/* ============================================================
   Compute Shader Notes — style.css
   Theme: ShaderToy-inspired dark terminal aesthetic
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  /* Core palette */
  --bg-deep:    #0a0c10;
  --bg-base:    #0f1117;
  --bg-card:    #151820;
  --bg-card2:   #1a1e28;
  --bg-hover:   #1f2432;
  --border:     #252a38;
  --border-hi:  #2e3448;

  /* Accent colors */
  --c-cyan:     #00e5ff;
  --c-green:    #39ff6e;
  --c-orange:   #ff8c42;
  --c-purple:   #b47aff;
  --c-pink:     #ff4d9a;
  --c-yellow:   #ffd54f;

  /* Text */
  --c-text:     #c8d0e0;
  --c-text-dim: #7a8499;
  --c-muted:    #4a5568;
  --c-head:     #e8edf8;

  /* Semantic */
  --c-good:     #39ff6e;
  --c-warn:     #ffd54f;
  --c-bad:      #ff4d6a;

  /* Layout */
  --sidebar-w:  240px;
  --content-max: 960px;
  --radius:     8px;
  --radius-lg:  14px;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;
  --font-body:  'Space Grotesk', system-ui, sans-serif;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 15px; }

body {
  background: var(--bg-deep);
  color: var(--c-text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Subtle scanline texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,229,255,0.012) 2px,
    rgba(0,229,255,0.012) 4px
  );
  pointer-events: none;
  z-index: 0;
}

a { color: var(--c-cyan); text-decoration: none; }
a:hover { text-decoration: underline; opacity: 0.85; }

/* ---------- Header ---------- */
.site-header {
  background: linear-gradient(135deg, #080c14 0%, #0d1528 50%, #080c14 100%);
  border-bottom: 1px solid var(--border-hi);
  padding: 52px 40px 44px;
  position: relative;
  overflow: hidden;
  z-index: 1;
  margin-left: calc(var(--sidebar-w) + 20px);
}

@media (max-width: 900px) {
  .site-header {
    margin-left: 20px;
  }
}

/* Animated grid background */
.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  animation: gridMove 20s linear infinite;
  pointer-events: none;
}

@keyframes gridMove {
  from { background-position: 0 0; }
  to   { background-position: 48px 48px; }
}

/* Glowing orb */
.site-header::after {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(0,229,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.header-inner { position: relative; z-index: 1; max-width: calc(var(--sidebar-w) + var(--content-max) + 80px); }

.header-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-cyan);
  border: 1px solid rgba(0,229,255,0.35);
  border-radius: 4px;
  padding: 3px 10px;
  margin-bottom: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: rgba(0,229,255,0.06);
}

.site-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 600;
  color: var(--c-head);
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(90deg, #ffffff 0%, var(--c-cyan) 60%, var(--c-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-subtitle {
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--c-text-dim);
  letter-spacing: 0.04em;
}

.header-tags {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-hi);
  color: var(--c-text-dim);
  letter-spacing: 0.06em;
}

/* ---------- Layout ---------- */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-base);
  border-right: 1px solid var(--border);
  padding: 28px 0 40px;
  overflow-y: auto;
  z-index: 100;
  /* Push down to not overlap header on narrow screens */
  margin-top: 0;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 2px; }

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
  padding: 0 22px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.nav-list { list-style: none; }

.nav-link {
  display: block;
  padding: 9px 22px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-text-dim);
  transition: color 0.2s, background 0.2s, border-left-color 0.2s;
  border-left: 2px solid transparent;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--c-cyan);
  background: rgba(0,229,255,0.06);
  border-left-color: var(--c-cyan);
  text-decoration: none;
}

.content {
  margin-left: var(--sidebar-w);
  padding: 0 40px 80px;
  max-width: calc(var(--sidebar-w) + var(--content-max) + 80px);
  position: relative;
  z-index: 1;
}

/* ---------- Chapter Sections ---------- */
.chapter {
  padding-top: 60px;
  margin-bottom: 20px;
}

.chapter-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-cyan);
  opacity: 0.7;
  letter-spacing: 0.1em;
  background: rgba(0,229,255,0.08);
  border: 1px solid rgba(0,229,255,0.2);
  border-radius: 4px;
  padding: 3px 9px;
  flex-shrink: 0;
}

.chapter-header h2 {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--c-head);
  letter-spacing: -0.01em;
}

/* ---------- Cards ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-purple), transparent);
  opacity: 0.4;
}

