:root {
    --bg: #050712;
    --panel: #141827;
    --panel-soft: #1b2032;
    /* GREEN MASTER THEME */
    --accent: #22e57f;
    --accent-soft: #59ff84;
    --accent-blue: #22e57f; 
    --accent-yellow: #ffd100;
    --danger: #ff4f70;
    --text-main: #f5f5f7;
    --text-muted: #a2a7c2;
    --border-subtle: #30364c;
    
    /* Shared Color Palette */
    --c-green: #59FF84;
    --c-neon-orange: #FF9F2E;
    --c-red: #FF4F70;
  
    /* Tile dimensions (horizontal pill) — tuned to avoid overflow */
    --tile-width: 44px;
    --tile-height: 28px;
  
    --gap: 8px;
  
    --shadow-soft: 0 14px 40px rgba(0, 0, 0, 0.4);
    --transition-fast: 0.16s ease-out;
    --transition-med: 0.22s ease-out;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  html,
  body {
    margin: 0;
    padding: 0; 
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
      "Segoe UI", sans-serif;
    color: var(--text-main);
    background-color: #050712;
    
    /* --- CENTERING MAGIC --- */
    display: flex;
    flex-direction: column;
  }
  
  /* --- FIXED BACKGROUND (Star Field - Continuous) --- */
  .fixed-background {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0; 
    background-color: #020205; /* Deep Black - No Nebula */
    overflow: hidden;
    pointer-events: none; 
  }
  
  /* Layer 1: Small stars (Background) */
  .fixed-background::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: 
      radial-gradient(circle at 25px 5px, white 1px, transparent 1.5px),
      radial-gradient(circle at 50px 25px, rgba(255,255,255,0.8) 1px, transparent 1.5px),
      radial-gradient(circle at 125px 20px, white 1px, transparent 1.5px),
      radial-gradient(circle at 200px 65px, rgba(255,255,255,0.6) 1px, transparent 1.5px),
      radial-gradient(circle at 300px 10px, white 1px, transparent 1.5px),
      radial-gradient(circle at 360px 45px, rgba(255,255,255,0.9) 1px, transparent 1.5px);
    background-size: 400px 400px;
    opacity: 0.6; 
    /* CHANGED: Continuous Loop matching background size 400px */
    animation: starIntro 40s linear infinite;
  }
  
  /* Layer 2: Brighter/Larger stars (Foreground) */
  .fixed-background::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: 
      radial-gradient(circle at 75px 100px, white 1.5px, transparent 2.5px),
      radial-gradient(circle at 150px 250px, white 1px, transparent 2px),
      radial-gradient(circle at 320px 380px, white 1.5px, transparent 2.5px);
    background-size: 550px 550px; 
    opacity: 0.8; 
    /* CHANGED: Continuous Loop matching background size 550px */
    animation: starIntroFast 30s linear infinite;
  }
  
  @keyframes starIntro {
    from { background-position: 0 0; }
    to { background-position: 0 400px; } /* Loops perfectly at 400px */
  }
  
  @keyframes starIntroFast {
    from { background-position: 0 0; }
    to { background-position: 0 550px; } /* Loops perfectly at 550px */
  }
  
  /* --- CENTER WRAPPER --- */
  .center-wrapper {
    margin: auto; 
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 8px; 
    position: relative;
    z-index: 1; 
  }
  
  /* ===== SPLASH OVERLAY ===== */
  
  .splash-overlay {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at top, #050712 0, #02040a 55%, #000 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    visibility: visible;
    transform: scale(1);
    filter: blur(0);
    transition:
      opacity 0.55s ease-out,
      visibility 0.55s ease-out,
      transform 0.55s ease-out,
      filter 0.55s ease-out;
  }
  
  .splash-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    transform: scale(1.03);
    filter: blur(4px);
    pointer-events: none;
    display: flex !important; 
  }
  .splash-inner {
    position: relative;
    max-width: 420px;
    width: calc(100% - 32px);
    border-radius: 24px;
    overflow: hidden;
    background: #02030a;
    box-shadow:
      0 0 0 1px rgba(26, 169, 255, 0.7),
      0 0 26px rgba(26, 169, 255, 0.85),
      0 30px 80px rgba(0, 0, 0, 0.95);
  }
  
