:root {
  --primary: #7B68EE;
  --primary-dark: #5A4ACF;
  --secondary: #4CAF50;
  --accent: #FFD700;
  --dark: #2D2D2D;
  --light: #F8F9FA;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background-color: #120821;
  color: #f8f9fa;
  overflow-x: hidden;
}

.header-scrolled {
  background: rgba(18, 8, 33, 0.95) !important;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.page-hero-codes {
  position: relative;
  min-height: 52vh;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 15% 30%, rgba(255, 215, 0, 0.12) 0%, transparent 35%),
    radial-gradient(circle at 85% 70%, rgba(123, 104, 238, 0.18) 0%, transparent 35%),
    linear-gradient(150deg, #120821 0%, #1e1038 100%);
  overflow: hidden;
}

.page-hero-codes::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, #120821, transparent);
}

.hero-codes-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.code-card {
  position: relative;
  background: linear-gradient(145deg, rgba(255, 215, 0, 0.08), rgba(123, 104, 238, 0.06));
  border: 1px solid rgba(255, 215, 0, 0.18);
  border-radius: 1.25rem;
  padding: 1.75rem;
  transition: all 0.3s ease;
  overflow: hidden;
}

.code-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg, transparent, rgba(255, 215, 0, 0.15), transparent 30%);
  animation: rotate 6s linear infinite;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.code-card:hover::before {
  opacity: 1;
}

.code-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 24px 48px rgba(255, 215, 0, 0.15);
  border-color: rgba(255, 215, 0, 0.35);
}

.code-card-inner {
  position: relative;
  z-index: 1;
  background: #120821;
  border-radius: 1rem;
}

@keyframes rotate {
  100% { transform: rotate(360deg); }
}

.code-box {
  font-family: "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.1em;
  background: rgba(0, 0, 0, 0.35);
  border: 1px dashed rgba(255, 215, 0, 0.4);
  border-radius: 0.75rem;
  padding: 0.875rem 1.25rem;
  color: var(--accent);
  font-size: 1.125rem;
  font-weight: 700;
}

.copy-code {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.875rem;
  background: linear-gradient(135deg, var(--accent), #ffaa00);
  color: #1a1a2e;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-code:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 16px rgba(255, 215, 0, 0.35);
}

.copy-code.copied {
  background: var(--secondary);
  color: #fff;
}

.welfare-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1.5rem;
  transition: all 0.3s ease;
}

.welfare-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(123, 104, 238, 0.18);
  border-color: rgba(123, 104, 238, 0.25);
}

.welfare-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(123, 104, 238, 0.15));
  color: var(--accent);
}

.section-title-codes {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  position: relative;
  display: inline-block;
}

.section-title-codes::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  border-radius: 2px;
}

.btn-3d {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-weight: 700;
  border-radius: 9999px;
  transition: all 0.3s ease;
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 6px 0 var(--primary-dark), 0 12px 24px rgba(0, 0, 0, 0.35);
}

.btn-3d:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 0 var(--primary-dark), 0 20px 36px rgba(0, 0, 0, 0.4);
}

.qr-img {
  border-radius: 0.75rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}