/* ===== 中国象棋 - 统一样式系统 ===== */

/* 基础重置 */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}

/* 色彩系统 */
:root{
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255,255,255,0.05);
  --bg-hover: rgba(255,255,255,0.08);
  --primary: #e94560;
  --primary-dark: #c23a51;
  --secondary: #16213e;
  --accent: #ffc107;
  --success: #07c160;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #6c757d;
  --border: rgba(255,255,255,0.1);
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
}

/* 基础样式 */
body{
  background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  min-height:100vh;
  color:var(--text-primary);
  line-height:1.6;
}

/* 应用容器 */
.app{
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

/* ===== 头部 ===== */
.header{
  text-align:center;
  padding:30px 20px 20px;
}

.header h1{
  font-size:32px;
  font-weight:700;
  background:linear-gradient(135deg,var(--primary),#ff6b6b);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  margin-bottom:8px;
}

.subtitle{
  color:var(--text-secondary);
  font-size:14px;
}

/* ===== 主内容区 ===== */
.main{
  flex:1;
  padding:20px;
  max-width:600px;
  margin:0 auto;
  width:100%;
}

/* ===== 卡片 ===== */
.card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:16px;
  padding:20px;
  margin-bottom:20px;
  backdrop-filter:blur(10px);
}

/* ===== 按钮 ===== */
.btn{
  display:flex;
  align-items:center;
  gap:15px;
  width:100%;
  padding:18px;
  margin:10px 0;
  border-radius:12px;
  text-decoration:none;
  transition:all 0.2s ease;
  border:none;
  cursor:pointer;
  text-align:left;
}

.btn:active{transform:scale(0.98)}

.btn-icon{
  font-size:28px;
  width:45px;
  height:45px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(255,255,255,0.1);
  border-radius:10px;
  flex-shrink:0;
}

.btn-content{flex:1}

.btn-content strong{
  display:block;
  font-size:16px;
  font-weight:600;
  margin-bottom:4px;
}

.btn-content .desc{
  display:block;
  font-size:13px;
  color:var(--text-secondary);
}

.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:var(--text-primary);
  box-shadow:0 4px 15px rgba(233,69,96,0.3);
}

.btn-primary:hover{
  box-shadow:0 6px 20px rgba(233,69,96,0.4);
}

.btn-secondary{
  background:var(--bg-hover);
  color:var(--text-primary);
  border:1px solid var(--border);
}

.btn-secondary:hover{
  background:rgba(255,255,255,0.1);
}

/* ===== 功能特性 ===== */
.features{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:15px;
  margin-top:25px;
}

.feature-item{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  padding:15px 10px;
  background:var(--bg-card);
  border-radius:12px;
  border:1px solid var(--border);
}

.feature-icon{
  font-size:24px;
  margin-bottom:8px;
}

.feature-item span:last-child{
  font-size:12px;
  color:var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer{
  text-align:center;
  padding:20px;
  color:var(--text-muted);
  font-size:12px;
  border-top:1px solid var(--border);
}

/* ===== 返回按钮 ===== */
.back-btn{
  position:fixed;
  top:15px;
  left:15px;
  width:45px;
  height:45px;
  background:rgba(0,0,0,0.6);
  backdrop-filter:blur(10px);
  border:none;
  border-radius:50%;
  color:var(--text-primary);
  font-size:20px;
  cursor:pointer;
  z-index:100;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:all 0.2s;
}

.back-btn:active{transform:scale(0.9);background:rgba(0,0,0,0.8)}

/* ===== 游戏页面通用 ===== */
.game-info{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin:15px 0;
  padding:15px;
  background:rgba(0,0,0,0.3);
  border-radius:12px;
}

.player{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 15px;
  border-radius:10px;
  transition:all 0.2s;
}

.player.active{
  background:rgba(233,69,96,0.2);
  border:2px solid var(--primary);
}

.player-avatar{font-size:28px}
.player-name{font-size:13px;font-weight:600}

.game-status{
  text-align:center;
  font-size:14px;
  color:var(--primary);
  font-weight:600;
}

/* ===== 棋盘 ===== */
.board-container{
  width:100%;
  background:linear-gradient(135deg,#f5deb3,#e6c89c);
  border-radius:12px;
  padding:15px;
  border:3px solid #8b6914;
  box-shadow:var(--shadow);
}

canvas{
  width:100%;
  height:auto;
  display:block;
  cursor:pointer;
}

/* ===== 控制按钮 ===== */
.controls{
  display:flex;
  gap:10px;
  margin-top:20px;
}

.controls button{
  flex:1;
  padding:14px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:var(--text-primary);
  border:none;
  border-radius:10px;
  font-size:14px;
  font-weight:600;
  cursor:pointer;
  transition:all 0.2s;
}

.controls button:active{transform:scale(0.96)}
.controls button.secondary{background:rgba(255,255,255,0.1)}

/* ===== 描述文本 ===== */
.description{
  background:rgba(255,255,255,0.05);
  padding:20px;
  border-radius:12px;
  margin:15px 0;
  font-size:14px;
  line-height:1.8;
  color:var(--text-secondary);
  border-left:4px solid var(--primary);
}

/* ===== 标签 ===== */
.tags{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-top:10px;
}

.tag{
  padding:4px 10px;
  border-radius:6px;
  font-size:11px;
  font-weight:600;
}

.tag-lian{background:var(--primary)}
.tag-shi{background:var(--success)}
.tag-jiang{background:var(--accent);color:#000}

/* ===== 弹窗 ===== */
.modal{
  position:fixed;
  top:0;left:0;right:0;bottom:0;
  background:rgba(0,0,0,0.8);
  display:none;
  justify-content:center;
  align-items:center;
  z-index:1000;
  padding:20px;
}

.modal.show{display:flex}

.modal-content{
  background:linear-gradient(135deg,var(--bg-secondary),var(--bg-primary));
  padding:30px;
  border-radius:16px;
  max-width:400px;
  width:100%;
  text-align:center;
  border:1px solid var(--border);
}

.modal-title{
  font-size:22px;
  color:var(--primary);
  margin-bottom:15px;
}

.modal-text{
  color:var(--text-secondary);
  margin:20px 0;
  line-height:1.8;
}

/* ===== 响应式 ===== */
@media (max-width:480px){
  .header h1{font-size:28px}
  .btn{padding:15px}
  .btn-icon{width:40px;height:40px;font-size:24px}
  .features{grid-template-columns:repeat(2,1fr)}
  .feature-item{padding:12px 8px}
}

/* ===== 动画 ===== */
@keyframes fadeIn{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}

.card{animation:fadeIn 0.4s ease}
.btn{animation:fadeIn 0.4s ease backwards}
.btn:nth-child(1){animation-delay:0.05s}
.btn:nth-child(2){animation-delay:0.1s}
.btn:nth-child(3){animation-delay:0.15s}
.btn:nth-child(4){animation-delay:0.2s}
.btn:nth-child(5){animation-delay:0.25s}
.btn:nth-child(6){animation-delay:0.3s}
.btn:nth-child(7){animation-delay:0.35s}