:root {
      --ink: #182335;
      --muted: #5c6678;
      --panel: #ffffff;
      --page: #f3f5f8;
      --blue: #3f8fde;
      --blue-dark: #2674c4;
      --purple: #5145e5;
      --purple-dark: #4034cd;
      --green: #27a86b;
      --shadow: 0 14px 35px rgba(25, 38, 62, 0.14);
      --radius: 22px;
    }

    * { box-sizing: border-box; }

    html, body { min-height: 100%; }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      color: var(--ink);
      background: var(--page);
    }

    button, select { font: inherit; }

    button { cursor: pointer; }

    .screen { display: none; min-height: 100vh; }
    .screen.active { display: flex; flex-direction: column; }

    .site-header {
      padding: 28px 24px 22px;
      text-align: center;
      background: linear-gradient(180deg, #f8fafc 0%, #eef1f5 100%);
      border-bottom: 1px solid #e4e8ee;
    }

    .site-title {
      margin: 0;
      font-size: clamp(2rem, 5vw, 4rem);
      line-height: 1;
      letter-spacing: -0.04em;
    }

    .menu-wrap {
      width: min(1000px, calc(100% - 32px));
      margin: auto;
      padding: 36px 0;
    }

    .menu-card {
      background: var(--panel);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: clamp(28px, 5vw, 62px);
      text-align: center;
    }

    .menu-card h2 {
      margin: 0 0 34px;
      font-size: clamp(1.75rem, 4vw, 3rem);
    }

    .field-label {
      display: block;
      margin-bottom: 16px;
      color: var(--muted);
      font-size: clamp(1.15rem, 2.4vw, 1.8rem);
    }

    select {
      width: 100%;
      min-height: 70px;
      padding: 0 24px;
      border: 3px solid #7471ef;
      border-radius: 16px;
      background: white;
      font-size: clamp(1.05rem, 2.3vw, 1.6rem);
      outline: none;
    }

    select:focus { box-shadow: 0 0 0 4px rgba(81, 69, 229, .16); }

    .primary-button,
    .secondary-button {
      border: 0;
      border-radius: 15px;
      min-height: 66px;
      padding: 0 28px;
      font-weight: 700;
      font-size: clamp(1.05rem, 2.3vw, 1.45rem);
      box-shadow: 0 7px 15px rgba(30, 40, 70, .15);
      transition: transform .15s ease, background .15s ease;
    }

    .primary-button {
      width: 100%;
      margin-top: 22px;
      background: var(--purple);
      color: white;
    }

    .primary-button:hover { background: var(--purple-dark); transform: translateY(-1px); }
    .secondary-button { background: #737b8b; color: white; }
    .secondary-button:hover { background: #626978; transform: translateY(-1px); }

    .game-area {
      width: min(1500px, calc(100% - 24px));
      margin: 0 auto;
      padding: 24px 0 30px;
      display: grid;
      grid-template-columns: minmax(0, 1fr) 300px;
      gap: 24px;
      align-items: start;
      flex: 1;
    }

    .game-main { min-width: 0; }

    .status-row {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 18px;
    }

    .status-pill {
      background: white;
      border-radius: 999px;
      padding: 10px 18px;
      box-shadow: 0 5px 14px rgba(25, 38, 62, .10);
      font-size: 1rem;
      font-weight: 700;
    }

    .board {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: clamp(8px, 1.35vw, 18px);
      width: 100%;
      max-width: 980px;
      margin: 0 auto;
    }

    .card {
      position: relative;
      aspect-ratio: 1 / 0.92;
      border: 0;
      background: transparent;
      padding: 0;
      perspective: 1000px;
      min-width: 0;
    }

    .card-inner {
      position: absolute;
      inset: 0;
      transform-style: preserve-3d;
      transition: transform .42s ease;
    }

    .card.flipped .card-inner,
    .card.matched .card-inner { transform: rotateY(180deg); }

    .card-face {
      position: absolute;
      inset: 0;
      border-radius: 18px;
      backface-visibility: hidden;
      box-shadow: 0 8px 18px rgba(23, 48, 83, .16);
      overflow: hidden;
    }

    .card-back {
      display: grid;
      place-items: center;
      background: linear-gradient(145deg, #4c9ae4, #3584d3);
      color: white;
      font-weight: 800;
      font-size: clamp(2.2rem, 6vw, 4.5rem);
      border: 4px solid rgba(255,255,255,.2);
    }

    .card-back::after { content: "?"; }

    .card-front {
      transform: rotateY(180deg);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 7px;
      background: white;
      border: 4px solid #dfe8f1;
      padding: 8px;
    }