.card:hover { border-color: var(--border-hi); }

.card-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-cyan);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.card p {
  font-size: 0.9rem;
  color: var(--c-text);
  margin-bottom: 14px;
  line-height: 1.75;
}

.card p:last-child { margin-bottom: 0; }

/* ---------- Info Grids ---------- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.info-item {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.info-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}

.info-text {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  line-height: 1.5;
}

.info-text strong { color: var(--c-text); display: block; margin-bottom: 3px; }

/* ---------- Use Case Grid ---------- */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.use-case {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 0.82rem;
  color: var(--c-text-dim);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: border-color 0.2s, color 0.2s;
}

.use-case:hover { border-color: var(--c-cyan); color: var(--c-text); }
.uc-icon { font-size: 1.1rem; }

/* ---------- Hierarchy Visualization ---------- */
.hierarchy-viz {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.hier-level {
  width: 100%;
  max-width: 560px;
  border-radius: var(--radius);
  padding: 16px 22px;
  text-align: center;
  border: 1px solid;
}

.dispatch-level {
  background: rgba(0,229,255,0.07);
  border-color: rgba(0,229,255,0.35);
}

.group-level {
  background: rgba(180,122,255,0.07);
  border-color: rgba(180,122,255,0.35);
}

.thread-level {
  background: rgba(57,255,110,0.07);
  border-color: rgba(57,255,110,0.35);
}

.hier-label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-head);
  margin-bottom: 4px;
}

.hier-sublabel {
  font-size: 0.78rem;
  color: var(--c-text-dim);
  line-height: 1.5;
}

.hier-sublabel code {
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--c-yellow);
}

.hier-arrow {
  font-size: 1.4rem;
  color: var(--c-muted);
  line-height: 1.2;
  padding: 2px 0;
}

/* ---------- Formula Box ---------- */
.formula-box {
  background: rgba(0,229,255,0.04);
  border: 1px solid rgba(0,229,255,0.18);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  overflow-x: auto;
}

.formula-box p { margin-bottom: 6px; font-size: 0.82rem; color: var(--c-text-dim); }

/* ---------- Tips Grid ---------- */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 8px;
}

.tip-card {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--c-text-dim);
}

.tip-card.perf { border-left: 3px solid var(--c-green); }

.tip-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 8px;
}

.tip-card code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-yellow);
  background: rgba(255,213,79,0.08);
  border-radius: 4px;
  padding: 5px 8px;
  margin: 8px 0;
}

/* ---------- Tables ---------- */
.compare-table-wrap {
  overflow-x: auto;
  margin-top: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.compare-table thead {
  background: var(--bg-card2);
}

.compare-table th {
  padding: 11px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-cyan);
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-hi);
  white-space: nowrap;
}

.compare-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--c-text-dim);
  line-height: 1.5;
  vertical-align: top;
}

.compare-table tr:last-child td { border-bottom: none; }

.compare-table tr:hover td {
  background: var(--bg-hover);
  color: var(--c-text);
}

.compare-table td code,
.compare-table th code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--c-yellow);
  white-space: nowrap;
}

/* Platform table status cells */
.good { color: var(--c-good) !important; font-weight: 500; }
.warn { color: var(--c-warn) !important; font-weight: 500; }
.bad  { color: var(--c-bad)  !important; font-weight: 500; }

/* SV table */
.sv-table td:last-child { font-family: var(--font-mono); font-size: 0.8em; color: var(--c-purple); }

/* ---------- Code Blocks ---------- */
.code-block-wrap {
  margin-top: 14px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-hi);
}

.code-label {
  background: var(--bg-card2);
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-text-dim);
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-label::before {
  content: '';
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  opacity: 0.6;
  flex-shrink: 0;
}

pre {
  margin: 0;
  overflow-x: auto;
}

pre code {
  font-family: var(--font-mono) !important;
  font-size: 0.8rem !important;
  line-height: 1.65 !important;
  tab-size: 4;
  padding: 18px !important;
  display: block;
}

/* Override hljs background to match theme */
.hljs {
  background: #0c0f18 !important;
}

/* ---------- Info / Warning Boxes ---------- */
.info-box,
.warning-box {
  display: flex;
  gap: 14px;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-top: 14px;
  font-size: 0.84rem;
  line-height: 1.65;
  align-items: flex-start;
}

.info-box {
  background: rgba(0,229,255,0.05);
  border: 1px solid rgba(0,229,255,0.2);
  color: var(--c-text-dim);
}

