/* ============================================================
   AIChess — Dark Terminal 风格 + 微信 X5 适配
   与 SupersupErChik 个人主页配套
   ============================================================ */

:root {
  --bg:        #0d0d0d;
  --bg-alt:    #121212;
  --text:      #b0b0b0;
  --text-dim:  #5c5c5c;
  --text-hi:   #e8e8e8;
  --green:     #4faf4f;
  --green-dim: #2a5a2a;
  --amber:     #d7af5f;
  --amber-dim: #7a652f;
  --cyan:      #5fafaf;
  --border:    #1f1f1f;

  --font-display: 'Syne', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --sz-huge: clamp(1.6rem, 4vw, 2.6rem);
  --sz-big:  clamp(1.1rem, 2vw, 1.5rem);
  --sz-md:   0.95rem;
  --sz-sm:   0.85rem;
  --sz-xs:   0.72rem;
}

/* ========== Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-mono);
  font-size: var(--sz-md);
  color: var(--text);
  background: var(--bg);
  min-height: 100dvh;
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  touch-action: manipulation;
  overscroll-behavior-y: contain;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-overflow-scrolling: touch;
}

/* ========== 扫描线（同主页） ========== */
body::after {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 9999;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 2px,
    rgba(0,0,0,0.04) 2px, rgba(0,0,0,0.04) 4px
  );
}

/* ========== 容器 ========== */
.container {
  width: 100%;
  max-width: 960px;
  padding: 2rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

/* ========== 标题 — 终端命令行 ========== */
.header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.prompt { color: var(--green); font-family: var(--font-mono); font-size: var(--sz-md); font-weight: 700; }
.path   { color: var(--cyan); font-family: var(--font-mono); font-size: var(--sz-sm); opacity: 0.7; }
.sep    { color: var(--text-dim); font-family: var(--font-mono); font-size: var(--sz-sm); }

.title {
  font-family: var(--font-display);
  font-size: var(--sz-huge);
  font-weight: 700;
  color: var(--text-hi);
  letter-spacing: -0.01em;
}

.cursor {
  display: inline-block;
  width: 9px; height: 1.3em;
  background: var(--green);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  margin-left: 3px;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

.subtitle {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--text-dim);
  margin-top: 0.2rem;
  letter-spacing: 0.05em;
}

/* ========== 游戏主区域 ========== */
.game-area {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  justify-content: center;
}

/* ========== 棋盘 — 终端窗口框 ========== */
.board-wrapper {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 16px;
  flex-shrink: 0;
  position: relative;
}

.board-wrapper::before {
  content: 'board@aichess';
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.6rem;
  margin: -16px -16px 12px -16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.board-wrapper canvas { display: block; }

/* ========== 信息面板 ========== */
.info-panel {
  flex: 0 0 230px;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

/* 卡片通用 */
.panel-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.3s;
}
.panel-card:hover { border-color: #2a2a2a; }

/* 卡片标题栏 — 深色header+浅色body */
.card-bar {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  padding: 0.45rem 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.card-bar.green  { color: var(--green); }
.card-bar.amber  { color: var(--amber); }
.card-bar.dim    { color: var(--text-dim); }

.card-body { padding: 0.85rem 0.9rem; }

/* ---- 状态 ---- */
.status-card .card-body {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.status-dot {
  width: 9px; height: 9px; flex-shrink: 0;
  background: var(--text-dim);
  transition: background 0.3s;
}
.status-dot.black-turn { background: var(--green); }
.status-dot.white-turn { background: var(--amber); }
.status-dot.game-over  { background: #af5f5f; }

#statusText {
  font-size: var(--sz-sm);
  color: var(--text);
  font-family: var(--font-mono);
}

/* ---- 统计 ---- */
.stats .card-body {
  display: flex;
  justify-content: space-around;
  padding: 0.95rem 0.9rem;
}

.stat-item { text-align: center; }

.stat-label {
  display: block;
  font-size: 0.62rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 3px;
}

.stat-value {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-hi);
  font-family: var(--font-display);
}
.stat-value.black-label { color: var(--green); }
.stat-value.white-label { color: var(--amber); }

