:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --text: #e8eef4;
  --muted: #9aadb8;
  --accent: #3ecf8e;
  --accent-dim: #2a9d6a;
  --warn: #f0b429;
  --border: #2a3540;
  --radius: 12px;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(ellipse at top, #1a2836 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { color: var(--muted); font-size: 0.95rem; }
nav a:hover { color: var(--text); }
main { flex: 1; width: min(920px, 100%); margin: 0 auto; padding: 2rem 1.25rem; }
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 0.5rem; }
.hero p.lead { color: var(--muted); font-size: 1.1rem; max-width: 36rem; }
.banner {
  background: #2a2410;
  border: 1px solid #5c4a1a;
  color: var(--warn);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1rem 0;
}
.grid { display: grid; gap: 1rem; }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #062016;
  font-weight: 600;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { background: var(--accent-dim); color: #fff; text-decoration: none; }
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
label { display: block; margin: 0.75rem 0 0.25rem; color: var(--muted); font-size: 0.9rem; }
input, select, textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}
.price { font-variant-numeric: tabular-nums; font-weight: 600; }
.muted { color: var(--muted); }
.alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  margin: 1rem 0;
}
.alert.warn { background: #2a2410; border: 1px solid #5c4a1a; color: var(--warn); }
.alert.ok { background: #123025; border: 1px solid #2a6b4a; color: var(--accent); }
ul.clean { list-style: none; padding: 0; }
ul.clean li { padding: 0.4rem 0; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; gap: 1rem; }
.example-tag {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: #243040;
  color: var(--muted);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  vertical-align: middle;
}