:root{--color-primary:#2d6a4f;--color-primary-light:#40916c;--color-primary-dark:#1b4332;--color-primary-bg:#d8f3dc;--color-primary-bg-soft:#f0f9f2;--color-accent:#e76f51;--color-accent-bg:#e76f511a;--color-text:#1e1e1e;--color-text-muted:#6b7280;--color-text-link:#2d6a4f;--color-bg:#fff;--color-bg-soft:#f9fafb;--color-border:#e5e7eb;--color-border-strong:#d1d5db;--color-shadow:#00000014;--font-sans:"Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;--font-mono:ui-monospace, Consolas, monospace;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-full:9999px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 12px #0000001a;--shadow-lg:0 8px 24px #0000001f;font-family:var(--font-sans);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px;line-height:1.7}@media 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var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);flex-direction:column;flex-shrink:0;align-items:center;gap:2px;min-width:52px;padding:5px 8px;transition:all .15s;display:flex}.word-card__learn-btn:hover{border-color:var(--color-primary-light);background:var(--color-primary-bg-soft)}.word-card__learn-btn.word-card__learn-btn--done{border-color:var(--color-primary);background:var(--color-primary-bg)}.word-card__learn-btn.word-card__learn-btn--done:hover{background:var(--color-primary-bg-soft);border-color:var(--color-primary-dark)}.word-card__learn-icon{color:var(--color-primary);font-size:15px;font-weight:700;line-height:1}.word-card__learn-label{color:var(--color-text-muted);white-space:nowrap;font-size:9px;line-height:1}.word-card__learn-btn--done .word-card__learn-label{color:var(--color-primary-dark)}.word-card__learned-badge{border-radius:var(--radius-full);background:var(--color-primary-bg);color:var(--color-primary-dark);border:1px solid 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ol{align-items:center;gap:6px;margin:0;padding:0;list-style:none;display:flex}.breadcrumb li+li:before{content:"›";color:var(--color-border-strong);margin-right:6px}.breadcrumb a{color:var(--color-text-muted)}.breadcrumb a:hover{color:var(--color-primary)}nav[aria-label=パンくずリスト] ol{color:var(--color-text-muted);align-items:center;gap:6px;margin:0 0 20px;padding:0;font-size:13px;list-style:none;display:flex}nav[aria-label=パンくずリスト] li+li:before{content:"›";margin-right:6px}nav[aria-label=パンくずリスト] a{color:var(--color-text-muted)}nav[aria-label=パンくずリスト] a:hover{color:var(--color-primary);text-decoration:underline}section{margin-top:32px}section h2{color:var(--color-primary-dark);border-bottom:2px solid var(--color-primary-bg);margin-bottom:12px;padding-bottom:8px;font-size:16px;font-weight:700}.detail-section ul{flex-wrap:wrap;gap:8px;display:flex}.detail-section ul li a{border:1.5px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text);padding:4px 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var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);flex-direction:column;flex-shrink:0;align-items:center;gap:3px;padding:8px 14px;transition:all .2s;display:flex}.favorite-button:hover{border-color:var(--color-primary-light);background:var(--color-primary-bg-soft)}.favorite-button.favorite-button--active{border-color:var(--color-primary);background:var(--color-primary-bg)}.favorite-button.favorite-button--active:hover{border-color:var(--color-primary-dark)}.favorite-button__icon{color:var(--color-primary);font-size:18px;font-weight:700;line-height:1}.favorite-button__label{color:var(--color-text-muted);white-space:nowrap;font-size:10px;line-height:1}.favorite-button--active .favorite-button__label{color:var(--color-primary-dark)}.related-articles-compact{border-top:1px solid var(--color-border);margin-top:4px;padding-top:8px}.related-articles-compact__label{color:var(--color-primary);text-transform:uppercase;letter-spacing:.05em;margin:0 0 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16px}.quiz-hint-box__label{color:#d97706;margin-bottom:4px;font-size:12px;font-weight:700}.quiz-hint-box__text{color:var(--color-text);margin:0;font-size:14px;line-height:1.6}.quiz-choices--knowledge .quiz-choice{padding:12px 16px;font-size:13px}.quiz-choice__label{color:var(--color-primary);margin-right:4px;font-weight:700}.quiz-safety-note{border-radius:var(--radius-md);color:#6b1a1a;background:#fef2f2;border:1px solid #fca5a5;margin-top:12px;padding:12px 14px;font-size:12px;line-height:1.6}.quiz-safety-note