.warning-box {
  background: rgba(255,213,79,0.05);
  border: 1px solid rgba(255,213,79,0.25);
  color: var(--c-text-dim);
}

.warn-icon, .info-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  line-height: 1.4;
}

.info-box strong,
.warning-box strong {
  color: var(--c-text);
}

.warning-box ul, .info-box ul {
  padding-left: 18px;
  margin-top: 4px;
}

/* ---------- Tabs ---------- */
.tab-container {
  margin-bottom: 18px;
}

.tab-bar {
  display: flex;
  gap: 2px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 6px 6px 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-bar::-webkit-scrollbar { display: none; }

.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--c-text-dim);
  cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
  letter-spacing: 0.03em;
  border-bottom: 2px solid transparent;
}

.tab-btn:hover {
  background: var(--bg-hover);
  color: var(--c-text);
}

.tab-btn.active {
  background: var(--bg-card2);
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.tab-panel {
  display: none;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  overflow: hidden;
}

.tab-panel.active { display: block; }

.tab-panel .card {
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.tab-panel .card::before { opacity: 0; }
.tab-panel .card:last-child { border-bottom: none; }

/* ---------- Flow Diagrams ---------- */
.flow-diagram {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 14px 0;
  padding: 14px;
  background: var(--bg-deep);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.flow-node {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 6px 12px;
  border-radius: var(--radius);
  background: var(--bg-card2);
  border: 1px solid var(--border-hi);
  color: var(--c-text-dim);
  white-space: nowrap;
}

.flow-node.cpu    { border-color: rgba(0,229,255,0.4);  color: var(--c-cyan); }
.flow-node.gpu    { border-color: rgba(57,255,110,0.4); color: var(--c-green); }
.flow-node.render { border-color: rgba(180,122,255,0.4);color: var(--c-purple); }

.flow-arrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-muted);
  white-space: nowrap;
}

/* ---------- Resource Cards ---------- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.resource-card {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: border-color 0.2s;
}

.resource-card:hover { border-color: var(--border-hi); }

.resource-card.rw     { border-left: 3px solid var(--c-cyan); }
.resource-card.ro     { border-left: 3px solid var(--c-green); }
.resource-card.special{ border-left: 3px solid var(--c-orange); }
.resource-card.shared { border-left: 3px solid var(--c-purple); }

.res-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  padding: 2px 7px;
  border-radius: 3px;
  margin-bottom: 8px;
  font-weight: 600;
}

.rw .res-badge     { background: rgba(0,229,255,0.12);  color: var(--c-cyan); }
.ro .res-badge     { background: rgba(57,255,110,0.1);  color: var(--c-green); }
.special .res-badge{ background: rgba(255,140,66,0.1);  color: var(--c-orange); }
.shared .res-badge { background: rgba(180,122,255,0.1); color: var(--c-purple); }

.res-name {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-head);
  margin-bottom: 8px;
}

.res-desc {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  line-height: 1.6;
}

.res-desc code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(255,255,255,0.07);
  border-radius: 3px;
  padding: 1px 4px;
  color: var(--c-yellow);
}

/* ---------- Traffic Patterns ---------- */
.traffic-list { display: flex; flex-direction: column; gap: 16px; margin-top: 8px; }

.traffic-item {
  display: flex;
  gap: 16px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: border-color 0.2s;
}

.traffic-item:hover { border-color: var(--border-hi); }

.traffic-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-orange);
  background: rgba(255,140,66,0.1);
  border: 1px solid rgba(255,140,66,0.25);
  border-radius: 6px;
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 2px;
}

.traffic-content { flex: 1; min-width: 0; }

.traffic-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-head);
  margin-bottom: 10px;
}

.traffic-flow {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.tf-node {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  color: var(--c-text-dim);
  white-space: nowrap;
}

.tf-node.gpu    { color: var(--c-green);  border-color: rgba(57,255,110,0.3); }
.tf-node.render { color: var(--c-purple); border-color: rgba(180,122,255,0.3); }

.tf-arrow { color: var(--c-muted); font-size: 0.75rem; }

.traffic-content p {
  font-size: 0.81rem;
  color: var(--c-text-dim);
  margin: 0;
  line-height: 1.65;
}

/* ---------- Reference Cards ---------- */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.ref-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}

.ref-card:hover {
  border-color: var(--c-cyan);
  background: rgba(0,229,255,0.04);
  text-decoration: none;
}

.ref-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}

.ref-title {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 3px;
}

.ref-sub {
  font-size: 0.74rem;
  color: var(--c-text-dim);
}

/* ---------- Floating Controls ---------- */
.floating-controls {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 200;
}

