:root {
  --bg: #0f1220;
  --bg2: #171b2e;
  --card: #1e2338;
  --ink: #eef1fb;
  --muted: #98a0c0;
  --accent: #6ea8fe;
  --p0: #4f8cff;   /* you / player 0 - blue */
  --p1: #ff5d6c;   /* opponent / player 1 - red */
  --p0-dim: #2a3a63;
  --p1-dim: #5c2b34;
  --gold: #ffd76a;
  --line: #2b3150;
  --ok: #57d998;
  --err: #ff7b8a;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(1200px 800px at 50% -10%, #232a48 0%, var(--bg) 60%);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app { min-height: 100%; display: flex; align-items: center; justify-content: center; padding: 20px; }
.screen { width: 100%; max-width: 520px; }
.hidden { display: none !important; }

.logo {
  font-size: 56px; letter-spacing: 10px; text-align: center; margin: 10px 0 4px;
  background: linear-gradient(90deg, var(--p0), var(--gold), var(--p1));
  -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 800;
}
.tagline { text-align: center; color: var(--muted); margin: 0 0 22px; }

.card {
  background: linear-gradient(180deg, var(--card), var(--bg2));
  border: 1px solid var(--line); border-radius: 16px; padding: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field span { color: var(--muted); font-size: 13px; }
input, select {
  background: #12162a; border: 1px solid var(--line); color: var(--ink);
  border-radius: 10px; padding: 12px 14px; font-size: 16px; outline: none; width: 100%;
}
input:focus, select:focus { border-color: var(--accent); }
select { width: auto; }

.btn-row { margin: 8px 0; }
button {
  cursor: pointer; border: 1px solid var(--line); background: #232a45; color: var(--ink);
  border-radius: 10px; padding: 12px 16px; font-size: 15px; font-weight: 600; width: 100%;
  transition: transform .05s ease, background .15s ease, border-color .15s;
}
button:hover { background: #2b3352; }
button:active { transform: translateY(1px); }
button.primary { background: linear-gradient(90deg, var(--p0), #8a6bff); border: none; }
button.primary:hover { filter: brightness(1.07); }
button.ghost { width: auto; background: transparent; border-color: transparent; color: var(--muted); }
button.ghost:hover { background: #232a45; color: var(--ink); }

.ai-opts { display: flex; justify-content: center; gap: 10px; color: var(--muted); font-size: 14px; margin: 6px 0 2px; }
.ai-opts label { display: flex; align-items: center; gap: 8px; }
hr { border: none; border-top: 1px solid var(--line); margin: 18px 0; }
.join-row { display: flex; gap: 8px; }
.join-row input { text-transform: uppercase; letter-spacing: 4px; font-weight: 700; text-align: center; }
.join-row button { width: auto; white-space: nowrap; }
.error { color: var(--err); min-height: 18px; margin: 10px 0 0; font-size: 14px; text-align: center; }

.rules { margin: 18px 4px; color: var(--muted); }
.rules summary { cursor: pointer; color: var(--ink); font-weight: 600; }
.rules ul { line-height: 1.6; font-size: 14px; padding-left: 18px; }
.footnote { text-align: center; color: #6b7196; font-size: 12px; margin-top: 18px; }

/* ===== Game ===== */
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.room-info { font-weight: 700; letter-spacing: 2px; color: var(--muted); }
.status { text-align: center; font-size: 18px; font-weight: 700; min-height: 26px; margin-bottom: 12px; }
.status.you { color: var(--p0); }
.status.opp { color: var(--p1); }

.board-wrap { display: flex; justify-content: center; }
.board {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(7, 1fr);
  gap: 4px;
  width: min(92vw, 480px); aspect-ratio: 1 / 1;
  background: #0c0f1c; padding: 8px; border-radius: 14px; border: 1px solid var(--line);
  touch-action: manipulation;
}
.cell { min-width: 0; min-height: 0; }
.cell {
  position: relative; border-radius: 8px; background: #151a30;
  display: flex; align-items: center; justify-content: center;
}
.cell.home0 { background: #14203a; }
.cell.home1 { background: #33202a; }
.cell.selectable { outline: 2px solid var(--gold); cursor: pointer; }
.cell.target { cursor: pointer; }
.cell.target::after {
  content: ""; position: absolute; inset: 0; border-radius: 8px;
  border: 2px dashed var(--ok); background: rgba(87,217,152,.12);
}
.cell.target.capture::after { border-color: var(--err); background: rgba(255,123,138,.16); }
.cell.target.jump::after { border-color: var(--accent); background: rgba(110,168,254,.16); }
.cell.lastfrom { box-shadow: inset 0 0 0 2px rgba(255,215,106,.35); }
.cell.lastto { box-shadow: inset 0 0 0 2px rgba(255,215,106,.7); }
.cell.hint { outline: 3px solid var(--gold); animation: pulse 1s ease-in-out 3; }
@keyframes pulse { 50% { outline-color: #fff2c0; } }

.die {
  width: 82%; height: 82%; border-radius: 22%; position: relative;
  display: grid; grid-template-columns: repeat(3,1fr); grid-template-rows: repeat(3,1fr);
  padding: 12%; box-shadow: 0 3px 0 rgba(0,0,0,.35), inset 0 2px 3px rgba(255,255,255,.25);
}
.die.p0 { background: linear-gradient(160deg, #6ea0ff, #3f6fd8); }
.die.p1 { background: linear-gradient(160deg, #ff7d89, #e0424f); }
.pip { border-radius: 50%; background: #10131f; align-self: center; justify-self: center; width: 74%; height: 74%; }
.die.p1 .pip { background: #2a0d12; }
/* pip positions in a 3x3 grid */
.p-tl { grid-area: 1/1; } .p-tc { grid-area: 1/2; } .p-tr { grid-area: 1/3; }
.p-ml { grid-area: 2/1; } .p-mc { grid-area: 2/2; } .p-mr { grid-area: 2/3; }
.p-bl { grid-area: 3/1; } .p-bc { grid-area: 3/2; } .p-br { grid-area: 3/3; }

.die.selected { transform: scale(1.05); box-shadow: 0 0 0 3px var(--gold), 0 4px 0 rgba(0,0,0,.35); }

.scorebar { display: flex; justify-content: space-between; margin: 14px 4px 0; }
.score { display: flex; align-items: center; gap: 8px; color: var(--muted); font-weight: 600; }
.score .dot { width: 12px; height: 12px; border-radius: 50%; }
.score.you .dot { background: var(--p0); }
.score.opp .dot { background: var(--p1); }

.game-over { text-align: center; margin-top: 16px; }
.game-over #go-text { font-size: 22px; font-weight: 800; margin-bottom: 12px; }
.game-over.win #go-text { color: var(--ok); }
.game-over.lose #go-text { color: var(--err); }
.game-over button { width: auto; padding: 12px 28px; }

.waiting { text-align: center; margin-top: 20px; color: var(--muted); }
.big-code {
  font-size: 44px; font-weight: 800; letter-spacing: 10px; color: var(--gold);
  margin: 10px 0; user-select: all;
}
.muted { color: var(--muted); }