/* ============================================================
   NEON XIANGQI - Stylesheet (sci-fi / electronic theme)
   ============================================================ */
:root {
  --bg0: #04060d;
  --bg1: #0a1020;
  --grid: #1de9ff;
  --grid-dim: rgba(29, 233, 255, 0.28);
  --red: #ff3b6b;
  --red-glow: rgba(255, 59, 107, 0.75);
  --blue: #21e6ff;
  --blue-glow: rgba(33, 230, 255, 0.75);
  --accent: #ff2bd6;
  --text: #d6f4ff;
  --muted: #6f8ba5;
  --panel: rgba(10, 18, 34, 0.82);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(1200px 800px at 50% -10%, #0c1830 0%, transparent 60%),
    radial-gradient(900px 700px at 90% 110%, #160a26 0%, transparent 55%),
    var(--bg0);
  color: var(--text);
  font-family: 'Orbitron', 'Rajdhani', 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); }

#app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 16px 60px;
}

header.title {
  text-align: center;
  margin-bottom: 10px;
}
header.title h1 {
  font-size: clamp(26px, 5vw, 44px);
  letter-spacing: 6px;
  margin: 6px 0 2px;
  background: linear-gradient(90deg, var(--red), var(--accent), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 24px rgba(255, 43, 214, 0.25);
}
header.title .sub {
  color: var(--muted);
  letter-spacing: 3px;
  font-size: 12px;
  text-transform: uppercase;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 18px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
}

.board-wrap {
  position: relative;
  background:
    linear-gradient(180deg, rgba(13,24,46,0.9), rgba(6,10,20,0.95));
  border: 1px solid rgba(29, 233, 255, 0.25);
  border-radius: 14px;
  padding: 10px;
  box-shadow: 0 0 40px rgba(33, 230, 255, 0.08), inset 0 0 60px rgba(0,0,0,0.5);
  overflow: hidden;
}
.board-wrap::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, rgba(255,255,255,0.025) 0 1px, transparent 1px 3px);
  pointer-events: none;
  mix-blend-mode: overlay;
}
canvas#board {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  cursor: pointer;
  touch-action: none;
}

.status-bar {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.turn-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 1px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(29,233,255,0.3);
  background: rgba(8,16,30,0.7);
}
.turn-dot {
  width: 12px; height: 12px; border-radius: 50%;
  box-shadow: 0 0 10px currentColor;
}
.turn-dot.red { background: var(--red); color: var(--red); }
.turn-dot.blue { background: var(--blue); color: var(--blue); }

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card {
  background: var(--panel);
  border: 1px solid rgba(29, 233, 255, 0.18);
  border-radius: 12px;
  padding: 14px;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue);
}
.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
button.btn {
  flex: 1 1 auto;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 1px;
  color: var(--text);
  background: linear-gradient(180deg, rgba(33,230,255,0.16), rgba(33,230,255,0.04));
  border: 1px solid rgba(33, 230, 255, 0.4);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
  text-transform: uppercase;
  transition: transform .08s ease, box-shadow .2s ease, background .2s ease;
}
button.btn:hover {
  box-shadow: 0 0 18px rgba(33, 230, 255, 0.35);
  transform: translateY(-1px);
}
button.btn:active { transform: translateY(0); }
button.btn.active {
  background: linear-gradient(180deg, rgba(255,43,214,0.30), rgba(255,43,214,0.08));
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(255,43,214,0.4);
}
button.btn.small { flex: 0 0 auto; padding: 8px 10px; }

.seg {
  display: flex; gap: 6px;
}
.seg .btn { flex: 1; }

.legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
  font-size: 12px;
  color: var(--muted);
}
.legend .it { display: flex; align-items: center; gap: 6px; }
.legend .sw {
  width: 14px; height: 14px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.4);
  flex: 0 0 auto;
}
.legend .sw.red { background: rgba(255,59,107,0.25); border-color: var(--red); }
.legend .sw.blue { background: rgba(33,230,255,0.25); border-color: var(--blue); }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(2,4,10,0.82);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center; justify-content: center;
  padding: 18px;
  z-index: 50;
}
.modal-overlay.show { display: flex; }
.modal {
  width: min(720px, 100%);
  max-height: 86vh;
  overflow: auto;
  background: linear-gradient(180deg, #0a1426, #060b16);
  border: 1px solid rgba(33,230,255,0.35);
  border-radius: 14px;
  box-shadow: 0 0 50px rgba(33,230,255,0.18);
  padding: 22px 24px;
}
.modal h2 {
  margin-top: 0;
  letter-spacing: 3px;
  color: var(--blue);
}
.modal h3 { color: var(--accent); letter-spacing: 1px; margin-top: 18px; }
.modal p, .modal li { line-height: 1.6; color: var(--text); font-size: 14px; }
.modal .keys { color: var(--muted); font-size: 13px; }
.modal .close-x {
  float: right; cursor: pointer; border: none; background: none;
  color: var(--muted); font-size: 22px; font-family: inherit;
}
table.pieces {
  width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13px;
}
table.pieces th, table.pieces td {
  border: 1px solid rgba(29,233,255,0.2);
  padding: 6px 8px; text-align: left;
}
table.pieces th { color: var(--blue); }

.footer-note {
  text-align: center; color: var(--muted); font-size: 11px;
  letter-spacing: 1px; margin-top: 26px;
}

/* Captured-pieces trays (above / below the board) */
.tray {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 5px 8px;
  margin: 0 auto;
}
.tray-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  margin-right: 8px;
  opacity: 0.75;
}
.tray .chip {
  position: relative;
  width: 38px;
  height: 34px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  flex: 0 0 auto;
}
.tray .chip svg {
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 100%;
  filter: drop-shadow(0 0 3px rgba(33, 230, 255, 0.4));
}
.tray .chip .gly {
  position: relative;
  font-family: "KaiTi","STKaiti","Kaiti SC","DFKai-SB","楷体",serif;
  font-weight: 400;
  font-size: 21px;
  line-height: 1;
}
.tray .chip.red .gly { color: var(--red); }
.tray .chip.blue .gly { color: var(--blue); }

/* Fullscreen: enlarge the board area to fill the screen */
#boardWrap:fullscreen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100vw;
  height: 100vh;
  background: #04060d;
  border: none;
  border-radius: 0;
  padding: 0;
}
#boardWrap:fullscreen canvas#board {
  width: auto;
  height: calc(100vh - 90px);
  max-width: 100vw;
}

/* Banner for win/lose */
.banner {
  position: absolute; inset: 0;
  display: none;
  align-items: center; justify-content: center;
  flex-direction: column;
  background: rgba(4,6,13,0.55);
  backdrop-filter: blur(2px);
  z-index: 5;
}
.banner.show { display: flex; }
.banner .big {
  font-size: clamp(30px, 7vw, 64px);
  letter-spacing: 6px;
  text-shadow: 0 0 30px currentColor;
}
.banner.win .big { color: var(--blue); }
.banner.lose .big { color: var(--red); }
.banner .sub2 { color: var(--text); margin: 8px 0 16px; letter-spacing: 2px; }