/*
  2048 Dogs — layout-locked X/Twitter visual and UX layer.
  This stylesheet intentionally avoids changing the existing grid, component
  placement, dimensions, spacing, or responsive layout rules in styles.css.
*/

:root {
  --x-bg: #000000;
  --x-surface: #0f1419;
  --x-surface-raised: #16181c;
  --x-surface-hover: #1d2228;
  --x-border: #2f3336;
  --x-border-soft: rgba(239, 243, 244, .12);
  --x-text: #e7e9ea;
  --x-muted: #8b98a5;
  --x-subtle: #71767b;
  --x-blue: #1d9bf0;
  --x-blue-hover: #1a8cd8;
  --x-blue-active: #177cc0;
  --x-blue-soft: rgba(29, 155, 240, .12);
  --x-blue-ring: rgba(29, 155, 240, .26);
  --x-danger: #f4212e;
  --ux-accent: var(--x-blue);
  --ux-accent-strong: #8fd3ff;
  --ux-text: var(--x-text);
  --ux-text-muted: var(--x-muted);
  --ux-text-subtle: var(--x-subtle);
  --ux-line: var(--x-border);
  --ux-focus: var(--x-blue);
  --ux-focus-soft: var(--x-blue-ring);
  color-scheme: dark;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--x-bg) !important;
}

html,
body,
.content-body {
  background:
    radial-gradient(circle at 50% 44%, rgba(29, 155, 240, .11) 0%, rgba(29, 155, 240, .035) 30%, transparent 56%),
    var(--x-bg) !important;
  color: var(--x-text) !important;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overscroll-behavior: none;
}

body::before {
  background:
    linear-gradient(90deg, rgba(0,0,0,.34), transparent 25%, transparent 75%, rgba(0,0,0,.34)),
    linear-gradient(180deg, rgba(0,0,0,.18), transparent 30%, transparent 70%, rgba(0,0,0,.30)) !important;
}

::selection {
  background: rgba(29, 155, 240, .34);
  color: #ffffff;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font-synthesis: none;
}

button:disabled {
  cursor: not-allowed;
  filter: saturate(.55) brightness(.78);
}

:where(button, a, [tabindex]):focus-visible {
  outline: 3px solid var(--x-blue) !important;
  outline-offset: 3px !important;
}

:where(button, a, [tabindex]):focus:not(:focus-visible) {
  outline: none;
}

/* Header and score hierarchy */
.site-header {
  background: linear-gradient(180deg, rgba(15, 20, 25, .94), rgba(8, 11, 14, .76)) !important;
  border-color: var(--x-border-soft) !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.035) !important;
}

.site-header::before {
  background: linear-gradient(90deg, var(--x-blue), rgba(29,155,240,.22) 42%, transparent) !important;
  opacity: .72 !important;
}

.site-header h1,
.page-brand {
  color: var(--x-text) !important;
  text-shadow: 0 1px 0 rgba(255,255,255,.03), 0 12px 36px rgba(0,0,0,.32);
}

.eyebrow {
  color: #63c3ff !important;
}

.tagline {
  color: var(--x-muted) !important;
}

.score-box {
  background: linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.025)) !important;
  border-color: var(--x-border) !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.045), 0 8px 20px rgba(0,0,0,.18) !important;
}

.score-box span {
  color: var(--x-subtle) !important;
}

.score-box strong {
  color: var(--x-text) !important;
  text-shadow: none !important;
}

/* Primary action follows the familiar Twitter-blue CTA pattern. */
.primary-btn {
  background: var(--x-blue) !important;
  color: #ffffff !important;
  border-color: var(--x-blue) !important;
  box-shadow: 0 8px 22px rgba(29,155,240,.24), inset 0 1px 0 rgba(255,255,255,.18) !important;
  text-shadow: none !important;
  transition: background-color .16s ease, border-color .16s ease, box-shadow .16s ease, filter .16s ease !important;
}

.primary-btn:hover,
.primary-btn:focus-visible {
  background: var(--x-blue-hover) !important;
  color: #ffffff !important;
  border-color: var(--x-blue-hover) !important;
  box-shadow: 0 0 0 4px var(--x-blue-ring), 0 10px 26px rgba(29,155,240,.26) !important;
  filter: none !important;
}

