/* Discover page: main-app discovery surface. */
.discover-page {
  --ex-bg: #f6f7f9;
  --ex-surface: #ffffff;
  --ex-surface-2: #f0f2f5;
  --ex-border: #e3e6ea;
  --ex-border-strong: #cbd2da;
  --ex-text: #1a1d21;
  --ex-text-muted: #5b6573;
  --ex-text-faint: #8a93a0;
  --ex-accent: #2f6df6;
  --ex-accent-soft: #e8f0ff;
  --ex-rel-advance: #2f9e6b;
  --ex-rel-perspective: #d6622b;
  --ex-rel-evidence: #2f6df6;
  --ex-rel-apply: #c39a17;
  --ex-rel-synthesize: #c2417e;
  --ex-shadow-sm: 0 1px 2px rgba(20, 25, 35, 0.06);
  --ex-shadow-md: 0 6px 20px rgba(20, 25, 35, 0.1);
  --ex-radius: 14px;
  --ex-radius-sm: 9px;
  --ex-section-gap: 26px;
  width: min(1100px, calc(100vw - 96px));
  max-width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: var(--ex-section-gap);
  margin: 0 auto;
  padding: 24px 18px 80px;
  color: var(--ex-text);
}

.discover-page .ex-head {
  margin: 0;
}

.discover-page .ex-head h1 {
  margin: 0 0 4px;
  color: var(--ex-text);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.discover-page .ex-head p {
  margin: 0;
  color: var(--ex-text-muted);
  font-size: 14px;
  font-weight: 400;
}

.discover-page .ex-head .ex-src {
  margin-top: 4px;
  color: var(--ex-text-faint);
  font-size: 12px;
}

.discover-page .ex-surprise {
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--ex-rel-perspective) 28%, var(--ex-border));
  border-radius: var(--ex-radius);
  background: linear-gradient(135deg, color-mix(in srgb, var(--ex-rel-perspective) 7%, var(--ex-surface)), var(--ex-surface));
  padding: 16px;
}

.discover-page .ex-surprise-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.discover-page .ex-surprise-spark {
  color: var(--ex-rel-perspective);
  font-size: 16px;
  font-weight: 700;
}

.discover-page .ex-surprise-head strong {
  color: var(--ex-text);
  font-size: 15px;
  font-weight: 700;
}

.discover-page .ex-surprise-sub {
  color: var(--ex-text-faint);
  font-size: 12px;
}

.discover-page .ex-surprise-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 1fr);
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.discover-page .ex-surprise-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--ex-border);
  border-radius: var(--ex-radius-sm);
  background: var(--ex-surface);
  padding: 12px;
  color: var(--ex-text);
  text-align: left;
  transition: box-shadow 0.15s, border-color 0.15s, transform 0.08s;
}

.discover-page .ex-surprise-card:hover,
.discover-page .ex-surprise-card:focus-visible {
  border-color: var(--ex-rel-perspective);
  box-shadow: var(--ex-shadow-md);
  outline: none;
  transform: translateY(-1px);
}

.discover-page .ex-surprise-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.discover-page .ex-surprise-title {
  overflow: hidden;
  display: -webkit-box;
  color: var(--ex-text);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.discover-page .ex-surprise-from {
  color: var(--ex-text-faint);
  font-size: 11.5px;
  font-weight: 400;
}

.discover-page .ex-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.discover-page .ex-sort {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.discover-page .ex-chip {
  border: 1px solid var(--ex-border);
  border-radius: 999px;
  background: var(--ex-surface);
  color: var(--ex-text-muted);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
}

.discover-page .ex-chip.is-active {
  border-color: var(--ex-accent);
  background: var(--ex-accent);
  color: #ffffff;
}

.discover-page .ex-filterbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.discover-page .ex-relationbar {
  align-items: center;
  margin: 0;
}

.discover-page .ex-topic-shell {
  margin: 0;
}

.discover-page .ex-topic-grid {
  display: block;
  margin-bottom: 0;
  text-align: justify;
  text-align-last: left;
  line-height: 0;
}

.discover-page .ex-topic-grid .ex-filter {
  margin: 0 0 6px;
  vertical-align: top;
  line-height: normal;
}

.discover-page .ex-filter {
  border: 1px solid var(--ex-border);
  border-radius: 999px;
  background: var(--ex-surface);
  color: var(--ex-text-muted);
  padding: 4px 11px;
  font-size: 12.5px;
  font-weight: 500;
}

.discover-page .ex-filter[hidden] {
  display: none;
}

.discover-page .ex-filter.is-active {
  border-color: var(--ex-accent);
  background: var(--ex-accent-soft);
  color: var(--ex-text);
}

.discover-page .ex-topic-pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 10px auto 0;
  color: var(--ex-text-faint);
  line-height: 1;
}

.discover-page .ex-topic-pager[hidden] {
  display: none;
}

.discover-page .ex-topic-page-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 28px;
}

.discover-page .ex-topic-page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.discover-page .ex-topic-page-range {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  color: var(--ex-text-faint);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.discover-page .ex-topic-page-ellipsis {
  color: var(--ex-text-faint);
  font-size: 12px;
  font-weight: 600;
}