  .splash-image {
    display: block;
    width: 100%;
    height: auto;
  }
  
  .splash-start-btn {
    position: absolute;
    bottom: 10px; 
    left: 50%;
    transform: translateX(-50%);
    border-radius: 999px;
    border: 1px solid rgba(26, 169, 255, 0.95);
    padding: 7px 20px; 
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    background: radial-gradient(circle at 30% 20%, #46f4ff, #1770ff);
    color: #050712;
    box-shadow:
      0 0 14px rgba(70, 244, 255, 0.9),
      0 0 32px rgba(23, 112, 255, 0.85);
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
  }
  
  .splash-start-btn:hover {
    transform: translateX(-50%) translateY(-1px) scale(1.02);
    box-shadow:
      0 0 20px rgba(70, 244, 255, 1),
      0 0 44px rgba(23, 112, 255, 0.95);
  }
  
  .splash-start-btn:active {
    transform: translateX(-50%) translateY(1px) scale(0.97);
  }
  
  /* GENERAL */
  
  .hidden {
    display: none !important;
  }
  
  /* ===== GAME SHELL ===== */
  
  .game-shell {
    width: 100%;
    max-width: 460px;
    padding: 18px 14px 28px;
    margin: 0;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 26px;
    position: relative;
    z-index: 1; 
    box-shadow:
      0 0 0 1px rgba(34, 229, 127, 0.25), 
      0 0 18px rgba(0, 0, 0, 0.9);
    overflow: hidden;
  }
  
  .game-shell.neon-active {
    box-shadow:
      0 0 0 1px rgba(34, 229, 127, 0.55),
      0 0 24px rgba(34, 229, 127, 0.85),
      0 24px 70px rgba(0, 0, 0, 0.95);
  }
  
  .game-shell.neon-active::before {
    content: "";
    position: absolute;
    inset: 6px;
    border-radius: 20px;
    border: 1px solid rgba(34, 229, 127, 0.6);
    box-shadow:
      0 0 14px rgba(34, 229, 127, 0.9),
      0 0 32px rgba(34, 229, 127, 0.7);
    pointer-events: none;
  }
  
  .game-shell.neon-active::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 26px;
    border: 1px solid rgba(34, 229, 127, 0.3);
    opacity: 0.7;
    pointer-events: none;
  }
  
  .game-shell > * {
    position: relative;
    z-index: 2; 
  }
  
  /* CONFETTI CANVAS */
  .confetti-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
  }
  
  /* Header */
  
  .header {
    text-align: center;
    margin-bottom: 6px;
  }
  
  .header h1 {
    margin: 0 0 4px;
    letter-spacing: 0.2em;
    font-weight: 800;
    font-size: 1.8rem;
  }
  
  .tagline {
    margin: 0;
    font-size: 0.78rem;
    color: var(--text-muted);
  }
  
  /* How to play tiny helper */
  
  .howto-btn {
    margin-top: 6px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
  }
  
  .howto-btn:hover {
    color: var(--text-main);
  }
  
  .howto-tooltip {
    margin: 6px 0 10px;
    font-size: 0.75rem;
    background: rgba(10, 14, 26, 0.96);
    border-radius: 10px;
    padding: 8px 10px;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    text-align: center;
  }
  
  .btn-mini {
    margin-top: 6px;
    padding: 4px 8px;
    font-size: 0.7rem;
  }
  
  /* Top bar streak / difficulty */
  
  .top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(9, 12, 24, 0.96);
    border-radius: 999px;
    padding: 6px 10px 6px 14px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    margin-bottom: 12px;
    font-size: 0.7rem;
    gap: 4px;
  }
  
  .top-item {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .top-label {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    font-size: 0.6rem;
  }
  
  .top-value {
    margin-top: 2px;
    font-weight: 600;
    font-size: 0.8rem;
  }
  
  /* Sound toggle */
  
  .sound-toggle {
    border: none;
    background: #181d30;
    border-radius: 999px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-muted);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    flex-shrink: 0;
  }
  
  .sound-toggle:hover {
    background: #202741;
    color: var(--accent-soft);
  }
  
  /* Mode switch */
  
  .mode-switch {
    display: inline-flex;
    background: rgba(13, 17, 30, 0.9);
    border-radius: 999px;
    padding: 3px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    margin: 0 auto 8px;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
  }
  
