/* ── Demo tab icons ── */
.demo-layout {
  --demo-cycle: 4.5s;
}

.demo-tab-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--text-secondary);
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}

.demo-tab-icon svg { width: 20px; height: 20px; display: block; }

#demo-r0:checked ~ .demo-tabs .demo-tab[data-tab="demo-r0"] .demo-tab-icon,
#demo-r1:checked ~ .demo-tabs .demo-tab[data-tab="demo-r1"] .demo-tab-icon,
#demo-r2:checked ~ .demo-tabs .demo-tab[data-tab="demo-r2"] .demo-tab-icon,
#demo-r3:checked ~ .demo-tabs .demo-tab[data-tab="demo-r3"] .demo-tab-icon,
#demo-r4:checked ~ .demo-tabs .demo-tab[data-tab="demo-r4"] .demo-tab-icon,
#demo-r5:checked ~ .demo-tabs .demo-tab[data-tab="demo-r5"] .demo-tab-icon {
  background: color-mix(in srgb, var(--brand) 14%, var(--bg-elevated));
  border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
  color: var(--brand);
}

/* ── Stage ── */
.demo-panel .demo-stage {
  flex: 1;
  min-height: 340px;
  border-radius: 16px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 100%, color-mix(in srgb, var(--brand) 8%, transparent), transparent),
    linear-gradient(180deg, var(--bg-muted) 0%, color-mix(in srgb, var(--brand) 3%, var(--bg-muted)) 100%);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
}

/* Split / merge / rotate / convert — slightly larger canvas */
.demo-panel-content[data-panel="0"] .demo-stage,
.demo-panel-content[data-panel="1"] .demo-stage,
.demo-panel-content[data-panel="2"] .demo-stage,
.demo-panel-content[data-panel="3"] .demo-stage,
.demo-panel-content[data-panel="4"] .demo-stage {
  min-height: 360px;
}

.fx-canvas {
  position: relative;
  width: 100%;
  max-width: 420px;
  height: 260px;
  display: grid;
  place-items: center;
  box-sizing: border-box;
}

.demo-panel-content[data-panel="0"] .fx-canvas,
.demo-panel-content[data-panel="1"] .fx-canvas,
.demo-panel-content[data-panel="2"] .fx-canvas,
.demo-panel-content[data-panel="3"] .fx-canvas,
.demo-panel-content[data-panel="4"] .fx-canvas {
  width: 100%;
  max-width: 500px;
  height: 310px;
}

/* Loop fade — whole scene in/out each cycle */
@keyframes demoCycleFade {
  0% { opacity: 0; }
  7% { opacity: 1; }
  88% { opacity: 1; }
  100% { opacity: 0; }
}

#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-canvas,
#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-canvas {
  animation: demoCycleFade var(--demo-cycle) ease-in-out infinite;
}

#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-canvas,
#demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-canvas,
#demo-r4:checked ~ .demo-panel [data-panel="4"] .fx-canvas,
#demo-r5:checked ~ .demo-panel [data-panel="5"] .fx-canvas {
  opacity: 1;
}

/* ── Paper document ── */
.fx-pdf {
  background: linear-gradient(165deg, #ffffff 0%, #f6f7f9 55%, #eef0f4 100%);
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-radius: 5px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 2px 4px rgba(0, 0, 0, 0.04),
    0 8px 24px rgba(0, 0, 0, 0.09);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .fx-pdf {
  background: linear-gradient(165deg, #343438 0%, #2a2a2e 55%, #222226 100%);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.06) inset,
    0 8px 24px rgba(0, 0, 0, 0.35);
}

/* dog-ear fold */
.fx-pdf::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 16px;
  height: 16px;
  background: linear-gradient(225deg, color-mix(in srgb, var(--border) 50%, #ccc) 50%, transparent 50%);
  border-bottom-left-radius: 2px;
}

/* PDF badge */
.fx-pdf::after {
  content: "PDF";
  position: absolute;
  top: 10px;
  left: 0;
  padding: 2px 7px 2px 5px;
  font-size: 0.48rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #fff;
  background: linear-gradient(135deg, #ef5350, #d32f2f);
  border-radius: 0 3px 3px 0;
  line-height: 1.3;
}

