:root{--color-primary:#d74a49;--color-secondary:#2e5c6e;--color-background:#f4f4f0;--color-surface:#fff;--color-text-main:#2b2b2b;--color-text-muted:#666;--color-accent:#eca328;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--border-radius-sm:4px;--border-radius-md:8px;--border-radius-lg:16px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px #0000000d;--shadow-lg:0 10px 15px #0000000d}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--color-background);color:var(--color-text-main);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:Inter,Noto Sans JP,sans-serif}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}.sidebar{background-color:var(--color-surface);z-index:10;border-right:1px solid #0000000d;flex-direction:column;width:260px;height:100vh;transition:transform .3s;display:flex;position:fixed;top:0;left:0}.sidebar-header{padding:var(--spacing-lg);align-items:center;display:flex}.logo-container{align-items:center;gap:var(--spacing-sm);display:flex}.logo-icon{background-color:var(--color-primary);color:#fff;border-radius:var(--border-radius-md);justify-content:center;align-items:center;width:32px;height:32px;font-size:18px;font-weight:700;display:flex}.logo-text{color:var(--color-text-main);letter-spacing:-.02em;font-size:20px;font-weight:700}.sidebar-nav{padding:0 var(--spacing-md);gap:var(--spacing-xs);flex-direction:column;flex:1;display:flex;overflow-y:auto}.nav-section-title{text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-muted);margin-top:var(--spacing-md);margin-bottom:var(--spacing-xs);padding-left:var(--spacing-sm);font-size:11px;font-weight:600}.nav-item{align-items:center;gap:var(--spacing-md);border-radius:var(--border-radius-md);color:var(--color-text-muted);padding:10px 12px;font-size:14px;font-weight:500;transition:all .2s;display:flex}.nav-item:hover{color:var(--color-text-main);background-color:#00000008}.nav-item.active{color:var(--color-primary);background-color:#d74a491a}.nav-divider{height:1px;margin:var(--spacing-md)0;background-color:#0000000d}.sidebar-footer{padding:var(--spacing-md);border-top:1px solid #0000000d}.user-info{align-items:center;gap:var(--spacing-sm);display:flex}.avatar{background-color:var(--color-secondary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-weight:600;display:flex}.user-details{flex-direction:column;display:flex}.user-name{color:var(--color-text-main);font-size:14px;font-weight:600}.user-level{color:var(--color-text-muted);font-size:12px}.kana-page{width:100%;padding-bottom:40px}.kana-back-button{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;align-items:center;gap:8px;margin-bottom:24px;font-size:14px;font-weight:500;transition:color .2s;display:flex}.kana-back-button:hover{color:var(--color-primary)}.kana-header{margin-bottom:32px}.kana-title{background:linear-gradient(135deg,var(--color-text-main)0%,var(--color-primary)100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:8px;font-size:32px;font-weight:800;display:inline-block}.kana-subtitle{color:var(--color-text-muted);font-size:16px}.kana-controls{flex-direction:column;gap:24px;margin-bottom:32px;display:flex}.kana-type-toggles{gap:12px;display:flex}.kana-toggle{cursor:pointer;color:var(--color-text-main);background:#fff;border:1px solid #0000000d;border-radius:12px;padding:12px 24px;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 4px #00000005}.kana-toggle:hover{transform:translateY(-2px);box-shadow:0 4px 8px #0000000d}.kana-toggle.active-hiragana{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.kana-toggle.active-katakana{background:var(--color-secondary);color:#fff;border-color:var(--color-secondary)}.kana-tabs{border-bottom:1px solid #0000000d;flex-wrap:wrap;gap:8px;padding-bottom:8px;display:flex}.kana-tab{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;border-radius:10px;padding:10px 20px;font-size:14px;font-weight:500;transition:all .2s}.kana-tab:hover{color:var(--color-text-main);background:#00000005}.kana-tab.active{background:#f0f0f0;background:rgba(var(--color-primary-rgb,0,0,0),.05);color:var(--color-primary);font-weight:700}.kana-guide-layout{grid-template-columns:2fr 1fr;align-items:start;gap:24px;animation:.4s ease-out fadeIn;display:grid}.kana-guide-main{flex-direction:column;gap:24px;display:flex}.kana-guide-sidebar{flex-direction:column;gap:24px;display:flex;position:sticky;top:24px}@media (max-width:900px){.kana-guide-layout{grid-template-columns:1fr}.kana-guide-sidebar{position:static}}.guide-card{box-shadow:var(--shadow-sm);background:#fff;border:1px solid #0000000d;border-radius:16px;padding:32px}.guide-card-title{color:var(--color-text-main);align-items:center;gap:12px;margin-bottom:24px;font-size:20px;font-weight:700;display:flex}.guide-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;display:grid}.guide-sub-card{border:1px solid #00000008;border-radius:12px;padding:24px;transition:transform .2s}.guide-sub-card:hover{transform:translateY(-2px)}.guide-grid-title{margin-bottom:12px;font-size:18px;font-weight:700}.guide-grid-desc{color:var(--color-text-muted);margin-bottom:16px;font-size:14px;line-height:1.5}.guide-grid-examples{letter-spacing:.1em;font-size:20px;font-weight:500}.guide-chart-container{background:#f8fafc;border:1px solid #00000008;border-radius:12px;padding:24px;font-family:SF Mono,Roboto Mono,monospace;font-size:16px;line-height:2.2}.guide-tip{color:var(--color-accent);align-items:center;gap:8px;margin-top:16px;font-size:14px;font-weight:600;display:flex}.guide-cta{background:linear-gradient(135deg,var(--color-primary)0%,#b83a39 100%);color:#fff;text-align:center;border-radius:16px;padding:32px;box-shadow:0 10px 25px #dc262633}.cta-buttons{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:24px;display:flex}.cta-btn{cursor:pointer;border:none;border-radius:10px;flex:1;padding:12px 24px;font-size:14px;font-weight:700;transition:transform .2s}.cta-btn:hover{transform:scale(1.02)}.cta-btn-primary{color:var(--color-primary);background:#fff}.cta-btn-secondary{color:#fff;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#fff3}.sidebar-tip{background:#fff1f0;border:1px solid #d74a491a;border-radius:16px;padding:24px}.chart-layout{grid-template-columns:1fr 300px;align-items:start;gap:32px;animation:.4s ease-out fadeIn;display:grid}@media (max-width:1000px){.chart-layout{grid-template-columns:1fr}}.chart-grid{grid-template-columns:repeat(auto-fit,minmax(360px,1fr));gap:24px;width:100%;display:grid}.chart-grid.list-view{grid-template-columns:1fr}.chart-row{background:#fff;border:1px solid #0000000d;border-radius:16px;padding:20px}.chart-row-label{text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-muted);margin-bottom:12px;font-size:12px;font-weight:600}.chart-row-items{flex-wrap:wrap;gap:10px;display:flex}.kana-char-btn{width:64px;height:64px;color:var(--color-text-main);cursor:pointer;background:#fff;border:2px solid #0000;border-radius:16px;place-items:center;font-size:28px;font-weight:700;transition:all .2s cubic-bezier(.4,0,.2,1);display:grid;box-shadow:0 4px 6px #00000005}.kana-char-btn:hover{border-color:#0000001a;transform:translateY(-4px);box-shadow:0 8px 15px #0000000d}.kana-char-btn.active-h{background:var(--color-primary);color:#fff;box-shadow:0 8px 20px #dc26264d}.kana-char-btn.active-k{background:var(--color-secondary);color:#fff;box-shadow:0 8px 20px #2e5c6e4d}.chart-detail-panel{text-align:center;background:#fff;border:1px solid #0000000d;border-radius:24px;flex:250px;align-self:flex-start;padding:40px;position:sticky;top:32px;box-shadow:0 20px 40px -10px #0000001a}.detail-char{margin-bottom:24px;font-size:120px;font-weight:900;line-height:1}.detail-romaji-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.1em;font-size:13px;font-weight:600}.detail-romaji{color:var(--color-text-main);font-size:40px;font-weight:800}.text-primary{color:var(--color-primary)}.text-secondary{color:var(--color-secondary)}.simple-grid-container{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;animation:.4s ease-out fadeIn;display:grid}.vocab-card{cursor:default;background:#fff;border:1px solid #0000000d;border-radius:16px;padding:24px;transition:all .2s}.vocab-card:hover{transform:translateY(-4px);box-shadow:0 10px 20px #0000000d}.vocab-word{color:var(--color-text-main);margin-bottom:8px;font-size:32px;font-weight:800}.vocab-reading{color:var(--color-text-muted);margin-bottom:8px;font-size:14px;font-weight:500}.vocab-meaning{font-size:16px;font-weight:600}.practice-container{text-align:center;max-width:480px;margin:40px auto;animation:.5s ease-out slideUp}.practice-header{justify-content:space-between;align-items:center;margin-bottom:24px;font-weight:600;display:flex}.practice-progress-bar{background:#f1f5f9;border-radius:99px;height:8px;margin-bottom:40px;overflow:hidden}.practice-progress-fill{border-radius:99px;height:100%;transition:width .3s}.practice-card{background:#fff;border:1px solid #0000000d;border-radius:32px;flex-direction:column;justify-content:center;align-items:center;min-height:400px;margin-bottom:32px;padding:60px 40px;display:flex;box-shadow:0 20px 50px -10px #0000001a}.practice-char{margin-bottom:32px;font-size:120px;font-weight:900;line-height:1}.practice-reveal-btn{background:var(--color-secondary);color:#fff;cursor:pointer;border:none;border-radius:16px;padding:18px 40px;font-size:18px;font-weight:700;transition:transform .2s;box-shadow:0 4px 12px #2e5c6e4d}.practice-reveal-btn:hover{transform:translateY(-2px)}.practice-answer{width:100%;animation:.3s ease-out fadeIn}.practice-romaji{color:var(--color-text-main);margin-bottom:32px;font-size:48px;font-weight:800}.practice-actions{justify-content:center;gap:16px;width:100%;display:flex}.practice-action-btn{cursor:pointer;border:none;border-radius:14px;flex:1;padding:16px;font-size:16px;font-weight:700;transition:transform .1s}.practice-action-btn:hover{transform:scale(1.02)}.quiz-options{flex-direction:column;gap:12px;width:100%;max-width:320px;margin:0 auto;display:flex}.quiz-btn{color:var(--color-text-main);cursor:pointer;background:#fff;border:2px solid #0000000d;border-radius:12px;padding:16px;font-size:18px;font-weight:700;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 6px #00000005}.quiz-btn:hover:not(:disabled){border-color:#0000001a;transform:translateY(-2px);box-shadow:0 8px 12px #0000000d}.quiz-btn:active:not(:disabled){transform:translateY(0)}.quiz-btn.correct{color:#166534;background:#dcfce7;border-color:#86efac}.quiz-btn.incorrect{color:#991b1b;background:#fee2e2;border-color:#fca5a5}.quiz-btn:disabled{cursor:default}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.extended-group{background:#fff;border:1px solid #0000000d;border-radius:20px;margin-bottom:24px;padding:32px}.extended-row{flex-wrap:wrap;gap:12px;margin-bottom:16px;display:flex}.extended-char-box{text-align:center;background:#f8fafc;border-radius:12px;width:60px;padding:8px 0}.extended-char{color:var(--color-text-main);font-size:24px;font-weight:700}.extended-romaji{color:var(--color-text-muted);font-size:12px;font-weight:500}:root{--vp-c-bg:#fff;--vp-c-bg-soft:#f9f9f9;--vp-c-bg-alt:#f6f6f7;--vp-c-text-1:#213547;--vp-c-text-2:#3c3c43c7;--vp-c-text-3:#3c3c438c;--vp-c-brand:var(--color-primary);--vp-c-brand-light:#e06c75;--vp-c-brand-dark:#b83a39;--vp-c-divider:#3c3c431f;--vp-shadow-1:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;--vp-shadow-2:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d;--vp-font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif}.landing-page{font-family:var(--vp-font-family);background-color:var(--vp-c-bg);color:var(--vp-c-text-1);min-height:100vh;position:relative;overflow-x:hidden}.landing-bg-layer{z-index:0;pointer-events:none;background-image:radial-gradient(circle,#fffc 0%,#0000 100%),linear-gradient(#00000008 1px,#0000 1px),linear-gradient(90deg,#00000008 1px,#0000 1px);background-size:100% 100%,40px 40px,40px 40px;width:100%;height:100%;position:absolute;top:0;left:0;overflow:hidden}.landing-bg-layer:before{content:"";background:radial-gradient(circle,var(--vp-c-brand-light)0%,transparent 70%);opacity:.15;filter:blur(80px);width:60%;height:60%;animation:20s ease-in-out infinite alternate floatOrb;position:absolute;top:-20%;right:-10%}.landing-bg-layer:after{content:"";opacity:.12;filter:blur(80px);background:radial-gradient(circle,#4facfe 0%,#0000 70%);width:50%;height:50%;animation:25s ease-in-out infinite alternate-reverse floatOrb;position:absolute;bottom:-10%;left:-10%}@keyframes floatOrb{0%{transform:translate(0)scale(1)}50%{transform:translate(-30px,20px)scale(1.1)}to{transform:translate(20px,-30px)scale(.9)}}.landing-header{z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--vp-c-divider);background:#ffffffd9;height:64px;position:sticky;top:0}.header-container{justify-content:space-between;align-items:center;max-width:1152px;height:100%;margin:0 auto;padding:0 24px;display:flex}.brand{cursor:pointer;align-items:center;gap:10px;transition:opacity .2s;display:flex}.brand:hover{opacity:.8}.brand-icon{background:linear-gradient(120deg,var(--vp-c-brand),var(--vp-c-brand-light));color:#fff;border-radius:8px;justify-content:center;align-items:center;width:32px;height:32px;font-size:18px;font-weight:700;display:flex}.brand-text{color:var(--vp-c-text-1);font-size:18px;font-weight:600}.header-nav{gap:24px;display:flex}@media (max-width:768px){.header-nav{display:none}}.nav-link{color:var(--vp-c-text-2);cursor:pointer;background:0 0;border:none;padding:0;font-size:14px;font-weight:500;transition:color .2s}.nav-link:hover{color:var(--vp-c-brand)}.header-actions{align-items:center;gap:16px;display:flex}.btn-login{color:var(--vp-c-text-2);cursor:pointer;background:0 0;border:none;font-size:14px;font-weight:500;transition:color .2s}.btn-login:hover{color:var(--vp-c-brand)}.btn-register{background:var(--vp-c-brand);color:#fff;cursor:pointer;border:none;border-radius:20px;padding:6px 16px;font-size:14px;font-weight:600;transition:background-color .2s}.btn-register:hover{background-color:var(--vp-c-brand-dark)}.hero-section{max-width:1152px;margin:0 auto;padding:64px 24px;position:relative;overflow:hidden}.hero-section:before{content:"";pointer-events:none;z-index:-1;background-image:linear-gradient(#00000008 1px,#0000 1px),linear-gradient(90deg,#00000008 1px,#0000 1px);background-size:32px 32px;width:100%;height:100%;position:absolute;top:0;left:0;-webkit-mask-image:linear-gradient(#0000,#000 10% 90%,#0000);mask-image:linear-gradient(#0000,#000 10% 90%,#0000)}@media (min-width:960px){.hero-section{padding:96px 32px}}.hero-content{flex-direction:column;align-items:center;gap:48px;display:flex}@media (min-width:960px){.hero-content{text-align:left;flex-direction:row;justify-content:space-between;align-items:center;gap:64px}.hero-text-container{flex-direction:column;flex:1;align-items:flex-start;max-width:600px;display:flex}.hero-title-wrapper{margin:0}}.hero-title-wrapper{max-width:800px}.hero-title{letter-spacing:-.02em;color:var(--vp-c-text-1);margin-bottom:16px;font-size:32px;font-weight:800;line-height:1.25}@media (min-width:640px){.hero-title{font-size:48px}}@media (min-width:960px){.hero-title{font-size:56px;line-height:1.15}}.gradient-text{background:-webkit-linear-gradient(315deg,var(--vp-c-brand)30%,var(--vp-c-brand-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.hero-desc{color:var(--vp-c-text-2);max-width:580px;margin:0 auto;font-size:18px;line-height:1.6}@media (min-width:960px){.hero-desc{margin:0;font-size:20px}}.hero-buttons{flex-wrap:wrap;justify-content:center;gap:16px;margin-top:24px;display:flex}@media (min-width:960px){.hero-buttons{justify-content:flex-start}}.vp-button{cursor:pointer;border:none;border-radius:20px;justify-content:center;align-items:center;height:48px;padding:0 24px;font-size:16px;font-weight:600;text-decoration:none;transition:all .25s;display:inline-flex}.vp-button.primary{background-color:var(--vp-c-brand);color:#fff}.vp-button.primary:hover{background-color:var(--vp-c-brand-dark);transform:translateY(-2px)}.vp-button.secondary{background-color:var(--vp-c-bg-alt);color:var(--vp-c-text-1)}.vp-button.secondary:hover{background-color:#eaeaea}.hero-image-container{flex:1;justify-content:center;width:100%;display:flex;position:relative}@media (min-width:960px){.hero-image-container{justify-content:flex-end}}.hero-image-glow{background:var(--vp-c-brand);opacity:.12;filter:blur(90px);z-index:0;border-radius:50%;width:250px;height:250px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.features-section{z-index:1;background-color:#0000;padding:64px 24px;position:relative}.section-container{max-width:1152px;margin:0 auto}.features-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;display:grid}.feature-card{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background-color:#fffc;border:1px solid #00000014;border-radius:16px;height:100%;padding:24px;transition:all .3s;box-shadow:0 4px 20px #00000008}.feature-card:hover{border-color:var(--vp-c-brand-light);background-color:#fff;transform:translateY(-4px);box-shadow:0 12px 30px #00000014}.feature-icon-box{background-color:var(--vp-c-bg-alt);width:48px;height:48px;color:var(--vp-c-brand);border-radius:12px;justify-content:center;align-items:center;margin-bottom:20px;transition:all .3s;display:flex}.feature-card:hover .feature-icon-box{background-color:var(--vp-c-brand);color:#fff;transform:scale(1.1)rotate(5deg)}.feature-title{color:var(--vp-c-text-1);margin-bottom:8px;font-size:16px;font-weight:600}.feature-desc{color:var(--vp-c-text-2);font-size:14px;line-height:1.6}.vp-footer{text-align:center;border-top:1px solid var(--vp-c-divider);background-color:var(--vp-c-bg);padding:32px 24px}.footer-text{color:var(--vp-c-text-3);font-size:14px;line-height:1.5}
