/* ==========================================================================
   den-kit v1: components.css
   Shared Design System: Marquee Night Component Library
   Strictly namespaced: .den-*, --den-*, @keyframes den-*, [data-den-*]
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. ACCESSIBILITY & FOCUS DEFAULTS
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--den-cyan-core, #00E5FF);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   1. BUTTONS (.den-btn)
   -------------------------------------------------------------------------- */
.den-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--den-radius-sm, 8px);
  font-family: 'Den Display', Impact, 'Arial Narrow', sans-serif;
  font-size: var(--den-font-body-lg, 1.125rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transform: translateY(0);
  transition: transform 80ms cubic-bezier(0.2, 0.8, 0.4, 1), opacity 150ms ease;
}

/* Arcade Button: Chunky 3D Molten Gold Press (6px physical depth) */
.den-btn--arcade {
  background: var(--den-gradient-molten-gold, linear-gradient(180deg, #FFF3B0 0%, #FFD700 28%, #D9A520 68%, #7A5205 100%));
  color: #0A0A14;
  box-shadow: 0 6px 0 var(--den-gold-shadow, #7A5205), 0 10px 18px rgba(0, 0, 0, 0.6);
}

.den-btn--arcade:hover {
  filter: brightness(1.08);
}

.den-btn--arcade:active {
  transform: translateY(4px);
  box-shadow: 0 2px 0 var(--den-gold-shadow, #7A5205), 0 4px 8px rgba(0, 0, 0, 0.4);
}

/* Neon Tube Button */
.den-btn--neon {
  color: var(--den-cyan-core, #00E5FF);
  background: rgba(0, 229, 255, 0.05);
  border: 2px solid var(--den-cyan-core, #00E5FF);
  box-shadow: var(--den-glow-neon-cyan, 0 0 4px #00E5FF, 0 0 12px rgba(0, 229, 255, 0.6), 0 0 24px rgba(0, 229, 255, 0.3)), inset 0 0 10px rgba(0, 229, 255, 0.15);
}

.den-btn--neon:hover {
  background: rgba(0, 229, 255, 0.15);
}

.den-btn--neon:active {
  transform: scale(0.97);
}

/* Ghost Button */
.den-btn--ghost {
  background: transparent;
  color: var(--den-text-secondary, #E8E8F0);
  border: 1px solid var(--den-panel-border, #2E2A4A);
}

.den-btn--ghost:hover {
  background: var(--den-panel-surface, #1A1A2E);
  color: var(--den-text-primary, #FFFFFF);
}

.den-btn--ghost:active {
  transform: scale(0.98);
}

/* Danger Button */
.den-btn--danger {
  background: var(--den-danger, #E74C3C);
  color: #FFFFFF;
  box-shadow: 0 6px 0 #962217, 0 10px 18px rgba(0, 0, 0, 0.6);
}

.den-btn--danger:hover {
  filter: brightness(1.1);
}

.den-btn--danger:active {
  transform: translateY(4px);
  box-shadow: 0 2px 0 #962217, 0 4px 8px rgba(0, 0, 0, 0.4);
}

/* Button Sizes */
.den-btn--sm {
  min-height: 36px;
  padding: 8px 16px;
  font-size: var(--den-font-caption, 0.875rem);
}

.den-btn--lg {
  min-height: 48px;
  padding: 14px 28px;
  font-size: var(--den-font-body-lg, 1.125rem);
}

.den-btn--xl {
  min-height: 56px;
  padding: 18px 36px;
  font-size: var(--den-font-h3, 1.35rem);
}

/* Disabled State */
.den-btn:disabled,
.den-btn--disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
  box-shadow: none !important;
}

/* Loading State (CSS-only non-sparkle spinner) */
.den-btn--loading {
  color: transparent !important;
  pointer-events: none;
}

.den-btn--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: den-spinner 600ms linear infinite;
}

.den-btn--arcade.den-btn--loading::after {
  border-color: rgba(10, 10, 20, 0.25);
  border-top-color: #0A0A14;
}

.den-btn--neon.den-btn--loading::after {
  border-color: rgba(0, 229, 255, 0.2);
  border-top-color: var(--den-cyan-core, #00E5FF);
}

