/* ==========================================================================
   Pixin' — Royal Obsidian Codex & Interactive Armory
   Art Direction: Obsidian Crypt (#14121D), Holy Cyan (#2CE8F5), Crest Gold (#E69519)
   ========================================================================== */

:root {
  color-scheme: dark;
  accent-color: #2CE8F5;

  /* 1. Background Hierarchy (Obsidian Crypt) */
  --bg-void: #0B0A10;
  --bg-base: #14121D;
  --bg-surface: #1D1A2B;
  --bg-surface-hover: #232036;
  --bg-elevated: #2A2C52;
  --bg-glass: rgba(20, 18, 29, 0.86);

  /* 2. Text & Typography Hierarchy */
  --text-primary: #F4F8FF;
  --text-secondary: #9BB0D6;
  --text-muted: #6678A1;

  /* 3. Brand & Accent Colors (Asset-Linked) */
  --accent-cyan: #2CE8F5;
  --accent-cyan-soft: #D6F8FF;
  --accent-cyan-glow: rgba(44, 232, 245, 0.26);
  --accent-sapphire: #1B4FD6;
  --accent-gold: #E69519;
  --accent-gold-light: #FFF275;
  --accent-gold-glow: rgba(230, 149, 25, 0.28);
  --accent-bronze: #873E14;
  --accent-ruby: #E62E4D;
  --accent-ruby-light: #FF758F;

  /* 4. Category Theme Colors */
  --cat-characters: #2CE8F5;
  --cat-items: #FFF275;
  --cat-tiles: #E69519;
  --cat-effects: #FF758F;

  /* 5. Pixel Frame & Borders */
  --border-subtle: #2B2742;
  --border-highlight: #4D689E;
  --shadow-pixel: 0 4px 0 #08070C;
  --shadow-pixel-lg: 0 6px 0 #07060B;

  /* 6. Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Menlo, Consolas, monospace;
  --font-sans: 'Inter', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

  /* 7. Safe Gradient Interpolation Space Fallback */
  --in-oklab: ;
  --in-oklch: ;
}

@supports (background: linear-gradient(in oklab, white, black)) {
  :root {
    --in-oklab: in oklab;
    --in-oklch: in oklch;
  }
}

/* Custom Scrollbar & Selection (browser-ui-theming) */
* {
  box-sizing: border-box;
  scrollbar-color: var(--border-highlight) var(--bg-base);
  scrollbar-width: thin;
}

::selection {
  background-color: var(--accent-cyan);
  color: var(--bg-void);
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-void);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  letter-spacing: 0.02em;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-base);
  background-image:
    radial-gradient(circle at 18% 0%, rgba(44, 232, 245, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 82% 8%, rgba(230, 149, 25, 0.08) 0%, transparent 45%),
    linear-gradient(to bottom var(--in-oklab), var(--bg-void) 0%, var(--bg-base) 280px, var(--bg-void) 100%);
  overflow-x: hidden;
}

body:has(dialog[open]) {
  overflow: hidden;
}

/* Typography Legibility (improve-text-layout-and-legibility) */
h1, h2, h3, h4 {
  margin: 0;
  text-wrap: balance;
  font-weight: 700;
  line-height: 1.25;
}

p, li {
  margin: 0;
  text-wrap: pretty;
}

code, pre, .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* Crisp Pixel Art Rendering */
.pixel-art {
  image-rendering: -moz-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  image-rendering: pixelated;
  user-select: none;
}

/* Focus Ring */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* ==========================================================================
   Top Navigation Bar
   ========================================================================== */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1320px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: opacity 120ms ease;
}

.brand:hover {
  opacity: 0.88;
}

.brand__logo {
  height: 34px;
  width: auto;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-highlight);
  color: var(--accent-cyan-soft);
  border-radius: 2px;
}

.top-nav__links {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  padding: 0.35rem 0.65rem;
  border-radius: 2px;
  transition: color 120ms ease, background-color 120ms ease;
}

.nav-link:hover {
  color: var(--accent-cyan-soft);
  background: rgba(44, 232, 245, 0.08);
}

/* ==========================================================================
   Hero Section & Interactive Diorama
   ========================================================================== */
.hero {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  color: var(--accent-cyan-soft);
  border-radius: 2px;
  box-shadow: 0 2px 0 var(--bg-void);
}

.badge--gold {
  border-color: var(--accent-gold);
  color: var(--accent-gold-light);
  background: rgba(230, 149, 25, 0.12);
}

.hero__title {
  font-size: clamp(1.85rem, 3.4vw, 2.75rem);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.hero__title--logo {
  margin-bottom: 1.25rem;
}

