*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--brand-bg: #faf9f7;--brand-text: #1c1917;--brand-primary: #2c4a3e;--brand-accent: #e8b86d;--brand-muted: #8b9e97;--brand-surface: #ffffff;--brand-border: #e4e0da;--brand-error: #c0392b;--brand-success: #27ae60;--brand-radius: 10px}.btn-primary{display:inline-block;padding:12px 28px;background:var(--brand-primary);color:#fff;border:none;border-radius:var(--brand-radius);font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none;transition:background .15s,transform .1s}.btn-primary:hover:not(:disabled){background:#1e3329;transform:translateY(-1px)}.btn-primary:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-primary-sm{display:inline-block;padding:7px 16px;background:var(--brand-primary);color:#fff;border-radius:8px;font-family:inherit;font-size:14px;font-weight:600;text-decoration:none;transition:background .15s}.btn-primary-sm:hover{background:#1e3329}.btn-ghost-sm{display:inline-block;padding:7px 14px;background:transparent;color:var(--brand-muted);border:1px solid var(--brand-border);border-radius:8px;font-family:inherit;font-size:14px;font-weight:500;cursor:pointer;text-decoration:none;transition:color .15s,border-color .15s}.btn-ghost-sm:hover{color:var(--brand-text);border-color:var(--brand-muted)}.btn-danger{display:inline-block;padding:10px 22px;background:#c0392b;color:#fff;border:none;border-radius:var(--brand-radius);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s}.btn-danger:hover:not(:disabled){background:#a93226}.btn-danger:disabled{opacity:.55;cursor:not-allowed}.landing{font-family:DM Sans,Inter,system-ui,sans-serif;background:var(--brand-bg);color:var(--brand-text);min-height:100vh;display:flex;flex-direction:column}.landing-header{display:flex;align-items:center;justify-content:space-between;padding:0 48px;height:64px;background:var(--brand-bg);border-bottom:1px solid var(--brand-border);position:sticky;top:0;z-index:10}.landing-logo{font-size:18px;font-weight:700;color:var(--brand-primary);letter-spacing:-.3px}.landing-nav{display:flex;align-items:center;gap:16px}.landing-nav a:first-child{color:var(--brand-muted);text-decoration:none;font-size:15px;font-weight:500;transition:color .15s}.landing-nav a:first-child:hover{color:var(--brand-text)}.hero{flex:1;display:flex;align-items:center;justify-content:center;padding:100px 48px 80px;text-align:center}.hero-heading{font-size:clamp(40px,6vw,68px);font-weight:700;line-height:1.1;letter-spacing:-1.5px;color:var(--brand-primary);margin-bottom:24px}.hero-sub{font-size:18px;line-height:1.7;color:#57534e;margin-bottom:40px;max-width:520px;margin-left:auto;margin-right:auto}.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:2px;background:var(--brand-border);border-top:1px solid var(--brand-border);border-bottom:1px solid var(--brand-border)}.pillar{background:var(--brand-bg);padding:48px 36px;display:flex;flex-direction:column;gap:14px}.pillar-icon{color:var(--brand-primary);opacity:.8}.pillar h3{font-size:18px;font-weight:700;color:var(--brand-primary)}.pillar p{font-size:15px;line-height:1.65;color:#57534e}.differentiator{padding:80px 48px;display:flex;justify-content:center}.differentiator-inner{max-width:580px;text-align:center}.differentiator h2{font-size:30px;font-weight:700;color:var(--brand-primary);margin-bottom:20px;letter-spacing:-.5px}.differentiator p{font-size:17px;line-height:1.75;color:#57534e;margin-bottom:28px}.protocol-link{color:var(--brand-primary);font-weight:600;font-size:15px;text-decoration:none;border-bottom:2px solid var(--brand-accent);padding-bottom:2px;transition:color .15s}.protocol-link:hover{color:var(--brand-accent)}.cta-strip{background:var(--brand-primary);color:#fff;padding:64px 48px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:28px}.cta-strip h2{font-size:26px;font-weight:700;letter-spacing:-.4px}.cta-strip .btn-primary{background:var(--brand-accent);color:var(--brand-primary)}.cta-strip .btn-primary:hover:not(:disabled){background:#d4a55a;transform:translateY(-1px)}.landing-footer{display:flex;align-items:center;justify-content:space-between;padding:24px 48px;border-top:1px solid