:root{--bg:#0C101E;--bg2:#132336;--text:#fff;--muted:#C4C8D0;--teal:#00C8D4;--line:#22364E;--card:#132336}
body.light{--bg:#F5F6F8;--bg2:#fff;--text:#0C101E;--muted:#555B66;--line:#E8EAED;--card:#fff}
*{box-sizing:border-box}body{margin:0;font-family:Barlow,sans-serif;background:var(--bg);color:var(--text)}
body.lang-gr{font-family:'Noto Sans',Barlow,sans-serif}
.container{max-width:1160px;margin:auto;padding:0 20px}.row{display:flex;align-items:center;gap:12px}
.top{position:sticky;top:0;background:var(--bg);border-bottom:1px solid var(--line);z-index:20}.top .row{padding:12px 0}
.logo{height:52px}.nav{display:flex;gap:8px;overflow:auto}.pill{padding:8px 12px;border-radius:999px;border:1px solid rgba(0,200,212,.5);background:rgba(0,200,212,.12);font-size:12px;color:var(--teal);font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.burger{display:none;background:transparent;border:1px solid var(--line);color:var(--text);padding:6px 10px;border-radius:8px}
.cta{margin-left:auto;background:var(--teal);color:#0C101E;padding:10px 12px;border-radius:10px;font-weight:700}.theme{background:transparent;border:1px solid var(--line);color:var(--text);padding:8px 10px;border-radius:10px}
.lang-switch{display:flex;gap:6px}.lang{background:transparent;color:var(--text);border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-size:12px}.lang.active{background:var(--teal);color:#0C101E;border-color:transparent}
.hero{padding:56px 0;background:linear-gradient(180deg,var(--bg),var(--bg2))}.eyebrow{color:#33D4DE;font-size:12px;text-transform:uppercase;letter-spacing:.14em}.hero h1{font-family:'Barlow Condensed',Barlow,sans-serif;font-size:58px;line-height:1.02;margin:.2em 0 .35em}.hero p{font-size:20px;color:var(--muted)}
.chat{background:#111c2b;border:1px solid #2b425b;border-radius:16px;padding:14px}.hero-chat{max-width:900px;margin:10px auto 18px}
.chat-head{display:flex;justify-content:space-between;align-items:center}.chat-head h3{margin:0}.live{font-size:12px;color:#65e6f0}
.chat-window{border:1px solid #2f4a65;border-radius:12px;padding:12px;height:300px;overflow:auto;background:#0e1724;color:#dce9f7;margin:10px 0;display:flex;flex-direction:column;gap:8px}
.chat-msg{max-width:84%;padding:10px 12px;border-radius:14px;font-size:14px;line-height:1.35}.chat-msg.bot{background:#1b2d43;align-self:flex-start}.chat-msg.user{background:#2b4f73;align-self:flex-end}
.quick-row{display:flex;gap:6px;flex-wrap:wrap}.quick{border:1px solid #3f607c;background:#16314b;color:#dce9f7;padding:6px 8px;border-radius:8px;font-size:11px;cursor:pointer}
.chat-input-row{display:flex;gap:8px;margin:10px 0}.chat-input-row input{flex:1;padding:12px;border-radius:10px;border:1px solid #385878;background:#13283d;color:#fff}
.btn{padding:10px 12px;border-radius:10px;font-weight:700;border:none;cursor:pointer}.primary{background:var(--teal);color:#0C101E}.ghost{border:1px solid var(--line);color:var(--text);background:transparent}
body.light .chat{background:#fff;border-color:#d9e2eb} body.light .chat-window{background:#f8fbff;color:#203247;border-color:#dbe5ef}
body.light .chat-msg.bot{background:#eaf2fb} body.light .chat-msg.user{background:#d5e8fb}
body.light .chat-input-row input{background:#fff;color:#0C101E;border-color:#c7d3df}
.section{padding:48px 0}.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}.card h3{margin:.2em 0 .5em}.card p,.lede{color:var(--muted)}
.demo-bottom{border-top:1px solid var(--line)}.demo-wrap{max-width:700px}.lead input,.lead select{width:100%;margin:7px 0;padding:10px;border-radius:8px;border:1px solid #385878;background:#13283d;color:#fff}
body.light .lead input, body.light .lead select{background:#fff;color:#0C101E;border-color:#c7d3df}
.foot{padding:24px 0;border-top:1px solid var(--line);color:var(--muted)}
@media(max-width:960px){
  .cards3{grid-template-columns:1fr}.hero h1{font-size:42px}.cta{display:none}.logo{height:46px}.hero-chat{max-width:100%}.chat-window{height:320px}
  .burger{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:74px;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 20px;flex-direction:column;gap:8px}
  .nav.open{display:flex}
}