@keyframes den-spinner {
  to {
    transform: rotate(360deg);
  }
}

/* --------------------------------------------------------------------------
   2. ROOM CODE INPUT (.den-code-input & .den-code-slot)
   -------------------------------------------------------------------------- */
.den-code-input {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
}

.den-code-slot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 68px;
  box-sizing: border-box;
  background: var(--den-panel-bg, #151525);
  border: 2px dashed var(--den-brand-purple, #9B59B6);
  border-radius: var(--den-radius-sm, 8px);
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--den-text-primary, #FFFFFF);
  text-align: center;
  user-select: none;
  transition: border-color 150ms ease, background-color 150ms ease;
}

/* Pre-glow layer for focused pulse */
.den-code-slot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--den-radius-sm, 8px) + 2px);
  border: 2px solid var(--den-cyan-core, #00E5FF);
  box-shadow: var(--den-glow-neon-cyan, 0 0 4px #00E5FF, 0 0 12px rgba(0, 229, 255, 0.6));
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
}

.den-code-slot--focused {
  border: 2px solid var(--den-cyan-core, #00E5FF);
}

.den-code-slot--focused::after {
  opacity: 0.9;
}

.den-code-slot--filled {
  border: 2px solid var(--den-brand-gold, #D9A520);
  color: var(--den-gold-light, #FFD700);
  text-shadow: var(--den-text-glow-gold, 0 0 8px rgba(255, 215, 0, 0.8), 0 0 20px rgba(217, 165, 32, 0.45));
}

.den-code-input--error .den-code-slot,
.den-code-slot--error {
  border-color: var(--den-danger, #E74C3C);
  color: var(--den-danger-bright, #FF2A2A);
  animation: den-shake-x 320ms ease-out;
}

@keyframes den-shake-x {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* --------------------------------------------------------------------------
   3. PANELS (.den-panel & .den-panel--neon)
   -------------------------------------------------------------------------- */
.den-panel {
  position: relative;
  background: var(--den-panel-bg, #151525);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-md, 14px);
  padding: var(--den-space-lg, 24px);
  box-sizing: border-box;
  overflow: hidden;
}

.den-panel--neon {
  border-color: var(--den-brand-purple, #9B59B6);
}

/* Pre-glow pseudo-element; only opacity is animated */
.den-panel--neon::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--den-radius-md, 14px);
  border: 2px solid var(--den-brand-purple, #9B59B6);
  box-shadow: var(--den-glow-neon-purple, 0 0 4px #B066D6, 0 0 14px rgba(155, 89, 182, 0.6), 0 0 28px rgba(155, 89, 182, 0.25));
  opacity: 0;
  pointer-events: none;
}

.den-panel--neon.den-neon-on::after {
  animation: den-neon-flicker 550ms steps(8, end) forwards;
}

@keyframes den-neon-flicker {
  0%   { opacity: 0; }
  15%  { opacity: 0.7; }
  30%  { opacity: 0.2; }
  50%  { opacity: 0.9; }
  70%  { opacity: 0.4; }
  100% { opacity: 1; }
}

/* --------------------------------------------------------------------------
   4. MARQUEE FRAME (.den-marquee)
   -------------------------------------------------------------------------- */
.den-marquee {
  position: relative;
  border-radius: var(--den-radius-md, 14px);
  overflow: hidden;
}

.den-marquee__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.den-marquee__rect {
  fill: none;
  stroke: var(--den-brand-gold, #D9A520);
  stroke-width: 2px;
  stroke-dasharray: 14 14;
  animation: den-marquee-dash 1.2s linear infinite;
  rx: var(--den-radius-md, 14px);
  ry: var(--den-radius-md, 14px);
}

.den-marquee--paused .den-marquee__rect {
  animation-play-state: paused;
}

@keyframes den-marquee-dash {
  0%   { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 56; }
}

/* --------------------------------------------------------------------------
   5. CHIPS & BADGES (.den-chip & .den-badge)
   -------------------------------------------------------------------------- */
.den-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--den-radius-full, 9999px);
  font-family: 'Den UI', -apple-system, sans-serif;
  font-weight: 800;
  font-size: 11px;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  user-select: none;
}

