:root {
  --bg: #0b1020;
  --bg-soft: #121833;
  --text: #e6edf3;
  --muted: #9fb2c8;
  --primary: #0ea5e9;
  --primary-600: #0284c7;
  --card: #0f152b;
  --border: #19213f;
  --shadow: 0 10px 30px rgba(2, 132, 199, 0.2);
}
[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-soft: #eef2f9;
  --text: #0f172a;
  --muted: #536383;
  --primary: #0ea5e9;
  --primary-600: #0284c7;
  --card: #ffffff;
  --border: #e5e8f0;
  --shadow: 0 10px 30px rgba(2, 132, 199, 0.15);
}
* { box-sizing: border-box }
html, body { height: 100% }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  color: var(--text);
  background:
    radial-gradient(80% 50% at 20% 0%, rgba(14,165,233,0.15) 0%, rgba(14,165,233,0) 60%),
    radial-gradient(60% 40% at 80% 20%, rgba(2,132,199,0.12) 0%, rgba(2,132,199,0) 70%),
    linear-gradient(180deg, var(--bg) 0%, #0c142a 100%);
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px }
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(15, 21, 43, 0.8);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 20px; align-items: center; padding: 14px 0 }
.brand { display: flex; align-items: center; gap: 8px }
.logo { font-weight: 700; font-size: 20px; letter-spacing: 0.2px }
.badge { font-size: 12px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted) }
.nav { display: none; gap: 16px }
.nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: 999px; transition: all .2s ease; border: 1px solid transparent }
.nav a:hover { color: var(--text); background: rgba(14,165,233,0.10); border-color: var(--border) }
.nav a.active { color: #fff; background: var(--primary); border-color: var(--primary-600); box-shadow: var(--shadow) }
.actions { display: flex; gap: 10px }
.btn {
  appearance: none; border: 1px solid var(--border); background: var(--card);
  color: var(--text); padding: 10px 14px; border-radius: 8px; text-decoration: none; display: inline-flex; align-items: center; gap: 8px;
}
.btn:hover { border-color: var(--primary-600); transform: translateY(-1px) }
.btn.primary { background: var(--primary); border-color: var(--primary-600); color: white; box-shadow: var(--shadow) }
.btn.ghost { background: transparent }
.hero { padding: 64px 0 }
.hero-inner { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 28px; align-items: center }
.hero-text h1 { font-size: 40px; line-height: 1.15; margin: 0 0 12px }
.hero-text p { color: var(--muted); margin: 0 0 18px }
.cta { display: flex; gap: 12px; flex-wrap: wrap }
.card {
  border: 1px solid var(--border); border-radius: 12px; background: linear-gradient(180deg, var(--card) 0%, #0b1226 100%);
  box-shadow: 0 8px 25px rgba(0,0,0,0.25);
}
.card-header { padding: 12px 16px; border-bottom: 1px solid var(--border); color: var(--muted) }
.card-body { padding: 16px }
.list { margin: 0; padding-left: 18px }
.list li { margin: 6px 0; color: var(--text) }
.features { padding: 30px 0 }
.features h2, .arch h2, .docs .toc-title, .roadmap h2 { font-size: 24px; margin: 0 0 16px }
.grid { display: grid; grid-template-columns: 1fr; gap: 14px }
.feature { border: 1px solid var(--border); border-radius: 12px; padding: 14px; background: var(--card) }
.feature h3 { margin: 0 0 8px; font-size: 18px }
.arch { padding: 30px 0 }
.arch-grid { display: grid; grid-template-columns: 1fr; gap: 14px }
pre, code { font-family: ui-monospace, Menlo, Consolas, "SF Mono", monospace; font-size: 13px }
pre { margin: 0; padding: 12px; border-radius: 12px; background: #0b1226; border: 1px solid var(--border); overflow: auto }
.docs { padding: 24px 0 }
.docs-grid { display: grid; grid-template-columns: 1fr; gap: 16px }
.toc { border: 1px solid var(--border); border-radius: 12px; background: var(--card); padding: 14px }
.toc-title { color: var(--muted); margin-bottom: 8px }
.search { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 8px; background: #0b1226; color: var(--text); margin-bottom: 10px }
