.gd { --section-y: clamp(40px, 6vw, 72px); }
.gd-vh {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.gd-hero {
  padding: 72px 0 24px;
  text-align: center;
  background:
    radial-gradient(60% 80% at 15% 0%, rgba(139, 92, 246, 0.10), transparent 70%),
    radial-gradient(50% 70% at 90% 10%, rgba(20, 184, 166, 0.08), transparent 70%);
}
.gd-hero + .section { padding-top: var(--space-10); }
.gd-hero-inner { max-width: 780px; margin-inline: auto; }
.gd-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.05;
  letter-spacing: var(--tracking-tight);
  color: var(--fg);
  margin: 14px 0 20px;
  text-wrap: balance;
}
.gd-hero .lede {
  font-size: var(--fs-body-lg);
  line-height: var(--lh-relaxed);
  color: var(--fg-body);
  margin: 0 auto;
  max-width: 660px;
}

.gd-meta { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.gd-tag {
  display: inline-flex; align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-violet-50);
  border: 1px solid var(--border-brand);
  color: var(--color-violet-700);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.gd-tag.ghost { background: transparent; border-color: var(--border-strong); color: var(--fg-muted); }
.gd-excerpt {
  display: block;
  color: var(--fg-body);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
}

.gd-featured-sec { padding-bottom: var(--space-8); }
.gd-featured {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  background: var(--bg-card);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.gd-featured:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.gd-featured:focus-visible { outline: none; box-shadow: var(--focus-ring), var(--shadow-lg); }
.gd-featured-art {
  display: block;
  width: 100%; height: 100%;
  min-height: 320px;
  object-fit: cover;
  object-position: center top;
  background: var(--color-ivory);
  border-right: 1px solid var(--border);
}
.gd-featured-body {
  display: flex; flex-direction: column; align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-10);
}
.gd-featured-title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--fg);
}
.gd-read {
  display: inline-flex; align-items: center; gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-4);
  font-weight: 600;
  color: var(--brand);
}
.gd-read i, .gd-read svg { width: 16px; height: 16px; transition: transform var(--dur-base) var(--ease-out); }
.gd-featured:hover .gd-read i, .gd-featured:hover .gd-read svg { transform: translateX(3px); }

.gd-search { margin-bottom: var(--space-5); max-width: 520px; }
.gd-search label { display: block; margin-bottom: var(--space-2); font-size: var(--fs-body-sm); font-weight: 600; color: var(--fg); }
.gd-search-field {
  display: flex; align-items: center; gap: var(--space-3);
  padding: 0 var(--space-4);
  min-height: 48px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  background: var(--bg-card);
}
.gd-search-field:focus-within { border-color: var(--color-violet-300); box-shadow: var(--focus-ring); }
.gd-search-field i, .gd-search-field svg { width: 18px; height: 18px; flex: none; color: var(--fg-muted); }
.gd-search-field input { flex: 1; min-width: 0; border: 0; background: none; padding: 0; font: inherit; font-size: var(--fs-body); color: var(--fg); }
.gd-search-field input:focus { outline: none; }

.gd-filters {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: var(--space-4) var(--space-8);
  margin-bottom: var(--space-4);
}
.gd-facet { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.gd-facet-label {
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg-muted);
}
.gd-chip {
  appearance: none;
  padding: 8px 14px;
  min-height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--fg-body);
  font: inherit;
  font-size: var(--fs-body-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.gd-chip:hover { border-color: var(--color-violet-300); color: var(--fg); }
.gd-chip:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.gd-chip.is-on { background: var(--brand); border-color: var(--brand); color: #fff; }
.gd-reset, .gd-linkbtn {
  appearance: none; border: 0; background: none; padding: 0;
  font: inherit; font-size: var(--fs-body-sm); font-weight: 600;
  color: var(--brand); cursor: pointer; text-decoration: underline;
}
.gd-reset { min-height: 44px; }
.gd-reset:focus-visible, .gd-linkbtn:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
.gd-count { margin: 0 0 var(--space-6); min-height: 1.4em; font-size: var(--fs-body-sm); color: var(--fg-muted); }

.gd-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.gd-library .gd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gd-cell { display: flex; }
.gd-cell[hidden] { display: none; }
.gd-card {
  display: flex; flex-direction: column;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.gd-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: var(--border-brand); }
.gd-card:focus-visible { outline: none; box-shadow: var(--focus-ring), var(--shadow-lg); }
.gd-card-art {
  display: block;
  width: 100%; height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: center top;
  background: var(--color-ivory);
  border-bottom: 1px solid var(--border);
}
.gd-card-body {
  display: flex; flex-direction: column; align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-6);
  flex: 1;
}
.gd-card-title { font-family: var(--font-display); font-size: var(--fs-h5); line-height: var(--lh-snug); color: var(--fg); }
.gd-card-foot {
  display: flex; align-items: center; gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-3);
  font-size: var(--fs-caption);
  color: var(--fg-muted);
}
.gd-card-foot span { display: inline-flex; align-items: center; gap: 6px; }
.gd-card-foot i, .gd-card-foot svg { width: 14px; height: 14px; }
.gd-featured .gd-card-foot { margin-top: 0; }
.gd-empty {
  margin: var(--space-8) 0 0;
  padding: var(--space-8);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-xl);
  text-align: center;
  color: var(--fg-body);
}
.gd-empty a { color: var(--brand); font-weight: 600; }
.gd-zero .btn { margin-top: var(--space-4); }

