*,*: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: #070714;--bg-elevated: #0f0f1f;--surface: #16162a;--surface-hover: #1e1e38;--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .14);--text: #f0f0f8;--text-muted: #9494b0;--user-bg: linear-gradient(135deg, var(--primary), var(--primary-dark));--assistant-bg: rgba(255, 255, 255, .05);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 8px 32px rgba(0, 0, 0, .35);--shadow-lg: 0 16px 48px rgba(99, 102, 241, .15);--radius-sm: .625rem;--radius-md: 1rem;--radius-lg: 1.25rem;--header-h: 4rem;--transition: .2s ease}html{scroll-behavior:smooth;overflow-x:hidden}body{font-family:Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;min-height:100vh}#app{display:flex;flex-direction:column;min-height:100vh}main{flex:1 0 auto}.container{width:100%;max-width:72rem;margin:0 auto;padding:0 clamp(1rem,4vw,2rem)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.hidden{display:none!important}header{position:fixed;top:0;left:0;right:0;z-index:100;background:#070714e0;-webkit-backdrop-filter:blur(1rem);backdrop-filter:blur(1rem);border-bottom:1px solid var(--border)}.nav{position:relative;display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:1rem}.logo{font-size:clamp(1.1rem,3vw,1.35rem);font-weight:700;text-decoration:none;background:linear-gradient(135deg,var(--primary-light),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-links{list-style:none;display:flex;gap:clamp(1rem,3vw,2rem)}.nav-links a{color:var(--text-muted);text-decoration:none;font-size:.95rem;font-weight:500;transition:color var(--transition);min-height:2.75rem;display:inline-flex;align-items:center}.nav-links a:hover{color:var(--text)}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:.35rem;width:2.75rem;height:2.75rem;padding:.5rem;background:transparent;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer}.nav-toggle-bar{display:block;width:100%;height:2px;background:var(--text);border-radius:1px;transition:transform var(--transition),opacity var(--transition)}@media(max-width:767px){.nav-toggle{display:flex}.nav-links{position:fixed;top:var(--header-h);left:0;right:0;flex-direction:column;background:#070714f7;border-bottom:1px solid var(--border);padding:1rem clamp(1rem,4vw,2rem);gap:0;transform:translateY(-110%);opacity:0;pointer-events:none;transition:transform var(--transition),opacity var(--transition)}.nav-links.open{transform:translateY(0);opacity:1;pointer-events:auto}.nav-links li{border-bottom:1px solid var(--border)}.nav-links li:last-child{border-bottom:none}.nav-links a{display:flex;width:100%;padding:.875rem 0}}.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:calc(var(--header-h) + 3rem) 0 4rem;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,.25),transparent),radial-gradient(ellipse 50% 40% at 80% 60%,rgba(6,182,212,.12),transparent),radial-gradient(ellipse 40% 30% at 10% 80%,rgba(99,102,241,.1),transparent);pointer-events:none}.hero-content{position:relative;width:100%;text-align:center;max-width:42rem}.hero-label{display:inline-block;font-size:clamp(.8rem,2vw,.9rem);font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem;padding:.35rem .875rem;border:1px solid rgba(6,182,212,.3);border-radius:2rem;background:#06b6d414}.hero h1{font-size:clamp(2rem,6vw,3.5rem);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:1.25rem;background:linear-gradient(135deg,#fff 30%,var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:clamp(1rem,2.5vw,1.2rem);color:var(--text-muted);max-width:36rem;margin:0 auto 2rem;line-height:1.7}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:2.75rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;border-radius:var(--radius-md);border:none;cursor:pointer;text-decoration:none;transition:transform var(--transition),box-shadow var(--transition),background var(--transition)}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:var(--shadow-lg)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 40px #6366f159}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-strong)}.btn-secondary:hover{background:var(--surface-hover)}.chat-section{padding:clamp(3rem,8vw,6rem) 0;background:var(--bg-elevated);border-top:1px solid var(--border);scroll-margin-top:calc(var(--header-h) + 1rem)}.chat-header{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1.5rem}.chat-header