:root{
  --bg:#0b1020;--bg2:#121933;--card:#161e3a;--text:#e8ecff;--muted:#9aa3c7;
  --accent:#6366f1;--accent2:#22d3ee;--warn:#f59e0b;--line:rgba(255,255,255,.08);
  --radius:18px;--shadow:0 20px 50px rgba(0,0,0,.35);
  --font:"Inter","Noto Sans SC",system-ui,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:radial-gradient(1200px 600px at 10% -10%,#1e2a5a 0%,transparent 55%),radial-gradient(900px 500px at 90% 0%,#0e3a4a 0%,transparent 50%),var(--bg);color:var(--text);line-height:1.65}
a{color:inherit;text-decoration:none}.container{width:min(1100px,92%);margin:0 auto}
.nav{position:sticky;top:0;z-index:20;backdrop-filter:blur(14px);background:rgba(11,16,32,.75);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 0}
.logo{display:flex;align-items:center;gap:.6rem;font-weight:700}
.logo-mark{width:2rem;height:2rem;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-weight:800}
.nav-links{display:flex;gap:1.1rem;flex-wrap:wrap;font-size:.95rem;color:var(--muted)}
.nav-links a:hover{color:#fff}.lang-btn{border:1px solid var(--line);background:transparent;color:var(--text);border-radius:999px;padding:.35rem .8rem;cursor:pointer}
.hero{padding:5rem 0 3.5rem}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:2.5rem;align-items:center}
.eyebrow{color:var(--accent2);font-weight:600;letter-spacing:.04em;text-transform:uppercase;font-size:.8rem}
.hero h1{font-size:clamp(2.2rem,5vw,3.4rem);line-height:1.15;margin:.4rem 0 1rem}
.lead{color:var(--muted);font-size:1.08rem;max-width:36rem}.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.2rem;border-radius:999px;font-weight:600;border:1px solid transparent}
.btn.primary{background:linear-gradient(135deg,var(--accent),#818cf8);color:#fff;box-shadow:0 10px 30px rgba(99,102,241,.35)}
.btn.ghost{border-color:var(--line);color:var(--text)}.btn:hover{transform:translateY(-1px)}
.hero-card{position:relative;min-height:280px;border-radius:24px;background:linear-gradient(160deg,rgba(99,102,241,.25),rgba(34,211,238,.12));border:1px solid var(--line);box-shadow:var(--shadow);overflow:hidden;display:grid;place-items:center}
.orbit{position:absolute;inset:18px;border:1px dashed rgba(255,255,255,.18);border-radius:50%;animation:spin 28s linear infinite}
.orbit span{position:absolute;font-size:.75rem;padding:.25rem .55rem;border-radius:999px;background:rgba(0,0,0,.35);border:1px solid var(--line)}
.orbit span:nth-child(1){top:8%;left:42%}.orbit span:nth-child(2){top:38%;right:2%}
.orbit span:nth-child(3){bottom:12%;right:22%}.orbit span:nth-child(4){bottom:18%;left:8%}.orbit span:nth-child(5){top:40%;left:0}
.hero-stat{text-align:center;z-index:1}.hero-stat strong{display:block;font-size:3.5rem;line-height:1;background:linear-gradient(135deg,#fff,var(--accent2));-webkit-background-clip:text;color:transparent}
@keyframes spin{to{transform:rotate(360deg)}}
.section{padding:4rem 0}.section.alt{background:rgba(255,255,255,.02);border-block:1px solid var(--line)}
.section h2{font-size:clamp(1.6rem,3vw,2.2rem);margin:0 0 .6rem}.section-lead{color:var(--muted);max-width:40rem;margin:0 0 2rem}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow)}
.card .step{color:var(--accent2);font-weight:700;font-size:.85rem;letter-spacing:.08em;margin-bottom:.4rem}
.card h3{margin:.2rem 0 .5rem;font-size:1.05rem}.card p{margin:0;color:var(--muted);font-size:.95rem}
.two-col{display:grid;grid-template-columns:1.2fr .8fr;gap:2rem;align-items:start}
.timeline{list-style:none;padding:0;margin:1.2rem 0 0;counter-reset:t}
.timeline li{position:relative;padding:0 0 1.2rem 1.4rem;border-left:2px solid rgba(99,102,241,.35)}
