/* ==========================================================================
   openbtk.ai — shared design system
   One stylesheet for the whole site (Home, OpenBTK, Roadmap, Ecosystem).
   ========================================================================== */

:root {
  --bg-base: #0a0e17;
  --bg-base-alt: #0d1220;
  --bg-panel: rgba(30, 41, 59, 0.55);
  --bg-panel-solid: #10192e;
  --border-soft: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);

  --accent-blue: #3b82f6;
  --accent-violet: #8b5cf6;
  --accent-gradient: linear-gradient(120deg, var(--accent-blue), var(--accent-violet));

  --text-primary: #f1f5f9;
  --text-dim: #94a3b8;
  --text-faint: #64748b;

  --status-done-bg: rgba(34, 197, 94, 0.12);
  --status-done-fg: #4ade80;
  --status-progress-bg: rgba(59, 130, 246, 0.14);
  --status-progress-fg: #60a5fa;
  --status-planned-bg: rgba(148, 163, 184, 0.12);
  --status-planned-fg: #94a3b8;

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.75rem; font-weight: 700; }
p { margin: 0 0 1rem; }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

.section {
  padding: 5rem 0;
  border-top: 1px solid var(--border-soft);
  scroll-margin-top: 5rem;
}

.section-head {
  max-width: 720px;
  margin: 0 auto 3rem;
  text-align: center;
}

.section-head h2 { font-size: 2rem; }
.section-head p { color: var(--text-dim); font-size: 1.05rem; }

/* --------------------------- Navbar --------------------------- */

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background-color: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand-mark { width: 30px; height: 30px; flex-shrink: 0; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  position: relative;
}

.brand-word {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--text-primary); }

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -0.6rem;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

.nav-cta {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
}
.nav-cta:hover { border-color: var(--border-strong); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.65rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* --------------------------- Buttons --------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s, border-color 0.2s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent-gradient);
  color: #06070d;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-color: var(--border-soft);
}
.btn-secondary:hover { border-color: var(--border-strong); }

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: center;
}

/* --------------------------- Badges / status pills --------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(139, 92, 246, 0.14);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.3);
  margin-bottom: 1.5rem;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #c4b5fd;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.status-pill {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}
.status-live { background: var(--status-progress-bg); color: var(--status-progress-fg); }
.status-progress { background: var(--status-progress-bg); color: var(--status-progress-fg); }
.status-done { background: var(--status-done-bg); color: var(--status-done-fg); }
.status-planned { background: var(--status-planned-bg); color: var(--status-planned-fg); }

/* --------------------------- Hero --------------------------- */

.hero {
  position: relative;
  text-align: center;
  padding: 3rem 1.5rem;
  overflow: hidden;
  min-height: calc(100vh - 65px);
  min-height: calc(100svh - 65px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 0%, rgba(59, 130, 246, 0.16), transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(139, 92, 246, 0.14), transparent 40%),
    var(--bg-base);
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.hero > *:not(.hero-bg) { position: relative; z-index: 1; }

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  letter-spacing: -0.02em;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.install-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-panel-solid);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border: 1px solid var(--border-soft);
  color: #a5b4fc;
}
.install-chip::before { content: "$"; color: var(--text-faint); }

/* --------------------------- Cards / grids --------------------------- */

.grid {
  display: grid;
  gap: 1.5rem;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); }

.card .icon { font-size: 1.75rem; margin-bottom: 0.9rem; }
.card h4 { font-size: 1.1rem; margin-bottom: 0.4rem; }
.card p { color: var(--text-dim); font-size: 0.95rem; margin: 0; }

.card-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.card-list li { padding: 0.15rem 0; padding-left: 1.1rem; position: relative; }
.card-list li::before {
  content: "";
  position: absolute; left: 0; top: 0.65em;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent-blue);
}

/* Product / lineup cards (Home + Ecosystem) */
.product-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.product-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.product-card h3 { margin: 0; font-size: 1.3rem; }
.product-card p { color: var(--text-dim); margin: 0; font-size: 0.95rem; }
.product-card .role { color: var(--text-faint); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.05em; }
.product-card-link {
  margin-top: auto;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-blue);
  text-decoration: none;
}

