/* AA扑克电脑版 —— 深色科技 PC 主题 */

:root {
  --pc-blue: #2563eb;
  --pc-slate: #1e293b;
  --pc-bg: #0b1220;
  --pc-card: #111a2e;
  --pc-border: #1f2b45;
  --pc-text: #cbd5e1;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  background: var(--pc-bg);
  color: var(--pc-text);
}

.gradient-text {
  background: linear-gradient(135deg, #3b82f6 0%, #e2e8f0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.bg-grid {
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.07) 1px, transparent 1px);
  background-size: 40px 40px;
}

.nav-blur {
  background: rgba(11, 18, 32, 0.78) !important;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.55);
}

.card-hover {
  background: var(--pc-card);
  border: 1px solid var(--pc-border);
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}
.card-hover:hover {
  transform: translateY(-8px);
  border-color: rgba(59, 130, 246, 0.55);
  box-shadow: 0 24px 52px -14px rgba(37, 99, 235, 0.45);
}

.btn-glow {
  box-shadow: 0 12px 32px -8px rgba(37, 99, 235, 0.7);
  transition: transform .25s ease, box-shadow .25s ease;
}
.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 44px -8px rgba(59, 130, 246, 0.85);
}

.fade-in {
  opacity: 0;
  transform: translateY(26px);
  animation: fadeUp .8s cubic-bezier(.22, .61, .36, 1) forwards;
}
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
.delay-1 { animation-delay: .12s; }
.delay-2 { animation-delay: .24s; }
.delay-3 { animation-delay: .36s; }

.faq-item {
  background: var(--pc-card);
  border: 1px solid var(--pc-border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color .3s ease, box-shadow .3s ease;
}
.faq-item.active {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 14px 36px -12px rgba(37, 99, 235, 0.4);
}
.faq-question {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  font-weight: 600;
  color: #f1f5f9;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .4s ease;
  padding: 0 22px;
  color: #94a3b8;
  line-height: 1.8;
  font-size: 15px;
}
.faq-item.active .faq-answer { max-height: 400px; padding: 0 22px 20px; }
.faq-icon { transition: transform .35s ease; color: #3b82f6; }
.faq-item.active .faq-icon { transform: rotate(180deg); }

.pc-badge {
  position: absolute;
  bottom: -18px;
  left: -10px;
}
@media (min-width: 768px) {
  .pc-badge { bottom: -20px; left: -16px; }
}