/* ==========================================================================
   Snake Game
   Author:     Ramazan Çetinkaya (https://github.com/ramazancetinkaya)
   Repository: https://github.com/ramazancetinkaya/snake-game
   License:    MIT License
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties & Palette Themes
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette: Light & Neutral Harmonious Slate Scale */
  --bg-page: #f8fafc;            /* Clean light page background */
  --bg-surface: #ffffff;         /* Cards, modals, buttons */
  --bg-surface-subtle: #f1f5f9;  /* Secondary containers */
  --bg-board: #e2e8f0;           /* Slightly grayish game board */
  --bg-board-cell: #cbd5e1;      /* Grid accent / cell texture */
  --border-light: #e2e8f0;       /* Crisp hairline borders */
  --border-strong: #cbd5e1;      /* Emphasized borders */
  
  /* Text & Primary Accents (Dark Slate / Charcoal) */
  --text-primary: #0f172a;       /* Deep slate heading text */
  --text-secondary: #475569;     /* Body & secondary labels */
  --text-muted: #64748b;         /* Captions & helper text */
  --text-inverse: #ffffff;       /* Text on dark buttons */

  /* Snake Skin Accent Variables (Default: Obsidian Slate) */
  --accent-snake-head: #1e293b;
  --accent-snake-body: #334155;
  --accent-snake-tail: #475569;
  --accent-tongue: #dc2626;

  /* Tasteful, Harmonious Accents (NO violet/purple AI colors) */
  --accent-apple: #dc2626;       /* Crisp ruby red apple */
  --accent-apple-leaf: #16a34a;  /* Natural leaf green */
  --accent-star: #d97706;        /* Warm amber golden fruit */
  --accent-berry: #0284c7;       /* Ice blue freeze berry */
  --accent-danger: #ef4444;      /* Danger alerts */
  --accent-success: #10b981;     /* Success badges */

  /* Achievement Tier Colors */
  --tier-bronze-bg: #fffbeb;
  --tier-bronze-border: #fde68a;
  --tier-bronze-text: #b45309;
  
  --tier-silver-bg: #f8fafc;
  --tier-silver-border: #cbd5e1;
  --tier-silver-text: #475569;

  --tier-gold-bg: #fefce8;
  --tier-gold-border: #fef08a;
  --tier-gold-text: #a16207;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Shadows (Minimal, crisp, zero neon/glow) */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 140ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 220ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Board Grid Size Variable */
  --grid-size: 20;
}

/* --------------------------------------------------------------------------
   Snake Skin Themes (Selected in Settings)
   -------------------------------------------------------------------------- */
[data-snake-skin="emerald"] {
  --accent-snake-head: #065f46;
  --accent-snake-body: #047857;
  --accent-snake-tail: #059669;
}
[data-snake-skin="cobalt"] {
  --accent-snake-head: #1e3a8a;
  --accent-snake-body: #1d4ed8;
  --accent-snake-tail: #2563eb;
}
[data-snake-skin="amber"] {
  --accent-snake-head: #92400e;
  --accent-snake-body: #b45309;
  --accent-snake-tail: #d97706;
}
[data-snake-skin="crimson"] {
  --accent-snake-head: #881337;
  --accent-snake-body: #9f1239;
  --accent-snake-tail: #be123c;
}
[data-snake-skin="sage"] {
  --accent-snake-head: #365314;
  --accent-snake-body: #4d7c0f;
  --accent-snake-tail: #65a30d;
}

/* --------------------------------------------------------------------------
   2. Reset & Base Typography
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  color-scheme: light;
  height: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-secondary);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   3. Mobile Landscape Blocker
   -------------------------------------------------------------------------- */
.orientation-blocker {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999999;
  background-color: var(--bg-page);
  padding: 2rem;
  text-align: center;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.orientation-blocker-content {
  max-width: 380px;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
}

.orientation-icon {
  font-size: 3rem;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  animation: rotatePhone 2.5s infinite ease-in-out;
}

.orientation-blocker h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.orientation-blocker p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@keyframes rotatePhone {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-90deg); }
}

@media (max-width: 900px) and (max-height: 520px) and (orientation: landscape),
       (max-width: 767px) and (orientation: landscape) {
  .orientation-blocker {
    display: flex !important;
  }
}

/* --------------------------------------------------------------------------
   4. App Shell & Header (Precision Logo Alignment)
   -------------------------------------------------------------------------- */
.app-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 0 1.25rem;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  user-select: none;
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background-color: var(--text-primary);
  color: var(--text-inverse);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.btn-icon {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--border-strong);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn-icon:active { transform: translateY(0); }

.icon-sub-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--accent-star);
  color: #ffffff;
  font-size: 0.62rem;
  font-weight: 800;
  padding: 1px 5px;
  border-radius: var(--radius-full);
  line-height: 1.2;
}

/* Color Helper Utilities */
.text-amber { color: var(--accent-star) !important; }
.text-crimson { color: var(--accent-apple) !important; }
.text-emerald { color: var(--accent-apple-leaf) !important; }
.text-danger { color: var(--accent-danger) !important; }
.text-muted { color: var(--text-muted) !important; }

/* --------------------------------------------------------------------------
   5. Main Layout & Quick Stats
   -------------------------------------------------------------------------- */
.game-layout {
  display: flex;
  flex: 1;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
}

.board-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  max-width: 560px;
  width: 100%;
}

.sidebar-column {
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

/* Mobile Quick Stats */
.mobile-stats-bar {
  display: none;
  width: 100%;
  max-width: 440px;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem;
  margin-bottom: 0.5rem;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

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

.mini-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.mini-value {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.mini-value.badge-speed {
  font-size: 0.72rem;
  background: var(--bg-surface-subtle);
  padding: 0.12rem 0.45rem;
  border-radius: var(--radius-sm);
  margin-top: 1px;
}

/* --------------------------------------------------------------------------
   6. Game Board Frame & Styling
   -------------------------------------------------------------------------- */
.board-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 530px;
  max-height: 530px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-board);
  padding: 6px;
  border: 1px solid var(--border-strong);
  overflow: hidden;
  user-select: none;
  touch-action: none;
  transition: opacity 180ms ease, visibility 180ms ease;
}

body.modal-open .board-frame {
  filter: blur(1.5px);
  transition: filter var(--transition-fast);
}

.game-board {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--bg-board);
  border-radius: calc(var(--radius-xl) - 4px);
  overflow: hidden;
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
  background-size: calc(100% / var(--grid-size)) calc(100% / var(--grid-size));
}

