:root {
    --bg: #07040f;
    --accent: #bf00ff;
    --accent2: #00f5ff;
    --gold: #ffd60a;
    --match: #00ffaa;
    --red: #ff2255;
    --glow-p: 0 0 10px #bf00ff, 0 0 25px #bf00ff;
    --glow-c: 0 0 10px #00f5ff, 0 0 25px #00f5ff;
    --glow-g: 0 0 10px #ffd60a, 0 0 25px #ffd60a;
    --glow-m: 0 0 10px #00ffaa, 0 0 25px #00ffaa;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    font-family: 'Press Start 2P', monospace;
    overflow-x: hidden;
    padding: 16px 8px 30px;
  }

  /* Animated background grid */
  body::before {
    content: '';
    position: fixed; inset: 0;
    background-image:
      linear-gradient(rgba(191,0,255,0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,245,255,0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: gridDrift 25s linear infinite;
    pointer-events: none; z-index: 0;
  }
  @keyframes gridDrift { 0%{background-position:0 0} 100%{background-position:40px 40px} }

  /* CRT scanlines */
  body::after {
    content: '';
    position: fixed; inset: 0;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.1) 2px, rgba(0,0,0,0.1) 4px);
    pointer-events: none; z-index: 200;
  }

  /* ── LAYOUT ── */
  .page { position: relative; z-index: 1; width: 100%; max-width: 600px; display: flex; flex-direction: column; align-items: center; gap: 14px; }

  /* ── TITLE ── */
  .title-main {
    font-family: 'Orbitron', sans-serif; font-weight: 900;
    font-size: clamp(20px, 6vw, 36px);
    color: var(--accent);
    text-shadow: var(--glow-p), 0 0 60px #bf00ff;
    letter-spacing: 0.15em; text-align: center;
    animation: titlePulse 3s ease-in-out infinite;
  }
  @keyframes titlePulse {
    0%,100% { text-shadow: var(--glow-p); }
    50% { text-shadow: 0 0 20px #bf00ff, 0 0 50px #bf00ff, 0 0 90px #bf00ff; }
  }
  .title-sub {
    font-size: 8px; color: var(--gold);
    text-shadow: var(--glow-g);
    letter-spacing: 0.45em; display: block;
    text-align: center; margin-top: 4px;
  }

  /* ── HUD ── */
  .hud {
    display: flex; gap: 10px; flex-wrap: wrap; justify-content: center;
  }
  .hud-box {
    border: 2px solid var(--accent);
    padding: 8px 14px; text-align: center;
    clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
    box-shadow: var(--glow-p), inset 0 0 10px rgba(191,0,255,0.1);
    min-width: 80px;
  }
  .hud-box.cyan { border-color: var(--accent2); box-shadow: var(--glow-c), inset 0 0 10px rgba(0,245,255,0.1); }
  .hud-box.gold  { border-color: var(--gold);  box-shadow: var(--glow-g), inset 0 0 10px rgba(255,214,10,0.1); }
  .hud-box.green { border-color: var(--match);  box-shadow: var(--glow-m), inset 0 0 10px rgba(0,255,170,0.1); }
  .hud-label { font-size: 7px; color: var(--accent); letter-spacing: 0.15em; margin-bottom: 4px; }
  .hud-box.cyan  .hud-label { color: var(--accent2); }
  .hud-box.gold  .hud-label { color: var(--gold); }
  .hud-box.green .hud-label { color: var(--match); }
  .hud-val {
    font-family: 'Orbitron', sans-serif; font-weight: 900;
    font-size: 22px; color: var(--accent);
    text-shadow: var(--glow-p);
  }
  .hud-box.cyan  .hud-val { color: var(--accent2); text-shadow: var(--glow-c); }
  .hud-box.gold  .hud-val { color: var(--gold);  text-shadow: var(--glow-g); }
  .hud-box.green .hud-val { color: var(--match); text-shadow: var(--glow-m); }
  .hud-val.danger { color: var(--red) !important; text-shadow: 0 0 10px var(--red), 0 0 25px var(--red) !important; animation: blink 0.5s step-end infinite; }
  @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

  /* ── DIFFICULTY SELECTOR ── */
  .diff-row { display: flex; gap: 8px; }
  .diff-btn {
    font-family: 'Press Start 2P', monospace; font-size: 7px;
    padding: 9px 14px; background: transparent;
    color: rgba(191,0,255,0.6); border: 2px solid rgba(191,0,255,0.3);
    cursor: pointer;
    clip-path: polygon(5px 0%, 100% 0%, calc(100% - 5px) 100%, 0% 100%);
    transition: all 0.2s; letter-spacing: 0.1em;
  }
  .diff-btn:hover { color: var(--accent); border-color: var(--accent); box-shadow: var(--glow-p); }
  .diff-btn.active {
    color: var(--bg); background: var(--accent);
    border-color: var(--accent); box-shadow: var(--glow-p);
  }

