:root{
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #7c3aed;
  --card: #f8fafc;
  --radius: 10px;
}
:root[data-theme="dark"]{
  --bg: #0b1220;
  --text: #e6eef8;
  --muted: #9aa7bb;
  --accent: #8b5cf6;
  --card: #071226;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:linear-gradient(180deg,var(--bg),var(--card));
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
}

/* Layout */
.container{max-width:1000px;margin:0 auto;padding:1.5rem}
.header-inner{display:flex;align-items:center;gap:1rem;justify-content:space-between}
.brand{font-weight:700;color:var(--accent);text-decoration:none;font-size:1.15rem}
.nav a{margin:0 .5rem;color:var(--muted);text-decoration:none}
.controls button{background:transparent;border:0;font-size:1.1rem;cursor:pointer;color:var(--muted)}

.hero{padding:3.5rem 0;text-align:center}
.hero h1{font-size:clamp(1.6rem,3vw,2.4rem);margin:.2rem 0}
.hero p{color:var(--muted);max-width:70ch;margin:0.5rem auto}

.btn{
  display:inline-block;
  background:var(--accent);
  color:white;
  padding:.6rem 1rem;
  border-radius:8px;
  text-decoration:none;
  border:0;
  cursor:pointer;
}
.btn-quiet{background:transparent;color:var(--text);border:1px solid rgba(0,0,0,0.08)}

.features{padding:1rem 0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1rem}
.card{
  background:var(--card);
  border-radius:var(--radius);
  padding:1rem;
  box-shadow:0 6px 18px rgba(16,24,40,0.06);
}
.about, .contact{padding:1rem 0}

/* Form */
form{display:grid;gap:.75rem;max-width:560px}
label{display:flex;flex-direction:column;font-size:.95rem;color:var(--muted)}
input,textarea{
  margin-top:.4rem;padding:.6rem .7rem;border-radius:8px;border:1px solid rgba(0,0,0,0.08);
  background:transparent;color:var(--text);
}
.actions{display:flex;gap:.6rem;align-items:center}

/* Footer */
.site-footer{padding:1.2rem 0;border-top:1px solid rgba(0,0,0,0.04);color:var(--muted)}

/* Responsive small tweaks */
@media (max-width:640px){
  .header-inner{gap:.5rem}
  .nav{display:none}
}