:root {
  --signal-focus: #f5b544;
  --signal-danger: #ff8fa3;
  --control-bg: #090a0e;
  --control-border: rgba(255, 255, 255, .12);
}

.explorer-page { min-height: 100vh; background: var(--bg); letter-spacing: 0; }
.explorer-page * { letter-spacing: 0; }

.sitebar {
  position: sticky; top: 0; z-index: 30;
  min-height: 60px; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  background: rgba(11, 12, 16, .96); border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.sitebrand {
  min-height: 44px; display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--serif); font-size: 17px;
}
.brand-signal { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); }
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  min-height: 40px; padding: 0 12px; border-radius: 6px;
  display: inline-flex; align-items: center;
  color: var(--ink-faint); font-size: 13px;
  transition: color .18s ease, background .18s ease, transform .14s ease;
}
.site-nav a:hover { color: var(--ink); background: var(--panel); }
.site-nav a:active { transform: scale(.98); }
.site-nav a[aria-current="page"] { color: var(--gold); background: rgba(245, 181, 68, .08); }

.explorer-wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 44px 0 80px; }
.explorer-head {
  display: flex; align-items: end; justify-content: space-between; gap: 24px;
  padding-bottom: 24px; border-bottom: 1px solid var(--line-2);
}
.explorer-kicker { display: block; margin-bottom: 7px; font: 500 11px/1.2 var(--mono); color: var(--gold); }
.explorer-head h1 { margin: 0; font: 700 32px/1.15 var(--serif); text-wrap: balance; }
.issue-link {
  min-height: 40px; padding: 0 14px; border: 1px solid var(--control-border); border-radius: 6px;
  display: inline-flex; align-items: center; color: var(--ink-dim); font-size: 13px;
  transition: color .18s ease, border-color .18s ease, transform .14s ease;
}
.issue-link:hover { color: var(--gold); border-color: var(--gold); }
.issue-link:active { transform: scale(.98); }
.archive-range { color: var(--ink-faint); font: 12px/1.4 var(--mono); text-align: right; }

.coverage-line {
  min-height: 52px; display: flex; align-items: center;
  flex-wrap: wrap; gap: 6px 14px;
  color: var(--ink-dim); font-size: 13px; border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.coverage-stat { display: inline-flex; align-items: baseline; gap: 4px; white-space: nowrap; }
.coverage-stat b { color: var(--ink); font-family: var(--mono); }
.coverage-stat.issue { color: var(--ink-faint); }

.filter-zone { padding: 20px 0; border-bottom: 1px solid var(--line); }
.search-field { display: block; }
.search-field input {
  width: 100%; height: 44px; padding: 0 14px;
  border: 1px solid var(--control-border); border-radius: 6px;
  background: var(--control-bg); color: var(--ink); font: 14px/1 var(--sans);
  outline: none; transition: border-color .18s ease, box-shadow .18s ease;
}
.search-field input::placeholder { color: var(--ink-faint); }
.search-field input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(245, 181, 68, .1); }
.segment-control { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.segment-control button,
.topic-filters button,
.topic-index button {
  min-height: 40px; border: 1px solid var(--control-border); border-radius: 6px;
  background: transparent; color: var(--ink-faint); font: 13px/1 var(--sans);
  cursor: pointer; transition: color .18s ease, border-color .18s ease, background .18s ease, transform .14s ease;
}
.segment-control button { padding: 0 12px; }
.segment-control button:hover,
.topic-filters button:hover,
.topic-index button:hover { color: var(--ink); border-color: var(--line-2); background: var(--panel); }
.segment-control button:active,
.topic-filters button:active,
.topic-index button:active { transform: scale(.98); }
.segment-control button[aria-pressed="true"] { color: var(--gold); border-color: var(--gold); background: rgba(245, 181, 68, .08); }
.topic-filters { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.topic-filters button { min-height: 32px; padding: 0 9px; font-size: 11px; }
.topic-filters button[aria-pressed="true"] { color: var(--cyan); border-color: var(--cyan); background: rgba(79, 209, 197, .08); }

