/* ============================================================
   Community Thrive — Interactive design layer
   Pairs with js/interactive.js. Uses the tokens from css/styles.css.
   Docs + copy-paste markup: css/INTERACTIVE-COMPONENTS.md
   ============================================================ */

:root {
  --ix-radius: 16px;
  --ix-radius-sm: 10px;
  --ix-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ix-mono: 'Space Grotesk', 'Inter', sans-serif;
  --ix-ring: 0 0 0 3px rgba(74, 222, 128, 0.55);
}

/* Shared helpers ---------------------------------------------------------- */
.ix-sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.ix-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ix-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted, #94A3B8);
}
.ix-hint::before {
  content: '';
  width: 22px; height: 2px;
  background: var(--green, #22C55E);
  border-radius: 2px;
}

.ix-btn-icon {
  display: inline-grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background: rgba(34, 197, 94, 0.08);
  color: var(--text-primary, #F1F5F9);
  font: 700 1.1rem/1 var(--ix-mono);
  cursor: pointer;
  transition: background .25s, border-color .25s, transform .25s var(--ix-ease);
}
.ix-btn-icon:hover { background: rgba(34, 197, 94, 0.2); border-color: var(--green-bright, #4ADE80); }
.ix-btn-icon:active { transform: scale(0.94); }

[data-spin-block] :focus-visible,
[data-spin-block]:focus-visible,
.ix-btn-icon:focus-visible,
.flip-card-toggle:focus-visible,
.ix-tab:focus-visible,
.ix-quiz-option:focus-visible,
.num-card:focus-visible,
.back-to-top:focus-visible,
.ix-marquee-toggle:focus-visible,
[data-lightbox] a:focus-visible,
.ix-lightbox button:focus-visible,
.impact-slider input[type="range"]:focus-visible {
  outline: none;
  box-shadow: var(--ix-ring);
}

/* ==========================================================================
   a. SPIN BLOCK  (data-spin-block)
   ========================================================================== */
.spin-block {
  --spin-size: min(340px, 78vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  width: 100%;
  max-width: 100%;
  user-select: none;
  -webkit-user-select: none;
}

.spin-stage {
  position: relative;
  width: var(--spin-size);
  height: var(--spin-size);
  perspective: 1100px;
  cursor: grab;
  touch-action: pan-y;
  border-radius: var(--ix-radius);
}
.spin-stage.is-dragging { cursor: grabbing; }

.spin-cube {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.7s var(--ix-ease);
  will-change: transform;
}
.spin-stage.is-dragging .spin-cube { transition: none; }

.spin-block [data-face] {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.4rem;
  padding: 1.5rem;
  border-radius: var(--ix-radius);
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background-color: var(--bg-card, #2D4055);
  background-image:
    linear-gradient(180deg, rgba(15, 24, 34, 0.05) 0%, rgba(15, 24, 34, 0.55) 55%, rgba(15, 24, 34, 0.94) 100%),
    var(--face-bg, linear-gradient(135deg, #243447, #1A2332));
  background-size: cover;
  background-position: center;
  color: var(--text-primary, #F1F5F9);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.35), inset 0 0 0 1px rgba(255,255,255,0.03);
  overflow: hidden;
}
.spin-block [data-face] h3,
.spin-block [data-face] h4 { font-size: 1.35rem; line-height: 1.2; }
.spin-block [data-face] p { color: var(--text-secondary, #CBD5E1); font-size: 0.95rem; }
.spin-block [data-face] .spin-face-num {
  position: absolute;
  top: 1.1rem; left: 1.25rem;
  font: 700 0.8rem/1 var(--ix-mono);
  letter-spacing: 0.12em;
  color: var(--green-bright, #4ADE80);
}

.spin-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 100%;
}
.spin-counter {
  min-width: 11rem;
  text-align: center;
  font: 700 0.85rem/1.3 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-primary, #F1F5F9);
}
.spin-counter .spin-counter-num { color: var(--green-bright, #4ADE80); }
.spin-counter .spin-counter-total { color: var(--text-muted, #94A3B8); }

