@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+JP:wght@400;500;700;900&display=swap";:root{--primary: #4f46e5;--primary-light: #818cf8;--primary-dark: #3730a3;--primary-50: #eef2ff;--primary-100: #e0e7ff;--accent: #06b6d4;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--bg: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--shadow-sm: 0 1px 3px rgba(0,0,0,.08);--shadow-md: 0 4px 16px rgba(79,70,229,.12);--shadow-lg: 0 8px 32px rgba(79,70,229,.18);--r-sm: 10px;--r-md: 16px;--r-lg: 24px;--r-xl: 32px;--t-fast: .15s ease;--t-base: .25s ease;--t-slow: .4s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:Inter,Noto Sans JP,sans-serif;background:var(--bg);color:var(--text-primary);line-height:1.6;overflow:hidden;height:100vh}#root{height:100vh;display:flex}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.text-ja{font-family:Noto Sans JP,sans-serif}.text-gradient{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-layout{display:flex;height:100vh;overflow:hidden;width:100%}.sidebar{width:260px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;height:100vh;flex-shrink:0;transition:transform var(--t-slow),width var(--t-slow);z-index:50;position:relative}.sidebar.collapsed{width:0;overflow:hidden}.sidebar-logo{padding:24px 20px 16px;display:flex;align-items:center;gap:10px;color:var(--primary);min-width:260px}.sidebar-logo h1{font-size:20px;font-weight:800;letter-spacing:-.5px}.sidebar-nav{flex:1;padding:8px 12px;display:flex;flex-direction:column;gap:4px;overflow:hidden;min-width:260px}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--r-md);font-size:14.5px;font-weight:500;color:var(--text-secondary);cursor:pointer;border:none;background:transparent;width:100%;text-align:left;transition:all var(--t-fast);white-space:nowrap}.nav-item:hover{background:var(--primary-50);color:var(--primary)}.nav-item.active{background:linear-gradient(135deg,var(--primary),#6366f1);color:#fff;box-shadow:0 4px 12px #4f46e559}.nav-item .badge{margin-left:auto;font-size:10px;font-weight:700;padding:2px 8px;border-radius:99px;background:#ffffff40}.nav-item:not(.active) .badge{background:#fef3c7;color:#92400e}.sidebar-footer{padding:16px 12px;min-width:260px}.user-card{background:var(--primary-50);border:1px solid var(--primary-100);border-radius:var(--r-md);padding:14px;display:flex;align-items:center;gap:12px}.user-avatar{width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:16px;flex-shrink:0}.user-info p{font-size:13px;font-weight:700;color:var(--text-primary)}.user-level{display:inline-block;margin-top:3px;font-size:11px;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:2px 8px;border-radius:99px}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a80;z-index:40}@media (max-width: 768px){.sidebar{position:fixed;left:0;top:0;bottom:0;transform:translate(-100%)}.sidebar.open{transform:translate(0);width:260px}.sidebar-overlay{display:block}}.main-content{flex:1;display:flex;flex-direction:column;height:100vh;overflow:hidden;min-width:0}.topbar{height:64px;background:#ffffffd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:12px;flex-shrink:0;z-index:10}.topbar-title{font-size:17px;font-weight:700;color:var(--text-primary)}.menu-btn{width:40px;height:40px;border-radius:var(--r-sm);border:none;background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:background var(--t-fast)}.menu-btn:hover{background:var(--primary-50);color:var(--primary)}.page-content{flex:1;overflow-y:auto;overflow-x:hidden;padding:28px 28px 120px}@media (max-width: 768px){.page-content{padding:16px 16px 120px}}.page-inner{max-width:1100px;margin:0 auto}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-sm)}.card-p{padding:24px}.card-p-lg{padding:32px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--r-md);border:none;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--t-fast);white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--primary),#6366f1);color:#fff;box-shadow:0 2px 8px #4f46e54d}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 16px #4f46e566}.btn-success{background:var(--success);color:#fff}.btn-success:hover:not(:disabled){background:#059669;transform:translateY(-1px)}.btn-danger{background:var(--danger);color:#fff}.btn-outline{background:transparent;border:1.5px solid var(--border);color:var(--text-secondary)}.btn-outline:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:var(--primary-50)}.btn-ghost{background:var(--primary-50);color:var(--primary)}.btn-ghost:hover:not(:disabled){background:var(--primary-100)}.btn-lg{padding:14px 28px;font-size:16px;border-radius:var(--r-lg)}.btn-sm{padding:6px 14px;font-size:13px}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--r-sm)}.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}@media (min-width: 640px){.stat-grid{grid-template-columns:repeat(4,1fr)}}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:20px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-sm);transition:transform var(--t-fast),box-shadow var(--t-fast)}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-icon{width:48px;height:48px;border-radius:var(--r-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-label{font-size:12px;color:var(--text-muted);font-weight:500}.stat-value{font-size:26px;font-weight:800;color:var(--text-primary);line-height:1.2}.progress-bar{background:#e2e8f0;border-radius:99px;overflow:hidden;height:8px}.progress-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .8s cubic-bezier(.34,1.56,.64,1)}.badge{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:700;padding:3px 10px;border-radius:99px}.badge-dev{background:#fef3c7;color:#92400e}.badge-new{background:#dcfce7;color:#166534}.badge-beta{background:var(--primary-100);color:var(--primary-dark)}.flashcard-wrap{perspective:1200px;flex:1;position:relative}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--r-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 