/* ===== AI Center — modern dark theme ===== */
:root{
  --bg:#0b0f17; --bg2:#111827; --card:#151c2b; --border:#23304a;
  --text:#e5edf8; --muted:#93a4bd;
  --accent:#38bdf8; --accent2:#a78bfa; --grad:linear-gradient(90deg,#38bdf8,#a78bfa);
  --green:#34d399; --red:#f87171; --orange:#fbbf24; --blue:#60a5fa; --purple:#c084fc;
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
h1,h2,h3{font-family:'Space Grotesk',sans-serif;line-height:1.2;margin-bottom:.6rem}
h1{font-size:clamp(2rem,5vw,3.2rem)} h2{font-size:clamp(1.4rem,3vw,2rem)}
p{color:var(--muted);margin-bottom:1rem}
a{color:var(--accent);text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,15,23,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:'Space Grotesk';font-size:1.35rem;font-weight:700;color:var(--text)}
.logo span{color:var(--accent)}
nav#menu{display:flex;gap:24px}
#menu a{color:var(--muted);font-weight:500}
#menu a:hover{color:var(--text)}
.menu-btn{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer}

/* hero */
.hero{padding:80px 0 60px;background:radial-gradient(1000px 500px at 70% -10%,rgba(56,189,248,.12),transparent),radial-gradient(800px 400px at 10% 10%,rgba(167,139,250,.1),transparent)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.15em;font-size:.75rem;font-weight:600;color:var(--accent)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.1rem}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin:24px 0 32px}
.stats{display:flex;gap:36px}
.stats strong{display:block;font-size:1.6rem;font-family:'Space Grotesk'}
.stats span{color:var(--muted);font-size:.85rem}

/* chat demo card */
.hero-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:0 20px 60px rgba(0,0,0,.45)}
.chat-demo{display:flex;flex-direction:column;gap:12px}
.msg{max-width:88%;padding:10px 14px;border-radius:14px;font-size:.9rem;animation:pop .5s ease both}
.msg.user{align-self:flex-end;background:var(--grad);color:#08101f;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:var(--bg2);border:1px solid var(--border);border-bottom-left-radius:4px}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1}}

/* sections & cards */
.section{padding:64px 0}
.section.alt{background:var(--bg2)}
.grid.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-top:24px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-4px);border-color:var(--accent)}
.card.full{margin-bottom:22px}
.card h3 a,.card h2 a{color:var(--text)}
.tag{display:inline-block;padding:3px 12px;border-radius:999px;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px}
.tag.green{background:rgba(52,211,153,.15);color:var(--green)}
.tag.red{background:rgba(248,113,113,.15);color:var(--red)}
.tag.blue{background:rgba(96,165,250,.15);color:var(--blue)}
.tag.purple{background:rgba(192,132,252,.15);color:var(--purple)}
.tag.orange{background:rgba(251,191,36,.15);color:var(--orange)}
.meta{font-size:.8rem;color:var(--muted)}
.highlight{border-color:rgba(248,113,113,.4)}
.biglist li{margin:0 0 14px 22px;color:var(--muted)}

/* callout */
.callout{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.checklist{list-style:none}
.checklist li{padding:12px 16px;background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:10px}

/* newsletter */
.newsletter{text-align:center;max-width:640px}
#newsletterForm{display:flex;gap:10px;margin-top:18px}
#newsletterForm input{flex:1;padding:13px 16px;border-radius:12px;border:1px solid var(--border);background:var(--bg2);color:var(--text);font-size:1rem}
.form-msg{color:var(--green);min-height:1.4em}

/* buttons */
.btn{display:inline-block;padding:13px 26px;border-radius:12px;font-weight:600;border:none;cursor:pointer;font-size:1rem;transition:opacity .2s}
.btn:hover{opacity:.85}
.btn.primary{background:var(--grad);color:#08101f}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}

/* footer */
footer{border-top:1px solid var(--border);padding:32px 0;color:var(--muted);font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

@media(max-width:840px){
  .hero-grid,.callout{grid-template-columns:1fr}
  .menu-btn{display:block}
  nav#menu{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg2);flex-direction:column;padding:20px;border-bottom:1px solid var(--border)}
  nav#menu.open{display:flex}
  #newsletterForm{flex-direction:column}
  .stats{gap:20px}
}