.den-chip--gold {
  background: var(--den-gradient-molten-gold, linear-gradient(180deg, #FFF3B0 0%, #FFD700 28%, #D9A520 68%, #7A5205 100%));
  color: #0A0A14;
}

.den-chip--ember {
  background: rgba(255, 94, 30, 0.15);
  border: 1px solid var(--den-ember-core, #FF5E1E);
  color: var(--den-ember-flame, #FF9100);
}

.den-chip--purple {
  background: rgba(155, 89, 182, 0.2);
  border: 1px solid var(--den-brand-purple, #9B59B6);
  color: var(--den-text-secondary, #E8E8F0);
}

.den-chip--cyan {
  background: rgba(0, 229, 255, 0.15);
  border: 1px solid var(--den-cyan-core, #00E5FF);
  color: var(--den-cyan-core, #00E5FF);
}

.den-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: var(--den-radius-xs, 4px);
  background: var(--den-panel-surface, #1A1A2E);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--den-text-primary, #FFFFFF);
}

/* --------------------------------------------------------------------------
   6. BOTTOM NAVIGATION (.den-bottom-nav)
   -------------------------------------------------------------------------- */
.den-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(64px + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  box-sizing: border-box;
  background: var(--den-panel-bg, #151525);
  border-top: 1px solid var(--den-cyan-core, #00E5FF);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: var(--den-z-header-nav, 100);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.5);
}

.den-bottom-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 44px;
  color: var(--den-text-muted, #8E8EA8);
  text-decoration: none;
  font-family: 'Den UI', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  user-select: none;
  transition: color 150ms ease;
}

.den-bottom-nav__item:hover,
.den-bottom-nav__item:focus-visible {
  color: var(--den-text-primary, #FFFFFF);
}

.den-bottom-nav__item--active,
.den-bottom-nav__item[aria-selected="true"] {
  color: var(--den-cyan-core, #00E5FF);
  text-shadow: var(--den-text-glow-cyan, 0 0 8px rgba(0, 229, 255, 0.85));
}

/* --------------------------------------------------------------------------
   7. TOAST NOTIFICATIONS (.den-toast & .den-toast-stack)
   -------------------------------------------------------------------------- */
.den-toast-stack {
  position: fixed;
  bottom: calc(76px + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: var(--den-z-toast, 950);
  pointer-events: none;
}

.den-toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--den-panel-surface, #1A1A2E);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-sm, 8px);
  padding: 14px 18px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.6);
  font-family: 'Den UI', sans-serif;
  font-size: var(--den-font-body, 0.9375rem);
  color: var(--den-text-primary, #FFFFFF);
  animation: den-toast-in 320ms cubic-bezier(0.2, 0.9, 0.3, 1) forwards;
}

.den-toast--neon {
  border-color: var(--den-cyan-core, #00E5FF);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.3), 0 10px 24px rgba(0, 0, 0, 0.6);
}

.den-toast--gold {
  border-color: var(--den-brand-gold, #D9A520);
  box-shadow: 0 0 12px rgba(217, 165, 32, 0.3), 0 10px 24px rgba(0, 0, 0, 0.6);
}

.den-toast--ember {
  border-color: var(--den-ember-core, #FF5E1E);
  box-shadow: 0 0 12px rgba(255, 94, 30, 0.3), 0 10px 24px rgba(0, 0, 0, 0.6);
}

.den-toast--danger {
  border-color: var(--den-danger, #E74C3C);
  box-shadow: 0 0 12px rgba(231, 76, 60, 0.3), 0 10px 24px rgba(0, 0, 0, 0.6);
}

@keyframes den-toast-in {
  0%   { opacity: 0; transform: translateY(-16px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   8. BOTTOM SHEET / DRAWER (.den-sheet & .den-sheet-backdrop)
   -------------------------------------------------------------------------- */
.den-sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 20, 0.75);
  z-index: var(--den-z-drawer, 600);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 300ms ease, visibility 0s linear 300ms;
}

.den-sheet-backdrop--open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}

.den-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: calc(var(--den-z-drawer, 600) + 1);
  background: var(--den-panel-bg, #151525);
  border-top: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-lg, 20px) var(--den-radius-lg, 20px) 0 0;
  padding: 16px 24px calc(24px + env(safe-area-inset-bottom, 0px));
  box-sizing: border-box;
  transform: translateY(100%);
  visibility: hidden;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.4, 1), visibility 0s linear 300ms;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.8);
  max-height: 85vh;
  overflow-y: auto;
}