.spin-dots { display: flex; gap: 0.4rem; justify-content: center; }
.spin-dots button {
  width: 10px; height: 10px; padding: 0;
  border-radius: 50%;
  border: 1px solid var(--green, #22C55E);
  background: transparent;
  cursor: pointer;
  transition: background .25s, transform .25s;
  /* bigger hit area without visual change */
  position: relative;
}
.spin-dots button::after { content: ''; position: absolute; inset: -8px; }
.spin-dots button[aria-current="true"] { background: var(--green, #22C55E); transform: scale(1.25); }

/* ==========================================================================
   b. MARQUEE  (data-marquee)
   ========================================================================== */
.marquee {
  --marquee-shift: -50%;
  --marquee-duration: 30s;
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  contain: inline-size; /* never let the long track widen its parent */
  padding: 1.1rem 0;
  border-top: 1px solid var(--border-subtle, rgba(34,197,94,.15));
  border-bottom: 1px solid var(--border-subtle, rgba(34,197,94,.15));
  background: rgba(15, 24, 34, 0.45);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.marquee-track {
  display: flex;
  width: max-content;
  animation: ix-marquee var(--marquee-duration) linear infinite;
}
.marquee[data-direction="reverse"] .marquee-track { animation-direction: reverse; }
.marquee:hover .marquee-track,
.marquee:focus-within .marquee-track,
.marquee.is-paused .marquee-track { animation-play-state: paused; }

.marquee-group {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}
.marquee-group > * {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  font: 700 clamp(1.1rem, 2.6vw, 1.9rem)/1.1 var(--ix-mono);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--text-primary, #F1F5F9);
}
.marquee-group > *::after {
  content: '/';
  margin: 0 1.1em;
  color: var(--green, #22C55E);
  font-weight: 500;
}
.marquee-group > *:nth-child(even) { color: transparent; -webkit-text-stroke: 1px rgba(203, 213, 225, 0.75); }
.marquee--solid .marquee-group > *:nth-child(even) { color: var(--text-primary, #F1F5F9); -webkit-text-stroke: 0; }
.marquee--small .marquee-group > * { font-size: clamp(0.85rem, 1.6vw, 1.05rem); letter-spacing: 0.08em; }

.ix-marquee-toggle {
  position: absolute;
  right: 0.5rem; top: 50%;
  transform: translateY(-50%);
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background: rgba(15, 24, 34, 0.85);
  color: var(--text-secondary, #CBD5E1);
  font-size: 0.7rem;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity .2s;
  z-index: 1;
}
.marquee:hover .ix-marquee-toggle,
.ix-marquee-toggle:focus-visible { opacity: 1; }

@keyframes ix-marquee {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(var(--marquee-shift), 0, 0); }
}

/* ==========================================================================
   c. IMPACT SLIDER  (data-impact-slider)
   ========================================================================== */
.impact-slider {
  --fill: 0%;
  display: grid;
  gap: 1rem;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  border-radius: var(--ix-radius);
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background:
    radial-gradient(circle at 100% 0%, rgba(34, 197, 94, 0.14), transparent 55%),
    var(--bg-elevated, #1F2D3D);
}
.impact-label {
  font: 700 0.75rem/1.3 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted, #94A3B8);
}
.impact-number {
  font: 700 clamp(2.75rem, 11vw, 5.5rem)/1 var(--ix-mono);
  letter-spacing: -0.04em;
  color: var(--text-primary, #F1F5F9);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.impact-number .impact-affix { color: var(--green-bright, #4ADE80); }

.impact-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 44px; /* touch target */
  background: transparent;
  cursor: pointer;
  margin: 0;
}
.impact-slider input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--green, #22C55E) 0 var(--fill), rgba(148, 163, 184, 0.25) var(--fill) 100%);
}
.impact-slider input[type="range"]::-moz-range-track {
  height: 8px; border-radius: 8px; background: rgba(148, 163, 184, 0.25);
}
.impact-slider input[type="range"]::-moz-range-progress {
  height: 8px; border-radius: 8px; background: var(--green, #22C55E);
}
.impact-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px; height: 28px;
  margin-top: -10px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--green, #22C55E);
  box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.18), 0 4px 14px rgba(0,0,0,0.4);
  transition: transform .2s;
}
.impact-slider input[type="range"]::-moz-range-thumb {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--green, #22C55E);
  box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.18);
}
.impact-slider input[type="range"]:active::-webkit-slider-thumb { transform: scale(1.15); }

