/* ==========================================================================
   filter-overlay.css — FAB + live filter menu (panel under the FAB; bottom
   sheet on mobile). Colors ONLY via tokens (var(--*)) — zero hex (tokens.css).

   Filter mode does NOT cover or blur the CV: the menu floats over a corner and
   the cards reflow live beside it.
   z-index map: 50 header  70 .filter-overlay menu  80 .filter-fab (toggle)
   ========================================================================== */

/* ---------- FAB ----------------------------------------------------------- */

.filter-fab {
  position: fixed;
  right: var(--space-4);
  top: calc(var(--bar1-h, 58px) + var(--space-2));
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 20px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--c-surface) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--c-text);
  font-family: var(--font-heading);
  font-size: var(--fs-2);
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 24px color-mix(in srgb, var(--c-bg) 70%, transparent),
              0 0 0 1px var(--c-border);
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out) .45s,
              visibility 0s linear .45s;
}

/* The desktop footbar (js/footbar.js, ≥768px) fully replaces the Filter FAB:
   hide the FAB and its menu on desktop. The FAB stays on MOBILE (<768px, shown
   via body.in-experience below) until the mobile build gets its own filter UI.
   `display:none !important` wins over any opacity/visibility show rule. */
@media (min-width: 768px) {
  .filter-fab,
  .filter-overlay { display: none !important; }
}

/* periodic shimmer ring (~every 7s) to attract attention to Filters */
@property --fab-a {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

.filter-fab::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-pill);
  padding: 2px;
  background: conic-gradient(
    from var(--fab-a),
    transparent 0turn,
    transparent .68turn,
    var(--c-accent-1) .8turn,
    var(--c-accent-2) .87turn,
    transparent .96turn
  );
  -webkit-mask: linear-gradient(currentColor 0 0) content-box, linear-gradient(currentColor 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(currentColor 0 0) content-box, linear-gradient(currentColor 0 0);
  mask-composite: exclude;
  opacity: 0;
  pointer-events: none;
  animation: fab-shimmer 7s linear infinite 2.5s;
}

@keyframes fab-shimmer {
  0%, 76% { opacity: 0; --fab-a: 0deg; }
  79% { opacity: 1; }
  90% { opacity: 1; }
  94% { opacity: 0; --fab-a: 720deg; }
  100% { opacity: 0; --fab-a: 720deg; }
}

/* Slow psychedelic colour drift for the mobile "Filters" button (below). */
@keyframes filter-psy { to { background-position: 300% 50%; } }

.filter-fab:hover {
  transform: translateY(-2px);
  border-color: var(--ui-filter-border-hover);
  box-shadow: 0 6px 28px var(--c-glow);
}

.filter-fab:focus-visible {
  outline: 2px solid var(--c-focus-ring);
  outline-offset: 3px;
}

.filter-fab__icon {
  display: inline-block;
  color: var(--c-accent-1);
  font-size: var(--fs-3);
  line-height: 1;
  transition: transform var(--dur-slow) var(--ease-inout), color var(--dur-base) var(--ease-out);
}

.filter-fab.is-open .filter-fab__icon {
  transform: rotate(135deg);
  color: var(--c-accent-3);
}

.filter-fab.is-open {
  border-color: color-mix(in srgb, var(--c-accent-3) 55%, transparent);
}

/* active-filter count badge */
.filter-fab__badge {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  display: inline-grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--c-accent-1);
  color: var(--c-bg);
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 0 12px var(--c-glow);
}

.filter-fab__badge[hidden] { display: none; }

/* ---------- overlay shell ------------------------------------------------- */

.filter-overlay {
  position: fixed;
  top: calc(var(--bar1-h, 58px) + var(--space-2) + 54px); /* just under the FAB */
  right: var(--space-4);
  bottom: var(--space-4); /* fill the height, minimal padding to page bottom */
  z-index: 70;
  width: min(420px, calc(100vw - var(--space-4) * 2));
  display: flex;
  flex-direction: column;
  background: color-mix(in srgb, var(--c-bg-elevated) 95%, transparent);
  border: 2px solid color-mix(in srgb, var(--c-text) 22%, var(--c-border));
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 70px color-mix(in srgb, var(--c-bg) 82%, transparent),
              0 0 0 1px var(--c-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: hidden;
}

