12px 20px 25px #153e3220;border-left:8px solid #04524e;padding:30px}.mock-paper>span{font-size:10px;letter-spacing:.18em;color:#b9d6cc}.paper-line{background:#66978b;height:1px;margin:18px 0 23px}.mock-paper h2{font-size:29px;line-height:1.7;font-weight:600}.mock-paper>strong{font-size:65px;line-height:1.3;display:flex;align-items:end;margin-top:20px;font-weight:500;letter-spacing:-.04em}.mock-paper strong>span{font-size:12px;margin:0 0 13px 15px;letter-spacing:0}.paper-bottom{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#bdd9cf;margin-top:20px}.mock-features{display:grid;gap:11px;margin:38px auto 0;max-width:280px;font-size:13px;color:var(--muted)}.mock-features>span{display:flex;gap:9px}.mock-features .icon{width:17px;color:var(--teal)}.mock-details h2{font-size:27px;margin:16px 0}.mock-details>p{font-size:14px;color:var(--muted);line-height:2}.price{display:flex;align-items:baseline;gap:9px;margin:21px 0 1px}.price strong{font-size:54px;font-weight:600;line-height:1.4;letter-spacing:-.05em}.price>span{font-size:13px}.mock-details .price-note{font-size:11px;margin-bottom:21px}.sample-trial{border-top:1px solid var(--line);padding-top:23px;margin-top:24px}.sample-trial>span{font-size:11px;color:var(--teal);font-weight:600}.sample-trial h3{font-size:19px;margin:4px 0}.sample-trial p{font-size:12px;color:var(--muted);margin:5px 0 15px}.sample-trial small{font-size:10px;color:var(--muted);display:block;margin-top:10px}.mock-note{display:flex;gap:14px;align-items:center;margin-top:28px;padding:20px 25px;background:#eaf2ee;border-radius:12px;color:#688376}.mock-note p{font-size:12px}.review-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:28px 0}.review-stats>div{background:white;border:1px solid var(--line);border-radius:14px;padding:22px}.review-stats span{font-size:13px;color:var(--muted)}.review-stats strong{display:block;font-size:38px;color:var(--teal);font-weight:600;line-height:1.5}.review-stats small{font-size:13px;color:var(--muted);margin-left:9px;font-weight:400}.review-section{margin:35px 0}.empty-state{text-align:center;padding:45px 25px;background:white;border:1px dashed #cddcd5;border-radius:14px}.empty-state>.icon{width:33px;height:33px;color:#91b3a5;margin-bottom:13px}.empty-state h3{font-size:17px}.empty-state p{font-size:13px;color:var(--muted);margin:10px 0 20px}.empty-state.compact{padding:24px}.wrong-list{background:white;border:1px solid var(--line);border-radius:12px;padding:0 20px}.wrong-list button{background:transparent;display:flex;width:100%;gap:13px;text-align:left;align-items:center;border:0;padding:18px 0;border-bottom:1px solid var(--line);font-size:14px}.wrong-list button:last-child{border-bottom:0}.wrong-list button>.icon{color:#79a18e;width:18px}.wrong-list button>.icon:last-child{margin-left:auto}.storage-note{font-size:12px;color:var(--muted);margin-top:25px}.storage-note button{border:0;padding:5px 0;min-height:44px;background:transparent;color:var(--teal);text-decoration:underline}.toast{position:fixed;bottom:25px;left:calc(50% + 112px);transform:translate(-50%,20px);background:#204b42;color:white;border-radius:10px;padding:12px 20px;font-size:13px;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;box-shadow:var(--shadow);max-width:90vw}.toast.show{opacity:1;transform:translate(-50%,0)}dialog{border:0;border-radius:20px;width:min(480px,calc(100% - 36px));padding:36px;box-shadow:0 30px 100px #132c4b55;color:var(--ink)}dialog::backdrop{background:#12342d80;backdrop-filter:blur(4px)}.dialog-close{position:absolute;right:15px;top:12px;width:44px;height:44px;font-size:26px;background:transparent;border:0}.dialog-symbol{font-size:43px;color:var(--teal);font-weight:700;line-height:1.5}.dialog-symbol span{font-size:12px;margin-left:9px;font-weight:400}dialog h2{font-size:22px;margin:12px 0}dialog>p{font-size:14px;color:var(--muted);line-height:2}.soft-note{background:#edf5f0;border-radius:10px;padding:16px;font-size:13px;line-height:2;margin:23px 0}.icon-button{display:grid;place-items:center}