.buff-banner {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  box-shadow: var(--shadow-sm);
  pointer-events: none;
  z-index: 30;
  animation: slideDown 180ms ease;
}

@keyframes slideDown {
  from { transform: translate(-50%, -10px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

.countdown-overlay {
  position: absolute;
  inset: 0;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(4px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  border-radius: calc(var(--radius-xl) - 4px);
}

.countdown-number {
  font-size: 5.5rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.countdown-number.anim-pop {
  animation: countdownPop 0.72s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.countdown-label {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

@keyframes countdownPop {
  0% { transform: scale(0.5); opacity: 0; }
  35% { transform: scale(1.15); opacity: 1; }
  65% { transform: scale(1); opacity: 1; }
  100% { transform: scale(0.92); opacity: 0.85; }
}

/* --------------------------------------------------------------------------
   6b. In-Board Pause Overlay (Borderless, Soft Optical Blur, Authentic Feel)
   -------------------------------------------------------------------------- */
.pause-overlay {
  position: absolute;
  inset: 0;
  background: rgba(248, 250, 252, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 45;
  border-radius: calc(var(--radius-xl) - 4px);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  animation: pauseFadeIn 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes pauseFadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.inboard-pause-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
  padding: 1.5rem;
}

.inboard-pause-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(15, 23, 42, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
  animation: pulsePauseIcon 2s ease-in-out infinite;
}

@keyframes pulsePauseIcon {
  0%, 100% { transform: scale(1); opacity: 0.95; }
  50% { transform: scale(1.08); opacity: 0.55; }
}

.inboard-pause-title {
  font-size: 2.25rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--text-primary);
  margin: 0;
  line-height: 1;
  text-transform: uppercase;
}

.inboard-pause-hint {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 0.85rem;
  margin-bottom: 0;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.inboard-pause-hint kbd {
  background: rgba(15, 23, 42, 0.08);
  color: var(--text-primary);
  padding: 0.18rem 0.48rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(15, 23, 42, 0.12);
  font-size: 0.72rem;
  font-family: inherit;
  font-weight: 700;
}

/* Desktop Shortcuts Reference Bar */
.board-shortcuts-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem 0.85rem;
  margin-top: 0.75rem;
  padding: 0.4rem 0.75rem;
}

.shortcut-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}

.shortcut-tag kbd,
.kbd-sidebar-pill {
  font-family: inherit;
  font-size: 0.65rem;
  font-weight: 700;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 0.12rem 0.4rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
  line-height: 1;
}

/* --------------------------------------------------------------------------
   7. Snake & Entities Styling (Persistent & Animated Tongue)
   -------------------------------------------------------------------------- */
.snake-segment {
  position: absolute;
  box-sizing: border-box;
  background-color: var(--accent-snake-body);
  border-radius: 4px;
  z-index: 10;
  transition: transform 50ms linear;
}

.snake-head {
  background-color: var(--accent-snake-head);
  z-index: 15;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible !important;
}

.snake-head.dir-right { border-radius: 4px 10px 10px 4px; }
.snake-head.dir-left  { border-radius: 10px 4px 4px 10px; }
.snake-head.dir-up    { border-radius: 10px 10px 4px 4px; }
.snake-head.dir-down  { border-radius: 4px 4px 10px 10px; }

.snake-eyes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.snake-eye {
  position: absolute;
  width: 26%;
  height: 26%;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}

.snake-eye::after {
  content: '';
  position: absolute;
  width: 55%;
  height: 55%;
  background: #0f172a;
  border-radius: 50%;
}

.dir-right .snake-eye-1 { top: 16%; right: 24%; }
.dir-right .snake-eye-2 { bottom: 16%; right: 24%; }
.dir-right .snake-eye::after { right: 8%; top: 22%; }

.dir-left .snake-eye-1 { top: 16%; left: 24%; }
.dir-left .snake-eye-2 { bottom: 16%; left: 24%; }
.dir-left .snake-eye::after { left: 8%; top: 22%; }

.dir-up .snake-eye-1 { top: 24%; left: 16%; }
.dir-up .snake-eye-2 { top: 24%; right: 16%; }
.dir-up .snake-eye::after { top: 8%; left: 22%; }

.dir-down .snake-eye-1 { bottom: 24%; left: 16%; }
.dir-down .snake-eye-2 { bottom: 24%; right: 16%; }
.dir-down .snake-eye::after { bottom: 8%; left: 22%; }

/* Snake Tongue */
.snake-tongue {
  position: absolute;
  background-color: var(--accent-tongue);
  z-index: 25;
  pointer-events: none;
}

.dir-right .snake-tongue {
  left: 100%;
  top: 50%;
  margin-top: -1.5px;
  width: 58%;
  height: 3px;
  transform-origin: left center;
  animation: tongueFlickRight 1.4s infinite ease-in-out;
}
.dir-right .snake-tongue::before,
.dir-right .snake-tongue::after {
  content: '';
  position: absolute;
  right: -4px;
  width: 5px;
  height: 2px;
  background-color: var(--accent-tongue);
}
.dir-right .snake-tongue::before { top: -2px; transform: rotate(32deg); }
.dir-right .snake-tongue::after { bottom: -2px; transform: rotate(-32deg); }

.dir-left .snake-tongue {
  right: 100%;
  top: 50%;
  margin-top: -1.5px;
  width: 58%;
  height: 3px;
  transform-origin: right center;
  animation: tongueFlickLeft 1.4s infinite ease-in-out;
}
.dir-left .snake-tongue::before,
.dir-left .snake-tongue::after {
  content: '';
  position: absolute;
  left: -4px;
  width: 5px;
  height: 2px;
  background-color: var(--accent-tongue);
}
.dir-left .snake-tongue::before { top: -2px; transform: rotate(-32deg); }
.dir-left .snake-tongue::after { bottom: -2px; transform: rotate(32deg); }

.dir-up .snake-tongue {
  bottom: 100%;
  left: 50%;
  margin-left: -1.5px;
  width: 3px;
  height: 58%;
  transform-origin: center bottom;
  animation: tongueFlickUp 1.4s infinite ease-in-out;
}
.dir-up .snake-tongue::before,
.dir-up .snake-tongue::after {
  content: '';
  position: absolute;
  top: -4px;
  width: 2px;
  height: 5px;
  background-color: var(--accent-tongue);
}
.dir-up .snake-tongue::before { left: -2px; transform: rotate(-32deg); }
.dir-up .snake-tongue::after { right: -2px; transform: rotate(32deg); }