.den-sheet--open {
  transform: translateY(0);
  visibility: visible;
  transition-delay: 0s;
}

.den-sheet__handle {
  width: 44px;
  height: 5px;
  border-radius: 4px;
  background: #8E8EA8;
  margin: 0 auto 16px auto;
  cursor: grab;
}

/* --------------------------------------------------------------------------
   9. LEVEL BAR & XP TRACK (.den-level-bar)
   -------------------------------------------------------------------------- */
.den-level-bar {
  position: relative;
  width: 100%;
  height: 12px;
  background: var(--den-panel-surface, #1A1A2E);
  border-radius: 6px;
  overflow: hidden;
}

.den-level-bar__fill {
  position: relative;
  height: 100%;
  min-width: 6px;
  border-radius: 6px;
  background: var(--den-gradient-molten-gold, linear-gradient(180deg, #FFF3B0 0%, #FFD700 28%, #D9A520 68%, #7A5205 100%));
  transition: width 400ms cubic-bezier(0.2, 0.8, 0.4, 1);
}

.den-level-bar__pip {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--den-cyan-core, #00E5FF);
  border-radius: 3px;
  box-shadow: 0 0 8px var(--den-cyan-core, #00E5FF);
  animation: den-pip-pulse 1s ease-in-out infinite alternate;
}

@keyframes den-pip-pulse {
  from { opacity: 0.7; }
  to   { opacity: 1; }
}

/* --------------------------------------------------------------------------
   10. COIN CHIP (.den-coin)
   -------------------------------------------------------------------------- */
.den-coin {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--den-gradient-molten-gold, linear-gradient(180deg, #FFF3B0 0%, #FFD700 28%, #D9A520 68%, #7A5205 100%));
  box-shadow: inset 0 0 0 2px var(--den-gold-shadow, #7A5205), 0 3px 6px rgba(0, 0, 0, 0.5);
  vertical-align: middle;
}

/* Dimensional Wolf Silhouette */
.den-coin::after {
  content: '';
  width: 16px;
  height: 16px;
  background-color: #0A0A14;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2L8 8l-6 1 4 6-1 7 7-4 7 4-1-7 4-6-6-1z'/%3E%3C/svg%3E") no-repeat center / contain;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2L8 8l-6 1 4 6-1 7 7-4 7 4-1-7 4-6-6-1z'/%3E%3C/svg%3E") no-repeat center / contain;
  opacity: 0.85;
}

/* --------------------------------------------------------------------------
   11. AVATAR & FRAME TIERS (.den-avatar)
   -------------------------------------------------------------------------- */
.den-avatar {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--den-panel-surface, #1A1A2E);
}

.den-avatar__img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.den-frame--bronze {
  box-shadow: 0 0 0 2px #CD7F32, 0 2px 6px rgba(0, 0, 0, 0.6);
}

.den-frame--silver {
  box-shadow: 0 0 0 2px #E0E4E8, 0 0 10px rgba(224, 228, 232, 0.4);
}

.den-frame--gold {
  box-shadow: 0 0 0 2px var(--den-gold-core, #D9A520), 0 0 14px rgba(255, 215, 0, 0.5);
}

.den-frame--marquee {
  position: relative;
}

.den-frame--marquee::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px dashed var(--den-brand-gold, #D9A520);
  animation: den-rotate 4s linear infinite;
  pointer-events: none;
}

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

/* --------------------------------------------------------------------------
   12. MONIKER GLOW STYLES (.den-moniker)
   -------------------------------------------------------------------------- */
.den-moniker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Den UI', -apple-system, sans-serif;
  font-weight: 700;
  font-size: var(--den-font-body, 1rem);
  color: var(--den-text-primary, #FFFFFF);
}

.den-moniker--glow-gold {
  color: var(--den-gold-light, #FFD700);
  text-shadow: var(--den-text-glow-gold, 0 0 8px rgba(255, 215, 0, 0.8), 0 0 20px rgba(217, 165, 32, 0.45));
}