.filter-overlay[hidden] {
  display: none;
}

.filter-overlay__top,
.filter-overlay__bottom {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  flex: 0 0 auto;
}

.filter-overlay__top {
  border-bottom: 1px solid var(--c-border);
}

.filter-overlay__bottom {
  border-top: 1px solid var(--c-border);
  padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
  justify-content: space-between;
  flex-wrap: wrap;
}

/* ---------- top bar: live readout ----------------------------------------- */

.filter-live {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.filter-headline {
  font-family: var(--font-heading);
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.filter-counters {
  font-size: var(--fs-1);
  color: var(--c-accent-1);
  letter-spacing: .04em;
}

/* ---------- buttons -------------------------------------------------------- */

.filter-btn {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
  font-family: var(--font-heading);
  font-size: var(--fs-2);
  font-weight: 500;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}

.filter-btn:focus-visible {
  outline: 2px solid var(--c-focus-ring);
  outline-offset: 2px;
}

.filter-btn--ghost {
  background: transparent;
  color: var(--c-text-dim);
}

.filter-btn--ghost:hover {
  color: var(--c-text);
  background: var(--c-surface-hover);
}

.filter-btn--primary {
  background: var(--c-accent-1);
  border-color: transparent;
  color: var(--c-bg);
  font-weight: 700;
  box-shadow: 0 0 20px var(--c-glow);
}

.filter-btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 32px var(--c-glow);
}

.filter-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- active chips (bottom) + fallback panel chips ------------------ */

.filter-active-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  min-height: 38px;
}

.filter-active-chips__empty {
  color: var(--c-text-faint);
  font-size: var(--fs-1);
}

.filter-active-chip {
  --chip-c: var(--c-accent-1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--chip-c) 55%, transparent);
  background: color-mix(in srgb, var(--chip-c) 12%, transparent);
  color: var(--c-text);
  font-size: var(--fs-1);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.filter-active-chip:hover {
  background: color-mix(in srgb, var(--chip-c) 24%, transparent);
}

.filter-active-chip:focus-visible {
  outline: 2px solid var(--c-focus-ring);
  outline-offset: 2px;
}

.filter-active-chip.is-active,
.filter-active-chip[aria-pressed="true"] {
  background: color-mix(in srgb, var(--chip-c) 30%, transparent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--chip-c) 45%, transparent);
  border-color: var(--chip-c);
}

/* ---------- chip menu (per-domain rounded tag buttons) -------------------- */

.filter-chip-panel {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-3);
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.filter-chip-panel[hidden] {
  display: none;
}

.filter-chip-panel__group {
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--chip-c, var(--c-accent-1));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--c-surface) 80%, transparent);
  padding: var(--space-3);
}

.filter-chip-panel__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--fs-3);
  color: var(--chip-c, var(--c-text));
}

.filter-chip-panel__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Hover effect MOVED here from the (now non-interactive) tag-pills: the menu
   chip ignites in its domain colour — glow ring + lift + brighter fill. */
.filter-chip-panel__chips .filter-active-chip {
  transition:
    transform    var(--dur-fast) var(--ease-out),
    background   var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    box-shadow   var(--dur-base) var(--ease-out);
}
.filter-chip-panel__chips .filter-active-chip:hover {
  transform: translateY(-1px) scale(1.04);
  background: color-mix(in srgb, var(--chip-c) 28%, transparent);
  border-color: var(--chip-c);
  box-shadow:
    0 0 16px color-mix(in srgb, var(--chip-c) 55%, transparent),
    inset 0 0 10px color-mix(in srgb, var(--chip-c) 22%, transparent);
}

/* ---------- domain drill: domain row → one domain's expskills ------------- */

.filter-domains {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-content: start;
}