.dir-down .snake-tongue {
  top: 100%;
  left: 50%;
  margin-left: -1.5px;
  width: 3px;
  height: 58%;
  transform-origin: center top;
  animation: tongueFlickDown 1.4s infinite ease-in-out;
}
.dir-down .snake-tongue::before,
.dir-down .snake-tongue::after {
  content: '';
  position: absolute;
  bottom: -4px;
  width: 2px;
  height: 5px;
  background-color: var(--accent-tongue);
}
.dir-down .snake-tongue::before { left: -2px; transform: rotate(32deg); }
.dir-down .snake-tongue::after { right: -2px; transform: rotate(-32deg); }

@keyframes tongueFlickRight {
  0%, 20% { transform: scaleX(0); opacity: 0; }
  28% { transform: scaleX(1); opacity: 1; }
  34% { transform: scaleX(0.75) rotate(5deg); opacity: 1; }
  40% { transform: scaleX(1.15) rotate(-5deg); opacity: 1; }
  46% { transform: scaleX(0.85) rotate(4deg); opacity: 1; }
  54% { transform: scaleX(1.05) rotate(0deg); opacity: 1; }
  62% { transform: scaleX(0); opacity: 0; }
  100% { transform: scaleX(0); opacity: 0; }
}

@keyframes tongueFlickLeft {
  0%, 20% { transform: scaleX(0); opacity: 0; }
  28% { transform: scaleX(1); opacity: 1; }
  34% { transform: scaleX(0.75) rotate(-5deg); opacity: 1; }
  40% { transform: scaleX(1.15) rotate(5deg); opacity: 1; }
  46% { transform: scaleX(0.85) rotate(-4deg); opacity: 1; }
  54% { transform: scaleX(1.05) rotate(0deg); opacity: 1; }
  62% { transform: scaleX(0); opacity: 0; }
  100% { transform: scaleX(0); opacity: 0; }
}

@keyframes tongueFlickUp {
  0%, 20% { transform: scaleY(0); opacity: 0; }
  28% { transform: scaleY(1); opacity: 1; }
  34% { transform: scaleY(0.75) rotate(5deg); opacity: 1; }
  40% { transform: scaleY(1.15) rotate(-5deg); opacity: 1; }
  46% { transform: scaleY(0.85) rotate(4deg); opacity: 1; }
  54% { transform: scaleY(1.05) rotate(0deg); opacity: 1; }
  62% { transform: scaleY(0); opacity: 0; }
  100% { transform: scaleY(0); opacity: 0; }
}

@keyframes tongueFlickDown {
  0%, 20% { transform: scaleY(0); opacity: 0; }
  28% { transform: scaleY(1); opacity: 1; }
  34% { transform: scaleY(0.75) rotate(-5deg); opacity: 1; }
  40% { transform: scaleY(1.15) rotate(5deg); opacity: 1; }
  46% { transform: scaleY(0.85) rotate(-4deg); opacity: 1; }
  54% { transform: scaleY(1.05) rotate(0deg); opacity: 1; }
  62% { transform: scaleY(0); opacity: 0; }
  100% { transform: scaleY(0); opacity: 0; }
}

.snake-tail {
  background-color: var(--accent-snake-tail);
  border-radius: 50%;
  transform: scale(0.85);
}

/* Food Items */
.food-item {
  position: absolute;
  z-index: 12;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: transform 120ms ease;
}

.food-apple {
  background: radial-gradient(circle at 35% 35%, #ef4444, #dc2626 70%, #991b1b);
  border-radius: 50% 50% 45% 45%;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.15);
}

.food-apple::before {
  content: '';
  position: absolute;
  top: -18%;
  right: 25%;
  width: 32%;
  height: 38%;
  background: var(--accent-apple-leaf);
  border-radius: 0 85% 0 85%;
  transform: rotate(25deg);
}

.food-apple::after {
  content: '';
  position: absolute;
  top: -12%;
  left: 45%;
  width: 12%;
  height: 22%;
  background: #78350f;
  border-radius: 2px;
  transform: rotate(-10deg);
}

.food-star {
  background: radial-gradient(circle at 35% 35%, #fbbf24, #d97706 70%, #b45309);
  border-radius: 35%;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.15);
  animation: starBob 1.2s infinite ease-in-out;
}

.food-star::after {
  content: '';
  position: absolute;
  inset: 2px;
  border: 1.5px solid rgba(255, 255, 255, 0.65);
  border-radius: 30%;
}

@keyframes starBob {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

.food-berry {
  background: radial-gradient(circle at 35% 35%, #38bdf8, #0284c7 70%, #0369a1);
  border-radius: 45%;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.15);
  animation: berryPulse 1.4s infinite ease-in-out;
}

@keyframes berryPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(0.92); }
}

/* --------------------------------------------------------------------------
   8. Floating Score Badges (High Contrast & Clamped)
   -------------------------------------------------------------------------- */
.floating-score {
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 45;
  white-space: nowrap;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: #ffffff;
  color: var(--text-primary);
  border: 1.5px solid var(--border-strong);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.12);
  animation: floatUpFade 0.85s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.floating-score.bonus-pill {
  background: #fffbeb;
  color: #92400e;
  border-color: #f59e0b;
}

.floating-score.chill-pill {
  background: #f0f9ff;
  color: #0369a1;
  border-color: #38bdf8;
}

@keyframes floatUpFade {
  0%   { transform: translate(-50%, -20%) scale(0.85); opacity: 0; }
  22%  { transform: translate(-50%, -50%) scale(1.06); opacity: 1; }
  70%  { transform: translate(-50%, -90%) scale(1); opacity: 1; }
  100% { transform: translate(-50%, -130%) scale(0.92); opacity: 0; }
}

/* --------------------------------------------------------------------------
   9. Touch Controls
   -------------------------------------------------------------------------- */
.touch-controls {
  display: none;
  margin-top: 0.75rem;
  width: 100%;
  max-width: 320px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.dpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  width: 210px;
  height: 210px;
  margin: 0 auto;
}

.dpad-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  touch-action: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  transition: background-color var(--transition-fast), transform 70ms ease;
}

.dpad-btn:active {
  background-color: var(--bg-board);
  transform: scale(0.92);
}

