*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--primary: #6366f1;--primary-light: #818cf8;--primary-dark: #4f46e5;--accent: #06b6d4;--accent-glow: rgba(6, 182, 212, .25);--bg: #09090f;--bg-elevated: #0f0f18;--surface: #161622;--surface-hover: #1e1e2e;--border: rgba(255, 255, 255, .08);--border-light: rgba(255, 255, 255, .12);--text: #f0f0f5;--text-muted: #9494a8;--text-dim: #6b6b80;--user-bg: linear-gradient(135deg, #6366f1, #4f46e5);--assistant-bg: #1a1a28;--success: #22c55e;--error: #ef4444;--shadow: 0 4px 24px rgba(0, 0, 0, .4);--shadow-lg: 0 12px 48px rgba(0, 0, 0, .5);--radius: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition: .2s ease;--header-height: 64px}html{scroll-behavior:smooth}body{font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.container{max-width:1200px;margin:0 auto;padding:0 24px}header{position:fixed;top:0;width:100%;z-index:100;background:#09090fd9;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}nav{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}.logo{font-size:1.35rem;font-weight:700;background:linear-gradient(135deg,var(--primary-light),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;letter-spacing:-.02em}.nav-links{list-style:none;display:flex;gap:32px}.nav-links a{color:var(--text-muted);text-decoration:none;font-size:.925rem;font-weight:500;transition:color var(--transition)}.nav-links a:hover{color:var(--text)}.nav-actions{display:flex;align-items:center;gap:8px}.icon-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:transparent;border:1px solid var(--border);border-radius:10px;color:var(--text-muted);cursor:pointer;transition:all var(--transition)}.icon-btn:hover{background:var(--surface);color:var(--text);border-color:var(--border-light)}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;background:transparent;border:1px solid var(--border);border-radius:10px;cursor:pointer;padding:10px}.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:1px;transition:transform var(--transition),opacity var(--transition)}.nav-toggle[aria-expanded=true] span:nth-child(1){transform:translateY(7px) rotate(45deg)}.nav-toggle[aria-expanded=true] span:nth-child(2){opacity:0}.nav-toggle[aria-expanded=true] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.mobile-menu{display:none;flex-direction:column;padding:16px 24px 24px;border-top:1px solid var(--border);gap:4px}.mobile-menu a,.mobile-menu button{color:var(--text-muted);text-decoration:none;font-size:1rem;padding:12px 0;background:none;border:none;text-align:left;cursor:pointer;font-family:inherit}.mobile-menu a:hover,.mobile-menu button:hover{color:var(--text)}.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding-top:var(--header-height);overflow:hidden}.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 80% 60% at 50% -10%,rgba(99,102,241,.18),transparent),radial-gradient(ellipse 60% 50% at 80% 50%,rgba(6,182,212,.1),transparent),radial-gradient(ellipse 50% 40% at 20% 80%,rgba(99,102,241,.08),transparent);pointer-events:none}.hero-content{position:relative;text-align:center;padding:80px 24px 100px;animation:fadeUp .8s ease-out}@keyframes fadeUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}.hero-badge{display:inline-block;padding:6px 16px;background:#6366f11f;border:1px solid rgba(99,102,241,.25);border-radius:50px;font-size:.8rem;font-weight:600;color:var(--primary-light);letter-spacing:.04em;text-transform:uppercase;margin-bottom:28px}.hero h1{font-size:clamp(2.5rem,6vw,4rem);font-weight:800;line-height:1.1;letter-spacing:-.03em;background:linear-gradient(135deg,#fff 30%,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:24px}.hero p{font-size:clamp(1rem,2.5vw,1.2rem);color:var(--text-muted);max-width:560px;margin:0 auto 40px;line-height:1.7}.