/* DefiSkills — Nethermind-inspired dark theme */
:root {
  --bg-primary: #09090b;
  --bg-secondary: #111113;
  --bg-tertiary: #1a1a1e;
  --border: #27272a;
  --border-light: #1e1e22;
  --text-primary: #d4d4d8;
  --text-secondary: #a1a1aa;
  --text-muted: #85858f;
  --text-white: #fafafa;
  --accent: #d48b1f;
  --accent-hover: #e89e2f;
  --accent-dim: #1a1408;
  --cyan: #02aceb;
  --cyan-hover: #2ebdf5;
  --cyan-dim: #081a24;
  --green: #22c55e;
  --green-dim: #0a1f12;
  --orange: #d48b1f;
  --orange-dim: #1a1408;
  --red: #ef4444;
  --red-dim: #2a0f0f;
  --purple: #a855f7;
  --purple-dim: #1b0f2e;
  --mono: 'DM Mono', 'SFMono-Regular', Consolas, monospace;
  --sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --display: 'Exo', 'DM Sans', sans-serif;
  --radius: 6px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  border-radius: 0 0 var(--radius) var(--radius);
  text-decoration: none;
}
.skip-to-content:focus {
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  text-decoration: none;
}
body {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan); text-decoration: none; transition: color 0.15s; }
a:hover { text-decoration: underline; color: var(--cyan-hover); }
code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ================================================================
   NAV
   ================================================================ */
.site-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
  background: linear-gradient(90deg, var(--accent-hover), var(--cyan-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}
.nav-logo:hover { text-decoration: none; -webkit-text-fill-color: transparent; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 7px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
  transition: color 0.15s, border-color 0.15s;
}
.nav-toggle:hover {
  color: var(--text-white);
  border-color: var(--text-muted);
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-links a {
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.1s, background 0.1s;
}
.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  text-decoration: none;
}
.nav-links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.nav-links a.active {
  color: var(--text-white);
  background: var(--bg-tertiary);
}

/* ================================================================
   LAYOUT
   ================================================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.page-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
.section {
  padding: 48px 0;
}
.section + .section {
  border-top: 1px solid var(--border);
}

/* ================================================================
   TYPOGRAPHY
   ================================================================ */
.page-title {
  font-family: var(--display);
  font-size: 24px;
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 4px;
}
.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}
h2.section-heading {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
h3.sub-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 24px 0 8px;
}
.body-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
}
.body-text strong { color: var(--text-primary); }

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-accent {
  background: var(--accent);
  border-color: rgba(212,139,31,0.2);
  color: #fff;
}
.btn-accent:hover { background: var(--accent-hover); }
.btn-outline {
  background: var(--bg-tertiary);
  border-color: var(--border);
  color: var(--text-primary);
}
.btn-outline:hover {
  background: var(--bg-secondary);
  border-color: var(--text-muted);
}

/* ================================================================
   CODE BLOCKS
   ================================================================ */
pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-primary);
  overflow-x: auto;
  margin-bottom: 16px;
}
pre .c { color: var(--text-muted); }
pre .s { color: var(--green); }
pre .k { color: var(--cyan); }
pre .n { color: var(--accent); }
pre .p { color: var(--purple); }

/* ================================================================
   TABLES
   ================================================================ */
.table-wrap { overflow-x: auto; margin-bottom: 16px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
thead th {
  text-align: left;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
tbody td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: top;
}
tbody tr:hover {
  background: var(--bg-tertiary);
}
td code {
  font-size: 12px;
  padding: 1px 4px;
}

/* ================================================================
   CARDS & BOXES
   ================================================================ */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.card-title {
  font-family: var(--display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 6px;
}
.card-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.info-box {
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 13px;
  margin-bottom: 16px;
  line-height: 1.5;
}
.info-box strong { font-weight: 600; }
.info-box-blue {
  background: var(--cyan-dim);
  border: 1px solid rgba(2,172,235,0.2);
  color: var(--text-primary);
}
.info-box-blue strong { color: var(--cyan); }
.info-box-orange {
  background: var(--orange-dim);
  border: 1px solid rgba(212,139,31,0.2);
  color: var(--text-primary);
}
.info-box-orange strong { color: var(--orange); }

/* ================================================================
   ENDPOINT BLOCKS (API docs)
   ================================================================ */
.endpoint {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}
.endpoint-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-tertiary);
}
.http-method {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 3px;
  text-transform: uppercase;
}
.http-get { background: var(--cyan-dim); color: var(--cyan); }
.http-post { background: var(--accent-dim); color: var(--accent); }
.http-delete { background: var(--red-dim); color: var(--red); }
.endpoint-path {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-white);
}
.endpoint-body {
  padding: 14px;
}
.endpoint-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

/* ================================================================
   TAGS / BADGES
   ================================================================ */
.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}
.tag-green { border-color: rgba(34,197,94,0.3); color: var(--green); background: var(--green-dim); }
.tag-blue { border-color: rgba(2,172,235,0.3); color: var(--cyan); background: var(--cyan-dim); }
.tag-purple { border-color: rgba(168,85,247,0.3); color: var(--purple); background: var(--purple-dim); }
.tag-orange { border-color: rgba(212,139,31,0.3); color: var(--orange); background: var(--orange-dim); }

/* ================================================================
   GRID LAYOUTS
   ================================================================ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

/* ================================================================
   ARCHITECTURE DIAGRAMS
   ================================================================ */
.diagram {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
  overflow-x: auto;
  white-space: pre;
  margin-bottom: 16px;
}

/* ================================================================
   PIPELINE VISUALIZATION
   ================================================================ */
.pipeline-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}
.pipeline-bar {
  background: var(--bg-tertiary);
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
}
.pipeline-bar-dot {
  width: 10px; height: 10px; border-radius: 50%;
}
.pipeline-bar-dot.red { background: var(--red); }
.pipeline-bar-dot.yellow { background: var(--accent); }
.pipeline-bar-dot.green { background: var(--green); }
.pipeline-bar-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-left: 8px;
  font-family: var(--mono);
}
.pipeline-content {
  padding: 20px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

/* ================================================================
   FOOTER
   ================================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}
.site-footer a.footer-muted {
  color: var(--text-muted);
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 768px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .page-title { font-size: 20px; }

  /* Mobile nav */
  .nav-toggle { display: block; }
  .nav-inner { flex-wrap: wrap; }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 8px 0 12px;
    border-top: 1px solid var(--border);
    margin-top: 8px;
  }
  .nav-links.open { display: flex; }
  .nav-inner { height: auto; min-height: 48px; padding-top: 10px; padding-bottom: 2px; }
  .nav-links a {
    padding: 12px;
    font-size: 14px;
    border-radius: 6px;
    width: 100%;
    min-height: 44px;
    display: flex;
    align-items: center;
  }
  .nav-links a:hover,
  .nav-links a.active {
    background: var(--bg-tertiary);
  }
}

/* ================================================================
   LISTS
   ================================================================ */
ul.body-list, ol.body-list {
  margin: 0 0 14px 20px;
  font-size: 13px;
  color: var(--text-secondary);
}
ul.body-list li, ol.body-list li {
  margin-bottom: 4px;
  line-height: 1.55;
}
ul.body-list li strong, ol.body-list li strong {
  color: var(--text-primary);
}