.filter-domain-chip {
  --chip-c: var(--c-accent-1);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--chip-c) 55%, transparent);
  background: color-mix(in srgb, var(--chip-c) 14%, transparent);
  color: var(--c-text);
  font-family: var(--font-heading);
  font-size: var(--fs-2);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.filter-domain-chip:hover {
  transform: translateY(-1px);
  background: color-mix(in srgb, var(--chip-c) 22%, transparent);
  border-color: var(--chip-c);
}

.filter-domain-chip.has-active {
  border-color: var(--chip-c);
  box-shadow: 0 0 14px color-mix(in srgb, var(--chip-c) 40%, transparent);
}

.filter-domain-chip__badge {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  display: inline-grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--chip-c);
  color: var(--c-bg);
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
}

.filter-drill-head {
  --chip-c: var(--c-accent-1);
  margin-bottom: var(--space-2);
}

.filter-drill-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--chip-c) 55%, transparent);
  background: color-mix(in srgb, var(--chip-c) 12%, transparent);
  color: var(--chip-c);
  font-family: var(--font-heading);
  font-size: var(--fs-2);
  font-weight: 600;
  cursor: pointer;
}

.filter-drill-back span { font-size: 1.4em; line-height: 0; }

.filter-drill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* dead-end expskill — selecting it would zero the results: greyed + inert. */
.filter-active-chip.is-dead {
  opacity: 0.3;
  filter: grayscale(0.7);
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- responsive: bottom sheet on mobile ---------------------------- */

@media (max-width: 767px) {
  /* While the full-page overlay is open, FREEZE the page behind it so a touch on
     the overlay can't pan / rubber-band the document (esp. the left-right drift a
     circular finger caused). Mobile only — desktop keeps the floating panel + live
     card reflow, so its page must stay scrollable. */
  /* The panel now covers only the bottom ~1/3; the compressed (L0) Experiences
     stay visible (and scrollable) in the 2/3 above, so DON'T freeze the page —
     just keep the panel's own scroll from chaining to the document. */
  body.mode-filter .filter-overlay,
  body.mode-filter .filter-chip-panel {
    touch-action: pan-y;
    overscroll-behavior: contain;
  }

  /* Bottom panel ≈ 1/3 of the VISIBLE viewport. dvh tracks the address bar, so the
     split adapts as it shows/hides. The L0 Experiences sit in the 2/3 above. The
     panel is a sheet: edge-to-edge with rounded TOP corners. (Fase 1 shell — the
     exact fraction/feel is tuned on-device in Fase 5.) */
  .filter-overlay {
    top: auto;
    right: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    /* lvh (large viewport, address-bar HIDDEN) is static — unlike dvh it does NOT
       shrink when the bar reappears, so the panel keeps its size. JS then pins an
       exact px height on open (fitMobilePanel). */
    height: 38lvh;
    max-height: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  /* No title bar inside the panel. The close ✕ FLOATS top-right and stays put no
     matter how the content evolves; the live readout (headline + counter) is gone
     on mobile — the L0 preview above is the feedback. */
  .filter-overlay__top {
    position: absolute;
    top: 0;
    right: 0;
    left: auto;
    width: auto;
    padding: var(--space-2);
    border-bottom: 0;
    background: transparent;
    z-index: 3;
  }

  .filter-live { display: none; }

  /* Compact, fixed-size ✕ so its footprint is known and the content can reserve
     exactly its space (no wide text-button tucking chips under its left edge). */
  #filter-close {
    width: 40px;
    height: 40px;
    padding: 0;
    display: grid;
    place-items: center;
    font-size: var(--fs-3);
    line-height: 1;
  }

  /* The domain (Exp) chips start at the very TOP, on the X's level — the right
     padding reserves the ✕'s full footprint (8 inset + 40 button + gap) so nothing
     ever lands under it; everything else reflows into the remaining width. */
  .filter-chip-panel {
    padding: var(--space-2);
    padding-right: 56px;
    gap: var(--space-2);
  }

  .filter-overlay__bottom { padding: var(--space-2) var(--space-3); }

  /* The active-filters + Reset bar shows ONLY once at least one expskill is on. */
  .filter-overlay:not(.has-filters) .filter-overlay__bottom {
    display: none;
  }

