:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #08090d;
  color: #f4f5f7;
  font-synthesis: none;
  --page-bg: #08090d;
  --page-image: none;
  --page-overlay: radial-gradient(circle at 12% 0%, rgba(93, 104, 255, 0.17), transparent 32rem), radial-gradient(circle at 95% 90%, rgba(0, 220, 190, 0.09), transparent 26rem);
  --page-shadow: rgba(0, 0, 0, 0.32);
  --surface: rgba(16, 19, 27, 0.9);
  --surface-soft: rgba(255, 255, 255, 0.045);
  --surface-border: rgba(255, 255, 255, 0.1);
  --text: #f4f5f7;
  --text-muted: #8992a6;
  --text-subtle: #69748a;
  --accent: #ffffff;
  --accent-2: #73f7d2;
  --accent-warm: #ffd99d;
  --active-text: #0b0d12;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.5rem;
}

html[data-theme="fun-mask"] {
  --page-bg: #101a2a;
  --page-image: url("./assets/themes/fun-mask-cartoon.png");
  --page-overlay: linear-gradient(180deg, rgba(16, 26, 42, 0.34), rgba(8, 10, 16, 0.76));
  --surface: rgba(13, 21, 34, 0.88);
  --surface-soft: rgba(15, 25, 40, 0.78);
  --surface-border: rgba(130, 224, 255, 0.24);
  --accent: #ffd36a;
  --accent-2: #73f7d2;
  --accent-warm: #ff9b84;
}

html[data-theme="face-change"] {
  --page-bg: #160a09;
  --page-image: url("./assets/themes/face-change-opera.png");
  --page-overlay: linear-gradient(180deg, rgba(30, 7, 5, 0.28), rgba(8, 5, 5, 0.82));
  --surface: rgba(20, 10, 9, 0.9);
  --surface-soft: rgba(35, 14, 11, 0.76);
  --surface-border: rgba(232, 182, 108, 0.3);
  --accent: #e8b66c;
  --accent-2: #ef6854;
  --accent-warm: #ffd99d;
  --active-text: #211008;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--page-bg);
}

body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--page-overlay), var(--page-image), var(--page-bg);
  background-position: center, center, center;
  background-size: auto, cover, auto;
  background-attachment: fixed;
  font-size: 1rem;
}

button, a { font: inherit; }

button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 0.125rem solid var(--accent-2);
  outline-offset: 0.1875rem;
}

.app-shell {
  width: min(90rem, calc(100% - clamp(1.25rem, 4vw, 2rem)));
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2rem) 0 1.375rem;
}

.topbar, .controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 2vw, 1.25rem);
}

.topbar { margin-bottom: clamp(1rem, 2.5vw, 1.5rem); }

.eyebrow, .section-label {
  margin: 0 0 0.4375rem;
  color: var(--text-muted);
  font-size: clamp(0.625rem, 1vw, 0.6875rem);
  font-weight: 800;
  letter-spacing: 0.18em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: clamp(0.5rem, 1.5vw, 0.75rem);
}

.locale-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.125rem;
  padding: 0.1875rem;
  border: 0.0625rem solid var(--surface-border);
  border-radius: 999rem;
  background: var(--surface-soft);
}

.locale-button {
  display: inline-grid;
  min-width: 2.125rem;
  min-height: 1.875rem;
  place-items: center;
  border: 0;
  border-radius: 999rem;
  padding: 0 0.4375rem;
  color: var(--text-muted);
  background: transparent;
  font-size: clamp(0.625rem, 1.5vw, 0.75rem);
  font-weight: 800;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.locale-button:hover { color: var(--text); transform: translateY(-0.0625rem); }
.locale-button.active { color: var(--active-text); background: var(--accent-2); }

.sr-only {
  position: absolute;
  width: 0.0625rem;
  height: 0.0625rem;
  padding: 0;
  margin: -0.0625rem;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.75rem, 4vw, 2.875rem);
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.brand-english { margin-left: 0.5rem; color: var(--accent-2); font-size: 0.44em; letter-spacing: 0.02em; vertical-align: 0.2em; }
html[data-locale="en"] .brand-english { display: none; }

