/* Approach/Retreat — SERP experiment styles
   8:1 minimum contrast on all text. */

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-hover: #1a1a1a;
  --border: #2a2a2a;
  --text: #e8e8e8;          /* on #0a0a0a = 16.5:1 */
  --text-secondary: #b0b0b0; /* on #0a0a0a = 10.3:1 */
  --text-meta: #909090;      /* on #0a0a0a = 8.1:1 */
  --accent: #6ea8fe;         /* on #0a0a0a = 8.4:1 */
  --accent-visited: #a78bfa; /* on #0a0a0a = 8.2:1 */
  --link: #6ea8fe;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 2rem 1.5rem;
}

/* Each layout sets its own max-width via .page wrapper */
.page {
  margin: 0 auto;
  max-width: 720px;
}
body.layout-two-pane .page,
body.layout-card-grid .page {
  max-width: 1180px;
}
body.layout-dense .page {
  max-width: 780px;
}
body.layout-rich-thumbnail .page {
  max-width: 860px;
}

/* Question switcher (top of every SERP page) */
.question-switcher {
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.question-switcher select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  font-family: inherit;
  margin-left: 0.5rem;
}
.question-switcher select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* --- Header --- */

.site-header {
  margin-bottom: 2.5rem;
}

.site-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.description {
  color: var(--text-meta);
  font-size: 0.95rem;
  max-width: 580px;
}

/* --- Landing: hero CTA link --- */

.hero-links {
  margin-top: 1.25rem;
}
.repo-link {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 0.6rem 1.1rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s, border-color 0.15s;
}
.repo-link:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}

/* --- Landing: debug panel mock (always-visible version of .ar-debug) --- */

.debug-mock-wrapper {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
  margin-bottom: 1.25rem;
}
.ar-debug.debug-mock {
  display: block;
  position: static;
  margin: 0;
  min-width: 260px;
  font-size: 0.8rem;
}
.ar-debug.debug-mock .debug-classes-mock {
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}
.ar-debug.debug-mock span { color: var(--text); }
.debug-mock-caption p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0.75rem;
}
.debug-mock-caption p:last-child { margin-bottom: 0; }
.debug-mock-caption code {
  background: var(--surface);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.82rem;
  color: var(--text);
}
.debug-mock-caption strong { color: var(--text); }
@media (max-width: 680px) {
  .debug-mock-wrapper { grid-template-columns: minmax(0, 1fr); }
}

/* --- Landing: full schema tables --- */

.subsection-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 1.75rem;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.schema-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
  margin-bottom: 0.75rem;
}
.schema-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem 1.1rem;
}
.schema-group-wide { grid-column: 1 / -1; }
.schema-group h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
.schema-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  line-height: 1.5;
}
.schema-table th {
  text-align: left;
  font-weight: 400;
  padding: 0.28rem 0.6rem 0.28rem 0;
  vertical-align: top;
  white-space: nowrap;
  color: var(--text);
  width: 1%;
}
.schema-table td {
  color: var(--text-secondary);
  padding: 0.28rem 0;
  vertical-align: top;
}
.schema-table th code,
.schema-table td code {
  background: var(--bg);
  color: var(--text);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.78rem;
}
.schema-note {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
.schema-note code {
  background: var(--bg);
  color: var(--text);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.8rem;
}
.schema-source {
  font-size: 0.8rem;
  color: var(--text-meta);
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}
.schema-source a { color: var(--accent); text-decoration: none; }
.schema-source a:hover { text-decoration: underline; }

/* --- Landing: "every example" matrix --- */

.examples-matrix-wrap {
  overflow-x: auto;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.examples-matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  min-width: 620px;
}
.examples-matrix thead th {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-meta);
  letter-spacing: 0.05em;
  font-weight: 600;
  padding: 0.7rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.examples-matrix tbody th {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.6rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  vertical-align: middle;
}
.examples-matrix tbody td {
  padding: 0.3rem 0.5rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.examples-matrix tbody tr:last-child th,
.examples-matrix tbody tr:last-child td { border-bottom: none; }
.examples-matrix td a {
  color: var(--accent);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
  font-size: 0.8rem;
}
.examples-matrix td a:hover {
  background: var(--surface-hover);
  text-decoration: underline;
}

/* --- Landing: section headings --- */

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  margin-top: 2.25rem;
}
.section-sub {
  color: var(--text-meta);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.section-sub code {
  background: var(--surface);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.85rem;
}

/* --- Landing: layout picker cards --- */

.layout-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.layout-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  overflow: hidden;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.layout-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
}
.layout-card:active {
  transform: translateY(1px);
}
.layout-card .layout-thumb {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.layout-card-body {
  padding: 0.85rem 1rem 1rem;
}
.layout-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
}
.layout-card-desc {
  font-size: 0.85rem;
  color: var(--text-meta);
  line-height: 1.5;
}

