/* ==========================================================================
   PIXEL SLIDE — DESIGN SYSTEM & STYLESHEET
   Aesthetics: Deep Cyber Slate, Electric Cyan / Purple / Emerald, Glassmorphism
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-main: #070a12;
  --bg-surface: #0f1523;
  --bg-surface-elevated: #161e33;
  --bg-glass: rgba(18, 26, 44, 0.65);
  --bg-glass-strong: rgba(15, 22, 38, 0.85);
  --bg-glass-subtle: rgba(255, 255, 255, 0.04);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 255, 0.25);
  --border-focus: #00e5ff;

  --accent-cyan: #00e5ff;
  --accent-purple: #9d4edd;
  --accent-blue: #3a86ff;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --gradient-primary: linear-gradient(135deg, #00e5ff 0%, #7928ca 50%, #ff0080 100%);
  --gradient-accent: linear-gradient(135deg, #00e5ff 0%, #3a86ff 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.01) 100%);
  --gradient-glow: radial-gradient(circle, rgba(0, 229, 255, 0.15) 0%, rgba(0, 0, 0, 0) 70%);

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* Shadows & Elevations */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-neon-cyan: 0 0 20px rgba(0, 229, 255, 0.35);
  --shadow-neon-purple: 0 0 20px rgba(157, 78, 221, 0.35);

  /* Dimensions & Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.5;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input {
  font-family: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

button {
  cursor: pointer;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ==========================================================================
   Ambient Background Lighting & Grid
   ========================================================================== */
.ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.4;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: #00e5ff;
  top: -150px;
  left: 15%;
}

.orb-2 {
  width: 600px;
  height: 600px;
  background: #7928ca;
  bottom: -200px;
  right: 10%;
  animation-duration: 24s;
  animation-delay: -6s;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: #3a86ff;
  top: 40%;
  left: 60%;
  opacity: 0.25;
  animation-duration: 20s;
  animation-delay: -12s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.1); }
  100% { transform: translate(-30px, 60px) scale(0.95); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
}

/* ==========================================================================
   Root Layout & Navigation
   ========================================================================== */
#app-root {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  transition: transform var(--transition-fast);
}

.logo-group:hover {
  transform: scale(1.02);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #050811;
  box-shadow: var(--shadow-neon-cyan);
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 1px;
}

.logo-highlight {
  color: var(--accent-cyan);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-glass-subtle);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-glow);
  transform: translateY(-1px);
}

.glass-pill-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-glass-subtle);
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.glass-pill-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-neon-cyan);
  transform: translateY(-1px);
}

/* ==========================================================================
   Screen Management
   ========================================================================== */
.screen {
  display: none;
  flex-direction: column;
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 48px;
  animation: fadeInScreen 0.3s ease-out forwards;
}

.screen.active {
  display: flex;
}

@keyframes fadeInScreen {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.screen-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.back-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  transform: translateX(-2px);
}

.screen-title-group h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
}

.screen-title-group p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ==========================================================================
   HOME SCREEN
   ========================================================================== */
.hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin: 20px auto 0;
  max-width: 800px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--accent-cyan);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 580px;
  margin-bottom: 36px;
}

/* Upload Container */
.upload-container {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.upload-dropzone {
  border: 2px dashed rgba(0, 229, 255, 0.35);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.upload-dropzone:hover, .upload-dropzone.drag-over {
  border-color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.05);
  box-shadow: var(--shadow-neon-cyan);
  transform: translateY(-2px);
}

.dropzone-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-bounce);
}

.dropzone-icon svg {
  width: 26px;
  height: 26px;
}

.upload-dropzone:hover .dropzone-icon {
  transform: scale(1.15) rotate(-5deg);
}

.dropzone-text {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.dropzone-text strong {
  color: var(--accent-cyan);
}

.dropzone-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.preset-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
}

.preset-divider::before,
.preset-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-subtle);
}

.preset-divider span {
  padding: 0 16px;
}

/* Preset Gallery */
.preset-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  width: 100%;
}

.preset-thumb-card {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--border-subtle);
  background: var(--bg-surface);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.preset-thumb-card img,
.preset-thumb-card canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-normal);
}

.preset-thumb-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-neon-cyan);
  transform: translateY(-4px);
}

.preset-thumb-card:hover img,
.preset-thumb-card:hover canvas {
  transform: scale(1.08);
}

.preset-badge {
  position: absolute;
  bottom: 0;
  inset-inline: 0;
  padding: 6px 8px;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.85) 0%, transparent 100%);
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-primary);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

/* ==========================================================================
   LEVEL SELECT SCREEN
   ========================================================================== */
.level-selection-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 32px;
  align-items: start;
}

.image-preview-card {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-md);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.95rem;
}

.text-link-btn {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition-fast);
}

.text-link-btn:hover {
  opacity: 0.8;
}

.preview-canvas-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
}

#preview-canvas {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.preview-grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
}

/* Level Cards Grid */
.level-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.level-card {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.level-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--card-color, var(--accent-cyan));
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.level-card:hover {
  border-color: var(--card-color, var(--accent-cyan));
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px var(--card-glow, rgba(0, 229, 255, 0.2));
}

.level-card:hover::before {
  opacity: 1;
}

.level-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.level-title-block h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.level-grid-dim {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.level-badge-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  color: var(--card-color, var(--accent-cyan));
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.level-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.level-card-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.level-btn-action {
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.level-card:hover .level-btn-action {
  background: var(--card-color, var(--accent-cyan));
  color: #050811;
  font-weight: 700;
}

/* ==========================================================================
   GAMEPLAY SCREEN & HUD
   ========================================================================== */
#screen-game {
  align-items: center;
  padding-top: 12px;
  max-width: 720px;
}