  /* ── CARD GRID ── */
  .grid-wrap {
    padding: 4px;
    background: linear-gradient(135deg, rgba(191,0,255,0.4), rgba(0,245,255,0.3));
    border-radius: 6px;
  }
  .grid {
    display: grid;
    gap: 6px;
    padding: 6px;
    background: rgba(7,4,15,0.95);
    border-radius: 4px;
  }

  /* ── CARD ── */
  .card {
    perspective: 700px;
    cursor: pointer;
  }
  .card-inner {
    width: 100%; height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 6px;
  }
  .card.flipped .card-inner,
  .card.matched .card-inner {
    transform: rotateY(180deg);
  }

  .card-face {
    position: absolute; inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px;
    border: 2px solid;
  }

  /* BACK face (shown by default) */
  .card-back {
    background: rgba(191,0,255,0.06);
    border-color: rgba(191,0,255,0.35);
    box-shadow: inset 0 0 16px rgba(0,0,0,0.6);
    flex-direction: column; gap: 4px;
  }
  .card-back-pattern {
    width: 60%; height: 60%;
    border: 2px solid rgba(191,0,255,0.25);
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    color: rgba(191,0,255,0.3);
    font-size: 18px;
  }

  /* FRONT face (shown when flipped) */
  .card-front {
    transform: rotateY(180deg);
    background: rgba(7,4,20,0.97);
    border-color: rgba(191,0,255,0.6);
    box-shadow: 0 0 12px rgba(191,0,255,0.3);
    font-size: clamp(24px,6vw,42px);
    transition: border-color 0.3s, box-shadow 0.3s;
  }

  /* MATCHED state */
  .card.matched .card-front {
    border-color: var(--match);
    box-shadow: 0 0 16px var(--match), 0 0 35px var(--match), inset 0 0 14px rgba(0,255,170,0.1);
    animation: matchGlow 0.5s cubic-bezier(0.34,1.56,0.64,1);
  }
  @keyframes matchGlow {
    0% { transform: rotateY(180deg) scale(0.85); }
    60% { transform: rotateY(180deg) scale(1.12); }
    100% { transform: rotateY(180deg) scale(1); }
  }

  /* WRONG shake */
  .card.wrong .card-inner {
    animation: wrongShake 0.45s ease;
  }
  @keyframes wrongShake {
    0%,100% { transform: rotateY(180deg) translateX(0); }
    20% { transform: rotateY(180deg) translateX(-6px); }
    40% { transform: rotateY(180deg) translateX(6px); }
    60% { transform: rotateY(180deg) translateX(-4px); }
    80% { transform: rotateY(180deg) translateX(4px); }
  }

  .card:hover:not(.flipped):not(.matched) .card-face.card-back {
    border-color: rgba(191,0,255,0.7);
    box-shadow: 0 0 12px rgba(191,0,255,0.4), inset 0 0 16px rgba(0,0,0,0.6);
  }
  .card:hover:not(.flipped):not(.matched) .card-back-pattern {
    border-color: rgba(191,0,255,0.5);
    color: rgba(191,0,255,0.6);
  }

  /* ── STATUS MESSAGE ── */
  .status-msg {
    font-size: 9px; height: 18px; text-align: center;
    color: var(--gold); text-shadow: var(--glow-g);
    letter-spacing: 0.15em;
  }

  /* ── BUTTONS ── */
  .btns { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
  .btn {
    font-family: 'Press Start 2P', monospace; font-size: 8px;
    padding: 12px 18px; border: none; cursor: pointer;
    letter-spacing: 0.1em;
    clip-path: polygon(6px 0%, 100% 0%, calc(100% - 6px) 100%, 0% 100%);
    transition: all 0.15s;
  }
  .btn-new { background: var(--accent); color: var(--bg); box-shadow: var(--glow-p); }
  .btn-new:hover { box-shadow: 0 0 20px #bf00ff, 0 0 50px #bf00ff; transform: translateY(-2px); }
  .btn-pause {
    background: transparent; color: var(--accent2);
    border: 2px solid var(--accent2); box-shadow: var(--glow-c);
  }
  .btn-pause:hover { background: rgba(0,245,255,0.1); transform: translateY(-2px); }

  /* ── WIN / GAME OVER OVERLAY ── */
  .overlay {
    position: fixed; inset: 0; z-index: 300;
    background: rgba(7,4,15,0.9);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 18px; backdrop-filter: blur(6px);
    opacity: 0; pointer-events: none;
    transition: opacity 0.4s;
  }
  .overlay.show { opacity: 1; pointer-events: all; }