.impact-range-ends {
  display: flex;
  justify-content: space-between;
  font: 600 0.75rem/1 var(--ix-mono);
  color: var(--text-muted, #94A3B8);
  letter-spacing: 0.08em;
}
.impact-outputs {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: 0.75rem;
  margin: 0.25rem 0 0;
  padding: 0;
}
.impact-outputs > li {
  padding: 1rem 1.1rem;
  border-radius: var(--ix-radius-sm);
  background: rgba(15, 24, 34, 0.55);
  border: 1px solid var(--border-subtle, rgba(34,197,94,.15));
  color: var(--text-secondary, #CBD5E1);
  font-size: 0.92rem;
  line-height: 1.4;
}
.impact-outputs [data-impact-output] {
  display: block;
  font: 700 1.75rem/1.1 var(--ix-mono);
  color: var(--green-bright, #4ADE80);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.2rem;
}

/* ==========================================================================
   d. REVEAL ON SCROLL  (data-reveal) — only hidden once JS is confirmed
   ========================================================================== */
.ix-js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity 0.8s var(--ix-ease), transform 0.8s var(--ix-ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.ix-js [data-reveal="left"]  { transform: translate3d(-36px, 0, 0); }
.ix-js [data-reveal="right"] { transform: translate3d(36px, 0, 0); }
.ix-js [data-reveal="zoom"]  { transform: scale(0.94); }
.ix-js [data-reveal="fade"]  { transform: none; }
.ix-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ==========================================================================
   e. COUNT-UP  (data-count-to)
   ========================================================================== */
[data-count-to] { font-variant-numeric: tabular-nums; }

/* ==========================================================================
   f. FLIP CARD  (data-flip-card)
   ========================================================================== */
.flip-card {
  perspective: 1200px;
  min-height: 240px;
  cursor: pointer;
}
.flip-card-inner {
  position: relative;
  display: grid;
  height: 100%;
  min-height: inherit;
  transform-style: preserve-3d;
  transition: transform 0.75s var(--ix-ease);
}
.flip-card.is-flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-card-front,
.flip-card-back {
  grid-area: 1 / 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.6rem 1.5rem 4rem;
  border-radius: var(--ix-radius);
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  position: relative;
  overflow: hidden;
}
.flip-card-front {
  background-color: var(--bg-card, #2D4055);
  background-image:
    linear-gradient(180deg, rgba(15,24,34,0.1), rgba(15,24,34,0.9)),
    var(--face-bg, linear-gradient(135deg, #2D4055, #1F2D3D));
  background-size: cover;
  background-position: center;
  justify-content: flex-end;
}
.flip-card-back {
  transform: rotateY(180deg);
  background:
    radial-gradient(circle at 0% 0%, rgba(34,197,94,0.22), transparent 60%),
    var(--bg-elevated, #1F2D3D);
  color: var(--text-secondary, #CBD5E1);
}
.flip-card-front h3, .flip-card-back h3 { color: var(--text-primary, #F1F5F9); font-size: 1.25rem; }
.flip-card-toggle {
  position: absolute;
  left: 1.5rem; bottom: 1.1rem;
  display: inline-flex; align-items: center; gap: 0.4rem;
  min-height: 36px;
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background: rgba(15, 24, 34, 0.6);
  color: var(--green-bright, #4ADE80);
  font: 700 0.72rem/1 var(--ix-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}
.flip-card-toggle:hover { background: rgba(34, 197, 94, 0.18); }
.flip-card:hover:not(.is-flipped) .flip-card-inner { transform: rotateY(6deg); }