.hero__logo-img {
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.55)) drop-shadow(0 2px 6px rgba(44, 232, 245, 0.25));
}

.hero__lead {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.hero__specs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.spec-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.6rem 0.75rem;
  border-radius: 3px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.spec-chip__val {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-gold-light);
}

.spec-chip__label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

/* Pixel Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 0.7rem 1.2rem;
  border-radius: 3px;
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform 90ms ease, box-shadow 90ms ease, border-color 120ms ease, background-color 120ms ease;
  user-select: none;
}

.btn:active {
  transform: translateY(2px);
}

.btn--gold {
  background: linear-gradient(180deg var(--in-oklab), #F5A623 0%, #D4810B 100%);
  color: #14121D;
  border-color: var(--accent-gold-light);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.45),
    0 4px 0 var(--accent-bronze),
    0 6px 14px rgba(0, 0, 0, 0.45);
}

.btn--gold:hover {
  background: linear-gradient(180deg var(--in-oklab), #FFB838 0%, #E69519 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.6),
    0 4px 0 var(--accent-bronze),
    0 0 18px var(--accent-gold-glow);
}

.btn--gold:active {
  box-shadow: 0 2px 0 var(--accent-bronze);
}

.btn--cyan {
  background: linear-gradient(180deg var(--in-oklab), #2CE8F5 0%, #1599C2 100%);
  color: #0B0A10;
  border-color: var(--accent-cyan-soft);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    0 4px 0 #0D4B6E;
}

.btn--cyan:hover {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.6),
    0 4px 0 #0D4B6E,
    0 0 16px var(--accent-cyan-glow);
}

.btn--secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-highlight);
  box-shadow: 0 4px 0 var(--bg-void);
}

.btn--secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
}

.btn--sm {
  padding: 0.42rem 0.75rem;
  font-size: 0.8rem;
}

/* Hero Right Column: Interactive Stage */
.hero__stage-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-highlight);
  border-radius: 4px;
  padding: 1rem;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.05),
    0 8px 0 var(--bg-void),
    0 12px 32px rgba(0, 0, 0, 0.5);
}

.hero__stage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.stage-live-dot {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

.stage-live-dot::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  display: inline-block;
}

.hero__canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background:
    radial-gradient(circle at 50% 60%, #26294A 0%, #161524 100%);
  border: 2px solid var(--bg-void);
  border-radius: 3px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

#hero-diorama-canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero__stage-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.scene-btn {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.45rem 0.5rem;
  background: var(--bg-base);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  cursor: pointer;
  transition: all 120ms ease;
}

.scene-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.scene-btn[aria-pressed="true"] {
  background: var(--bg-elevated);
  color: var(--accent-cyan-soft);
  border-color: var(--accent-cyan);
  box-shadow: inset 0 0 8px rgba(44, 232, 245, 0.2);
}

.hero__stage-caption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ==========================================================================
   Sticky Filter & Search Toolbar
   ========================================================================== */
.catalog {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.toolbar {
  position: sticky;
  top: 0.75rem;
  z-index: 30;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-bottom: 2px solid var(--border-subtle);
  border-radius: 6px;
  padding: 0.85rem 1.25rem;
  margin-bottom: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.toolbar__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.cat-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  cursor: pointer;
  transition: all 120ms ease;
}

.cat-tab:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.cat-tab[aria-selected="true"] {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  box-shadow: 0 2px 0 var(--bg-void), inset 0 0 0 1px var(--accent-cyan-glow);
}

.cat-tab__count {
  font-size: 0.7rem;
  padding: 0.05rem 0.4rem;
  background: var(--bg-base);
  border-radius: 2px;
  color: var(--accent-cyan);
}

.toolbar__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box__icon {
  position: absolute;
  left: 0.65rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  pointer-events: none;
}

.search-box__input {
  background: var(--bg-base);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 0.45rem 2rem 0.45rem 2rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  width: 260px;
  transition: border-color 120ms ease, width 150ms ease;
}

.search-box__input::placeholder {
  color: var(--text-muted);
}

.search-box__input:focus {
  border-color: var(--accent-cyan);
  outline: none;
}

.search-box__clear {
  position: absolute;
  right: 0.4rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  font-size: 0.8rem;
}

.view-toggles {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.toggle-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.45rem 0.7rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 120ms ease;
}

.toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.toggle-btn[aria-pressed="true"] {
  border-color: var(--accent-gold);
  color: var(--accent-gold-light);
}

/* ==========================================================================
   Stage Backdrops (Visual Effects Guide: Checkerboard with repeating-conic-gradient)
   ========================================================================== */
.stage-backdrop--slate {
  background:
    radial-gradient(circle at 50% 62%, #292C4F 0%, #181726 78%);
}

