/* ── Variables ─────────────────────────────────────────────── */
#gdsl-container {
  --gdsl-bg:          #0d0f14;
  --gdsl-surface:     #13161e;
  --gdsl-surface2:    #1a1e28;
  --gdsl-border:      #252a38;
  --gdsl-accent:      #4af0c4;
  --gdsl-accent2:     #f0a84a;
  --gdsl-accent3:     #a84af0;
  --gdsl-accent4:     #f04a6e;
  --gdsl-text:        #c8d0e0;
  --gdsl-text-dim:    #6b7490;
  --gdsl-text-bright: #eef2ff;
  --gdsl-mono:        'IBM Plex Mono', monospace;
  --gdsl-sans:        'IBM Plex Sans', sans-serif;
}

/* ── Reset (scoped) ────────────────────────────────────────── */
#gdsl-container * {
  box-sizing: border-box;
  /* margin: 0;
  padding: 0; */
}

/* ── Container & shell ─────────────────────────────────────── */
#gdsl-container {
  position: relative !important; /* for guide section anchors */
  display: flex;
  background: var(--gdsl-bg);
  color: var(--gdsl-text);
  font-family: var(--gdsl-sans);
  font-size: 15px;
  line-height: 1.7;
  /*
  align-content: center;
  */
  justify-content: center;
}
.gdsl-shell {
  display: flex;
  min-height: 100vh;
  align-content: center;
}

/* ── Sidebar ───────────────────────────────────────────────── */
.gdsl-sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--gdsl-surface);
  border-right: 1px solid var(--gdsl-border);
  padding: 24px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  flex-shrink: 0;
}
.gdsl-sidebar-header {
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--gdsl-border);
  margin-bottom: 16px;
}
.gdsl-sidebar-label {
  font-family: var(--gdsl-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--gdsl-text-dim);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.gdsl-sidebar-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--gdsl-accent);
  font-family: var(--gdsl-mono);
}

/* ── Nav items ─────────────────────────────────────────────── */
.gdsl-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  cursor: pointer;
  transition: all 0.15s;
  border-left: 2px solid transparent;
  font-size: 13px;
  color: var(--gdsl-text-dim);
}
.gdsl-nav-item:hover {
  background: var(--gdsl-surface2);
  color: var(--gdsl-text);
  border-left-color: var(--gdsl-border);
}
.gdsl-nav-item--active {
  background: var(--gdsl-surface2);
  color: var(--gdsl-accent);
  border-left-color: var(--gdsl-accent);
}
.gdsl-nav-num {
  font-family: var(--gdsl-mono);
  font-size: 11px;
  color: var(--gdsl-text-dim);
  min-width: 28px;
}
.gdsl-nav-item--active .gdsl-nav-num {
  color: var(--gdsl-accent);
}

/* ── Main content area ─────────────────────────────────────── */
.gdsl-main {
  flex: 1;
  padding: 48px 56px;
  max-width: 900px;
}

/* ── Section panels ────────────────────────────────────────── */
.gdsl-section {
  display: none;
}
.gdsl-section--active {
  display: block;
  animation: gdslFadeIn 0.2s ease;
}
@keyframes gdslFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.gdsl-section-tag {
  font-family: var(--gdsl-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gdsl-text-dim);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.gdsl-section-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--gdsl-text-bright);
  line-height: 1.25;
  margin-bottom: 6px;
}
.gdsl-section-subtitle {
  font-family: var(--gdsl-mono);
  font-size: 13px;
  color: var(--gdsl-accent);
  margin-bottom: 32px;
}

/* ── Typography ────────────────────────────────────────────── */
#gdsl-container p {
  margin-bottom: 14px;
  color: var(--gdsl-text);
}
#gdsl-container p:last-child { margin-bottom: 0; }
#gdsl-container strong { color: var(--gdsl-text-bright); font-weight: 600; }
#gdsl-container em {
  color: var(--gdsl-accent2);
  font-style: normal;
  font-family: var(--gdsl-mono);
  font-size: 0.92em;
}
#gdsl-container code {
  font-family: var(--gdsl-mono);
  font-size: 12.5px;
  background: var(--gdsl-surface2);
  color: var(--gdsl-accent);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--gdsl-border);
}
#gdsl-container hr {
  border: none;
  border-top: 1px solid var(--gdsl-border);
  margin: 28px 0;
}

/* ── Lead paragraph ────────────────────────────────────────── */
.gdsl-lead {
  font-size: 16px;
  color: var(--gdsl-text);
  margin-bottom: 28px;
  border-left: 3px solid var(--gdsl-accent);
  padding-left: 16px;
  line-height: 1.75;
}

/* ── Named block ───────────────────────────────────────────── */
.gdsl-block {
  margin-bottom: 28px;
}
.gdsl-block-title {
  font-family: var(--gdsl-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gdsl-accent2);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.gdsl-block-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gdsl-border);
}

/* ── Diagram ───────────────────────────────────────────────── */
.gdsl-diagram {
  background: var(--gdsl-surface2);
  border: 1px solid var(--gdsl-border);
  border-radius: 6px;
  padding: 20px 24px;
  font-family: var(--gdsl-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--gdsl-text);
  margin-bottom: 24px;
  overflow-x: auto;
  white-space: pre;
}