  .mode-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.78rem;
    padding: 6px 16px;
    border-radius: 999px;
    cursor: pointer;
    transition: background var(--transition-med), color var(--transition-med),
      transform var(--transition-fast);
  }
  
  .mode-btn.active {
    background: linear-gradient(135deg, #22e57f, #59ff84);
    color: #050712;
    font-weight: 600;
    transform: translateY(-0.5px);
  }
  
  /* Difficulty switch */
  
  .difficulty-switch {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: rgba(13, 17, 30, 0.9);
    border-radius: 999px;
    padding: 3px;
    border: 1px solid var(--border-subtle);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    margin: 0 auto 10px;
    max-width: 260px;
  }
  
  .difficulty-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.72rem;
    padding: 5px 12px;
    border-radius: 999px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: background var(--transition-med), color var(--transition-med),
      transform var(--transition-fast);
  }
  
  .difficulty-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-soft);
    transform: translateY(-0.5px);
  }
  
  /* Board */
  
  .board {
    background: linear-gradient(145deg, #141827, #181d30);
    border-radius: 18px;
    padding: 12px 10px;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(80, 88, 120, 0.5);
    margin-bottom: 14px;
  }
  
  .row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 6px;
  }
  
  .row:last-child {
    margin-bottom: 0;
  }
  
  /* Chain strip */
  
  .chain-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
  }
  
  .chain-strip .tile {
    position: relative;
    z-index: 1;
    margin: 0 2px;
  }
  
  /* Simple X chain link */
  .chain-link {
    position: relative;
    width: 16px;
    height: 16px;
    margin: 0 1px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
  }
  
  .chain-link::before,
  .chain-link::after {
    content: "";
    position: absolute;
    width: 14px;
    height: 2px;
    border-radius: 4px;
    background: linear-gradient(90deg, #69728c, #aab2cc, #69728c);
    box-shadow: 0 1px 2px rgba(0,0,0,0.6);
    transform-origin: center;
  }
  
  .chain-link::before { transform: rotate(40deg); }
  .chain-link::after { transform: rotate(-40deg); }
  
  /* Animations */
  
  @keyframes chainTilePulse {
    0% { transform: translateY(-1px); }
    50% { transform: translateY(-2px) scale(1.03); }
    100% { transform: translateY(-1px); }
  }
  
  @keyframes chainXLinkPulse {
    0% { background: linear-gradient(90deg, #69728c, #aab2cc, #69728c); }
    50% { background: var(--accent-soft); }
    100% { background: linear-gradient(90deg, #69728c, #aab2cc, #69728c); }
  }
  
  .chain-locked-animation .chain-link::before,
  .chain-locked-animation .chain-link::after {
    animation: chainXLinkPulse 0.7s ease-out;
  }
  
  .chain-locked-animation .tile.status-correct {
    animation: chainTilePulse 0.8s ease-out;
  }
  
  .row .tile.locked ~ .chain-link {
    opacity: 0.7;
  }
  
  /* Tiles */
  
  .tile {
    width: var(--tile-width);
    height: var(--tile-height);
    border-radius: 999px; 
    background: radial-gradient(circle at 30% 20%, #2a3044, #161827);
    border: 1px solid var(--border-subtle);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: #050712;
    text-shadow: 0 1px 2px rgba(255,255,255,0.6);
    position: relative;
    transition: transform var(--transition-fast),
      box-shadow var(--transition-fast), border var(--transition-fast),
      background var(--transition-fast);
  }
  
  .tile.active {
    transform: translateY(-1px);
    border-color: rgba(255, 255, 255, 0.4);
  }
  
  .tile.locked {
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.6);
  }
  
  .tile.status-correct {
    box-shadow: 0 0 0 2px rgba(34, 229, 127, 0.9),
      0 0 14px rgba(34, 229, 127, 0.55);
  }
  
  .tile.status-present {
    box-shadow: 0 0 0 2px rgba(249, 228, 76, 0.9),
      0 0 14px rgba(249, 228, 76, 0.55);
  }
  
  .tile.status-absent {
    opacity: 0.7;
  }
  
  /* Feedback pegs */
  
  .feedback {
    display: flex;
    gap: 5px;
    width: 80px; 
    justify-content: flex-end;
  }
  