[data-theme="light"] .search { background: #f7fafd }
.toc a { display: block; padding: 6px 8px; color: var(--muted); text-decoration: none; border-radius: 8px }
.toc a:hover { color: var(--text); background: #0b1226 }
.doc { border: 1px solid var(--border); border-radius: 12px; background: var(--card); padding: 16px }
.markdown h1, .markdown h2, .markdown h3 { margin-top: 20px }
.markdown p { color: var(--text) }
.markdown a { color: var(--primary) }
.markdown ul { padding-left: 20px }
.roadmap { padding: 24px 0 }
.site-footer { border-top: 1px solid var(--border); margin-top: 20px; background: rgba(15, 21, 43, 0.6) }
.footer-inner { display: flex; gap: 18px; align-items: center; justify-content: space-between; padding: 14px 0 }
.usage, .setup, .security, .faq { padding: 30px 0 }
.plan, .competition, .feedback { padding: 30px 0 }
.faq-grid { display: grid; grid-template-columns: 1fr; gap: 14px }
.feature:hover, .card:hover { border-color: var(--primary-600) }
code.hljs { background: transparent }
.plan-grid { display: grid; grid-template-columns: 1fr; gap: 10px }
details { border: 1px solid var(--border); border-radius: 12px; background: var(--card); padding: 10px }
summary { cursor: pointer; font-weight: 600; color: var(--text) }
.metrics { font-family: ui-monospace, monospace; color: var(--muted) }
.form { border: 1px solid var(--border); border-radius: 12px; background: var(--card); padding: 16px }
.form-row { display: grid; grid-template-columns: 1fr; gap: 12px }
.form-field { display: flex; flex-direction: column; gap: 6px }
.form-field label { color: var(--muted); font-size: 14px }
.form-field input, .form-field textarea {
  background: #0b1226; border: 1px solid var(--border); border-radius: 8px; padding: 10px; color: var(--text);
}
[data-theme="light"] .form-field input, [data-theme="light"] .form-field textarea { background: #f7fafd }
.form-field input::placeholder, .form-field textarea::placeholder { color: var(--muted) }
.form-actions { display: flex; gap: 10px; align-items: center; margin-top: 8px }
.muted { color: var(--muted) }
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  display: none; padding: 10px 12px; border-radius: 999px; background: var(--primary); color: #fff; border: none;
  box-shadow: var(--shadow);
}
.back-to-top.show { display: inline-flex }
.progressbar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%; background: var(--primary); z-index: 80;
}
.menu-toggle { display: inline-flex; align-items: center; gap: 6px; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); color: var(--text) }
@media (max-width: 767px) {
  .nav { display: none }
  .nav.open { display: grid; grid-template-columns: 1fr; padding: 8px; background: rgba(15,21,43,0.9); position: absolute; top: 56px; left: 0; right: 0 }
}
.modal { position: fixed; inset: 0; display: none; align-items: center; justify-content: center; z-index: 90 }
.modal .modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.6) }
.modal .modal-dialog { position: relative; z-index: 91; width: 96%; max-width: 540px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); box-shadow: var(--shadow) }
.modal .modal-header { padding: 12px 16px; border-bottom: 1px solid var(--border) }
.modal .modal-body { padding: 16px }
.modal .modal-footer { padding: 12px 16px; border-top: 1px solid var(--border); display: flex; gap: 10px; justify-content: flex-end }
.modal.show { display: flex }
.hidden { display: none }
.feature-map, .demo, .commands { padding: 30px 0 }
@media (min-width: 768px) {
  .nav { display: flex }
  .hero-inner { grid-template-columns: 1.3fr 0.7fr }
  .grid { grid-template-columns: repeat(2, 1fr) }
  .arch-grid { grid-template-columns: repeat(2, 1fr) }
  .docs-grid { grid-template-columns: 260px 1fr }
  .faq-grid { grid-template-columns: repeat(3, 1fr) }
  .form-row { grid-template-columns: 1fr 1fr }
}