.fx-pdf-lines {
  padding: 28px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.fx-pdf-lines span {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: color-mix(in srgb, var(--text) 12%, var(--border));
}

.fx-pdf-lines span:nth-child(1) { width: 92%; }
.fx-pdf-lines span:nth-child(2) { width: 78%; }
.fx-pdf-lines span:nth-child(3) { width: 64%; }
.fx-pdf-lines span:nth-child(4) { width: 80%; }

.fx-pdf-tag {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.58rem;
  font-weight: 700;
  color: var(--brand);
  background: color-mix(in srgb, var(--brand) 12%, transparent);
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}

/* ══════════════════════════════════════
   SPLIT — CSS loop (panel 0 active)
   ══════════════════════════════════════ */
.fx-split-single { position: absolute; }
.fx-split-single .fx-pdf { width: 128px; height: 170px; }

.fx-split-stack {
  position: absolute;
  inset: 0;
  perspective: 800px;
  transform-style: preserve-3d;
}

.fx-split-page {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 128px;
  height: 170px;
  margin: -85px 0 0 -64px;
  transform-origin: left center;
  backface-visibility: hidden;
}

.fx-split-page.p1 { z-index: 3; }
.fx-split-page.p2 { z-index: 2; transform: translate(6px, 6px); }
.fx-split-page.p3 { z-index: 1; transform: translate(12px, 12px); opacity: 0.88; }

.fx-split-result {
  position: absolute;
  display: flex;
  gap: 18px;
  opacity: 0;
}

.fx-split-part {
  width: 76px;
  height: 102px;
  display: grid;
  place-items: center;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--brand);
}

#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-page.p1 {
  animation: splitFlip1 var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-page.p2 {
  animation: splitFlip2 var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-page.p3 {
  animation: splitFlip3 var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-single {
  animation: splitHideStack var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-result {
  animation: splitShowResult var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-part:nth-child(1) {
  animation: splitPop var(--demo-cycle) ease-in-out infinite;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-part:nth-child(2) {
  animation: splitPop var(--demo-cycle) ease-in-out infinite 0.1s;
}
#demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-part:nth-child(3) {
  animation: splitPop var(--demo-cycle) ease-in-out infinite 0.2s;
}

@keyframes splitFlip1 {
  0%, 18% { transform: translate(0, 0) rotateY(0); opacity: 1; }
  24%, 30% { transform: rotateY(-130deg); opacity: 0; }
  31%, 100% { transform: rotateY(-130deg); opacity: 0; }
}
@keyframes splitFlip2 {
  0%, 28% { transform: translate(5px, 5px) rotateY(0); opacity: 1; }
  34%, 40% { transform: translate(5px, 5px) rotateY(-130deg); opacity: 0; }
  41%, 100% { transform: translate(5px, 5px) rotateY(-130deg); opacity: 0; }
}
@keyframes splitFlip3 {
  0%, 38% { transform: translate(10px, 10px) rotateY(0); opacity: 0.88; }
  44%, 50% { transform: translate(10px, 10px) rotateY(-130deg); opacity: 0; }
  51%, 100% { transform: translate(10px, 10px) rotateY(-130deg); opacity: 0; }
}
@keyframes splitHideStack {
  0%, 48% { opacity: 1; transform: scale(1); }
  55%, 84% { opacity: 0; transform: scale(0.9); }
  88%, 100% { opacity: 0; transform: scale(0.95); }
}
@keyframes splitShowResult {
  0%, 50% { opacity: 0; transform: translateY(10px); }
  58%, 82% { opacity: 1; transform: translateY(0); }
  88%, 100% { opacity: 0; transform: translateY(10px); }
}
@keyframes splitPop {
  0%, 54% { opacity: 0; transform: scale(0.7) translateY(12px); }
  62%, 82% { opacity: 1; transform: scale(1) translateY(0); }
  88%, 100% { opacity: 0; transform: scale(0.7) translateY(12px); }
}

/* ══════════════════════════════════════
   MERGE
   ══════════════════════════════════════ */
.fx-merge-parts {
  position: absolute;
  display: flex;
  gap: 22px;
}

