/* ============================================================
   css/screen-strata.css — Strata View (PRD v2 Act 3)
   ============================================================ */

#screen-strata {
  background: #09090f;
  align-items: stretch;
  justify-content: stretch;
  padding: 0;
  overflow: hidden;
}

/* ---- Scrollable container — nav-locked from wheel/touch while active ---- */
.strata-scroll {
  position: absolute;
  top: 48px;            /* below global nav */
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
}

.strata-scroll::-webkit-scrollbar          { width: 10px; }
.strata-scroll::-webkit-scrollbar-track    { background: rgba(255,255,255,0.02); }
.strata-scroll::-webkit-scrollbar-thumb    { background: rgba(255,255,255,0.12); border-radius: 10px; }
.strata-scroll::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }

/* ---- Sticky filter chip bar (always visible) ---- */
.strata-chips {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 14px 28px 12px;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.strata-chip-hint {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.58);
}

.strata-chip-hint i {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.4);
}

.strata-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.strata-chip {
  font-family: 'Space Mono', ui-monospace, monospace;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  padding: 4px 13px;
  height: 26px;
  cursor: pointer;
  transition: background-color 160ms ease,
              color 160ms ease,
              border-color 160ms ease,
              box-shadow 160ms ease;
  white-space: nowrap;
}

.strata-chip:hover {
  border-color: var(--chip-color, rgba(255, 255, 255, 0.55));
  color: rgba(255, 255, 255, 1);
  background: rgba(255, 255, 255, 0.1);
}

/* Filled active state: chip's colour becomes the background, text flips dark */
.strata-chip.active {
  color: #0a0a0a;
  background: var(--chip-color, rgba(255, 255, 255, 0.92));
  border-color: var(--chip-color, rgba(255, 255, 255, 0.92));
  font-weight: 700;
  box-shadow: 0 0 14px -4px var(--chip-color, rgba(255, 255, 255, 0.55));
}

.strata-chip.active:hover {
  /* Keep filled look but brighten slightly so user sees hover feedback */
  filter: brightness(1.08);
}

.strata-chip.chip-reset {
  color: rgba(255, 255, 255, 0.88);
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.04);
}

.strata-chip.chip-reset.active {
  color: #0a0a0a;
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(255, 255, 255, 0.95);
}

/* ---- Canvas: holds the 4 bands + bubble layer, height set by JS ---- */
.strata-canvas {
  position: relative;
  width: 100%;
  /* min-height set by JS (we want scroll); min-height below is a floor */
  min-height: 100%;
}

/* ---- Bands (background) ---- */
.strata-bands {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.strata-band {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 32px;
}

.strata-band:first-child { border-top: none; }

.strata-band::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.025), transparent 50%);
  pointer-events: none;
}

/* Band label: horizontally centred at the TOP of each band */
.band-label-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 4px;
  max-width: 82%;
  pointer-events: none;
  position: relative;
  z-index: 3;
}

.band-phase-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.band-phase-name {
  font-family: var(--font-redaction-70);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: rgba(255, 255, 255, 1);
  line-height: 1.1;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.7);
}

.band-years {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 2px;
}

/* Band tint — slightly stronger so bands are visually distinguishable */
.strata-band-pre_covid     { background: linear-gradient(180deg, rgba(79,168,224,0.06), transparent); }
.strata-band-lockdown      { background: linear-gradient(180deg, rgba(208,128,96,0.06), transparent); }
.strata-band-deep_lockdown { background: linear-gradient(180deg, rgba(255,255,255,0.045), transparent); }
.strata-band-post_covid    { background: linear-gradient(180deg, rgba(160,122,220,0.06), transparent); }

/* ---- Bubble layer ---- */
.strata-bubbles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

/* .strata-bubble = outer wrapper (no overflow:hidden, so outside labels
   can render below the circle). The visible circle is .bubble-circle. */
.strata-bubble {
  position: absolute;
  top: 0;
  left: 0;
  width: calc(var(--bubble-r) * 2);
  cursor: pointer;
  pointer-events: auto;
  transition: transform 600ms cubic-bezier(0.22, 1, 0.36, 1),
              opacity 400ms ease;
  will-change: transform, opacity;
}

.bubble-circle {
  position: relative;
  width: calc(var(--bubble-r) * 2);
  height: calc(var(--bubble-r) * 2);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  border: 2px solid var(--bubble-color);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.5),
              0 2px 10px -4px rgba(0, 0, 0, 0.8);
  transition: transform 200ms cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 200ms ease;
}