.dpad-center {
  background-color: var(--bg-surface-subtle);
  font-size: 1.1rem;
  border-radius: 50%;
}

.cell-empty { pointer-events: none; }

/* --------------------------------------------------------------------------
   10. Sidebar Cards & Quick Actions
   -------------------------------------------------------------------------- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.card-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stat-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  color: var(--text-primary);
}

.speed-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  color: var(--text-primary);
}

.score-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-light);
}

.score-item { display: flex; flex-direction: column; }
.score-label { font-size: 0.7rem; font-weight: 600; color: var(--text-muted); }
.score-number {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.score-divider {
  width: 1px;
  height: 36px;
  background-color: var(--border-strong);
}

/* Combo Meter */
.combo-wrapper {
  margin-top: 0.75rem;
  transition: opacity var(--transition-normal);
}

.combo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.combo-badge {
  font-weight: 800;
  color: var(--accent-star);
  font-size: 0.85rem;
}

.combo-meter {
  height: 6px;
  background: var(--bg-surface-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.combo-fill {
  height: 100%;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: width 100ms linear, background-color 200ms ease;
}

.combo-fill.combo-x2 { background: #d97706; }
.combo-fill.combo-x3 { background: #059669; }
.combo-fill.combo-x4 { background: #0284c7; }
.combo-fill.combo-x5 { background: #dc2626; }

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  margin-top: 0.4rem;
}

.metric-item {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.metric-icon { font-size: 1rem; color: var(--text-muted); }
.metric-details { display: flex; flex-direction: column; }
.metric-val {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.metric-name { font-size: 0.65rem; font-weight: 600; color: var(--text-muted); }

/* Quick Actions Card (Achievements & Help in Sidebar) */
.quick-actions-card {
  padding: 0.4rem 0.65rem;
}

.quick-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.5rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.quick-action-row:hover {
  background: var(--bg-surface-subtle);
}

.quick-action-info {
  display: flex;
  flex-direction: column;
}

.quick-action-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.quick-action-subtitle {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.quick-action-divider {
  height: 1px;
  background: var(--border-light);
  margin: 0 0.5rem;
}

.action-arrow {
  font-size: 0.75rem;
}

/* Legend */
.legend-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.4rem;
}

.legend-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
}

.legend-keys { display: flex; gap: 0.25rem; align-items: center; }

kbd {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.15);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.12rem 0.35rem;
  color: var(--text-primary);
}

.legend-action { color: var(--text-secondary); font-weight: 500; }

/* --------------------------------------------------------------------------
   11. App Footer
   -------------------------------------------------------------------------- */
.app-footer {
  margin-top: auto;
  padding: 0.55rem 0;
  text-align: center;
  border-top: 1px solid var(--border-light);
  font-size: 0.82rem;
  line-height: 1.3;
  color: var(--text-muted);
  flex-shrink: 0;
}

.app-footer p {
  margin: 0;
  line-height: 1.3;
}

.app-footer a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.app-footer a:hover {
  text-decoration: underline;
  color: #000000;
}

/* --------------------------------------------------------------------------
   12. Dedicated Modal Layer & Backdrop Canvas
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

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

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Ambient Canvas (Subtle Autonomous Slithering Snake) */
.ambient-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1004;
  opacity: 0.07; /* Very faint, atmospheric, zero distraction */
}

.modal-window {
  position: relative;
  z-index: 1010;
  display: none;
  width: 100%;
}

.modal-window.active {
  display: block;
  animation: modalEnter 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalEnter {
  from { transform: translateY(12px) scale(0.98); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-height: min(88vh, 88dvh);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-scrollable {
  /* Class retained for semantic compatibility; inner modal-body handles scrolling */
  overflow: hidden;
}

.modal-header {
  padding: 1.2rem 1.4rem 0.85rem 1.4rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-shrink: 0;
}

.modal-header.text-center {
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.modal-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.modal-body {
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}

.modal-body::-webkit-scrollbar {
  width: 5px;
}

.modal-body::-webkit-scrollbar-track {
  background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

.modal-footer {
  padding: 0.85rem 1.4rem 1.25rem 1.4rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  gap: 0.65rem;
  flex-shrink: 0;
}

.modal-footer.flex-column { flex-direction: column; }

/* --------------------------------------------------------------------------
   13. Redesigned Start Game Screen (Hero Branding & Speed Cards)
   -------------------------------------------------------------------------- */
.modal-window-start {
  max-width: 520px;
}

.modal-window-gameover,
.modal-window-pause {
  max-width: 440px;
  width: 100%;
}

.start-hero-header {
  padding: 1.6rem 1.6rem 0.8rem 1.6rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}

.start-brand-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.start-brand-title {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.start-brand-badge {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: var(--text-primary);
  color: var(--text-inverse);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.start-hero-heading {
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.start-hero-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  max-width: 400px;
  line-height: 1.4;
  margin-bottom: 1rem;
}

.start-stats-ribbon {
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 100%;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.85rem;
}

.ribbon-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.ribbon-item strong {
  color: var(--text-primary);
  font-weight: 800;
}

.ribbon-divider {
  width: 1px;
  height: 20px;
  background: var(--border-strong);
}

.form-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.45rem;
}

.form-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Speed Cards Grid */
.start-speed-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

.start-speed-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 0.85rem 0.95rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.start-speed-card:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--text-primary);
}

.start-speed-card.active {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

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

.speed-card-name {
  font-size: 0.92rem;
  font-weight: 800;
}

.speed-card-tag {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.12rem 0.4rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
}

.start-speed-card.active .speed-card-tag {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.badge-recommended {
  background: rgba(5, 150, 105, 0.12) !important;
  color: #059669 !important;
}

.start-speed-card.active .badge-recommended {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #ffffff !important;
}

.badge-hot {
  background: rgba(220, 38, 38, 0.1) !important;
  color: #dc2626 !important;
}

.start-speed-card.active .badge-hot {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #ffffff !important;
}

.badge-adaptive {
  background: rgba(2, 132, 199, 0.12) !important;
  color: #0284c7 !important;
}

.start-speed-card.active .badge-adaptive {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #ffffff !important;
}

.speed-card-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.start-speed-card.active .speed-card-desc {
  color: rgba(255, 255, 255, 0.75);
}

