/* ============================================
   REFInet Pillar — Main Stylesheet
   ============================================ */

:root {
  --bg-void: #020408;
  --bg-surface: #060D14;
  --bg-elevated: #0A1520;
  --accent-cyan: #00F0FF;
  --accent-magenta: #FF006E;
  --accent-green: #00FF88;
  --text-primary: #E8F4F8;
  --text-muted: #4A7A8A;
  --border: #0D3040;
  --font-display: 'Share Tech Mono', monospace;
  --font-body: 'IBM Plex Mono', monospace;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-void);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-cyan); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }
img, svg { max-width: 100%; }

/* ── Utility ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ── Section base ── */
section {
  padding: 100px 0;
  position: relative;
}
.section-title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 48px;
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   NAV
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(2, 4, 8, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(13, 48, 64, 0.5);
  transition: background 0.3s;
}
.nav.scrolled {
  background: rgba(2, 4, 8, 0.92);
  border-bottom-color: var(--border);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-primary);
}
.nav-brand img {
  width: 36px;
  height: 36px;
}
.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-display);
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent-cyan); opacity: 1; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(6, 13, 20, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.3s;
  }
  .nav-links.open { transform: translateY(0); }
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-top: 64px;
}
#mesh-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 24px;
}
.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
  border-radius: 999px;
  padding: 6px 20px;
  margin-bottom: 32px;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: rgba(0, 240, 255, 0.05);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 24px;
  min-height: 3.8rem;
}
.hero h1 .cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent-cyan);
  margin-left: 4px;
  animation: blink 0.8s step-end infinite;
  vertical-align: text-bottom;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: float 2.5s ease-in-out infinite;
}
.scroll-indicator svg { width: 24px; height: 24px; stroke: var(--text-muted); }
@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.9rem;
  padding: 14px 28px;
  border-radius: 6px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.3s;
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-void);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
}
.btn-primary:hover {
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.45);
  opacity: 1;
  transform: translateY(-2px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  opacity: 1;
}
.btn-download {
  background: var(--accent-cyan);
  color: var(--bg-void);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.2);
  font-size: 0.85rem;
  padding: 12px 24px;
}
.btn-download:hover {
  box-shadow: 0 0 32px rgba(0, 240, 255, 0.4);
  opacity: 1;
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  padding: 12px 24px;
}
.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  opacity: 1;
}

/* ============================================
   CARDS GRID — What Is It & Docs
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 768px) { .card-grid { grid-template-columns: 1fr; } }
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px 28px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.1);
}
.card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}
.card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.card p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}
.card-link {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   ARCHITECTURE
   ============================================ */
.arch-diagram {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 40px;
}
.arch-diagram svg { display: block; margin: 0 auto; }
.ports-bar {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 24px;
  text-align: center;
  letter-spacing: 1px;
  max-width: 800px;
  margin: 0 auto;
}

/* ============================================
   DOWNLOAD TABS
   ============================================ */
.tab-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tab-btn {
  font-family: var(--font-display);
  font-size: 0.82rem;
  padding: 12px 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}
.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.tab-panel-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.tab-panel-header h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
}
.badge {
  font-family: var(--font-body);
  font-size: 0.72rem;
  background: rgba(0, 240, 255, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: 999px;
  padding: 4px 12px;
}
.install-note {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 16px 0;
}
.requirements {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  margin-top: 16px;
}
.warning-notice {
  background: rgba(255, 170, 0, 0.08);
  border: 1px solid rgba(255, 170, 0, 0.3);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: #FFAA00;
  margin: 16px 0;
}
.download-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 16px 0;
}
.getting-started-link {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-muted);
}
.getting-started-link a { color: var(--accent-cyan); }

/* ── Mobile tab select ── */
.tab-select-mobile {
  display: none;
  width: 100%;
  font-family: var(--font-display);
  font-size: 0.9rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 24px;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%234A7A8A' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}
@media (max-width: 768px) {
  .tab-nav { display: none; }
  .tab-select-mobile { display: block; }
}

