:root {
  --primary: #4F46E5;
  --primary-dark: #312E81;
  --grad1: #4F46E5;
  --grad2: #7D3DED;
  --text: #2E2E4F;
  --muted: #7B8498;
  --bg: #F5F6FA;
  --card: #FFFFFF;
  --chip: #EEEDFE;
  --line: #E8EAF2;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 42px;
}
a { color: var(--primary); text-decoration: none; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 920px;
  margin: 0 auto;
  padding: 16px 20px 0;
  font-size: 13px;
  font-weight: 700;
}
.topbar a:first-child::before { content: "‹ "; font-size: 17px; vertical-align: -1px; }
.language { color: var(--muted); }

.hero {
  max-width: 920px;
  margin: 0 auto;
  padding: 36px 20px 26px;
  text-align: center;
}
.logo {
  width: 66px;
  height: 66px;
  margin: 0 auto 14px;
  border-radius: 20px;
  object-fit: contain;
  box-shadow: 0 12px 28px rgba(49,46,129,.2);
}
.hero h1 { font-size: 31px; line-height: 1.2; font-weight: 850; }
.hero p { max-width: 600px; margin: 10px auto 0; color: var(--muted); font-size: 15px; }

.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }
.breadcrumb { margin: 0 0 18px; font-size: 13px; font-weight: 700; }
.breadcrumb a + a { margin-left: 14px; }
.index-note {
  padding: 17px 18px;
  border: 1px solid #E2DDFA;
  border-radius: 15px;
  background: linear-gradient(135deg, #EEF2FF 0%, #F7EFFF 100%);
  color: #555B70;
  font-size: 14px;
}
.index-note strong { color: var(--primary-dark); }
.category-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 12px 0 34px;
}
.category {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 14px;
  color: var(--text);
  box-shadow: 0 3px 12px rgba(40,40,80,.04);
  transition: transform .16s, box-shadow .16s;
}
.category:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(40,40,80,.08); }
.category .icon { font-size: 25px; display: block; margin-bottom: 8px; }
.category strong { display: block; font-size: 14px; line-height: 1.35; }
.category small { display: block; color: var(--muted); font-size: 11.5px; margin-top: 4px; line-height: 1.45; }

.faq-section { scroll-margin-top: 18px; margin-top: 30px; }
.section-title { display: flex; align-items: center; gap: 11px; margin-bottom: 13px; }
.section-title .icon {
  width: 40px; height: 40px; flex: 0 0 40px; display: flex;
  align-items: center; justify-content: center; border-radius: 12px;
  background: var(--chip); font-size: 21px;
}
.section-title h2 { font-size: 19px; line-height: 1.3; font-weight: 820; }
.section-title small { display: block; color: var(--muted); font-size: 12px; font-weight: 500; margin-top: 2px; }

.question {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  margin: 10px 0;
  box-shadow: 0 2px 8px rgba(40,40,80,.035);
  overflow: hidden;
}
.question summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 18px;
  font-size: 15px;
  font-weight: 720;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}
.question summary::-webkit-details-marker { display: none; }
.question summary::after { content: "+"; color: var(--primary); font-size: 21px; font-weight: 500; line-height: 1; }
.question[open] summary::after { content: "−"; }
.answer { padding: 0 18px 17px; color: #50566A; font-size: 14px; }
.answer p + p { margin-top: 8px; }
.answer ul { padding-left: 19px; }
.answer li { margin: 4px 0; }
.answer strong { color: var(--primary-dark); }

.contact-card {
  margin-top: 36px;
  padding: 22px 20px;
  text-align: center;
  border: 1px solid #DFDAF8;
  border-radius: 17px;
  background: linear-gradient(135deg, #EEF2FF 0%, #F6EEFF 100%);
}
.contact-card h2 { font-size: 18px; }
.contact-card p { color: var(--muted); font-size: 14px; margin: 4px 0 10px; }
.contact-card .mail { font-weight: 750; }
.foot { text-align: center; color: var(--muted); font-size: 11.5px; margin-top: 28px; }

@media (max-width: 760px) {
  .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero h1 { font-size: 28px; }
}
@media (max-width: 420px) {
  .hero { padding-top: 28px; }
  .wrap { padding: 0 14px; }
  .topbar { padding-left: 14px; padding-right: 14px; }
  .category-grid { gap: 9px; }
  .category { padding: 13px 12px; }
  .question summary { padding: 15px; }
  .answer { padding: 0 15px 16px; }
}