.timeline li::before{content:"";position:absolute;left:-6px;top:.35rem;width:10px;height:10px;border-radius:50%;background:var(--accent)}
.timeline strong{display:block}.timeline span{color:var(--muted)}
.panel{background:linear-gradient(160deg,rgba(34,211,238,.12),rgba(99,102,241,.15));border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem}
.panel ul{margin:.8rem 0 0;padding-left:1.1rem;color:var(--muted)}
.prompt-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.prompt-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1rem}
.prompt-box.good{border-color:rgba(34,211,238,.45)}.prompt-box pre{white-space:pre-wrap;color:var(--muted);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem;margin:.6rem 0 0}
.chips{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.2rem}
.chips span{padding:.4rem .75rem;border-radius:999px;background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--muted);font-size:.9rem}
.pitfalls .card.warn{border-color:rgba(245,158,11,.25)}.pitfalls h3{color:#fbbf24}
.res-list{display:grid;gap:1rem}.res-list>div{display:grid;gap:.25rem;padding:1.1rem 1.2rem;border-radius:var(--radius);background:var(--card);border:1px solid var(--line)}
.res-list span{color:var(--muted)}
.cta-band{padding:3.5rem 0;text-align:center;background:linear-gradient(90deg,rgba(99,102,241,.18),rgba(34,211,238,.12))}
.cta-band p{color:var(--muted);margin:.6rem auto 0;max-width:34rem}
.footer{border-top:1px solid var(--line);padding:1.4rem 0;color:var(--muted);font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
@media (max-width:860px){
  .hero-grid,.two-col,.prompt-grid{grid-template-columns:1fr}
  .nav-links{display:none}.hero{padding-top:3rem}
}

/* demo extras */
.mock {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.mock-bar {
  display: flex; align-items: center; gap: .4rem;
  padding: .65rem .9rem; background: rgba(0,0,0,.25); border-bottom: 1px solid var(--line);
}
.mock-dot { width: .55rem; height: .55rem; border-radius: 50%; background: #f87171; }
.mock-dot:nth-child(2) { background: #fbbf24; }
.mock-dot:nth-child(3) { background: #34d399; }
.mock-title { margin-left: .5rem; color: var(--muted); font-size: .8rem; }
.mock-body { padding: 1rem; display: grid; gap: .75rem; }
.mock-row { display: flex; gap: .75rem; align-items: flex-start; }
.mock-avatar {
  flex: 0 0 2rem; height: 2rem; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: grid; place-items: center; font-size: .75rem; font-weight: 700; color: #fff;
}
.mock-bubble {
  flex: 1; background: rgba(255,255,255,.04); border: 1px solid var(--line);
  border-radius: 12px; padding: .7rem .85rem; color: var(--muted); font-size: .9rem;
}
.mock-bubble strong { color: var(--text); display: block; margin-bottom: .25rem; font-size: .8rem; }
.mock-tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .35rem; }
.mock-tags span {
  font-size: .72rem; padding: .15rem .45rem; border-radius: 999px;
  background: rgba(99,102,241,.2); color: #c7d2fe; border: 1px solid rgba(99,102,241,.35);
}
.arch-steps { display: grid; grid-template-columns: repeat(auto-fit,minmax(160px,1fr)); gap: 1rem; }
.arch-steps .card { text-align: center; }
.arch-steps .step { font-size: 1.1rem; }
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: 1rem; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; text-align: center; }
.kpi strong { display: block; font-size: 1.8rem; background: linear-gradient(135deg,#fff,var(--accent2)); -webkit-background-clip: text; color: transparent; }
.kpi span { color: var(--muted); font-size: .85rem; }
.nav-links a.nav-home { color: var(--accent2); font-weight: 600; }