.page-faq {
  --faq-rail-w: 264px;
  --faq-gap: 56px;
  background:
    radial-gradient(120% 70% at 88% 0%, rgba(25, 224, 210, .10), transparent 62%),
    radial-gradient(90% 55% at 0% 100%, rgba(245, 197, 66, .06), transparent 58%),
    var(--bg-ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-faq .crumbs {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 22px 0 44px;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -40%;
  width: 46%;
  height: 170%;
  background: linear-gradient(158deg, rgba(25, 224, 210, .15), rgba(25, 224, 210, 0) 68%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34%;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), rgba(245, 197, 66, 0));
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  max-width: 64ch;
  margin: 0 0 26px;
  color: var(--steel);
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 620px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--glass);
  backdrop-filter: blur(6px);
  margin-bottom: 22px;
}

.page-faq .faq-search__mark {
  position: relative;
  flex: none;
  width: 15px;
  height: 15px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
}

.page-faq .faq-search__mark::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 7px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-faq .faq-search__hint {
  flex: 1;
  min-width: 0;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-faq .faq-search__key {
  flex: none;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(245, 197, 66, .16);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.page-faq .faq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-tags .chip {
  text-decoration: none;
  transition: transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-tags .chip:hover,
.page-faq .faq-tags .chip:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-bottom: 72px;
  align-items: start;
}

.page-faq .faq-body {
  order: 1;
  min-width: 0;
}

.page-faq .faq-rail {
  order: 2;
  min-width: 0;
}

/* ---------- 左侧目录 ---------- */
.page-faq .faq-rail__label {
  margin: 0 0 12px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-faq .faq-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line-soft);
}

.page-faq .faq-rail__nav a {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  margin-left: -1px;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-rail__nav a:hover,
.page-faq .faq-rail__nav a:focus-visible {
  color: var(--paper);
  background: var(--glass);
  border-left-color: var(--cyan);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-faq .faq-rail__card {
  margin-top: 24px;
  padding: 18px 18px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--bg-panel);
}

.page-faq .faq-rail__cardtitle {
  margin: 0 0 12px;
  color: var(--paper);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-faq .faq-rail__list a {
  display: block;
  padding-left: 13px;
  position: relative;
  color: var(--steel);
  font-size: 13.5px;
  line-height: 1.55;
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .faq-rail__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--cyan);
  padding-left: 17px;
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: 24px;
}

.page-faq .faq-sec + .faq-sec {
  margin-top: 52px;
  padding-top: 44px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.9vw, 30px);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .faq-sec__lede {
  max-width: 68ch;
  margin: 0 0 20px;
  color: var(--steel);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

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

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

.page-faq .fold__head {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20px;
  align-items: center;
  gap: 16px;
  padding: 17px 2px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
  transition: color .2s var(--ease), padding-left .22s var(--ease);
}

.page-faq .fold__head:hover,
.page-faq .fold__head:focus-visible {
  color: var(--cyan);
  padding-left: 10px;
}

.page-faq .faq-q__text {
  display: block;
  min-width: 0;
}

.page-faq .fold__sign {
  position: relative;
  display: block;
  width: 20px;
  height: 20px;
}

.page-faq .fold__sign::before,
.page-faq .fold__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.page-faq .fold__sign::before {
  width: 14px;
  height: 2px;
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .fold__sign::after {
  width: 2px;
  height: 14px;
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .fold__head[aria-expanded="false"] .fold__sign::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .fold__body {
  max-width: 74ch;
  padding: 0 2px 20px;
  color: var(--steel);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .fold__body[hidden] {
  display: none;
}

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

.page-faq .fold__body p + p {
  margin-top: 10px;
}

.page-faq .fold__body ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .fold__body li {
  position: relative;
  margin-bottom: 8px;
  padding-left: 15px;
}

.page-faq .fold__body li:last-child {
  margin-bottom: 0;
}

.page-faq .fold__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-faq .fold__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 224, 210, .35);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-faq .fold__body a:hover,
.page-faq .fold__body a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 联系方式条 ---------- */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--line-soft);
}

.page-faq .faq-contact__item {
  padding: 18px 20px;
  background: var(--bg-panel);
}

.page-faq .faq-contact__label {
  margin: 0 0 7px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.page-faq .faq-contact__value {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  word-break: break-all;
}

.page-faq .faq-contact .copy-btn {
  margin-top: 12px;
  padding: 7px 14px;
  border: 1px solid var(--cyan);
  border-radius: var(--r-xs);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-contact .copy-btn:hover,
.page-faq .faq-contact .copy-btn:focus-visible,
.page-faq .faq-contact .copy-btn[data-copied] {
  background: var(--cyan);
  color: var(--bg-ink);
}

/* ---------- 目录卡片 ---------- */
.page-faq .faq-cat {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .faq-cat__card {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  grid-template-areas:
    "no name count"
    "no desc desc";
  gap: 4px 14px;
  align-items: baseline;
  padding: 20px 20px 20px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: linear-gradient(135deg, var(--bg-panel), rgba(16, 31, 66, .55));
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease), box-shadow .25s var(--ease);
}

.page-faq .faq-cat__card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .25s var(--ease);
}

.page-faq .faq-cat__card:hover,
.page-faq .faq-cat__card:focus-visible {
  border-color: rgba(25, 224, 210, .5);
  transform: translateY(-3px);
  box-shadow: 0 18px 36px -22px rgba(5, 10, 24, .9);
}

.page-faq .faq-cat__card:hover::after,
.page-faq .faq-cat__card:focus-visible::after {
  transform: scaleY(1);
}

.page-faq .faq-cat__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-faq .faq-cat__name {
  grid-area: name;
  color: var(--paper);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq .faq-cat__count {
  grid-area: count;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--glass);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  white-space: nowrap;
}

.page-faq .faq-cat__desc {
  grid-area: desc;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: linear-gradient(140deg, var(--bg-panel), var(--deep));
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 12px 18px 16px;
  color: var(--steel);
  font-size: 13px;
  line-height: 1.65;
}

.page-faq .faq-figure--wide {
  margin-top: 22px;
}

/* ---------- 尾注 ---------- */
.page-faq .faq-tail {
  max-width: 74ch;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  color: var(--steel);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 224, 210, .35);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-tail a:hover,
.page-faq .faq-tail a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-cat {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact__item:last-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding: 30px 0 54px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
  }

  .page-faq .faq-rail {
    order: 1;
    position: sticky;
    top: 26px;
  }

  .page-faq .faq-body {
    order: 2;
  }

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

  .page-faq .faq-contact__item:last-child {
    grid-column: auto;
  }

  .page-faq .faq-figure {
    margin-top: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-tags .chip,
  .page-faq .faq-cat__card,
  .page-faq .faq-cat__card::after,
  .page-faq .fold__head,
  .page-faq .fold__sign::before,
  .page-faq .fold__sign::after {
    transition: none;
  }

  .page-faq .faq-tags .chip:hover,
  .page-faq .faq-cat__card:hover {
    transform: none;
  }
}