:root {
  --bg: #0b0f14;
  --bg-elev: #121822;
  --border: #232c3a;
  --text: #e8edf5;
  --text-dim: #9aa7bb;
  --accent: #4f8cff;
  --accent-dark: #3a6fd1;
  --radius: 12px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7f9fc;
    --bg-elev: #ffffff;
    --border: #e2e7ef;
    --text: #10151f;
    --text-dim: #57647a;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --border: #e2e7ef;
  --text: #10151f;
  --text-dim: #57647a;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0b0f14;
  --bg-elev: #121822;
  --border: #232c3a;
  --text: #e8edf5;
  --text-dim: #9aa7bb;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); }

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-weight: 700;
  font-size: 20px;
  text-decoration: none;
  color: var(--text);
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-lg { padding: 14px 28px; font-size: 18px; }

.hero {
  padding: 72px 20px 48px;
  text-align: center;
}
.hero h1 {
  font-size: 40px;
  margin: 0 0 16px;
}
.hero-sub {
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 17px;
}

.protocols { padding: 40px 20px; }
.protocols h2, .pricing h2, .payments h2, .faq h2 {
  font-size: 26px;
  margin-bottom: 20px;
}
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.protocol-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.protocol-card h3 { margin-top: 0; }
.devices-note {
  margin-top: 20px;
  color: var(--text-dim);
}

.pricing { padding: 40px 20px; }
.pricing-note { color: var(--text-dim); margin-top: -8px; }
.plan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0 32px;
}
.plan-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.plan-card h3 { margin: 0 0 4px; }
.plan-price {
  font-size: 24px;
  font-weight: 700;
  margin: 8px 0 16px;
}
.plan-selects {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.plan-selects select {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.xray-heading { margin-top: 40px; }

.payments { padding: 40px 20px; }
.payment-list {
  padding-left: 20px;
  color: var(--text-dim);
}
.payments-note { color: var(--text-dim); }

.faq { padding: 40px 20px 64px; }
.faq details {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 10px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
}
.faq p {
  color: var(--text-dim);
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  color: var(--text-dim);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-links a {
  color: var(--text-dim);
  margin-right: 16px;
  text-decoration: none;
}
.footer-links a:hover { color: var(--text); }

@media (max-width: 480px) {
  .hero h1 { font-size: 30px; }
  .site-footer { flex-direction: column; }
}