h2{font-size:clamp(1.5rem,4vw,2rem);font-weight:700;margin-bottom:.25rem}.chat-subtitle{color:var(--text-muted);font-size:.95rem}.chat-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden;display:flex;flex-direction:column;height:clamp(20rem,65vh,42rem);min-height:20rem;max-height:min(42rem,85vh)}.chat-messages{flex:1 1 auto;min-height:0;overflow-y:auto;padding:clamp(1rem,3vw,1.5rem);display:flex;flex-direction:column;gap:1rem;scroll-behavior:smooth}.welcome-message{display:flex;flex-direction:column;align-items:center;text-align:center;padding:clamp(1.5rem,5vw,3rem) clamp(1rem,3vw,2rem);margin:auto 0}.welcome-icon{width:4rem;height:4rem;display:flex;align-items:center;justify-content:center;background:#6366f126;border-radius:50%;color:var(--primary-light);margin-bottom:1.25rem}.welcome-message h3{font-size:clamp(1.15rem,3vw,1.4rem);font-weight:600;margin-bottom:.5rem}.welcome-message p{color:var(--text-muted);font-size:.95rem;max-width:24rem;margin-bottom:1.5rem}.suggestion-chips{display:flex;flex-wrap:wrap;gap:.625rem;justify-content:center;max-width:100%}.chip{background:var(--bg-elevated);border:1px solid var(--border-strong);color:var(--text-muted);padding:.5rem 1rem;border-radius:2rem;font-size:.875rem;cursor:pointer;transition:background var(--transition),color var(--transition),border-color var(--transition);min-height:2.75rem}.chip:hover{background:var(--surface-hover);color:var(--text);border-color:var(--primary)}.message{display:flex;max-width:85%;animation:fadeIn .25s ease}.message-user{align-self:flex-end}.message-assistant{align-self:flex-start}.message-bubble{padding:.875rem 1.125rem;border-radius:var(--radius-md);font-size:.95rem;line-height:1.65;word-wrap:break-word;overflow-wrap:break-word}.message-user .message-bubble{background:var(--user-bg);color:#fff;border-bottom-right-radius:.25rem}.message-assistant .message-bubble{background:var(--assistant-bg);border:1px solid var(--border);border-bottom-left-radius:.25rem}.message-bubble code{background:#00000040;padding:.15rem .4rem;border-radius:.25rem;font-size:.875em;font-family:Consolas,Monaco,monospace}@keyframes fadeIn{0%{opacity:0;transform:translateY(.5rem)}to{opacity:1;transform:translateY(0)}}.typing-indicator{display:flex;align-items:center;gap:.35rem;padding:0 1.5rem .75rem}.typing-dot{width:.5rem;height:.5rem;background:var(--text-muted);border-radius:50%;animation:bounce 1.2s infinite ease-in-out}.typing-dot:nth-child(2){animation-delay:.15s}.typing-dot:nth-child(3){animation-delay:.3s}@keyframes bounce{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-.35rem);opacity:1}}.chat-error{margin:0 1rem;padding:.75rem 1rem;background:#ef44441f;border:1px solid rgba(239,68,68,.3);border-radius:var(--radius-sm);color:#fca5a5;font-size:.9rem}.chat-form{display:flex;align-items:flex-end;gap:.75rem;padding:clamp(.75rem,2vw,1rem) clamp(.75rem,2vw,1.25rem);border-top:1px solid var(--border);background:#00000026}.chat-form textarea{flex:1;min-height:2.75rem;max-height:10rem;padding:.75rem 1rem;background:var(--bg-elevated);border:1px solid var(--border-strong);border-radius:var(--radius-md);color:var(--text);font-family:inherit;font-size:1rem;line-height:1.5;resize:none;outline:none;transition:border-color var(--transition);width:100%}.chat-form textarea:focus{border-color:var(--primary)}.chat-form textarea:disabled{opacity:.6;cursor:not-allowed}.send-btn{flex-shrink:0;width:2.75rem;height:2.75rem;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-dark));border:none;border-radius:var(--radius-md);color:#fff;cursor:pointer;transition:transform var(--transition),opacity var(--transition)}.send-btn:hover:not(:disabled){transform:scale(1.05)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.footer{padding:2rem 0;border-top:1px solid var(--border)}.footer-inner{text-align:center}.footer p{color:var(--text-muted);font-size:.875rem}@media(min-width:768px){.chat-panel{height:clamp(28rem,65vh,42rem);min-height:28rem}.message{max-width:75%}}@media(min-width:1024px){.hero-content{max-width:48rem}.message{max-width:70%}}@media(max-width:480px){.chat-header{flex-direction:column}.chat-header .btn{width:100%}.message{max-width:92%}.suggestion-chips{flex-direction:column;align-items:stretch}.chip{text-align:center}}