  .feedback-dot {
    width: 11px;
    height: 11px;
    border-radius: 999px;
    background: #202435;
    border: 1px solid #343a54;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  }
  
  .feedback-dot.fb-correct {
    background: var(--accent-soft);
    border-color: #18c566;
  }
  
  .feedback-dot.fb-present {
    background: var(--accent-yellow);
    border-color: #d6c33b;
  }
  
  .feedback-dot.fb-absent {
    background: #151724;
    border-color: #383c53;
  }
  
  /* Palette */
  
  .palette-section {
    margin-top: 10px;
    background: radial-gradient(circle at top, #202741, #141827);
    padding: 10px 12px;
    border-radius: 16px;
    border: 1px solid rgba(80, 88, 120, 0.6);
    box-shadow: var(--shadow-soft);
  }
  
  .subheading {
    margin: 0 0 8px;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    text-align: center;
  }
  
  .palette {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;   
    gap: 8px;
    margin-bottom: 8px;
  }
  
  .palette-btn {
    flex: 0 0 auto;
    width: var(--tile-width);
    height: var(--tile-height);
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    position: relative;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.45);
    overflow: hidden;
    transition: transform 0.12s ease-out, box-shadow 0.12s ease-out,
      filter 0.12s ease-out, border-color 0.12s ease-out;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: #050712;
    text-shadow: 0 1px 2px rgba(255,255,255,0.6);
  }
  
  .palette-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.6);
    filter: brightness(1.06);
    border-color: rgba(255,255,255,0.5);
  }
  
  .palette-btn:active {
    transform: translateY(1px) scale(0.97);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.6);
  }
  
  .difficulty-hint {
    margin: 0 0 8px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
  }
  
  /* Buttons */
  
  .controls {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: 12px;
  }
  
  button {
    font-family: inherit;
  }
  
  .btn-primary,
  .btn-secondary,
  .btn-ghost,
  .btn-share {
    flex: 1 1 0;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background var(--transition-med),
      border var(--transition-med), transform var(--transition-fast),
      box-shadow var(--transition-fast), color var(--transition-fast),
      opacity var(--transition-fast);
  }
  
  .share-flash {
    animation: sharePulse 0.35s ease-out;
  }
  
  @keyframes sharePulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 159, 46, 0.7); transform: translateY(0); }
    60% { box-shadow: 0 0 0 10px rgba(255, 159, 46, 0); transform: translateY(-1px); }
    100% { box-shadow: 0 0 0 0 rgba(255, 159, 46, 0); transform: translateY(0); }
  }
  
  #duelBtn.duel-armed {
    background: transparent;
    color: #ffffff;
    border-color: #ffffff;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.6), 0 0 14px rgba(255, 255, 255, 0.35);
  }
  
  @keyframes duelFlash {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.9); transform: translateY(0) scale(1); }
    50% { box-shadow: 0 0 0 5px rgba(255, 255, 255, 0); transform: translateY(-1px) scale(1.03); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); transform: translateY(0) scale(1); }
  }
  
  #duelBtn.duel-flash {
    animation: duelFlash 0.4s ease-out;
  }
  
  .btn-primary {
    background: linear-gradient(135deg, #22e57f, #59ff84);
    color: #050712;
    box-shadow: 0 8px 20px rgba(34, 229, 127, 0.5);
  }
  
  .btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(34, 229, 127, 0.6);
  }
  
  .btn-primary:active {
    transform: translateY(1px) scale(0.98);
    box-shadow: 0 4px 12px rgba(34, 229, 127, 0.4);
  }
  
  .btn-secondary {
    background: #181d30;
    color: var(--text-muted);
    border-color: var(--border-subtle);
  }
  
  .btn-secondary:hover {
    background: #202741;
    color: var(--text-main);
  }
  
  .btn-ghost {
    background: transparent;
    border-color: var(--border-subtle);
    color: var(--text-muted);
  }
  
  .btn-ghost:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
  }
  
  .btn-share {
    background: linear-gradient(135deg, #ff9f2e, #ff4f70);
    color: #050712;
    box-shadow: 0 8px 20px rgba(255, 98, 134, 0.6);
  }
  
  .btn-share:disabled {
    opacity: 0.45;
    cursor: default;
    box-shadow: none;
  }
  