.den-moniker--glow-ember {
  color: var(--den-ember-flame, #FF9100);
  text-shadow: var(--den-text-glow-ember, 0 0 8px rgba(255, 94, 30, 0.85), 0 0 20px rgba(255, 145, 0, 0.45));
}

.den-moniker--glow-cyan {
  color: var(--den-cyan-core, #00E5FF);
  text-shadow: var(--den-text-glow-cyan, 0 0 8px rgba(0, 229, 255, 0.85));
}

.den-moniker--champion {
  font-family: 'Den Display', Impact, sans-serif;
  font-size: var(--den-font-h3, 1.25rem);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--den-gold-light, #FFD700);
  text-shadow: var(--den-text-glow-gold, 0 0 8px rgba(255, 215, 0, 0.8), 0 0 20px rgba(217, 165, 32, 0.45));
}

/* --------------------------------------------------------------------------
   13. SPLIT-FLAP DIGITS (.den-flap)
   -------------------------------------------------------------------------- */
.den-flap {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 60px;
  perspective: 400px;
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 40px;
  line-height: 60px;
  text-align: center;
  color: var(--den-text-primary, #FFFFFF);
  background: #0A0A14;
  border-radius: var(--den-radius-xs, 4px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
  user-select: none;
}

.den-flap__seam {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(0, 0, 0, 0.9);
  z-index: 10;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.den-flap__top,
.den-flap__bottom {
  position: absolute;
  left: 0;
  right: 0;
  height: 50%;
  overflow: hidden;
  background: #151525;
}

.den-flap__top {
  top: 0;
  border-radius: var(--den-radius-xs, 4px) var(--den-radius-xs, 4px) 0 0;
  line-height: 60px;
}

.den-flap__bottom {
  bottom: 0;
  border-radius: 0 0 var(--den-radius-xs, 4px) var(--den-radius-xs, 4px);
  line-height: 0px;
}

.den-flap--flipping .den-flap__top {
  transform-origin: center bottom;
  animation: den-flap-fold 180ms cubic-bezier(0.45, 0, 0.55, 1) forwards;
}

@keyframes den-flap-fold {
  0%   { transform: rotateX(0deg); }
  100% { transform: rotateX(-90deg); }
}

/* --------------------------------------------------------------------------
   14. LEADERBOARD ROW (.den-lb-row)
   -------------------------------------------------------------------------- */
.den-lb-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  background: var(--den-panel-bg, #151525);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-sm, 8px);
  margin-bottom: 8px;
  box-sizing: border-box;
}

.den-lb-row__rank {
  width: 32px;
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 1.5rem;
  text-align: center;
  color: var(--den-text-muted, #8E8EA8);
  flex-shrink: 0;
}

.den-lb-row__score {
  margin-left: auto;
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 1.75rem;
  letter-spacing: 0.04em;
  color: var(--den-text-primary, #FFFFFF);
  flex-shrink: 0;
}

.den-lb-row--rank-1 {
  border-left: 4px solid var(--den-gold-light, #FFD700);
  background: rgba(217, 165, 32, 0.08);
}
.den-lb-row--rank-1 .den-lb-row__rank {
  color: var(--den-gold-light, #FFD700);
  text-shadow: var(--den-text-glow-gold, 0 0 8px rgba(255, 215, 0, 0.8));
}

.den-lb-row--rank-2 {
  border-left: 4px solid #E0E4E8;
  background: rgba(224, 228, 232, 0.06);
}
.den-lb-row--rank-2 .den-lb-row__rank {
  color: #E0E4E8;
}

.den-lb-row--rank-3 {
  border-left: 4px solid #CD7F32;
  background: rgba(205, 127, 50, 0.06);
}
.den-lb-row--rank-3 .den-lb-row__rank {
  color: #CD7F32;
}

/* --------------------------------------------------------------------------
   15. RUBBER STAMP (.den-stamp)
   -------------------------------------------------------------------------- */
.den-stamp {
  display: inline-block;
  padding: 8px 16px;
  border: 4px double currentColor;
  border-radius: var(--den-radius-xs, 4px);
  font-family: 'Den Display', Impact, sans-serif;
  font-size: 1.75rem;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  transform: rotate(-8deg);
  user-select: none;
  animation: den-stamp-slam 300ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Phone: red / ember stamp */
.den-stamp--red {
  color: #FF4500;
  text-shadow: 0 0 10px rgba(255, 69, 0, 0.6);
  box-shadow: 0 0 12px rgba(255, 69, 0, 0.4);
}

