.page-faq {
  --faq-rail-w: 252px;
  --faq-band-line: rgba(0, 230, 184, .28);
}

/* ---------- 面包屑留白 ---------- */
.page-faq .crumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 6px 0 46px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 80% at 100% 0%, rgba(0, 230, 184, .09), transparent 58%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 75, 43, .06), transparent 62%);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 30px;
  align-items: center;
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 48px;
  }
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.05;
  letter-spacing: -.02em;
}

.page-faq .faq-hero .lead {
  margin: 20px 0 0;
  max-width: 56ch;
  color: var(--silver);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 36px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__stats .metric {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 78px;
}

.page-faq .faq-hero__stats .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-faq .faq-hero__stats .metric__label {
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-faq .faq-hero__media::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--cyan);
  z-index: 2;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.7) brightness(.86);
}

/* ---------- 四类索引 ---------- */
.page-faq .faq-index {
  padding-top: 46px;
}

.page-faq .faq-index .section__head {
  margin-bottom: 22px;
}

.page-faq .faq-cats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

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

@media (min-width: 1060px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-faq .faq-cat {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 18px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--white);
  text-decoration: none;
  transition: border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}

.page-faq .faq-cat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 22px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  border-color: rgba(0, 230, 184, .5);
  background: var(--panel-2);
  transform: translateY(-3px);
}

.page-faq .faq-cat__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-faq .faq-cat__name {
  display: block;
  margin-top: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.3;
}

.page-faq .faq-cat__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-cat__go {
  display: block;
  margin-top: auto;
  padding-top: 16px;
  font-size: 13px;
  color: var(--cyan-soft);
}

/* ---------- 归档说明带 ---------- */
.page-faq .faq-archive {
  position: relative;
  margin-top: 20px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.page-faq .faq-archive__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .15;
  filter: grayscale(1) brightness(.7) contrast(1.1);
  pointer-events: none;
}

.page-faq .faq-archive__body {
  position: relative;
  max-width: 720px;
  padding: 24px 20px;
}

.page-faq .faq-archive__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-archive__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 230, 184, .4);
}

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

/* ---------- 左索引 + 右问答 ---------- */
.page-faq .faq-board {
  padding-top: 50px;
}

.page-faq .faq-board__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

@media (min-width: 1024px) {
  .page-faq .faq-board__inner {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 44px;
  }
}

.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 16px;
}

@media (min-width: 1024px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 4px;
}

.page-faq .faq-rail__nav a {
  flex: 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-faq .faq-rail__nav a:hover {
  color: var(--white);
  background: rgba(255, 255, 255, .03);
}

.page-faq .faq-rail__nav a.is-current {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-dim);
}

@media (min-width: 1024px) {
  .page-faq .faq-rail__nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__nav a {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 9px 12px;
  }

  .page-faq .faq-rail__nav a.is-current {
    border-left-color: var(--cyan);
  }

  .page-faq .faq-rail__nav a:hover {
    background: rgba(255, 255, 255, .025);
  }
}

.page-faq .faq-rail .note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-rail .note a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 247, 216, .35);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: 46px;
}

.page-faq .faq-group__band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 11px 0 12px;
  margin-bottom: 16px;
  border-top: 2px solid var(--cyan);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group--account .faq-group__band {
  border-top-color: var(--amber);
}

.page-faq .faq-group--usage .faq-group__band {
  border-top-color: var(--cyan-soft);
}

.page-faq .faq-group--api .faq-group__band {
  border-top-color: var(--orange);
}

.page-faq .faq-group--help .faq-group__band {
  border-top-color: var(--silver);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -.01em;
  line-height: 1.25;
}

.page-faq .faq-group__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: var(--panel);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-faq .qa + .qa {
  margin-top: 8px;
}

.page-faq .qa summary {
  position: relative;
  display: block;
  padding: 15px 48px 15px 16px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
  cursor: pointer;
  list-style: none;
  transition: color .2s var(--ease);
}

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa summary:hover {
  color: var(--cyan-soft);
}

.page-faq .qa[open] {
  border-color: rgba(0, 230, 184, .42);
  border-left-color: var(--cyan);
  background: var(--panel-2);
}

.page-faq .qa[open] summary::after {
  content: "−";
}

.page-faq .qa__body {
  padding: 0 16px 16px;
}

.page-faq .qa__body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

.page-faq .qa__body p.note {
  margin-top: 10px;
  padding-top: 0;
  border-top: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--muted);
}

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 230, 184, .4);
}

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

/* ---------- 人工渠道 ---------- */
.page-faq .faq-help {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 20px;
}

.page-faq .faq-help > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
  max-width: 62ch;
}

.page-faq .faq-help__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-faq .faq-help__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 28px;
  }
}

.page-faq .faq-help__list li {
  border-left: 2px solid var(--line);
  padding-left: 13px;
}

.page-faq .faq-help__label {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-help__value {
  display: block;
  font-size: 15px;
  color: var(--white);
  word-break: break-word;
}

.page-faq .faq-help .note {
  margin: 20px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

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

/* ---------- 辅助 ---------- */
.page-faq .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-cat,
  .page-faq .qa,
  .page-faq .faq-rail__nav a {
    transition: none;
  }

  .page-faq .faq-cat:hover,
  .page-faq .faq-cat:focus-visible {
    transform: none;
  }
}