:root {
      --bg: #1a1a2e;
      --light: #F0D9B5;
      --dark: #B58863;
      --panel: #20243d;
      --text: #f2f4ff;
      --accent: #5ad1ff;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      min-height: 100vh;
      background: var(--bg);
      color: var(--text);
      font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 16px;
    }
    .app {
      display: flex;
      gap: 20px;
      width: min(1200px, 100%);
      align-items: flex-start;
      justify-content: center;
    }
    .board-area { display: flex; flex-direction: column; align-items: center; gap: 12px; }
    .board-frame {
      position: relative;
      width: min(90vw, 80vh);
      height: min(90vw, 80vh);
      max-width: 760px;
      max-height: 760px;
      display: grid;
      grid-template-columns: 24px 1fr 24px;
      grid-template-rows: 24px 1fr 24px;
      user-select: none;
    }
    .labels-files, .labels-ranks {
      display: grid;
      color: #cfd3ff;
      font-size: clamp(11px, 1.4vmin, 14px);
      opacity: .85;
      font-weight: 600;
      letter-spacing: .3px;
    }
    .labels-files { grid-template-columns: repeat(8, 1fr); align-items: center; text-align: center; }
    .labels-ranks { grid-template-rows: repeat(8, 1fr); align-items: center; text-align: center; }
    .top-files { grid-column: 2; grid-row: 1; }
    .bottom-files { grid-column: 2; grid-row: 3; }
    .left-ranks { grid-column: 1; grid-row: 2; }
    .right-ranks { grid-column: 3; grid-row: 2; }
    .board {
      grid-column: 2;
      grid-row: 2;
      position: relative;
      display: grid;
      grid-template-columns: repeat(8, 1fr);
      grid-template-rows: repeat(8, 1fr);
      border: 2px solid #2d3152;
      box-shadow: 0 14px 35px rgba(0,0,0,.45);
      overflow: hidden;
      border-radius: 6px;
    }
    .square {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      overflow: hidden;
    }
    .light { background: var(--light); }
    .dark { background: var(--dark); }
    .square.selected { box-shadow: inset 0 0 0 999px rgba(255, 255, 0, 0.5); }
    .square.last-move { box-shadow: inset 0 0 0 999px rgba(90, 170, 255, 0.25); }
    .square.check { box-shadow: inset 0 0 0 999px rgba(255, 0, 0, 0.45); }
    .square.check.flash { animation: kingFlash .5s ease-in-out 2; }
    @keyframes kingFlash {
      0%,100% { box-shadow: inset 0 0 0 999px rgba(255, 0, 0, 0.2); }
      50% { box-shadow: inset 0 0 0 999px rgba(255, 0, 0, 0.75); }
    }
    .piece {
      font-size: clamp(24px, 5.9vmin, 54px);
      line-height: 1;
      z-index: 2;
      pointer-events: none;
      transition: transform 250ms ease;
    }
    .piece.white { color: #fff; text-shadow: 0 0 2px #000, 1px 1px 2px #000; }
    .piece.black { color: #000; text-shadow: 0 0 2px #fff, 1px 1px 2px #fff; }
    .move-dot {
      width: 26%;
      height: 26%;
      border-radius: 50%;
      background: rgba(30, 180, 90, 0.8);
      z-index: 1;
      pointer-events: none;
    }
    .capture-ring {
      width: 70%;
      height: 70%;
      border-radius: 50%;
      background: rgba(220, 40, 40, 0.38);
      border: 2px solid rgba(255, 90, 90, .75);
      z-index: 1;
      pointer-events: none;
    }
    .side {
      width: 250px;
      background: var(--panel);
      border: 1px solid #2f3359;
      border-radius: 10px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      box-shadow: 0 10px 25px rgba(0,0,0,.25);
      max-height: min(90vw, 80vh);
    }
    .card { background: #171a31; border: 1px solid #2a2f57; border-radius: 8px; padding: 9px; }
    .card h4 { margin: 0 0 6px; font-size: 13px; color: #c8cdff; text-transform: uppercase; letter-spacing: .4px; }
    .status-text { font-size: 14px; line-height: 1.35; }
    .difficulty { font-size: 14px; }
    .captured { font-size: 24px; min-height: 32px; letter-spacing: 1px; }
    .history {
      display: grid;
      grid-template-columns: 30px 1fr 1fr;
      gap: 4px;
      align-items: start;
      height: 220px;
      overflow-y: auto;
      font-family: ui-monospace, Menlo, Consolas, monospace;
      font-size: 13px;
      padding-right: 4px;
    }
    .history .hdr { font-weight: 700; position: sticky; top: 0; background: #171a31; z-index: 1; }
    button {
      border: none;
      border-radius: 8px;
      padding: 10px;
      font-weight: 700;
      cursor: pointer;
      color: #fff;
      background: #3b62e7;
    }
    button.secondary { background: #4a4f74; }
    button.danger { background: #9b2c2c; border: 1px solid #bf3a3a; }
    button:disabled { opacity: .55; cursor: not-allowed; }
    .turn-indicator {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 15px;
      background: #20243d;
      border: 1px solid #303760;
      padding: 8px 12px;
      border-radius: 20px;
    }
    .dot {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      border: 1px solid #666;
      background: #fff;
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(10, 12, 25, 0.76);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 50;
      padding: 16px;
      animation: fadeIn 220ms ease;
    }
    .overlay.show { display: flex; }
    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
    .modal {
      width: min(95vw, 520px);
      background: #20243d;
      border: 1px solid #393e66;
      border-radius: 12px;
      box-shadow: 0 14px 35px rgba(0,0,0,.45);
      padding: 18px;
    }
    .modal h2 { margin-top: 0; margin-bottom: 10px; }
    .difficulty-list { display: grid; gap: 10px; }
    .difficulty-item {
      border: 1px solid #3a3f68;
      border-radius: 10px;
      padding: 10px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #171a31;
    }
    .difficulty-item:hover { border-color: #5ad1ff; }
    .promo-choices { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
    .promo-btn { font-size: 34px; padding: 8px; background: #171a31; border: 1px solid #3c4270; }
    .floating-piece {
      position: fixed;
      z-index: 40;
      pointer-events: none;
      transform: translate(0, 0);
      transition: transform 250ms ease;
    }
    .captured-fx {
      position: fixed;
      z-index: 39;
      pointer-events: none;
      transition: transform 200ms ease, opacity 200ms ease;
    }