  .filter-chip-panel__group { padding: var(--space-2); }

  .filter-chip-panel__title {
    font-size: var(--fs-2);
    margin-bottom: var(--space-1);
  }

  .filter-chip-panel__chips { gap: 6px; }

  .filter-chip-panel .filter-active-chip { padding: 4px 10px; }

  .filter-fab {
    padding: 13px 30px;   /* a bit wider (req) */
    /* Psychedelic, slowly-drifting multicolour background — built from the
       ACCENT hues (electric purple / cyan / pink) rather than the pastel domain
       palette, which washed out even at full strength. Seamless loop: the first
       and last stops match so the drift never jumps. Accents are already vivid,
       so only a light saturate/brighten and no backdrop blur. */
    background: linear-gradient(100deg,
      var(--c-accent-1),
      var(--c-accent-2),
      var(--c-accent-3),
      var(--c-accent-2),
      var(--c-accent-1));
    background-size: 300% 100%;
    animation: filter-psy 16s linear infinite;
    filter: saturate(1.15) brightness(1.04);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .filter-fab__label {
    display: inline;   /* show "Filters" — the labelled, self-explaining entry */
    /* soft dark backing so the label stays readable over the full-colour drift */
    text-shadow: 0 1px 4px color-mix(in srgb, var(--c-bg) 75%, transparent);
  }

  /* white halo behind the ◈ so it doesn't dissolve into the full-colour bg */
  .filter-fab__icon {
    text-shadow: 0 0 9px white, 0 0 4px white;
  }

  /* Bottom-centred "Filters" button (replaces the old center-right FAB): a clear,
     self-explaining entry point, with the active-count badge reading "Filters ②". */
  .filter-fab {
    top: auto;
    right: auto;
    left: 50%;
    bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    transform: translateX(-50%);
  }
  /* keep the horizontal centring through the base :hover lift (touch can latch
     :hover, which would otherwise drop the translateX and jump the button left). */
  .filter-fab:hover {
    transform: translateX(-50%) translateY(-2px);
  }

  /* Part A: hidden by default; shown only while #experience is in view
     (body.in-experience toggled by IntersectionObserver in main.js).
     Placed late + high-specificity so it wins over the has-orbit / scene-nav
     desktop rules (those classes are never set on mobile). */
  .filter-fab {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .25s ease;
  }

  body.in-experience .filter-fab {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  /* CHANGE 2 — hide the FAB while the overlay is open (it has its own × close).
     .is-open is added by filter-scene.js enterFilterMode() → fab.classList.add.
     body.in-experience .filter-fab has specificity (0,2,0); use (0,2,0)+.is-open
     = (0,3,0) to guarantee this wins. */
  body.in-experience .filter-fab.is-open {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .15s ease;
  }
}

/* Extra compaction for very short phones (≤680px tall, e.g. 360×640).
   Panel was 48 px over budget at 640 — drop group/chip padding one notch. */
@media (max-width: 767px) and (max-height: 680px) {
  .filter-chip-panel {
    padding: var(--space-1);  /* 4px instead of 8px */
    /* keep the ✕'s reserved footprint — the `padding` shorthand above would
       otherwise reset padding-right and let the top domain chip (e.g. "3D & XR")
       slide under the close button on short phones / when the address bar shrinks
       the height below 680px (#3). */
    padding-right: 56px;
    gap: var(--space-1);
  }
  .filter-chip-panel__group { padding: var(--space-1) var(--space-2); } /* 4px 8px */
  .filter-chip-panel .filter-active-chip { padding: 3px 8px; }
  .filter-chip-panel__chips { gap: 4px; }
  .filter-overlay__top,
  .filter-overlay__bottom { padding: var(--space-1) var(--space-2); }
}

/* ---------- reduced motion ------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .filter-fab,
  .filter-fab__icon,
  .filter-btn {
    transition: none;
  }

  /* no shimmer / no psychedelic drift under reduced motion */
  .filter-fab { animation: none; }
  .filter-fab::after {
    animation: none;
    opacity: 0;
  }
}