/* Persona cards */
.persona-card { background: var(--bg-panel); border: 1px solid var(--border-soft); border-radius: var(--radius-md); padding: 1.5rem; }
.persona-card .name { font-weight: 700; font-size: 1.05rem; }
.persona-card .role { color: var(--accent-blue); font-size: 0.85rem; font-weight: 600; margin-bottom: 0.6rem; }
.persona-card p { color: var(--text-dim); font-size: 0.9rem; margin: 0; }

/* --------------------------- Architecture diagram (Mermaid) --------------------------- */

.arch-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 2rem 1rem;
  max-width: 620px;
  margin: 0 auto;
  overflow-x: auto;
}

.mermaid { display: block; text-align: center; }
.mermaid svg {
  max-width: 100% !important;
  width: 100% !important;
  height: auto !important;
  display: inline-block;
}
.mermaid .mm-sub { font-size: 0.78em; opacity: 0.75; font-weight: 400; }

/* Animate the connecting edges so data visibly "flows" down the stack */
.mermaid svg .edgePath .path,
.mermaid svg path.flowchart-link {
  stroke-dasharray: 6 5;
  animation: arch-flow 1.4s linear infinite;
}

@keyframes arch-flow {
  to { stroke-dashoffset: -22; }
}

@media (prefers-reduced-motion: reduce) {
  .mermaid svg .edgePath .path,
  .mermaid svg path.flowchart-link {
    animation: none;
  }
}

/* --------------------------- Code blocks --------------------------- */

.code-block {
  position: relative;
  background: #070a12;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: left;
}
.code-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border-soft);
  font-size: 0.78rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
}
.copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  font-family: var(--font-sans);
}
.copy-btn:hover { color: var(--text-primary); border-color: var(--border-strong); }

.code-block pre {
  margin: 0;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.87rem;
  line-height: 1.6;
}
.code-block code { color: #dbeafe; }
.tok-kw { color: #c4b5fd; }
.tok-str { color: #86efac; }
.tok-com { color: #64748b; font-style: italic; }
.tok-fn { color: #93c5fd; }

.code-caption {
  text-align: center;
  color: var(--text-faint);
  font-size: 0.82rem;
  margin-top: 0.75rem;
}

/* --------------------------- Comparison table --------------------------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--border-soft); border-radius: var(--radius-md); }
table.compare { width: 100%; border-collapse: collapse; min-width: 720px; font-size: 0.9rem; }
table.compare th, table.compare td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
}
table.compare th { background: var(--bg-panel-solid); color: var(--text-primary); font-weight: 600; }
table.compare td { color: var(--text-dim); }
table.compare tr:last-child td { border-bottom: none; }
table.compare td:first-child, table.compare th:first-child { color: var(--text-primary); font-weight: 600; white-space: nowrap; }

/* --------------------------- Footer --------------------------- */

footer {
  border-top: 1px solid var(--border-soft);
  padding: 3rem 1.5rem 2rem;
  margin-top: 2rem;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-col h5 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); margin-bottom: 0.9rem; }
.footer-col a { display: block; color: var(--text-dim); text-decoration: none; font-size: 0.9rem; margin-bottom: 0.55rem; }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border-soft);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.82rem;
  line-height: 1.7;
}

/* --------------------------- Utility --------------------------- */

.text-center { text-align: center; }
.mt-lg { margin-top: 3rem; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }

/* --------------------------- Responsive --------------------------- */

@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .two-col { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg-base-alt);
    border-bottom: 1px solid var(--border-soft);
    padding: 0.5rem 1.5rem 1rem;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { width: 100%; padding: 0.6rem 0; border-bottom: 1px solid var(--border-soft); }
  .nav-links li:last-child { border-bottom: none; }
  .nav-links a[aria-current="page"]::after { display: none; }

  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { flex-direction: column; }
}