@font-face{font-family:"JetBrains Mono";src:url("assets/fonts/JetBrainsMono-Medium.woff2") format("woff2");font-style:normal;font-weight:500;font-display:swap;}
:root{--font-ui:-apple-system,BlinkMacSystemFont,"JetBrains Mono",system-ui,"Segoe UI",Roboto,"Hiragino Sans","Yu Gothic",Meiryo,monospace;--font-ja:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,"Noto Sans JP",var(--font-ui);--bg:#f5f6ef;--paper:#fffefa;--ink:#203b30;--muted:#68766c;--line:#dce2d6;--green:#2e5847;--lime:#dceba8;--soft:#ebefe5;--wrong:#a94535;--shadow:0 12px 35px #203b3008}
*{box-sizing:border-box}body{font-weight:500;margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-ui);font-size:15px;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #6a9649;outline-offset:4px}h1,h2,h3,p{margin:0}h1{font-size:clamp(38px,4.6vw,64px);letter-spacing:-2.8px;line-height:1.12;font-weight:550}h2{font-size:27px;letter-spacing:-.8px;line-height:1.3}h3{font-size:19px;letter-spacing:-.4px}small{font-size:12px}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}.header{max-width:1440px;margin:auto;padding:26px 5.5%;display:flex;align-items:center;justify-content:space-between;gap:28px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:27px;line-height:1.1;font-weight:650;letter-spacing:-1px}.brand-icon{display:grid;place-items:center;background:var(--green);color:white;border-radius:13px;width:44px;height:48px;font-size:31px}.brand-sub{display:block;font-size:8px;letter-spacing:1.6px;margin-top:6px;font-weight:600}.header nav{display:flex;gap:30px;align-items:center;font-size:13px;font-weight:550}.header nav>a{padding:10px 0;color:var(--muted);position:relative}.header nav>a.active{color:var(--green)}.header nav>a.active:after{content:'';height:2px;background:var(--green);position:absolute;bottom:1px;left:0;right:0}.nav-count{background:#e7ebdf;border-radius:5px;padding:2px 6px;margin-left:3px;font-size:10px}.level-badge{border:1px solid #ccd8c1;border-radius:20px;padding:5px 13px;font-size:11px;white-space:nowrap}.level-badge b{margin-left:5px;font-size:14px}main{max-width:1280px;margin:auto;padding:0 48px 72px;min-height:75vh;outline:none}.hero{display:grid;grid-template-columns:1.45fr 1fr;gap:48px;align-items:center;padding:57px 0 45px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;display:block;margin-bottom:17px;color:var(--muted)}.hero h1 em{font-family:var(--font-ui);font-weight:400;color:#557c53}.hero p{color:var(--muted);max-width:400px;font-size:14px;margin-top:22px;line-height:1.8}.hero-actions{display:flex;gap:18px;align-items:center;margin-top:28px}.button{border:1px solid var(--green);background:var(--green);color:white;display:inline-flex;justify-content:center;align-items:center;gap:10px;border-radius:8px;padding:11px 18px;font-size:12px;font-weight:600;line-height:1.5;transition:background .15s,transform .15s}.button:hover{background:#214332;transform:translateY(-1px)}.button.secondary{background:transparent;color:var(--green);border-color:#cad5c2}.button.secondary:hover{background:#e9efdf}.button.small{padding:8px 12px;font-size:11px}.text-button{border:0;background:none;padding:3px 5px;color:var(--green);font-weight:600;font-size:12px;text-decoration:underline;text-underline-offset:4px}.hero-actions .text-button{text-decoration:none}.illustration{position:relative;min-height:300px;display:grid;place-items:center}.orb{position:absolute;width:285px;height:285px;border-radius:50%;background:#e9edd9;background-image:radial-gradient(#bacba8 1px,transparent 1px);background-size:13px 13px;opacity:.7}.flashcard{width:210px;height:258px;border-radius:10px;background:var(--paper);border:1px solid #d4ddc7;box-shadow:9px 15px 0 #d4dfbd7a;transform:rotate(7deg);position:relative;padding:21px}.flashcard:before{content:'';position:absolute;inset:9px;border:1px solid #e9ecdf;border-radius:5px}.flashcard-label{display:flex;justify-content:space-between;font-size:8px;letter-spacing:1px;color:#829072;position:relative}.flashcard-kanji{font-family:var(--font-ja);text-align:center;font-size:87px;line-height:1.7;font-weight:500}.flashcard-reading{text-align:center;font-size:11px;letter-spacing:2px}.flashcard-meaning{text-align:center;font-size:10px;color:var(--muted);margin-top:8px}.float-note{position:absolute;padding:10px 14px;background:#fdf8e8;border:1px solid #e9dfbd;border-radius:7px;box-shadow:var(--shadow);font-size:10px;transform:rotate(-8deg);left:3%;bottom:31px}.float-note b{color:#657744}.spark{position:absolute;right:11%;top:20px;font-size:35px;color:#9cba71}.hero-caption{position:absolute;right:0;bottom:10px;font-size:9px;letter-spacing:.5px;color:var(--muted)}.stats-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:11px;background:var(--paper);padding:23px 0;margin-bottom:48px}.stat{padding:0 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p{margin-top:7px;color:var(--muted);font-size:12px;line-height:1.8}.quiz-controls{display:flex;justify-content:space-between;gap:15px;margin-top:23px}.question-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:17px 0}.question-dot{border:1px solid var(--line);border-radius:5px;background:var(--paper);padding:8px 2px;font-size:11px;color:var(--ink)}.question-dot.answered{background:#dce8cc;border-color:#bccfa6}.question-dot.current{outline:2px solid var(--green);outline-offset:2px}.quiz-side{padding:21px;background:#eef1e6;border-radius:10px;align-self:start}.quiz-side h3{font-size:14px}.quiz-side p{font-size:11px;color:var(--muted);margin-top:10px}.quiz-side .button{width:100%;margin-top:20px}.progress-track{height:5px;background:#dce3d3;border-radius:10px;overflow:hidden;margin:16px 0 6px}.progress-fill{height:100%;background:var(--green);transition:width .2s}.mode-select{display:flex;gap:8px;margin-top:18px}.mode-select select{padding:7px 10px;border:1px solid var(--line);border-radius:6px;background:var(--paper);font-size:11px;color:var(--ink)}.score-panel{display:flex;align-items:center;gap:30px;border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:28px;margin:24px 0}.score-circle{display:grid;place-items:center;flex-shrink:0;width:112px;height:112px;border-radius:50%;border:8px solid #dce8cc;font-size:29px;letter-spacing:-1px}.score-panel p{color:var(--muted);font-size:12px;margin-top:8px}.result-item{border:1px solid var(--line);border-radius:9px;background:var(--paper);margin-bottom:12px;padding:20px}.result-item h3{font-size:15px;font-family:var(--font-ja);margin:10px 0}.result-item p{font-size:12px;color:var(--muted);margin-top:7px;white-space:pre-line}.result-item .answer-line{color:var(--green);font-size:13px}.error-label{color:var(--wrong)}.history-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0;border-bottom:1px solid var(--line)}.history-row h3{font-size:14px}.history-row p{font-size:11px;color:var(--muted);margin-top:4px}.history-row strong{font-size:18px}.resource-links{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}.resource-links a{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:6px 10px;color:var(--green)}audio{width:100%;margin:12px 0;max-width:500px}footer{display:flex;justify-content:space-between;gap:18px;align-items:center;max-width:1280px;margin:auto;padding:23px 48px;border-top:1px solid var(--line);font-size:9px;color:var(--muted)}.footer-brand{font-size:17px;font-weight:650;color:var(--ink)}.footer-brand span{font-size:10px;margin-left:7px;font-weight:400}footer .text-button{font-size:9px}dialog{max-width:450px;border:1px solid var(--line);border-radius:12px;padding:30px;background:var(--paper);color:var(--ink)}dialog::backdrop{background:#142d235c;backdrop-filter:blur(3px)}dialog p{margin-top:15px;color:var(--muted);font-size:13px}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:25px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:12px 22px;border-radius:8px;background:var(--green);color:white;font-size:12px;box-shadow:var(--shadow);display:none;z-index:10}.skip{position:fixed;top:-100px;left:20px;background:var(--green);color:white;padding:10px;z-index:20}.skip:focus{top:10px}.loading{padding:70px;text-align:center}.privacy-note{font-size:11px;color:var(--muted);margin:15px 0}.section-break{margin-top:35px}