var(--brand-border);font-size:14px;color:var(--brand-muted)}.footer-links{display:flex;gap:24px}.footer-links a{color:var(--brand-muted);text-decoration:none;transition:color .15s}.footer-links a:hover{color:var(--brand-text)}.auth-page{min-height:100vh;background:var(--brand-bg);display:flex;align-items:center;justify-content:center;padding:40px 20px;font-family:DM Sans,Inter,system-ui,sans-serif}.auth-card{background:var(--brand-surface);border:1px solid var(--brand-border);border-radius:16px;padding:40px 40px 36px;width:100%;max-width:400px;box-shadow:0 4px 24px #0000000f}.auth-logo{display:block;font-size:16px;font-weight:700;color:var(--brand-primary);text-decoration:none;margin-bottom:28px}.auth-heading{font-size:24px;font-weight:700;color:var(--brand-text);margin-bottom:28px;letter-spacing:-.4px}.auth-form{display:flex;flex-direction:column;gap:18px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:600;color:#44403c}.field input{padding:10px 14px;border:1px solid var(--brand-border);border-radius:8px;font-family:inherit;font-size:15px;color:var(--brand-text);background:var(--brand-surface);outline:none;transition:border-color .15s,box-shadow .15s}.field input:focus{border-color:var(--brand-primary);box-shadow:0 0 0 3px #2c4a3e1a}.field input.input-readonly{background:var(--brand-bg);color:var(--brand-muted);cursor:default}.auth-error{font-size:14px;color:var(--brand-error);padding:10px 14px;background:#fdf2f2;border-radius:8px;border:1px solid #f5c6c6}.auth-success{font-size:14px;color:var(--brand-success);padding:10px 14px;background:#f0faf4;border-radius:8px;border:1px solid #b7e4c7}.auth-submit{width:100%;text-align:center;padding:12px}.auth-switch{margin-top:24px;text-align:center;font-size:14px;color:var(--brand-muted)}.auth-switch a{color:var(--brand-primary);font-weight:600;text-decoration:none}.auth-switch a:hover{text-decoration:underline}.account-page{min-height:100vh;background:var(--brand-bg);font-family:DM Sans,Inter,system-ui,sans-serif}.account-header{display:flex;align-items:center;justify-content:space-between;padding:0 48px;height:64px;background:var(--brand-surface);border-bottom:1px solid var(--brand-border)}.account-header-right{display:flex;align-items:center;gap:10px}.account-main{max-width:600px;margin:0 auto;padding:48px 24px 80px}.account-title{font-size:28px;font-weight:700;color:var(--brand-primary);letter-spacing:-.5px;margin-bottom:40px}.account-section{background:var(--brand-surface);border:1px solid var(--brand-border);border-radius:14px;padding:28px 28px 32px;margin-bottom:24px}.account-section h2{font-size:16px;font-weight:700;color:var(--brand-text);margin-bottom:20px}.account-danger-note{font-size:14px;color:#78716c;margin-bottom:16px;line-height:1.6}.delete-actions{display:flex;gap:10px;align-items:center;margin-top:4px}@media (max-width: 640px){.landing-header{padding:0 20px}.hero{padding:60px 20px 50px}.differentiator{padding:60px 20px}.cta-strip{padding:48px 20px}.landing-footer{padding:20px;flex-direction:column;gap:12px;text-align:center}.auth-card{padding:28px 20px 24px}.account-header{padding:0 20px}.account-main{padding:32px 16px 60px}}:root{--bg: #f7f7f8;--surface: #ffffff;--border: #e5e7eb;--header-bg: #ffffff;--user-bubble: #2563eb;--user-text: #ffffff;--assistant-bubble: #ffffff;--assistant-text: #111827;--muted: #6b7280;--placeholder: #9ca3af;--input-bg: #ffffff;--send-bg: #2563eb;--send-hover: #1d4ed8;--send-disabled: #93c5fd;--feedback-hover: #f3f4f6;--shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.04);--radius: 18px;--radius-sm: 8px}html,body,#root{height:100%;font-family:Inter,system-ui,-apple-system,sans-serif;font-size:15px;color:var(--assistant-text);background:var(--bg);-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;height:100%;max-width:860px;margin:0 auto}.header{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:60px;background:var(--header-bg);border-bottom:1px solid var(--border);flex-shrink:0;gap:12px}.header-left{display:flex;align-items:center;gap:12px}.header h1{font-size:18px;font-weight:600;letter-spacing:-.3px;color:#111827}.header-right{display:flex;align-items:center;gap:8px}.btn-ghost{padding:6px 12px;border-radius:var(--radius-sm);border:1px solid