/* Readable Japanese on compact layouts */
@media(min-width:1550px){.start-copy{padding:35px 0 35px 37px}.start-copy h2{font-size:33px}.start-card{min-height:360px}.start-art{right:0;width:47%}.start-copy p{font-size:15px}.daily-card>p{font-size:17px}.path-card p,.lesson-card p{font-size:14px}.path-card h3,.lesson-card h3{font-size:19px}}
@media(max-width:1200px){.sidebar{width:205px;padding-left:14px;padding-right:14px}.app-shell{margin-left:205px}.topbar{padding:0 28px}main{padding:30px 28px 20px}.home-grid{grid-template-columns:1fr}.daily-card{display:none}.start-card{min-height:320px}.start-art{width:43%;right:6%}.start-copy{width:54%}.start-copy h2{font-size:30px}.path-card,.lesson-card{padding:19px}.path-card h3{font-size:16px}.article-layout{grid-template-columns:minmax(0,1fr) 210px;gap:18px}.article{padding:26px}.article h1{font-size:25px}.aside-card{padding:18px}.aside-card h3{font-size:19px}.mock-layout{padding:28px;gap:25px}.mock-paper{padding:24px}.progress-strip{gap:15px}.progress-intro{font-size:10px}.progress-strip a{display:none}.toast{left:calc(50% + 102px)}}
@media(max-width:980px){.sidebar{width:190px}.brand{font-size:17px;gap:8px}.brand-mark{width:34px;height:38px;font-size:21px}.app-shell{margin-left:190px}main{padding:28px 23px}.topbar{padding:0 23px}.start-art{right:1%;width:46%}.start-copy{min-width:260px;padding-left:25px}.start-copy h2{font-size:28px}.path-grid{gap:12px}.path-card p{font-size:12px}.path-card{padding:18px 15px}.path-number{font-size:25px;right:14px}.free-label{display:none}.lesson-list{grid-template-columns:1fr}.lesson-card{flex-direction:row;align-items:center;gap:19px}.lesson-icon{margin:0;flex-shrink:0;width:51px;height:51px}.lesson-card h3{font-size:18px;margin-top:3px}.lesson-card p{margin:4px 0 8px}.card-arrow{top:50%;bottom:auto;transform:translateY(-50%)}.standalone .lesson-card{min-height:0}.article-layout{grid-template-columns:1fr}.article-aside{display:grid;grid-template-columns:1fr 1fr;gap:20px}.aside-related{margin-top:0}.practice-layout{grid-template-columns:1fr}.practice-guide{display:none}.mock-layout{gap:23px;padding:25px}.mock-details h2{font-size:22px}.mock-paper h2{font-size:23px}.mock-paper{min-height:310px;padding:20px}.mock-paper>strong{font-size:56px}.mock-preview{padding:10px 0}.mock-details>.pill{font-size:10px}.price strong{font-size:46px}h1{font-size:27px}}
@media(max-width:760px){body{font-size:16px}.sidebar{display:none}.app-shell{margin-left:0}.topbar{height:65px;padding:0 19px}.mobile-brand{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:800;letter-spacing:-.03em}.mobile-brand .brand-mark{width:31px;height:35px;font-size:20px}.breadcrumb{display:none}.saved-link{display:none}.top-actions{gap:10px}.sample-badge{font-size:11px}.mobile-nav{display:flex;justify-content:space-around;position:fixed;bottom:0;left:0;right:0;height:calc(66px + env(safe-area-inset-bottom));padding:5px 6px env(safe-area-inset-bottom);border-top:1px solid var(--line);background:#fffffff2;backdrop-filter:blur(15px);z-index:40}.mobile-nav .nav-item{flex-direction:column;gap:2px;padding:6px 10px;margin:0;border-radius:9px;font-size:10px;flex:1;line-height:1.7}.mobile-nav .nav-item.active{background:transparent;color:var(--teal)}.mobile-nav .nav-item.active .icon{background:#e1f1e8;box-shadow:0 