.float-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--bg-card2);
  border: 1px solid var(--border-hi);
  color: var(--c-text-dim);
  font-size: 1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
  font-family: var(--font-body);
}

.float-btn:hover {
  background: var(--bg-hover);
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  text-decoration: none;
  transform: translateY(-2px);
}

.top-btn {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.2s, background 0.2s, border-color 0.2s, color 0.2s;
}

.top-btn.show {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- Inline Code ---------- */
code {
  font-family: var(--font-mono);
  font-size: 0.83em;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  padding: 2px 5px;
  color: var(--c-yellow);
}

pre code {
  background: transparent !important;
  padding: 0 !important;
  border-radius: 0 !important;
  /* font-size: inherit !important; */
  color: inherit !important;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-muted); }

/* ---------- API Table ---------- */
.api-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-cyan);
  white-space: nowrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .sidebar {
    position: sticky;
    top: 0; bottom: 0; left: 0; right: 0;
    width: 100%;
    height: auto;
    border-right: none;
    border-top: 1px solid var(--border);
    padding: 8px 0 env(safe-area-inset-bottom, 0);
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }

  .sidebar-title { display: none; }

  .nav-list {
    display: flex;
    flex-direction: row;
    padding: 0 12px;
    gap: 0;
  }

  .nav-link {
    padding: 8px 14px;
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }

  .nav-link.active,
  .nav-link:hover {
    border-left-color: transparent;
    border-bottom-color: var(--c-cyan);
  }

  .content {
    margin-left: 0;
    padding: 0 18px 100px;
  }

  .site-header { padding: 36px 20px 30px; }

  .info-grid,
  .use-case-grid,
  .tips-grid,
  .resource-grid,
  .ref-grid { grid-template-columns: 1fr; }

  .platform-table { font-size: 0.74rem; }
}

@media (max-width: 500px) {
  .tab-btn { padding: 6px 10px; font-size: 0.7rem; }
  .hierarchy-viz .hier-level { padding: 12px; }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chapter { animation: fadeInUp 0.4s ease both; }
.chapter:nth-child(1) { animation-delay: 0.05s; }
.chapter:nth-child(2) { animation-delay: 0.1s; }
.chapter:nth-child(3) { animation-delay: 0.15s; }

/* ---------- MathJax overrides ---------- */
mjx-container {
  font-size: 1em !important;
  overflow-x: auto;
}

/* ============================================================
   Section 10 — Live Playground Integration
   ============================================================ */

/* Nav link highlight for playground */
.nav-link-playground {
  color: var(--c-cyan) !important;
  font-weight: 500;
}
.nav-link-playground::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
  margin-right: 7px;
  animation: blink-dot 1.4s ease-in-out infinite;
  vertical-align: middle;
  margin-bottom: 1px;
}
@keyframes blink-dot {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.25; }
}

/* ── Open-in-Playground buttons on code labels ── */
.open-in-playground {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 2px 9px;
  border-radius: 4px;
  border: 1px solid rgba(0,229,255,0.35);
  background: rgba(0,229,255,0.07);
  color: var(--c-cyan);
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: all .18s;
  white-space: nowrap;
  flex-shrink: 0;
  margin-left: auto;
}
.open-in-playground:hover {
  background: rgba(0,229,255,0.18);
  border-color: var(--c-cyan);
  box-shadow: 0 0 10px rgba(0,229,255,0.2);
  transform: translateY(-1px);
}
.open-in-playground:active {
  transform: translateY(0);
}
/* Pulse when recently clicked */
.open-in-playground.clicked {
  background: var(--c-cyan);
  color: #040c14;
  animation: pg-flash 0.4s ease forwards;
}
@keyframes pg-flash {
  0%   { box-shadow: 0 0 0 0 rgba(0,229,255,0.8); }
  100% { box-shadow: 0 0 20px 6px rgba(0,229,255,0); }
}

/* ── Intro card extras ── */
.inline-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.78em;
  background: rgba(0,229,255,0.1);
  border: 1px solid rgba(0,229,255,0.25);
  border-radius: 4px;
  padding: 1px 8px;
  color: var(--c-cyan);
  white-space: nowrap;
}

.playground-feature-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.pf-item {
  font-size: 0.78rem;
  color: var(--c-text-dim);
  display: flex;
  align-items: center;
  gap: 5px;
}
.pf-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-card2);
  border: 1px solid var(--border-hi);
  border-radius: 3px;
  padding: 1px 6px;
  color: var(--c-yellow);
}

