:root {
    --bg: #0f172a;
    --panel: #1e293b;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --accent: #2dd4bf;
    /* The board is taller than wide (aspect ≈ 0.874, set by JS from the hole
       grid); the vh term keeps it (plus header, seat chips and controls)
       inside short/wide windows, and on phones the vmin term still wins. */
    --board: min(94vmin, 540px, calc((100vh - 216px) * 0.874));
    --hole: calc(var(--board) * 0.0694); /* one hole's diameter */
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    overscroll-behavior: none;
  }
  body {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    height: 100vh;
    height: 100dvh;
    padding: max(10px, env(safe-area-inset-top))
             max(10px, env(safe-area-inset-right))
             max(10px, env(safe-area-inset-bottom))
             max(10px, env(safe-area-inset-left));
  }
  header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: var(--board);
    gap: 10px;
  }
  header a { color: var(--muted); text-decoration: none; font-size: 14px; white-space: nowrap; }
  #status { font-size: 15px; font-weight: 600; text-align: right; min-height: 1.2em; }
  /* One chip per player: colour, name, marbles home. The side to move glows. */
  #seats {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    width: var(--board);
    min-height: 29px;
  }
  .chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 10px;
    background: var(--panel);
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
  }
  .chip .home { color: var(--muted); font-weight: 600; font-variant-numeric: tabular-nums; }
  .chip.turn { border-color: var(--accent); }
  /* Team games: each opposite-corner pair shares a dashed ring */
  .team {
    display: flex;
    gap: 4px;
    padding: 3px;
    border: 1px dashed rgba(255, 255, 255, 0.25);
    border-radius: 999px;
  }
  #wrap { position: relative; }
  #board {
    position: relative;
    width: var(--board);
    /* aspect-ratio comes inline from JS — the exact hole-grid proportions */
    touch-action: none; /* board drags must reach pointermove, not the browser */
  }
  /* The star-shaped board face, clipped by JS to the true hexagram outline.
     It's oversized (inset -8%) so the six tips reach past the hole grid. */
  #star {
    position: absolute;
    inset: -8%;
    background: radial-gradient(circle at 50% 42%, #263452, #1a2440 72%);
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.5));
    z-index: 0;
  }
  .hole {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(2, 6, 18, 0.5);
    box-shadow: inset 0 2px 3px rgba(0, 0, 0, 0.55), inset 0 -1px 0 rgba(255, 255, 255, 0.06);
    z-index: 1;
  }
  /* Faint colour rings mark the six corner triangles — home and target */
  .hole.h0 { box-shadow: inset 0 0 0 2px rgba(248, 113, 113, 0.4), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.h1 { box-shadow: inset 0 0 0 2px rgba(251, 146, 60, 0.4), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.h2 { box-shadow: inset 0 0 0 2px rgba(250, 204, 21, 0.4), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.h3 { box-shadow: inset 0 0 0 2px rgba(74, 222, 128, 0.4), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.h4 { box-shadow: inset 0 0 0 2px rgba(96, 165, 250, 0.45), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.h5 { box-shadow: inset 0 0 0 2px rgba(192, 132, 252, 0.45), inset 0 2px 3px rgba(0, 0, 0, 0.55); }
  .hole.last { box-shadow: inset 0 0 0 100vmax rgba(45, 212, 191, 0.28); }
  .hole.can { box-shadow: inset 0 0 0 2px rgba(251, 191, 36, 0.85); }
  .hole.sel { box-shadow: inset 0 0 0 100vmax rgba(59, 130, 246, 0.45); }
  .hole.dot::after {
    content: "";
    position: absolute;
    width: 44%;
    height: 44%;
    border-radius: 50%;
    background: rgba(241, 245, 249, 0.35);
  }
  .pc {
    width: 86%;
    height: 86%;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.45), inset 0 -3px 0 rgba(0, 0, 0, 0.3), inset 0 2px 0 rgba(255, 255, 255, 0.2);
