@import "https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700;900&family=Inter:wght@300;400;500;600;700&display=swap";:root{--primary:#dc2626;--primary-dark:#b91c1c;--primary-light:#fecaca;--secondary:#1e293b;--accent:#f59e0b;--accent-light:#fef3c7;--bg:#fafaf9;--bg-card:#fff;--bg-dark:#1e293b;--text:#1e293b;--text-light:#64748b;--text-muted:#94a3b8;--border:#e2e8f0;--success:#16a34a;--success-light:#dcfce7;--error:#dc2626;--error-light:#fef2f2;--jp-font:"Noto Sans JP", sans-serif;--ui-font:"Inter", "Noto Sans JP", sans-serif;--radius:12px;--radius-sm:8px;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--ui-font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.7}.app{min-height:100vh;display:flex}.sidebar{background:var(--bg-dark);color:#fff;z-index:100;width:280px;padding:0;transition:transform .3s;position:fixed;top:0;bottom:0;left:0;overflow-y:auto}.sidebar-header{border-bottom:1px solid #ffffff1a;padding:24px 20px}.sidebar-header h1{align-items:center;gap:10px;margin:0;font-size:1.3rem;font-weight:700;display:flex}.sidebar-header h1 .flag{font-size:1.5rem}.sidebar-header p{color:#ffffff80;margin-top:4px;font-size:.8rem}.sidebar-nav{padding:12px 0}.nav-section{text-transform:uppercase;letter-spacing:1.5px;color:#ffffff59;padding:8px 20px 4px;font-size:.7rem;font-weight:600}.nav-link{color:#ffffffb3;border-left:3px solid #0000;align-items:center;gap:12px;padding:10px 20px;font-size:.9rem;text-decoration:none;transition:all .2s;display:flex}.nav-link:hover{color:#fff;background:#ffffff14}.nav-link.active{color:#fff;border-left-color:var(--primary);background:#ffffff1a;font-weight:500}.nav-link .nav-icon{text-align:center;width:28px;font-size:1.2rem}.main-content{flex:1;max-width:1000px;margin-left:280px;padding:32px 40px}.mobile-header{background:var(--bg-card);border-bottom:1px solid var(--border);z-index:101;align-items:center;gap:12px;height:52px;padding:0 14px;display:none;position:fixed;top:0;left:0;right:0}.menu-btn{cursor:pointer;color:var(--text);-webkit-tap-highlight-color:transparent;background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;padding:8px;transition:background .15s;display:flex}.menu-btn:active{background:#f1f5f9}.menu-btn svg{display:block}.mobile-header-title{font-family:var(--jp-font);color:var(--text);font-size:1.05rem;font-weight:700}.sidebar-overlay{z-index:99;background:#00000080;display:none;position:fixed;inset:0}@media (width<=768px){.sidebar{visibility:hidden;transform:translate(-100%)}.sidebar.open{visibility:visible;transform:translate(0)}.sidebar-overlay.open{display:block}.mobile-header{display:flex}.main-content{max-width:100%;margin-left:0;padding:66px 14px 32px}}.page-header{margin-bottom:32px}.page-header h2{color:var(--text);font-size:2rem;font-weight:700;font-family:var(--jp-font);margin-bottom:8px}.page-header .subtitle{color:var(--text-light);font-size:1rem;line-height:1.6}.card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:20px;padding:24px}.card-header{align-items:center;gap:12px;margin-bottom:16px;display:flex}.card-header h3{font-size:1.2rem;font-weight:600}.card-header .badge{background:var(--primary-light);color:var(--primary);border-radius:20px;padding:2px 10px;font-size:.75rem;font-weight:600}.card p{color:var(--text-light);white-space:pre-line;font-size:.95rem}.intro-box{border-radius:var(--radius);background:linear-gradient(135deg,#fef2f2 0%,#fff7ed 100%);border:1px solid #fecaca;margin-bottom:28px;padding:28px}.intro-box h3{color:var(--primary-dark);font-size:1.3rem;font-weight:700;font-family:var(--jp-font);margin-bottom:12px}.intro-box