.strata-bubble:hover .bubble-circle,
.strata-bubble:focus-visible .bubble-circle {
  transform: scale(1.18);
  box-shadow: 0 0 22px -1px var(--bubble-color),
              0 0 0 1px rgba(0, 0, 0, 0.5) inset;
  z-index: 50;
}

.strata-bubble:focus-visible { outline: none; }

/* Fade out non-matches in filter mode (display:none after transition) */
.strata-bubble.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(var(--hidden-x, 0), var(--hidden-y, 0)) scale(0.6) !important;
}

.bubble-gif {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 280ms ease;
  border-radius: 50%;
  pointer-events: none;
}

/* Auto-reveal once the bubble has scrolled into view (set by IntersectionObserver) */
.strata-bubble[data-loaded="1"] .bubble-gif {
  opacity: 1;
}

/* Hover / focus: also ensure GIF is visible (e.g. if user hovers a pre-loaded bubble) */
.strata-bubble:hover .bubble-gif,
.strata-bubble:focus-visible .bubble-gif {
  opacity: 1;
}

/* ---- Bubble labels ---- */
.bubble-label {
  font-family: 'Space Mono', ui-monospace, monospace;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.98);
  text-transform: lowercase;
  pointer-events: none;
  text-shadow: 0 0 6px rgba(0, 0, 0, 1),
               0 0 3px rgba(0, 0, 0, 1);
  transition: opacity 200ms ease;
}

/* Inside the circle: centred, fits visually because bubble is big enough */
.bubble-label.inside {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11.5px;
  letter-spacing: 0.4px;
  padding: 0 8px;
  text-align: center;
  line-height: 1.1;
  z-index: 2;
}

/* Outside (small bubbles OR filter mode): centred below the circle.
   Container sizes to its content (not the small bubble it sits under);
   each line stays on a single row and truncates with ellipsis if it
   would overflow the 180px cap. This prevents the letter-per-line
   break that happens when a flex container shrinks to min-content. */
.bubble-label.outside {
  position: absolute;
  top: calc(var(--bubble-r) * 2 + 3px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 140px;
  padding: 0 1px;
  text-align: center;
  line-height: 1.1;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 0 4px rgba(0, 0, 0, 1);
  z-index: 2;
  pointer-events: none;
}

.bubble-label.outside .bl-term {
  display: block;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.6px;
  color: rgba(255, 255, 255, 0.96);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.bubble-label.outside .bl-meta {
  display: block;
  margin-top: 2px;
  font-size: 9px;
  letter-spacing: 1.1px;
  text-transform: uppercase;
  color: var(--bubble-color, rgba(255, 255, 255, 0.7));
  opacity: 0.94;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Single-line outside label (non-filter, small bubble): no spans,
   container behaves like a plain inline-block that nowraps. */
.bubble-label.outside:not(:has(.bl-term)) {
  white-space: nowrap;
  font-size: 10.5px;
  letter-spacing: 0.8px;
}

/* Once a GIF is loaded it covers the inside label — hide it so text
   doesn't sit on top of the animation. Outside label stays visible. */
.strata-bubble[data-loaded="1"] .bubble-label.inside,
.strata-bubble:hover .bubble-label.inside,
.strata-bubble:focus-visible .bubble-label.inside {
  opacity: 0;
}

.strata-bubble.no-gif .bubble-circle {
  background:
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.03) 0 1px,
      transparent 1px 4px
    ),
    rgba(0, 0, 0, 0.6);
}

/* ---- Scroll-to-bottom hint ----
   Pill with a pulsing stroke-gradient border that sweeps round the
   element, grabbing attention without being intrusive. Fades out 1s
   after the user begins scrolling. */
.strata-scroll-hint {
  position: absolute;
  bottom: 72px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background:
    linear-gradient(#0b0b11, #0b0b11) padding-box,
    conic-gradient(
      from var(--hint-angle, 0deg),
      rgba(255, 255, 255, 0.06) 0%,
      rgba(79, 195, 247, 0.95) 18%,
      rgba(255, 255, 255, 0.8) 30%,
      rgba(255, 255, 255, 0.06) 50%,
      rgba(255, 255, 255, 0.06) 100%
    ) border-box;
  border: 1.5px solid transparent;
  border-radius: 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.92);
  z-index: 6;
  pointer-events: none;
  opacity: 1;
  transition: opacity 500ms ease, transform 500ms ease;
  animation: strata-hint-sweep 3s linear infinite,
             strata-hint-float 2.6s ease-in-out infinite;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5),
              0 0 18px rgba(79, 195, 247, 0.18);
}

.strata-scroll-hint i {
  font-size: 14px;
  color: rgba(79, 195, 247, 0.95);
}

.strata-scroll-hint.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  animation-play-state: paused;
}