.fx-merge-part {
  width: 74px;
  height: 100px;
  display: grid;
  place-content: center;
  font-weight: 800;
  font-size: 0.92rem;
}
.fx-merge-part.a { color: #3b82f6; }
.fx-merge-part.b { color: #8b5cf6; }
.fx-merge-part.c { color: #ec4899; }

.fx-merge-result {
  position: absolute;
  opacity: 0;
  transform: scale(0.55);
}
.fx-merge-result .fx-pdf { width: 140px; height: 180px; }

#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-part {
  opacity: 0;
  transform: translateX(-56px) scale(0.9);
}

#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-part.a {
  animation: mergeMoveA var(--demo-cycle) ease-in-out infinite;
}
#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-part.b {
  animation: mergeMoveB var(--demo-cycle) ease-in-out infinite;
}
#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-part.c {
  animation: mergeMoveC var(--demo-cycle) ease-in-out infinite;
}
#demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-result {
  animation: mergeShow var(--demo-cycle) ease-in-out infinite;
}

@keyframes mergeMoveA {
  0%, 2% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  2%, 10% { opacity: 1; transform: translate(0, 0) scale(1); }
  10%, 22% { opacity: 1; transform: translate(0, 0) scale(1); }
  22%, 42% { transform: translate(28px, 8px) scale(0.82); opacity: 0.55; }
  42%, 48% { opacity: 0; transform: translate(28px, 8px) scale(0.75); }
  48%, 88% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  88%, 100% { opacity: 0; transform: translateX(-56px) scale(0.9); }
}
@keyframes mergeMoveB {
  0%, 7% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  7%, 15% { opacity: 1; transform: translate(0, 0) scale(1); }
  15%, 22% { opacity: 1; transform: translate(0, 0) scale(1); }
  22%, 42% { transform: translate(0, 0) scale(0.88); opacity: 0.75; }
  42%, 48% { opacity: 0; transform: translate(0, 0) scale(0.75); }
  48%, 88% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  88%, 100% { opacity: 0; transform: translateX(-56px) scale(0.9); }
}
@keyframes mergeMoveC {
  0%, 12% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  12%, 20% { opacity: 1; transform: translate(0, 0) scale(1); }
  20%, 22% { opacity: 1; transform: translate(0, 0) scale(1); }
  22%, 42% { transform: translate(-28px, 8px) scale(0.82); opacity: 0.55; }
  42%, 48% { opacity: 0; transform: translate(-28px, 8px) scale(0.75); }
  48%, 88% { opacity: 0; transform: translateX(-56px) scale(0.9); }
  88%, 100% { opacity: 0; transform: translateX(-56px) scale(0.9); }
}
@keyframes mergeShow {
  0%, 48% { opacity: 0; transform: scale(0.55); }
  58%, 82% { opacity: 1; transform: scale(1); }
  88%, 100% { opacity: 0; transform: scale(0.55); }
}

/* ══════════════════════════════════════
   ROTATE
   ══════════════════════════════════════ */
.fx-rotate-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.fx-rotate-doc {
  width: 102px;
  height: 136px;
}
.fx-rotate-doc .fx-pdf { width: 100%; height: 100%; }
.fx-rotate-doc .fx-pdf-lines span:first-child {
  background: color-mix(in srgb, var(--brand) 40%, var(--border));
}

.fx-rotate-degs { display: flex; gap: 8px; }

.fx-deg {
  min-width: 46px;
  padding: 6px 10px;
  text-align: center;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-tertiary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-rotate-doc {
  animation: rotateDoc var(--demo-cycle) ease-in-out infinite;
}
#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-deg:nth-child(1) {
  animation: degActive var(--demo-cycle) step-end infinite;
}
#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-deg:nth-child(2) {
  animation: degActive2 var(--demo-cycle) step-end infinite;
}
#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-deg:nth-child(3) {
  animation: degActive3 var(--demo-cycle) step-end infinite;
}
#demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-deg:nth-child(4) {
  animation: degActive4 var(--demo-cycle) step-end infinite;
}

