/* ==========================================================================
   Topic Trends — "The Narrowing"
   Homepage branding: --rc-* tokens from /css/main.css (dark, Inter, cyan
   accent). NOT the esoteric Ether Art Chart palette — this is the plain,
   data-forward Compass surface.
   ========================================================================== */

.tt-main {
  max-width: var(--rc-max-width, 1200px);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  font-family: var(--rc-font, 'Inter', sans-serif);
  color: var(--rc-text, #c8c8d8);
}

/* ─── Hero ─────────────────────────────────────────────────────────── */

.tt-hero { margin-bottom: 2rem; max-width: 52rem; }

.tt-kicker {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rc-accent, #00d4aa);
  margin: 0 0 0.5rem;
}

.tt-title {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
  color: var(--rc-text-bright, #eeeef4);
}

.tt-framing {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--rc-text, #c8c8d8);
  margin: 0;
}

/* ─── Coverage caveat ──────────────────────────────────────────────── */

.tt-caveat {
  margin: 0 0 2.5rem;
  padding: 0.85rem 1.1rem;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--rc-text-dim, #c0c0ca);
  background: var(--rc-accent-subtle, rgba(0, 212, 170, 0.08));
  border: 1px solid var(--rc-border, #2a2a3e);
  border-left: 3px solid var(--rc-accent, #00d4aa);
  border-radius: var(--rc-radius-md, 6px);
}
.tt-caveat strong { color: var(--rc-text-bright, #eeeef4); }
.tt-caveat[hidden] { display: none; }

/* ─── Topics / Themes toggle ───────────────────────────────────────── */

.tt-toggle {
  display: inline-flex;
  gap: 0;
  margin: 0 0 0.5rem;
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: 999px;
  padding: 0.25rem;
  background: var(--rc-bg-panel, #12121e);
}
.tt-toggle-btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--rc-text-dim, #c0c0ca);
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.tt-toggle-btn:hover { color: var(--rc-text-bright, #eeeef4); }
.tt-toggle-btn.is-active {
  color: var(--rc-bg-dark, #0a0a14);
  background: var(--rc-accent, #00d4aa);
}

/* ─── Explorer panel (reuses homepage .card / .era-tabs / .traj-* chrome) ─── */

.tt-card { margin-top: 1.5rem; }

/* Header: shrunk era-tabs (left) + inline Chart/Group filters (right), sharing
   one underline that runs the full card width. */
.tt-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  border-bottom: 1px solid var(--rc-border, #2a2a3e);
  margin: -0.5rem -0.5rem 1.1rem;
  padding: 0 0.5rem;
}
.tt-card .era-tabs { border-bottom: none; margin: 0; padding: 0; flex: 0 1 auto; }
.tt-card .era-tab { flex: 0 0 auto; }

.tt-controls { display: flex; align-items: flex-end; gap: 1.3rem; padding-bottom: 0.5rem; }
.tt-control { display: inline-flex; align-items: center; gap: 0.5rem; }
.tt-control-lbl {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--rc-text-dim, #c0c0ca);
}
.tt-fgroup { display: inline-flex; gap: 0.4rem; }
.tt-fbtn {
  font: 600 0.8rem/1 var(--rc-font, Inter, system-ui, sans-serif);
  color: var(--rc-text-dim, #c0c0ca);
  background: transparent;
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: 7px;
  padding: 0.36rem 0.72rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.tt-fbtn:hover { color: var(--rc-text-bright, #eeeef4); border-color: var(--rc-text-dim, #c0c0ca); }
.tt-fbtn.active {
  color: var(--rc-accent, #00d4aa);
  border-color: var(--rc-accent, #00d4aa);
  background: rgba(0, 212, 170, 0.12);
}

/* Inline band labels in the left gutter + leader lines. */
.tt-lbl {
  font-family: var(--rc-font, Inter, system-ui, sans-serif);
  font-size: 11px;
  font-weight: 600;
  cursor: default;
  transition: opacity 0.15s;
}
.tt-lbl.is-dim { opacity: 0.22; }
.tt-lbl-lead { stroke-width: 1; opacity: 0.5; }
.tt-lbl-dot { opacity: 0.9; }
.tt-chart-sub {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--rc-text-dim, #c0c0ca);
  margin: 0 0 0.9rem;
}

/* Our chart SVGs fill the chart-area like the homepage trajectory svg does. */
#tt-chart svg { display: block; width: 100%; height: auto; }
#tt-chart { cursor: grab; }
.traj-overview.is-active ~ * #tt-chart, #tt-chart:active { cursor: grabbing; }

/* ─── (legacy) Unified explorer panel ──────────────────────────────── */

.tt-panel {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rc-border, #2a2a3e);
}

.tt-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  align-items: center;
  margin-bottom: 1.2rem;
}
.tt-filter { display: inline-flex; align-items: center; gap: 0.5rem; }
.tt-filter-lbl {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rc-text-dim, #c0c0ca);
}

