.page-faq {
  --faq-line: rgba(42, 61, 92, .72);
  --faq-line-soft: rgba(42, 61, 92, .45);
  --faq-surface: rgba(19, 28, 43, .58);
  --faq-surface-open: rgba(19, 28, 43, .94);
  --faq-index-w: 15.5rem;
  position: relative;
  isolation: isolate;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  overflow-x: clip;
  color: var(--text);
}

.page-faq .faq-breadcrumb-row {
  padding-top: clamp(1.25rem, 4vw, 2.5rem);
  padding-bottom: .5rem;
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.25rem, 4vw, 2.25rem) 0 clamp(2.25rem, 6vw, 4rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% 0 -10%;
  background:
    radial-gradient(1100px 400px at 10% -8%, rgba(31, 111, 235, .24), transparent 66%),
    radial-gradient(680px 320px at 94% 8%, rgba(184, 107, 75, .16), transparent 72%);
  pointer-events: none;
  z-index: -1;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
  min-width: 0;
}

.page-faq .faq-hero-copy {
  min-width: 0;
}

.page-faq .faq-hero h1 {
  margin: .55rem 0 1rem;
  font-size: clamp(1.85rem, 4.6vw, 3.05rem);
  line-height: 1.16;
  letter-spacing: -.025em;
  max-width: 15em;
  overflow-wrap: break-word;
}

.page-faq .faq-hero .lead {
  margin: 0 0 1.35rem;
  max-width: 36em;
  font-size: clamp(1rem, 1.5vw, 1.06rem);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--faq-line);
}

.page-faq .faq-quick-label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--text-dim);
  margin-right: .2rem;
}

.page-faq .faq-chip {
  display: inline-block;
  padding: .34rem .78rem;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  background: rgba(31, 111, 235, .09);
  color: var(--blue-400);
  font-size: .82rem;
  line-height: 1.3;
  text-decoration: none;
  transition: background .2s var(--ease), border-color .2s var(--ease),
              color .2s var(--ease), transform .2s var(--ease);
}

.page-faq .faq-chip:hover {
  background: rgba(31, 111, 235, .22);
  border-color: var(--blue-400);
  color: var(--text);
  transform: translateY(-1px);
}

.page-faq .faq-hero-figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(76, 154, 255, .3);
  pointer-events: none;
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
  min-width: 0;
}

.page-faq .faq-flow {
  min-width: 0;
}

/* ---------- 侧边索引 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-m);
  padding: 1rem 1rem .9rem;
  background: linear-gradient(168deg, rgba(19, 28, 43, .94), rgba(11, 18, 32, .58));
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-index-title {
  margin: 0 0 .8rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--text-dim);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .18rem;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
}

.page-faq .faq-index-link {
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  align-items: baseline;
  gap: .5rem;
  padding: .5rem .55rem;
  border-left: 2px solid transparent;
  border-radius: var(--radius-s);
  color: var(--text-dim);
  font-size: .9rem;
  line-height: 1.4;
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease),
              border-color .2s var(--ease);
}

.page-faq .faq-index-link:hover {
  color: var(--text);
  background: rgba(31, 111, 235, .13);
  border-left-color: var(--blue-400);
}

.page-faq .faq-index-num {
  font-size: .72rem;
  color: var(--blue-400);
}

.page-faq .faq-index-text {
  min-width: 0;
}

.page-faq .faq-index-readout {
  margin: .9rem 0 0;
  padding-top: .8rem;
  border-top: 1px dashed var(--faq-line-soft);
  font-size: .78rem;
  color: var(--text-dim);
}

.page-faq .faq-index-readout strong {
  color: var(--state);
  font-weight: 600;
}

/* ---------- 问题区块 ---------- */
.page-faq .faq-block {
  scroll-margin-top: 7rem;
  padding: clamp(1.6rem, 3.6vw, 2.5rem) 0;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-block:first-child {
  border-top: 0;
  padding-top: .25rem;
}

.page-faq .faq-block-head {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 1.35rem;
}

.page-faq .faq-block-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: .25rem;
  bottom: .25rem;
  width: 3px;
  border-radius: 99px;
  background: var(--line);
  transition: background .35s var(--ease);
}

.page-faq .faq-block.is-active .faq-block-head::before {
  background: var(--signal);
}

.page-faq .faq-block-num {
  display: block;
  margin-bottom: .4rem;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--blue-400);
  transition: color .35s var(--ease);
}