@keyframes rotateDoc {
  0%, 20% { transform: rotate(0deg); }
  25%, 45% { transform: rotate(90deg); }
  50%, 70% { transform: rotate(180deg); }
  75%, 95% { transform: rotate(270deg); }
  100% { transform: rotate(360deg); }
}
@keyframes degActive {
  0%, 24% { color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, var(--bg-elevated)); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); }
  25%, 100% { color: var(--text-tertiary); background: var(--bg-elevated); border-color: var(--border); }
}
@keyframes degActive2 {
  0%, 24% { color: var(--text-tertiary); }
  25%, 49% { color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, var(--bg-elevated)); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); }
  50%, 100% { color: var(--text-tertiary); background: var(--bg-elevated); border-color: var(--border); }
}
@keyframes degActive3 {
  0%, 49% { color: var(--text-tertiary); }
  50%, 74% { color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, var(--bg-elevated)); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); }
  75%, 100% { color: var(--text-tertiary); background: var(--bg-elevated); border-color: var(--border); }
}
@keyframes degActive4 {
  0%, 74% { color: var(--text-tertiary); }
  75%, 99% { color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, var(--bg-elevated)); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); }
  100% { color: var(--text-tertiary); background: var(--bg-elevated); border-color: var(--border); }
}

/* ══════════════════════════════════════
   CONVERT
   ══════════════════════════════════════ */
.fx-convert-row {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  opacity: 0;
  pointer-events: none;
}

.fx-fmt {
  width: 86px;
  height: 110px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-weight: 800;
  font-size: 0.95rem;
  color: #fff;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}
.fx-fmt small { font-size: 0.62rem; font-weight: 600; opacity: 0.9; }
.fx-fmt-word { background: linear-gradient(145deg, #2563eb, #1d4ed8); }
.fx-fmt-pdf  { background: linear-gradient(145deg, #ef4444, #dc2626); }
.fx-fmt-png  { background: linear-gradient(145deg, #8b5cf6, #7c3aed); }

.fx-convert-arrow {
  display: flex;
  align-items: center;
  width: 72px;
  flex-shrink: 0;
}
.fx-convert-track {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}
.fx-convert-track span {
  position: absolute;
  left: -30%;
  top: 0;
  width: 30%;
  height: 100%;
  background: var(--brand);
  border-radius: 2px;
}

#demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-row-doc-pdf {
  animation: convertRowA var(--demo-cycle) linear infinite;
}
#demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-row-pdf-png {
  animation: convertRowB var(--demo-cycle) linear infinite;
}
#demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-row-doc-pdf .fx-convert-track span {
  animation: convertTrackA var(--demo-cycle) linear infinite;
}
#demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-row-pdf-png .fx-convert-track span {
  animation: convertTrackB var(--demo-cycle) linear infinite;
}

/* A then B, short handoff only — always one scene on screen */
@keyframes convertRowA {
  0%, 46% { opacity: 1; }
  50%, 96% { opacity: 0; }
  100% { opacity: 1; }
}
@keyframes convertRowB {
  0%, 46% { opacity: 0; }
  50%, 96% { opacity: 1; }
  100% { opacity: 0; }
}
@keyframes convertTrackA {
  0% { left: -30%; }
  8%, 42% { left: 100%; }
  46%, 100% { left: -30%; }
}
@keyframes convertTrackB {
  0%, 50% { left: -30%; }
  58%, 90% { left: 100%; }
  96%, 100% { left: -30%; }
}

/* ══════════════════════════════════════
   COMPRESS
   ══════════════════════════════════════ */
.fx-compress-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}

.fx-compress-pdf {
  width: 172px;
  height: 138px;
  transform-origin: center center;
}
.fx-compress-pdf .fx-pdf { width: 100%; height: 100%; }

.fx-compress-sizes {
  display: flex;
  align-items: center;
  gap: 16px;
  font-weight: 800;
  font-size: 1.08rem;
}
.fx-compress-sizes .before { color: var(--text-secondary); }
.fx-compress-sizes .after { color: var(--brand); opacity: 0; }
.fx-compress-sizes .arrow { color: var(--text-tertiary); font-size: 0.95rem; }