/* ── Terminal code blocks ── */
.code-block {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 16px 0;
  overflow-x: auto;
}
.code-block pre {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--accent-green);
  line-height: 1.6;
  white-space: pre;
  margin: 0;
}
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 4px;
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.copy-btn:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }
.copy-btn.copied { color: var(--accent-green); border-color: var(--accent-green); }

/* ============================================
   WHITEPAPER
   ============================================ */
.whitepaper-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.whitepaper-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.whitepaper-deco {
  font-family: var(--font-display);
  font-size: 6rem;
  color: rgba(0, 240, 255, 0.04);
  text-transform: uppercase;
  letter-spacing: 8px;
  line-height: 1;
  user-select: none;
}
.whitepaper-content h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin-bottom: 16px;
}
.whitepaper-content p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 28px;
}
@media (max-width: 768px) {
  .whitepaper-grid { grid-template-columns: 1fr; }
  .whitepaper-deco { font-size: 3rem; }
}

/* ============================================
   COMMUNITY
   ============================================ */
.community-section { text-align: center; }
.community-section p {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 32px;
  font-size: 0.95rem;
}
.community-ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.footer-brand img { width: 28px; height: 28px; }
.footer-meta { color: var(--text-muted); font-size: 0.78rem; line-height: 1.8; }
.footer-nav { list-style: none; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { color: var(--text-muted); font-size: 0.82rem; }
.footer-nav a:hover { color: var(--accent-cyan); }
.footer-right {
  text-align: right;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-right p { margin-bottom: 12px; }
.footer-bar {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .footer-right { text-align: center; }
}

/* ============================================
   DOC VIEWER (SPA) — GitHub-style documentation
   ============================================ */
.doc-viewer {
  padding-top: 64px;
  min-height: 100vh;
  background: #0d1117;
}

/* ── Top bar ── */
.doc-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  margin-bottom: 0;
  border-bottom: 1px solid #21262d;
  background: #161b22;
  position: sticky;
  top: 64px;
  z-index: 50;
  margin-left: -24px;
  margin-right: -24px;
  padding-left: 24px;
  padding-right: 24px;
}
.doc-back-btn {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.85rem;
  color: #58a6ff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
}
.doc-back-btn:hover { color: #79c0ff; text-decoration: underline; opacity: 1; }
.doc-topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.doc-breadcrumb-sep {
  color: #484f58;
  font-size: 1rem;
  user-select: none;
}
.doc-breadcrumb {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: #c9d1d9;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.doc-github-btn {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  color: #8b949e;
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 5px 12px;
  background: #21262d;
  text-decoration: none;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  transition: background 0.15s, border-color 0.15s;
}
.doc-github-btn:hover {
  background: #30363d;
  border-color: #8b949e;
  color: #c9d1d9;
  opacity: 1;
}

/* ── Sidebar toggle (mobile) ── */
.doc-sidebar-toggle {
  display: none;
  margin-bottom: 0;
  padding: 12px 0;
}
.doc-sidebar-toggle .btn {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  padding: 6px 12px;
  text-transform: none;
  letter-spacing: 0;
  border-color: #30363d;
  color: #c9d1d9;
}

/* ── Layout ── */
.doc-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  align-items: start;
  min-height: calc(100vh - 140px);
}

/* ── Table of Contents (sidebar) ── */
.doc-toc {
  position: sticky;
  top: 120px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  padding: 24px 20px 24px 0;
  border-right: 1px solid #21262d;
  scrollbar-width: thin;
  scrollbar-color: #30363d transparent;
}
.doc-toc::-webkit-scrollbar { width: 6px; }
.doc-toc::-webkit-scrollbar-track { background: transparent; }
.doc-toc::-webkit-scrollbar-thumb { background: #30363d; border-radius: 3px; }
.doc-toc a {
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  color: #8b949e;
  padding: 3px 0;
  line-height: 1.5;
  transition: color 0.15s;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  text-decoration: none;
}
.doc-toc a:hover { color: #58a6ff; opacity: 1; }
.doc-toc a.active {
  color: #f0f6fc;
  font-weight: 600;
  border-left: 2px solid #58a6ff;
  padding-left: 8px;
  margin-left: -10px;
}
.doc-toc a.toc-h1 {
  font-weight: 600;
  color: #c9d1d9;
  padding: 6px 0;
  margin-bottom: 4px;
  font-size: 0.85rem;
}
.doc-toc a.toc-h2 {
  padding-left: 0;
  font-weight: 500;
  color: #c9d1d9;
  padding-top: 6px;
  padding-bottom: 3px;
}
.doc-toc a.toc-h3 { padding-left: 16px; color: #8b949e; }
.doc-toc a.toc-h4 { padding-left: 32px; font-size: 0.75rem; color: #6e7681; }