/* ── Callouts ──────────────────────────────────────────────── */
.gdsl-callout {
  border-radius: 6px;
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 14px;
  border-left: 3px solid;
}
.gdsl-callout--info   { background: rgba(74,240,196,0.06);  border-color: var(--gdsl-accent);  }
.gdsl-callout--warn   { background: rgba(240,168,74,0.06);  border-color: var(--gdsl-accent2); }
.gdsl-callout--danger { background: rgba(240,74,110,0.06);  border-color: var(--gdsl-accent4); }
.gdsl-callout--purple { background: rgba(168,74,240,0.06);  border-color: var(--gdsl-accent3); }
.gdsl-callout-label {
  font-family: var(--gdsl-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-weight: 600;
}
.gdsl-callout--info   .gdsl-callout-label { color: var(--gdsl-accent);  }
.gdsl-callout--warn   .gdsl-callout-label { color: var(--gdsl-accent2); }
.gdsl-callout--danger .gdsl-callout-label { color: var(--gdsl-accent4); }
.gdsl-callout--purple .gdsl-callout-label { color: var(--gdsl-accent3); }

/* ── Grid ──────────────────────────────────────────────────── */
.gdsl-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.gdsl-grid-cell {
  background: var(--gdsl-surface2);
  border: 1px solid var(--gdsl-border);
  border-radius: 6px;
  padding: 16px;
}
.gdsl-grid-cell-title {
  font-family: var(--gdsl-mono);
  font-size: 11px;
  color: var(--gdsl-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.gdsl-grid-cell p { font-size: 13.5px; }

/* ── Bullet list ───────────────────────────────────────────── */
.gdsl-list {
  list-style: none;
  margin-bottom: 16px;
}
.gdsl-list li {
  padding: 5px 0 5px 20px;
  position: relative;
  font-size: 14px;
  color: var(--gdsl-text);
}
.gdsl-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--gdsl-accent);
  font-family: var(--gdsl-mono);
  font-size: 12px;
}

/* ── State machine ─────────────────────────────────────────── */
.gdsl-states {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.gdsl-state-box {
  background: var(--gdsl-surface2);
  border: 1px solid var(--gdsl-border);
  border-radius: 6px;
  padding: 10px 16px;
  font-family: var(--gdsl-mono);
  font-size: 12px;
  text-align: center;
  min-width: 90px;
}
.gdsl-state-box--accent { border-color: var(--gdsl-accent);  }
.gdsl-state-box--warn   { border-color: var(--gdsl-accent2); }
.gdsl-state-name {
  color: var(--gdsl-text-bright);
  font-weight: 600;
  font-size: 13px;
}
.gdsl-state-desc {
  color: var(--gdsl-text-dim);
  font-size: 10px;
  margin-top: 2px;
}
.gdsl-arrow {
  font-family: var(--gdsl-mono);
  font-size: 11px;
  color: var(--gdsl-text-dim);
  padding: 0 6px;
  text-align: center;
  white-space: nowrap;
}
.gdsl-arrow span {
  display: block;
  font-size: 16px;
  line-height: 1;
}

/* ── Table ─────────────────────────────────────────────────── */
.gdsl-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 13.5px;
}
.gdsl-table th {
  font-family: var(--gdsl-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gdsl-accent);
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--gdsl-border);
  background: var(--gdsl-surface2);
}
.gdsl-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--gdsl-border);
  color: var(--gdsl-text);
  vertical-align: top;
}
.gdsl-table tr:last-child td { border-bottom: none; }
.gdsl-table tr:hover td      { background: var(--gdsl-surface2); }

/* ── Progress bar ──────────────────────────────────────────── */
.gdsl-progress-bar {
  height: 2px;
  background: var(--gdsl-border);
  border-radius: 2px;
  margin-bottom: 40px;
  overflow: hidden;
}
.gdsl-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gdsl-accent), var(--gdsl-accent3));
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* ── Nav buttons ───────────────────────────────────────────── */
.gdsl-nav-buttons {
  display: flex;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--gdsl-border);
}
.gdsl-btn {
  font-family: var(--gdsl-mono);
  font-size: 12px;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid var(--gdsl-border);
  background: var(--gdsl-surface2);
  color: var(--gdsl-text);
  transition: all 0.15s;
  letter-spacing: 0.05em;
}
.gdsl-btn:hover          { border-color: var(--gdsl-accent); color: var(--gdsl-accent); }
.gdsl-btn--primary       { background: var(--gdsl-accent); color: var(--gdsl-bg); border-color: var(--gdsl-accent); font-weight: 600; }
.gdsl-btn--primary:hover { opacity: 0.85; }
.gdsl-btn:disabled       { opacity: 0.3; cursor: not-allowed; }

/* ── Scrollbar (sidebar) ───────────────────────────────────── */
.gdsl-sidebar::-webkit-scrollbar        { width: 6px; }
.gdsl-sidebar::-webkit-scrollbar-track  { background: var(--gdsl-bg); }
.gdsl-sidebar::-webkit-scrollbar-thumb  { background: var(--gdsl-border); border-radius: 3px; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .gdsl-sidebar   { display: none; }
  .gdsl-main      { padding: 24px 20px; }
  .gdsl-grid      { grid-template-columns: 1fr; }
  .gdsl-states    { flex-direction: column; align-items: flex-start; }
}