/* ============================================
   我勒个粽 · 端午赛博游乐场
   共享样式 — 小染配色方案
   ============================================ */
:root {
  --color-primary: #D32F2F;
  --color-gold: #FFD700;
  --color-green: #2E7D32;
  --color-white: #FAFAFA;
  --color-dark: #1a1a1a;
  --color-gray: #666;
  --color-light-gray: #e0e0e0;
  --color-bg: var(--color-primary);
  --color-text: var(--color-white);
  --color-text-dark: #333;
  --color-card-bg: var(--color-white);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.7);
  --font-title: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.gradient-title {
  background: linear-gradient(135deg, var(--color-gold), #fff7a0, var(--color-gold));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  letter-spacing: 2px;
}

.btn-arena {
  display: inline-block;
  padding: 14px 40px;
  font-size: 1.2rem;
  font-weight: 700;
  font-family: var(--font-title);
  color: var(--color-gold);
  background: var(--color-primary);
  border: 3px solid var(--color-gold);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-arena:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255, 215, 0, 0.4);
}

.btn-arena:active { transform: scale(0.95); }
.btn-arena--small { padding: 10px 24px; font-size: 0.95rem; }
.btn-arena--green { background: var(--color-green); border-color: var(--color-gold); }
.btn-arena--active { background: var(--color-gold); color: var(--color-primary); border-color: var(--color-gold); }
.btn-arena:disabled { opacity: 0.5; cursor: not-allowed; }

/* 导航栏 */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar__logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-gold);
  text-decoration: none;
}

.nav-bar__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav-bar__links a {
  color: var(--color-white);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav-bar__links a:hover {
  background: rgba(255, 215, 0, 0.2);
  color: var(--color-gold);
}

/* 碎纸片动画 */
.confetti-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
  overflow: hidden;
}
.confetti-piece {
  position: absolute;
  width: 10px;
  height: 10px;
  animation: confettiFall 1.5s ease-out forwards;
}
@keyframes confettiFall {
  0% { opacity: 1; transform: translateY(0) rotate(0deg) scale(1); }
  100% { opacity: 0; transform: translateY(400px) rotate(720deg) scale(0.3); }
}

@media (max-width: 480px) {
  .nav-bar { flex-wrap: wrap; gap: var(--space-sm); }
  .nav-bar__links { gap: var(--space-xs); }
  .nav-bar__links a { font-size: 0.8rem; padding: 4px 8px; }
}