.page-faq .faq-block.is-active .faq-block-num {
  color: var(--signal);
}

.page-faq .faq-block h2 {
  margin: 0 0 .55rem;
  font-size: clamp(1.32rem, 2.6vw, 1.8rem);
  line-height: 1.26;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-faq .faq-block-desc {
  margin: 0;
  max-width: 52ch;
  font-size: .97rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .faq-inline-figure {
  margin: 0 0 1.4rem;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--faq-line-soft);
  border-radius: var(--radius-m);
  background: var(--faq-surface);
  margin-bottom: .6rem;
  overflow: hidden;
  transition: border-color .25s var(--ease), background .25s var(--ease),
              transform .25s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(76, 154, 255, .45);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-color: rgba(76, 154, 255, .6);
  background: var(--faq-surface-open);
  transform: none;
}

.page-faq .qa-q {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr) 1.15rem;
  align-items: start;
  gap: .7rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-weight: 600;
}

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

.page-faq .qa-q::marker {
  content: "";
}

.page-faq .qa-num {
  font-size: .76rem;
  color: var(--blue-400);
  padding-top: .18rem;
}

.page-faq .qa[open] .qa-num {
  color: var(--signal);
}

.page-faq .qa-text {
  min-width: 0;
  font-size: 1rem;
  line-height: 1.55;
  overflow-wrap: break-word;
}

.page-faq .qa-mark {
  position: relative;
  width: 1.15rem;
  height: 1.15rem;
  margin-top: .2rem;
  flex: none;
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--blue-400);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: transform .28s var(--ease), opacity .2s var(--ease),
              background .25s var(--ease);
}

.page-faq .qa-mark::before {
  width: 12px;
  height: 2px;
}

.page-faq .qa-mark::after {
  width: 2px;
  height: 12px;
}

.page-faq .qa[open] .qa-mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa[open] .qa-mark::before {
  background: var(--signal);
}

.page-faq .qa-a {
  padding: 0 1.1rem 1.15rem;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-faq .qa-a p {
  margin: 0 0 .7rem;
}

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

/* ---------- 人工支持 ---------- */
.page-faq .faq-contact {
  margin-top: 1.6rem;
  padding: 1.15rem 1.15rem 1.05rem;
  border: 1px solid rgba(43, 217, 168, .3);
  border-radius: var(--radius-m);
  background: linear-gradient(152deg, rgba(43, 217, 168, .1), rgba(19, 28, 43, .72) 58%);
}

.page-faq .faq-contact h3 {
  margin: 0 0 .9rem;
  font-size: .95rem;
  letter-spacing: .04em;
  color: var(--state);
}

.page-faq .faq-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-faq .faq-contact-item {
  display: grid;
  grid-template-columns: 5.6rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .6rem;
  padding-bottom: .55rem;
  border-bottom: 1px dashed var(--faq-line-soft);
}

.page-faq .faq-contact-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-contact-key {
  font-size: .8rem;
  color: var(--text-dim);
}

.page-faq .faq-contact-val {
  font-size: .9rem;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact-note {
  margin: .95rem 0 0;
  padding-top: .8rem;
  border-top: 1px dashed var(--faq-line-soft);
  font-size: .84rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (max-width: 40rem) {
  .page-faq .faq-contact-item {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

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

  .page-faq .faq-contact-val {
    grid-column: 1;
  }

  .page-faq .faq-contact-item .copy-btn {
    grid-column: 2;
    grid-row: 2;
  }

  .page-faq .qa-q {
    grid-template-columns: 1.8rem minmax(0, 1fr) 1.1rem;
    gap: .55rem;
    padding: .9rem .9rem;
  }

  .page-faq .qa-a {
    padding: 0 .9rem 1.05rem;
  }
}

@media (min-width: 62rem) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(2rem, 4.5vw, 3.75rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 6.75rem;
    padding: 1.15rem 1.05rem 1rem;
  }

  .page-faq .faq-index-list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 64rem) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-chip,
  .page-faq .qa,
  .page-faq .qa-mark::before,
  .page-faq .qa-mark::after,
  .page-faq .faq-index-link {
    transition: none;
  }

  .page-faq .qa:hover {
    transform: none;
  }
}

@media print {
  .page-faq .faq-index,
  .page-faq .faq-quick {
    display: none;
  }

  .page-faq .qa {
    break-inside: avoid;
    border-color: #999;
  }

  .page-faq .qa-a {
    display: block;
  }
}