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.cta-btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;padding:14px 32px;border-radius:50px;text-decoration:none;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition);font-family:inherit}.cta-btn:hover{transform:translateY(-2px);box-shadow:0 8px 32px #6366f159}.cta-btn.secondary{background:transparent;border:1px solid var(--border-light);color:var(--text)}.cta-btn.secondary:hover{background:var(--surface);box-shadow:none;transform:translateY(-2px)}.features{padding:100px 0;background:var(--bg-elevated)}.features h2,.chat-header h2{font-size:clamp(1.75rem,4vw,2.25rem);font-weight:700;text-align:center;letter-spacing:-.02em}.section-subtitle{text-align:center;color:var(--text-muted);margin-top:12px;margin-bottom:48px;font-size:1.05rem}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px 28px;transition:transform var(--transition),border-color var(--transition),box-shadow var(--transition)}.feature-card:hover{transform:translateY(-4px);border-color:#6366f14d;box-shadow:var(--shadow)}.feature-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;background:#6366f11f;border-radius:14px;color:var(--primary-light);margin-bottom:20px}.feature-card h3{font-size:1.15rem;font-weight:600;margin-bottom:10px}.feature-card p{color:var(--text-muted);font-size:.95rem;line-height:1.65}.chat-section{padding:100px 0 80px}.chat-header{margin-bottom:32px}.chat-app{display:grid;grid-template-columns:260px 1fr;height:min(720px,calc(100vh - 280px));min-height:480px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-lg)}.chat-sidebar{display:flex;flex-direction:column;background:var(--bg-elevated);border-right:1px solid var(--border);padding:16px 12px;overflow:hidden}.new-chat-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:12px 16px;background:#6366f11f;border:1px dashed rgba(99,102,241,.35);border-radius:var(--radius);color:var(--primary-light);font-size:.9rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:inherit;margin-bottom:12px;flex-shrink:0}.new-chat-btn:hover{background:#6366f133;border-color:var(--primary)}.conversation-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:4px}.conversation-item{display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:var(--radius);cursor:pointer;transition:background var(--transition);border:none;background:transparent;color:var(--text-muted);font-size:.875rem;text-align:left;font-family:inherit;width:100%}.conversation-item:hover{background:var(--surface-hover);color:var(--text)}.conversation-item.active{background:#6366f126;color:var(--text)}.conversation-item span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-item 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12px;color:var(--text);font-size:.875rem;font-family:inherit;cursor:pointer;outline:none}.model-select:focus{border-color:var(--primary)}.model-status{margin-left:auto;font-size:.8rem;color:var(--text-dim)}.model-status.connected{color:var(--success)}.model-status.error{color:var(--error)}.messages-container{flex:1;overflow-y:auto;padding:24px;scroll-behavior:smooth}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;height:100%;min-height:280px;animation:fadeUp .5s ease-out}.welcome-icon{display:flex;align-items:center;justify-content:center;width:80px;height:80px;background:#6366f11a;border-radius:20px;color:var(--primary-light);margin-bottom:24px}.welcome-screen h3{font-size:1.5rem;font-weight:600;margin-bottom:8px}.welcome-screen>p{color:var(--text-muted);margin-bottom:28px;max-width:400px}.prompt-suggestions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;max-width:560px}.prompt-chip{padding:10px 16px;background:var(--bg);border:1px solid var(--border);border-radius:50px;color:var(--text-muted);font-size:.85rem;cursor:pointer;transition:all var(--transition);font-family:inherit}.prompt-chip:hover{border-color:var(--primary);color:var(--text);background:#6366f114}.message{display:flex;gap:14px;margin-bottom:24px;animation:fadeUp .3s ease-out}.message-avatar{flex-shrink:0;width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;letter-spacing:.02em}.message.user .message-avatar{background:var(--user-bg);color:#fff}.message.assistant .message-avatar{background:#06b6d426;color:var(--accent)}.message-content{flex:1;min-width:0;padding-top:6px}.message-role{font-size:.8rem;font-weight:600;color:var(--text-dim);margin-bottom:6px;text-transform:uppercase;letter-spacing:.05em}.message-text{font-size:.975rem;line-height:1.7;color:var(--text);white-space:pre-wrap;word-break:break-word}.message-text.streaming:after{content:"";display:inline-block;width:2px;height:1em;background:var(--accent);margin-left:2px;vertical-align:text-bottom;animation:blink 1s step-end infinite}@keyframes blink{50%{opacity:0}}.message.error .message-text{color:var(--error)}.typing-indicator{display:flex;gap:5px;padding:4px 0}.typing-indicator span{width:8px;height:8px;background:var(--text-dim);border-radius:50%;animation:bounce 1.4s ease-in-out infinite}.typing-indicator span:nth-child(2){animation-delay:.16s}.typing-indicator span:nth-child(3){animation-delay:.32s}@keyframes bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.chat-input-area{padding:16px 20px 12px;border-top:1px solid var(--border);flex-shrink:0}.input-wrapper{display:flex;align-items:flex-end;gap:10px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:8px 8px 8px 16px;transition:border-color var(--transition),box-shadow var(--transition)}.input-wrapper:focus-within{border-color:#6366f180;box-shadow:0 0 0 3px #6366f11a}#chat-input{flex:1;background:transparent;border:none;color:var(--text);font-size:.975rem;font-family:inherit;line-height:1.5;resize:none;max-height:160px;outline:none;padding:8px 0}#chat-input::placeholder{color:var(--text-dim)}.send-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));border:none;border-radius:10px;color:#fff;cursor:pointer;transition:all var(--transition);flex-shrink:0}.send-btn:disabled{opacity:.35;cursor:not-allowed}.send-btn:not(:disabled):hover{transform:scale(1.05);box-shadow:0 4px 16px #6366f166}.input-hint{text-align:center;font-size:.75rem;color:var(--text-dim);margin-top:10px}.modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:24px}.modal[hidden]{display:none}.modal-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{position:relative;width:100%;max-width:480px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-lg);animation:fadeUp .3s ease-out}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.modal-header h2{font-size:1.25rem;font-weight:600}.form-group{margin-bottom:20px}.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:8px;color:var(--text-muted)}.form-group input,.form-group select{width:100%;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:12px 16px;color:var(--text);font-size:.95rem;font-family:inherit;outline:none;transition:border-color var(--transition)}.form-group input:focus,.form-group select:focus{border-color:var(--primary)}.api-key-wrapper{display:flex;gap:8px}.api-key-wrapper input{flex:1}.form-hint{font-size:.8rem;color:var(--text-dim);margin-top:8px;line-height:1.5}.form-actions{margin-top:8px}.settings-status{margin-top:16px;font-size:.875rem;text-align:center;min-height:1.25em}.settings-status.success{color:var(--success)}.settings-status.error{color:var(--error)}footer{border-top:1px solid var(--border);padding:32px 0}.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.footer-brand{font-weight:600;color:var(--text-muted)}.footer-copy{font-size:.85rem;color:var(--text-dim)}@media(max-width:900px){.chat-app{grid-template-columns:1fr;height:min(680px,calc(100vh - 240px))}.chat-sidebar{position:absolute;top:0;left:0;bottom:0;width:260px;z-index:10;transform:translate(-100%);transition:transform .3s ease;box-shadow:var(--shadow-lg)}.chat-sidebar.open{transform:translate(0)}.chat-app{position:relative}.sidebar-toggle{display:flex}}@media(max-width:640px){.nav-links{display:none}.nav-toggle{display:flex}.mobile-menu:not([hidden]){display:flex}.hero-content{padding:60px 24px 80px}.features,.chat-section{padding:72px 0}.chat-app{border-radius:var(--radius-lg);min-height:420px}.messages-container{padding:16px}.prompt-suggestions{flex-direction:column;align-items:stretch}.footer-inner{flex-direction:column;text-align:center}}