/* Reversi 前端样式 — 沿用 connect-four / gobang 2026-09-12 深色玻璃 + 蓝金霓虹风 */

:root {
  --rv-bg: #0f172a;
  --rv-blue: #3b82f6;
  --rv-gold: #f59e0b;
  --rv-text: #f8fafc;
  --rv-muted: #94a3b8;
  --rv-glass: rgba(15, 23, 42, 0.65);
  --rv-glass-light: rgba(255, 255, 255, 0.05);
  --rv-border: rgba(148, 163, 184, 0.2);
  --rv-disc-black: #0f172a;
  --rv-disc-white: #f8fafc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--rv-text);
  min-height: 100vh;
  overflow-x: hidden;
}

.rv-particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(245, 158, 11, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 20px 40px;
  position: relative;
  z-index: 1;
}

.rv-back-wrap { padding: 16px 20px; }
.rv-back {
  color: var(--rv-blue);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.5px;
  transition: color 0.2s;
}
.rv-back:hover { color: var(--rv-gold); }

.rv-head {
  text-align: center;
  margin-bottom: 24px;
}
.rv-head h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--rv-blue), var(--rv-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0;
}
.rv-head .sub {
  color: var(--rv-muted);
  font-size: 13px;
  letter-spacing: 0.5px;
  margin-top: 6px;
}

/* ===== 先手选择 ===== */
.rv-side-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 28px;
}
.rv-side-btn {
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid var(--rv-border);
  background: var(--rv-glass);
  color: var(--rv-blue);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.2s;
}
.rv-side-btn.active {
  background: var(--rv-blue);
  color: #fff;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
  border-color: var(--rv-blue);
}
.rv-side-btn.gold { color: var(--rv-gold); }
.rv-side-btn.gold.active {
  background: var(--rv-gold);
  color: #0f172a;
  border-color: var(--rv-gold);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
}

/* ===== 游戏区 ===== */
.rv-game {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 24px;
  align-items: start;
}

@media (max-width: 768px) {
  .rv-game { grid-template-columns: 1fr; }
}

/* ===== 棋盘 ===== */
.rv-board-wrap {
  background: var(--rv-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--rv-border);
  border-radius: 16px;
  padding: 18px;
  position: relative;
  transition: box-shadow 0.4s;
}
.rv-board-wrap.thinking {
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
}
.rv-board-wrap.stage-win {
  box-shadow: 0 0 40px rgba(34, 197, 94, 0.4);
}
.rv-board-wrap.stage-lose {
  box-shadow: 0 0 40px rgba(239, 68, 68, 0.4);
}
.rv-board-wrap.stage-draw {
  box-shadow: 0 0 40px rgba(245, 158, 11, 0.4);
}

.rv-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  background: rgba(0, 0, 0, 0.35);
  padding: 6px;
  border-radius: 10px;
  aspect-ratio: 1;
}
.rv-cell {
  aspect-ratio: 1;
  background: rgba(15, 23, 42, 0.7);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  position: relative;
  transition: background 0.15s;
}
.rv-cell-legal {
  background: rgba(59, 130, 246, 0.12);
  cursor: pointer;
}
.rv-cell-legal:hover {
  background: rgba(59, 130, 246, 0.25);
}
.rv-cell-disabled {
  cursor: not-allowed;
}

.rv-disc {
  width: 88%;
  height: 88%;
  border-radius: 50%;
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.5), 0 2px 6px rgba(0, 0, 0, 0.3);
  animation: rv-drop 0.25s ease-out;
}
.rv-disc-black {
  background: radial-gradient(circle at 30% 30%, #475569, var(--rv-disc-black));
  border: 1px solid var(--rv-disc-black);
}
.rv-disc-white {
  background: radial-gradient(circle at 30% 30%, #ffffff, #cbd5e1);
  border: 1px solid #cbd5e1;
}
.rv-disc.is-ai {
  /* AI 落子时金色霓虹 0.4s */
  animation: rv-drop 0.25s ease-out, rv-ai-glow 0.4s ease-out;
}