/* TV: gold stamp (red strictly reserved for wrong answer) */
.den-stamp--gold {
  color: var(--den-gold-light, #FFD700);
  text-shadow: var(--den-text-glow-gold, 0 0 8px rgba(255, 215, 0, 0.8));
  box-shadow: 0 0 12px rgba(217, 165, 32, 0.4);
}

@keyframes den-stamp-slam {
  0%   { opacity: 0; transform: scale(2.2) rotate(-8deg); }
  100% { opacity: 1; transform: scale(1) rotate(-8deg); }
}

/* --------------------------------------------------------------------------
   16. REACTION BUBBLES (.den-reaction)
   -------------------------------------------------------------------------- */
.den-reaction {
  position: fixed;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(21, 21, 37, 0.92);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-full, 9999px);
  font-family: 'Den UI', sans-serif;
  font-size: 0.875rem;
  color: var(--den-text-primary, #FFFFFF);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
  z-index: var(--den-z-interstitial, 900);
  pointer-events: none;
  animation: den-reaction-float 1600ms cubic-bezier(0.2, 0.8, 0.4, 1) forwards;
}

@keyframes den-reaction-float {
  0%   { opacity: 0; transform: translate3d(0, 20px, 0) scale(0.8); }
  15%  { opacity: 1; transform: translate3d(0, 0, 0) scale(1); }
  80%  { opacity: 1; }
  100% { opacity: 0; transform: translate3d(0, -120px, 0) scale(1.1); }
}

/* --------------------------------------------------------------------------
   17. INTERSTITIAL OVERLAYS (.den-interstitial)
   -------------------------------------------------------------------------- */
.den-interstitial {
  position: fixed;
  inset: 0;
  z-index: var(--den-z-interstitial, 900);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 20, 0.92);
  text-align: center;
  padding: 24px;
  box-sizing: border-box;
  pointer-events: none;
}

.den-interstitial__kicker {
  font-family: 'Den UI', sans-serif;
  font-weight: 800;
  font-size: var(--den-font-caption, 0.875rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--den-gold-light, #FFD700);
  margin-bottom: 8px;
}

.den-interstitial__title {
  font-family: 'Den Display', Impact, sans-serif;
  font-size: var(--den-font-display-hero, 4rem);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 0.95;
  color: var(--den-text-primary, #FFFFFF);
  text-shadow: var(--den-text-glow-gold, 0 0 16px rgba(255, 215, 0, 0.6));
  margin: 0 0 12px 0;
}

.den-interstitial__sub {
  font-family: 'Den UI', sans-serif;
  font-size: var(--den-font-body-lg, 1.25rem);
  color: var(--den-text-secondary, #E8E8F0);
  margin: 0 0 16px 0;
}

.den-interstitial__count {
  font-family: 'Den Display', Impact, sans-serif;
  font-size: var(--den-font-display-tv, 3.5rem);
  color: var(--den-cyan-core, #00E5FF);
  text-shadow: var(--den-text-glow-cyan, 0 0 12px rgba(0, 229, 255, 0.85));
}

/* --------------------------------------------------------------------------
   18. FULL-SCREEN SPLASH (.den-splash)
   -------------------------------------------------------------------------- */
.den-splash {
  position: fixed;
  inset: 0;
  z-index: var(--den-z-splash, 1000);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--den-bg-canvas, #0A0A14);
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   19. SWEEPING VOLUMETRIC SPOTLIGHTS (.den-spotlight, TV only)
   -------------------------------------------------------------------------- */
.den-spotlight {
  position: fixed;
  inset: 0;
  z-index: var(--den-z-spotlight, 700);
  pointer-events: none;
  overflow: hidden;
  display: none;
}

.den-spotlight__cone-1,
.den-spotlight__cone-2 {
  position: absolute;
  width: 200%;
  height: 200%;
  top: -50%;
  left: -50%;
  opacity: 0.35;
  mix-blend-mode: screen;
  pointer-events: none;
}