.game-hud {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 10px 16px;
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
}

.hud-left, .hud-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.88rem;
  transition: all var(--transition-fast);
}

.hud-btn:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.1);
  transform: translateY(-1px);
}

.hud-btn.icon-only {
  padding: 8px 10px;
  font-size: 1.05rem;
}

.hud-btn.active {
  background: rgba(0, 229, 255, 0.2);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.level-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  font-weight: 700;
}

.hud-center {
  display: flex;
  align-items: center;
  gap: 16px;
}

.stat-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-label {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timer-box .stat-value {
  color: var(--accent-cyan);
}

.moves-box .stat-value {
  color: var(--accent-purple);
}

/* Main Puzzle Frame */
.puzzle-viewport-container {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.puzzle-board-frame {
  position: relative;
  width: min(92vw, 540px);
  height: min(92vw, 540px);
  background: #090e1a;
  border-radius: var(--radius-lg);
  border: 3px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 229, 255, 0.15);
  overflow: hidden;
  user-select: none;
  touch-action: none;
}

#pixi-canvas-mount {
  width: 100%;
  height: 100%;
}

#pixi-canvas-mount canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* Ghost Overlay (Hint) */
.ghost-overlay {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 10;
}

.ghost-overlay.visible {
  opacity: 0.45;
}

/* Shuffling overlay */
.shuffle-overlay {
  position: absolute;
  inset: 0;
  background: rgba(7, 10, 18, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 20;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.shuffle-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.shuffle-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(0, 229, 255, 0.2);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.game-footer-info {
  margin-top: 18px;
  text-align: center;
}

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

kbd {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

/* ==========================================================================
   LEADERBOARD SCREEN
   ========================================================================== */
.leaderboard-container {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.leaderboard-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.tab-btn {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-glass-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.tab-btn.active {
  background: var(--accent-cyan);
  color: #050811;
  border-color: var(--accent-cyan);
  font-weight: 700;
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.4);
}

.leaderboard-table-wrapper {
  overflow-x: auto;
  min-height: 280px;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.leaderboard-table th {
  padding: 12px 14px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

.leaderboard-table td {
  padding: 14px;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.leaderboard-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
}

.rank-1 { background: #ffd700; color: #000; box-shadow: 0 0 10px rgba(255, 215, 0, 0.5); }
.rank-2 { background: #c0c0c0; color: #000; }
.rank-3 { background: #cd7f32; color: #000; }
.rank-other { background: rgba(255, 255, 255, 0.08); color: var(--text-secondary); }

.leaderboard-empty {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 16px;
  text-align: center;
  color: var(--text-secondary);
}

.leaderboard-empty.visible {
  display: flex;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.6;
}

.empty-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.leaderboard-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.danger-link-btn {
  color: var(--accent-rose);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.danger-link-btn:hover {
  background: rgba(244, 63, 94, 0.1);
}

/* ==========================================================================
   MODALS & OVERLAYS
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 15, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 229, 255, 0.15);
  transform: scale(0.95);
  transition: transform 0.25s var(--transition-bounce);
  position: relative;
  z-index: 10;
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-icon-badge {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-cyan);
  margin: 0 auto 16px;
}

.modal-card h2 {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.modal-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 24px;
}

.modal-stats-row {
  display: flex;
  justify-content: center;
  gap: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 24px;
}

.modal-stat {
  display: flex;
  flex-direction: column;
}

.m-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.m-val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.modal-actions-stacked {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  width: 100%;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #050811;
}

.btn-primary:hover {
  background: #22eeff;
  box-shadow: var(--shadow-neon-cyan);
  transform: translateY(-2px);
}

.btn-glow {
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.05);
}

.btn-danger-outline {
  background: transparent;
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: var(--accent-rose);
}

.btn-danger-outline:hover {
  background: rgba(244, 63, 94, 0.15);
}

/* ==========================================================================
   VICTORY MODAL & CONFETTI
   ========================================================================== */
.confetti-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

.victory-card {
  max-width: 480px;
}

.crown-icon {
  font-size: 3rem;
  margin-bottom: 8px;
  animation: bounceCrown 1.5s infinite;
}

@keyframes bounceCrown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px) rotate(5deg); }
}

.victory-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.v-stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
}

.v-stat-card.highlight {
  border-color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.06);
}

.v-label {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.v-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
}

.v-stat-card.highlight .v-value {
  color: var(--accent-cyan);
}

.victory-form {
  margin-bottom: 24px;
  text-align: left;
}

.victory-form label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-with-btn {
  display: flex;
  gap: 8px;
}

.input-with-btn input {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.input-with-btn input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
}

.input-with-btn .btn {
  width: auto;
  padding: 10px 18px;
  white-space: nowrap;
}

.save-feedback {
  font-size: 0.82rem;
  margin-top: 6px;
  min-height: 18px;
}

.save-feedback.success {
  color: var(--accent-emerald);
}

.save-feedback.error {
  color: var(--accent-rose);
}

.victory-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.victory-actions button:last-child {
  grid-column: span 2;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 860px) {
  .level-selection-layout {
    grid-template-columns: 1fr;
  }
  
  .image-preview-card {
    max-width: 380px;
    margin: 0 auto;
  }

  .preset-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .app-header {
    padding: 12px 16px;
  }

  .logo-text {
    font-size: 1.15rem;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .game-hud {
    padding: 8px 12px;
  }

  .hud-btn span:not(.btn-icon) {
    display: none;
  }

  .stat-value {
    font-size: 1rem;
  }

  .victory-actions {
    grid-template-columns: 1fr;
  }

  .victory-actions button:last-child {
    grid-column: span 1;
  }
}