:root{--bg-primary: #f0f4f8;--bg-secondary: #e2e8f0;--bg-tertiary: #cbd5e1;--bg-card: #FFFFFF;--bg-dark: #1e293b;--bg-surface: #f8fafc;--bg-hover: #edf1f7;--text-tertiary: #9ca3af;--border-color-light: #f1f5f9;--accent-primary: #FF6B6B;--accent-primary-rgb: 255, 107, 107;--accent-primary-hover: #e85555;--accent-primary-shadow: #cc584f;--accent-secondary: #a855f7;--accent-secondary-rgb: 168, 85, 247;--accent-secondary-shadow: #9333ea;--accent-tertiary: #ffc800;--text-primary: #374151;--text-secondary: #6b7280;--text-muted: #9ca3af;--text-inverse: #FFFFFF;--success: #1cb0f6;--success-rgb: 28, 176, 246;--warning: #ffc800;--warning-rgb: 255, 200, 0;--error: #ff4b4b;--error-rgb: 255, 75, 75;--info: #1cb0f6;--info-rgb: 28, 176, 246;--word-new: #ffdfe0;--word-new-text: #ff4b4b;--word-learning: #fff4ce;--word-learning-text: #e5a400;--word-known: #e0f2fe;--word-known-text: #0284c7;--word-ignored: #f3f4f6;--level-beginner: #e0f2fe;--level-beginner-text: #0284c7;--level-elementary: #dff4ff;--level-elementary-text: #1899d6;--level-intermediate: #fff4ce;--level-intermediate-text: #e5a400;--level-upper: #ffe3cd;--level-upper-text: #ff7b00;--level-advanced: #ffdfe0;--level-advanced-text: #ff4b4b;--space-2xs: .25rem;--space-xs: .5rem;--space-sm: .75rem;--space-md: 1.25rem;--space-lg: 2rem;--space-xl: 3rem;--space-2xl: 4rem;--space-3xl: 5rem;--font-sans: "Nunito", "Quicksand", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-jp: "Kosugi Maru", "M PLUS Rounded 1c", "Noto Sans JP", sans-serif;--font-cn: "Noto Sans SC", "PingFang SC", sans-serif;--font-ko: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--text-xs: .8125rem;--text-sm: .9375rem;--text-base: 1.0625rem;--text-md: 1.1875rem;--text-lg: 1.3125rem;--text-xl: 1.5rem;--text-2xl: 1.75rem;--text-3xl: 2.25rem;--border-color: #e5e7eb;--border-width: 2px;--border-radius-sm: 12px;--border-radius: 16px;--border-radius-md: 20px;--border-radius-lg: 24px;--border-radius-pill: 999px;--border-radius-round: 50%;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--shadow-md: 0 4px 8px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 16px rgba(0, 0, 0, .1);--shadow-xl: 0 12px 24px rgba(0, 0, 0, .15);--icon-size-xs: 16px;--icon-size-sm: 20px;--icon-size-md: 24px;--icon-size-lg: 32px;--icon-size-xl: 40px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.34, 1.56, .64, 1);--transition-slow: .4s cubic-bezier(.34, 1.56, .64, 1);--transition-spring: .5s cubic-bezier(.175, .885, .32, 1.275);--btn-height-xs: 32px;--btn-height-sm: 40px;--btn-height-md: 48px;--btn-height-lg: 56px;--input-height-sm: 40px;--input-height-md: 48px;--input-height-lg: 56px;--focus-ring: 0 0 0 4px rgba(255, 107, 107, .3);--focus-ring-offset: 2px;--touch-target-min: 48px;--mobile-padding: 20px;--mobile-card-radius: 20px;--safe-area-top: env(safe-area-inset-top, 0px);--safe-area-bottom: env(safe-area-inset-bottom, 0px);--safe-area-left: env(safe-area-inset-left, 0px);--safe-area-right: env(safe-area-inset-right, 0px);--app-height: 100dvh;--bottom-nav-height: 4.25rem;--bottom-nav-safe-area: var(--safe-area-bottom);--bottom-nav-total-height: calc(var(--bottom-nav-height) + var(--bottom-nav-safe-area));--ai-purple: #ce82ff;--ai-pink: #ff79c6;--ai-gradient: linear-gradient(135deg, var(--ai-purple), var(--ai-pink));--z-dropdown: 100;--z-sticky: 200;--z-fixed: 300;--z-modal-backdrop: 400;--z-modal: 500;--z-popover: 600;--z-tooltip: 700;--z-toast: 800;--z-nav: 1000;--z-google-signin: 20000}:root.standalone-mode{--bottom-nav-height: 4rem;--bottom-nav-safe-area: min(var(--safe-area-bottom), 18px)}[data-theme=dark]{--bg-primary: #0f1117;--bg-secondary: #181818;--bg-tertiary: #2a2a2a;--bg-card: #212121;--border-color: #383838;--text-primary: #e5e5e5;--text-secondary: #a3a3a3;--text-muted: #737373;--text-inverse: #171717;--bg-surface: #262626;--bg-hover: #333333;--text-tertiary: #525252;--border-color-light: #2a2a2a;--word-new: rgba(255, 75, 75, .15);--word-new-text: #ff6b6b;--word-learning: rgba(255, 200, 0, .15);--word-learning-text: #ffd54f;--word-known: rgba(28, 176, 246, .15);--word-known-text: #60a5fa;--word-ignored: #2d2d2d;--level-beginner: rgba(2, 132, 199, .15);--level-beginner-text: #38bdf8;--level-elementary: rgba(24, 153, 