.btn-lg {
  padding: 0.85rem 1.4rem;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.start-secondary-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.text-link-btn {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.95rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.text-link-btn:hover {
  color: var(--text-primary);
  background: #ffffff;
  border-color: var(--border-strong);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   14. Ultra-Premium Redesigned Settings Modal
   -------------------------------------------------------------------------- */
.modal-window-settings {
  max-width: 500px;
}

/* Live Snake Preview Box */
.settings-preview-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 0.9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.preview-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.preview-label {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.preview-skin-title {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

.preview-snake-track {
  height: 52px;
  background: var(--bg-board);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 0 1.25rem;
  position: relative;
  overflow: hidden;
}

.preview-segment {
  width: 22px;
  height: 22px;
  box-sizing: border-box;
}

.preview-head {
  position: relative;
  background-color: var(--accent-snake-head);
  border-radius: 4px 10px 10px 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-normal);
}

.preview-eyes {
  position: absolute;
  inset: 0;
}

.preview-eye {
  position: absolute;
  width: 6px;
  height: 6px;
  background: #ffffff;
  border-radius: 50%;
}

.preview-eye::after {
  content: '';
  position: absolute;
  width: 3px;
  height: 3px;
  background: #0f172a;
  border-radius: 50%;
  right: 0.5px;
  top: 1px;
}

.preview-eye-1 { top: 3px; right: 5px; }
.preview-eye-2 { bottom: 3px; right: 5px; }

.preview-tongue {
  position: absolute;
  left: 100%;
  top: 50%;
  margin-top: -1.5px;
  width: 12px;
  height: 3px;
  background: var(--accent-tongue);
  transform-origin: left center;
  animation: tongueFlickRight 1.4s infinite ease-in-out;
}
.preview-tongue::before,
.preview-tongue::after {
  content: '';
  position: absolute;
  right: -3px;
  width: 4px;
  height: 2px;
  background: var(--accent-tongue);
}
.preview-tongue::before { top: -1.5px; transform: rotate(30deg); }
.preview-tongue::after { bottom: -1.5px; transform: rotate(-30deg); }

.preview-body {
  background-color: var(--accent-snake-body);
  border-radius: 4px;
  transition: background-color var(--transition-normal);
}

.preview-tail {
  background-color: var(--accent-snake-tail);
  border-radius: 50%;
  transform: scale(0.85);
  transition: background-color var(--transition-normal);
}

.preview-target-apple {
  position: relative;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ef4444, #dc2626 70%, #991b1b);
  margin-left: 28px;
  box-shadow: 0 2px 5px rgba(220, 38, 38, 0.28);
  animation: appleSubtleGlow 2.4s ease-in-out infinite alternate;
}
@keyframes appleSubtleGlow {
  0% { transform: scale(1); }
  100% { transform: scale(1.08); }
}

.preview-target-apple .mini-apple-leaf {
  position: absolute;
  top: -2.5px;
  right: 2px;
  width: 6px;
  height: 8px;
  background: var(--accent-apple-leaf);
  border-radius: 0 80% 0 80%;
  transform: rotate(20deg);
}

/* Settings Group Container */
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.settings-group-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
}

/* Skin Selector Grid Cards */
.skin-selector-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
}

.skin-swatch-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.skin-swatch-card:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.skin-swatch-card.active {
  border-color: var(--text-primary);
  background: #ffffff;
  box-shadow: 0 0 0 1.5px var(--text-primary), 0 2px 6px rgba(15, 23, 42, 0.08);
}

.swatch-disc {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.12);
}

.swatch-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
  text-align: left;
}

.swatch-check {
  font-size: 0.7rem;
  color: var(--text-primary);
  display: none;
}

.skin-swatch-card.active .swatch-check {
  display: block;
}

/* Grouped Card Stack (iOS / macOS Style Rows) */
.settings-card-stack {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-light);
  gap: 0.75rem;
}

.settings-row:last-child {
  border-bottom: none;
}

.settings-row-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.settings-row-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
  border: 1px solid var(--border-light);
}

.settings-row-text {
  display: flex;
  flex-direction: column;
}

.settings-row-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
}

.settings-row-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Segmented Control Buttons */
.segmented-control {
  display: flex;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}

.segment-btn {
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  padding: 0.4rem 0.68rem;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.segment-btn:hover { color: var(--text-primary); }
.segment-btn.active {
  background: var(--text-primary);
  color: #ffffff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.16);
}

/* Danger Section */
.settings-danger-card {
  background: rgba(239, 68, 68, 0.04);
  border: 1px solid rgba(239, 68, 68, 0.18);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.danger-info {
  display: flex;
  flex-direction: column;
}

.danger-title {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent-danger);
}

.danger-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.btn-danger-subtle {
  background: transparent;
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-danger);
  white-space: nowrap;
}

.btn-danger-subtle:hover {
  background: rgba(239, 68, 68, 0.08);
  border-color: var(--accent-danger);
}

.flex-row-buttons {
  display: flex;
  gap: 0.65rem;
  width: 100%;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

/* --------------------------------------------------------------------------
   15. Dedicated "How to Play" Modal (.modal-window-help)
   -------------------------------------------------------------------------- */
.modal-window-help {
  max-width: 520px;
}

.help-tabs-bar {
  display: flex;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
}

.help-tab {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  padding: 0.45rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.help-tab:hover { color: var(--text-primary); }
.help-tab.active {
  background: var(--text-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.help-content-area {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-height: 52vh;
  overflow-y: auto;
  padding-right: 2px;
}

.help-pane {
  display: none;
  flex-direction: column;
  gap: 0.85rem;
}

.help-pane.active {
  display: flex;
  animation: modalEnter 180ms ease-out;
}

.help-guide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.help-card-title {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.help-keys-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

.help-key-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.55rem;
}

.key-badge-wrap { display: flex; gap: 0.25rem; align-items: center; }
.key-desc { font-size: 0.7rem; color: var(--text-muted); }

.help-touch-explainer {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.touch-method-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.method-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.touch-method-item strong {
  display: block;
  font-size: 0.8rem;
  color: var(--text-primary);
}

.touch-method-item p {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* Food Explainer List */
.food-explainer-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.food-explainer-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.food-preview-disc {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.12);
}

.apple-disc {
  background: radial-gradient(circle at 35% 35%, #ef4444, #dc2626 70%, #991b1b);
}

.mini-apple-leaf {
  position: absolute;
  top: -3px;
  right: 6px;
  width: 10px;
  height: 12px;
  background: var(--accent-apple-leaf);
  border-radius: 0 80% 0 80%;
  transform: rotate(25deg);
}