.signal-list { display: grid; }
.signal-row {
  min-width: 0; padding: 22px 8px;
  display: grid; grid-template-columns: 112px minmax(0, 1fr) 150px; gap: 24px;
  border-bottom: 1px solid var(--line); transition: background .18s ease, color .18s ease;
}
.signal-row:hover { background: rgba(255, 255, 255, .02); }
.signal-section { padding-top: 2px; font: 11px/1.4 var(--mono); color: var(--accent, var(--gold)); }
.signal-main { min-width: 0; }
.signal-main h2 {
  margin: 0; font-size: 17px; line-height: 1.4; font-weight: 600;
  text-wrap: pretty; overflow-wrap: anywhere; word-break: break-word;
}
.signal-row:hover h2 { color: var(--accent, var(--gold)); }
.signal-main p { margin: 8px 0 0; color: var(--ink-dim); font-size: 13.5px; line-height: 1.65; text-wrap: pretty; overflow-wrap: anywhere; }
.signal-topics { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.signal-topic { border: 1px solid var(--line); border-radius: 4px; padding: 2px 7px; color: var(--ink-faint); font-size: 10.5px; }
.signal-side { min-width: 0; text-align: right; color: var(--ink-faint); font: 11.5px/1.6 var(--mono); }
.signal-source { color: var(--ink-dim); overflow-wrap: anywhere; }
.signal-metric { margin-top: 8px; color: var(--gold); font-variant-numeric: tabular-nums; }

.empty-state { padding: 48px 16px; color: var(--ink-faint); text-align: center; border-bottom: 1px solid var(--line); }
.error-state { color: var(--signal-danger); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.topic-search { margin: 20px 0; }
.topic-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 28px; align-items: start; }
.topic-sidebar { position: sticky; top: 80px; }
.topic-index { max-height: calc(100vh - 120px); overflow: auto; border-top: 1px solid var(--line); }
.topic-index button {
  width: 100%; min-height: 48px; padding: 0 10px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  border-width: 0 0 1px; border-radius: 0; text-align: left;
}
.topic-index button span:last-child { font-family: var(--mono); font-size: 11px; font-variant-numeric: tabular-nums; }
.topic-index button[aria-pressed="true"] { color: var(--gold); background: rgba(245, 181, 68, .07); }
.topic-detail { min-width: 0; border-top: 1px solid var(--line); }
.topic-summary { padding: 22px 8px; border-bottom: 1px solid var(--line); }
.topic-summary h2 { margin: 0; font: 700 25px/1.25 var(--serif); }
.topic-summary p { margin: 8px 0 0; color: var(--ink-faint); font-size: 12px; font-variant-numeric: tabular-nums; }
.topic-item {
  display: grid; grid-template-columns: 100px minmax(0, 1fr); gap: 18px;
  padding: 18px 8px; border-bottom: 1px solid var(--line);
  transition: background .18s ease;
}
.topic-item:hover { background: rgba(255, 255, 255, .02); }
.topic-item-date { color: var(--ink-faint); font: 11px/1.5 var(--mono); }
.topic-item h3 { margin: 0; font-size: 15px; line-height: 1.45; }
.topic-item p { margin: 7px 0 0; color: var(--ink-dim); font-size: 13px; line-height: 1.6; }
.topic-item-meta { margin-top: 8px; color: var(--ink-faint); font: 11px/1.4 var(--mono); }

.source-register { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line-2); }
.section-line { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.section-line h2 { margin: 0; font: 700 22px/1.25 var(--serif); }
.section-line span { color: var(--ink-faint); font: 11px/1.4 var(--mono); }
.source-list { margin-top: 14px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 20px; }
.source-entry { min-width: 0; min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 10px; border-bottom: 1px solid var(--line); font-size: 12px; color: var(--ink-dim); }
.source-entry span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.source-entry span:last-child { color: var(--ink-faint); font-family: var(--mono); font-variant-numeric: tabular-nums; }

.explorer-page button:focus-visible,
.explorer-page a:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

@media (max-width: 820px) {
  .signal-row { grid-template-columns: 90px minmax(0, 1fr); gap: 16px; }
  .signal-side { grid-column: 2; text-align: left; }
  .topic-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 20px; }
  .source-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .sitebar { position: static; padding: 10px 16px; flex-direction: column; align-items: stretch; gap: 4px; }
  .sitebrand { min-height: 36px; }
  .site-nav { overflow-x: auto; }
  .site-nav a { flex: 1; justify-content: center; min-width: 64px; }
  .explorer-wrap { width: min(100% - 32px, 1120px); padding-top: 32px; }
  .explorer-head { align-items: center; }
  .explorer-head h1 { font-size: 28px; }
  .issue-link { padding: 0 10px; }
  .signal-row { grid-template-columns: 1fr; gap: 7px; padding: 18px 4px; }
  .signal-side { grid-column: 1; text-align: left; }
  .topic-layout { grid-template-columns: 1fr; }
  .topic-sidebar { position: static; }
  .topic-index { max-height: 280px; }
  .topic-item { grid-template-columns: 1fr; gap: 6px; }
  .source-list { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .explorer-page * { scroll-behavior: auto !important; }
}