.help-button {
  display: inline-grid;
  width: clamp(2.25rem, 5vw, 2.75rem);
  aspect-ratio: 1;
  place-items: center;
  border: 0.0625rem solid color-mix(in srgb, var(--accent-2) 58%, transparent);
  border-radius: 50%;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 10%, transparent);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 900;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.help-button:hover { color: var(--active-text); background: var(--accent-2); transform: translateY(-0.0625rem); }

.fullscreen-button {
  display: inline-flex;
  min-height: 2.25rem;
  align-items: center;
  gap: 0.4375rem;
  border: 0.0625rem solid var(--surface-border);
  border-radius: 999rem;
  padding: 0.375rem 0.75rem;
  color: var(--accent-2);
  background: var(--surface-soft);
  font-size: clamp(0.6875rem, 1.4vw, 0.8125rem);
  font-weight: 800;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.fullscreen-button:hover { color: var(--text); border-color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); transform: translateY(-0.0625rem); }
.fullscreen-icon { position: relative; display: inline-block; width: 0.875rem; height: 0.875rem; border: 0.1rem solid currentColor; border-radius: 0.125rem; }
.fullscreen-icon::after { position: absolute; inset: 0.16rem; border: 0.0625rem solid currentColor; border-radius: 0.0625rem; opacity: 0.35; content: ""; }

.stage-card {
  position: relative;
  display: grid;
  width: 100%;
  aspect-ratio: var(--stage-ratio, 16 / 9);
  min-height: 0;
  overflow: hidden;
  place-items: center;
  border: 0;
  border-radius: clamp(1rem, 2vw, 1.5rem);
  background: var(--surface);
  box-shadow: 0 1.5rem 5.625rem var(--page-shadow);
}

.stage-card::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  border: 0.0625rem solid rgba(255, 255, 255, 0.05);
  border-radius: inherit;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  object-fit: fill;
}

.stage-card > canvas { grid-area: 1 / 1; }
#canvas { z-index: 2; }
#face-canvas {
  z-index: 1;
  display: block;
  opacity: 0;
  pointer-events: none;
}
#face-canvas.visible { opacity: 1; }

video { display: none; }

.stage-status {
  position: absolute;
  z-index: 2;
  display: grid;
  max-width: 22.5rem;
  place-items: center;
  gap: 0.625rem;
  padding: clamp(1.25rem, 4vw, 1.75rem);
  color: var(--text);
  text-align: center;
  pointer-events: none;
}

.stage-status p { margin: 0; color: #aab3c5; font-size: clamp(0.75rem, 1.5vw, 0.8125rem); line-height: 1.5; }
.stage-status.error { pointer-events: auto; }
.stage-status.error .spinner { display: none; }
.stage-status.hidden { display: none; }
.stage-status.loading {
  min-width: min(21rem, calc(100% - 2rem));
  border: 0.0625rem solid color-mix(in srgb, var(--accent-2) 34%, var(--surface-border));
  border-radius: clamp(1rem, 3vw, 1.25rem);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(0.875rem);
}

.loading-meter {
  display: grid;
  width: min(18rem, 100%);
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.625rem;
}

.loading-progress {
  display: block;
  width: 100%;
  height: 0.375rem;
  overflow: hidden;
  border-radius: 999rem;
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

.loading-progress > span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-2), var(--accent-warm));
  box-shadow: 0 0 1rem color-mix(in srgb, var(--accent-2) 52%, transparent);
  transition: width 0.3s ease;
}

.loading-progress-value {
  min-width: 2.5rem;
  color: var(--accent-2);
  font-size: clamp(0.6875rem, 1.5vw, 0.75rem);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  text-align: right;
}