  /* Status & bottom bar */
  
  .status-bar {
    margin-top: 10px;
    min-height: 24px;
  }
  
  #statusText {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
  }
  
  .status-white {
    color: #ffffff !important;
  }
  
  .bottom-actions {
    display: flex;
    margin-top: 10px;
    gap: 8px;
  }
  
  /* Footer */
  
  .footer-container {
    margin-top: 40px; 
    padding-top: 20px;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
    font-size: 0.8rem; 
    color: var(--text-muted);
    width: 100%;
    max-width: 600px; 
    position: relative;
    z-index: 10;
  }
  
  .footer-content {
    padding: 0 14px;
  }
  
  .footer-links {
    display: flex;
    justify-content: center;
    gap: 12px; 
    margin-bottom: 6px;
  }
  
  .footer-link {
    margin-top: 0; 
    background: transparent;
    border: none;
    color: var(--accent); 
    font-size: 0.8rem; 
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
  }
  
  .footer-link:hover {
    color: var(--accent-soft); 
  }
  
  .footer-copy {
    font-size: 0.75rem;
    color: var(--text-muted);
  }
  
  .privacy-tooltip {
    margin-top: 6px;
    font-size: 0.7rem;
  }
  
  /* Stats & Solution modals */
  
  .modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(1, 3, 10, 0.65);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
  }
  
  .modal {
    position: relative;
    background: #0c0f1c;
    border-radius: 16px;
    padding: 14px 16px 16px;
    max-width: 360px;
    width: calc(100% - 40px);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-subtle);
    max-height: 85vh;
    display: flex;
    flex-direction: column;
  }
  
  .modal-title {
    margin: 0 0 8px;
    font-size: 0.95rem;
  }
  
  .modal-body {
    margin: 4px 0 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
  }
  
  .modal-solution {
    margin: 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
  }
  
  .modal-close {
    position: absolute;
    top: 6px;
    right: 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
  }
  
  .modal-close:hover {
    color: var(--text-main);
  }
  
  .stats-content {
    font-size: 0.8rem;
    color: var(--text-muted);
    flex: 1; 
    overflow-y: auto;
    min-height: 0;
    padding-right: 4px;
    overscroll-behavior: contain;
  }
  
  .stats-summary {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
  }
  
  .stats-summary-item {
    flex: 1 1 0;
    background: #13172a;
    border-radius: 10px;
    padding: 6px 6px;
    text-align: center;
    border: 1px solid var(--border-subtle);
  }
  
  .stats-summary-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
  }
  
  .stats-summary-value {
    margin-top: 2px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
  }
  
  .stats-section-title {
    margin: 4px 0 6px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
  }
  
  .stats-section-subtitle {
    margin: 2px 0 4px;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
  }
  
  .stats-rows {
    max-height: 210px;
  }
  
  .stats-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 3px;
  }
  
  .stats-label {
    width: 14px;
    font-size: 0.75rem;
    text-align: right;
  }
  
  .stats-bar-wrapper {
    flex: 1;
    background: #141827;
    border-radius: 999px;
    overflow: hidden;
  }
  
  .stats-bar {
    height: 18px;
    border-radius: 999px;
    background: linear-gradient(135deg, #22e57f, #59ff84);
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 6px;
    color: #050712;
    font-weight: 600;
  }
  
  .stats-intro {
    font-size: 0.8rem;
    line-height: 1.4;
    opacity: 0.9;
    margin-bottom: 8px;
  }
  
  .tier-summary {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
  }
  
  .tier-badge {
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border: 1px solid rgba(255,255,255,0.15);
  }
  
  /* Green */
  .tier-normal {
    background: rgba(34, 229, 127, 0.12);
    border-color: rgba(34, 229, 127, 0.5);
    color: var(--c-green);
  }
  
  /* Orange */
  .tier-hard {
    background: rgba(255, 159, 46, 0.12);
    border-color: rgba(255, 159, 46, 0.5);
    color: var(--c-neon-orange);
  }
  
  /* Red */
  .tier-hardest {
    background: rgba(255, 79, 112, 0.12);
    border-color: rgba(255, 79, 112, 0.6);
    color: var(--c-red);
  }
  
  .tier-next {
    flex: 1;
  }
  
  .tier-next-label {
    font-size: 0.75rem;
    opacity: 0.8;
    margin-bottom: 4px;
  }
  