214, .15);--level-elementary-text: #0ea5e9;--level-intermediate: rgba(229, 164, 0, .15);--level-intermediate-text: #fbbf24;--level-upper: rgba(255, 123, 0, .15);--level-upper-text: #f97316;--level-advanced: rgba(255, 75, 75, .15);--level-advanced-text: #f87171;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .5);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .5), 0 2px 4px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .5), 0 10px 10px -5px rgba(0, 0, 0, .4)}html{min-height:100%}*{box-sizing:border-box;margin:0;padding:0;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent}:root{background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-sans);overflow-x:hidden}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;min-height:var(--app-height, 100dvh);overflow-x:hidden}@supports (-webkit-touch-callout: none){html{height:-webkit-fill-available}body{min-height:-webkit-fill-available}}.text-jp{font-family:var(--font-jp)}.text-cn{font-family:var(--font-cn)}.text-ko{font-family:var(--font-ko)}.text-mono{font-family:var(--font-mono)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;color:var(--text-primary)}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-xl)}h3{font-size:var(--text-lg)}h4{font-size:var(--text-md)}h5{font-size:var(--text-base)}h6{font-size:var(--text-sm)}p{color:var(--text-secondary)}small{font-size:var(--text-sm)}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-fast)}@media (hover: hover){a:hover{color:var(--accent-secondary)}}ruby{ruby-align:center}ruby rt{font-size:.55em;color:var(--text-muted);font-weight:400}.word{cursor:pointer;padding:1px 3px;border-radius:3px;transition:all var(--transition-fast);display:inline}@media (hover: hover){.word:hover{background:var(--accent-tertiary);color:var(--text-primary)}}.word--new{background:var(--word-new);color:var(--word-new-text)}.word--learning{background:var(--word-learning);color:var(--word-learning-text)}.word--known{background:var(--word-known);color:var(--word-known-text)}.word--ignored{background:var(--word-ignored);opacity:.6}#credential_picker_container,.google-one-tap-modal-div{z-index:var(--z-google-signin)!important;position:fixed!important}@media (max-width: 768px){:root{--space-lg: 1rem;--space-xl: 1.5rem}h1{font-size:var(--text-2xl)}h2{font-size:var(--text-lg)}}@media (max-width: 480px){:root{--space-md: 1rem;--space-lg: 1.25rem}h1{font-size:var(--text-xl)}h2{font-size:var(--text-md)}.btn,button:not(.btn-icon),select{min-height:var(--touch-target-min)}.btn-icon{width:var(--touch-target-min);height:var(--touch-target-min)}input::placeholder,textarea::placeholder{font-size:var(--text-sm)}}*{scrollbar-width:thin;scrollbar-color:transparent transparent}*:hover,*:focus-within{scrollbar-color:rgba(0,0,0,.2) transparent}[data-theme=dark] *:hover,[data-theme=dark] *:focus-within{scrollbar-color:rgba(255,255,255,.2) transparent}::-webkit-scrollbar{width:6px;height:6px;background:transparent}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:transparent;border-radius:3px;transition:background .2s ease}*:hover::-webkit-scrollbar-thumb,*:focus-within::-webkit-scrollbar-thumb{background:#0003}*:hover::-webkit-scrollbar-thumb:hover{background:#00000059}[data-theme=dark] *:hover::-webkit-scrollbar-thumb,[data-theme=dark] *:focus-within::-webkit-scrollbar-thumb{background:#fff3}[data-theme=dark] *:hover::-webkit-scrollbar-thumb:hover{background:#ffffff59}html,body{scrollbar-width:none;-ms-overflow-style:none}html::-webkit-scrollbar,body::-webkit-scrollbar{display:none}@media (min-width: 769px){::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}}.container{max-width:100%;margin:0 auto;padding:0 var(--space-lg)}@media (max-width: 480px){.container{padding:0 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var(--border-color)}.bottom-nav__items{display:flex;justify-content:space-around;align-items:center;height:calc(var(--bottom-nav-total-height) - var(--bottom-nav-safe-area));max-width:31.25rem;margin:0 auto;padding:0 var(--space-sm)}.bottom-nav__item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:.25rem .5rem;margin:0;background:none;border:none;color:var(--text-secondary);font-size:.625rem;font-weight:500;cursor:pointer;transition:color