.star-disc {
  background: radial-gradient(circle at 35% 35%, #fbbf24, #d97706 70%, #b45309);
  color: #ffffff;
  font-size: 1rem;
}

.berry-disc {
  background: radial-gradient(circle at 35% 35%, #38bdf8, #0284c7 70%, #0369a1);
  color: #ffffff;
  font-size: 1rem;
}

.food-explainer-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
}

.food-name-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.food-name-row strong {
  font-size: 0.82rem;
  color: var(--text-primary);
}

.food-badge-base {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: rgba(220, 38, 38, 0.08);
  color: #dc2626;
}

.food-badge-bonus {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: rgba(217, 119, 6, 0.1);
  color: #d97706;
}

.food-badge-chill {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: rgba(2, 132, 199, 0.1);
  color: #0284c7;
}

.food-explainer-info p {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.help-text-para {
  font-size: 0.74rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.help-bullet-list {
  padding-left: 1.1rem;
  font-size: 0.73rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   16. Achievements Modal & Cards
   -------------------------------------------------------------------------- */
.modal-window-achievements {
  max-width: 500px;
}

.header-badge-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.badge-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
}

.achieve-filter-bar {
  display: flex;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}

.filter-tab {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  padding: 0.35rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab:hover { color: var(--text-primary); }
.filter-tab.active {
  background: var(--text-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.achievements-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  max-height: 52vh;
  overflow-y: auto;
  padding-right: 2px;
}

.achievements-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.2rem 1.4rem;
  background: var(--bg-surface-subtle);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  margin: 0.5rem 0;
}

.empty-state-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-sm);
}

.empty-state-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.empty-state-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.45;
}

.achievement-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: all var(--transition-fast);
}

.achievement-card.completed {
  border-color: var(--border-strong);
  background: #ffffff;
}

.achievement-card.locked { opacity: 0.65; }

.achievement-medal {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
  border: 1px solid transparent;
}

.achievement-medal.bronze {
  background: var(--tier-bronze-bg);
  border-color: var(--tier-bronze-border);
  color: var(--tier-bronze-text);
}

.achievement-medal.silver {
  background: var(--tier-silver-bg);
  border-color: var(--tier-silver-border);
  color: var(--tier-silver-text);
}

.achievement-medal.gold {
  background: var(--tier-gold-bg);
  border-color: var(--tier-gold-border);
  color: var(--tier-gold-text);
}

.achievement-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.achievement-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 2px;
}

.achievement-name {
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
}

.achievement-tier-tag {
  font-size: 0.6rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 1px 4px;
  border-radius: var(--radius-sm);
}

.achievement-tier-tag.bronze { background: var(--tier-bronze-bg); color: var(--tier-bronze-text); }
.achievement-tier-tag.silver { background: var(--tier-silver-bg); color: var(--tier-silver-text); }
.achievement-tier-tag.gold   { background: var(--tier-gold-bg); color: var(--tier-gold-text); }

.achievement-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.achievement-progress-wrap {
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.achievement-progress-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-surface-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.achievement-progress-fill {
  height: 100%;
  background: var(--accent-star);
  border-radius: var(--radius-full);
  transition: width 200ms ease;
}

.achievement-progress-text {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.achievement-status-badge {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent-success);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* Modern Layered Achievement Toast (Upper Center) */
.achievement-toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  pointer-events: none;
  width: 90%;
  max-width: 400px;
}

.achievement-toast {
  position: relative;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: 
    0 10px 30px -5px rgba(15, 23, 42, 0.12),
    0 4px 12px -2px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  padding: 0.75rem 1.1rem 0.85rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  pointer-events: auto;
  min-width: 280px;
  max-width: 380px;
  overflow: hidden;
  animation: achToastIn 260ms cubic-bezier(0.16, 1, 0.3, 1), achToastOut 240ms ease 3.5s forwards;
}

.achievement-toast.tier-gold {
  border-color: rgba(245, 158, 11, 0.45);
  box-shadow: 
    0 12px 32px -4px rgba(217, 119, 6, 0.18),
    0 4px 12px -2px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.achievement-toast.tier-silver {
  border-color: rgba(148, 163, 184, 0.55);
  box-shadow: 
    0 12px 32px -4px rgba(100, 116, 139, 0.16),
    0 4px 12px -2px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.achievement-toast.tier-bronze {
  border-color: rgba(217, 119, 6, 0.35);
  box-shadow: 
    0 12px 32px -4px rgba(180, 83, 9, 0.14),
    0 4px 12px -2px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.achievement-toast-medal {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 2px 6px rgba(15, 23, 42, 0.08);
}

.achievement-toast-medal.gold {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #b45309;
  border: 1px solid #f59e0b;
}

.achievement-toast-medal.silver {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  color: #475569;
  border: 1px solid #94a3b8;
}

.achievement-toast-medal.bronze {
  background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
  color: #9a3412;
  border: 1px solid #ea580c;
}

.achievement-toast-details {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
}

.achievement-toast-top {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.achievement-toast-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.achievement-toast-tier {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 0.08rem 0.35rem;
  border-radius: var(--radius-full);
}

.achievement-toast.tier-gold .achievement-toast-tier {
  background: rgba(245, 158, 11, 0.15);
  color: #b45309;
}

.achievement-toast.tier-silver .achievement-toast-tier {
  background: rgba(100, 116, 139, 0.12);
  color: #475569;
}

.achievement-toast.tier-bronze .achievement-toast-tier {
  background: rgba(194, 65, 12, 0.12);
  color: #9a3412;
}

.achievement-toast-name {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
}

.achievement-toast-timer {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2.5px;
  width: 100%;
  background: var(--text-primary);
  opacity: 0.25;
  animation: achTimerBar 3.5s linear forwards;
}

.achievement-toast.tier-gold .achievement-toast-timer { background: #f59e0b; opacity: 0.6; }
.achievement-toast.tier-silver .achievement-toast-timer { background: #64748b; opacity: 0.5; }
.achievement-toast.tier-bronze .achievement-toast-timer { background: #ea580c; opacity: 0.5; }

@keyframes achToastIn {
  from { transform: translateY(-24px) scale(0.95); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

@keyframes achToastOut {
  from { transform: translateY(0) scale(1); opacity: 1; }
  to { transform: translateY(-18px) scale(0.95); opacity: 0; }
}