/* --- Landing: question picker cards --- */

.question-cards {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 2rem;
}
.question-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid transparent;
  border-radius: 6px;
  padding: 0.9rem 1.15rem;
  text-align: left;
  color: inherit;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.question-card:hover {
  background: var(--surface-hover);
  border-color: var(--border);
}
.question-card.selected {
  border-left-color: var(--accent);
  background: var(--surface-hover);
}
.question-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.question-card-meta {
  font-size: 0.75rem;
  color: var(--text-meta);
  margin-bottom: 0.2rem;
}
.question-card-sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Query list (landing page) — legacy, kept for any old link --- */

.query-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 3rem;
}

.query-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.query-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}

.query-text {
  display: block;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.query-card:visited .query-text {
  color: var(--accent-visited);
}

.query-meta {
  display: block;
  font-size: 0.85rem;
  color: var(--text-meta);
}

/* --- SERP page --- */

.serp-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.serp-query {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.serp-info {
  font-size: 0.85rem;
  color: var(--text-meta);
}

.serp-results {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Individual result — styled like a Google SERP snippet */
.result {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.result:last-child {
  border-bottom: none;
}

.result-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.15rem;
  line-height: 1.4;
}

.result:hover .result-title {
  text-decoration: underline;
}

.result-url {
  font-size: 0.8rem;
  color: var(--text-meta);
  margin-bottom: 0.35rem;
}

.result-snippet {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.result-meta {
  font-size: 0.8rem;
  color: var(--text-meta);
  margin-top: 0.35rem;
}

/* --- Ad result --- */

.result.result-ad {
  background: #121218;
  border: 1px solid #2a2a3a;
  border-radius: 6px;
  margin: 0.5rem 0;
  padding: 1.25rem 1.5rem;
}

.result-ad .result-title {
  color: var(--accent);
}

.result-ad .result-url {
  color: #8888cc; /* on #121218 = 8.2:1 */
}

.result-sponsored {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: #b0b0b0; /* on #121218 = 9.4:1 */
  border: 1px solid #444;
  border-radius: 3px;
  padding: 1px 5px;
  margin-right: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.03em;
}

/* --- Expanded result (reading view) --- */

.result.expanded {
  background: var(--surface);
  margin: 0.5rem -1rem;
  padding: 1.5rem;
  border-radius: 6px;
  border-bottom: none;
}

.result-full-text {
  display: none;
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
  white-space: pre-wrap;
}

.result.expanded .result-full-text {
  display: block;
}

/* --- Footer --- */

.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-meta);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.credits {
  margin-top: 0.5rem;
}

/* ============================================================
   Layout variants — each demonstrates a different SERP idiom.
   The library is layout-agnostic: an element with [data-result]
   is an AOI regardless of where or how it's laid out.
   ============================================================ */

/* --- layout: wide-two-pane --- */

body.layout-two-pane .serp-body {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: 1.5rem;
  align-items: start;
}
body.layout-two-pane .serp-results {
  display: flex;
  flex-direction: column;
  gap: 0;
}
body.layout-two-pane .result {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  border-left: 2px solid transparent;
  cursor: pointer;
}
body.layout-two-pane .result:hover {
  background: var(--surface);
}
body.layout-two-pane .result.selected {
  background: var(--surface);
  border-left-color: var(--accent);
}
body.layout-two-pane .result-title {
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}
body.layout-two-pane .result-url {
  font-size: 0.72rem;
  margin-bottom: 0.1rem;
}
body.layout-two-pane .result-snippet {
  font-size: 0.8rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
body.layout-two-pane .result-meta { display: none; }
body.layout-two-pane .result-full-text { display: none !important; }

.reading-pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  position: sticky;
  top: 1rem;
  min-height: 300px;
}
.reading-pane .placeholder {
  color: var(--text-meta);
  font-style: italic;
}
.reading-pane .rp-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 0.35rem;
}
.reading-pane .rp-author {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}
.reading-pane .rp-meta {
  font-size: 0.8rem;
  color: var(--text-meta);
  margin-bottom: 1rem;
}
.reading-pane .rp-body {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
  white-space: pre-wrap;
}

/* --- layout: card-grid --- */

body.layout-card-grid .serp-results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
body.layout-card-grid .result {
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
body.layout-card-grid .result:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}
body.layout-card-grid .result-title { font-size: 1rem; margin-bottom: 0.2rem; }
body.layout-card-grid .result-url { font-size: 0.72rem; }
body.layout-card-grid .result-snippet {
  font-size: 0.85rem;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
body.layout-card-grid .result.expanded {
  grid-column: 1 / -1;
  margin: 0;
}
body.layout-card-grid .result.expanded .result-snippet {
  -webkit-line-clamp: unset;
  display: block;
}