.spinner {
  width: 1.625rem;
  height: 1.625rem;
  border: 0.125rem solid rgba(255, 255, 255, 0.18);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.effect-toast {
  position: absolute;
  top: 1.125rem;
  left: 50%;
  z-index: 3;
  max-width: calc(100% - 2rem);
  padding: 0.5625rem 0.875rem;
  border: 0.0625rem solid var(--surface-border);
  border-radius: 999rem;
  color: var(--text);
  background: rgba(12, 14, 20, 0.76);
  font-size: clamp(0.6875rem, 1.5vw, 0.75rem);
  font-weight: 800;
  opacity: 0;
  transform: translate(-50%, -0.5rem);
  pointer-events: none;
  backdrop-filter: blur(0.875rem);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.effect-toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.capture-countdown {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 4;
  display: grid;
  width: clamp(5.5rem, 14vw, 7rem);
  height: clamp(5.5rem, 14vw, 7rem);
  place-items: center;
  border: 0.125rem solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
  color: var(--text);
  background: rgba(8, 9, 13, 0.48);
  box-shadow: 0 0 3.125rem color-mix(in srgb, var(--accent-2) 35%, transparent);
  font-size: clamp(2.75rem, 7vw, 3.625rem);
  font-weight: 900;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.8);
  backdrop-filter: blur(0.625rem);
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.capture-countdown.visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.help-dialog {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: clamp(1rem, 4vw, 2rem);
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.18s ease, visibility 0.18s ease;
}

.help-dialog.open { visibility: visible; opacity: 1; }
.help-dialog-scrim { position: absolute; inset: 0; width: 100%; border: 0; background: rgba(3, 5, 10, 0.74); cursor: default; }
.help-dialog-panel { position: relative; display: grid; width: min(100%, 42rem); max-height: min(90vh, 48rem); gap: clamp(0.875rem, 2vw, 1.25rem); overflow: auto; padding: clamp(1rem, 3vw, 1.5rem); border: 0.0625rem solid var(--surface-border); border-radius: clamp(1rem, 3vw, 1.5rem); background: var(--surface); box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, 0.42); transform: translateY(0.5rem); transition: transform 0.18s ease; }
.help-dialog.open .help-dialog-panel { transform: translateY(0); }
.help-dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.help-dialog-header h2 { margin: 0; color: var(--text); font-size: clamp(1.125rem, 3vw, 1.5rem); letter-spacing: -0.03em; }
.help-close-button { display: inline-grid; width: 2rem; height: 2rem; place-items: center; border: 0.0625rem solid var(--surface-border); border-radius: 50%; color: var(--text-muted); background: var(--surface-soft); font-size: 1.25rem; line-height: 1; cursor: pointer; }
.help-close-button:hover { color: var(--text); border-color: var(--accent-2); }
.help-image { display: block; width: 100%; height: auto; border-radius: var(--radius-md); }
.help-steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(0.625rem, 2vw, 1rem); }
.help-step { display: grid; grid-template-columns: auto 1fr; align-items: start; gap: 0.625rem; padding: clamp(0.75rem, 2vw, 1rem); border: 0.0625rem solid var(--surface-border); border-radius: var(--radius-md); background: var(--surface-soft); }
.help-step-number { display: inline-grid; width: 1.625rem; height: 1.625rem; place-items: center; border-radius: 50%; color: var(--active-text); background: var(--accent-2); font-size: 0.75rem; font-weight: 900; }
.help-step strong { display: block; margin-bottom: 0.25rem; color: var(--text); font-size: clamp(0.8125rem, 1.8vw, 0.9375rem); }
.help-step p { margin: 0; color: var(--text-muted); font-size: clamp(0.6875rem, 1.5vw, 0.8125rem); line-height: 1.45; }
.help-start-button { justify-self: end; min-height: 2.5rem; border: 0.0625rem solid var(--accent-2); border-radius: 999rem; padding: 0.5rem 1.125rem; color: var(--active-text); background: var(--accent-2); font-size: clamp(0.75rem, 1.5vw, 0.875rem); font-weight: 800; cursor: pointer; }

.controls {
  align-items: flex-end;
  padding: 1.375rem 0.125rem 0.75rem;
}

.effect-picker { flex: 1 1 45rem; min-width: 0; }
.toolbar { display: grid; gap: 0.75rem; }
.effect-group { display: grid; gap: 0.4375rem; }
.effect-group-heading { display: flex; align-items: baseline; gap: 0.5rem; }
.effect-group-heading h2 { margin: 0; color: var(--text); font-size: clamp(1rem, 1.6vw, 1.125rem); font-weight: 800; letter-spacing: -0.02em; }
.effect-group-heading span { color: var(--text-subtle); font-size: clamp(0.625rem, 1vw, 0.6875rem); }
.effect-group-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.gesture-settings {
  display: grid;
  grid-template-columns: minmax(11.25rem, 1fr) auto;
  align-items: center;
  gap: 0.625rem clamp(0.75rem, 2vw, 1.125rem);
  margin-top: 1.125rem;
  padding-top: 0.875rem;
  border-top: 0.0625rem solid var(--surface-border);
}