.gd-reslist {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}
.gd-reslist a {
  display: flex; flex-direction: column; gap: var(--space-2);
  height: 100%;
  padding: var(--space-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.gd-reslist a:hover { border-color: var(--color-violet-300); box-shadow: var(--shadow-md); }
.gd-reslist a:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.gd-reslist i, .gd-reslist svg { width: 20px; height: 20px; color: var(--brand); }
.gd-res-title { font-family: var(--font-display); font-size: var(--fs-h5); color: var(--fg); }
.gd-res-desc { font-size: var(--fs-body-sm); color: var(--fg-muted); line-height: var(--lh-relaxed); }

.gdd-wrap { width: min(100% - 48px, 1120px); margin-inline: auto; }
.gdd-head { padding: var(--space-12) 0 var(--space-10); border-bottom: 1px solid var(--border); }
.gdd-head .gdd-wrap > * { max-width: 780px; }
.gdd-crumb { margin-bottom: var(--space-6); }
.gdd-crumb ol {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  font-size: var(--fs-body-sm);
  color: var(--fg-muted);
}
.gdd-crumb li + li::before { content: "/"; margin-right: var(--space-2); color: var(--fg-faint); }
.gdd-crumb a { color: var(--fg-muted); text-decoration: none; }
.gdd-crumb a:hover { color: var(--brand); text-decoration: underline; }
.gdd-crumb a:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
.gdd-head h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.4vw, 50px);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--fg);
  margin: var(--space-4) 0;
  text-wrap: balance;
}
.gdd-head .lede { font-size: var(--fs-body-lg); line-height: var(--lh-relaxed); color: var(--fg-body); margin: 0 0 var(--space-6); }
.gdd-byline {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  margin: 0;
  font-size: var(--fs-body-sm);
  color: var(--fg-muted);
}
.gdd-byline span { display: inline-flex; align-items: center; gap: 6px; }
.gdd-byline i, .gdd-byline svg { width: 15px; height: 15px; }

.gdd-layout {
  width: min(100% - 48px, 1120px);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 240px minmax(0, 720px);
  justify-content: space-between;
  gap: var(--space-12);
  padding: var(--space-12) 0 var(--space-16);
}
.gdd-side { position: relative; }
.gdd-toc { position: sticky; top: 96px; }
.gdd-toc-h {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg-muted);
}
.gdd-toc ol, .gdd-toc-mobile ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.gdd-toc a, .gdd-toc-mobile a {
  display: block;
  padding: 8px 12px;
  border-left: 2px solid var(--border);
  font-size: var(--fs-body-sm);
  line-height: 1.4;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.gdd-toc a:hover, .gdd-toc-mobile a:hover { color: var(--fg); border-left-color: var(--color-violet-300); }
.gdd-toc a:focus-visible, .gdd-toc-mobile a:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
.gdd-toc a.is-current { color: var(--brand); font-weight: 600; border-left-color: var(--brand); }
.gdd-toc-mobile { display: none; }

.gdd-takeaways {
  margin: 0 0 var(--space-12);
  padding: var(--space-8);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-2xl);
  background: var(--gradient-ai-soft);
}
.gdd-takeaways h2 { font-family: var(--font-display); font-size: var(--fs-h5); margin: 0 0 var(--space-4); color: var(--fg); }
.gdd-takeaways ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
.gdd-takeaways li { display: flex; align-items: flex-start; gap: var(--space-3); color: var(--fg-body); line-height: var(--lh-relaxed); }
.gdd-takeaways i, .gdd-takeaways svg { width: 18px; height: 18px; flex: none; margin-top: 4px; color: var(--brand); }

.gdd-section { margin-bottom: var(--space-12); scroll-margin-top: 96px; }
.gdd-section h2 {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--fg);
  margin: 0 0 var(--space-4);
}
.gdd-anchor {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  margin-left: var(--space-2);
  vertical-align: middle;
  border-radius: var(--radius-sm);
  color: var(--fg-faint);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.gdd-anchor i, .gdd-anchor svg { width: 16px; height: 16px; }
.gdd-section h2:hover .gdd-anchor, .gdd-anchor:focus-visible { opacity: 1; }
.gdd-anchor:hover { color: var(--brand); }
.gdd-anchor:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.gdd-anchor.is-copied { opacity: 1; color: var(--color-emerald-700); }