@media(min-width:1450px){main{padding-left:20px;padding-right:20px}.header{padding-left:6%;padding-right:6%}}
@media(max-width:1000px){main{padding:0 28px 50px}.header{padding:22px 28px}.header nav{gap:18px}.library-layout{grid-template-columns:minmax(0,1fr) 220px}.hero{gap:15px}.hero h1{font-size:49px}.stat{padding:0 15px;gap:9px}.stat-icon{display:none}.quiz-layout{grid-template-columns:minmax(0,1fr) 200px}footer{padding:22px 28px;flex-wrap:wrap}}
@media(max-width:760px){.header{flex-wrap:wrap;gap:18px;padding:19px 22px}.header nav{order:3;width:100%;justify-content:space-between;font-size:11px;gap:8px}.brand{font-size:24px}.brand-icon{width:38px;height:41px;font-size:27px}.header nav>a{padding:5px 0}.hero{padding:33px 0;grid-template-columns:1.4fr 1fr;gap:5px}.hero h1{font-size:39px;letter-spacing:-1.5px}.hero p{font-size:12px}.hero .eyebrow{font-size:8px}.illustration{min-height:230px}.orb{width:190px;height:190px}.flashcard{width:145px;height:190px;padding:16px;box-shadow:6px 9px 0 #d4dfbd7a}.flashcard-kanji{font-size:60px}.flashcard-reading{font-size:9px}.flashcard-label{font-size:6px}.float-note{font-size:8px;left:-10px;bottom:10px;padding:7px}.spark,.hero-caption{display:none}.hero-actions{gap:10px;flex-wrap:wrap;margin-top:18px}.hero-actions .button{font-size:11px;padding:9px 12px}.stats-strip{margin-bottom:30px;padding:16px 0}.stat{padding:0 12px}.stat-value{font-size:21px}.stat-label{font-size:9px}.library-layout{display:block}.library-layout aside{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:24px}.sidebar-card{margin:0}.quiz-layout{display:flex;flex-direction:column}.quiz-side{width:100%;order:-1}.quiz-side .question-grid{grid-template-columns:repeat(8,1fr)}.quiz-side .button,.quiz-side>p{display:none}.quiz-side .progress-track{margin-top:12px}.question-card{padding:22px}.question-prompt{font-size:19px}.quiz-bar{padding-top:21px}.quiz-bar h3{font-size:14px}.quiz-layout{gap:16px;margin-top:18px}main{padding:0 22px 40px}footer{padding:20px 22px;gap:12px}.score-panel{padding:20px;gap:20px}.score-circle{width:85px;height:85px;font-size:25px}}
@media(max-width:460px){.hero{grid-template-columns:1fr}.illustration{display:none}.hero h1{font-size:44px}.hero p{max-width:330px}.hero-actions{margin-top:23px}.exam-grid{grid-template-columns:1fr}.filters{gap:6px}.search{width:100%;margin:5px 0 0}.search input{width:100%}.stats-strip{grid-template-columns:1fr 1fr;gap:20px}.stat:nth-child(2){border:0}.library-layout aside{grid-template-columns:1fr}.sidebar-card.white{display:none}.question-prompt{font-size:18px}.option{font-size:14px}.page-top h1{font-size:35px}.section-head h2{font-size:24px}.score-panel{align-items:flex-start}.score-panel h2{font-size:23px}.quiz-bar{flex-wrap:wrap}.timer{font-size:12px}.dialog-actions{flex-wrap:wrap}}
.collection-card{border-top:3px solid #93aa7e}.exam-sections{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-bottom:28px}.exam-sections .exam-card{min-width:0}.archive-resources{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px}.archive-resources .sidebar-card{align-self:start}.document-details{margin-top:22px;font-size:12px}.document-details summary{cursor:pointer;color:var(--green);font-weight:600}.document-details iframe{width:100%;height:650px;border:1px solid var(--line);margin-top:15px;border-radius:8px}.listening-dock{max-width:1184px;margin:20px auto 0;padding:12px 18px;background:#e7eddb;border:1px solid #cad8bb;border-radius:9px;display:flex;align-items:center;justify-content:space-between;gap:20px}.listening-dock[hidden]{display:none}.listening-dock strong{display:block;font-size:12px}.listening-dock span{font-size:10px;color:var(--muted)}.listening-dock