.discover-page .ex-topic-page-arrow,
.discover-page .ex-topic-page-number {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--ex-text-muted);
  padding: 0;
  font-size: 12px;
  font-weight: 600;
}

.discover-page .ex-topic-page-arrow:hover:not(:disabled),
.discover-page .ex-topic-page-arrow:focus-visible,
.discover-page .ex-topic-page-number:hover,
.discover-page .ex-topic-page-number:focus-visible {
  border-color: var(--ex-accent);
  color: var(--ex-accent);
  outline: none;
}

.discover-page .ex-topic-page-number.is-active {
  background: var(--ex-surface-2);
  color: var(--ex-text);
  border-color: var(--ex-surface-2);
}

.discover-page .ex-topic-page-arrow:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.discover-page .ex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}

.discover-page .tc-card {
  border: 1px solid var(--ex-border);
  border-radius: var(--ex-radius);
  background: var(--ex-surface);
  box-shadow: var(--ex-shadow-sm);
}

.discover-page .ex-lineage {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  color: var(--ex-text);
  text-align: left;
  transition: box-shadow 0.15s, transform 0.08s, border-color 0.15s;
}

.discover-page .ex-lineage:hover,
.discover-page .ex-lineage:focus-within {
  border-color: var(--ex-border-strong);
  box-shadow: var(--ex-shadow-md);
  outline: none;
}

.discover-page .ex-lineage h3 {
  margin: 0;
  color: var(--ex-text);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.discover-page .ex-title-button {
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  font: inherit;
  text-align: left;
}

.discover-page .ex-title-button:hover,
.discover-page .ex-title-button:focus-visible {
  color: var(--ex-accent);
  outline: none;
}

.discover-page .ex-source-link {
  overflow: hidden;
  display: block;
  color: var(--ex-accent);
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.discover-page .ex-source-link:hover,
.discover-page .ex-source-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.discover-page .ex-summary {
  overflow: hidden;
  display: -webkit-box;
  margin: 0;
  color: var(--ex-text-muted);
  font-size: 13.5px;
  font-weight: 400;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.discover-page .ex-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 0;
}

.discover-page .ex-metric {
  border-radius: 7px;
  background: var(--ex-surface-2);
  color: var(--ex-text-muted);
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 500;
}

.discover-page .ex-metric b {
  color: var(--ex-text);
  font-weight: 700;
}

.discover-page .ex-lineage-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 2px;
}

.discover-page .meta-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  color: var(--ex-text-faint);
  font-size: 12.5px;
}

.discover-page .ex-host-link {
  color: inherit;
  text-decoration: none;
}

.discover-page .ex-host-link:hover,
.discover-page .ex-host-link:focus-visible {
  color: var(--ex-accent);
  text-decoration: underline;
  outline: none;
}

.discover-page .meta-dot::before {
  content: ".";
  margin-left: 2px;
}

.discover-page .badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--ex-border);
  border-radius: 999px;
  background: var(--ex-surface-2);
  color: var(--ex-text-muted);
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 600;
}

.discover-page .badge-cap {
  border-color: color-mix(in srgb, var(--ex-rel-perspective) 35%, var(--ex-border));
  background: color-mix(in srgb, var(--ex-rel-perspective) 8%, transparent);
  color: var(--ex-rel-perspective);
}

.discover-page .badge-ext {
  color: var(--ex-text-muted);
}

.discover-page .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--ex-border-strong);
  border-radius: 999px;
  background: var(--ex-surface);
  color: var(--ex-text);
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
}

.discover-page .btn-ghost {
  border-color: transparent;
  background: transparent;
}

.discover-page .btn-sm {
  padding: 5px 11px;
  font-size: 13px;
}

.discover-page .rel-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: color-mix(in srgb, currentColor 12%, transparent);
  padding: 2px 9px;
  font-size: 12px;
  font-weight: 700;
}

.discover-page .rel-glyph {
  font-size: 12px;
}

.discover-page .rel-explain,
.discover-page .rel-evidence {
  color: var(--ex-rel-evidence);
}

.discover-page .rel-advance {
  color: var(--ex-rel-advance);
}

.discover-page .rel-perspective {
  color: var(--ex-rel-perspective);
}

.discover-page .rel-apply {
  color: var(--ex-rel-apply);
}

.discover-page .rel-synthesize {
  color: var(--ex-rel-synthesize);
}

.discover-page .rel-general {
  color: var(--ex-text-muted);
}

.discover-page .tc-state {
  border: 1px dashed var(--ex-border-strong);
  border-radius: var(--ex-radius);
  background: var(--ex-surface);
  color: var(--ex-text-muted);
  padding: 48px 20px;
  text-align: center;
}

@media (max-width: 760px) {
  .discover-page {
    width: 100%;
    padding: 22px 14px 64px;
  }

  .discover-page .ex-grid {
    grid-template-columns: 1fr;
  }

  .discover-page .ex-lineage-foot {
    align-items: flex-start;
    flex-direction: column;
  }
}