0 0 6px #e1f1e8;border-radius:3px;margin-top:3px;margin-bottom:3px}.mobile-nav .icon{width:21px;height:21px}main{padding:26px 20px 18px}h1{font-size:25px;line-height:1.6;letter-spacing:0}.eyebrow{font-size:9px;margin-bottom:7px}.page-heading{margin-bottom:23px}.page-heading p{font-size:12px;line-height:1.9;margin-top:7px}.home-grid{gap:14px}.start-card{min-height:290px}.start-copy{padding:23px 0 23px 22px;min-width:0;width:58%}.start-copy h2{font-size:24px;margin-top:11px}.start-copy p{font-size:12px}.start-copy .button{margin-top:19px;font-size:12px;padding:11px 14px;gap:12px}.start-art{right:-16px;bottom:23px;width:46%}.speech-sticker{font-size:9px;padding:4px 7px;margin-left:6px;white-space:nowrap}.character-labels{padding:0 12px;font-size:9px}.character-labels small{display:none}.quiet-note{font-size:9px}.pill{font-size:10px}.progress-strip{flex-wrap:wrap;justify-content:space-around;gap:5px 13px;padding:17px 0;font-size:10px}.progress-intro{width:100%;justify-content:center;margin:0 0 5px;font-size:10px}.progress-strip strong{font-size:19px}.section{margin-top:29px}.section-heading{margin-bottom:14px;align-items:center}.section-heading h2{font-size:19px}.path-grid{gap:10px}.path-card{padding:17px 12px 15px}.path-number{font-size:20px;top:13px;right:10px}.path-icon{width:35px;height:35px;border-radius:9px;margin-bottom:13px}.path-icon .icon{width:19px;height:19px}.path-card h3{font-size:13px;white-space:nowrap;letter-spacing:0}.path-card p{font-size:10px;line-height:1.8;min-height:54px}.path-card p br{display:none}.path-link{font-size:10px;margin-top:12px;gap:2px}.path-link .icon{width:12px}.lesson-list{gap:12px}.lesson-card{padding:18px;gap:14px}.lesson-icon{width:42px;height:42px;border-radius:10px}.lesson-card h3{font-size:15px}.lesson-card p{font-size:11px}.lesson-card .tag{font-size:9px}.lesson-card>div:nth-child(2){padding-right:12px}.card-arrow{right:12px}.reading-time{font-size:10px}.section-heading .text-link{font-size:11px}.section-heading .text-link .icon{width:14px}.ad-slot{margin-top:28px;min-height:90px}.ad-slot small{font-size:9px}footer{margin:15px 20px 0;padding:22px 0 95px;font-size:10px}.filter-row{gap:8px}.chip{font-size:12px;padding:8px 13px}.filter-count{font-size:11px;width:100%;margin-top:8px}.standalone .lesson-card{padding:21px 18px}.standalone .lesson-card h3{font-size:16px}.standalone .lesson-card p{font-size:12px}.guide-note{padding:17px;gap:12px}.guide-note strong{font-size:13px}.guide-note p{font-size:12px}.article{padding:23px 20px;border-radius:14px}.article h1{font-size:24px}.article-intro{font-size:13px}.article-top{font-size:10px}.article-top .tag{font-size:10px}.article-toolbar{margin:22px 0}.segmented button{padding:9px 10px;font-size:11px}.save-button{font-size:11px;padding:8px;gap:4px}.save-button .icon{width:14px}.speaker{width:41px}.speaker .avatar{width:41px;height:41px}.conversation-row{gap:10px;margin:20px 0}.bubble{font-size:14px;padding:14px 15px;max-width:calc(100% - 51px);line-height:2}.diagram{padding:18px 14px;margin:28px 0 22px}.diagram figcaption{gap:8px}.diagram figcaption strong{font-size:15px}.diagram-step{font-size:10px}.screen-body{padding:18px;min-height:218px}.takeaway{padding:19px}.takeaway p{font-size:14px}.article-bottom{flex-direction:column;align-items:stretch;gap:15px}.article-bottom .button{font-size:13px}.article-bottom>span{font-size:9px}.article-aside{grid-template-columns:1fr}.aside-card h3 br{display:none}.aside-card p br{display:none}.aside-card{padding:22px}.aside-card p{margin:10px 0 16px}.aside-related{padding:0 5px}.cloud-diagram{gap:5px}.diagram-connection>span{font-size:8px}.diagram-device{padding:16px 