:root {
  --bg: #0b0f14;
  --bg-alt: #10161d;
  --surface: #151d26;
  --border: #232e3a;
  --text: #e6edf3;
  --text-dim: #9fb0c0;
  --accent: #4fd1c5;
  --accent-strong: #2dd4bf;
  --accent-soft: rgba(79, 209, 197, 0.12);
  --danger-soft: rgba(244, 114, 182, 0.14);
  --radius: 10px;
  --max-width: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.9em;
  color: var(--accent-strong);
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 12px 0 24px;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.92em;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand-icon { font-size: 1.2rem; }

.main-nav {
  display: flex;
  gap: 22px;
  flex: 1;
  justify-content: center;
}
.main-nav a {
  color: var(--text-dim);
  font-size: 0.92rem;
}
.main-nav a:hover { color: var(--text); text-decoration: none; }

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.lang-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 6px;
  border-radius: 4px;
}
.lang-btn.active { color: var(--accent); }
.lang-btn:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 96px 0 72px;
  text-align: center;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(79, 209, 197, 0.08), transparent 70%),
    var(--bg);
}
.version-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid rgba(79, 209, 197, 0.3);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--accent-strong);
  color: #04211d;
}
.btn-primary:hover { background: var(--accent); }
.btn-secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); }
.btn-ghost {
  color: var(--text-dim);
  border-color: transparent;
}
.btn-ghost:hover { color: var(--text); }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.section-intro {
  color: var(--text-dim);
  max-width: 720px;
  font-size: 1.05rem;
  margin-bottom: 40px;
}
.section h3 { font-size: 1.1rem; margin: 28px 0 6px; }
.section h3:first-of-type { margin-top: 0; }

.section-audience {
  margin-top: 36px;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.eyebrow {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-strong);
  margin-bottom: 10px;
}

/* Pipeline diagram */
.pipeline {
  max-width: 640px;
  margin: 0 auto 48px;
}
.pipeline-step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.pipeline-num {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid rgba(79, 209, 197, 0.35);
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 0.92rem;
}
.pipeline-body h3 { margin: 2px 0 6px; font-size: 1rem; }
.pipeline-body p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }
.pipeline-arrow {
  text-align: center;
  color: var(--accent);
  font-size: 1.2rem;
  line-height: 1;
  padding: 6px 0;
}

/* Concept grid (CRD / template-centric / order) */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 8px;
}
.concept-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.concept-card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.concept-card p { margin: 0 0 14px; color: var(--text-dim); font-size: 0.92rem; }
.concept-card pre { margin: 0; }
.concept-card pre code { font-size: 0.82rem; }

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card-icon {
  font-size: 1.6rem;
  display: block;
  margin-bottom: 12px;
}
.card h3, .card h4 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.94rem; }

/* Install */
.install-more {
  margin-top: 8px;
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* Roadmap */
.roadmap-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.roadmap-col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.roadmap-col h3 { margin-top: 0; }
.roadmap-list { list-style: none; margin: 0; padding: 0; }
.roadmap-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.94rem;
  color: var(--text-dim);
}
.roadmap-list li:last-child { border-bottom: none; }
.roadmap-list strong { color: var(--text); }
.roadmap-empty { color: var(--text-dim); font-size: 0.94rem; }
.changelog-link { margin-top: 24px; color: var(--text-dim); font-size: 0.9rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* Responsive */
@media (max-width: 720px) {
  .main-nav { display: none; }
  .before-after { grid-template-columns: 1fr; }
  .ba-arrow { display: none; }
  .roadmap-cols { grid-template-columns: 1fr; }
}