#demo-r4:checked ~ .demo-panel [data-panel="4"] .fx-compress-pdf {
  animation: compressSlim var(--demo-cycle) ease-in-out infinite;
}
#demo-r4:checked ~ .demo-panel [data-panel="4"] .fx-compress-sizes .before {
  animation: compressBefore var(--demo-cycle) ease-in-out infinite;
}
#demo-r4:checked ~ .demo-panel [data-panel="4"] .fx-compress-sizes .after {
  animation: compressAfter var(--demo-cycle) ease-in-out infinite;
}

@keyframes compressSlim {
  0%, 20% { transform: scaleX(1); }
  35%, 65% { transform: scaleX(0.55); box-shadow: 0 4px 16px rgba(138, 92, 245, 0.2); }
  78%, 100% { transform: scaleX(1); }
}
@keyframes compressBefore {
  0%, 30% { opacity: 1; text-decoration: none; }
  40%, 70% { opacity: 0.35; text-decoration: line-through; }
  78%, 100% { opacity: 1; text-decoration: none; }
}
@keyframes compressAfter {
  0%, 35% { opacity: 0; transform: scale(0.8); }
  45%, 68% { opacity: 1; transform: scale(1); }
  78%, 100% { opacity: 0; transform: scale(0.8); }
}

/* ══════════════════════════════════════
   WATERMARK
   ══════════════════════════════════════ */
.fx-watermark-pdf {
  width: 140px;
  height: 178px;
  position: relative;
}
.fx-watermark-pdf .fx-pdf { width: 100%; height: 100%; }

.fx-watermark-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: color-mix(in srgb, var(--brand) 50%, transparent);
  transform: rotate(-30deg);
  clip-path: inset(0 100% 0 0);
}

.fx-watermark-shine {
  position: absolute;
  top: -20%;
  left: -80%;
  width: 40%;
  height: 140%;
  background: linear-gradient(105deg, transparent 35%, rgba(255, 255, 255, 0.7) 50%, transparent 65%);
  transform: skewX(-18deg);
  opacity: 0;
  pointer-events: none;
}

#demo-r5:checked ~ .demo-panel [data-panel="5"] .fx-watermark-label {
  animation: wmReveal var(--demo-cycle) ease-in-out infinite;
}
#demo-r5:checked ~ .demo-panel [data-panel="5"] .fx-watermark-shine {
  animation: wmShine var(--demo-cycle) ease-in-out infinite;
}

@keyframes wmReveal {
  0%, 15% { clip-path: inset(0 100% 0 0); }
  30%, 72% { clip-path: inset(0 0 0 0); }
  82%, 100% { clip-path: inset(0 100% 0 0); }
}
@keyframes wmShine {
  0%, 20% { left: -80%; opacity: 0; }
  25% { opacity: 1; }
  40%, 100% { left: 130%; opacity: 0; }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  #demo-r0:checked ~ .demo-panel [data-panel="0"] *,
  #demo-r1:checked ~ .demo-panel [data-panel="1"] *,
  #demo-r2:checked ~ .demo-panel [data-panel="2"] *,
  #demo-r3:checked ~ .demo-panel [data-panel="3"] *,
  #demo-r4:checked ~ .demo-panel [data-panel="4"] *,
  #demo-r5:checked ~ .demo-panel [data-panel="5"] * {
    animation: none !important;
  }
  #demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-canvas,
  #demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-canvas {
    animation: none !important;
    opacity: 1;
  }
  #demo-r2:checked ~ .demo-panel [data-panel="2"] .fx-canvas,
  #demo-r3:checked ~ .demo-panel [data-panel="3"] .fx-canvas,
  #demo-r4:checked ~ .demo-panel [data-panel="4"] .fx-canvas,
  #demo-r5:checked ~ .demo-panel [data-panel="5"] .fx-canvas {
    opacity: 1;
  }
  #demo-r0:checked ~ .demo-panel [data-panel="0"] .fx-split-result { opacity: 1; }
  #demo-r1:checked ~ .demo-panel [data-panel="1"] .fx-merge-result { opacity: 1; transform: scale(1); }
  #demo-r5:checked ~ .demo-panel [data-panel="5"] .fx-watermark-label { clip-path: inset(0 0 0 0); }
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .demo-panel .demo-stage { min-height: 200px; }
  .demo-panel-content[data-panel="0"] .demo-stage,
  .demo-panel-content[data-panel="1"] .demo-stage,
  .demo-panel-content[data-panel="2"] .demo-stage,
  .demo-panel-content[data-panel="3"] .demo-stage,
  .demo-panel-content[data-panel="4"] .demo-stage,
  .demo-panel-content[data-panel="5"] .demo-stage {
    min-height: 200px;
  }
  .fx-canvas {
    width: 100%;
    max-width: 300px;
    height: 180px;
  }
  .demo-panel-content[data-panel="0"] .fx-canvas,
  .demo-panel-content[data-panel="1"] .fx-canvas,
  .demo-panel-content[data-panel="2"] .fx-canvas,
  .demo-panel-content[data-panel="3"] .fx-canvas,
  .demo-panel-content[data-panel="4"] .fx-canvas,
  .demo-panel-content[data-panel="5"] .fx-canvas {
    width: 100%;
    max-width: 300px;
    height: 180px;
  }

