/* =========== Base =========== */
:root{
  --bg:#0e1116;
  --card:#171b22;
  --ink:#eaf0f2;
  --muted:#9aa5b1;
  --accent:#2fd17e;
  --focus:#66a3ff;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,'Helvetica Neue',Arial,sans-serif;line-height:1.5}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1100px,92%);margin-inline:auto}
h1,h2,h3{line-height:1.15;margin:0 0 .5rem}
h1{font-size:clamp(1.8rem,3.2vw,2.6rem)}
h2{font-size:clamp(1.4rem,2.4vw,1.8rem);margin-top:1rem}
p{margin:.5rem 0 1rem}

/* =========== Header =========== */
.site-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 0}
.brand{display:flex;gap:.6rem;align-items:center;font-weight:700}
.brand .logo{font-size:1.35rem}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:.9rem 1.1rem;border-radius:12px;border:1px solid transparent;transition:.2s transform,.2s box-shadow;cursor:pointer;font-weight:600}
.btn.small{padding:.55rem .9rem;border-radius:10px;font-size:.95rem}
.btn.primary{background:var(--accent);color:#0a0a0a}
.btn.primary:hover{transform:translateY(-1px);box-shadow:var(--shadow)}

/* =========== Hero =========== */
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:2.2rem;align-items:center;padding:2rem 0}
.lead{color:var(--muted);max-width:60ch}
.bullets{list-style:none;padding:0;margin:1rem 0 1.6rem;display:grid;gap:.35rem;color:#dce2e7}
.hero-media{position:relative}
.book{border-radius:12px;box-shadow:var(--shadow);border:1px solid #232a33}
.price-card{position:absolute;bottom:-.9rem;right:-.6rem;background:var(--card);border:1px solid #202633;border-radius:14px;padding:.6rem .9rem;display:flex;flex-direction:column;align-items:flex-end;box-shadow:var(--shadow)}
.amount{font-weight:800;font-size:1.6rem}
.amount .currency{font-size:1rem;margin-right:.1rem}
.amount .dec{font-size:1.05rem}
.sub{color:var(--muted);font-size:.9rem}

/* =========== Sections =========== */
.about,.buy,.faq{background:transparent;border:1px solid #1c222c;border-radius:16px;padding:1.1rem 1rem;margin:1.6rem 0}
.specs{display:grid;grid-template-columns:repeat(4,1fr);gap:.6rem;margin-top:.8rem}
.spec{background:var(--card);border:1px solid #232a33;border-radius:12px;padding:.8rem}
.spec span{display:block;color:var(--muted);font-size:.85rem;margin-bottom:.2rem}

/* =========== Form =========== */
form{display:grid;gap:.9rem;margin-top:.6rem}
label{display:grid;gap:.3rem;font-weight:600}
input,select,textarea{background:#10151b;border:1px solid #232a33;border-radius:12px;padding:.8rem;color:var(--ink);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--focus);box-shadow:0 0 0 3px rgba(102,163,255,.18)}
.grid{display:grid;gap:.9rem;grid-template-columns:1fr 1fr}
.total-box{background:var(--card);border:1px solid #232a33;border-radius:12px;padding:.8rem;display:grid;grid-template-columns:1fr auto;align-items:center}
.total{font-weight:800;font-size:1.35rem}
.notice{margin-top:1rem;background:#0f1a13;border:1px solid #1f2a24;color:#b6f2cf;padding:.9rem;border-radius:12px}

/* =========== Footer & Modal =========== */
.site-footer{display:flex;align-items:center;justify-content:space-between;padding:1.2rem 0;color:var(--muted);font-size:.95rem}
dialog{border:none;border-radius:14px;max-width:760px;width:92%;background:#0c0f14;color:var(--ink);padding:0}
dialog::backdrop{background:rgba(0,0,0,.55)}
dialog article{padding:1rem}
dialog header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.6rem}
dialog h3{margin:0}
dialog button{background:#121720;border:1px solid #232a33;color:var(--ink);padding:.5rem .7rem;border-radius:10px;cursor:pointer}

.tiny{font-size:.9rem}
.muted{color:var(--muted)}

@media (max-width: 860px){
  .hero{grid-template-columns:1fr}
  .specs{grid-template-columns:repeat(2,1fr)}
  .grid{grid-template-columns:1fr}
}