/* --- layout: dense-titles-only --- */

body.layout-dense .serp-results { gap: 0; }
body.layout-dense .result {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1.75rem 1fr auto;
  align-items: baseline;
  gap: 0.6rem;
  cursor: pointer;
}
body.layout-dense .result::before {
  content: counter(serp-rank);
  counter-increment: serp-rank;
  font-size: 0.85rem;
  color: var(--text-meta);
  text-align: right;
}
body.layout-dense .serp-results { counter-reset: serp-rank; }
body.layout-dense .result-title {
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
  line-height: 1.35;
}
body.layout-dense .result-url,
body.layout-dense .result-snippet {
  display: none;
}
body.layout-dense .result-meta {
  font-size: 0.75rem;
  margin: 0;
  grid-column: 3;
  grid-row: 1;
  white-space: nowrap;
}
body.layout-dense .result-full-text {
  grid-column: 2 / -1;
  margin-top: 0.5rem;
}
body.layout-dense .result.expanded {
  padding: 0.75rem 0;
}

/* --- layout: rich-thumbnail --- */

body.layout-rich-thumbnail .serp-results { gap: 0.5rem; }
body.layout-rich-thumbnail .result {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1.25rem;
  cursor: pointer;
  align-items: start;
}
body.layout-rich-thumbnail .result-thumbnail {
  width: 160px;
  height: 90px;
  border-radius: 6px;
  background:
    radial-gradient(circle at 22% 32%, #6ea8fe 0 10px, transparent 11px),
    linear-gradient(to bottom, #1a1a24 0%, #0f0f18 100%);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
body.layout-rich-thumbnail .result-thumbnail::after {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 48px;
  background:
    linear-gradient(135deg, transparent 40%, #2a2a3a 40% 52%, transparent 52% 62%, #2a2a3a 62% 76%, transparent 76%);
  clip-path: polygon(0 100%, 12% 55%, 28% 75%, 46% 40%, 62% 68%, 80% 35%, 100% 70%, 100% 100%);
}
body.layout-rich-thumbnail .result-body { min-width: 0; }
body.layout-rich-thumbnail .result-title { font-size: 1.05rem; }
body.layout-rich-thumbnail .result-snippet {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
body.layout-rich-thumbnail .result.expanded .result-snippet {
  -webkit-line-clamp: unset;
  display: block;
}
body.layout-rich-thumbnail .result.expanded {
  grid-template-columns: 160px 1fr;
}

/* --- layout: horizontal-carousels ---
   Netflix/RecGaze idiom. Answers are bucketed into horizontal rows by era;
   each row scrolls independently. Tests a 2D decision topology (within-row
   horizontal scan vs between-row vertical navigation).
   Inspired by the carousel stimuli in RecGaze (de Leon-Martinez et al.,
   SIGIR 2025) — our content, their layout shape. */

body.layout-horizontal-carousels .page {
  max-width: 1180px;
}
body.layout-horizontal-carousels .serp-results {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
body.layout-horizontal-carousels .carousel-row {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
body.layout-horizontal-carousels .carousel-row-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}
body.layout-horizontal-carousels .carousel-strip {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 0.25rem 0 0.75rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
body.layout-horizontal-carousels .carousel-strip::-webkit-scrollbar {
  height: 8px;
}
body.layout-horizontal-carousels .carousel-strip::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
body.layout-horizontal-carousels .carousel-strip::-webkit-scrollbar-track {
  background: transparent;
}
body.layout-horizontal-carousels .result {
  flex: 0 0 280px;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  scroll-snap-align: start;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  white-space: normal;
}
body.layout-horizontal-carousels .result:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}
body.layout-horizontal-carousels .result-title {
  font-size: 1rem;
  margin-bottom: 0.2rem;
}
body.layout-horizontal-carousels .result-url {
  font-size: 0.72rem;
}
body.layout-horizontal-carousels .result-snippet {
  font-size: 0.85rem;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
body.layout-horizontal-carousels .result.expanded {
  flex: 0 0 420px;
}
body.layout-horizontal-carousels .result.expanded .result-snippet {
  -webkit-line-clamp: unset;
  display: block;
}

/* --- Signals debug overlay (dev only) --- */

.ar-debug {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: rgba(10, 10, 10, 0.95);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  font-family: 'SF Mono', Monaco, monospace;
  color: var(--text-meta);
  max-width: 280px;
  display: none;
}

body.ar-debug-on .ar-debug {
  display: block;
}