:root {
  --bg: #080a18;
  --panel: rgba(14, 17, 40, 0.86);
  --edge: rgba(120, 135, 255, 0.35);
  --text: #eef0ff;
  --muted: #9aa2d6;
  --you: #38d6ff;
  --bot: #ff5266;
  --gold: #ffd166;
  --accent: #b388ff;
  --accent-2: #6c7cff;
  --pit: #14183a;
  --pit-edge: rgba(150, 165, 255, 0.28);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}
[hidden] { display: none !important; }
button { font: inherit; }

/* ---------- Screens ---------- */
.screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: max(18px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(26px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  background: radial-gradient(ellipse at center top, rgba(108, 124, 255, 0.14), transparent 60%), var(--bg);
}
#home { padding-top: max(24px, 6vh); }
#play { justify-content: center; }

.panel {
  width: min(460px, 100%);
  padding: 24px 20px 18px;
  border-radius: 22px;
  background: var(--panel);
  border: 1px solid var(--edge);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  text-align: center;
  animation: rise 0.35s ease-out;
}
@keyframes rise { from { opacity: 0; transform: translateY(14px) scale(0.98); } to { opacity: 1; transform: none; } }

.back-link {
  display: block;
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  text-align: left;
}
.back-link.center { text-align: center; margin: 10px 0 0; }
.back-link:hover { color: var(--text); }

.logo {
  margin: 0;
  font-size: clamp(30px, 9vw, 44px);
  font-weight: 950;
  line-height: 1.05;
  letter-spacing: 0.01em;
}
.logo span {
  display: block;
  font-size: 0.55em;
  font-weight: 800;
  background: linear-gradient(90deg, var(--you), #b9a8ff 50%, var(--bot));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-top: 4px;
}
.hook { margin: 10px 0 18px; color: var(--muted); font-size: 15px; line-height: 1.4; }

.settings { display: grid; gap: 10px; margin-bottom: 18px; }
.setting { display: grid; gap: 6px; text-align: left; }
.setting-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); font-weight: 700; }
.seg { display: flex; gap: 6px; flex-wrap: wrap; }
.seg button {
  flex: 1 1 0;
  min-height: 44px;
  padding: 10px 4px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.seg button:active { transform: scale(0.97); }
.seg button.on { background: rgba(179, 136, 255, 0.26); border-color: var(--accent); }

.primary-btn {
  width: 100%;
  min-height: 52px;
  padding: 14px;
  border: 0;
  border-radius: 16px;
  font-size: 20px;
  font-weight: 950;
  letter-spacing: 0.1em;
  color: #fff;
  background: linear-gradient(90deg, #7c5cff, #b388ff 55%, #38d6ff);
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.4);
  cursor: pointer;
  animation: breathe 1.8s ease-in-out infinite;
}
@keyframes breathe { 50% { transform: scale(1.025); box-shadow: 0 12px 40px rgba(124, 92, 255, 0.6); } }
.secondary-btn {
  width: 100%;
  min-height: 46px;
  margin-top: 10px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--edge);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
}
.row { display: flex; gap: 10px; }
.row .secondary-btn { margin-top: 0; }
.text-btn {
  min-height: 44px;
  margin-top: 8px;
  padding: 0 12px;
  background: none;
  border: 0;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.howto { margin: 14px 0 0; font-size: 13px; color: var(--muted); line-height: 1.6; }
.record { margin: 10px 0 0; font-size: 13px; color: var(--gold); min-height: 1em; }

/* ---------- HUD ---------- */
.hud {
  width: min(720px, 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(10, 12, 30, 0.75);
  border: 1px solid var(--edge);
  font-weight: 800;
  letter-spacing: 0.04em;
  font-size: 15px;
}
.hud b { font-size: 20px; }
.side.you { color: var(--you); }
.side.bot { color: var(--bot); }
.hud-actions { display: flex; gap: 6px; }
.chip-btn {
  min-height: 40px;
  min-width: 40px;
  padding: 0 12px;
  border-radius: 12px;
  border: 1px solid var(--edge);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
  cursor: pointer;
}