.den-spotlight__cone-1 {
  background: conic-gradient(from 160deg at 20% 0%, transparent 0deg, rgba(255, 215, 0, 0.4) 15deg, transparent 30deg);
  animation: den-spotlight-1 4000ms ease-in-out infinite alternate;
}

.den-spotlight__cone-2 {
  background: conic-gradient(from 200deg at 80% 0%, transparent 0deg, rgba(0, 229, 255, 0.35) 15deg, transparent 30deg);
  animation: den-spotlight-2 4600ms ease-in-out infinite alternate;
}

@keyframes den-spotlight-1 {
  from { transform: rotate(-10deg); }
  to   { transform: rotate(15deg); }
}

@keyframes den-spotlight-2 {
  from { transform: rotate(10deg); }
  to   { transform: rotate(-15deg); }
}

/* --------------------------------------------------------------------------
   20. CLAW-SLASH WIPE (.den-claw)
   -------------------------------------------------------------------------- */
.den-claw {
  position: fixed;
  inset: 0;
  z-index: var(--den-z-interstitial, 900);
  pointer-events: none;
  overflow: hidden;
}

.den-claw__panel {
  position: absolute;
  left: -20%;
  width: 140%;
  height: 35%;
  background: var(--den-panel-bg, #151525);
  border-top: 3px solid var(--den-brand-gold, #D9A520);
  border-bottom: 3px solid var(--den-brand-purple, #9B59B6);
  transform: skewX(-20deg) translateX(-150%);
  will-change: transform;
}

.den-claw__panel:nth-child(1) {
  top: 0;
}

.den-claw__panel:nth-child(2) {
  top: 33%;
  border-color: var(--den-cyan-core, #00E5FF);
}

.den-claw__panel:nth-child(3) {
  top: 66%;
}

.den-claw--active .den-claw__panel {
  animation: den-claw-slide 600ms cubic-bezier(0.77, 0, 0.175, 1) forwards;
}

.den-claw--active .den-claw__panel:nth-child(1) { animation-delay: 0ms; }
.den-claw--active .den-claw__panel:nth-child(2) { animation-delay: 60ms; }
.den-claw--active .den-claw__panel:nth-child(3) { animation-delay: 120ms; }

@keyframes den-claw-slide {
  0%   { transform: skewX(-20deg) translateX(-150%); }
  45%, 55% { transform: skewX(-20deg) translateX(0%); }
  100% { transform: skewX(-20deg) translateX(150%); }
}

/* --------------------------------------------------------------------------
   21. SCREEN FLASH LAYERS (.den-flash--correct & .den-flash--wrong)
   -------------------------------------------------------------------------- */
.den-flash--correct,
.den-flash--wrong {
  position: fixed;
  inset: 0;
  z-index: var(--den-z-interstitial, 900);
  pointer-events: none;
  opacity: 0;
  will-change: opacity;
}

.den-flash--correct {
  box-shadow: inset 0 0 60px rgba(46, 204, 113, 0.85);
  border: 4px solid var(--den-success-bright, #2ECC71);
}

.den-flash--wrong {
  box-shadow: inset 0 0 60px rgba(231, 76, 60, 0.85);
  border: 4px solid var(--den-danger-bright, #FF2A2A);
}

.den-flash--active {
  animation: den-flash-pulse 500ms cubic-bezier(0.17, 0.89, 0.32, 1.25) forwards;
}

@keyframes den-flash-pulse {
  0%   { opacity: 0; }
  30%  { opacity: 1; }
  100% { opacity: 0; }
}

/* --------------------------------------------------------------------------
   22. HOT STREAK EMBER AURA (.den-streak)
   -------------------------------------------------------------------------- */
.den-streak {
  position: relative;
  display: inline-flex;
}

.den-streak::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  background: radial-gradient(circle, rgba(255, 94, 30, 0.45) 0%, rgba(255, 145, 0, 0.2) 60%, transparent 80%);
  opacity: 0.8;
  z-index: -1;
  pointer-events: none;
  transform: scale(1);
  animation: den-streak-pulse 1600ms ease-in-out infinite alternate;
  will-change: transform, opacity;
}

