.page-faq {
  --faq-rail-w: 240px;
  --faq-term-w: 310px;
  --faq-ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: 40px 0 0;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(23, 39, 74, .78) 0%, rgba(8, 18, 33, 0) 62%),
    linear-gradient(180deg, rgba(14, 26, 51, .6) 0%, rgba(8, 18, 33, 0) 100%);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 30px;
  padding-bottom: 56px;
}

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sand-500);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 34px;
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--sand-300);
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--sand-300);
}

.page-faq .faq-hero__jump {
  margin: 24px 0 0;
  font-size: 14px;
}

.page-faq .faq-hero__jump a {
  color: var(--sand-500);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color .16s linear, border-color .16s linear;
}

.page-faq .faq-hero__jump a:hover,
.page-faq .faq-hero__jump a:focus-visible {
  color: var(--yellow);
  border-color: var(--yellow);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-faq .faq-fact {
  padding: 20px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-fact__key {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-faq .faq-fact__val {
  display: block;
  margin-top: 10px;
  font-size: 19px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--sand-500);
}

/* ---------- 编号速查 ---------- */
.page-faq .faq-lookup {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-lookup__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-faq .faq-lookup__no {
  font-size: 14px;
  color: var(--sand-500);
}

.page-faq .faq-lookup__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: .01em;
  color: var(--sand-300);
}

.page-faq .faq-lookup__lead {
  margin: 0 0 28px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sand-300);
}

.page-faq .faq-lookup__scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-faq .faq-lookup__table {
  min-width: 560px;
  width: 100%;
  font-size: 14px;
}

.page-faq .faq-samples {
  margin-top: 28px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-samples__title {
  margin: 0 0 16px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-samples__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-faq .faq-samples__list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--sand-700);
}

.page-faq .faq-samples__list code {
  font-family: var(--font-index);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--sand-500);
}

.page-faq .faq-samples__list span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 三栏主体 ---------- */
.page-faq .faq-body {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-layout {
  display: grid;
  gap: 44px;
}

/* 左列：索引条 */
.page-faq .faq-rail__figure {
  margin: 0 0 22px;
}

.page-faq .faq-rail__cap {
  margin: 0 0 12px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-left: -1px;
  padding: 12px 12px 12px 14px;
  border-left: 2px solid transparent;
  font-size: 15px;
  color: var(--sand-300);
  text-decoration: none;
  transition: background-color .16s linear, color .16s linear, border-color .16s linear;
}

.page-faq .faq-rail__link .num {
  font-size: 12px;
  color: var(--sand-700);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: var(--ink-900);
  color: var(--paper);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: -2px;
}

.page-faq .faq-layout:has(#g-search[open]) .faq-rail__link[href="#g-search"],
.page-faq .faq-layout:has(#g-scope[open]) .faq-rail__link[href="#g-scope"],
.page-faq .faq-layout:has(#g-fix[open]) .faq-rail__link[href="#g-fix"],
.page-faq .faq-layout:has(#g-contact[open]) .faq-rail__link[href="#g-contact"] {
  border-left-color: var(--yellow);
  background: var(--ink-800);
  color: var(--paper);
}

.page-faq .faq-rail__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* 中列：问答折叠组 */
.page-faq .faq-group {
  padding-top: 32px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.page-faq .faq-group:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  align-items: baseline;
  margin-bottom: 18px;
}

.page-faq .faq-group__no {
  font-size: 20px;
  line-height: 1;
  color: var(--sand-500);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .01em;
  color: var(--sand-300);
}

.page-faq .faq-group__desc {
  grid-column: 2 / -1;
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item:first-of-type {
  border-top: 1px solid var(--line);
}

.page-faq .faq-item > .fold__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
}

.page-faq .faq-item > .fold__head::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__no {
  font-size: 13px;
  line-height: 1.7;
  color: var(--sand-700);
}

.page-faq .faq-item__q {
  font-size: 16px;
  line-height: 1.65;
  color: var(--sand-300);
  transition: color .16s linear;
}

.page-faq .faq-item > .fold__head:hover .faq-item__q {
  color: var(--sand-500);
}

.page-faq .faq-item[open] > .fold__head .faq-item__q {
  color: var(--paper);
}

.page-faq .faq-item > .fold__head:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

.page-faq .faq-item > .fold__body {
  padding: 0 4px 22px 32px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--sand-300);
}

.page-faq .faq-item > .fold__body p {
  margin: 0;
}

.page-faq .faq-groups__figure {
  margin: 44px auto 0;
  max-width: 340px;
}

/* 右列：术语表 */
.page-faq .faq-terms {
  padding: 22px 18px;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-terms__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--sand-300);
}

.page-faq .faq-terms__lead {
  margin: 10px 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-terms__list {
  margin: 0;
}

.page-faq .faq-term {
  padding: 10px 0;
  border-top: 1px dotted var(--line-strong);
}

.page-faq .faq-term__k {
  font-size: 13px;
  font-weight: 600;
  color: var(--sand-500);
}

.page-faq .faq-term__v {
  margin: 4px 0 0;
  font-size: 12px;
  line-height: 1.62;
  color: var(--mist);
}

/* ---------- 收束 ---------- */
.page-faq .faq-close {
  padding: 56px 0 64px;
}

.page-faq .faq-close__inner {
  display: grid;
  gap: 26px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--yellow);
  background: linear-gradient(180deg, rgba(14, 26, 51, .92) 0%, rgba(8, 18, 33, .92) 100%);
}

.page-faq .faq-close__lead h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  letter-spacing: .01em;
  color: var(--sand-300);
}

.page-faq .faq-close__lead p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sand-300);
}

.page-faq .faq-close__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-close__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.page-faq .faq-close__links a {
  font-size: 14px;
  color: var(--sand-500);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color .16s linear, border-color .16s linear;
}

.page-faq .faq-close__links a:hover,
.page-faq .faq-close__links a:focus-visible {
  color: var(--yellow);
  border-color: var(--yellow);
}

/* ---------- 窄屏 ---------- */
@media (max-width: 1023px) {
  .page-faq .faq-rail__figure {
    max-width: 320px;
  }

  .page-faq .faq-rail__list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-left: 0;
  }

  .page-faq .faq-rail__link {
    margin-left: 0;
    padding: 9px 13px;
    border: 1px solid var(--line);
    font-size: 14px;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-color: var(--line-strong);
  }

  .page-faq .faq-layout:has(#g-search[open]) .faq-rail__link[href="#g-search"],
  .page-faq .faq-layout:has(#g-scope[open]) .faq-rail__link[href="#g-scope"],
  .page-faq .faq-layout:has(#g-fix[open]) .faq-rail__link[href="#g-fix"],
  .page-faq .faq-layout:has(#g-contact[open]) .faq-rail__link[href="#g-contact"] {
    border-color: var(--yellow);
  }

  .page-faq .faq-rail__note {
    padding-left: 0;
    border-left: 0;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-top: 52px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    padding-bottom: 72px;
  }

  .page-faq .faq-hero h1 {
    font-size: 50px;
  }

  .page-faq .faq-lookup,
  .page-faq .faq-body {
    padding: 72px 0;
  }

  .page-faq .faq-samples__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-close {
    padding: 72px 0 80px;
  }

  .page-faq .faq-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 40px 34px;
  }

  .page-faq .faq-close__links {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr) var(--faq-term-w);
    gap: 24px;
    align-items: start;
  }

  .page-faq .faq-terms__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 16px;
  }

  .page-faq .faq-term {
    padding: 9px 0;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-item__q,
  .page-faq .faq-hero__jump a,
  .page-faq .faq-close__links a {
    transition: none;
  }
}