/* ==========================================================================
   g. TABS  (data-tabs)
   ========================================================================== */
.ix-tablist {
  display: flex;
  gap: 0.4rem;
  padding: 0.35rem;
  border-radius: 50px;
  background: rgba(15, 24, 34, 0.6);
  border: 1px solid var(--border-subtle, rgba(34,197,94,.15));
  overflow-x: auto;
  scrollbar-width: none;
  max-width: 100%;
  width: max-content;
  margin-bottom: 1.5rem;
}
.ix-tablist::-webkit-scrollbar { display: none; }
.ix-tab {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 0.55rem 1.15rem;
  border: 0;
  border-radius: 50px;
  background: transparent;
  color: var(--text-secondary, #CBD5E1);
  font: 600 0.92rem/1 'Inter', sans-serif;
  cursor: pointer;
  transition: background .25s, color .25s;
  white-space: nowrap;
}
.ix-tab:hover { color: var(--text-primary, #F1F5F9); background: rgba(34, 197, 94, 0.08); }
.ix-tab[aria-selected="true"] {
  background: linear-gradient(135deg, var(--green, #22C55E), var(--emerald, #10B981));
  color: #fff;
}
.ix-tabpanel { animation: ix-fade-up 0.45s var(--ix-ease); }
.ix-tabpanel[hidden] { display: none; }
.ix-tabpanel:focus-visible { outline: 2px dashed rgba(74, 222, 128, 0.5); outline-offset: 6px; border-radius: 6px; }

@keyframes ix-fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}

/* ==========================================================================
   h. QUIZ / CHOOSER  (data-quiz)
   ========================================================================== */
.ix-quiz {
  padding: clamp(1.25rem, 4vw, 2.25rem);
  border-radius: var(--ix-radius);
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background:
    radial-gradient(circle at 0% 100%, rgba(16, 185, 129, 0.14), transparent 55%),
    var(--bg-elevated, #1F2D3D);
}
.ix-quiz-progress {
  font: 700 0.75rem/1 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-bright, #4ADE80);
  margin-bottom: 0.75rem;
}
.ix-quiz-q {
  font: 700 clamp(1.25rem, 3vw, 1.65rem)/1.25 var(--ix-mono);
  color: var(--text-primary, #F1F5F9);
  margin-bottom: 1.1rem;
}
.ix-quiz-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: 0.75rem;
}
.ix-quiz-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 56px;
  padding: 0.9rem 1.1rem;
  text-align: left;
  border-radius: var(--ix-radius-sm);
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background: rgba(15, 24, 34, 0.55);
  color: var(--text-primary, #F1F5F9);
  font: 600 0.98rem/1.3 'Inter', sans-serif;
  cursor: pointer;
  transition: border-color .25s, background .25s, transform .25s var(--ix-ease);
}
.ix-quiz-option:hover { border-color: var(--green-bright, #4ADE80); background: rgba(34, 197, 94, 0.1); transform: translateY(-2px); }
.ix-quiz-option[aria-pressed="true"] { border-color: var(--green, #22C55E); background: rgba(34, 197, 94, 0.18); }
.ix-quiz-option .ix-quiz-key {
  flex: 0 0 auto;
  display: grid; place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: rgba(34, 197, 94, 0.15);
  color: var(--green-bright, #4ADE80);
  font: 700 0.8rem/1 var(--ix-mono);
}
.ix-quiz [data-quiz-step][hidden],
.ix-quiz [data-result][hidden] { display: none; }
.ix-quiz [data-result] {
  animation: ix-fade-up 0.5s var(--ix-ease);
  padding: 1.25rem 0 0;
}
.ix-quiz [data-result]:focus { outline: none; }
.ix-quiz [data-result] h3, .ix-quiz [data-result] h4 { color: var(--text-primary, #F1F5F9); margin-bottom: 0.4rem; }
.ix-quiz [data-result] p { color: var(--text-secondary, #CBD5E1); margin-bottom: 1rem; }
.ix-quiz-reset {
  margin-top: 1rem;
  background: none;
  border: 0;
  color: var(--text-muted, #94A3B8);
  font: 700 0.75rem/1 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0.6rem 0;
}
.ix-quiz-reset:hover { color: var(--green-bright, #4ADE80); }
.ix-quiz-reset[hidden] { display: none; }

