:root {
  color-scheme: light;
  --brand: #183f9d;
  --brand-dark: #102d72;
  --ink: #171b24;
  --muted: #667085;
  --line: #e2e6ec;
  --surface: #f5f7fa;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: white; font-family: Poppins, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.7; }
a { color: var(--brand-dark); text-underline-offset: 4px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #8ca8ff; outline-offset: 3px; }

.faq-page__header { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 32px; padding: 16px max(24px, calc((100vw - 1120px) / 2)); border-bottom: 1px solid var(--line); }
.faq-page__brand { color: var(--ink); font-weight: 720; text-decoration: none; white-space: nowrap; }
.faq-page__header nav { display: flex; align-items: center; gap: 25px; }
.faq-page__header nav a { color: #3d4655; font-size: 0.88rem; text-decoration: none; }
.faq-page__header nav a:hover, .faq-page__header nav a[aria-current="page"] { color: var(--brand); }

.faq-page__main { width: min(100% - 40px, 1120px); margin: 0 auto; padding: 34px 0 88px; }
.faq-page__breadcrumb { display: flex; gap: 9px; color: var(--muted); font-size: 0.78rem; }
.faq-page__breadcrumb a { color: inherit; }
.faq-page__intro { max-width: 780px; padding: clamp(48px, 8vw, 92px) 0 52px; }
.faq-page__intro > p:first-child { margin: 0 0 12px; color: var(--brand); font-size: 0.78rem; font-weight: 750; letter-spacing: 0.08em; }
.faq-page__intro h1 { margin: 0; font-size: clamp(2.7rem, 7vw, 5.7rem); line-height: 1.03; letter-spacing: -0.05em; }
.faq-page__intro > p:last-child { max-width: 62ch; margin: 22px 0 0; color: #4d5869; font-size: clamp(1rem, 2vw, 1.15rem); }

.faq-page__list { border-top: 1px solid var(--line); }
.faq-page__item { scroll-margin-top: 24px; border-bottom: 1px solid var(--line); }
.faq-page__item summary { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 4px; font-size: clamp(1rem, 2vw, 1.13rem); font-weight: 650; cursor: pointer; list-style: none; }
.faq-page__item summary::-webkit-details-marker { display: none; }
.faq-page__item summary span:last-child { color: var(--brand); font-size: 1.6rem; font-weight: 350; transition: transform 180ms ease; }
.faq-page__item[open] summary span:last-child { transform: rotate(45deg); }
.faq-page__answer { max-width: 820px; padding: 0 48px 28px 4px; color: #4d5869; }
.faq-page__answer > :first-child { margin-top: 0; }
.faq-page__answer > :last-child { margin-bottom: 0; }
.faq-page__answer h2, .faq-page__answer h3 { color: var(--ink); line-height: 1.35; }
.faq-page__answer blockquote { margin: 1.3em 0; padding: 3px 0 3px 18px; border-left: 3px solid var(--brand); }
.faq-page__answer li + li { margin-top: 0.35em; }
.faq-page__empty { padding: 36px 4px; color: var(--muted); }

.faq-page__contact { margin-top: 72px; display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(230px, .7fr); gap: 48px; padding: clamp(30px, 5vw, 54px); color: white; background: var(--brand-dark); }
.faq-page__contact p { margin: 0 0 8px; color: #b9c8f5; font-size: 0.82rem; }
.faq-page__contact h2 { max-width: 680px; margin: 0; font-size: clamp(1.35rem, 3vw, 2.1rem); line-height: 1.35; }
.faq-page__contact > div:last-child { display: grid; align-content: center; gap: 8px; }
.faq-page__contact a { color: white; }
.faq-page__footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px max(20px, calc((100vw - 1120px) / 2)); color: var(--muted); background: var(--surface); border-top: 1px solid var(--line); font-size: 0.78rem; }
.faq-page__footer p { margin: 0; }

@media (max-width: 820px) {
  .faq-page__header { align-items: flex-start; flex-direction: column; gap: 10px; }
  .faq-page__header nav { width: 100%; gap: 18px; overflow-x: auto; padding-bottom: 4px; }
  .faq-page__contact { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 520px) {
  .faq-page__main { width: min(100% - 30px, 1120px); }
  .faq-page__intro { padding-top: 52px; }
  .faq-page__footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}