  .tier-progress-bar {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: rgba(255,255,255,0.06);
    overflow: hidden;
  }
  
  .tier-progress-fill {
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #FFB347, #FF4F70);
    width: 0%;
    transition: width 0.25s ease-out;
  }
  
  .tier-achievements {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px;
    margin-bottom: 8px;
  }
  
  .tier-achievement-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
  }
  
  .tier-achievement-label {
    opacity: 0.8;
  }
  
  .tier-achievement-value {
    font-weight: 600;
  }
  
  .stats-heatmap {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
  }
  
  .heatmap-cell {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: rgba(255,255,255,0.04);
  }
  
  .heatmap-empty {
    opacity: 0.2;
  }
  
  .heatmap-win {
    background: var(--c-green); /* Green */
  }
  
  .heatmap-win-normal {
    background: var(--c-green); /* Green */
  }
  
  .heatmap-win-hard {
    background: var(--c-neon-orange); /* Orange */
  }
  
  .heatmap-win-hardest {
    background: var(--c-red); /* Red */
  }
  
  .heatmap-loss {
    background: #4b5563; /* muted grey */
  }
  
  /* --- CONTENT SECTION (AdSense Strategy) --- */
  .content-section {
    width: 100%;
    max-width: 600px;
    margin-top: 20px; /* INCREASED from 0px to 20px for extra space */
    padding: 0 14px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
    z-index: 5;
    text-align: left;
  }
  
  .content-section h2 {
    color: var(--text-main);
    font-size: 1.3rem;
    margin-bottom: 16px;
    margin-top: 10px; /* REDUCED from 32px */
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 8px;
    /* UPDATED: Centering the Heading */
    text-align: center;
  }
  
  .content-section h3 {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 10px;
    margin-top: 24px;
  }
  
  .content-section p {
    margin-bottom: 16px;
  }
  
  /* UPDATED: Removed bullets, aligned nicely */
  .content-section ul {
    margin-bottom: 16px;
    padding-left: 0;
    list-style: none;
  }
  
  .content-section li {
    margin-bottom: 8px;
  }
  
  .content-section strong {
    color: var(--text-main);
  }
  
  @media (max-width: 480px) {
    .feedback {
      display: none;
    }
  
    .row {
      justify-content: center;
    }
  }
  
  @media (max-width: 400px) {
    :root {
      --tile-width: 40px;
      --tile-height: 26px;
    }
  
    .palette-btn {
      width: var(--tile-width);
      height: var(--tile-height);
    }
  
    .feedback {
      width: 74px;
    }
  
    .tagline {
      font-size: 0.74rem;
    }
  
    .top-bar {
      font-size: 0.64rem;
      padding: 5px 8px 5px 10px;
    }
  
    .top-value {
      font-size: 0.76rem;
    }
  
    .difficulty-switch {
      max-width: 100%;
    }
  
    .sound-toggle {
      width: 26px;
      height: 26px;
      font-size: 0.9rem;
    }
  
    .stats-explainer {
      font-size: 0.8rem;
      line-height: 1.4;
      opacity: 0.8;
      margin: 8px 0 4px;
    }
    
    .stats-summary-small .stats-summary-item {
      flex: 1 1 auto;
    }
  }
  
  /* --- COOL BACK NAV --- */
  .arcade-return-nav {
    width: 100%;
    max-width: 460px;
    margin: 20px auto 10px;
    display: flex;
    justify-content: center;
    z-index: 5;
    position: relative;
  }
  
  .return-link {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    background: rgba(13, 17, 30, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 12px 28px;
    border-radius: 999px;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  }
  
  .return-link:hover {
    background: rgba(34, 229, 127, 0.12); /* Green tint */
    border-color: #22e57f; /* Green Border */
    color: #ffffff;
    box-shadow: 0 0 25px rgba(34, 229, 127, 0.25); /* Green Glow */
    transform: translateY(-2px);
  }
  
  .return-icon {
    font-size: 1.1em;
    transition: transform 0.3s ease;
  }
  
  .return-link:hover .return-icon {
    transform: translateX(-4px);
  }
  
  .return-link:active {
    transform: translateY(0) scale(0.98);
    opacity: 0.8;
  }