/* ── Doc content — GitHub markdown body ── */
.doc-content {
  max-width: 100%;
  overflow-x: hidden;
  padding: 32px 0 80px 40px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #c9d1d9;
  word-wrap: break-word;
}
.doc-loading {
  color: #8b949e;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  padding: 80px 0;
  text-align: center;
  font-size: 1rem;
}

/* Headings */
.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-weight: 600;
  line-height: 1.25;
  color: #c9d1d9;
}
.doc-content h1 {
  font-size: 2em;
  margin: 0 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #21262d;
}
.doc-content h2 {
  font-size: 1.5em;
  margin: 24px 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #21262d;
}
.doc-content h3 {
  font-size: 1.25em;
  margin: 24px 0 16px;
}
.doc-content h4 {
  font-size: 1em;
  margin: 24px 0 16px;
  color: #c9d1d9;
}
.doc-content h5 {
  font-size: 0.875em;
  margin: 24px 0 16px;
}
.doc-content h6 {
  font-size: 0.85em;
  margin: 24px 0 16px;
  color: #8b949e;
}

/* Paragraphs and text */
.doc-content p {
  margin: 0 0 16px;
  line-height: 1.5;
  color: #c9d1d9;
}
.doc-content a {
  color: #58a6ff;
  text-decoration: none;
}
.doc-content a:hover { text-decoration: underline; opacity: 1; }
.doc-content strong { color: #c9d1d9; font-weight: 600; }
.doc-content em { font-style: italic; }

/* Lists */
.doc-content ul,
.doc-content ol {
  margin: 0 0 16px;
  padding-left: 2em;
  color: #c9d1d9;
}
.doc-content li {
  margin-bottom: 4px;
  line-height: 1.5;
}
.doc-content li + li { margin-top: 0.25em; }
.doc-content li > p { margin-top: 16px; }
.doc-content li > ul,
.doc-content li > ol { margin-top: 0; margin-bottom: 0; }

/* Task lists (GitHub style checkboxes) */
.doc-content li input[type="checkbox"] {
  margin-right: 0.5em;
  vertical-align: middle;
}

/* Blockquotes */
.doc-content blockquote {
  border-left: 0.25em solid #30363d;
  margin: 0 0 16px;
  padding: 0 1em;
  color: #8b949e;
  background: transparent;
  border-radius: 0;
}
.doc-content blockquote > :first-child { margin-top: 0; }
.doc-content blockquote > :last-child { margin-bottom: 0; }

/* Inline code */
.doc-content code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 85%;
  background: rgba(110, 118, 129, 0.4);
  border: none;
  border-radius: 6px;
  padding: 0.2em 0.4em;
  color: #c9d1d9;
}

/* Code blocks */
.doc-content pre {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 16px;
  margin: 0 0 16px;
  overflow-x: auto;
  position: relative;
  line-height: 1.45;
}
.doc-content pre code {
  background: none;
  border: none;
  padding: 0;
  border-radius: 0;
  font-size: 85%;
  line-height: 1.45;
  color: #c9d1d9;
  word-wrap: normal;
  white-space: pre;
}

/* Copy button for code blocks (in docs) */
.doc-content pre .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: #21262d;
  border: 1px solid #30363d;
  color: #8b949e;
  border-radius: 6px;
  padding: 4px 8px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.7rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s;
}
.doc-content pre:hover .copy-btn { opacity: 1; }
.doc-content pre .copy-btn:hover { background: #30363d; color: #c9d1d9; }
.doc-content pre .copy-btn.copied { color: #3fb950; border-color: #3fb950; opacity: 1; }

