:root{--bg: #0f1216;--surface: #171b22;--surface-2: #1e242d;--border: #2a313c;--text: #e8ecf1;--text-muted: #9aa4b2;--primary: #ffd400;--primary-ink: #1a1a1a;--accent-blue: #2b6cff;--danger: #ff6b6b;--radius: 12px;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);line-height:1.5}a{color:inherit;text-decoration:none}.app-shell{min-height:100%;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-bottom:1px solid var(--border);background:var(--surface)}.brand{font-weight:700;font-size:1.25rem;letter-spacing:.5px}.brand-mark{color:var(--primary)}.app-nav{display:flex;align-items:center;gap:1rem}.app-nav a:hover{color:var(--primary)}.nav-cta{background:var(--primary);color:var(--primary-ink)!important;padding:.4rem .9rem;border-radius:8px;font-weight:600}.link-button{background:none;border:none;color:var(--text);cursor:pointer;font:inherit;padding:0}.link-button:hover{color:var(--primary)}.lang-switcher{display:inline-flex;border:1px solid var(--border);border-radius:8px;overflow:hidden}.lang-switcher button{background:transparent;color:var(--text-muted);border:none;padding:.3rem .6rem;cursor:pointer;font-size:.8rem;font-weight:600}.lang-switcher button.active{background:var(--primary);color:var(--primary-ink)}.disclaimer-banner{background:var(--surface-2);color:var(--text-muted);font-size:.8rem;text-align:center;padding:.5rem 1rem;border-bottom:1px solid var(--border)}.app-main{flex:1;width:100%;max-width:960px;margin:0 auto;padding:2rem 1.5rem}.centered-state{display:grid;place-items:center;min-height:40vh;color:var(--text-muted)}.btn{display:inline-block;padding:.7rem 1.3rem;border-radius:10px;font-weight:600;cursor:pointer;border:1px solid transparent;font-size:1rem}.btn-primary{background:var(--primary);color:var(--primary-ink)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}.hero{text-align:center;padding:3rem 0 2rem}.hero h1{font-size:2.6rem;margin:0 0 1rem}.hero-subtitle{font-size:1.2rem;color:var(--text-muted);max-width:620px;margin:0 auto 2rem}.hero-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:3rem}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem}.feature-card h3{margin-top:0}.feature-card p{color:var(--text-muted);margin-bottom:0}.auth-card{max-width:420px;margin:2rem auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:2rem}.auth-card h2{margin-top:0}.auth-card form{display:flex;flex-direction:column;gap:1rem}.auth-card label{display:flex;flex-direction:column;gap:.35rem;font-size:.9rem;color:var(--text-muted)}input,textarea{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.7rem .8rem;color:var(--text);font:inherit}input:focus,textarea:focus{outline:none;border-color:var(--accent-blue)}.field-hint{font-size:.75rem;color:var(--text-muted)}.form-error{color:var(--danger);font-size:.9rem;margin:0}.auth-switch{margin-top:1.5rem;text-align:center;color:var(--text-muted);font-size:.9rem}.auth-switch a{color:var(--accent-blue);font-weight:600}.chat{display:flex;flex-direction:column;gap:1rem;height:calc(100vh - 220px);min-height:420px}.chat-thread{flex:1;overflow-y:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;display:flex;flex-direction:column;gap:.75rem}.chat-empty{margin:auto;color:var(--text-muted)}.chat-bubble{max-width:80%;padding:.6rem .9rem;border-radius:12px}.chat-bubble p{margin:.25rem 0 0;white-space:pre-wrap}.chat-author{font-size:.7rem;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted)}.chat-user{align-self:flex-end;background:var(--accent-blue)}.chat-assistant{align-self:flex-start;background:var(--surface-2)}.chat-input{display:flex;gap:.75rem;align-items:flex-end}.chat-input textarea{flex:1;resize:none}