32px;backface-visibility:hidden;transition:opacity .4s ease,transform .4s ease;box-shadow:var(--shadow-sm);cursor:pointer}.flashcard-face.front{transform:rotateY(0)}.flashcard-face.front.flipped{opacity:0;transform:rotateY(180deg);pointer-events:none}.flashcard-face.back{background:linear-gradient(145deg,#fafbff,var(--primary-50));border-color:var(--primary-100);transform:rotateY(-180deg);opacity:0;pointer-events:none}.flashcard-face.back.flipped{opacity:1;transform:rotateY(0);pointer-events:auto}.kanji-main{font-family:Noto Sans JP,sans-serif;font-size:clamp(56px,10vw,96px);font-weight:900;color:var(--text-primary);text-align:center;letter-spacing:4px}.card-kana{font-size:clamp(20px,4vw,32px);color:var(--text-secondary);font-weight:500;margin-top:8px}.card-hv{font-size:clamp(14px,2vw,18px);color:#94a3b8;font-weight:700;letter-spacing:3px;text-transform:uppercase;margin-top:4px}.card-vi{font-size:clamp(24px,5vw,42px);font-weight:800;color:var(--primary);margin-top:12px;text-align:center}.quiz-option{width:100%;text-align:left;padding:14px 20px;border-radius:var(--r-md);border:1.5px solid var(--border);background:var(--surface);cursor:pointer;font-size:15px;font-weight:500;transition:all var(--t-fast);display:flex;align-items:center;gap:12px}.quiz-option:hover{border-color:var(--primary);background:var(--primary-50)}.quiz-option.correct{border-color:var(--success);background:#f0fdf4;color:#166534}.quiz-option.wrong{border-color:var(--danger);background:#fef2f2;color:#991b1b}.quiz-option-label{width:32px;height:32px;border-radius:50%;background:var(--border);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0}.quiz-option.correct .quiz-option-label{background:var(--success);color:#fff}.quiz-option.wrong .quiz-option-label{background:var(--danger);color:#fff}.upload-zone{border:2px dashed var(--border);border-radius:var(--r-xl);padding:60px 32px;text-align:center;cursor:pointer;transition:all var(--t-base);background:var(--surface)}.upload-zone:hover{border-color:var(--primary);background:var(--primary-50)}.chat-overlay{position:fixed;bottom:0;right:0;width:100%;max-width:400px;height:580px;background:var(--surface);border-radius:var(--r-xl) var(--r-xl) 0 0;border:1px solid var(--border);box-shadow:0 -8px 40px #00000026;display:flex;flex-direction:column;z-index:60;overflow:hidden;animation:slideUp .3s ease}@media (min-width: 768px){.chat-overlay{bottom:20px;right:24px;border-radius:var(--r-xl);height:580px}}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.chat-header{background:linear-gradient(135deg,#1e1b4b,var(--primary-dark));color:#fff;padding:14px 16px;display:flex;align-items:center;gap:12px}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.msg{max-width:85%}.msg.user{align-self:flex-end}.msg.ai{align-self:flex-start}.msg-bubble{padding:10px 14px;border-radius:18px;font-size:14px;line-height:1.5}.msg.user .msg-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.msg.ai .msg-bubble{background:#f1f5f9;color:var(--text-primary);border-bottom-left-radius:4px;border:1px solid var(--border)}.chat-input-row{padding:12px;border-top:1px solid var(--border);display:flex;gap:8px;align-items:center;background:var(--surface)}.chat-input{flex:1;background:#f8fafc;border:1.5px solid var(--border);border-radius:var(--r-md);padding:10px 14px;font-size:14px;outline:none;transition:border-color var(--t-fast);font-family:inherit}.chat-input:focus{border-color:var(--primary);background:#fff}.chat-input::placeholder{color:var(--text-muted)}.kanji-panel{width:300px;flex-shrink:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-xl);display:flex;flex-direction:column;overflow:hidden;animation:slideFromRight .3s ease}@keyframes slideFromRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.sheet-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}@media (min-width: 640px){.sheet-grid{grid-template-columns:repeat(3,1fr)}}@media (min-width: 900px){.sheet-grid{grid-template-columns:repeat(4,1fr)}}.sheet-chip{padding:14px;border-radius:var(--r-md);border:2px solid var(--border);cursor:pointer;text-align:center;transition:all var(--t-fast);background:var(--surface)}.sheet-chip:hover{border-color:var(--primary-light);background:var(--primary-50)}.sheet-chip.selected{border-color:var(--primary);background:var(--primary-50);box-shadow:0 0 0 3px #4f46e526}.sheet-chip-name{font-weight:700;font-size:15px;color:var(--text-primary)}.sheet-chip.selected .sheet-chip-name{color:var(--primary)}.sheet-chip-count{font-size:12px;color:var(--text-muted);margin-top:4px}.fab-chat{position:fixed;bottom:24px;right:24px;width:60px;height:60px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px #4f46e573;z-index:40;transition:all var(--t-fast)}.fab-chat:hover{transform:scale(1.1);box-shadow:0 6px 28px #4f46e58c}.dev-state{text-align:center;padding:60px 32px;display:flex;flex-direction:column;align-items:center;gap:16px}.dev-icon{width:80px;height:80px;background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:36px}.dev-title{font-size:22px;font-weight:800;color:var(--text-primary)}.dev-subtitle{color:var(--text-muted);max-width:360px;line-height:1.6}@keyframes spin{to{transform:rotate(360deg)}}.animate-spin{animation:spin 1s linear infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-pulse{animation:pulse 2s ease infinite}@keyframes bounce-in{0%{transform:scale(.8);opacity:0}70%{transform:scale(1.05)}to{transform:scale(1);opacity:1}}.animate-in{animation:bounce-in .3s ease}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.gap-6{gap:24px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mb-6{margin-bottom:24px}.w-full{width:100%}.rounded-full{border-radius:9999px}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.text-center{text-align:center}.font-bold{font-weight:700}.text-sm{font-size:13px}.text-xs{font-size:11px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}