var(--border);background:transparent;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;transition:background .15s,color .15s,border-color .15s;font-family:inherit;white-space:nowrap}.btn-ghost:hover{background:var(--bg);color:#374151;border-color:#d1d5db}.tone-select{padding:6px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);font-size:13px;font-weight:500;color:#374151;cursor:pointer;font-family:inherit;outline:none;transition:border-color .15s}.tone-select:focus{border-color:#93c5fd;box-shadow:0 0 0 3px #3b82f61f}.messages{flex:1;overflow-y:auto;padding:24px 20px;display:flex;flex-direction:column;gap:6px;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-track{background:transparent}.messages::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--muted);text-align:center;padding:40px}.empty-state .empty-icon{font-size:40px;opacity:.4}.empty-state p{font-size:15px;max-width:280px;line-height:1.5}.message-row{display:flex;align-items:flex-end;gap:8px;max-width:78%;animation:fadeSlideIn .18s ease-out}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message-row.user{align-self:flex-end;flex-direction:row-reverse}.message-row.assistant{align-self:flex-start}.avatar{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;letter-spacing:-.5px}.avatar.user-avatar{background:#dbeafe;color:#1d4ed8}.avatar.assistant-avatar{background:#f3f4f6;color:#374151}.bubble{padding:11px 15px;border-radius:var(--radius);line-height:1.6;white-space:pre-wrap;word-break:break-word;font-size:15px}.bubble.user-bubble{background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:4px;box-shadow:var(--shadow-sm)}.bubble.assistant-bubble{background:var(--assistant-bubble);color:var(--assistant-text);border-bottom-left-radius:4px;box-shadow:var(--shadow-sm);border:1px solid var(--border)}.feedback{display:flex;gap:4px;margin-top:4px;margin-left:38px;opacity:0;transition:opacity .15s}.message-row.assistant:hover .feedback{opacity:1}.feedback-btn{padding:3px 8px;border-radius:6px;border:1px solid var(--border);background:var(--surface);font-size:11px;color:var(--muted);cursor:pointer;font-family:inherit;transition:background .12s,color .12s;white-space:nowrap}.feedback-btn:hover{background:var(--feedback-hover);color:#374151}.feedback-btn.sent{color:#16a34a;border-color:#86efac;background:#f0fdf4}.loading-row{display:flex;align-items:center;gap:8px;align-self:flex-start;margin-top:4px}.loading-dots{display:flex;gap:5px;padding:14px 16px;background:var(--assistant-bubble);border:1px solid var(--border);border-radius:var(--radius);border-bottom-left-radius:4px;box-shadow:var(--shadow-sm)}.loading-dots span{width:7px;height:7px;border-radius:50%;background:#9ca3af;animation:bounce 1.2s ease-in-out infinite}.loading-dots span:nth-child(1){animation-delay:0s}.loading-dots span:nth-child(2){animation-delay:.18s}.loading-dots span:nth-child(3){animation-delay:.36s}@keyframes bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}.input-area{padding:14px 20px 18px;background:var(--header-bg);border-top:1px solid var(--border);flex-shrink:0}.input-box{display:flex;align-items:flex-end;gap:8px;background:var(--input-bg);border:1px solid #d1d5db;border-radius:14px;padding:10px 10px 10px 16px;transition:border-color .15s,box-shadow .15s}.input-box:focus-within{border-color:#93c5fd;box-shadow:0 0 0 3px #3b82f61f}.input-textarea{flex:1;border:none;outline:none;background:transparent;font-family:inherit;font-size:15px;color:#111827;resize:none;line-height:1.5;max-height:180px;overflow-y:auto;padding:2px 0}.input-textarea::placeholder{color:var(--placeholder)}.input-textarea::-webkit-scrollbar{width:4px}.input-textarea::-webkit-scrollbar-thumb{background:#e5e7eb;border-radius:2px}.send-btn{flex-shrink:0;width:36px;height:36px;border-radius:10px;border:none;background:var(--send-bg);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,transform .1s;align-self:flex-end}.send-btn:hover:not(:disabled){background:var(--send-hover);transform:scale(1.04)}.send-btn:disabled{background:var(--send-disabled);cursor:not-allowed;transform:none}.send-btn svg{width:16px;height:16px}.input-hint{margin-top:6px;font-size:12px;color:var(--placeholder);text-align:center}