@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700;9..144,800&display=swap";:root{color-scheme:light;--bg: #faf7f2;--bg-elev: #ffffff;--bg-soft: #f3ede2;--ink: #1d1b18;--ink-soft: #5b574f;--ink-faint: #8e8a82;--primary: #b3411b;--primary-soft: #fde6dc;--primary-ink: #6c2510;--primary-grad: linear-gradient(135deg, #b3411b, #d4724b);--accent: #2f6e6b;--accent-soft: #d8ece9;--success: #2e7d32;--success-soft: #dff3df;--warning: #b8860b;--warning-soft: #fbeec5;--danger: #c62828;--danger-soft: #fadbd8;--border: #e7dfd1;--border-strong: #d3c9b6;--shadow-sm: 0 1px 2px rgba(40, 30, 15, .05);--shadow-md: 0 4px 12px rgba(40, 30, 15, .08);--shadow-lg: 0 12px 32px rgba(40, 30, 15, .1);--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-display: "Fraunces", Georgia, serif}*{box-sizing:border-box}html,body{margin:0;padding:0}html{height:100%}body{font-family:var(--font-sans);background:var(--bg);color:var(--ink);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100svh;overscroll-behavior-y:contain}button{font:inherit;color:inherit;cursor:pointer}input,textarea,select{font:inherit;color:inherit}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;color:var(--ink);margin:0 0 .4em}h1{font-size:2.2rem}h2{font-size:1.6rem}h3{font-size:1.25rem}.centered{display:grid;place-items:center;min-height:100svh;padding:1rem}.app{display:grid;grid-template-columns:248px 1fr;min-height:100svh;background:var(--bg)}.sidebar{background:var(--bg-elev);border-right:1px solid var(--border);padding:24px 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var(--border);border-radius:var(--radius-md);overflow:hidden}.chat-stream{flex:1;overflow-y:auto;padding:24px 28px;display:flex;flex-direction:column;gap:14px}.bubble{max-width:78%;padding:10px 14px;border-radius:14px;white-space:pre-wrap;line-height:1.5}.bubble.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.bubble.assistant{align-self:flex-start;background:var(--bg-soft);color:var(--ink);border-bottom-left-radius:4px}.correction{align-self:flex-end;max-width:78%;background:var(--warning-soft);border-left:3px solid var(--warning);color:var(--ink);padding:8px 12px;border-radius:8px;font-size:.85rem}.correction code{background:#0000000f;padding:1px 5px;border-radius:4px}.chat-input{display:flex;gap:8px;border-top:1px solid var(--border);padding:12px 14px;background:var(--bg-elev)}.chat-input input{flex:1}.login-shell{min-height:100svh;display:grid;place-items:center;padding:24px;background:linear-gradient(180deg,var(--bg) 0%,var(--bg-soft) 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0}.app-mobile{display:flex;flex-direction:column;min-height:100svh;background:var(--bg);position:relative}.mob-header{position:sticky;top:0;z-index:10;background:var(--bg);padding:calc(env(safe-area-inset-top,0px) + 12px) 18px 10px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid transparent;transition:border-color .2s ease}.mob-header.bordered{border-bottom-color:var(--border)}.mob-header h1{font-size:1.3rem;margin:0;font-family:var(--font-display);letter-spacing:-.02em}.mob-header .back{width:36px;height:36px;border-radius:50%;background:var(--bg-elev);border:1px solid var(--border);display:grid;place-items:center;color:var(--ink);cursor:pointer;flex-shrink:0}.mob-header .avatar{width:36px;height:36px;border-radius:50%;background:var(--primary-grad);color:#fff;display:grid;place-items:center;font-weight:700;font-family:var(--font-display);flex-shrink:0}.mob-content{flex:1;padding:8px 18px calc(88px + env(safe-area-inset-bottom,0px));overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain}.mob-tabbar{position:fixed;bottom:0;left:0;right:0;z-index:20;background:#ffffffeb;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr);padding:8px 4px calc(8px + env(safe-area-inset-bottom,0px));gap:2px;transition:transform .18s ease}html.kb-open .mob-tabbar{transform:translateY(100%)}.tab-btn{display:flex;flex-direction:column;align-items:center;gap:3px;padding:6px 4px;background:transparent;border:none;color:var(--ink-faint);font-size:.65rem;font-weight:600;letter-spacing:.01em;border-radius:8px;transition:color .15s ease;cursor:pointer}.tab-btn.active{color:var(--primary)}.tab-btn .tab-icon{width:24px;height:24px;display:grid;place-items:center}.greet-card,.mob-section-title{display:none}.app-mobile .greet-card,.app-mobile .mob-section-title{display:block}.app-mobile 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var(--border);gap:12px}.settings-row:last-child{border-bottom:none}.settings-row .label{font-weight:500}.settings-row .value{color:var(--ink-soft);font-size:.9rem}.theory-block{background:var(--bg-elev);border:1px solid var(--border);border-radius:18px;padding:28px 30px;display:flex;flex-direction:column;gap:18px}.mob-content .theory-block{border:none;border-radius:0;padding:12px 0 24px;background:transparent}.theory-head{display:flex;gap:12px;align-items:flex-start;justify-content:space-between}.theory-title{font-family:var(--font-display);font-size:1.6rem;margin:6px 0 0;color:var(--ink)}.mob-content .theory-title{font-size:1.3rem}.theory-summary{font-size:1.02rem;color:var(--ink-soft);margin:0;line-height:1.55}.theory-section{border-top:1px solid var(--border);padding-top:14px}.theory-section h3{font-family:var(--font-display);font-size:1.1rem;margin:0 0 8px;color:var(--ink)}.theory-section p{margin:0 0 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