/* Tables */
.doc-content table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  margin: 0 0 16px;
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
}
.doc-content thead { display: table-header-group; }
.doc-content tbody { display: table-row-group; }
.doc-content tr { display: table-row; }
.doc-content table { display: table; }
.doc-content th,
.doc-content td {
  padding: 6px 13px;
  border: 1px solid #30363d;
  text-align: left;
  color: #c9d1d9;
}
.doc-content th {
  font-weight: 600;
  background: #161b22;
  color: #c9d1d9;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: inherit;
  text-transform: none;
  letter-spacing: 0;
}
.doc-content tr {
  background: #0d1117;
  border-top: 1px solid #21262d;
}
.doc-content tr:nth-child(2n) {
  background: #161b22;
}
.doc-content tr:hover td {
  background: rgba(110, 118, 129, 0.1);
}

/* Horizontal rules */
.doc-content hr {
  border: none;
  height: 0.25em;
  background: #21262d;
  margin: 24px 0;
  padding: 0;
  overflow: hidden;
  border-radius: 0;
}

/* Images */
.doc-content img {
  max-width: 100%;
  border-radius: 0;
  border-style: none;
  background-color: #0d1117;
}

/* Definition lists */
.doc-content dl {
  padding: 0;
  margin-bottom: 16px;
}
.doc-content dt {
  padding: 0;
  margin-top: 16px;
  font-weight: 600;
  font-style: italic;
}
.doc-content dd {
  padding: 0 16px;
  margin-bottom: 16px;
}

/* Keyboard shortcuts */
.doc-content kbd {
  display: inline-block;
  padding: 3px 5px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 11px;
  line-height: 10px;
  color: #c9d1d9;
  vertical-align: middle;
  background: #161b22;
  border: solid 1px #30363d;
  border-bottom-color: #21262d;
  border-radius: 6px;
  box-shadow: inset 0 -1px 0 #21262d;
}

/* Anchor links on headings (GitHub-style) */
.doc-content .heading-anchor {
  float: left;
  margin-left: -20px;
  padding-right: 4px;
  line-height: 1;
  color: #58a6ff;
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s;
  font-weight: 400;
}
.doc-content h1:hover .heading-anchor,
.doc-content h2:hover .heading-anchor,
.doc-content h3:hover .heading-anchor,
.doc-content h4:hover .heading-anchor,
.doc-content h5:hover .heading-anchor,
.doc-content h6:hover .heading-anchor {
  opacity: 1;
  text-decoration: none;
}
.doc-content .heading-anchor:hover {
  text-decoration: underline;
  opacity: 1;
}

/* ASCII art / wide pre blocks */
.doc-content pre:has(code) {
  tab-size: 8;
}

/* Nested blockquotes */
.doc-content blockquote blockquote {
  margin-top: 8px;
}

/* ── Responsive ── */
@media (max-width: 1012px) {
  .doc-layout { grid-template-columns: 220px 1fr; }
  .doc-content { padding-left: 28px; }
}
@media (max-width: 768px) {
  .doc-sidebar-toggle { display: block; }
  .doc-layout { grid-template-columns: 1fr; }
  .doc-toc {
    position: static;
    max-height: 50vh;
    border-right: none;
    border-bottom: 1px solid #21262d;
    padding: 16px 0;
    margin-bottom: 0;
    display: none;
  }
  .doc-toc.open { display: block; }
  .doc-content { padding: 24px 0 60px; }
  .doc-topbar {
    margin-left: -24px;
    margin-right: -24px;
    padding-left: 24px;
    padding-right: 24px;
  }
  .doc-content pre { font-size: 13px; }
  .doc-content table { font-size: 0.82rem; }
}

/* ============================================
   SECTION CTA (centered button below cards)
   ============================================ */
.section-cta {
  text-align: center;
  margin-top: 40px;
}