@keyframes achTimerBar {
  from { width: 100%; }
  to { width: 0%; }
}

/* General Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.68rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-sm { padding: 0.42rem 0.75rem; font-size: 0.76rem; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--text-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #1e293b;
  transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.btn-secondary:hover { background: var(--bg-surface-subtle); }

.btn-tertiary {
  background: transparent;
  color: var(--text-secondary);
}

.btn-tertiary:hover { background: var(--bg-surface-subtle); color: var(--text-primary); }

.btn-danger { background: var(--accent-danger); color: #ffffff; }
.btn-danger:hover { background: #dc2626; }

/* Status & Danger Badges */
.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.badge-danger {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #dc2626;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.pause-stats-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.summary-box {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 0.95rem 0.85rem;
  text-align: center;
}

.summary-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.summary-number {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  margin-top: 0.2rem;
}

/* Results Grid & Hero Score Presentation */
.new-record-banner {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(217, 119, 6, 0.15));
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: #b45309;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.gameover-hero-score {
  background: linear-gradient(180deg, var(--bg-surface-subtle) 0%, rgba(241, 245, 249, 0.6) 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1rem 0.95rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero-score-label {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

.hero-score-val {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
}

.hero-score-unit {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  margin-top: 0.25rem;
}

.gameover-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.gameover-stats-grid .result-tile {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.7rem 0.4rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.gameover-stats-grid .tile-icon {
  font-size: 0.85rem;
  margin-bottom: 0.2rem;
}

.gameover-stats-grid .tile-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.1rem;
}

.gameover-stats-grid .tile-number {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* Button Keyboard Hint Tag */
.btn-kbd {
  margin-left: auto;
  font-size: 0.66rem;
  font-family: inherit;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.22);
  color: inherit;
  padding: 0.18rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.3);
  line-height: 1;
}

.btn-secondary .btn-kbd,
.btn-tertiary .btn-kbd {
  background: var(--bg-surface);
  border-color: var(--border-light);
  color: var(--text-muted);
}

.notice-box {
  background: rgba(217, 119, 6, 0.08);
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.8rem;
  font-size: 0.76rem;
  color: #92400e;
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  line-height: 1.35;
}

/* Dialog & Toasts */
.confirm-dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.confirm-dialog-overlay.active { display: flex; animation: modalEnter 180ms ease-out; }

.confirm-dialog-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  max-width: 370px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}

.confirm-title { font-size: 1.15rem; font-weight: 800; color: var(--text-primary); margin-bottom: 0.4rem; }
.confirm-message { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.4; margin-bottom: 1.15rem; }
.confirm-actions { display: flex; justify-content: flex-end; gap: 0.5rem; }

.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
  width: 90%;
  max-width: 420px;
}

.toast {
  background: var(--text-primary);
  color: var(--text-inverse);
  padding: 0.7rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: var(--shadow-lg);
  animation: toastIn 200ms cubic-bezier(0.16, 1, 0.3, 1), toastOut 200ms ease 2.8s forwards;
  pointer-events: auto;
}

@keyframes toastIn {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

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

/* --------------------------------------------------------------------------
   17. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (min-width: 1025px) {
  body { overflow: hidden; }

  .app-container {
    height: 100vh;
    height: 100dvh;
    justify-content: space-between;
  }

  .game-layout {
    flex: 1;
    align-items: center;
    max-height: calc(100vh - 110px);
  }

  .board-frame {
    width: min(520px, calc(100vh - 150px));
    height: min(520px, calc(100vh - 150px));
  }

  .sidebar-column {
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    scrollbar-width: none;
  }
  .sidebar-column::-webkit-scrollbar { display: none; }

  .board-column {
    position: relative;
    justify-content: center;
  }

  .board-shortcuts-bar {
    position: absolute;
    top: calc(100% + 0.45rem);
    left: 0;
    right: 0;
    margin-top: 0;
    width: 100%;
    pointer-events: none;
  }

  .touch-controls { display: none !important; }

  .web-only-shortcuts { display: flex !important; }
  .web-only-hint { display: flex !important; }
  .touch-only-hint { display: none !important; }
}

@media (min-width: 1025px) and (max-height: 780px) {
  .app-container { padding: 0 0.85rem; }
  .app-header { padding: 0.45rem 0; margin-bottom: 0.35rem; }
  .app-footer { padding: 0.45rem 0; }
  .board-frame {
    width: min(440px, calc(100vh - 130px));
    height: min(440px, calc(100vh - 130px));
  }
  .board-shortcuts-bar {
    top: calc(100% + 0.25rem);
  }
  .sidebar-column { width: 290px; gap: 0.5rem; }
  .card { padding: 0.7rem; }
  .score-number { font-size: 1.4rem; }
  .metric-val { font-size: 0.92rem; }
  .legend-list { gap: 0.28rem; }
  .legend-row { font-size: 0.72rem; }
}

/* Strict Non-Web Mode: All Tablets and Mobile Devices (<= 1024px) */
@media (max-width: 1024px) {
  .web-only-shortcuts,
  .board-shortcuts-bar,
  .btn-kbd,
  .web-only-hint,
  .kbd-sidebar-pill {
    display: none !important;
  }
  .touch-only-hint {
    display: flex !important;
  }
}

/* Tablet (768px to 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
  body {
    overflow: hidden;
  }

  .app-container {
    height: 100vh;
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    padding: 0 1rem;
    justify-content: space-between;
  }

  /* Tablet Landscape (iPad landscape, 1024x768, etc.) */
  @media (orientation: landscape) {
    .app-header {
      padding: 0.45rem 0;
      margin-bottom: 0.3rem;
    }

    .game-layout {
      flex-direction: row;
      gap: 1.25rem;
      align-items: center;
      justify-content: center;
      flex: 1;
      min-height: 0;
    }

    .board-column {
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 1.25rem;
      justify-content: center;
    }

    .touch-controls {
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0;
      order: -1; /* D-pad on the left for left thumb, board in center */
    }

    .dpad-grid {
      width: 154px;
      height: 154px;
      gap: 5px;
    }

    .board-frame {
      width: min(390px, calc(100dvh - 110px), 42vw);
      height: min(390px, calc(100dvh - 110px), 42vw);
    }

    .sidebar-column {
      width: 270px;
      gap: 0.5rem;
      max-height: calc(100dvh - 110px);
      overflow-y: auto;
      scrollbar-width: none;
    }
    .sidebar-column::-webkit-scrollbar { display: none; }