/* ---------- Board ---------- */
.stage { position: relative; width: min(720px, 100%); }
.board {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 96px 1fr 96px;
  grid-template-rows: 1fr 1fr;
  gap: 12px;
  padding: 16px;
  border-radius: 28px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(108, 124, 255, 0.22), transparent 65%),
    linear-gradient(180deg, #111634, #0b0e24);
  border: 1px solid rgba(150, 165, 255, 0.3);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55), inset 0 2px 0 rgba(255, 255, 255, 0.05);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
.row { min-width: 0; }
.bot-row { grid-column: 2; grid-row: 1; display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }
.player-row { grid-column: 2; grid-row: 2; display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }

.store {
  grid-row: 1 / 3;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 999px;
  background: var(--pit);
  border: 1px solid var(--pit-edge);
  box-shadow: inset 0 6px 20px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  min-height: 0;
}
.store.bot-store { grid-column: 1; border-color: rgba(255, 82, 102, 0.35); }
.store.player-store { grid-column: 3; border-color: rgba(56, 214, 255, 0.35); }
.store.target { box-shadow: inset 0 0 0 2px var(--gold), 0 0 22px rgba(255, 209, 102, 0.45); }
.store-title { font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); font-weight: 800; z-index: 2; }
.store-count { font-size: 26px; font-weight: 950; z-index: 2; text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8); }
.store-gems { position: absolute; inset: 0; pointer-events: none; }
.store.drop { animation: storeFlash 0.4s ease-out; }
@keyframes storeFlash { 0% { filter: brightness(1.8); } 100% { filter: none; } }

.pit {
  position: relative;
  min-width: 0;
  width: 100%;
  aspect-ratio: 1 / 1;
  min-height: 44px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--pit-edge);
  background: radial-gradient(circle at 50% 40%, #1c2150, var(--pit) 70%);
  box-shadow: inset 0 6px 14px rgba(0, 0, 0, 0.6);
  color: var(--text);
  cursor: default;
  transition: transform 0.12s, box-shadow 0.15s, border-color 0.15s;
}
.pit-gems { position: absolute; inset: 0; pointer-events: none; }
.pit-count {
  position: absolute;
  right: 3px;
  bottom: 0;
  font-size: 12px;
  font-weight: 900;
  color: var(--muted);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
  pointer-events: none;
  z-index: 2;
}
.pit.empty .pit-count { opacity: 0.45; }
.pit .pit-count { font-size: clamp(11px, 2.4vw, 14px); }

.bot-row .pit { border-color: rgba(255, 82, 102, 0.28); }
.player-row .pit { border-color: rgba(56, 214, 255, 0.28); }

.pit.legal {
  cursor: pointer;
  border-color: var(--you);
  box-shadow: inset 0 6px 14px rgba(0, 0, 0, 0.5), 0 0 16px rgba(56, 214, 255, 0.45);
}
.pit.legal:hover, .pit.legal:focus-visible { transform: translateY(-2px) scale(1.04); outline: none; border-color: #bff1ff; }
.pit.legal:focus-visible { box-shadow: 0 0 0 3px var(--gold); }
.pit.legal:active { transform: scale(0.96); }
.pit.preview { border-color: var(--gold); }
.pit.target { box-shadow: inset 0 0 0 3px var(--gold), 0 0 22px rgba(255, 209, 102, 0.55); }
.pit.last { animation: lastPulse 0.9s ease-out; }
@keyframes lastPulse { 0% { box-shadow: 0 0 0 0 rgba(179, 136, 255, 0.8); } 100% { box-shadow: 0 0 0 14px rgba(179, 136, 255, 0); } }
.pit.drop { animation: pitBump 0.2s ease-out; }
@keyframes pitBump { 0% { transform: scale(1.12); } 100% { transform: none; } }

/* 宝石（seed）：径向渐变做出玻璃质感 */
.gem {
  position: absolute;
  width: 26%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at 34% 30%, #ffffff 0 8%, var(--c) 30%, rgba(8, 10, 24, 0.9) 105%);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
}
.store .gem { width: 11%; }
.gem.g0 { --c: #38d6ff; }
.gem.g1 { --c: #ff5fa2; }
.gem.g2 { --c: #ffd166; }
.gem.g3 { --c: #5dffb0; }
.gem.g4 { --c: #b388ff; }
.gem.g5 { --c: #ff8a3d; }