/* ============================================
   ARCHITECTURE MODAL
   ============================================ */
.arch-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.arch-modal.open {
  opacity: 1;
  visibility: visible;
}
.arch-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 4, 8, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.arch-modal-container {
  position: relative;
  width: 94vw;
  max-width: 860px;
  max-height: 90vh;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(0, 240, 255, 0.06),
    0 24px 80px rgba(0, 0, 0, 0.6),
    0 0 120px rgba(0, 240, 255, 0.03);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.arch-modal.open .arch-modal-container {
  transform: translateY(0) scale(1);
}

/* Header */
.arch-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-shrink: 0;
}
.arch-modal-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--accent-cyan);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.arch-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.arch-modal-close:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

/* Body */
.arch-modal-body {
  padding: 28px;
  overflow-y: auto;
}
.arch-modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  text-align: center;
}
.arch-modal-diagram {
  margin-bottom: 28px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-elevated);
}
.arch-modal-diagram img {
  display: block;
  width: 100%;
  height: auto;
}

/* Ports bar */
.arch-modal-ports {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 32px;
}
.arch-port {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
}
.arch-port-num {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  font-weight: 600;
}
.arch-port-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Layers list */
.arch-modal-layers {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.arch-layer {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}
.arch-layer:hover {
  border-color: rgba(0, 240, 255, 0.2);
}
.arch-layer-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.15);
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-weight: 600;
}
.arch-layer-content h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
.arch-layer-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}
.arch-layer-content code {
  font-family: var(--font-body);
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.1);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.85em;
  color: var(--accent-cyan);
}

/* Download modal centering */
#dl-modal .arch-modal-body {
  text-align: center;
}
#dl-modal .tab-nav {
  justify-content: center;
}
#dl-modal .tab-panel-header {
  justify-content: center;
}
#dl-modal .download-btns {
  justify-content: center;
}
#dl-modal .install-note,
#dl-modal .warning-notice,
#dl-modal .getting-started-link {
  text-align: center;
}
#dl-modal .code-block {
  text-align: left;
}

/* Doc modals (Whitepaper + Getting Started) — sidebar TOC + content */
.doc-modal-container {
  max-width: 1100px;
  width: 95vw;
}
.doc-modal-body {
  padding: 0;
  overflow: hidden;
}
.doc-modal-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  height: calc(90vh - 64px);
}
.doc-modal-toc {
  overflow-y: auto;
  padding: 24px 16px 24px 20px;
  border-right: 1px solid #21262d;
  scrollbar-width: thin;
  scrollbar-color: #30363d transparent;
}
.doc-modal-toc::-webkit-scrollbar { width: 6px; }
.doc-modal-toc::-webkit-scrollbar-track { background: transparent; }
.doc-modal-toc::-webkit-scrollbar-thumb { background: #30363d; border-radius: 3px; }
.doc-modal-toc a {
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  color: #8b949e;
  padding: 3px 0;
  line-height: 1.5;
  transition: color 0.15s;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  text-decoration: none;
}
.doc-modal-toc a:hover { color: #58a6ff; opacity: 1; }
.doc-modal-toc a.active {
  color: #f0f6fc;
  font-weight: 600;
  border-left: 2px solid #58a6ff;
  padding-left: 8px;
}
.doc-modal-toc a.toc-h1 {
  font-weight: 600;
  color: #c9d1d9;
  margin-top: 8px;
}
.doc-modal-toc a.toc-h2 {
  padding-left: 8px;
}
.doc-modal-toc a.toc-h3 { padding-left: 16px; color: #8b949e; }
.doc-modal-toc a.toc-h4 { padding-left: 24px; font-size: 0.75rem; color: #6e7681; }

.doc-modal-layout > .doc-content {
  overflow-y: auto;
  padding: 28px 32px 60px;
}

@media (max-width: 768px) {
  .doc-modal-container { width: 100vw; max-width: none; }
  .doc-modal-layout {
    grid-template-columns: 1fr;
    height: calc(100vh - 64px);
  }
  .doc-modal-toc {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    width: 260px;
    height: calc(100vh - 64px);
    background: var(--bg-surface);
    z-index: 10;
    border-right: 1px solid #21262d;
  }
  .doc-modal-toc.open { display: block; }
}