.stage-backdrop--checker {
  --c1: #181726;
  --c2: #232136;
  background: repeating-conic-gradient(var(--c1) 0 25%, var(--c2) 0 50%) 0 / 16px 16px;
}

.stage-backdrop--daylight {
  --c1: #CBD4E1;
  --c2: #DCE3EE;
  background: repeating-conic-gradient(var(--c1) 0 25%, var(--c2) 0 50%) 0 / 16px 16px;
}

/* ==========================================================================
   Asset Card Grid
   ========================================================================== */
.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(295px, 1fr));
  gap: 1.25rem;
}

.asset-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-subtle);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.03),
    var(--shadow-pixel-lg);
  transition: transform 130ms cubic-bezier(0.2, 0.8, 0.2, 1), border-color 130ms ease, box-shadow 130ms ease;
  position: relative;
}

.asset-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-highlight);
  box-shadow:
    inset 0 0 0 1px rgba(44, 232, 245, 0.2),
    0 9px 0 var(--bg-void),
    0 0 22px rgba(44, 232, 245, 0.14);
}

.asset-card__header {
  padding: 0.85rem 1rem 0.65rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-bottom: 1px solid var(--border-subtle);
}

.asset-card__meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.cat-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.12rem 0.45rem;
  border-radius: 2px;
  border: 1px solid currentColor;
}

.cat-pill[data-cat="characters"] { color: var(--cat-characters); background: rgba(44, 232, 245, 0.1); }
.cat-pill[data-cat="items"]      { color: var(--cat-items);      background: rgba(255, 242, 117, 0.1); }
.cat-pill[data-cat="tiles"]      { color: var(--cat-tiles);      background: rgba(230, 149, 25, 0.12); }
.cat-pill[data-cat="effects"]    { color: var(--cat-effects);    background: rgba(255, 117, 143, 0.12); }

.dim-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.asset-card__title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.asset-card__title {
  font-size: 1.05rem;
  color: var(--text-primary);
}

.asset-card__id {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Card Interactive Stage */
.asset-card__stage {
  position: relative;
  height: 164px;
  display: grid;
  place-items: center;
  cursor: pointer;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.asset-card__stage:hover {
  background-color: var(--bg-surface-hover);
}

.asset-card__stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(44, 232, 245, 0.12) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 150ms ease;
}

.asset-card__stage:hover::after {
  opacity: 1;
}

.asset-card__canvas {
  width: 96px;
  height: 96px;
  filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.45));
}

.asset-card__stage-info {
  position: absolute;
  top: 0.5rem;
  right: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.12rem 0.42rem;
  background: rgba(11, 10, 16, 0.78);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
}

.asset-card__inspect-hint {
  position: absolute;
  bottom: 0.45rem;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.55rem;
  background: rgba(11, 10, 16, 0.88);
  color: var(--accent-cyan-soft);
  border: 1px solid var(--accent-cyan);
  border-radius: 2px;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 120ms ease, transform 120ms ease;
}

.asset-card__stage:hover .asset-card__inspect-hint {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* State Selector Pills inside Card */
.asset-card__states {
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(11, 10, 16, 0.25);
}

.state-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-base);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  cursor: pointer;
  transition: all 100ms ease;
}

.state-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.state-pill[aria-pressed="true"] {
  background: var(--bg-elevated);
  color: var(--accent-cyan-soft);
  border-color: var(--accent-cyan);
}

/* Mini Palette Strip inside Card */
.asset-card__palette {
  display: flex;
  height: 6px;
  width: 100%;
}

.asset-card__swatch {
  flex: 1;
  height: 100%;
}

/* Card Footer Actions */
.asset-card__footer {
  margin-top: auto;
  padding: 0.75rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.card-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 0.48rem 0.65rem;
  border-radius: 3px;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid var(--border-highlight);
  background: var(--bg-base);
  color: var(--text-primary);
  transition: all 100ms ease;
}

.card-btn:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
}

.card-btn--inspect {
  background: var(--bg-surface);
  border-color: var(--border-highlight);
  color: var(--text-primary);
  padding: 0.55rem 0.85rem;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.card-btn--inspect:hover {
  background: rgba(44, 232, 245, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan-soft);
  box-shadow: 0 0 10px rgba(44, 232, 245, 0.2);
}

.card-btn--download {
  background: linear-gradient(180deg var(--in-oklab), #2A325E 0%, #1B2142 100%);
  border-color: var(--accent-gold);
  color: var(--accent-gold-light);
}

