:root{
  --bg:#0b0c10;
  --text:#eef0f6;
  --muted:#b7bdcc;
  --line:#232636;
  --accent:#d6b36a; /* doré */
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, #1a1d29 0%, var(--bg) 50%);
  color:var(--text);
}

a{color:inherit; text-decoration:none}
.container{max-width:1100px; margin:0 auto; padding:18px}

.header{
  display:flex; align-items:center; justify-content:space-between;
  gap:16px;
}

.brand-link{
  display:flex;
  align-items:center;
  gap:12px;
}

.logo-img{
  width:56px;
  height:auto;
  display:block;
}

.brand-text{
  display:flex;
  flex-direction:column;
  gap:2px;
  line-height:1.1;
}

.brand-title{
  font-weight:800;
  letter-spacing:.3px;
}

.brand-subtitle{
  font-size:12px;
  color:var(--muted);
}

.nav{display:flex; gap:14px; flex-wrap:wrap; justify-content:flex-end}
.nav a{font-size:14px; color:var(--muted)}
.nav a:hover{color:var(--text)}

.hero{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:18px;
  padding:18px;
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
  border:1px solid var(--line);
  border-radius:18px;
}

.hero h1{margin:0 0 8px 0; font-size:42px; line-height:1.05}
.subtitle{margin:0 0 14px 0; color:var(--muted); font-size:16px; line-height:1.5}

.bullets{margin:0 0 16px 18px; color:var(--text)}
.bullets li{margin:6px 0}

.cta{display:flex; gap:10px; flex-wrap:wrap; margin:10px 0 6px}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 14px;
  border-radius:12px;
  border:1px solid var(--line);
  background: transparent;
  font-weight:650;
}

.btn.primary{
  background: linear-gradient(180deg, rgba(214,179,106,.95), rgba(214,179,106,.75));
  color:#0b0c10;
  border-color: rgba(214,179,106,.35);
}
.btn.primary:hover{filter:brightness(1.03)}
.btn.ghost{color:var(--text)}
.btn.ghost:hover{border-color: rgba(214,179,106,.45)}

.note{color:var(--muted); font-size:12px; margin:6px 0 0}

.pill-row{display:flex; gap:8px; flex-wrap:wrap; margin-top:10px}
.pill{
  font-size:12px;
  color:var(--muted);
  border:1px solid var(--line);
  padding:6px 10px;
  border-radius:999px;
  background: rgba(255,255,255,.02);
}

.hero-right{display:flex; align-items:flex-start; justify-content:center}

.book-figure{
  margin:0;
  width:100%;
  border:1px solid var(--line);
  border-radius:18px;
  background: rgba(255,255,255,.02);
  padding:12px;
}

.book-img{
  width:100%;
  height:auto;
  display:block;
  border-radius:14px;
  border:1px solid rgba(214,179,106,.18);
}

.card{
  margin-top:14px;
  padding:18px;
  border-radius:18px;
  background: rgba(255,255,255,.02);
  border:1px solid var(--line);
}

.card h2{margin:0 0 10px 0}
.card h3{margin:0 0 8px 0}

.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}

.small{font-size:12px; color:var(--muted)}

details{border-top:1px solid var(--line); padding:10px 0}
details:first-of-type{border-top:none}
summary{cursor:pointer; color:var(--text); font-weight:650}

.footer{
  margin-top:18px;
  border-top:1px solid var(--line);
  padding-top:16px;
  display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap;
  align-items:flex-start;
}

.footer-left{display:flex; gap:10px; align-items:center; max-width:520px}
.footer-logo{width:44px}

.footer-links{display:flex; gap:14px; flex-wrap:wrap; justify-content:flex-end}
.footer-links a{color:var(--muted); font-size:13px}
.footer-links a:hover{color:var(--text)}

@media (max-width: 900px){
  .hero{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .grid{grid-template-columns:1fr}
  .nav{justify-content:flex-start}
}