/* ==========================================================================
   i. NUMBERED LINK CARDS  (.num-card) — CSS only
   ========================================================================== */
.num-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 1rem;
}
.num-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-height: 220px;
  padding: 1.5rem;
  border-radius: var(--ix-radius);
  border: 1px solid var(--border-subtle, rgba(34,197,94,.15));
  background: var(--bg-elevated, #1F2D3D);
  color: var(--text-primary, #F1F5F9);
  text-decoration: none;
  overflow: hidden;
  isolation: isolate;
  transition: border-color .35s, transform .35s var(--ix-ease), box-shadow .35s;
}
.num-card::before { /* sweep fill on hover */
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.18), rgba(16, 185, 129, 0.04));
  transform: translateY(101%);
  transition: transform .5s var(--ix-ease);
}
.num-card:hover, .num-card:focus-visible {
  border-color: var(--green, #22C55E);
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}
.num-card:hover::before, .num-card:focus-visible::before { transform: none; }
.num-card-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font: 700 0.75rem/1 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted, #94A3B8);
}
.num-card-num { color: var(--green-bright, #4ADE80); }
.num-card-title {
  font: 700 clamp(1.25rem, 2.4vw, 1.6rem)/1.15 var(--ix-mono);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin: 0;
}
.num-card-text { color: var(--text-secondary, #CBD5E1); font-size: 0.95rem; }
.num-card-cta {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font: 700 0.78rem/1 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-bright, #4ADE80);
}
.num-card-cta .num-card-arrow { display: inline-block; transition: transform .35s var(--ix-ease); }
.num-card:hover .num-card-arrow, .num-card:focus-visible .num-card-arrow { transform: translateX(6px); }
.num-card-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: 0.16;
  transition: opacity .4s, transform .6s var(--ix-ease);
}
.num-card-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.num-card:hover .num-card-media { opacity: 0.28; transform: scale(1.04); }

/* ==========================================================================
   j. BACK TO TOP
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 900;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.65rem 1.05rem;
  border-radius: 50px;
  border: 1px solid var(--border-medium, rgba(34,197,94,.3));
  background: rgba(15, 24, 34, 0.88);
  -webkit-backdrop-filter: blur(12px);
          backdrop-filter: blur(12px);
  color: var(--text-primary, #F1F5F9);
  font: 700 0.72rem/1 var(--ix-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s, transform .3s var(--ix-ease), visibility 0s linear .3s, border-color .25s;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity .3s, transform .3s var(--ix-ease), visibility 0s, border-color .25s;
}
.back-to-top:hover { border-color: var(--green-bright, #4ADE80); }
.back-to-top .back-to-top-arrow { color: var(--green-bright, #4ADE80); font-size: 0.95rem; }

/* ==========================================================================
   k. PHOTO MOSAIC / STRIP + LIGHTBOX
   ========================================================================== */
.photo-mosaic {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: clamp(120px, 16vw, 210px);
  gap: 0.75rem;
}
.photo-mosaic > * { position: relative; overflow: hidden; border-radius: var(--ix-radius-sm); margin: 0; }
.photo-mosaic > *:first-child { grid-column: span 2; grid-row: span 2; }
.photo-mosaic > .is-wide { grid-column: span 2; }
.photo-mosaic > .is-tall { grid-row: span 2; }

.photo-strip {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--green, #22C55E) transparent;
  overscroll-behavior-x: contain;
  max-width: 100%;
  min-width: 0;
  contain: inline-size;
}
.photo-strip > * {
  position: relative;
  flex: 0 0 clamp(220px, 32vw, 340px);
  aspect-ratio: 4 / 3;
  scroll-snap-align: start;
  overflow: hidden;
  border-radius: var(--ix-radius-sm);
  margin: 0;
}

.photo-mosaic img,
.photo-strip img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s var(--ix-ease), filter .4s;
  filter: saturate(0.92);
}
.photo-mosaic > *:hover img,
.photo-strip > *:hover img,
.photo-mosaic a:focus-visible img,
.photo-strip a:focus-visible img { transform: scale(1.07); filter: saturate(1.08); }