.gesture-settings-heading { min-width: 0; }
.gesture-settings-heading .section-label { margin-bottom: 0.1875rem; }
.control-note { margin: 0; color: var(--text-subtle); font-size: clamp(0.6875rem, 1.3vw, 0.75rem); }
.toggle-control, .category-toggle { display: inline-flex; align-items: center; gap: 0.4375rem; color: #c9d0de; font-size: clamp(0.6875rem, 1.3vw, 0.75rem); cursor: pointer; }
.toggle-control { justify-self: end; font-weight: 800; }
.toggle-control input, .category-toggle input { accent-color: var(--accent-2); }
.pinch-category-controls { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.category-toggle { padding: 0.4375rem 0.5625rem; border: 0.0625rem solid var(--surface-border); border-radius: var(--radius-sm); background: var(--surface-soft); }
.category-toggle:has(input:checked) { border-color: color-mix(in srgb, var(--accent-2) 42%, transparent); color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 10%, transparent); }

.effect-button, .secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(2.25rem, 5vw, 2.75rem);
  border: 0.0625rem solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 0 clamp(0.75rem, 2vw, 1rem);
  color: #bac2d3;
  background: var(--surface-soft);
  text-decoration: none;
  font-size: clamp(0.75rem, 1.5vw, 0.875rem);
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.effect-button:hover, .secondary-button:hover { border-color: color-mix(in srgb, var(--accent) 45%, transparent); color: var(--text); background: color-mix(in srgb, var(--accent) 9%, transparent); transform: translateY(-0.0625rem); }
.effect-button:disabled, .secondary-button:disabled { cursor: wait; opacity: 0.55; }
.effect-button.active { border-color: var(--accent); color: var(--active-text); background: var(--accent); }
.effect-button[data-effect="werewolf"],
.effect-button[data-effect="tiger"],
.effect-button[data-effect="dog"],
.effect-button[data-effect="anonymous"] {
  border-color: color-mix(in srgb, var(--accent-2) 34%, transparent);
  color: var(--accent-2);
}
.effect-button[data-effect="werewolf"]:hover,
.effect-button[data-effect="tiger"]:hover,
.effect-button[data-effect="dog"]:hover,
.effect-button[data-effect="anonymous"]:hover {
  border-color: var(--accent-2);
  color: var(--text);
  background: color-mix(in srgb, var(--accent-2) 20%, transparent);
}
.effect-button[data-effect="werewolf"].active,
.effect-button[data-effect="tiger"].active,
.effect-button[data-effect="dog"].active,
.effect-button[data-effect="anonymous"].active {
  border-color: var(--accent-2);
  color: #071411;
  background: linear-gradient(110deg, var(--accent-2), #b5f5ff);
}

html[data-theme="face-change"] .effect-button[data-effect="pekingOpera"],
html[data-theme="face-change"] .effect-button[data-effect="nuoOpera"],
html[data-theme="face-change"] .effect-button[data-effect="yellowOpera"] {
  border-color: color-mix(in srgb, var(--accent) 36%, transparent);
  color: var(--accent-warm);
}

html[data-theme="face-change"] .effect-button[data-effect="pekingOpera"].active,
html[data-theme="face-change"] .effect-button[data-effect="nuoOpera"].active,
html[data-theme="face-change"] .effect-button[data-effect="yellowOpera"].active {
  border-color: var(--accent);
  color: var(--active-text);
  background: linear-gradient(110deg, var(--accent), var(--accent-2));
}

.key { margin-right: 0.375rem; opacity: 0.55; font-size: 0.625rem; }
.control-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; width: fit-content; max-width: 100%; padding-top: 0; border-top: 0; align-self: start; }
.stage-actions { grid-area: stage-actions; justify-self: start; width: fit-content; max-width: 100%; max-height: clamp(2.75rem, 6vw, 3.5rem); }
.stage-actions > * { flex: 0 1 clamp(8.75rem, 16vw, 11rem); width: clamp(8.75rem, 16vw, 11rem); max-width: 11rem; min-height: clamp(2.5rem, 5vw, 2.875rem); max-height: 3.5rem; }
.capture-button { border-color: color-mix(in srgb, var(--accent-warm) 38%, transparent); color: var(--accent-warm); }
.hidden { display: none !important; }

