:root {
  --brand-1: #4f46e5;
  --brand-2: #10b981;
  --ink: #0f172a;
  --muted: #64748b;
  --card: #ffffff;
  --line: #e2e8f0;
  --page: #f8fafc;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--page);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

/* 渐变文字 */
.gradient-text {
  background: linear-gradient(120deg, #4f46e5 0%, #10b981 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 网格背景 */
.bg-grid {
  background-image:
    linear-gradient(rgba(16, 185, 129, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 185, 129, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* 毛玻璃导航 */
.nav-blur {
  background: rgba(255, 255, 255, 0.86) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
  border-bottom: 1px solid rgba(16, 185, 129, 0.14);
}

/* 卡片 hover */
.card-hover { transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease; }
.card-hover:hover {
  transform: translateY(-8px);
  box-shadow: 0 22px 44px rgba(16, 185, 129, 0.14);
  border-color: rgba(16, 185, 129, 0.45);
}

/* 按钮光晕 */
.btn-glow {
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
  transition: transform .25s ease, box-shadow .25s ease;
}
.btn-glow:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 42px rgba(16, 185, 129, 0.55);
}

/* 入场动画 */
.fade-in { animation: fadeIn 1s ease both; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}

/* FAQ 手风琴 */
.faq-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  margin-bottom: 14px;
  overflow: hidden;
  background: var(--card);
}
.faq-question {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-weight: 600;
  color: var(--ink);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  padding: 0 22px;
  color: var(--muted);
  line-height: 1.85;
}
.faq-item.open .faq-answer { max-height: 320px; padding: 0 22px 20px; }
.faq-icon { transition: transform .3s ease; color: #10b981; }
.faq-item.open .faq-icon { transform: rotate(180deg); }

/* 认证印章 */
.seal {
  width: 74px;
  height: 74px;
  border-radius: 9999px;
  background: linear-gradient(135deg, #4f46e5, #10b981);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 30px;
  box-shadow: 0 10px 26px rgba(16, 185, 129, 0.4);
  animation: sealPulse 2.6s ease-in-out infinite;
}
@keyframes sealPulse {
  0%, 100% { box-shadow: 0 10px 26px rgba(16, 185, 129, 0.4); }
  50% { box-shadow: 0 10px 40px rgba(79, 70, 229, 0.6); }
}

/* 步骤序号 */
.step-num {
  width: 44px;
  height: 44px;
  border-radius: 9999px;
  background: linear-gradient(135deg, #4f46e5, #10b981);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
}

/* 页面标题 */
.page-hero {
  padding-top: 8.5rem;
  padding-bottom: 3.5rem;
  text-align: center;
}