:root{
  --bg:#0f1420;--card:#161d2e;--line:#26324a;--txt:#e8edf7;--muted:#94a3b8;
  --accent:#4f8cff;--accent2:#6ee7b7;--radius:14px;--maxw:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:radial-gradient(1200px 600px at 70% -10%,#1b2740 0%,var(--bg) 60%);
  color:var(--txt);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;
}
a{color:inherit}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* Header */
header{border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;max-width:var(--maxw);margin:0 auto}
.logo{font-weight:800;font-size:20px;letter-spacing:.3px;display:flex;align-items:center;gap:10px;text-decoration:none}
.logo .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--accent2))}
.menu a{color:var(--muted);text-decoration:none;margin-left:22px;font-size:14px}
.menu a:hover,.menu a.active{color:var(--txt)}

/* Hero / sections */
main{flex:1}
.hero{text-align:center;padding:56px 20px 24px}
.hero h1{font-size:clamp(28px,5vw,48px);line-height:1.1;font-weight:800;margin-bottom:14px}
.hero h1 span{background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{color:var(--muted);font-size:18px;max-width:620px;margin:0 auto}
.page{padding:44px 20px;max-width:820px;margin:0 auto}
.page h1{font-size:32px;margin-bottom:18px}
.page h2{font-size:20px;margin:26px 0 10px}
.page p{color:#cbd5e1;margin-bottom:12px}
.page ul{color:#cbd5e1;margin:0 0 14px 22px}
.page li{margin-bottom:6px}
.lead{color:var(--muted);font-size:17px;margin-bottom:20px}

/* Converter */
.tool{max-width:640px;margin:24px auto 10px}
.drop{background:var(--card);border:1.5px dashed var(--line);border-radius:var(--radius);
  padding:40px 24px;text-align:center;transition:.2s;cursor:pointer}
.drop.drag{border-color:var(--accent);background:#18223a}
.drop .ico{font-size:40px;margin-bottom:10px}
.small{color:var(--muted);font-size:13px;margin-top:12px}
.controls{display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:center;margin:20px 0}
.controls label{font-size:14px;color:var(--muted)}
select,input[type=range]{accent-color:var(--accent)}
select{background:var(--card);color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:14px}
.btn{display:inline-block;background:linear-gradient(135deg,var(--accent),#3b6fe0);color:#fff;border:0;
  padding:12px 26px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.result{margin-top:22px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;display:none}
.result.show{display:block}
.result img{max-width:100%;border-radius:8px;margin-top:12px;border:1px solid var(--line)}
.row{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.privacy-note{max-width:640px;margin:16px auto 0;text-align:center;color:var(--muted);font-size:13px}

/* Formats / features grid */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:34px auto;max-width:var(--maxw);padding:0 20px}
.cell{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}
.cell h3{font-size:15px;margin-bottom:6px}
.cell p{color:var(--muted);font-size:13px}

/* Helpers (чтобы не использовать inline-стили и держать строгий CSP) */
.hidden{display:none !important}
.inline-controls{display:flex;align-items:center;gap:8px}
.center{text-align:center}
.mt14{margin-top:14px}

/* Contact form */
.form{margin-top:20px;max-width:520px}
.field{margin-bottom:12px}
.field label{display:block;color:var(--muted);font-size:14px;margin-bottom:4px}
.field input,.field textarea{width:100%;padding:10px;border-radius:8px;border:1px solid var(--line);
  background:var(--card);color:var(--txt);font-family:inherit;font-size:14px}
.field textarea{resize:vertical}

/* Footer */
footer{border-top:1px solid var(--line);margin-top:36px}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:24px 20px;max-width:var(--maxw);margin:0 auto;color:var(--muted);font-size:13px}
.foot a{color:var(--muted);text-decoration:none;margin-left:16px}
.foot a:hover{color:var(--txt)}