/* ========== 按钮 ========== */
.actions { display: flex; gap: 0.6rem; }

.btn {
  flex: 1;
  padding: 0.75rem 0;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: all 0.2s;
  background: transparent;
  color: var(--text);
  text-align: center;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: var(--green);
  color: var(--bg);
  border-color: var(--green);
}
.btn-primary:hover { background: transparent; color: var(--green); }

.btn-secondary { color: var(--text-dim); }
.btn-secondary:hover { border-color: var(--green); color: var(--green); }

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none; }

/* ========== 算法说明 ========== */
.legend .card-body { padding: 0.7rem 0.9rem; }

.legend-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.legend-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.legend-toggle {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
  transition: transform 0.3s;
}
.legend-toggle.open { transform: rotate(180deg); }

.legend-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 0.5rem;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin 0.35s ease;
}
.legend-list.collapsed { max-height: 0; opacity: 0; margin-top: 0; }

.legend-list li {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  padding-left: 0.8rem;
  position: relative;
  line-height: 1.8;
}
.legend-list li::before {
  content: '>';
  position: absolute; left: 0;
  color: var(--green-dim);
  font-family: var(--font-mono);
}

/* ========== 底部 ========== */
.footer-nav {
  text-align: center;
  padding-top: 0.5rem;
}
.footer-nav a {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--border);
  transition: all 0.3s;
  letter-spacing: 0.06em;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.footer-nav a:hover { border-color: var(--green); color: var(--green); }

/* ========== 胜利弹窗 ========== */
.overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.25s ease;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}
.hidden { display: none; }

.win-dialog {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2.5rem 3rem;
  text-align: center;
  animation: scaleIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  max-width: 330px;
  width: 90%;
}
.win-dialog .win-icon {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.6rem;
  letter-spacing: 0.15em;
}
.win-dialog .win-text {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-hi);
  margin-bottom: 0.3rem;
}
.win-dialog .win-sub {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}
.win-dialog .btn { width: 100%; }

@keyframes fadeIn  { from{opacity:0} to{opacity:1} }
@keyframes scaleIn { from{transform:scale(0.9);opacity:0} to{transform:scale(1);opacity:1} }

/* ========== 通用 ========== */
::selection { background: var(--green-dim); color: var(--bg); }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { animation-duration: 0.01ms!important; transition-duration: 0.01ms!important; }
}

/* ============================================================
   响应式 — 平板 ≤780px
   ============================================================ */
@media (max-width: 780px) {
  .container { padding: 1.5rem 1rem 3rem; gap: 1.4rem; }
  .game-area { gap: 1.2rem; }
  .info-panel { flex: 0 0 195px; }
  .title { font-size: 1.7rem; }
}

/* ============================================================
   响应式 — 手机 ≤600px (微信 X5 全覆盖)
   ============================================================ */
@media (max-width: 600px) {
  .container { padding: 0.8rem 0.4rem 4rem; gap: 0.8rem; }

  .header { justify-content: center; padding-bottom: 0.6rem; }
  .title { font-size: 1.3rem; }
  .prompt,.path,.sep { font-size: 0.7rem; }

  .game-area {
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
  }

  /* 棋盘满宽 */
  .board-wrapper {
    width: 100%;
    padding: 8px;
    display: flex;
    justify-content: center;
  }
  .board-wrapper::before {
    margin: -8px -8px 8px -8px;
    font-size: 0.56rem;
    padding: 0.3rem 0.5rem;
  }
  .board-wrapper canvas { max-width: 100%; height: auto; }

  /* 面板全宽 */
  .info-panel { flex: 0 0 auto; width: 100%; flex-direction: column; gap: 0.4rem; }

  .card-bar { font-size: 0.58rem; padding: 0.35rem 0.7rem; }
  .card-body { padding: 0.6rem 0.7rem; }
  .stat-label { font-size: 0.55rem; }
  .stat-value { font-size: 1rem; }

  .actions { gap: 0.5rem; }
  .btn { font-size: 0.74rem; padding: 0.65rem 0; }

  .legend-title { font-size: 0.65rem; }
  .legend-list li { font-size: 0.65rem; }

  .win-dialog { padding: 2rem 1.5rem; max-width: 260px; }
  .win-dialog .win-text { font-size: 1.2rem; }

  .footer-nav a { font-size: 0.65rem; padding: 0.45rem 0.8rem; }
}