.card-btn--download:hover {
  background: linear-gradient(180deg var(--in-oklab), #E69519 0%, #C4760A 100%);
  color: #14121D;
  border-color: var(--accent-gold-light);
}

/* ==========================================================================
   Empty State
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--bg-surface);
  border: 2px dashed var(--border-highlight);
  border-radius: 4px;
  margin-top: 1rem;
}

.empty-state[hidden] {
  display: none;
}

.empty-state__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.empty-state__desc {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   Asset Inspector Modal (<dialog> with Top-Layer Animation)
   ========================================================================== */
.inspector {
  width: min(1040px, 94vw);
  max-height: 90vh;
  margin: auto;
  padding: 0;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 2px solid var(--accent-cyan);
  border-radius: 4px;
  box-shadow:
    0 16px 0 var(--bg-void),
    0 24px 64px rgba(0, 0, 0, 0.85);
  overflow: hidden;

  /* Top-layer exit base state (animate-to-from-top-layer) */
  opacity: 0;
  transform: scale(0.95);
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.2s;
  transition-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  transition-behavior: allow-discrete;
}

.inspector::backdrop {
  background-color: rgba(8, 7, 12, 0);
  backdrop-filter: blur(4px);
  transition-property: background-color, display, overlay;
  transition-duration: 0.2s;
  transition-timing-function: ease-out;
  transition-behavior: allow-discrete;
}

:is(.inspector[open]):where(:not([data-closing])) {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: scale(1);

  @starting-style {
    opacity: 0;
    transform: scale(0.95);
  }

  &::backdrop {
    background-color: rgba(8, 7, 12, 0.78);

    @starting-style {
      background-color: rgba(8, 7, 12, 0);
    }
  }
}

.inspector__header {
  padding: 1rem 1.35rem;
  background: var(--bg-base);
  border-bottom: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.inspector__title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.inspector__title {
  font-size: 1.3rem;
}

.inspector__id-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.2rem 0.55rem;
  background: var(--bg-surface);
  color: var(--accent-cyan-soft);
  border: 1px solid var(--border-highlight);
  border-radius: 2px;
  cursor: pointer;
}

.inspector__id-btn:hover {
  border-color: var(--accent-cyan);
}

.inspector__close {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  cursor: pointer;
}

.inspector__close:hover {
  color: var(--text-primary);
  border-color: var(--accent-ruby-light);
}

.inspector__body {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 1.5rem;
  padding: 1.35rem;
  overflow-y: auto;
}

/* Inspector Left Column */
.inspector__left {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.inspector__stage-wrap {
  position: relative;
  height: 240px;
  border: 2px solid var(--bg-void);
  border-radius: 3px;
  display: grid;
  place-items: center;
  overflow: hidden;
  transition: box-shadow 150ms ease;
}

.inspector__stage-wrap.is-highlighting {
  box-shadow: inset 0 0 24px rgba(44, 232, 245, 0.25);
}

/* Pixel Probe HUD (Hover coordinates & HEX inspect) */
.inspector__pixel-probe {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 5;
  background: rgba(11, 10, 16, 0.88);
  border: 1px solid var(--border-highlight);
  border-radius: 2px;
  padding: 0.25rem 0.55rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-primary);
  pointer-events: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

.inspector__pixel-probe .probe-coord {
  color: var(--accent-cyan);
  font-weight: 700;
}

.inspector__pixel-probe .probe-swatch {
  width: 10px;
  height: 10px;
  border-radius: 1px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  flex-shrink: 0;
}

.inspector__canvas-box {
  position: relative;
  width: 192px;
  height: 192px;
  cursor: crosshair;
}

#inspector-canvas {
  width: 192px;
  height: 192px;
  display: block;
}

/* 16x16 Pixel Grid Overlay (12x scale = 12px per cell)
   - 12px: 1px マイナーグリッド（薄い白線）
   - 48px: 4px メジャーグリッド（青紫線）
   - 96px: 8px 中心軸・中心十字（シアン線）
   - 接地ライン (Y=15 => 15*12 = 180px): 赤橙ライン
*/
.inspector__grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(44, 232, 245, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 232, 245, 0.45) 1px, transparent 1px),
    linear-gradient(to right, rgba(77, 104, 158, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(77, 104, 158, 0.35) 1px, transparent 1px),
    linear-gradient(to right, rgba(255, 255, 255, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size:
    96px 96px,
    96px 96px,
    48px 48px,
    48px 48px,
    12px 12px,
    12px 12px;
  border: 1px solid rgba(44, 232, 245, 0.5);
}

.inspector__grid-overlay::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 180px;
  height: 1px;
  background: rgba(230, 149, 25, 0.6);
  pointer-events: none;
}