@media (min-width: 56rem) {
  html, body { height: 100%; }
  body { overflow: hidden; }

  .app-shell {
    display: grid;
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    grid-template-columns: minmax(0, 1fr) clamp(17rem, 25vw, 23rem);
    grid-template-rows: auto auto minmax(0, 1fr);
    grid-template-areas:
      "topbar topbar"
      "stage controls"
      "stage-actions controls";
    align-items: start;
    column-gap: clamp(1rem, 2.5vw, 2rem);
    row-gap: clamp(1rem, 2.5vw, 1.5rem);
  }

  .topbar { grid-area: topbar; margin-bottom: 0; }
  .stage-card { grid-area: stage; align-self: start; }
  .stage-actions { grid-area: stage-actions; }
  .controls {
    grid-area: controls;
    align-items: stretch;
    flex-direction: column;
    min-height: 0;
    height: 100%;
    overflow-x: hidden;
    overflow-y: hidden;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
    padding: 0;
  }
  .effect-picker { display: flex; width: 100%; min-height: 0; flex: 1 1 auto; flex-direction: column; overflow-x: hidden; overflow-y: auto; overscroll-behavior: contain; padding-bottom: 0.25rem; }
  .control-actions {
    flex-shrink: 0;
  }
  .control-actions > * { min-width: 0; }
  .gesture-settings { grid-template-columns: 1fr; align-items: start; }
  .toggle-control { justify-self: start; }
}

@media (max-width: 43.75rem) {
  html, body { height: auto; }
  body { overflow-x: hidden; overflow-y: auto; }
  .app-shell { width: min(100% - 1.25rem, 90rem); padding-top: clamp(1.25rem, 4vw, 1.5rem); }
  .app-shell { height: auto; max-height: none; overflow: visible; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .topbar-actions { width: 100%; justify-content: space-between; }
  .stage-card { border-radius: clamp(1rem, 4vw, 1.125rem); }
  .stage-actions {
    width: calc(100% - clamp(1rem, 4vw, 1.5rem));
    max-width: calc(100% - clamp(1rem, 4vw, 1.5rem));
    margin-inline: clamp(0.5rem, 2vw, 0.75rem);
  }
  .stage-actions > * {
    flex: 1 1 0;
    width: auto;
    max-width: 11rem;
  }
  .controls { align-items: stretch; flex-direction: column; height: auto; max-height: none; overflow: visible; }
  .gesture-settings { grid-template-columns: 1fr; }
  .toggle-control { justify-self: start; }
  .help-steps { grid-template-columns: 1fr; }
  body { background-attachment: scroll; }
}

html.is-fullscreen,
html.is-fullscreen body {
  width: 100%;
  height: 100%;
  min-width: 0;
  overflow: hidden;
}

html.is-fullscreen .app-shell {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 100%;
  max-height: none;
  padding: 0;
  overflow: hidden;
}

html.is-fullscreen .brand-lockup,
html.is-fullscreen .locale-switcher,
html.is-fullscreen .help-button,
html.is-fullscreen .stage-actions,
html.is-fullscreen .controls,
html.is-fullscreen .help-dialog {
  display: none;
}

html.is-fullscreen .topbar {
  position: fixed;
  top: clamp(0.75rem, 2vw, 1.25rem);
  right: clamp(0.75rem, 2vw, 1.25rem);
  z-index: 10;
  margin: 0;
}

html.is-fullscreen .topbar-actions { gap: 0; }
html.is-fullscreen .stage-card {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-height: 100%;
  aspect-ratio: auto;
  border-radius: 0;
}

html.is-fullscreen .fullscreen-button {
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(0.75rem);
}

@media (max-width: 30rem) {
  .effect-group-heading h2 { font-size: 1rem; }
  .effect-group-buttons { gap: 0.375rem; }
  .effect-button, .secondary-button { min-height: 2.5rem; padding-inline: 0.6875rem; font-size: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}