    .brand-logo {
      position: fixed;
      top: 14px;
      left: 16px;
      z-index: 70;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 12px;
      border-radius: 12px;
      background: linear-gradient(135deg, #2b2f52, #1b1f3a);
      border: 1px solid #4f578f;
      box-shadow: 0 10px 24px rgba(0,0,0,.35);
      font-weight: 800;
      letter-spacing: .3px;
    }
    .brand-logo .icon {
      width: 28px;
      height: 28px;
      border-radius: 7px;
      background: linear-gradient(180deg, #f0d9b5, #b58863);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #111;
      font-size: 18px;
      line-height: 1;
    }
    .brand-logo .text { color: #f5f7ff; }
    .brand-logo .sub { color: #8fd7ff; font-size: 12px; margin-left: 6px; }

    .brand-login-status {
      position: fixed;
      top: 64px;
      left: 16px;
      z-index: 69;
      color: #d6dcff;
      background: rgba(18, 22, 45, .92);
      border: 1px solid #3c4478;
      border-radius: 10px;
      padding: 6px 10px;
      font-size: 12px;
      max-width: min(72vw, 280px);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .brand-menu {
      position: fixed;
      top: 92px;
      left: 16px;
      z-index: 69;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .brand-menu button {
      padding: 8px 10px;
      font-size: 13px;
      border: 1px solid #3b4473;
      background: #232949;
    }


    .top-actions {
      position: fixed;
      top: 14px;
      right: 16px;
      z-index: 69;
      display: flex;
      gap: 8px;
    }

    .class-summary-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 8px;
      align-items: start;
    }
    .class-col {
      display: grid;
      gap: 8px;
    }
    .class-row {
      min-height: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .class-icon-col {
      display: grid;
      gap: 8px;
      justify-items: center;
    }
    .class-icon-wrap {
      min-height: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .version-footer {
      position: fixed;
      left: 50%;
      bottom: 10px;
      transform: translateX(-50%);
      z-index: 60;
      color: #b8bfe8;
      background: rgba(14, 17, 31, .65);
      border: 1px solid #343a63;
      border-radius: 999px;
      padding: 6px 12px;
      font-size: 12px;
      letter-spacing: .3px;
    }

     .analyzer-layout { display:flex; gap:12px; min-height:0; flex:1; }
    .analyzer-side { width:300px; display:flex; flex-direction:column; gap:10px; }
    .game-list { max-height:260px; overflow:auto; display:grid; gap:6px; }
    .game-list button { text-align:left; font-weight:600; }

    .game-list-row {
      display: grid;
      grid-template-columns: 1fr auto auto;
      gap: 6px;
      align-items: stretch;
    }
    .game-open-btn {
      width: 100%;
    }
    .game-share-btn {
      padding: 8px 10px;
      min-width: 68px;
      font-size: 12px;
      background: #3b4b8f;
      border: 1px solid #5b6fc6;
    }


    @media (max-width: 1100px) {
      body { align-items: flex-start; padding: 10px; }
      .app { flex-direction: column; align-items: center; gap: 12px; width: 100%; }
      .board-frame { width: min(96vw, 78vh); height: min(96vw, 78vh); }
      .side { width: min(96vw, 760px); max-height: unset; }
      .history { height: 180px; }
      .analyzer-layout { flex-direction: column; }
      .analyzer-side { width: 100%; }
      .game-list { max-height: 220px; }
      #reviewMain > div { flex-direction: column !important; }
      #reviewMain > div > div:first-child { width: 100% !important; }
      #reviewMain > div > div:last-child { width: 100% !important; }
      #reviewMain .board-frame { width: min(96vw, 520px) !important; height: min(96vw, 520px) !important; }
      #reviewScreen .modal { width: min(99vw, 1380px) !important; height: auto !important; max-height: 96vh; overflow: auto; }
    }

    @media (max-width: 760px) {
      .brand-logo,
      .brand-login-status,
      .brand-menu,
      .top-actions {
        position: static;
      }
      body {
        display: block;
        padding: 8px;
      }
      .brand-logo,
      .brand-login-status,
      .brand-menu,
      .top-actions {
        margin: 0 0 8px;
      }
      .brand-menu { display: inline-flex; }
      .top-actions { display: inline-flex; float: right; }
      .version-footer { position: static; transform: none; display: inline-block; margin: 10px 0 0; }
      .captured { font-size: 20px; }
      .history { font-size: 12px; }
      .class-summary-grid { grid-template-columns: 1fr auto 1fr; gap: 6px; }
      .class-row { min-height: 28px; }
    }


    .review-arrow-overlay {
      grid-column: 2;
      grid-row: 2;
      position: absolute;
      inset: 24px;
      width: calc(100% - 48px);
      height: calc(100% - 48px);
      pointer-events: none;
      z-index: 5;
      overflow: visible;
    }