  }
  /* Marble colours, by home corner: bottom, lower-right, upper-right, top, upper-left, lower-left */
  .pc.c0, .disc.c0 { background: radial-gradient(circle at 35% 30%, #f87171, #b91c1c 70%); }
  .pc.c1, .disc.c1 { background: radial-gradient(circle at 35% 30%, #fdba74, #c2410c 70%); }
  .pc.c2, .disc.c2 { background: radial-gradient(circle at 35% 30%, #fde047, #a16207 70%); }
  .pc.c3, .disc.c3 { background: radial-gradient(circle at 35% 30%, #86efac, #15803d 70%); }
  .pc.c4, .disc.c4 { background: radial-gradient(circle at 35% 30%, #93c5fd, #1d4ed8 70%); }
  .pc.c5, .disc.c5 { background: radial-gradient(circle at 35% 30%, #d8b4fe, #7e22ce 70%); }
  .disc {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex: 0 0 auto;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.3), inset 0 2px 0 rgba(255, 255, 255, 0.18);
  }
  .drag-ghost {
    position: absolute;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    transform: scale(1.12);
    filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.5));
    will-change: left, top;
  }
  .fly {
    position: absolute;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    transition: transform 0.2s ease;
    will-change: transform;
  }
  /* The computer's hand (js/shared/robot-hand.js): reaches down over the
     marble, closes around it, carries it through every hop of the chain, then
     opens again. It lives in #wrap rather than #board so reaching in from
     above isn't clipped. */
  .hand {
    position: absolute;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.16s ease;
    will-change: transform, opacity;
  }
  .hand.in { opacity: 1; }
  .hand .held {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(1.12); /* lifted off the board, like a dragged marble */
    filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.5));
  }
  .hand .mitt {
    position: absolute;
    left: 50%;
    top: 50%;
    font-size: calc(var(--hole) * 1.35);
    line-height: 1;
    transform: translate(-50%, -92%) rotate(180deg); /* reaching down from above */
    transition: transform 0.19s ease;
    filter: drop-shadow(0 3px 4px rgba(0, 0, 0, 0.5));
  }
  .hand.in .mitt { transform: translate(-50%, -62%) rotate(180deg); }
  #controls { display: flex; gap: 10px; width: var(--board); }
  button {
    flex: 1;
    padding: 12px;
    border: 2px solid rgba(255, 255, 255, 0.14);
    border-radius: 12px;
    background: var(--panel);
    color: var(--text);
    font: 700 15px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    cursor: pointer;
    touch-action: manipulation;
  }
  button:active { background: #34405f; }
  button:disabled { opacity: 0.4; }
  .winbanner {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: clamp(36px, 11vmin, 72px);
    font-weight: 800;
    color: #fbbf24;
    text-shadow: 0 3px 12px rgba(0, 0, 0, 0.7);
    z-index: 6;
    pointer-events: none;
    animation: pop 0.5s cubic-bezier(0.2, 2.2, 0.4, 1);
  }
  @keyframes pop { from { transform: scale(0.2); opacity: 0; } to { transform: scale(1); opacity: 1; } }
  #overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(10, 12, 26, 0.88);
    -webkit-backdrop-filter: blur(5px);
    backdrop-filter: blur(5px);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    z-index: 5;
  }
  #overlay.hidden { display: none; }
  #overlay h1 { font-size: 28px; font-weight: 800; }
  #overlay .row { display: flex; gap: 10px; width: 100%; max-width: 320px; }
  #overlay .row button.on { border-color: var(--accent); background: #1d3a38; }
  #overlay label { color: var(--muted); font-size: 14px; }
  #overlay label.opt { display: flex; align-items: center; gap: 8px; cursor: pointer; }
  #overlay label.opt input { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; }
  #overlay input[type=range] { width: 100%; max-width: 320px; }
  #lvl-label { font-size: 20px; font-weight: 800; color: var(--accent); }
  #ov-msg { color: var(--muted); font-size: 15px; line-height: 1.5; }