.page-faq {
  --faq-line: rgba(185, 200, 193, 0.18);
  --faq-line-soft: rgba(185, 200, 193, 0.09);
  --faq-signal: rgba(0, 240, 200, 0.28);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
  padding-bottom: 64px;
}

.page-faq .wrap {
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 6px;
  border-bottom: 1px solid var(--faq-line);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(0, 240, 200, 0.1), transparent 60%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 122, 47, 0.08), transparent 58%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 82%);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 28px;
  padding-block: 26px 40px;
}

.page-faq .faq-hero__intro h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(40px, 9.5vw, 82px);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-faq .faq-hero .lead {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-faq .faq-hero__hot {
  padding: 18px 0 4px;
  border-top: 2px solid var(--orange);
}

.page-faq .faq-hero__hotlabel {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--faint);
  text-transform: uppercase;
}

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

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

.page-faq .faq-hot a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 16px 4px;
  text-decoration: none;
  color: var(--paper);
  transition: color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-faq .faq-hot a:hover,
.page-faq .faq-hot a:focus-visible {
  color: var(--cyan);
  background: rgba(0, 240, 200, 0.06);
}

.page-faq .faq-hot__idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .faq-hot__q {
  font-family: var(--font-display);
  font-size: clamp(18px, 4.6vw, 24px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.005em;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 0;
  padding-top: 0;
}

.page-faq .faq-rail {
  padding: 20px 0 8px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--faint);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  scrollbar-width: thin;
}

.page-faq .faq-rail__nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 12px;
  font-size: 13.5px;
  line-height: 1.2;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail__nav a .mono {
  font-size: 11px;
  color: var(--faint);
}

.page-faq .faq-rail__nav a:hover {
  color: var(--cyan);
  border-color: var(--faq-signal);
}

.page-faq .faq-rail__nav a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-faq .faq-rail__nav a[aria-current="true"] .mono {
  color: var(--pine);
}

.page-faq .faq-rail__help {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-rail__helptitle {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .faq-rail__helptext {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--faint);
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  padding: 38px 0 30px;
  border-bottom: 1px solid var(--faq-line-soft);
  scroll-margin-top: 88px;
}

.page-faq .faq-section:last-child {
  border-bottom: 0;
}

.page-faq .faq-section__head {
  margin-bottom: 24px;
}

.page-faq .faq-section__no {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-faq .faq-section__no::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--faq-line);
}

.page-faq .faq-section h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.4vw, 40px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-faq .faq-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 26px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--faint);
}

/* ---------- 问答 ---------- */
.page-faq .faq-qa {
  border-top: 1px solid var(--faq-line);
}

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

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item > summary:hover {
  color: var(--cyan);
}

.page-faq .faq-item[open] > summary {
  color: var(--cyan);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 4px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
}

.page-faq .faq-item__sign::before {
  top: 6px;
  left: 0;
  right: 0;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  transition: transform 0.28s var(--ease);
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: scaleY(0);
}

.page-faq .faq-item__body {
  padding: 0 0 18px;
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-faq .faq-item__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 联系渠道 ---------- */
.page-faq .faq-channels {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-channel {
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.page-faq .faq-channel--warm {
  border-left-color: var(--orange);
}

.page-faq .faq-channel__key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--faint);
  text-transform: uppercase;
}

.page-faq .faq-channel__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-tail {
  margin: 28px 0 0;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
  background: var(--panel);
  border-left: 2px solid var(--lime);
}

.page-faq .faq-tail a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

  .page-faq .faq-section {
    padding: 46px 0 36px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(290px, 0.88fr);
    gap: 52px;
    align-items: start;
    padding-block: 40px 56px;
  }

  .page-faq .faq-hero__hot {
    padding-top: 22px;
  }

  .page-faq .faq-item > summary {
    font-size: 19px;
    padding: 18px 0;
  }

  .page-faq .faq-item__body p {
    font-size: 15.5px;
  }

  .page-faq .faq-figure--narrow {
    max-width: 640px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 36px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    padding: 0;
    border-bottom: 0;
  }

  .page-faq .faq-rail__label {
    margin-bottom: 14px;
  }

  .page-faq .faq-rail__nav {
    display: grid;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__nav a {
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--faq-line-soft);
    border-radius: 0;
    white-space: normal;
    font-size: 14px;
    line-height: 1.5;
  }

  .page-faq .faq-rail__nav a:hover {
    border-left-color: var(--faq-signal);
  }

  .page-faq .faq-rail__nav a[aria-current="true"] {
    background: transparent;
    color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-faq .faq-rail__nav a[aria-current="true"] .mono {
    color: var(--orange);
  }

  .page-faq .faq-rail__help {
    margin-top: 26px;
  }

  .page-faq .faq-section {
    padding-top: 8px;
  }

  .page-faq .faq-section + .faq-section {
    padding-top: 52px;
    margin-top: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hot a,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-item > summary,
  .page-faq .faq-rail__nav a {
    transition: none;
  }
}