:root{color-scheme:light;--color-bg: #faf8f5;--color-surface: #ffffff;--color-surface-alt: #f5f2eb;--color-text: #1f2933;--color-muted: #5f6b7a;--color-border: #e6e2da;--color-primary: #1e2a3b;--color-primary-strong: #0f172a;--color-accent: #bc002d;--color-success: #216e4e;--color-warning: #8a5a00;--color-error: #a33030;--shadow-sm: 0 1px 3px rgb(31 41 51 / .06), 0 1px 2px rgb(31 41 51 / .04);--radius-sm: 6px;--radius-md: 10px;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 3rem;--font-sans: "Noto Sans JP", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--content: 72rem;--measure: 44rem}@media(prefers-color-scheme:dark){:root{color-scheme:dark;--color-bg: #0d1117;--color-surface: #161b22;--color-surface-alt: #21262d;--color-text: #f0f6fc;--color-muted: #8b949e;--color-border: #30363d;--color-primary: #ea5b5b;--color-primary-strong: #ff8b8b;--color-accent: #ea5b5b;--shadow-sm: none}}*{box-sizing:border-box}html{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);line-height:1.6;text-rendering:optimizeLegibility}body{margin:0;min-width:320px}img,svg{max-width:100%}a{color:var(--color-primary-strong);text-underline-offset:.18em}a:hover{text-decoration-thickness:.14em}:focus-visible{outline:3px solid var(--color-primary);outline-offset:3px}.skip-link{position:absolute;left:var(--space-4);top:var(--space-4);z-index:10;transform:translateY(-150%);background:var(--color-surface);border:2px solid var(--color-primary);padding:var(--space-2) var(--space-3)}.skip-link:focus{transform:translateY(0)}.site-shell{min-height:100vh;display:flex;flex-direction:column}.site-main{flex:1}.container{width:min(100% - 2rem,var(--content));margin-inline:auto}.measure{max-width:var(--measure)}.site-header{border-bottom:1px solid var(--color-border);background:color-mix(in srgb,var(--color-bg) 88%,var(--color-surface))}.site-header__inner,.site-footer__inner{width:min(100% - 2rem,var(--content));margin-inline:auto}.site-header__inner{min-height:4.25rem;display:flex;align-items:center;gap:var(--space-4);justify-content:space-between}.brand{display:inline-flex;align-items:center;color:var(--color-text);font-weight:800;letter-spacing:.08em;text-transform:uppercase;font-size:1.1rem;text-decoration:none;min-height:44px;position:relative;transition:color .2s ease}.brand:after{content:"";position:absolute;bottom:6px;left:0;width:100%;height:2px;background-color:var(--color-accent);transform:scaleX(0);transform-origin:left;transition:transform .25s ease-out}.brand:hover{color:var(--color-text)}.brand:hover:after{transform:scaleX(1)}.nav{display:flex;align-items:center;gap:var(--space-3);font-size:.95rem}.nav a,.language-switcher a{min-height:44px;display:inline-flex;align-items:center}.nav a{color:var(--color-text);text-decoration:none}.nav a:hover{color:var(--color-primary-strong);text-decoration:underline}.cta,button,.button{min-height:44px;border:1.5px solid var(--color-primary);background:var(--color-primary);color:#fff;border-radius:var(--radius-sm);padding:.66rem .95rem;font:inherit;font-weight:700;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);cursor:pointer;transition:all .2s cubic-bezier(.16,1,.3,1)}.cta:hover,button:hover,.button:hover{background:var(--color-primary-strong);border-color:var(--color-primary-strong);transform:translateY(-1px);box-shadow:0 4px 12px #1f29331f}.cta:active,button:active,.button:active{transform:translateY(0);box-shadow:none}.nav a.cta{color:#fff}.nav 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#bc002d26}.language-card{display:flex!important;flex-direction:row!important;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-5)!important;text-decoration:none;color:inherit;transition:all .2s cubic-bezier(.16,1,.3,1)!important}.language-card:hover{border-color:var(--color-accent)!important;transform:translateY(-2px);box-shadow:0 4px 16px #1f293314}.language-card__flag{font-size:2.4rem;line-height:1;flex-shrink:0}.language-card h3{margin:0 0 var(--space-1)!important;font-size:1.15rem}.language-card p{margin:0!important;font-size:.88rem;color:var(--color-muted);line-height:1.4}.hero{padding:var(--space-7) 0 var(--space-6);border-bottom:1px solid var(--color-border);background:var(--color-surface-alt)}.hero__grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(18rem,.65fr);gap:var(--space-6);align-items:center}.eyebrow{margin:0 