.photo-mosaic a, .photo-strip a { display: block; height: 100%; cursor: zoom-in; }
.photo-mosaic > *::after,
.photo-strip > *::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(34, 197, 94, 0.18);
  background: linear-gradient(180deg, transparent 60%, rgba(15, 24, 34, 0.55));
  pointer-events: none;
}
.photo-caption {
  position: absolute;
  left: 0.9rem; right: 0.9rem; bottom: 0.75rem;
  z-index: 1;
  font: 600 0.8rem/1.3 'Inter', sans-serif;
  color: #fff;
  text-shadow: 0 1px 6px rgba(0,0,0,0.6);
  pointer-events: none;
}

@media (max-width: 640px) {
  .photo-mosaic { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 140px; }
  .photo-mosaic > *:first-child { grid-column: span 2; grid-row: span 2; }
  .photo-mosaic > .is-wide { grid-column: span 2; }
  .photo-mosaic > .is-tall { grid-row: span 1; }
  .photo-strip > * { flex-basis: 78%; }
}

/* Lightbox (a <dialog> created by JS) */
.ix-lightbox {
  width: 100vw; height: 100vh;
  max-width: 100vw; max-height: 100vh;
  height: 100dvh; max-height: 100dvh;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-primary, #F1F5F9);
  overflow: hidden;
}
.ix-lightbox::backdrop { background: rgba(8, 13, 20, 0.92); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.ix-lightbox[open] { display: grid; grid-template-rows: 1fr auto; place-items: center; animation: ix-fade-up .35s var(--ix-ease); }
.ix-lightbox-figure {
  margin: 0;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 64px 16px 8px;
  touch-action: pan-y;
}
.ix-lightbox-figure img {
  max-width: min(1200px, 100%);
  max-height: calc(100dvh - 160px);
  width: auto; height: auto;
  border-radius: var(--ix-radius-sm);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
  object-fit: contain;
}
.ix-lightbox-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.75rem 16px max(1rem, env(safe-area-inset-bottom));
  width: 100%;
  max-width: 900px;
}
.ix-lightbox-caption {
  flex: 1;
  text-align: center;
  font-size: 0.92rem;
  color: var(--text-secondary, #CBD5E1);
  min-width: 0;
}
.ix-lightbox-count {
  display: block;
  font: 700 0.72rem/1.4 var(--ix-mono);
  letter-spacing: 0.14em;
  color: var(--green-bright, #4ADE80);
}
.ix-lightbox-close {
  position: absolute;
  top: 12px; right: 12px;
}

/* ==========================================================================
   Reduced motion — everything stays usable, nothing animates
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .spin-cube,
  .flip-card-inner,
  .num-card, .num-card::before, .num-card-media, .num-card-arrow,
  .photo-mosaic img, .photo-strip img,
  .back-to-top,
  .ix-quiz-option { transition: none !important; }
  .marquee-track { animation: none !important; transform: none !important; flex-wrap: wrap; width: 100%; justify-content: center; row-gap: 0.4rem; }
  .marquee { -webkit-mask-image: none; mask-image: none; }
  .marquee-group { flex-wrap: wrap; flex-shrink: 1; width: 100%; justify-content: center; row-gap: 0.4rem; padding: 0 1rem; }
  .marquee-group[aria-hidden="true"], .ix-marquee-toggle { display: none !important; }
  .ix-js [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
  .ix-tabpanel, .ix-quiz [data-result], .ix-lightbox[open] { animation: none !important; }
  /* Flip becomes an instant swap instead of a 3D turn */
  .flip-card.is-flipped .flip-card-inner { transform: none; }
  .flip-card-back { transform: none; visibility: hidden; }
  .flip-card.is-flipped .flip-card-back { visibility: visible; }
  .flip-card.is-flipped .flip-card-front { visibility: hidden; }
  .flip-card:hover:not(.is-flipped) .flip-card-inner { transform: none; }
  .photo-mosaic > *:hover img, .photo-strip > *:hover img { transform: none; }
}