p{margin:0}.quiz-review-item__safety{color:#b91c1c;margin-top:4px;font-size:11px;line-height:1.5}.quiz-result__mode-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;font-size:12px;font-weight:700}.quiz-result__expert-badge{color:#fff;border-radius:var(--radius-full);background:linear-gradient(135deg,#f59e0b,#d97706);margin-top:10px;padding:6px 16px;font-size:13px;font-weight:700;display:inline-block}.achievements{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.achievement-badge{border-radius:var(--radius-full);color:#92400e;cursor:default;background:linear-gradient(135deg,#fef9c3,#fde68a);border:1px solid #f59e0b;align-items:center;gap:4px;padding:3px 10px;font-size:11px;font-weight:600;display:inline-flex}.achievement-badge__label{font-size:10px}.progress-bar__next-milestone{color:var(--color-primary);font-size:11px}.quiz-start-btn{background:var(--color-primary);color:#fff;border-radius:var(--radius-full);cursor:pointer;border:none;align-items:center;gap:6px;padding:10px 20px;font-size:14px;font-weight:600;transition:background .15s,transform .1s;display:inline-flex}.quiz-start-btn:hover{background:var(--color-primary-dark);transform:translateY(-1px)}--large.quiz-start-btn{border-radius:var(--radius-md);justify-content:center;width:100%;margin-top:24px;padding:14px;font-size:16px}--large.quiz-start-btn:disabled{background:var(--color-border);cursor:not-allowed;transform:none}.quiz-page{max-width:600px;margin:0 auto;padding:24px 16px}.quiz-select{flex-direction:column;gap:12px;display:flex}.quiz-select__label{color:var(--color-text);margin:0;font-size:16px;font-weight:600}.quiz-select__options{gap:12px;display:flex}.quiz-count-btn{border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-text-muted);cursor:pointer;flex:1;padding:16px;font-size:20px;font-weight:700;transition:all .15s}.quiz-count-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}--active.quiz-count-btn{border-color:var(--color-primary);background:var(--color-primary-bg);color:var(--color-primary-dark)}.quiz-header{align-items:center;gap:12px;margin-bottom:28px;display:flex}.quiz-progress{color:var(--color-text-muted);white-space:nowrap;font-size:13px}.quiz-progress-bar{background:var(--color-border);border-radius:var(--radius-full);flex:1;height:6px;overflow:hidden}.quiz-progress-bar__fill{background:var(--color-primary);border-radius:var(--radius-full);height:100%;transition:width .3s}.quiz-question{text-align:center;margin-bottom:24px}.quiz-question__ruby{color:var(--color-text-muted);margin-bottom:4px;font-size:12px}.quiz-question__term{color:var(--color-primary-dark);margin-bottom:8px;font-size:28px;font-weight:700}.quiz-question__prompt{color:var(--color-text-muted);font-size:14px}.quiz-choices{flex-direction:column;gap:10px;margin-bottom:20px;display:flex}.quiz-choice{border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);text-align:left;cursor:pointer;color:var(--color-text);padding:14px 18px;font-size:14px;line-height:1.5;transition:all .15s}.quiz-choice:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-primary-bg-soft)}--correct.quiz-choice{color:#15803d;background:#f0fdf4;border-color:#16a34a;font-weight:600}--wrong.quiz-choice{color:#dc2626;background:#fef2f2;border-color:#dc2626}.quiz-feedback{border-radius:var(--radius-md);background:var(--color-bg-soft);border:1px solid var(--color-border);justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;display:flex}.quiz-feedback--correct{color:#16a34a;font-size:16px;font-weight:700}.quiz-feedback--wrong{color:#dc2626;font-size:16px;font-weight:700}.quiz-next-btn{background:var(--color-primary);color:#fff;border-radius:var(--radius-full);cursor:pointer;white-space:nowrap;border:none;padding:8px 20px;font-size:14px;font-weight:600}.quiz-next-btn:hover{background:var(--color-primary-dark)}.quiz-result{flex-direction:column;gap:24px;display:flex}.quiz-result__score{text-align:center;background:linear-gradient(135deg, var(--color-primary-bg-soft), var(--color-primary-bg));border-radius:var(--radius-lg);border:1px solid var(--color-primary-bg);padding:32px}.quiz-result__label{color:var(--color-text-muted);margin-bottom:8px;font-size:14px}.quiz-result__number{margin:0 0 4px}.quiz-result__correct{color:var(--color-primary-dark);font-size:56px;font-weight:700;line-height:1}.quiz-result__total{color:var(--color-text-muted);font-size:24px}.quiz-result__percent{color:var(--color-primary);margin:4px 0 