  .ov-emoji { font-size: 64px; animation: ovPop 0.5s cubic-bezier(0.34,1.56,0.64,1); }
  @keyframes ovPop { from{transform:scale(0.2) rotate(-20deg);opacity:0} to{transform:scale(1) rotate(0deg);opacity:1} }

  .ov-title {
    font-family: 'Orbitron', sans-serif; font-weight: 900;
    font-size: clamp(22px,6vw,42px);
    letter-spacing: 0.12em; text-align: center;
    animation: ovPop 0.5s 0.1s cubic-bezier(0.34,1.56,0.64,1) both;
  }
  .ov-title.win  { color: var(--gold);  text-shadow: var(--glow-g), 0 0 80px var(--gold); }
  .ov-title.lose { color: var(--red);   text-shadow: 0 0 10px var(--red), 0 0 30px var(--red); }

  .ov-stats {
    display: flex; gap: 12px; flex-wrap: wrap; justify-content: center;
    animation: ovPop 0.5s 0.2s cubic-bezier(0.34,1.56,0.64,1) both;
  }
  .ov-stat {
    text-align: center; padding: 10px 16px;
    border: 2px solid rgba(255,255,255,0.15);
    clip-path: polygon(6px 0%,100% 0%,calc(100% - 6px) 100%,0% 100%);
  }
  .ov-stat-label { font-size: 7px; color: rgba(255,255,255,0.5); letter-spacing: 0.2em; margin-bottom: 4px; }
  .ov-stat-val { font-family:'Orbitron',sans-serif; font-weight:900; font-size:20px; color:#fff; }

  .ov-rating {
    font-size: 9px; letter-spacing: 0.15em; text-align: center;
    color: var(--match); text-shadow: var(--glow-m);
    animation: ovPop 0.5s 0.25s cubic-bezier(0.34,1.56,0.64,1) both;
  }

  .ov-btn {
    font-family: 'Press Start 2P', monospace; font-size: 10px;
    padding: 16px 30px; background: var(--gold);
    color: var(--bg); border: none; cursor: pointer;
    clip-path: polygon(8px 0%,100% 0%,calc(100% - 8px) 100%,0% 100%);
    box-shadow: var(--glow-g);
    animation: floatBtn 2s ease-in-out infinite, ovPop 0.5s 0.3s cubic-bezier(0.34,1.56,0.64,1) both;
    letter-spacing: 0.1em;
  }
  .ov-btn:hover { box-shadow: 0 0 25px var(--gold), 0 0 60px var(--gold); transform: scale(1.05); }
  @keyframes floatBtn { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }

  /* ── PAUSE OVERLAY ── */
  .pause-overlay {
    position: fixed; inset: 0; z-index: 250;
    background: rgba(7,4,15,0.88);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 16px; backdrop-filter: blur(4px);
    opacity: 0; pointer-events: none; transition: opacity 0.3s;
  }
  .pause-overlay.show { opacity: 1; pointer-events: all; }
  .pause-title {
    font-family:'Orbitron',sans-serif; font-weight:900;
    font-size: clamp(28px,7vw,50px);
    color: var(--accent2); text-shadow: var(--glow-c);
    letter-spacing: 0.15em;
  }

  /* ── COMBO POPUP ── */
  .combo-pop {
    position: fixed; top: 20%; left: 50%; transform: translateX(-50%);
    font-family: 'Orbitron', sans-serif; font-weight: 900;
    font-size: clamp(20px,5vw,32px);
    color: var(--gold); text-shadow: var(--glow-g);
    z-index: 150; pointer-events: none;
    animation: comboPop 0.8s cubic-bezier(0.34,1.56,0.64,1) forwards;
  }
  @keyframes comboPop {
    0%   { opacity:0; transform:translateX(-50%) translateY(20px) scale(0.5); }
    30%  { opacity:1; transform:translateX(-50%) translateY(0) scale(1.1); }
    70%  { opacity:1; transform:translateX(-50%) translateY(-10px) scale(1); }
    100% { opacity:0; transform:translateX(-50%) translateY(-40px) scale(0.8); }
  }

  /* ── CORNER DECORATIONS ── */
  .corner { position:fixed; width:50px; height:50px; opacity:0.35; }
  .corner-tl { top:16px; left:16px; border-top:2px solid var(--accent); border-left:2px solid var(--accent); }
  .corner-tr { top:16px; right:16px; border-top:2px solid var(--accent2); border-right:2px solid var(--accent2); }
  .corner-bl { bottom:16px; left:16px; border-bottom:2px solid var(--accent2); border-left:2px solid var(--accent2); }
  .corner-br { bottom:16px; right:16px; border-bottom:2px solid var(--accent); border-right:2px solid var(--accent); }