:root {
  --canvas: #15171c;
  --surface: #20242b;
  --surface-raised: #292e37;
  --text: #f4f6f8;
  --text-muted: #b6bdc9;
  --border: #3b424e;
  --primary: #8be9d0;
  --accent: #ff8a6b;
  --focus: #8be9d0;
  --preview-stage-color: #2b313b;
  --preview-stage-pattern: linear-gradient(45deg, #353d49 25%, transparent 25%), linear-gradient(-45deg, #353d49 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #353d49 75%), linear-gradient(-45deg, transparent 75%, #353d49 75%);
  --preview-stage-position: 0 0, 0 12px, 12px -12px, -12px 0;
  --preview-stage-size: 24px 24px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --shadow: 0 18px 50px rgb(0 0 0 / 24%);
  --transition: 160ms ease;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--canvas);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--canvas);
}

button {
  font: inherit;
}

button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.app-shell {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 32px 20px;
  background: #1a1d23;
  border-right: 1px solid var(--border);
}

.brand h1,
.collection-header h2,
.brand p,
.collection-header p {
  margin: 0;
}

.brand h1 {
  margin-top: 6px;
  font-size: 1.5rem;
  letter-spacing: -0.04em;
}

.brand > p:last-child,
#collection-subtitle,
.item-count {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.background-control {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  margin-bottom: 24px;
  background: rgb(32 36 43 / 72%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.background-description {
  margin: 3px 0 0;
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.background-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.background-preset {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  min-height: 34px;
  padding: 6px 9px;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.background-preset:hover {
  color: var(--text);
  background: rgb(255 255 255 / 5%);
}

.background-preset[aria-pressed="true"] {
  color: var(--text);
  background: rgb(139 233 208 / 14%);
  border-color: var(--primary);
}

.preset-swatch {
  display: block;
  width: 14px;
  height: 14px;
  border: 1px solid rgb(244 246 248 / 40%);
  border-radius: 50%;
}

.preset-transparent {
  background: conic-gradient(#3b424e 25%, transparent 0 50%, #3b424e 0 75%, transparent 0);
  background-size: 6px 6px;
}

.preset-checker {
  background-color: #2b313b;
  background-image: linear-gradient(45deg, #353d49 25%, transparent 25%), linear-gradient(-45deg, #353d49 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #353d49 75%), linear-gradient(-45deg, transparent 75%, #353d49 75%);
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
  background-size: 8px 8px;
}

.preset-charcoal {
  background: #2b313b;
}

.preset-mint {
  background: #9fd8ce;
}

.preset-peach {
  background: #e8b79f;
}

.preset-lavender {
  background: #c9c0ee;
}

.preset-sky {
  background: #a9d4ed;
}

.preset-lemon {
  background: #e6cf75;
}

.brand > p:last-child {
  margin-top: 8px;
}

.eyebrow {
  color: var(--primary);
  font-size: 0.6875rem;
  font-weight: 750;
  letter-spacing: 0.14em;
}

.collection-list {
  display: grid;
  gap: 8px;
}

.collection-button {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  width: 100%;
  padding: 8px;
  color: var(--text-muted);
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.collection-button:hover {
  color: var(--text);
  background: rgb(255 255 255 / 5%);
}

.collection-button[aria-current="page"] {
  color: var(--text);
  background: var(--surface-raised);
  border-color: rgb(139 233 208 / 45%);
}

.collection-icon {
  display: grid;
  width: 40px;
  aspect-ratio: 1;
  overflow: hidden;
  place-items: center;
  background-color: #2d333d;
  background-image: linear-gradient(45deg, #363d49 25%, transparent 25%), linear-gradient(-45deg, #363d49 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #363d49 75%), linear-gradient(-45deg, transparent 75%, #363d49 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
  border-radius: 8px;
}

.collection-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.collection-name {
  overflow: hidden;
  font-size: 0.875rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.collection-meta {
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.content {
  width: min(1440px, 100%);
  padding: clamp(24px, 5vw, 64px);
  margin: 0 auto;
}

.collection-header {
  display: flex;
  gap: 24px;
  align-items: end;
  justify-content: space-between;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.collection-header h2 {
  margin-top: 6px;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: -0.05em;
}

#collection-subtitle {
  margin-top: 6px;
}

.item-count {
  flex: none;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: clamp(12px, 2vw, 20px);
}

.emoji-card {
  min-width: 0;
  padding: 0;
  overflow: hidden;
  color: inherit;
  text-align: left;
  cursor: zoom-in;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.emoji-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.emoji-stage,
.dialog-image-stage {
  background-color: var(--preview-stage-color);
  background-image: var(--preview-stage-pattern);
  background-position: var(--preview-stage-position);
  background-size: var(--preview-stage-size);
}

body[data-preview-background="transparent"] {
  --preview-stage-color: transparent;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="charcoal"] {
  --preview-stage-color: #2b313b;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="mint"] {
  --preview-stage-color: #9fd8ce;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="peach"] {
  --preview-stage-color: #e8b79f;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="lavender"] {
  --preview-stage-color: #c9c0ee;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="sky"] {
  --preview-stage-color: #a9d4ed;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

body[data-preview-background="lemon"] {
  --preview-stage-color: #e6cf75;
  --preview-stage-pattern: none;
  --preview-stage-position: 0 0;
  --preview-stage-size: auto;
}

.emoji-stage {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
}

.emoji-stage img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.emoji-name {
  display: block;
  padding: 10px 12px 12px;
  overflow: hidden;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.empty-state {
  padding: 32px;
  color: var(--text-muted);
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
}

.preview-dialog {
  width: min(680px, calc(100vw - 32px));
  padding: 16px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.preview-dialog::backdrop {
  background: rgb(0 0 0 / 68%);
  backdrop-filter: blur(4px);
}

.dialog-close {
  display: grid;
  width: 36px;
  height: 36px;
  padding: 0;
  place-items: center;
  margin-left: auto;
  color: var(--text);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: 50%;
}

.dialog-image-stage {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  margin-top: 8px;
  border-radius: var(--radius-sm);
}

.dialog-image-stage img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#dialog-title {
  margin: 12px 4px 2px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

@media (max-width: 760px) {
  .app-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    gap: 18px;
    padding: 20px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .collection-list {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .collection-button {
    flex: 0 0 min(220px, 72vw);
  }

  .content {
    padding: 24px 20px 40px;
  }

  .collection-header {
    align-items: start;
    flex-direction: column;
    gap: 14px;
  }

  .background-control {
    align-items: start;
    flex-direction: column;
  }

  .background-presets {
    justify-content: start;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(126px, 1fr));
    gap: 12px;
  }
}

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