*{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#f5f5f5;--bg-secondary:#fff;--bg-tertiary:#f0f0f0;--text-primary:#111;--text-secondary:#555;--border-color:#ddd;--accent:#111;--accent-hover:#000;--accent-text:#fff;--bubble-ai-bg:#fff;--bubble-user-bg:#111;--bubble-user-text:#fff;--error-bg:#fdeaea;--error-text:#c0392b}[data-theme=dark]{--bg-primary:#121212;--bg-secondary:#1e1e1e;--bg-tertiary:#2a2a2a;--text-primary:#f5f5f5;--text-secondary:#aaa;--border-color:#333;--accent:#f5f5f5;--accent-hover:#fff;--accent-text:#111;--bubble-ai-bg:#2a2a2a;--bubble-user-bg:#f5f5f5;--bubble-user-text:#111;--error-bg:#3a1f1f;--error-text:#f28b82}body{background:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;transition:background .2s,color .2s}.landing{background:var(--bg-primary);min-height:100vh;color:var(--text-primary)}.landing-nav{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:20px 40px;display:flex}.landing-logo{letter-spacing:-.5px;font-size:22px;font-weight:700}.landing-nav-links{align-items:center;gap:20px;display:flex}.landing-theme-toggle{background:var(--bg-tertiary);border:1px solid var(--border-color);cursor:pointer;border-radius:8px;padding:6px 10px;font-size:15px;transition:opacity .2s}.landing-theme-toggle:hover{opacity:.7}.landing-nav-links a{color:var(--text-secondary);font-size:14px;font-weight:500;text-decoration:none}.landing-nav-links a:hover{color:var(--text-primary)}.nav-cta{background:var(--accent);border-radius:8px;padding:8px 16px;color:var(--accent-text)!important}.landing-hero{grid-template-columns:1fr 1fr;align-items:center;gap:50px;max-width:1150px;margin:0 auto;padding:70px 40px;display:grid}.hero-badge{text-transform:uppercase;letter-spacing:1px;color:var(--text-secondary);border:1px solid var(--border-color);border-radius:20px;margin-bottom:20px;padding:5px 12px;font-size:12px;font-weight:600;display:inline-block}.hero-text h1{letter-spacing:-1px;margin-bottom:18px;font-size:44px;line-height:1.15}.hero-text p{color:var(--text-secondary);max-width:460px;margin-bottom:30px;font-size:16px;line-height:1.65}.hero-actions{flex-wrap:wrap;gap:12px;display:flex}.btn-primary,.btn-secondary{border-radius:8px;padding:13px 26px;font-size:15px;font-weight:600;text-decoration:none;display:inline-block}.btn-primary{background:var(--accent);color:var(--accent-text)}.btn-secondary{color:var(--text-primary);border:1px solid var(--border-color);background:0 0}.btn-primary,.btn-secondary{transition:opacity .2s,transform .1s}.btn-primary:hover,.btn-secondary:hover{opacity:.85}.btn-primary:active,.btn-secondary:active{transform:scale(.97)}.preview-window{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;overflow:hidden;box-shadow:0 20px 50px #0000001f}.preview-bar{background:var(--bg-tertiary);border-bottom:1px solid var(--border-color);gap:7px;padding:12px 14px;display:flex}.dot{border-radius:50%;width:11px;height:11px}.dot.red{background:#ff5f57}.dot.yellow{background:#febc2e}.dot.green{background:#28c840}.preview-body{flex-direction:column;gap:14px;padding:20px;display:flex}.preview-msg{border-radius:12px;max-width:85%;padding:12px 15px;font-size:13.5px;line-height:1.55}.preview-msg.user{background:var(--bubble-user-bg);color:var(--bubble-user-text);border-bottom-right-radius:4px;align-self:flex-end}.preview-msg.ai{background:var(--bg-tertiary);border:1px solid var(--border-color);border-bottom-left-radius:4px;align-self:flex-start}.preview-msg.ai p{margin-bottom:8px}.preview-msg.ai p:last-child{margin-bottom:0}.preview-msg.ai pre{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;margin:8px 0;padding:10px 12px;font-size:12.5px;overflow-x:auto}.preview-msg.ai code{font-family:monospace}.landing-features{grid-template-columns:repeat(3,1fr);gap:22px;max-width:1150px;margin:0 auto;padding:50px 40px 70px;display:grid}.feature{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;padding:28px}.feature h3{margin-bottom:10px;font-size:18px}.feature p{color:var(--text-secondary);font-size:14px;line-height:1.6}.landing-cta{text-align:center;border-top:1px solid var(--border-color);padding:70px 40px}.landing-cta h2{letter-spacing:-.5px;margin-bottom:10px;font-size:30px}.landing-cta p{color:var(--text-secondary);margin-bottom:26px;font-size:15px}.landing-footer{border-top:1px solid var(--border-color);color:var(--text-secondary);justify-content:space-between;align-items:center;padding:24px 40px;font-size:13px;display:flex}.landing-footer a{color:var(--text-secondary);text-decoration:none}.landing-footer a:hover{color:var(--text-primary);text-decoration:underline}@media (width<=860px){.landing-hero{grid-template-columns:1fr;gap:40px;padding:45px 24px}.hero-text h1{font-size:33px}.landing-features{grid-template-columns:1fr;padding:30px 24px 50px}.landing-nav,.landing-footer{padding:18px 24px}.landing-footer{flex-direction:column;gap:10px}}.reveal{opacity:0;transition:opacity .6s ease-out,transform .6s ease-out;transform:translateY(24px)}.reveal-visible{opacity:1;transform:translateY(0)}.auth-page{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.auth-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;width:100%;max-width:480px;padding:56px;animation:.45s ease-out authCardIn;box-shadow:0 10px 40px #00000014}.auth-terms-note{text-align:center;color:var(--text-secondary);margin-top:16px;font-size:12px}.terms-confirmed{color:var(--accent);font-weight:600}.auth-terms-note a{color:var(--text-secondary);text-decoration:underline}@keyframes authCardIn{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.auth-card h1{color:var(--text-primary);margin-bottom:4px;font-size:28px;font-weight:700}.auth-subtitle{color:var(--text-secondary);margin-bottom:24px;font-size:14px}.auth-card label{color:var(--text-primary);margin-top:16px;margin-bottom:6px;font-size:13px;font-weight:600;display:block}.auth-card input{border:1px solid var(--border-color);background:var(--bg-primary);width:100%;color:var(--text-primary);border-radius:8px;outline:none;padding:14px 16px;font-size:14px;transition:border-color .2s,box-shadow .2s}.auth-card input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #4f46e526}.auth-card button{background:var(--accent);width:100%;color:var(--accent-text);cursor:pointer;border:none;border-radius:8px;margin-top:28px;padding:14px;font-size:16px;font-weight:600;transition:opacity .2s,transform .1s}.auth-card button:hover:not(:disabled){opacity:.85;transform:scale(.98)}.auth-card button:disabled{opacity:.5;cursor:not-allowed}.auth-error{background:var(--error-bg);color:var(--error-text);border-radius:8px;margin-bottom:8px;padding:10px 12px;font-size:13px}.auth-switch{text-align:center;color:var(--text-secondary);margin-top:20px;font-size:13px}.auth-switch a{color:var(--text-primary);font-weight:600;text-decoration:underline}.terms-page{background:var(--bg-primary);min-height:100vh;padding:60px 24px}.terms-container{max-width:720px;margin:0 auto}.terms-back{color:var(--text-secondary);margin-bottom:30px;font-size:14px;text-decoration:none;display:inline-block}.terms-back:hover{color:var(--text-primary)}.terms-container h1{color:var(--text-primary);letter-spacing:-.5px;margin-bottom:6px;font-size:32px}.terms-updated{color:var(--text-secondary);margin-bottom:40px;font-size:13px}.terms-container section{margin-bottom:28px}.terms-container h2{color:var(--text-primary);margin-bottom:8px;font-size:17px}.terms-container p{color:var(--text-secondary);font-size:14.5px;line-height:1.7}.terms-container a{color:var(--accent);text-decoration:underline}.terms-agree-box{border-top:1px solid var(--border-color);margin-top:40px;padding-top:30px}.terms-checkbox{color:var(--text-primary);cursor:pointer;align-items:center;gap:10px;margin-bottom:20px;font-size:14px;display:flex}.terms-checkbox input{cursor:pointer;width:17px;height:17px;accent-color:var(--accent)}.terms-actions{gap:12px;display:flex}.terms-decline,.terms-agree{cursor:pointer;border-radius:8px;padding:12px 24px;font-size:14px;font-weight:600;transition:opacity .2s,transform .1s}.terms-decline{border:1px solid var(--border-color);color:var(--text-primary);background:0 0}.terms-agree{background:var(--accent);color:var(--accent-text);border:none}.terms-agree:disabled{opacity:.4;cursor:not-allowed}.terms-decline:hover,.terms-agree:hover:not(:disabled){opacity:.85}.terms-decline:active,.terms-agree:active:not(:disabled){transform:scale(.98)}.chat-page{background:var(--bg-primary);height:100vh;display:flex}.chat-main{flex-direction:column;flex:1;min-width:0;display:flex}.sidebar-toggle{cursor:pointer;color:var(--text-primary);background:0 0;border:none;padding:4px 8px;font-size:20px;display:block}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;width:260px;padding:16px;transition:margin-left .25s,transform .25s;display:flex}.sidebar-closed{margin-left:-260px}.sidebar-top{flex-direction:column;gap:8px;margin-bottom:16px;display:flex}.sidebar-new-chat{background:var(--accent);color:var(--accent-text);cursor:pointer;border:none;border-radius:8px;flex:1;padding:10px 14px;font-size:14px;font-weight:600;transition:opacity .2s}.sidebar-new-chat:hover{opacity:.85}.sidebar-close{background:var(--bg-tertiary);border:1px solid var(--border-color);cursor:pointer;width:36px;height:36px;color:var(--text-primary);border-radius:8px;flex-shrink:0;font-size:14px}.sidebar-close:hover{opacity:.75}.sidebar-list{flex-direction:column;flex:1;gap:4px;display:flex;overflow-y:auto}.sidebar-empty{color:var(--text-secondary);text-align:center;margin-top:20px;font-size:13px}.sidebar-item{border-radius:8px;align-items:center;transition:background .15s;display:flex}.sidebar-item:hover,.sidebar-item-active{background:var(--bg-tertiary)}.sidebar-item-title{text-align:left;color:var(--text-primary);cursor:pointer;white-space:nowrap;text-overflow:ellipsis;background:0 0;border:none;flex:1;padding:10px;font-size:13.5px;overflow:hidden}.sidebar-item-delete{color:var(--text-secondary);cursor:pointer;opacity:0;background:0 0;border:none;padding:6px 10px;font-size:13px;transition:opacity .15s}.sidebar-item:hover .sidebar-item-delete{opacity:1}.sidebar-item-delete:hover{color:#dc2626}.sidebar-backdrop{display:none}@media (width<=768px){.sidebar-toggle{display:block}.sidebar{z-index:101;height:100vh;margin-left:0;transition:transform .25s;position:fixed;top:0;left:0;transform:translate(-100%);box-shadow:4px 0 20px #00000026}.sidebar-open{transform:translate(0)}.sidebar-closed{transform:translate(-100%)}.sidebar-backdrop{z-index:100;background:#0006;display:block;position:fixed;inset:0}}.chat-header{background:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;padding:16px 24px;display:flex}.chat-header h2{color:var(--text-primary);font-size:18px}.chat-header-right{color:var(--text-secondary);flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;display:flex}.chat-header-right span{display:none}@media (width>=480px){.chat-header-right span{display:inline}}.chat-header-right button{background:var(--bg-tertiary);border:1px solid var(--border-color);cursor:pointer;color:var(--text-primary);border-radius:8px;padding:8px 14px;font-size:13px;font-weight:600;transition:opacity .2s}.chat-header-right button:hover{opacity:.7}.theme-toggle-btn{padding:8px 10px!important;font-size:16px!important}.conversation-select{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;border-radius:8px;max-width:160px;padding:8px 12px;font-size:13px;font-weight:600}.chat-messages{flex-direction:column;flex:1;gap:12px;padding:24px;display:flex;overflow-y:auto}.chat-empty{text-align:center;color:var(--text-secondary);margin-top:40px;font-size:14px}.message-row{width:100%;display:flex}.user-row{justify-content:flex-end}.ai-row{justify-content:flex-start}.message-bubble{white-space:pre-wrap;border-radius:16px;max-width:65%;padding:12px 16px;font-size:14px;line-height:1.5}.user-bubble{background:var(--bubble-user-bg);color:var(--bubble-user-text);border-bottom-right-radius:4px}.ai-bubble{background:var(--bubble-ai-bg);color:var(--text-primary);border:1px solid var(--border-color);border-bottom-left-radius:4px}.ai-bubble p{margin-bottom:8px}.ai-bubble p:last-child{margin-bottom:0}.ai-bubble ul,.ai-bubble ol{margin:8px 0;padding-left:20px}.ai-bubble li{margin-bottom:4px}.ai-bubble code{background:var(--bg-tertiary);border-radius:4px;padding:2px 6px;font-size:13px}.ai-bubble pre{background:var(--bg-tertiary);border-radius:8px;margin:8px 0;padding:10px;overflow-x:auto}.ai-bubble pre code{background:0 0;padding:0}.code-block-wrapper{border:1px solid var(--border-color);border-radius:8px;margin:10px 0;overflow:hidden}.code-block-header{background:var(--bg-tertiary);color:var(--text-secondary);text-transform:uppercase;justify-content:space-between;align-items:center;padding:6px 12px;font-family:monospace;font-size:11px;display:flex}.copy-btn{background:var(--bg-secondary);border:1px solid var(--border-color);cursor:pointer;color:var(--text-primary);border-radius:5px;align-items:center;padding:5px 7px;transition:opacity .2s;display:flex}.copy-btn:hover{opacity:.7}.chat-input-bar{background:var(--bg-secondary);border-top:1px solid var(--border-color);gap:10px;padding:16px 24px;display:flex}.chat-input-bar input{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:24px;outline:none;flex:1;padding:12px 16px;font-size:14px}.chat-input-bar input:focus{border-color:var(--accent)}.chat-input-bar button{background:var(--accent);color:var(--accent-text);cursor:pointer;border:none;border-radius:24px;padding:12px 22px;font-size:14px;font-weight:600;transition:opacity .2s}.chat-input-bar button:hover:not(:disabled){opacity:.85}.chat-input-bar button:disabled{opacity:.5;cursor:not-allowed}