.gdd-section p, .gdd-steps li, .gdd-list li {
  font-size: 17px;
  line-height: 1.7;
  color: var(--fg-body);
}
.gdd-section > p { margin: 0 0 var(--space-4); max-width: 68ch; }
.gdd-list, .gdd-steps { margin: 0 0 var(--space-6); padding: 0; max-width: 68ch; }
.gdd-list { list-style: none; display: grid; gap: var(--space-2); }
.gdd-list li { position: relative; padding-left: 22px; }
.gdd-list li::before {
  content: "";
  position: absolute; left: 4px; top: 0.72em;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brand);
}
.gdd-steps { list-style: none; counter-reset: gd-step; display: grid; gap: var(--space-3); }
.gdd-steps li { position: relative; padding-left: 44px; counter-increment: gd-step; }
.gdd-steps li::before {
  content: counter(gd-step);
  position: absolute; left: 0; top: 1px;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--color-violet-50);
  border: 1px solid var(--border-brand);
  color: var(--color-violet-700);
  font-size: 13px;
  font-weight: 700;
}
.gdd-note {
  display: flex; align-items: flex-start; gap: var(--space-3);
  margin: 0 0 var(--space-6);
  padding: var(--space-5) var(--space-6);
  max-width: 68ch;
  border: 1px solid var(--border);
  border-left: 3px solid var(--color-teal-600);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}
.gdd-note i, .gdd-note svg { width: 18px; height: 18px; flex: none; margin-top: 4px; color: var(--color-teal-600); }
.gdd-section .gdd-note p { margin: 0; font-size: var(--fs-body); }

.gdd-figure { margin: var(--space-8) 0; }
.gdd-figure img {
  display: block;
  width: 100%; height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  background: var(--color-ivory);
}
.gdd-figure figcaption { margin-top: var(--space-3); font-size: var(--fs-body-sm); color: var(--fg-muted); line-height: var(--lh-relaxed); }

.gdd-section .gdd-caprow {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  margin: var(--space-2) 0 0;
  font-size: var(--fs-body-sm);
  color: var(--fg-muted);
}
.gdd-caplink {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600;
  color: var(--brand);
  text-decoration: none;
}
.gdd-caplink:hover { text-decoration: underline; }
.gdd-caplink:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
.gdd-caplink i, .gdd-caplink svg { width: 14px; height: 14px; }

.gdd-cta {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: var(--space-6);
  margin: var(--space-12) 0 var(--space-8);
  padding: var(--space-8);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  background: var(--color-ivory);
}
.gdd-cta > div { flex: 1 1 320px; }
.gdd-cta h2 { font-family: var(--font-display); font-size: var(--fs-h4); margin: 0 0 var(--space-2); color: var(--fg); }
.gdd-cta p { margin: 0; color: var(--fg-body); line-height: var(--lh-relaxed); }
.gdd-cta .gdd-cta-links { margin-top: var(--space-2); font-size: var(--fs-body-sm); color: var(--fg-muted); }
.gdd-cta-links a { color: var(--brand); font-weight: 600; }

.gdd-back a { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: 600; color: var(--brand); text-decoration: none; }
.gdd-back a:hover { text-decoration: underline; }
.gdd-back a:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
.gdd-back i, .gdd-back svg { width: 16px; height: 16px; }

.gdd-related { background: var(--color-mist); }

@media (max-width: 1100px) {
  .gd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gd-reslist { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gdd-layout { grid-template-columns: 200px minmax(0, 1fr); gap: var(--space-8); }
}
@media (max-width: 860px) {
  .gd-featured { grid-template-columns: minmax(0, 1fr); }
  .gd-featured-art { min-height: 0; height: auto; aspect-ratio: 16 / 10; border-right: 0; border-bottom: 1px solid var(--border); }
  .gd-featured-body { padding: var(--space-6); }
  .gdd-layout { grid-template-columns: minmax(0, 1fr); padding-top: var(--space-8); }
  .gdd-side { display: none; }
  .gdd-toc-mobile {
    display: block;
    margin: 0 0 var(--space-8);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
  }
  .gdd-toc-mobile summary {
    padding: var(--space-4) var(--space-5);
    min-height: 44px;
    font-weight: 600;
    color: var(--fg);
    cursor: pointer;
  }
  .gdd-toc-mobile summary:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-lg); }
  .gdd-toc-mobile ol { padding: 0 var(--space-4) var(--space-4); }
  .gdd-section h2 .gdd-anchor { opacity: 1; }
  .gdd-cta { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  .gd-hero { padding-top: 48px; }
  .gd-grid, .gd-library .gd-grid { grid-template-columns: minmax(0, 1fr); }
  .gd-reslist { grid-template-columns: minmax(0, 1fr); }
  .gd-search { max-width: none; }
  .gd-facet-label { flex-basis: 100%; }
  .gdd-wrap, .gdd-layout { width: min(100% - 32px, 1120px); }
  .gdd-takeaways, .gdd-cta { padding: var(--space-6); }
  .gdd-section p, .gdd-steps li, .gdd-list li { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .gd-card, .gd-featured, .gd-read i, .gd-read svg, .gdd-anchor, .gdd-toc a { transition: none; }
  .gd-card:hover, .gd-featured:hover { transform: none; }
}