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

/* 1x Actual Size PiP Wipe */
.inspector__pip-1x {
  position: absolute;
  bottom: 0.65rem;
  right: 0.65rem;
  background: rgba(11, 10, 16, 0.86);
  border: 1px solid var(--border-highlight);
  padding: 0.35rem 0.5rem;
  border-radius: 2px;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-secondary);
}

#inspector-canvas-1x {
  width: 16px;
  height: 16px;
}

.inspector__controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: var(--bg-base);
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.ctrl-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.3rem 0.55rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  cursor: pointer;
}

.ctrl-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.ctrl-btn[aria-pressed="true"] {
  background: var(--bg-elevated);
  color: var(--accent-cyan-soft);
  border-color: var(--accent-cyan);
}

/* State Tabs & Frame Strip in Inspector */
.inspector__states-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.inspector__state-desc {
  font-size: 0.83rem;
  color: var(--text-secondary);
  background: var(--bg-base);
  padding: 0.6rem 0.75rem;
  border-left: 3px solid var(--accent-cyan);
  border-radius: 2px;
}

.frame-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
}

.frame-cell {
  background: var(--bg-base);
  border: 2px solid var(--border-subtle);
  border-radius: 3px;
  padding: 0.45rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
  transition: border-color 100ms ease, background-color 100ms ease;
}

.frame-cell:hover {
  border-color: var(--border-highlight);
}

.frame-cell[aria-selected="true"] {
  border-color: var(--accent-cyan);
  background: var(--bg-elevated);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.frame-cell__canvas {
  width: 48px;
  height: 48px;
}

.frame-cell__meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.3;
}

.frame-cell__ms {
  color: var(--accent-gold-light);
  font-weight: 700;
}

.inspector__frame-note {
  font-size: 0.8rem;
  color: var(--accent-cyan-soft);
  background: rgba(44, 232, 245, 0.07);
  border: 1px solid rgba(44, 232, 245, 0.25);
  padding: 0.55rem 0.75rem;
  border-radius: 3px;
}

/* Inspector Right Column */
.inspector__right {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.panel-box {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 0.85rem 1rem;
}

.panel-box__title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sheet-overview-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sheet-canvas-container {
  position: relative;
  display: inline-block;
  border: 1px solid var(--border-highlight);
  background: repeating-conic-gradient(#181726 0 25%, #232136 0 50%) 0 / 12px 12px;
  cursor: pointer;
}

.sheet-canvas-container:hover {
  border-color: var(--accent-cyan);
}

#inspector-sheet-canvas {
  display: block;
}

.sheet-meta-list {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sheet-meta-hint {
  margin-top: 0.35rem;
  font-size: 0.7rem;
  color: var(--accent-cyan-soft);
  background: rgba(44, 232, 245, 0.08);
  padding: 0.2rem 0.4rem;
  border-radius: 2px;
  display: inline-block;
}

/* Palette Swatches */
.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
  gap: 0.4rem;
}

.swatch-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.45rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-primary);
  transition: border-color 100ms ease, transform 90ms ease;
}

.swatch-btn:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-1px);
}

.swatch-color {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  box-shadow: inset 2px 2px 0 rgba(255, 255, 255, 0.28), 0 0 0 1px rgba(0, 0, 0, 0.6);
  flex-shrink: 0;
}

/* Download Actions Grid in Inspector */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.inspector__footer {
  padding: 0.6rem 1.35rem;
  background: var(--bg-void);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.1rem 0.35rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: 2px;
  color: var(--text-primary);
}

/* ==========================================================================
   Package Spec & Integration Guide Section
   ========================================================================== */
.spec-section {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  border-top: 1px solid var(--border-subtle);
}

.spec-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.spec-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1.15rem;
  box-shadow: var(--shadow-pixel);
}

.spec-card__title {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--accent-cyan-soft);
  margin-bottom: 0.45rem;
}

.spec-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Site Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-void);
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-base);
  color: var(--text-primary);
  border: 2px solid var(--accent-cyan);
  border-radius: 3px;
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  box-shadow: 0 6px 0 var(--bg-void), 0 8px 24px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  gap: 0.55rem;
  animation: toast-in 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive & Reduced Motion
   ========================================================================== */
@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .inspector__body {
    grid-template-columns: 1fr;
  }
  .hero__specs {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .toolbar {
    padding: 0.75rem 0.85rem;
    gap: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .inspector {
    transform: none;
    transition-duration: 0.05s;
  }
  @starting-style {
    :is(.inspector[open]):where(:not([data-closing])) {
      transform: none;
    }
  }
}