.primary-btn:active {
  background: var(--x-blue-active) !important;
  border-color: var(--x-blue-active) !important;
  box-shadow: 0 4px 12px rgba(29,155,240,.20) !important;
  filter: none !important;
}

/* Supporting regions stay quiet so the board remains the focal point. */
.ad-placeholder,
.compact-ad {
  background: rgba(15, 20, 25, .54) !important;
  border-color: rgba(239,243,244,.08) !important;
  box-shadow: none !important;
  opacity: .62 !important;
}

.ad-placeholder span {
  color: rgba(139, 152, 165, .58) !important;
}

.ad-placeholder small {
  color: rgba(113, 118, 123, .52) !important;
}

.footer-links {
  background: rgba(15, 20, 25, .72) !important;
  border-color: rgba(239,243,244,.09) !important;
  box-shadow: none !important;
  opacity: .92 !important;
}

.footer-links a {
  background: transparent !important;
  color: var(--x-muted) !important;
  transition: background-color .15s ease, color .15s ease, box-shadow .15s ease !important;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  background: var(--x-blue-soft) !important;
  color: #c9ebff !important;
  box-shadow: inset 0 0 0 1px rgba(29,155,240,.22) !important;
}

/* Board and tile system */
.game-panel {
  isolation: isolate;
}

.game-panel::before {
  background: radial-gradient(circle at center, rgba(29,155,240,.24) 0%, rgba(29,155,240,.10) 30%, rgba(29,155,240,.025) 52%, transparent 72%) !important;
  filter: blur(20px) !important;
}

.game-card {
  background: linear-gradient(145deg, #101820, #080c10) !important;
  border-color: rgba(111, 203, 255, .78) !important;
  box-shadow:
    0 0 0 1px rgba(29,155,240,.23),
    0 0 38px rgba(29,155,240,.20),
    0 34px 88px rgba(0,0,0,.68) !important;
}

.dog-board {
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  cursor: grab;
  background: linear-gradient(180deg, #111a22, #0b1117) !important;
  border-color: rgba(111,203,255,.32) !important;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.055),
    inset 0 0 0 1px rgba(255,255,255,.025),
    0 18px 38px rgba(0,0,0,.52) !important;
}

.dog-board:active {
  cursor: grabbing;
}

.dog-board:focus-visible {
  outline-color: var(--x-blue) !important;
  box-shadow:
    0 0 0 5px rgba(29,155,240,.18),
    inset 0 1px 0 rgba(255,255,255,.07),
    inset 0 0 0 1px rgba(255,255,255,.035),
    0 20px 42px rgba(0,0,0,.56) !important;
}

.grid-cell {
  background: rgba(231, 233, 234, .075) !important;
  border-color: rgba(239,243,244,.055) !important;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.22) !important;
}

.tile.v2,
.tile.v4,
.tile.v8,
.tile.v16,
.tile.v32,
.tile.v64,
.tile.v128,
.tile.v256,
.tile.v512,
.tile.v1024,
.tile.v2048,
.tile.v4096,
.tile.high-tile,
.tile-inner {
  background: #f7f9f9 !important;
  color: #0f1419 !important;
}

.tile-inner {
  border-color: rgba(15,20,25,.16) !important;
  box-shadow: 0 8px 20px rgba(0,0,0,.30), inset 0 1px 0 rgba(255,255,255,.86) !important;
}

.dog-image {
  -webkit-user-drag: none;
}

.dog-image-wrap::after {
  background: linear-gradient(180deg, rgba(255,255,255,.06) 0%, transparent 46%, rgba(15,20,25,.18) 100%) !important;
}

.dog-value {
  background: rgba(255,255,255,.97) !important;
  color: #0f1419 !important;
  border-color: rgba(15,20,25,.17) !important;
  box-shadow: 0 5px 14px rgba(0,0,0,.24) !important;
}

.tile.v2048 .tile-inner,
.tile.high-tile .tile-inner {
  border-color: rgba(29,155,240,.74) !important;
  box-shadow:
    0 0 0 2px rgba(29,155,240,.30),
    0 0 32px rgba(29,155,240,.36),
    0 10px 24px rgba(0,0,0,.30) !important;
}