    .legend-card {
      display: none;
    }

    .mobile-stats-bar {
      display: none !important;
    }

    .app-footer {
      padding: 0.45rem 0;
      font-size: 0.72rem;
      line-height: 1.3;
    }
  }

  /* Tablet Portrait (iPad portrait, 768x1024, etc.) */
  @media (orientation: portrait) {
    .app-header {
      padding: 0.5rem 0;
      margin-bottom: 0.4rem;
    }

    .game-layout {
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 0.45rem;
      flex: 1;
      min-height: 0;
    }

    .board-column {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
    }

    .mobile-stats-bar {
      display: flex;
      width: 100%;
      max-width: 440px;
      margin-bottom: 0.4rem;
      padding: 0.45rem 1rem;
    }

    .board-frame {
      width: min(430px, calc(100dvh - 350px), 78vw);
      height: min(430px, calc(100dvh - 350px), 78vw);
    }

    .touch-controls {
      display: block;
      margin-top: 0.45rem;
    }

    .dpad-grid {
      width: 165px;
      height: 165px;
      gap: 6px;
    }

    .sidebar-column {
      display: none !important;
    }

    .app-footer {
      padding: 0.5rem 0;
      font-size: 0.75rem;
      line-height: 1.3;
    }
  }
}

/* Mobile (Phones: <= 767px) */
@media (max-width: 767px) {
  body {
    overflow: hidden;
  }

  .app-container {
    height: 100vh;
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    padding: 0 0.65rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  .app-header {
    padding: 0.35rem 0;
    margin-bottom: 0.25rem;
  }

  .brand-title {
    font-size: 1.3rem;
  }

  .header-actions {
    gap: 0.35rem;
  }

  .btn-icon {
    width: 34px;
    height: 34px;
    font-size: 0.88rem;
  }

  .game-layout {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    flex: 1;
    min-height: 0;
  }

  .board-column {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .board-shortcuts-bar {
    display: none !important;
  }

  .mobile-stats-bar {
    display: flex;
    width: 100%;
    max-width: 350px;
    margin-bottom: 0.25rem;
    padding: 0.35rem 0.65rem;
  }

  .mini-label {
    font-size: 0.58rem;
  }

  .mini-value {
    font-size: 0.88rem;
  }

  .board-frame {
    width: min(340px, 86vw, calc(100dvh - 275px));
    height: min(340px, 86vw, calc(100dvh - 275px));
    min-width: 210px;
    min-height: 210px;
  }

  .touch-controls {
    display: block;
    margin-top: 0.35rem;
    flex-shrink: 0;
  }

  .dpad-grid {
    width: 148px;
    height: 148px;
    gap: 5px;
  }

  .dpad-btn {
    font-size: 1.05rem;
    border-radius: var(--radius-md);
  }

  .sidebar-column {
    display: none !important;
  }

  .app-footer {
    padding: 0.35rem 0;
    font-size: 0.72rem;
    line-height: 1.3;
  }
}

/* Short Height Mobile (e.g. In-App WebViews or Small Devices) */
@media (max-width: 767px) and (max-height: 620px) {
  .app-container {
    padding: 0 0.5rem;
  }

  .app-header {
    padding: 0.2rem 0;
    margin-bottom: 0.15rem;
  }

  .brand-title {
    font-size: 1.15rem;
  }

  .btn-icon {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
  }

  .mobile-stats-bar {
    padding: 0.25rem 0.5rem;
    margin-bottom: 0.15rem;
  }

  .board-frame {
    width: min(265px, calc(100dvh - 230px));
    height: min(265px, calc(100dvh - 230px));
    min-width: 180px;
    min-height: 180px;
  }

  .touch-controls {
    margin-top: 0.25rem;
  }

  .dpad-grid {
    width: 136px;
    height: 136px;
    gap: 4px;
  }

  .dpad-btn {
    font-size: 0.95rem;
  }

  .app-footer {
    display: none;
  }
}

/* Mobile Modals, Preferences & Details Polish (<= 520px) */
@media (max-width: 520px) {
  .modal-overlay {
    padding: 0.5rem;
  }

  .modal-window {
    max-width: min(95vw, 420px);
    width: 100%;
  }

  .modal-card {
    border-radius: var(--radius-lg);
    max-height: min(90vh, 90dvh);
    overflow: hidden;
  }

  .modal-header {
    padding: 0.85rem 1rem 0.65rem 1rem;
  }

  .modal-title {
    font-size: 1.15rem;
  }

  .modal-subtitle {
    font-size: 0.74rem;
  }

  .modal-body {
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .modal-footer {
    padding: 0.65rem 1rem 0.85rem 1rem;
  }

  .start-hero-header {
    padding: 0.85rem 1rem 0.4rem 1rem;
  }

  .start-hero-heading {
    font-size: 1.2rem;
  }

  .start-hero-subtitle {
    font-size: 0.74rem;
  }

  .start-stats-ribbon {
    padding: 0.4rem 0.6rem;
    gap: 0.5rem;
  }

  .ribbon-item {
    font-size: 0.72rem;
    gap: 0.35rem;
  }

  .start-speed-cards {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .start-speed-card {
    padding: 0.65rem 0.8rem;
  }

  .speed-card-top {
    margin-bottom: 0.2rem;
  }

  .speed-card-desc {
    font-size: 0.72rem;
  }

  .skin-selector-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.45rem;
  }

  .skin-swatch-card {
    padding: 0.45rem 0.65rem;
  }

  .settings-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.45rem;
  }

  .settings-row .segmented-control {
    width: 100%;
    display: flex;
    justify-content: space-between;
  }

  .settings-row .segment-btn {
    flex: 1;
    text-align: center;
    padding: 0.42rem 0.25rem;
    font-size: 0.72rem;
  }

  .settings-preview-card {
    padding: 0.65rem 0.85rem;
  }

  .preview-snake-track {
    height: 38px;
  }

  .settings-danger-card {
    flex-direction: column;
    align-items: stretch;
    gap: 0.55rem;
  }

  .settings-danger-card .btn {
    width: 100%;
    justify-content: center;
  }

  .help-keys-grid {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .filter-tab {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }

  .achieve-filter-bar {
    gap: 0.35rem;
  }

  .help-tabs-bar {
    gap: 2px;
    padding: 2px;
  }

  .help-tab {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 440px) {
  .start-speed-cards {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }
  .start-speed-card {
    padding: 0.6rem 0.75rem;
  }
}