/* Animates a CSS custom property so the conic gradient rotates cleanly */
@property --hint-angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

@keyframes strata-hint-sweep {
  to { --hint-angle: 360deg; }
}

@keyframes strata-hint-float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(5px); }
}

@media (prefers-reduced-motion: reduce) {
  .strata-scroll-hint { animation: none; }
}

/* ============================================================
   Bubble detail modal
   ============================================================ */
.bubble-modal[hidden] { display: none; }

.bubble-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5vh 4vw;
  opacity: 0;
  transition: opacity 220ms ease;
}

.bubble-modal.open { opacity: 1; }

.bubble-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
}

.bubble-modal-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 1.2fr) minmax(300px, 1fr);
  gap: 36px;
  width: min(90vw, 960px);
  max-height: 86vh;
  background: #0e0e16;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  box-shadow: 0 24px 90px rgba(0, 0, 0, 0.7);
  padding: 34px 36px;
  transform: scale(0.96);
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.bubble-modal.open .bubble-modal-panel { transform: scale(1); }

.bubble-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.75);
  font-size: 20px;
  cursor: pointer;
  z-index: 2;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.bubble-modal-close:hover,
.bubble-modal-close:focus-visible {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 1);
  outline: none;
}

/* ---- Media (left column) ---- */
.bubble-modal-media {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: start;
}

.bubble-modal-gif {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ---- Body (right column) ---- */
.bubble-modal-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
  overflow-y: auto;
  padding-right: 4px;
}

.bubble-modal-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.bubble-modal-term {
  font-family: var(--font-redaction-70);
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 500;
  letter-spacing: -0.012em;
  color: rgba(255, 255, 255, 1);
  margin: 0;
  text-transform: lowercase;
  overflow-wrap: break-word;
  line-height: 1.05;
}

.bubble-modal-classification {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: var(--bubble-color, rgba(255, 255, 255, 0.85));
  font-weight: 700;
}

/* ---- Meta grid ---- */
.bubble-modal-meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: 24px;
  row-gap: 14px;
  margin: 0;
}

.bubble-modal-meta > div {
  display: contents;
}

.bubble-modal-meta dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
  padding-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---- Help icon + hover/focus tooltip ---- */
.meta-help {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.62);
  font-family: var(--font-body);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0;
  cursor: help;
  position: relative;
  user-select: none;
  transition: background 160ms ease, color 160ms ease;
}

.meta-help:hover,
.meta-help:focus-visible {
  background: rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 1);
  outline: none;
}

.meta-help::after {
  content: attr(data-help);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(-6px);
  width: 240px;
  padding: 10px 12px;
  background: rgba(8, 8, 14, 0.97);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 5px;
  font-family: var(--font-body);
  font-size: 11.5px;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: 0;
  text-transform: none;
  color: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.55);
  pointer-events: none;
  opacity: 0;
  transition: opacity 160ms ease, transform 200ms ease;
  z-index: 30;
  white-space: normal;
}

.meta-help:hover::after,
.meta-help:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.bubble-modal-meta dd {
  font-family: var(--font-body);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.95);
  margin: 0;
  word-break: break-word;
  line-height: 1.4;
}

.bubble-modal-meta dd.mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.78);
}

/* ---- Narrow viewports: stack vertically ---- */
@media (max-width: 820px) {
  .bubble-modal-panel {
    grid-template-columns: 1fr;
    width: 92vw;
    padding: 26px;
    gap: 24px;
  }
  .bubble-modal-media { aspect-ratio: 4 / 3; }
  .bubble-modal-term { font-size: 26px; }
}

/* ---- Filter mode: dissolve the bands, foreground the cluster ----
   Full opacity drop + visibility hidden so the band phase label can't
   be partially read through the cluster. */
#screen-strata.filtered .strata-bands {
  opacity: 0;
  visibility: hidden;
  transition: opacity 400ms ease, visibility 0s linear 400ms;
  pointer-events: none;
}
#screen-strata:not(.filtered) .strata-bands {
  opacity: 1;
  visibility: visible;
  transition: opacity 400ms ease, visibility 0s linear 0s;
}

#screen-strata.filtered .strata-bubble.clustered .bubble-label.outside {
  color: var(--bubble-color);
  opacity: 0.9;
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .strata-bubble,
  .bubble-gif {
    transition-duration: 0.01ms !important;
  }
  .strata-bubble:hover,
  .strata-bubble:focus-visible {
    transform: scale(1.08);
  }
  .strata-bubble.pulse { animation: none; }
}