/* Collection: readable, secondary, and clearly interactive. */
.collection-shell {
  background: rgba(15,20,25,.88) !important;
  border-color: rgba(239,243,244,.10) !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.025) !important;
  opacity: 1 !important;
  transition: background-color .16s ease, border-color .16s ease !important;
}

.collection-shell:hover,
.collection-shell:focus-within {
  background: rgba(18,24,30,.96) !important;
  border-color: rgba(29,155,240,.24) !important;
  opacity: 1 !important;
}

.collection-intro h2,
.collection-progress strong {
  color: var(--x-text) !important;
}

.collection-progress,
.collection-detail {
  color: var(--x-muted) !important;
}

.collection-cta {
  background: rgba(239,243,244,.055) !important;
  color: #c4cbd1 !important;
  border-color: var(--x-border) !important;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease !important;
}

.collection-cta:hover,
.collection-cta:focus-visible {
  background: var(--x-blue-soft) !important;
  color: #d8f1ff !important;
  border-color: rgba(29,155,240,.58) !important;
}

.collection-card {
  background: rgba(239,243,244,.035) !important;
  color: var(--x-muted) !important;
  border-color: rgba(239,243,244,.085) !important;
  box-shadow: none !important;
  transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease, filter .15s ease !important;
}

.collection-card:hover:not(:disabled),
.collection-card:focus-visible,
.collection-card.is-selected {
  background: rgba(29,155,240,.10) !important;
  border-color: rgba(29,155,240,.62) !important;
  box-shadow: inset 0 0 0 1px rgba(29,155,240,.18), 0 0 20px rgba(29,155,240,.09) !important;
}

.collection-image-wrap {
  background: #11171d !important;
  border-color: rgba(239,243,244,.075) !important;
}

.collection-card.is-unlocked img {
  opacity: .78 !important;
  filter: saturate(.86) contrast(1.01) !important;
}

.collection-card:hover:not(:disabled) img,
.collection-card:focus-visible img,
.collection-card.is-selected img {
  opacity: 1 !important;
  filter: saturate(1) contrast(1.03) !important;
}

.collection-card.is-locked img {
  opacity: .20 !important;
  filter: grayscale(1) saturate(0) contrast(.90) !important;
}

.collection-lock,
.collection-value {
  background: rgba(15,20,25,.88) !important;
  color: #c9d1d9 !important;
  border-color: rgba(239,243,244,.13) !important;
  box-shadow: 0 3px 10px rgba(0,0,0,.28) !important;
}

.collection-card.is-unlocked .collection-lock {
  background: var(--x-blue) !important;
  color: #ffffff !important;
  border-color: rgba(255,255,255,.22) !important;
}

.collection-name {
  color: #b6bec6 !important;
}

.collection-status {
  color: var(--x-subtle) !important;
}

.collection-card.is-selected .collection-name,
.collection-card:focus-visible .collection-name {
  color: #eaf7ff !important;
}

.collection-detail {
  background: rgba(15,20,25,.97) !important;
  color: var(--x-text) !important;
  border-color: rgba(29,155,240,.44) !important;
  box-shadow: 0 10px 28px rgba(0,0,0,.48) !important;
}

/* Game status dialog */
.message-layer {
  background: rgba(0,0,0,.80) !important;
  backdrop-filter: blur(3px);
}

.message-card {
  background: linear-gradient(180deg, #161c22, #0f1419) !important;
  border-color: rgba(29,155,240,.30) !important;
  box-shadow: 0 34px 92px rgba(0,0,0,.76), inset 0 1px 0 rgba(255,255,255,.045) !important;
}

.message-card h2 {
  color: #f2f9ff !important;
}

.message-card p {
  color: var(--x-muted) !important;
}

/* Supporting pages */
.page-nav a {
  color: var(--x-muted) !important;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.page-nav a:hover,
.page-nav a:focus-visible,
.page-nav a[aria-current="page"] {
  color: #79ccff !important;
}

.content-card {
  background: rgba(15,20,25,.94) !important;
  border-color: var(--x-border) !important;
  box-shadow: 0 26px 76px rgba(0,0,0,.50), inset 0 1px 0 rgba(255,255,255,.025) !important;
}

.content-card h1,
.content-card h2 {
  color: var(--x-text) !important;
}

.content-card p,
.content-card li,
.page-footer {
  color: #aab4bd !important;
}

.content-card strong {
  color: #dfe6eb !important;
}

.content-card a {
  color: #69c6ff !important;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}