.board.bot-turn .bot-row { filter: drop-shadow(0 0 6px rgba(255, 82, 102, 0.25)); }
.board.player-turn .player-row { filter: drop-shadow(0 0 6px rgba(56, 214, 255, 0.25)); }

/* 竖屏手机：棋盘竖着放，仓在上下两端 */
@media (max-width: 640px) and (orientation: portrait) {
  .board {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
    gap: 10px;
    padding: 12px;
  }
  .bot-row, .player-row { grid-column: 1; }
  .bot-row { grid-row: 2; }
  .player-row { grid-row: 3; }
  .store { grid-row: auto; grid-column: 1; flex-direction: row; gap: 12px; height: 60px; border-radius: 999px; }
  .store.bot-store { grid-row: 1; }
  .store.player-store { grid-row: 4; }
  .store-title { font-size: 10px; }
  .store-count { font-size: 22px; }
  .store .gem { width: 6%; }
  .bot-row, .player-row { gap: 7px; }
  .pit-count { font-size: 12px; }
}

.stage { display: flex; justify-content: center; }
.banner {
  position: absolute;
  left: 0;
  right: 0;
  top: 40%;
  text-align: center;
  font-weight: 900;
  font-size: clamp(26px, 7vw, 46px);
  letter-spacing: 0.02em;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.85);
  pointer-events: none;
  opacity: 0;
}
.banner b { font-weight: 900; color: var(--gold); }
.banner.show { animation: pop 1.1s ease-out forwards; }
@keyframes pop {
  0% { opacity: 0; transform: scale(1.5); }
  14% { opacity: 1; transform: scale(1); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: scale(0.96); }
}

.status {
  margin: 0;
  min-height: 1.4em;
  font-size: 15px;
  font-weight: 700;
  color: var(--muted);
  text-align: center;
}
.status.you { color: var(--you); }
.status.bot { color: var(--bot); }
.hint {
  margin: -6px 0 0;
  min-height: 1.3em;
  font-size: 13px;
  color: var(--gold);
  text-align: center;
  max-width: 560px;
}

/* ---------- Result ---------- */
.result-title { margin: 0; font-size: clamp(38px, 11vw, 54px); font-weight: 950; letter-spacing: 0.05em; }
.result-title.win { color: var(--gold); text-shadow: 0 0 30px rgba(255, 209, 102, 0.45); }
.result-title.lose { color: var(--bot); text-shadow: 0 0 30px rgba(255, 82, 102, 0.45); }
.result-title.draw { color: var(--accent); text-shadow: 0 0 30px rgba(179, 136, 255, 0.45); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 6px 0 14px; }
.stats div { padding: 10px 4px; border-radius: 12px; background: rgba(255, 255, 255, 0.04); }
.stats b { display: block; font-size: 20px; }
.stats span { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.challenge { margin: 0 0 14px; color: var(--gold); font-weight: 700; }

.toast {
  position: fixed;
  left: 50%;
  bottom: max(30px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  max-width: calc(100% - 32px);
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(20, 24, 52, 0.95);
  border: 1px solid var(--edge);
  font-size: 14px;
  z-index: 10;
}

/* ---------- About article ---------- */
.about {
  width: min(640px, 100%);
  padding: 22px;
  border-radius: 18px;
  background: rgba(12, 14, 34, 0.95);
  border: 1px solid rgba(120, 135, 255, 0.18);
  color: var(--muted);
  line-height: 1.65;
  font-size: 15px;
  user-select: text;
  -webkit-user-select: text;
  margin-bottom: 12px;
}
.about h2, .about h3 { color: var(--text); margin: 18px 0 8px; }
.about h2 { margin-top: 0; font-size: 22px; }
.about h3 { font-size: 17px; }
.about p { margin: 0 0 10px; }
.about ul { padding-left: 20px; margin: 0; }
.about li { margin-bottom: 6px; }
.about strong { color: var(--text); }
.about details { padding: 10px 0; border-top: 1px solid rgba(255, 255, 255, 0.06); }
.about summary { color: var(--text); cursor: pointer; font-weight: 600; }
.about details p { margin: 8px 0 0; }
.about a { color: var(--you); }
.about .more { margin: 16px 0 0; }

/* ---------- Small phones ---------- */
@media (max-width: 380px) {
  .hud { font-size: 13px; }
  .hud b { font-size: 17px; }
  .seg button { font-size: 13px; }
}