.playground-presets-hint {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.hint-label {
  font-size: 0.75rem;
  color: var(--c-text-dim);
  margin-right: 4px;
}
.preset-inject-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border-hi);
  background: var(--bg-card2);
  color: var(--c-text-dim);
  cursor: pointer;
  transition: all .18s;
  letter-spacing: 0.03em;
}
.preset-inject-btn:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: rgba(0,229,255,0.07);
}
.preset-inject-btn.active {
  background: var(--c-cyan);
  color: #040c14;
  border-color: var(--c-cyan);
  font-weight: 600;
}

/* ── Inject preview bar ── */
.inject-preview {
  background: var(--bg-card);
  border: 1px solid rgba(0,229,255,0.3);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  animation: slideDown 0.25s ease;
}
@keyframes slideDown {
  from { opacity:0; transform: translateY(-8px); }
  to   { opacity:1; transform: translateY(0); }
}

.inject-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(0,229,255,0.06);
  border-bottom: 1px solid var(--border);
}
.inject-label {
  font-size: 0.75rem;
  color: var(--c-text-dim);
}
.inject-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-cyan);
  font-weight: 600;
}
.inject-cancel {
  margin-left: auto;
  background: none;
  border: 1px solid rgba(255,77,154,0.3);
  border-radius: 4px;
  color: var(--c-pink);
  font-size: 0.7rem;
  padding: 2px 8px;
  cursor: pointer;
  font-family: var(--font-mono);
  transition: all .18s;
}
.inject-cancel:hover {
  background: rgba(255,77,154,0.1);
}

.inject-code-preview {
  max-height: 140px;
  overflow: auto;
  margin: 0;
  padding: 12px 16px;
  background: #08090f;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--c-text-dim);
  line-height: 1.6;
  border-bottom: 1px solid var(--border);
}
.inject-code-preview code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.btn-inject-confirm {
  display: block;
  width: 100%;
  padding: 10px;
  background: rgba(0,229,255,0.1);
  border: none;
  border-top: 1px solid rgba(0,229,255,0.2);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: background .2s;
}
.btn-inject-confirm:hover {
  background: rgba(0,229,255,0.18);
}

/* ── Playground iframe wrapper ── */
.playground-frame-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-hi);
  background: #000;
  position: relative;
  box-shadow: 0 0 60px rgba(0,229,255,0.04), 0 24px 48px rgba(0,0,0,0.5);
}

.playground-frame-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  height: 34px;
  background: #0a0c14;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pfh-dots {
  display: flex;
  gap: 5px;
  align-items: center;
}
.pfh-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--border-hi);
}
.pfh-dots span:nth-child(1) { background: #ff5f57; }
.pfh-dots span:nth-child(2) { background: #febc2e; }
.pfh-dots span:nth-child(3) { background: #28c840; }

.pfh-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-text-dim);
  letter-spacing: 0.05em;
}

.pfh-actions {
  margin-left: auto;
  display: flex;
  gap: 4px;
}
.pfh-btn {
  width: 26px; height: 26px;
  border-radius: 5px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  color: var(--c-text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .18s;
  text-decoration: none;
}
.pfh-btn:hover {
  color: var(--c-cyan);
  border-color: rgba(0,229,255,0.35);
  background: rgba(0,229,255,0.07);
  text-decoration: none;
}

.playground-iframe {
  display: block;
  width: 100%;
  height: 680px;
  border: none;
  background: #060810;
}

/* Fullscreen state */
.playground-frame-wrap.is-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 500;
  border-radius: 0;
  border: none;
}
.playground-frame-wrap.is-fullscreen .playground-iframe {
  height: calc(100vh - 34px);
}

/* Loading overlay */
.iframe-loading {
  position: absolute;
  inset: 34px 0 0 0;
  background: #060810;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-text-dim);
  transition: opacity 0.4s;
}
.iframe-loading.hidden {
  opacity: 0;
  pointer-events: none;
}
.iframe-spinner {
  width: 28px; height: 28px;
  border: 2px solid rgba(0,229,255,0.15);
  border-top-color: var(--c-cyan);
  border-radius: 50%;
  animation: spin-iframe 0.8s linear infinite;
}
@keyframes spin-iframe {
  to { transform: rotate(360deg); }
}

/* Playground intro card accent */
.playground-intro-card::before {
  background: linear-gradient(90deg, var(--c-green), var(--c-cyan), var(--c-orange)) !important;
  opacity: 0.6 !important;
}