5px}.diagram-device strong{font-size:11px}.diagram-device small{font-size:10px}.factor-grid{gap:5px}.factor-grid>div{padding:12px 5px}.factor-grid strong{font-size:10px}.factor-grid p{font-size:10px}.practice-panel{padding:24px 20px}.practice-panel h2{font-size:20px}.category-option{padding:14px 11px;gap:10px}.category-option strong{font-size:14px}.category-option small{font-size:10px}.category-symbol{width:35px;height:35px}.category-symbol .icon{width:19px}.quiz-card{padding:25px 20px}.quiz-progress{font-size:10px}.quiz-card legend{font-size:19px;line-height:1.9}.quiz-actions{flex-direction:column;align-items:stretch;margin-top:22px;gap:12px}.hint{max-width:100%}.quiz-actions>.muted{font-size:11px}.feedback h2{font-size:20px}.feedback>p{font-size:14px}.reasons{padding:14px}.reasons p{font-size:12px;gap:10px}.explanation-link{padding:14px;gap:10px}.explanation-link .avatar{width:39px;height:39px}.explanation-link strong{font-size:12px}.quiz-footnote{font-size:11px}.result-card{padding:24px 19px}.result-header h1{font-size:25px}.result-header p{font-size:12px}.score strong{font-size:65px}.result-card>.muted{font-size:11px}.result-breakdown{padding:0}.result-breakdown>div{gap:10px;font-size:11px}.result-breakdown>div>span{width:100px}.result-actions{flex-direction:column}.result-question summary{font-size:13px}.result-question>div{padding-left:0;font-size:13px}.mock-layout{grid-template-columns:1fr;padding:25px 22px;gap:25px}.mock-preview{display:flex;align-items:center;gap:24px;padding:7px 3px}.mock-paper{max-width:190px;min-height:245px;flex:1;padding:20px 17px;box-shadow:6px 8px 0 #dbe7e0,9px 12px 20px #153e3220;border-left-width:5px}.mock-paper>span{font-size:8px}.paper-line{margin:12px 0}.mock-paper h2{font-size:21px}.mock-paper>strong{font-size:40px;margin-top:12px}.mock-paper strong>span{font-size:10px;margin-bottom:7px;margin-left:8px}.paper-bottom{font-size:8px;margin-top:12px}.paper-bottom .icon{width:17px}.mock-features{font-size:11px;gap:15px;margin:0;flex:1}.mock-features>span{gap:6px}.mock-features .icon{width:14px;flex-shrink:0}.mock-details h2{font-size:23px}.mock-details>p{font-size:14px}.price strong{font-size:48px}.mock-note{padding:18px;align-items:start}.mock-note p{font-size:11px}.review-stats{gap:10px;margin:24px 0}.review-stats>div{padding:16px 12px}.review-stats span{font-size:10px}.review-stats strong{font-size:32px}.review-stats small{font-size:11px}.review-section .section-heading{align-items:start;flex-direction:column}.review-section .section-heading h2{font-size:18px}.empty-state{padding:30px 18px}.empty-state h3{font-size:15px}.empty-state p{font-size:12px}.wrong-list{padding:0 15px}.wrong-list button{font-size:13px}.toast{left:50%;bottom:88px;font-size:12px;width:max-content;max-width:calc(100% - 35px)}dialog{padding:30px 24px}.storage-note{font-size:11px}}
@media(max-width:390px){main{padding-left:15px;padding-right:15px}.start-copy h2{font-size:21px}.start-copy{padding-left:18px;width:62%}.start-art{width:45%;right:-20px}.start-copy p{font-size:11px}.start-copy .button{font-size:11px;padding:10px 12px}.speech-sticker{font-size:8px}.path-grid{gap:7px}.path-card{padding:15px 10px}.path-card h3{font-size:12px}.path-link{font-size:9px}.path-number{font-size:18px}.path-card p{font-size:10px}.article{padding:21px 16px}.article h1{font-size:22px}.segmented button{font-size:10px;padding:9px}.bubble{font-size:14px;padding:13px}.mock-preview{gap:18px}.mock-paper{padding:16px 12px}.mock-paper h2{font-size:19px}}
/* Main reading text and frequently used controls keep a legible baseline. */
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