audio{margin:0;max-width:480px;height:40px}.paper-mode{grid-template-columns:minmax(0,1fr) 335px;align-items:start}.paper-viewer{min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:9px;padding:13px}.paper-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px}.paper-toolbar label{font-size:10px;white-space:nowrap}.paper-toolbar select{font:inherit;border:1px solid var(--line);border-radius:5px;background:var(--paper);padding:5px;color:var(--ink)}.paper-help{font-size:10px;color:var(--muted);margin:10px 0}.paper-image{display:block;width:100%;height:auto;border:1px solid #e2e5dc;border-radius:4px}.paper-controls{position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto;padding:3px}.paper-answer-card{padding:20px}.paper-answer-card .question-prompt{font-family:var(--font-ui);font-size:14px;letter-spacing:0;line-height:1.8;margin:12px 0}.paper-answer-card .question-instruction{font-size:10px}.paper-answer-card .question-head{flex-wrap:wrap;gap:7px;margin-bottom:12px}.paper-answer-card .options{grid-template-columns:1fr 1fr;gap:7px}.paper-answer-card .option{padding:8px;font-size:11px;gap:7px}.paper-answer-card .option-num{min-width:21px;height:23px;font-size:10px}.paper-answer-card .quiz-controls{flex-wrap:wrap;gap:7px}.paper-answer-card .button{padding:8px 10px;font-size:10px}.paper-controls .quiz-side{margin-top:16px;padding:18px}.reference-note{font-size:10px;color:var(--muted);display:block;white-space:normal}.paper-viewer .resource-links{align-items:center}.quiz-bar h3{max-width:480px;font-size:14px}.exam-sections .card-meta{flex-wrap:wrap;gap:8px}.exam-sections .card-bottom{flex-wrap:wrap;gap:8px}
@media(max-width:1000px){.exam-sections{grid-template-columns:1fr}.exam-sections .exam-card{min-height:auto}.archive-resources{grid-template-columns:1fr}.paper-mode{grid-template-columns:minmax(0,1fr) 290px;gap:17px}.listening-dock{margin:15px 28px 0}.paper-toolbar .button{padding:6px;font-size:9px}.paper-answer-card{padding:15px}}
@media(max-width:760px){.paper-mode{display:flex;flex-direction:column}.paper-controls{position:static;max-height:none;overflow:visible;width:100%;padding:0}.paper-viewer{width:100%}.paper-answer-card .options{grid-template-columns:repeat(4,minmax(0,1fr))}.paper-answer-card .option{justify-content:center;flex-wrap:wrap;gap:5px;font-size:10px}.paper-controls .quiz-side>p{display:block}.paper-controls .quiz-side .button{display:flex}.listening-dock{margin:15px 22px 0;flex-wrap:wrap;gap:10px}.listening-dock audio{max-width:none}.quiz-bar h3{font-size:12px}.document-details iframe{height:450px}}
.header-tools{display:flex;align-items:center;gap:12px;flex-shrink:0}.language-switch select{border:1px solid #ccd8c1;border-radius:7px;background:var(--paper);color:var(--green);font:inherit;font-size:11px;font-weight:500;padding:8px 9px;min-height:36px;cursor:pointer;max-width:130px}.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}html[lang="vi"] .hero h1{font-size:clamp(36px,4.2vw,58px);letter-spacing:-2px}html[lang="vi"] .hero-caption{font-size:8px}html[lang="vi"] .card-bottom{flex-wrap:wrap}html[lang="vi"] .paper-answer-card .option{font-size:10px}html[lang="vi"] .paper-answer-card .quiz-controls{gap:6px}.header nav{min-width:0}.header nav>a{white-space:nowrap}
@media(max-width:1100px){.header{flex-wrap:wrap;gap:18px}.header nav{order:3;width:100%;justify-content:space-between}.header-tools{margin-left:auto}}
@media(max-width:760px){html[lang="vi"] .hero h1{font-size:38px;letter-spacing:-1.5px}.section-head{flex-wrap:wrap}.paper-toolbar{flex-wrap:wrap}.language-switch select{font-size:10px;padding:7px}.quiz-bar{flex-wrap:wrap}}
@media(max-width:460px){.header-tools .level-badge{display:none}.header-tools{gap:0}.header{column-gap:10px}.language-switch select{max-width:112px}.brand-sub{letter-spacing:1px}.header nav{font-size:11px}html[lang="vi"] .hero h1{font-size:40px}.tiny-label{white-space:normal}.paper-answer-card .options{grid-template-columns:repeat(2,minmax(0,1fr))}}