12px;font-size:20px;font-weight:600}.quiz-result__message{color:var(--color-text);font-size:15px}.quiz-result__actions{flex-direction:column;gap:10px;display:flex}.quiz-share-btns{flex-direction:column;gap:8px;display:flex}.quiz-share-btn{border-radius:var(--radius-md);text-align:center;cursor:pointer;box-sizing:border-box;border:none;width:100%;padding:14px;font-size:15px;font-weight:600;text-decoration:none;transition:background .15s;display:block}.quiz-share-btn--x{color:#fff;background:#000}.quiz-share-btn--x:hover{background:#333;text-decoration:none}.quiz-share-btn--line{color:#fff;background:#06c755}.quiz-share-btn--line:hover{background:#05b04d;text-decoration:none}.quiz-share-btn--native{background:var(--color-bg-soft);color:var(--color-text);border:2px solid var(--color-border)}.quiz-share-btn--native:hover{background:var(--color-primary-bg-soft)}.quiz-mark-btn{background:var(--color-primary-bg);color:var(--color-primary-dark);border:2px solid var(--color-primary-bg);border-radius:var(--radius-md);cursor:pointer;padding:12px;font-size:14px;font-weight:600;transition:all .15s}.quiz-mark-btn:hover{border-color:var(--color-primary);background:var(--color-primary-bg-soft)}.quiz-mark-done{text-align:center;color:var(--color-primary);margin:0;font-size:14px;font-weight:600}.quiz-result__nav{gap:10px;display:flex}.quiz-retry-btn{border:2px solid var(--color-primary);border-radius:var(--radius-md);color:var(--color-primary);cursor:pointer;background:0 0;flex:1;padding:12px;font-size:14px;font-weight:600;transition:all .15s}.quiz-retry-btn:hover{background:var(--color-primary-bg-soft)}.quiz-home-link{background:var(--color-bg-soft);border:2px solid var(--color-border);border-radius:var(--radius-md);text-align:center;color:var(--color-text-muted);flex:1;padding:12px;font-size:14px;font-weight:600;text-decoration:none;transition:all .15s}.quiz-home-link:hover{border-color:var(--color-primary);color:var(--color-primary);text-decoration:none}.quiz-result__answers{border-top:1px solid var(--color-border);padding-top:20px}.quiz-result__answers h3{color:var(--color-text);margin-bottom:12px;font-size:15px}.quiz-review-item{border-radius:var(--radius-md);margin-bottom:8px;padding:10px 14px}--correct.quiz-review-item{background:#f0fdf4;border-left:3px solid #16a34a}--wrong.quiz-review-item{background:#fef2f2;border-left:3px solid #dc2626}.quiz-review-item__term{color:var(--color-text);margin-bottom:2px;font-size:14px;font-weight:600}.quiz-review-item__desc{color:var(--color-text-muted);margin:0;font-size:12px}.contact-page{max-width:560px;margin:0 auto;padding:24px 16px}.contact-form{flex-direction:column;gap:20px;display:flex}.contact-form__field{flex-direction:column;gap:6px;display:flex}.contact-form__label{color:var(--color-text);align-items:center;gap:6px;font-size:14px;font-weight:600;display:flex}.contact-form__required{color:#dc2626;border-radius:var(--radius-sm);background:#fef2f2;padding:2px 6px;font-size:11px;font-weight:600}.contact-form__input,.contact-form__textarea{border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-text);outline:none;padding:10px 14px;font-family:inherit;font-size:15px;transition:border-color .2s}:is(.contact-form__input,.contact-form__textarea):focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #2d6a4f1a}:is(.contact-form__input,.contact-form__textarea)::placeholder{color:var(--color-text-muted)}.contact-form__textarea{resize:vertical;min-height:100px}.contact-form__submit{background:var(--color-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;padding:14px;font-size:15px;font-weight:600;transition:background .15s}.contact-form__submit:hover{background:var(--color-primary-dark)}.contact-thanks{background:var(--color-primary-bg-soft);border-radius:var(--radius-lg);text-align:center;color:var(--color-primary-dark);flex-direction:column;gap:16px;padding:24px;font-size:15px;display:flex}.contact-back-link{color:var(--color-primary);font-size:14px;font-weight:600}.site-footer__links{justify-content:center;align-items:center;gap:8px;margin-bottom:12px;font-size:13px;display:flex}.site-footer__sep{color:var(--color-border-strong)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (prefers-color-scheme:dark){.quiz-knowledge-category,.quiz-hint-btn{color:#fbbf24;background:#2d2000;border-color:#d97706}.quiz-hint-box{background:#2d2000;border-left-color:#f59e0b}.quiz-hint-box__label{color:#fbbf24}.quiz-hint-box__text{color:#f3f4f6}.quiz-safety-note{color:#fca5a5;background:#2d0a0a;border-color:#7f1d1d}.quiz-review-item__safety{color:#fca5a5}}