0 var(--space-2);color:var(--color-primary-strong);font-weight:800;letter-spacing:0;text-transform:uppercase;font-size:.82rem}h1,h2,h3{line-height:1.18;letter-spacing:0;margin:0 0 var(--space-3)}h1{font-size:clamp(2rem,8vw,3.6rem);max-width:11ch}h2{font-size:clamp(1.55rem,4vw,2.2rem)}h3{font-size:1.18rem}p{margin:0 0 var(--space-4)}.lead{font-size:1.15rem;color:var(--color-muted);max-width:42rem}.actions{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-5)}.stats-panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-5);box-shadow:var(--shadow-sm)}.stats-panel dl{display:grid;gap:var(--space-3);margin:0}.stats-panel div{display:flex;justify-content:space-between;gap:var(--space-4);border-bottom:1px solid var(--color-border);padding-bottom:var(--space-2)}.stats-panel div:last-child{border-bottom:0;padding-bottom:0}.section{padding:var(--space-7) 0}.section+.section{border-top:1px solid 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ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:var(--space-2)}.breadcrumbs li:not(:last-child):after{content:"/";color:var(--color-muted);margin-left:var(--space-2)}.notice{border-left:4px solid var(--color-primary)}.notice.warning{border-left-color:var(--color-warning)}.notice.error{border-left-color:var(--color-error)}.source-list{padding-left:1.2rem}.faq-list details{border-top:1px solid var(--color-border);padding:var(--space-3) 0}.faq-list summary{cursor:pointer;font-weight:750;min-height:44px;display:flex;align-items:center}.ad-slot{min-height:9rem;border:1px dashed var(--color-border);border-radius:var(--radius-sm);display:grid;place-items:center;color:var(--color-muted);background:var(--color-surface-alt);margin:var(--space-5) 0}.quiz-controls,.quiz-nav,.form-grid{display:flex;flex-wrap:wrap;align-items:end;gap:var(--space-3)}.field{display:grid;gap:var(--space-1)}label{font-weight:700}select,input,textarea{min-height:44px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);padding:.55rem .7rem;font:inherit}.question-options{display:grid;gap:var(--space-2);margin:var(--space-4) 0}.answer-option{display:grid;grid-template-columns:1.4rem 1fr;gap:var(--space-3);align-items:start;border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:var(--space-3)}.answer-option input{min-height:auto;margin-top:.25rem}.answer-option.correct{border-color:var(--color-success)}.answer-option.incorrect{border-color:var(--color-error)}.progress-bar{height:.75rem;border-radius:999px;background:var(--color-surface-alt);overflow:hidden;border:1px solid var(--color-border)}.progress-bar>span{display:block;height:100%;width:var(--value, 0%);background:var(--color-primary)}.score-ring{width:7rem;height:7rem}.flashcard{min-height:12rem;display:grid;place-items:center;text-align:center;border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-5);background:var(--color-surface-alt);font-size:1.35rem;font-weight:750}.vocabulary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4)}.japanese-term{font-size:1.7rem;font-weight:800}.site-footer{border-top:1px solid var(--color-border);padding:var(--space-6) 0;background:var(--color-surface)}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:var(--space-5)}.footer-links{display:grid;gap:var(--space-2)}.muted{color:var(--color-muted)}.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}@media(max-width:920px){.hero__grid,.grid,.grid.two,.footer-grid,.vocabulary-grid{grid-template-columns:1fr}.desktop-nav{display:none}.mobile-menu{display:block}.mobile-menu summary{min-height:44px;display:inline-flex;align-items:center;border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:0 var(--space-3);cursor:pointer}.mobile-menu[open] .nav{position:absolute;left:1rem;right:1rem;top:4.5rem;z-index:5;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-4);display:grid;box-shadow:var(--shadow-sm)}.site-header__inner{gap:var(--space-2)}.brand span{max-width:8rem}}@media(max-width:560px){h1{font-size:2.15rem}.container,.site-header__inner,.site-footer__inner{width:min(100% - 1rem,var(--content))}.card,.notice,.quiz-app,.flashcard-deck,.progress-panel,.stats-panel{padding:var(--space-4)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}