.tt-seg {
  display: inline-flex;
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: 999px;
  padding: 0.2rem;
  background: var(--rc-bg-panel, #12121e);
}
.tt-seg-btn {
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--rc-text-dim, #c0c0ca);
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.tt-seg-btn:hover { color: var(--rc-text-bright, #eeeef4); }
.tt-seg-btn.is-active {
  color: var(--rc-bg-dark, #0a0a14);
  background: var(--rc-accent, #00d4aa);
}

.tt-panel-head { margin-bottom: 1rem; }

.tt-segment {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-top: 0.9rem;
}
.tt-segment[hidden] { display: none; }
.tt-seg-row { display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap; }

/* Mini-overview locator + draggable brace */
.tt-overview {
  position: relative;
  height: 32px;
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: var(--rc-radius-sm, 4px);
  background: var(--rc-bg-panel, #12121e);
  cursor: pointer;
  user-select: none;
}
.tt-ov-svg { display: block; width: 100%; height: 100%; }
.tt-ov-line { stroke: var(--rc-text-dim, #c0c0ca); opacity: 0.45; stroke-width: 1; }
.tt-ov-vp {
  position: absolute;
  top: 0; bottom: 0;
  background: rgba(0, 212, 170, 0.16);
  border: 1px solid var(--rc-accent, #00d4aa);
  border-radius: 3px;
  cursor: grab;
  box-sizing: border-box;
}
.tt-overview.is-active .tt-ov-vp { cursor: grabbing; }
.tt-ov-h {
  position: absolute;
  top: -1px; bottom: -1px;
  width: 9px;
  cursor: ew-resize;
}
.tt-ov-h--l { left: -5px; }
.tt-ov-h--r { right: -5px; }
.tt-ov-h::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 2px; height: 14px;
  background: var(--rc-accent, #00d4aa);
  border-radius: 1px;
}

/* Time Machine */
.tt-tm:empty { display: none; }
.tt-tm-slider {
  width: 100%;
  accent-color: var(--rc-accent, #00d4aa);
  cursor: pointer;
}
.tt-tm-pb { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.4rem; }
.tt-tm-btn {
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--rc-text-dim, #c0c0ca);
  background: var(--rc-bg-panel, #12121e);
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: 999px;
  min-width: 1.9rem;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.tt-tm-btn:hover { color: var(--rc-text-bright, #eeeef4); border-color: var(--rc-accent, #00d4aa); }
.tt-tm-prog {
  flex: 1;
  height: 3px;
  background: var(--rc-border, #2a2a3e);
  border-radius: 2px;
  overflow: hidden;
}
.tt-tm-prog-fill { height: 100%; background: var(--rc-accent, #00d4aa); }
.tt-tm-reset { margin-left: auto; }

.tt-tm-marker {
  stroke: var(--rc-accent, #00d4aa);
  stroke-width: 1;
  opacity: 0.8;
  stroke-dasharray: 3 2;
}
.tt-span-btn {
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--rc-text-dim, #c0c0ca);
  background: var(--rc-bg-panel, #12121e);
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.tt-span-btn + .tt-span-btn { margin-left: 0.3rem; }
.tt-span-btn:hover { color: var(--rc-text-bright, #eeeef4); }
.tt-span-btn.is-active {
  color: var(--rc-bg-dark, #0a0a14);
  background: var(--rc-accent, #00d4aa);
  border-color: var(--rc-accent, #00d4aa);
}
.tt-span-readout {
  font-family: var(--rc-font-mono, 'JetBrains Mono', monospace);
  font-size: 0.78rem;
  color: var(--rc-text-dim, #c0c0ca);
}

/* ─── Sections ─────────────────────────────────────────────────────── */

.tt-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rc-border, #2a2a3e);
}

.tt-section-head { margin-bottom: 1.4rem; }

.tt-section-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--rc-text-bright, #eeeef4);
  margin: 0 0 0.4rem;
}

.tt-section-sub {
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--rc-text-dim, #c0c0ca);
  margin: 0;
  max-width: 46rem;
}
.tt-section-sub sup { font-size: 0.7em; }

/* ─── Chart shells ─────────────────────────────────────────────────── */

.tt-chart-wrap {
  position: relative;
  background: var(--rc-bg-panel, #12121e);
  border: 1px solid var(--rc-border, #2a2a3e);
  border-radius: var(--rc-radius-lg, 8px);
  padding: 0.5rem;
}

.tt-chart-area { display: block; width: 100%; }
.tt-chart-area svg { display: block; width: 100%; height: auto; }

.tt-chart-status {
  padding: 2.5rem 1.2rem;
  text-align: center;
  color: var(--rc-text-dim, #c0c0ca);
  font-style: italic;
  font-size: 0.95rem;
}
.tt-chart-status[hidden] { display: none; }
.tt-chart-note {
  font-style: normal;
  text-align: left;
  padding: 0.85rem 1.1rem;
  border-left: 3px solid var(--rc-accent, #00d4aa);
  background: var(--rc-accent-subtle, rgba(0, 212, 170, 0.08));
  border-radius: var(--rc-radius-sm, 4px);
  margin: 0.4rem;
}