p{color:#7c2d12;white-space:pre-line;font-size:.95rem;line-height:1.8}.tips-list{margin-top:16px;padding:0;list-style:none}.tips-list li{color:#7c2d12;padding:6px 0 6px 28px;font-size:.9rem;position:relative}.tips-list li:before{content:"💡";position:absolute;left:0}.char-group{margin-bottom:36px}.char-group>h3{color:var(--primary-dark);font-size:1.15rem;font-weight:600;font-family:var(--jp-font);margin-bottom:8px}.char-group>p{color:var(--text-light);white-space:pre-line;margin-bottom:16px;font-size:.9rem;line-height:1.7}.char-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.char-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;padding:20px;transition:all .2s}.char-card:hover{box-shadow:var(--shadow-md);border-color:var(--primary-light);transform:translateY(-2px)}.char-card .char-display{align-items:baseline;gap:12px;margin-bottom:12px;display:flex}.char-card .main-char{font-size:3.5rem;font-family:var(--jp-font);color:var(--primary);font-weight:700;line-height:1}.char-card .romaji{color:var(--text);font-size:1.3rem;font-weight:600}.char-card .pronunciation{color:var(--text-light);margin-bottom:10px;font-size:.85rem;line-height:1.5}.char-card .mnemonic{background:var(--accent-light);border-radius:var(--radius-sm);color:#92400e;margin-bottom:10px;padding:10px 14px;font-size:.85rem;line-height:1.5}.char-card .examples{margin-top:10px}.char-card .examples span{font-size:.8rem;font-family:var(--jp-font);color:var(--text);background:#f1f5f9;border-radius:6px;margin:2px 4px 2px 0;padding:3px 10px;display:inline-block}.lesson-content{color:var(--text);white-space:pre-line;margin-bottom:24px;font-size:.95rem;line-height:1.85}.key-points{border-radius:var(--radius);background:#f0fdf4;border:1px solid #bbf7d0;margin-bottom:24px;padding:20px}.key-points h4{color:#166534;margin-bottom:10px;font-size:1rem}.key-points ul{padding:0;list-style:none}.key-points li{color:#166534;padding:4px 0 4px 24px;font-size:.9rem;position:relative}.key-points li:before{content:"✓";color:var(--success);font-weight:700;position:absolute;left:0}.example-box{border-left:4px solid var(--primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#f8fafc;margin-bottom:12px;padding:16px 20px}.example-box .jp{font-size:1.2rem;font-family:var(--jp-font);color:var(--text);margin-bottom:4px;font-weight:500}.example-box .rm{color:var(--text-muted);margin-bottom:4px;font-size:.85rem;font-style:italic}.example-box .fr{color:var(--primary-dark);font-size:.95rem;font-weight:500}.example-box .breakdown{color:var(--text-light);border-top:1px dashed var(--border);margin-top:6px;padding-top:6px;font-size:.8rem}.particle-section{border-bottom:1px solid var(--border);margin-bottom:28px;padding-bottom:24px}.particle-section:last-child{border-bottom:none}.particle-header{align-items:center;gap:12px;margin-bottom:12px;display:flex}.particle-char{font-size:2rem;font-family:var(--jp-font);color:var(--primary);background:var(--primary-light);border-radius:12px;justify-content:center;align-items:center;width:52px;height:52px;font-weight:700;display:flex}.particle-header h4{font-size:1rem;font-weight:600}.particle-header .function{color:var(--text-light);font-size:.85rem}.quiz-container{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow-md);border:1px solid var(--border);margin-bottom:24px;padding:32px}.quiz-progress{align-items:center;gap:12px;margin-bottom:24px;display:flex}.quiz-progress-bar{background:#e2e8f0;border-radius:4px;flex:1;height:8px;overflow:hidden}.quiz-progress-fill{background:var(--primary);border-radius:4px;height:100%;transition:width .3s}.quiz-progress-text{color:var(--text-light);white-space:nowrap;font-size:.85rem;font-weight:500}.quiz-question{text-align:center;margin-bottom:28px}.quiz-question .question-char{font-size:3.2rem;font-family:var(--jp-font);color:var(--text);margin-bottom:8px;font-weight:900;line-height:1.1}.quiz-question p{color:var(--text-light);font-size:.95rem}.quiz-options{grid-template-columns:repeat(2,1fr);gap:12px;display:grid}@media (width<=500px){.quiz-options{grid-template-columns:1fr}}.quiz-option{border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);cursor:pointer;font-size:1.05rem;font-family:var(--ui-font);text-align:center;padding:14px 20px;font-weight:500;transition:all .2s}.quiz-option:hover:not(:disabled){border-color:var(--primary);background:#fef2f2}.quiz-option.correct{border-color:var(--success);background:var(--success-light);color:var(--success)}.quiz-option.wrong{border-color:var(--error);background:var(--error-light);color:var(--error)}.quiz-option:disabled{cursor:not-allowed;opacity:.7}.quiz-result{text-align:center;padding:32px}.quiz-result .score{color:var(--primary);margin-bottom:8px;font-size:2.4rem;font-weight:700}.quiz-result p{color:var(--text-light);margin-bottom:20px;font-size:1rem}.btn{border-radius:var(--radius-sm);cursor:pointer;font-size:.95rem;font-weight:500;font-family:var(--ui-font);border:none;justify-content:center;align-items:center;gap:8px;padding:10px 24px;transition:all .2s;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-next{background:var(--primary);color:#fff;margin-top:20px}.vocab-categories{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:32px;display:grid}.vocab-cat-btn{background:var(--bg-card);border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;text-align:center;font-family:var(--ui-font);padding:16px;transition:all .2s}.vocab-cat-btn:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.vocab-cat-btn.active{border-color:var(--primary);background:#fef2f2}.vocab-cat-btn .cat-icon{margin-bottom:8px;font-size:1.8rem;display:block}.vocab-cat-btn .cat-name{color:var(--text);font-size:.85rem;font-weight:600}.vocab-table{border-collapse:separate;border-spacing:0;width:100%;margin-top:20px}.vocab-table th{background:var(--bg-dark);color:#fff;text-align:left;padding:12px 16px;font-size:.85rem;font-weight:600}.vocab-table th:first-child{border-radius:var(--radius-sm) 0 0 0}.vocab-table th:last-child{border-radius:0 var(--radius-sm) 0 0}.vocab-table td{border-bottom:1px solid var(--border);padding:12px 16px;font-size:.9rem}.vocab-table tr:hover td{background:#f8fafc}.vocab-table .jp-col{font-family:var(--jp-font);font-size:1.05rem;font-weight:500}.vocab-table .rm-col{color:var(--text-muted);font-size:.85rem}.vocab-table .note-col{color:var(--text-light);font-size:.8rem;font-style:italic}.vocab-img{object-fit:cover;border-radius:8px;width:44px;height:44px;margin:0 auto;display:block}.kanji-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;display:grid}.kanji-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:all .2s}.kanji-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.kanji-card .kanji-top{align-items:flex-start;gap:16px;margin-bottom:14px;display:flex}.kanji-card .kanji-char{font-size:4rem;font-family:var(--jp-font);color:var(--primary);text-align:center;min-width:80px;font-weight:900;line-height:1}.kanji-card .kanji-info h4{margin-bottom:6px;font-size:1.1rem;font-weight:600}.kanji-card .kanji-readings{color:var(--text-light);font-size:.85rem}.kanji-card .kanji-readings span{display:block}.kanji-card .kanji-visual{background:var(--accent-light);border-radius:var(--radius-sm);color:#92400e;margin-bottom:12px;padding:8px 12px;font-size:.85rem}.kanji-card .kanji-words{flex-wrap:wrap;gap:6px;display:flex}.kanji-card .kanji-word{font-size:.8rem;font-family:var(--jp-font);background:#f1f5f9;border-radius:6px;padding:4px 12px}.dialogue-container{margin-bottom:24px}.dialogue-line{align-items:flex-start;gap:14px;margin-bottom:14px;display:flex}.dialogue-speaker{min-width:70px;color:var(--primary);text-align:right;padding-top:10px;font-size:.8rem;font-weight:600}.dialogue-bubble{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);flex:1;padding:14px 18px}.dialogue-line.you .dialogue-bubble{background:#eff6ff;border-color:#bfdbfe}.dialogue-bubble .jp{font-family:var(--jp-font);color:var(--text);margin-bottom:4px;font-size:1.1rem;font-weight:500}.dialogue-bubble .rm{color:var(--text-muted);margin-bottom:4px;font-size:.8rem;font-style:italic}.dialogue-bubble .fr{color:var(--text-light);font-size:.9rem}.dialogue-notes{border-radius:var(--radius);background:#fffbeb;border:1px solid #fde68a;margin-top:20px;padding:20px}.dialogue-notes h4{color:#92400e;margin-bottom:10px;font-size:.95rem}.dialogue-notes li{color:#78350f;margin-bottom:6px;font-size:.9rem;line-height:1.6}.hero{color:#fff;border-radius:var(--radius);background:linear-gradient(135deg,#dc2626 0%,#9f1239 50%,#1e293b 100%);margin-bottom:32px;padding:48px 36px;position:relative;overflow:hidden}.hero:before{content:"日本語";font-size:10rem;font-family:var(--jp-font);opacity:.1;font-weight:900;line-height:1;position:absolute;top:-20px;right:-20px}.hero h2{margin-bottom:12px;font-size:2.2rem;font-weight:700;position:relative}.hero p{opacity:.9;max-width:600px;font-size:1.05rem;line-height:1.7;position:relative}.module-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;display:grid}.module-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);padding:24px;text-decoration:none;transition:all .2s;display:block}.module-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary-light);transform:translateY(-3px)}.module-card .module-icon{margin-bottom:12px;font-size:2.5rem;display:block}.module-card h3{margin-bottom:6px;font-size:1.1rem;font-weight:600}.module-card p{color:var(--text-light);font-size:.85rem;line-height:1.5}.module-card .module-level{background:var(--primary-light);color:var(--primary-dark);border-radius:20px;margin-top:12px;padding:2px 10px;font-size:.75rem;font-weight:600;display:inline-block}.tabs{border-bottom:2px solid var(--border);gap:4px;margin-bottom:24px;display:flex;overflow-x:auto}.tab{cursor:pointer;color:var(--text-light);white-space:nowrap;font-size:.9rem;font-weight:500;font-family:var(--ui-font);background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-2px;padding:10px 20px;transition:all .2s}.tab:hover{color:var(--text)}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.rule-box{border-radius:var(--radius);background:#fef3c7;border:1px solid #fde68a;margin-bottom:16px;padding:20px}.rule-box h4{color:#92400e;margin-bottom:10px;font-size:1rem}.rule-box p{color:#78350f;white-space:pre-line;font-size:.9rem;line-height:1.8}.rule-box .rule-examples{margin-top:12px;padding:0;list-style:none}.rule-box .rule-examples li{color:#78350f;font-size:.9rem;font-family:var(--jp-font);padding:4px 0 4px 20px;position:relative}.rule-box .rule-examples li:before{content:"→";position:absolute;left:0}.exercise-section{border-radius:var(--radius);background:#f0f9ff;border:1px solid #bae6fd;margin-bottom:20px;padding:24px}.exercise-section h4{color:#0c4a6e;margin-bottom:16px;font-size:1rem}.exercise-item{border-radius:var(--radius-sm);background:#fff;border:1px solid #e0f2fe;margin-bottom:12px;padding:16px}.exercise-item .question{color:var(--text);margin-bottom:8px;font-weight:500}.exercise-item .hint{color:var(--text-muted);margin-bottom:8px;font-size:.85rem;font-style:italic}.exercise-item .answer-reveal{cursor:pointer;color:#fff;font-size:.85rem;font-family:var(--ui-font);background:#0ea5e9;border:none;border-radius:6px;padding:8px 16px;transition:background .2s}.exercise-item .answer-reveal:hover{background:#0284c7}.exercise-item .answer-content{border-top:1px dashed var(--border);margin-top:12px;padding-top:12px}.exercise-item .answer-content .answer-text{font-family:var(--jp-font);color:var(--success);margin-bottom:6px;font-size:1.1rem;font-weight:500}.exercise-item .answer-content .explanation{color:var(--text-light);font-size:.85rem}.loan-word-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-top:16px;display:grid}.loan-word-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px}.loan-word-card .katakana{font-family:var(--jp-font);color:var(--primary);font-size:1.2rem;font-weight:700}.loan-word-card .romaji{color:var(--text-muted);font-size:.8rem}.loan-word-card .meaning{margin-top:4px;font-size:.9rem;font-weight:500}.loan-word-card .origin{color:var(--text-light);font-size:.8rem;font-style:italic}.confusion-pair{border-radius:var(--radius-sm);background:#fef3c7;border:1px solid #fde68a;margin-bottom:12px;padding:16px}.confusion-pair .pair-chars{font-family:var(--jp-font);color:#92400e;margin-bottom:8px;font-size:1.5rem;font-weight:700}.confusion-pair .pair-trick{color:#78350f;font-size:.9rem;line-height:1.6}.scroll-top{background:var(--primary);color:#fff;cursor:pointer;width:44px;height:44px;box-shadow:var(--shadow-lg);z-index:50;border:none;border-radius:50%;justify-content:center;align-items:center;font-size:1.2rem;transition:all .2s;display:flex;position:fixed;bottom:24px;right:24px}.scroll-top:hover{background:var(--primary-dark);transform:translateY(-2px)}.lesson-nav{flex-wrap:wrap;gap:8px;margin-bottom:24px;display:flex}.lesson-nav-btn{border:1px solid var(--border);background:var(--bg-card);cursor:pointer;color:var(--text-light);font-size:.8rem;font-weight:500;font-family:var(--ui-font);border-radius:20px;padding:8px 16px;transition:all .2s}.lesson-nav-btn:hover{border-color:var(--primary);color:var(--primary)}.lesson-nav-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.expression-grid{gap:10px;display:grid}.expression-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);grid-template-columns:1fr 1fr;align-items:center;gap:8px;padding:12px 16px;display:grid}@media (width<=600px){.expression-card{grid-template-columns:1fr}}.expression-card .expr-jp{font-family:var(--jp-font);font-size:1.05rem;font-weight:500}.expression-card .expr-rm{color:var(--text-muted);font-size:.8rem}.expression-card .expr-fr{color:var(--text);font-size:.9rem}.expression-card .expr-note{color:var(--text-light);grid-column:1/-1;font-size:.8rem;font-style:italic}.dakuten-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;display:grid}.dakuten-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);align-items:center;gap:12px;padding:12px 16px;display:flex}.dakuten-card .dk-char{font-family:var(--jp-font);color:var(--primary);text-align:center;min-width:45px;font-size:2rem;font-weight:700}.dakuten-card .dk-info{font-size:.85rem}.dakuten-card .dk-romaji{font-weight:600}.dakuten-card .dk-examples{color:var(--text-light);font-size:.8rem;font-family:var(--jp-font)}.practice-grid{grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px;display:grid}@media (width<=700px){.practice-grid{grid-template-columns:1fr}}.practice-column{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.practice-col-header{border-bottom:1px solid 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