@keyframes den-streak-pulse {
  0%   { transform: scale(0.96); opacity: 0.6; }
  100% { transform: scale(1.06); opacity: 1; }
}

/* --------------------------------------------------------------------------
   23. PREFERENCES CONTROL (.den-prefs)
   -------------------------------------------------------------------------- */
.den-prefs {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  background: rgba(21, 21, 37, 0.85);
  border: 1px solid var(--den-panel-border, #2E2A4A);
  border-radius: var(--den-radius-full, 9999px);
  user-select: none;
  z-index: var(--den-z-header-nav, 100);
}

.den-prefs__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--den-text-muted, #8E8EA8);
  font-size: 14px;
  cursor: pointer;
  transition: color 150ms ease, background-color 150ms ease;
  outline: none;
}

.den-prefs__btn:focus-visible {
  outline: 2px solid var(--den-cyan-core, #00E5FF);
  outline-offset: 2px;
}

.den-prefs__btn:hover {
  color: var(--den-text-primary, #FFFFFF);
  background: var(--den-panel-surface, #1A1A2E);
}

.den-prefs__btn--active {
  color: var(--den-cyan-core, #00E5FF);
  background: rgba(0, 229, 255, 0.12);
}

/* --------------------------------------------------------------------------
   24. RESPONSIVE & SURFACE RULES
   -------------------------------------------------------------------------- */

/* Phones & Mobile Controllers (<= 480px) */
@media (max-width: 480px) {
  .den-code-slot {
    width: 54px;
    height: 68px;
  }

  .den-toast-stack {
    bottom: calc(76px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 32px);
  }
}

/* TV Stage Display (>= 1600px or [data-den-tier="tv-heavy"]) */
@media (min-width: 1600px) {
  .den-code-slot {
    width: 88px;
    height: 110px;
    font-size: 3.5rem;
  }

  .den-toast-stack {
    top: 32px;
    right: 32px;
    bottom: auto;
    left: auto;
    transform: none;
    width: 400px;
  }

  .den-spotlight {
    display: block;
  }
}

html[data-den-tier="tv-heavy"] .den-spotlight {
  display: block;
}

html[data-den-tier="tv-heavy"] .den-toast-stack {
  top: 32px;
  right: 32px;
  bottom: auto;
  left: auto;
  transform: none;
  width: 400px;
}

/* --------------------------------------------------------------------------
   25. CAPABILITY TIERS & REDUCED MOTION
   -------------------------------------------------------------------------- */

/* Phone Light Tier: no shake, no spotlight */
html[data-den-tier="phone-light"] .den-code-input--error .den-code-slot,
html[data-den-tier="phone-light"] .den-code-slot--error {
  animation: none !important;
}

html[data-den-tier="phone-light"] .den-spotlight {
  display: none !important;
}

/* Reduced Motion Tier */
html[data-den-tier="reduced"],
@media (prefers-reduced-motion: reduce) {
  .den-stamp,
  .den-toast,
  .den-interstitial__title {
    animation: den-reduced-fade 200ms ease forwards !important;
    transform: none !important;
  }

  .den-code-input--error .den-code-slot,
  .den-code-slot--error {
    animation: none !important;
    transform: none !important;
  }

  .den-marquee__rect {
    animation: none !important;
    stroke-dashoffset: 0 !important;
  }

  .den-spotlight {
    display: none !important;
  }

  .den-streak::before {
    animation: none !important;
  }

  .den-panel--neon.den-neon-on::after {
    animation: none !important;
    opacity: 1 !important;
  }

  .den-claw--active .den-claw__panel {
    animation: den-reduced-fade 250ms ease forwards !important;
    transform: none !important;
  }

  .den-frame--marquee::after {
    animation: none !important;
  }
}

/* The reduced tier suppresses other keyframes in base.css; these are opacity-only. */
:root[data-den-tier="reduced"] .den-root .den-stamp,
:root[data-den-tier="reduced"] .den-root .den-toast,
:root[data-den-tier="reduced"] .den-root .den-interstitial__title,
:root[data-den-tier="reduced"] .den-root .den-claw--active .den-claw__panel {
  animation: den-reduced-fade 200ms ease forwards !important;
}

@keyframes den-reduced-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}