/* Scrollbar */
.arch-modal-body::-webkit-scrollbar { width: 6px; }
.arch-modal-body::-webkit-scrollbar-track { background: transparent; }
.arch-modal-body::-webkit-scrollbar-thumb { background: rgba(0, 240, 255, 0.12); border-radius: 3px; }
.arch-modal-body::-webkit-scrollbar-thumb:hover { background: rgba(0, 240, 255, 0.25); }

/* Mobile */
@media (max-width: 768px) {
  .arch-modal-container {
    width: 100vw;
    max-height: 100vh;
    border-radius: 0;
    max-width: none;
  }
  .arch-modal-body { padding: 20px 16px; }
  .arch-modal-ports { gap: 6px; }
  .arch-port { padding: 6px 10px; }
  .arch-layer { padding: 12px 14px; }
}

/* ============================================
   WHAT IS IT MODAL — Card Grid
   ============================================ */
.modal-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.modal-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 20px;
  transition: border-color 0.2s;
}
.modal-card:hover {
  border-color: rgba(0, 240, 255, 0.25);
}
.modal-card-icon {
  font-size: 1.6rem;
  margin-bottom: 10px;
}
.modal-card h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}
.modal-card p {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin: 0;
}
@media (max-width: 768px) {
  .modal-card-grid { grid-template-columns: 1fr; }
}

/* ============================================
   DOCS MODAL — Navigation Sidebar
   ============================================ */
.docs-nav-sidebar {
  display: flex;
  flex-direction: column;
}
.docs-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 12px;
}
.docs-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  background: none;
  border: none;
  border-radius: 6px;
  color: #8b949e;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.docs-nav-item:hover {
  background: rgba(110, 118, 129, 0.1);
  color: #c9d1d9;
}
.docs-nav-item.active {
  background: rgba(0, 240, 255, 0.08);
  color: var(--accent-cyan);
  font-weight: 600;
  border-left: 2px solid var(--accent-cyan);
}
.docs-nav-icon {
  font-size: 1rem;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}
.docs-nav-divider {
  border: none;
  border-top: 1px solid #21262d;
  margin: 0 0 8px;
}
.docs-toc-section {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #30363d transparent;
}
.docs-toc-section::-webkit-scrollbar { width: 6px; }
.docs-toc-section::-webkit-scrollbar-track { background: transparent; }
.docs-toc-section::-webkit-scrollbar-thumb { background: #30363d; border-radius: 3px; }
.docs-toc-section a {
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 0.75rem;
  color: #8b949e;
  padding: 2px 0;
  line-height: 1.4;
  transition: color 0.15s;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  text-decoration: none;
}
.docs-toc-section a:hover { color: #58a6ff; opacity: 1; }
.docs-toc-section a.active {
  color: #f0f6fc;
  font-weight: 600;
}
.docs-toc-section a.toc-h1 {
  font-weight: 600;
  color: #c9d1d9;
  margin-top: 6px;
  font-size: 0.78rem;
}
.docs-toc-section a.toc-h2 { padding-left: 8px; }
.docs-toc-section a.toc-h3 { padding-left: 16px; font-size: 0.72rem; }

/* ============================================
   COMMUNITY MODAL — Card Grid
   ============================================ */
.community-modal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.community-modal-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 20px;
  transition: transform 0.2s, border-color 0.2s;
  text-decoration: none;
}
.community-modal-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 240, 255, 0.25);
  opacity: 1;
}
.community-modal-icon {
  color: var(--accent-cyan);
  margin-bottom: 16px;
}
.community-modal-card h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}
.community-modal-card p {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin: 0 0 12px;
}
.community-modal-card .card-link {
  margin-top: auto;
}
@media (max-width: 768px) {
  .community-modal-grid { grid-template-columns: 1fr; }
}

/* ============================================
   SCANLINE OVERLAY (subtle)
   ============================================ */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  z-index: 9999;
}