@keyframes rv-drop {
  0%   { transform: scale(0.4); opacity: 0; }
  60%  { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes rv-ai-glow {
  0%   { box-shadow: 0 0 0 rgba(245, 158, 11, 0), inset 0 0 8px rgba(0,0,0,0.5); }
  50%  { box-shadow: 0 0 16px rgba(245, 158, 11, 0.8), inset 0 0 8px rgba(0,0,0,0.5); }
  100% { box-shadow: inset 0 0 8px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3); }
}

.rv-status {
  text-align: center;
  font-size: 13px;
  color: var(--rv-muted);
  padding-top: 12px;
  letter-spacing: 0.5px;
}

/* ===== 侧边面板 ===== */
.rv-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.rv-score {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.rv-score-card {
  background: var(--rv-glass);
  border: 1px solid var(--rv-border);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
}
.rv-score-card .l {
  font-size: 11px;
  color: var(--rv-muted);
  letter-spacing: 1px;
}
.rv-score-card .v {
  font-size: 26px;
  font-weight: 800;
  margin-top: 4px;
}
.rv-score-card.is-black .v { color: var(--rv-disc-white); }
.rv-score-card.is-white .v { color: var(--rv-disc-black); }

.rv-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.rv-stat-card {
  background: var(--rv-glass);
  border: 1px solid var(--rv-border);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
}
.rv-stat-card .l { font-size: 11px; color: var(--rv-muted); letter-spacing: 1px; }
.rv-stat-card .v {
  font-size: 22px;
  font-weight: 700;
  margin-top: 4px;
}
.rv-stat-card.is-time .v { font-family: 'Courier New', monospace; }
.rv-stat-card small { font-size: 12px; font-weight: 400; color: var(--rv-muted); margin-left: 4px; }
.rv-stat-card.is-best .v { font-size: 13px; font-weight: 500; color: var(--rv-gold); }

.rv-actions {
  display: flex;
  gap: 8px;
}
.rv-btn {
  flex: 1;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--rv-border);
  background: var(--rv-glass);
  color: var(--rv-text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.2s;
}
.rv-btn:hover:not(:disabled) {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--rv-blue);
}
.rv-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.rv-btn.primary {
  background: linear-gradient(135deg, var(--rv-blue), #6366f1);
  border-color: var(--rv-blue);
}
.rv-btn.danger {
  color: #fca5a5;
}

.rv-status-info {
  text-align: center;
  font-size: 12px;
  color: var(--rv-muted);
  padding: 6px 0;
  min-height: 18px;
}

/* ===== Modal ===== */
.rv-modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  animation: rv-fade-in 0.2s ease-out;
}
.rv-modal-mask.show { display: flex; }
@keyframes rv-fade-in { from { opacity: 0; } to { opacity: 1; } }

.rv-modal {
  background: var(--rv-glass);
  border: 1px solid var(--rv-border);
  border-radius: 18px;
  padding: 28px 32px;
  width: min(420px, 90vw);
  text-align: center;
  backdrop-filter: blur(14px);
  animation: rv-modal-pop 0.3s ease-out;
}
@keyframes rv-modal-pop {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.rv-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.18);
  color: var(--rv-gold);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.rv-modal h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 4px;
  margin: 12px 0 4px;
}
.rv-modal h2.win   { color: #86efac; }
.rv-modal h2.lose  { color: #fca5a5; }
.rv-modal h2.draw  { color: var(--rv-gold); }
.rv-modal .sub { color: var(--rv-muted); font-size: 13px; margin-bottom: 18px; }

.rv-modal .result {
  display: grid;
  gap: 8px;
  margin: 16px 0 20px;
}
.rv-modal .r {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
}
.rv-modal .r .l { color: var(--rv-muted); font-size: 12px; }
.rv-modal .r .v { font-weight: 700; }

.rv-modal .actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ===== Toast ===== */
.rv-toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--rv-glass);
  border: 1px solid rgba(245, 158, 11, 0.5);
  color: var(--rv-gold);
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 1px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 998;
}
.rv-toast.show { opacity: 1; }