var(--transition-fast);min-width:3.5rem;text-decoration:none;position:relative}.bottom-nav__item app-icon{position:relative;width:3rem;height:1.5rem;border-radius:.75rem;display:inline-flex;align-items:center;justify-content:center;transition:transform var(--transition-fast)}.bottom-nav__item app-icon:before{content:"";position:absolute;inset:0;background:rgba(var(--accent-primary-rgb),.15);border-radius:.75rem;transform:scaleX(0);opacity:0;transition:transform .3s cubic-bezier(.2,0,0,1),opacity var(--transition-fast)}.bottom-nav__item.active{color:var(--accent-primary);font-weight:600}.bottom-nav__item.active app-icon{transform:translateY(-2px)}.bottom-nav__item.active app-icon:before{transform:scaleX(1);opacity:1}[data-theme=dark] .bottom-nav__item.active app-icon:before{background:rgba(var(--accent-primary-rgb),.25)}@media (max-width: 768px),(max-height: 500px) and (orientation: landscape){.bottom-nav{display:block}}button{background:none;border:none;padding:0;font-family:inherit;color:inherit;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);height:var(--btn-height-md);padding:0 var(--space-lg);font-family:var(--font-sans);font-size:var(--text-md);font-weight:700;line-height:1;border:2px solid transparent;border-radius:var(--border-radius-lg);cursor:pointer;transition:transform .1s cubic-bezier(.4,0,.2,1),box-shadow .1s cubic-bezier(.4,0,.2,1),background-color .2s;white-space:nowrap;flex-shrink:0;-webkit-user-select:none;user-select:none;letter-spacing:.01em}.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none;filter:grayscale(1)}.btn-primary{background:var(--accent-primary);color:var(--text-inverse);box-shadow:0 4px 0 var(--accent-primary-shadow)}@media (hover: hover){.btn-primary:hover:not(:disabled){background:var(--accent-primary-hover);transform:translateY(-2px);box-shadow:0 6px 0 var(--accent-primary-shadow)}}.btn-primary:active:not(:disabled){transform:translateY(4px)!important;box-shadow:0 0 0 var(--accent-primary-shadow)!important}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:2px solid var(--border-color);box-shadow:0 4px 0 var(--border-color)}@media (hover: hover){.btn-secondary:hover:not(:disabled){background:var(--bg-secondary);transform:translateY(-2px);box-shadow:0 6px 0 var(--border-color)}}.btn-secondary:active:not(:disabled){transform:translateY(4px)!important;box-shadow:0 0 0 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hover){.input-group--icon .clear-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}}.filter-chips{display:flex;align-items:center;gap:var(--space-sm);padding:0 var(--space-md) 6px;margin-bottom:var(--space-md);overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}.filter-chips::-webkit-scrollbar{display:none}.filter-chip{height:36px;display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:0 var(--space-md);font-family:var(--font-sans);font-size:var(--text-sm);font-weight:700;line-height:1;background:var(--bg-card);color:var(--text-secondary);border:2px solid var(--border-color);border-radius:var(--border-radius-pill);box-shadow:0 4px 0 var(--border-color);cursor:pointer;transition:transform .1s cubic-bezier(.4,0,.2,1),box-shadow .1s cubic-bezier(.4,0,.2,1),background-color .2s;white-space:nowrap;flex-shrink:0;-webkit-user-select:none;user-select:none;letter-spacing:.01em}.filter-chips .btn{white-space:nowrap;flex-shrink:0}.filter-chip app-icon{display:flex}.filter-chip.active{background:var(--accent-primary);color:var(--text-inverse);border-color:transparent;box-shadow:0 4px 0 var(--accent-primary-shadow)}@media (hover: hover){.filter-chip:hover:not(.active){background:var(--bg-secondary);transform:translateY(-2px);box-shadow:0 6px 0 var(--border-color)}.filter-chip.active:hover{transform:translateY(-2px);box-shadow:0 6px 0 var(--accent-primary-shadow)}}.filter-chip:active:not(:disabled){transform:translateY(4px)!important;box-shadow:0 0 0 var(--border-color)!important}.filter-chip.active:active:not(:disabled){box-shadow:0 0 0 var(--accent-primary-shadow)!important}.filter-chips__spacer{flex:1}@media (max-width: 600px){.filter-chips .chip-text,.filter-chips .btn .btn-text{display:none}.filter-chips .filter-chip,.filter-chips 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