  .fx-split-single .fx-pdf,
  .fx-split-page {
    width: 88px;
    height: 118px;
    margin: -59px 0 0 -44px;
  }
  .fx-split-result { gap: 8px; }
  .fx-split-part { width: 48px; height: 64px; font-size: 0.72rem; }

  .fx-merge-parts { gap: 10px; }
  .fx-merge-part { width: 48px; height: 66px; font-size: 0.78rem; }
  .fx-merge-result .fx-pdf { width: 96px; height: 124px; }

  .fx-rotate-wrap { gap: 14px; }
  .fx-rotate-doc { width: 68px; height: 90px; }
  .fx-deg { min-width: 36px; padding: 4px 7px; font-size: 0.7rem; }

  .fx-fmt { width: 52px; height: 68px; font-size: 0.72rem; border-radius: 8px; }
  .fx-fmt small { font-size: 0.5rem; }
  .fx-convert-row { gap: 10px; }
  .fx-convert-arrow { width: 44px; }

  .fx-compress-wrap { gap: 12px; }
  .fx-compress-pdf { width: 110px; height: 88px; }
  .fx-compress-sizes { font-size: 0.88rem; gap: 8px; }
  .fx-compress-sizes .arrow { font-size: 0.8rem; }

  .fx-watermark-pdf { width: 96px; height: 122px; }
  .fx-watermark-label { font-size: 0.52rem; }
}

@media (max-width: 480px) {
  .demo-panel .demo-stage { min-height: 170px; }
  .demo-panel-content[data-panel="0"] .demo-stage,
  .demo-panel-content[data-panel="1"] .demo-stage,
  .demo-panel-content[data-panel="2"] .demo-stage,
  .demo-panel-content[data-panel="3"] .demo-stage,
  .demo-panel-content[data-panel="4"] .demo-stage,
  .demo-panel-content[data-panel="5"] .demo-stage {
    min-height: 170px;
  }
  .fx-canvas,
  .demo-panel-content[data-panel="0"] .fx-canvas,
  .demo-panel-content[data-panel="1"] .fx-canvas,
  .demo-panel-content[data-panel="2"] .fx-canvas,
  .demo-panel-content[data-panel="3"] .fx-canvas,
  .demo-panel-content[data-panel="4"] .fx-canvas,
  .demo-panel-content[data-panel="5"] .fx-canvas {
    width: 100%;
    max-width: 260px;
    height: 155px;
  }

  .fx-split-single .fx-pdf,
  .fx-split-page {
    width: 72px;
    height: 96px;
    margin: -48px 0 0 -36px;
  }
  .fx-split-part { width: 40px; height: 54px; font-size: 0.64rem; }
  .fx-merge-part { width: 40px; height: 54px; font-size: 0.7rem; }
  .fx-merge-result .fx-pdf { width: 80px; height: 104px; }
  .fx-rotate-doc { width: 56px; height: 76px; }
  .fx-fmt { width: 44px; height: 58px; font-size: 0.64rem; }
  .fx-convert-arrow { width: 36px; }
  .fx-compress-pdf { width: 92px; height: 74px; }
  .fx-compress-sizes { font-size: 0.78rem; }
  .fx-watermark-pdf { width: 80px; height: 104px; }
  .fx-watermark-label { font-size: 0.44rem; letter-spacing: 0.06em; }
}