    .card.matched .card-front {
      border-color: #5ac18d;
      background: #f1fff8;
    }

    .card-front img {
      width: 100%;
      height: calc(100% - 26px);
      object-fit: contain;
      min-height: 0;
    }

    .card-name {
      width: 100%;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      color: var(--ink);
      font-weight: 700;
      font-size: clamp(.65rem, 1.35vw, 1rem);
      line-height: 1;
    }

    .card:focus-visible { outline: 5px solid #ffbf47; outline-offset: 3px; border-radius: 18px; }
    .card.matched { cursor: default; }

    .side-panel {
      position: sticky;
      top: 18px;
      background: white;
      border-radius: 20px;
      box-shadow: var(--shadow);
      padding: 22px;
    }

    .side-panel h2 {
      margin: 0 0 6px;
      font-size: 1.45rem;
    }

    .side-panel p {
      margin: 0 0 14px;
      color: var(--muted);
      line-height: 1.35;
    }

    .matched-list {
      min-height: 220px;
      margin: 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 8px;
      align-content: start;
    }

    .matched-list li {
      display: flex;
      align-items: center;
      gap: 9px;
      padding: 10px 12px;
      border-radius: 12px;
      background: #edf9f3;
      color: #176843;
      font-weight: 700;
      animation: pop .25s ease;
    }

    .matched-list li::before {
      content: "✓";
      display: grid;
      place-items: center;
      width: 24px;
      height: 24px;
      flex: 0 0 24px;
      border-radius: 50%;
      background: var(--green);
      color: white;
    }

    .empty-message {
      color: #8a93a1;
      font-style: italic;
      padding: 10px 0;
    }

    .game-buttons {
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      margin-top: 18px;
    }

    .game-buttons .primary-button,
    .game-buttons .secondary-button { margin: 0; width: 100%; min-height: 54px; font-size: 1.05rem; }

    .sound-button {
      border: 0;
      border-radius: 999px;
      padding: 10px 16px;
      background: white;
      color: var(--ink);
      box-shadow: 0 5px 14px rgba(25, 38, 62, .10);
      font-weight: 700;
    }

    .sound-button:hover { background: #f7f9fc; }

    .confetti-piece {
      position: fixed;
      top: -20px;
      z-index: 60;
      width: 12px;
      height: 18px;
      border-radius: 3px;
      pointer-events: none;
      animation: confetti-fall 2.8s linear forwards;
    }

    @keyframes confetti-fall {
      to { transform: translate3d(var(--drift), 110vh, 720deg); opacity: .9; }
    }

    .win-overlay {
      position: fixed;
      inset: 0;
      z-index: 50;
      display: none;
      place-items: center;
      padding: 20px;
      background: rgba(15, 25, 42, .62);
    }

    .win-overlay.show { display: grid; }

    .win-card {
      width: min(520px, 100%);
      background: white;
      text-align: center;
      padding: 38px;
      border-radius: 24px;
      box-shadow: 0 25px 70px rgba(0,0,0,.30);
    }

    .win-icon { font-size: 4rem; }
    .win-card h2 { margin: 8px 0; font-size: 2.2rem; }
    .win-card p { color: var(--muted); font-size: 1.1rem; }
    .win-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
    .win-actions button { min-height: 58px; }

    @keyframes pop { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }

    @media (max-width: 980px) {
      .game-area { grid-template-columns: 1fr; }
      .side-panel { position: static; width: min(980px, 100%); margin: 0 auto; }
      .matched-list { min-height: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .game-buttons { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 620px) {
      .site-header { padding: 20px 12px 16px; }
      .game-area { width: min(100% - 12px, 1500px); padding-top: 12px; gap: 14px; }
      .board { gap: 6px; }
      .card { aspect-ratio: 1 / 1.06; }
      .card-face { border-radius: 12px; }
      .card-front { padding: 4px; border-width: 3px; }
      .card-front img { height: calc(100% - 18px); }
      .card-name { font-size: .55rem; }
      .status-row { margin-bottom: 10px; gap: 6px; }
      .status-pill { padding: 7px 11px; font-size: .82rem; }
      .matched-list { grid-template-columns: 1fr; }
      .game-buttons, .win-actions { grid-template-columns: 1fr; }
    }

    @media (max-height: 850px) and (min-width: 981px) {
      .site-header { padding: 16px 24px 13px; }
      .site-title { font-size: clamp(2rem, 4vh, 3rem); }
      .game-area { padding-top: 12px; }
      .board { max-width: min(76vh, 900px); }
      .card { aspect-ratio: 1 / 0.88; }
      .status-row { margin-bottom: 10px; }
    }