/* ─── The Narrowing Index (line) ───────────────────────────────────── */

.tt-grid { stroke: var(--rc-border, #2a2a3e); stroke-width: 1; opacity: 0.6; }
.tt-y-label, .tt-x-label {
  fill: var(--rc-text-dim, #c0c0ca);
  font-family: var(--rc-font-mono, 'JetBrains Mono', monospace);
  font-size: 11px;
}
.tt-tick { stroke: var(--rc-text-dim, #c0c0ca); stroke-width: 0.5; opacity: 0.5; }
.tt-axis-title {
  fill: var(--rc-text-dim, #c0c0ca);
  font-family: var(--rc-font, Inter, system-ui, sans-serif);
  font-size: 12px;
  letter-spacing: 0.02em;
  opacity: 0.85;
}

.tt-index-line {
  stroke: var(--rc-accent, #00d4aa);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.tt-index-dot {
  fill: var(--rc-bg-panel, #12121e);
  stroke: var(--rc-accent, #00d4aa);
  stroke-width: 2;
}
.tt-hover-line {
  stroke: var(--rc-text-bright, #eeeef4);
  stroke-width: 1;
  stroke-dasharray: 3 3;
  opacity: 0.45;
  pointer-events: none;
}

/* ─── The Topic River (streamgraph) ────────────────────────────────── */

.tt-band {
  stroke: var(--rc-bg-panel, #12121e);
  stroke-width: 1;
  stroke-linejoin: round;
  transition: opacity 0.18s ease;
  cursor: pointer;
}
.tt-band.is-dim { opacity: 0.28; }

.tt-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--rc-text-dim, #c0c0ca);
}
.tt-legend[hidden] { display: none; }
.tt-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: default;
}
.tt-legend-swatch {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  flex: none;
}

/* ─── Single-year field fallback (bars) ────────────────────────────── */

.tt-field { padding: 0.8rem 0.6rem; display: flex; flex-direction: column; gap: 0.5rem; }
.tt-field-row {
  display: grid;
  grid-template-columns: 9rem 1fr 3.2rem;
  align-items: center;
  gap: 0.8rem;
}
.tt-field-label {
  font-size: 0.9rem;
  color: var(--rc-text, #c8c8d8);
  text-transform: capitalize;
  text-align: right;
}
.tt-field-bar {
  height: 0.85rem;
  background: var(--rc-bg-card, #181828);
  border-radius: 999px;
  overflow: hidden;
}
.tt-field-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: width 0.9s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.tt-field-pct {
  font-family: var(--rc-font-mono, monospace);
  font-size: 0.82rem;
  color: var(--rc-text-dim, #c0c0ca);
  text-align: right;
}

/* ─── Tooltips ─────────────────────────────────────────────────────── */

#tt-wrap { position: relative; }
.tt-tooltip {
  position: absolute;
  z-index: 10;
  top: 1rem;
  pointer-events: none;
  background: var(--rc-bg-card, #181828);
  border: 1px solid var(--rc-border-ui, #646490);
  border-radius: var(--rc-radius-md, 6px);
  padding: 0.5rem 0.7rem;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
  min-width: 9rem;
  max-width: 18rem;
  font-size: 0.85rem;
  color: var(--rc-text, #c8c8d8);
}
.tt-tooltip[hidden] { display: none; }
.tt-tt-head {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  color: var(--rc-text-bright, #eeeef4);
  text-transform: capitalize;
  margin-bottom: 0.2rem;
}
.tt-tt-big {
  font-family: var(--rc-font-mono, monospace);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--rc-accent, #00d4aa);
}
.tt-tt-big span {
  font-family: var(--rc-font, sans-serif);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--rc-text-dim, #c0c0ca);
}
.tt-tt-sub {
  font-size: 0.8rem;
  color: var(--rc-text-dim, #c0c0ca);
  margin-top: 0.15rem;
}
.tt-tt-theme {
  font-size: 0.76rem;
  color: var(--rc-accent, #00d4aa);
  margin: 0.05rem 0 0.1rem;
}

/* ─── Method note ──────────────────────────────────────────────────── */

.tt-method p {
  font-size: 0.96rem;
  line-height: 1.65;
  color: var(--rc-text-dim, #c0c0ca);
  max-width: 48rem;
  margin: 0.6rem 0 0;
}
.tt-method sup { font-size: 0.7em; }

/* ─── Mobile ───────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .tt-main { padding: 2rem 1rem 3rem; }
  .tt-field-row { grid-template-columns: 6.5rem 1fr 2.8rem; gap: 0.5rem; }
  .tt-field-label { font-size: 0.8rem; }
  /* Tabs on their own line, then the Chart/Group filters wrap below instead of
     running off the right edge (was flex-wrap:nowrap -> page overflow). */
  .tt-head { gap: 0.75rem 1rem; }
  .tt-card .era-tabs { flex: 1 0 100%; }
  .tt-controls { flex-wrap: wrap; gap: 0.55rem 1.1rem; width: 100%; padding-bottom: 0.4rem; }
  .tt-control { gap: 0.4rem; }
  .tt-fbtn { padding: 0.32rem 0.6rem; font-size: 0.78rem; }
}