.content-card a:hover,
.content-card a:focus-visible {
  color: #a2ddff !important;
}

.content-note {
  background: rgba(29,155,240,.09) !important;
  border-color: rgba(29,155,240,.30) !important;
}

/* Screen-reader-only helper; visually removed without affecting layout. */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (hover: none) {
  .primary-btn:hover,
  .collection-cta:hover,
  .collection-card:hover:not(:disabled),
  .footer-links a:hover {
    filter: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --x-border: #687078;
    --x-muted: #c3c9ce;
    --x-subtle: #adb5bc;
  }

  .grid-cell,
  .score-box,
  .collection-card,
  .content-card {
    border-color: rgba(255,255,255,.34) !important;
  }
}

@media (forced-colors: active) {
  :where(button, a, [tabindex]):focus-visible {
    outline: 3px solid Highlight !important;
  }

  .tile-inner,
  .score-box,
  .collection-card,
  .content-card,
  .message-card {
    border-color: CanvasText !important;
  }
}

/* Mobile control safeguard: keep the New Game action visible on narrow and short screens. */
#new-game {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex: 0 0 auto !important;
  visibility: visible !important;
  opacity: 1 !important;
  white-space: nowrap !important;
  position: relative !important;
  z-index: 5 !important;
}

@media (max-width: 720px) and (orientation: portrait) {
  .header-actions {
    display: flex !important;
    flex: 0 0 auto !important;
    min-width: 0 !important;
    overflow: visible !important;
  }

  .score-wrap {
    min-width: 0 !important;
  }

  #new-game {
    min-width: 66px !important;
    min-height: 32px !important;
    padding: 5px 8px !important;
    font-size: 10px !important;
    line-height: 1 !important;
  }
}

@media (max-width: 320px) and (orientation: portrait) {
  .header-actions {
    gap: 3px !important;
  }

  .score-wrap {
    gap: 2px !important;
  }

  .score-box {
    min-width: 31px !important;
    padding-inline: 3px !important;
  }

  #new-game {
    min-width: 64px !important;
    padding-inline: 6px !important;
    font-size: 9.5px !important;
  }
}

@media (orientation: landscape) and (max-height: 430px) {
  #new-game {
    display: inline-flex !important;
    min-height: 30px !important;
    visibility: visible !important;
    opacity: 1 !important;
  }
}

/* Medium-short landscape fix (for viewports such as 860x514):
   compact the existing header content so the primary action stays inside
   the header panel. The page grid and section placement remain unchanged. */
@media (orientation: landscape) and (min-height: 431px) and (max-height: 660px) and (max-width: 1200px) {
  .site-header {
    padding: 10px !important;
    gap: 6px !important;
    grid-template-rows: auto minmax(0, 1fr) auto !important;
  }

  .site-header::before {
    top: 10px !important;
    bottom: 10px !important;
  }

  .brand-copy {
    gap: 3px !important;
  }

  .eyebrow {
    font-size: 9px !important;
    line-height: 1.15 !important;
    letter-spacing: .10em !important;
  }

  .site-header h1 {
    font-size: clamp(30px, 4.7vw, 40px) !important;
    line-height: .9 !important;
  }

  .tagline {
    display: none !important;
  }

  .header-actions {
    gap: 5px !important;
  }

  .score-wrap {
    gap: 4px !important;
  }

  .score-box {
    min-height: 0 !important;
    padding: 5px 4px !important;
  }

  .score-box span {
    font-size: 7px !important;
  }

  .score-box strong {
    margin-top: 2px !important;
    font-size: 14px !important;
  }

  #new-game {
    min-height: 32px !important;
    padding: 5px 8px !important;
    font-size: 11px !important;
    line-height: 1 !important;
  }

  .collection-intro {
    grid-template-columns: minmax(0, 1fr) auto !important;
    gap: 4px !important;
  }

  .collection-intro h2 {
    min-width: 0 !important;
    font-size: 14px !important;
    line-height: 1 !important;
    white-space: nowrap !important;
  }

  .collection-progress {
    gap: 2px !important;
    font-size: 9px !important;
    white-space: nowrap !important;
  }

  .collection-progress strong {
    font-size: 11px !important;
  }
}