.page-faq {
  --faq-rail: 244px;
  --faq-tint: rgba(255, 138, 30, .14);
  --faq-dark-card: rgba(14, 27, 38, .55);
  --faq-hair: rgba(127, 168, 191, .32);
  background: var(--paper);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(34px, 5vw, 54px)) 0 clamp(38px, 6vw, 68px);
  background:
    radial-gradient(880px 380px at 86% -6%, rgba(44, 92, 122, .58), transparent 62%),
    radial-gradient(620px 320px at 8% 110%, rgba(18, 160, 138, .20), transparent 60%),
    linear-gradient(155deg, var(--ink) 0%, var(--steel) 58%, #1b4157 100%);
  color: #fff;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(0deg, rgba(127, 168, 191, .16) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(127, 168, 191, .12) 0 1px, transparent 1px 44px);
  opacity: .6;
}

.page-faq .faq-hero .breadcrumb {
  color: rgba(232, 238, 242, .68);
  font-size: 13px;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-faq .faq-hero .breadcrumb a {
  color: rgba(232, 238, 242, .88);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 30, .5);
  padding-bottom: 1px;
}

.page-faq .faq-hero .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  color: rgba(127, 168, 191, .7);
}

.page-faq .faq-hero .eyebrow {
  color: var(--amber-soft);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: end;
}

.page-faq .faq-hero-main h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin: 14px 0 0;
  max-width: 20em;
}

.page-faq .faq-hero-main .lede {
  margin-top: 18px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(232, 238, 242, .82);
}

.page-faq .faq-hero-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--faq-dark-card);
}

.page-faq .faq-stat-value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--amber);
  line-height: 1;
}

.page-faq .faq-stat-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(232, 238, 242, .74);
}

/* ---------- 通用章节 ---------- */
.page-faq .section {
  padding: clamp(44px, 6vw, 76px) 0;
}

.page-faq .section-head {
  max-width: 68ch;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-faq .section-sub {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .section-sub a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 五类入口 ---------- */
.page-faq .faq-routes {
  background: var(--grey);
}

.page-faq .cat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .cat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px 24px;
  background: var(--paper);
  color: inherit;
  text-decoration: none;
  transition: background 180ms ease;
}

.page-faq .cat-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--mist);
  transition: background 180ms ease;
}

.page-faq .cat-card:hover {
  background: #fff;
}

.page-faq .cat-card:hover::before {
  background: var(--amber);
}

.page-faq .cat-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-faq .cat-name {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .cat-desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  flex: 1 1 auto;
}

.page-faq .cat-go {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--teal-deep);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  background: var(--paper);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-faq .faq-rail-inner {
  border: 1px solid var(--line);
  background: #fff;
  padding: 18px 16px 16px;
}

.page-faq .faq-rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-faq .faq-rail-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  border-left: 3px solid transparent;
  font-size: 14.5px;
  color: var(--text);
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease;
}

.page-faq .faq-rail-link .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link.is-active {
  background: var(--faq-tint);
  border-left-color: var(--amber);
}

.page-faq .faq-rail-link:hover .mono,
.page-faq .faq-rail-link.is-active .mono {
  color: var(--blue);
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .filter-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
  margin-right: 2px;
}

.page-faq .filter-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1;
  padding: 7px 11px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-faq .filter-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.page-faq .filter-btn[aria-pressed="true"] {
  background: var(--steel);
  border-color: var(--steel);
  color: #fff;
}

/* ---------- 问答流 ---------- */
.page-faq .qa-section {
  padding: clamp(30px, 4.6vw, 52px) 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-faq .qa-section + .qa-section {
  margin-top: clamp(8px, 1.6vw, 18px);
}

.page-faq .qa-sec-head {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.page-faq .qa-sec-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--blue);
  margin: 0;
}

.page-faq .qa-sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(21px, 3.1vw, 30px);
  line-height: 1.24;
  color: var(--ink);
}

.page-faq .qa-sec-intro {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--muted);
}

.page-faq .faq-figure {
  margin: 0 0 22px;
}

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

.page-faq .faq-figure .figure-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .acc-item {
  background: #fff;
  border: 1px solid var(--line-soft);
  margin-bottom: 8px;
}

.page-faq .acc-head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  margin: 0;
  padding: 14px 16px;
  border: 0;
  background: var(--steel);
  color: #fff;
  text-align: left;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.55;
  cursor: pointer;
  transition: background 180ms ease;
}

.page-faq .acc-head:hover {
  background: var(--blue);
}

.page-faq .acc-head:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.page-faq .acc-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--amber-soft);
}

.page-faq .acc-title {
  flex: 1 1 auto;
}

.page-faq .acc-icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-faq .acc-icon::before,
.page-faq .acc-icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 220ms ease, opacity 220ms ease;
}

.page-faq .acc-icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .acc-icon::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .acc-head[aria-expanded="true"] .acc-icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .acc-panel {
  border-top: 1px solid var(--line-soft);
  background: var(--paper);
}

.page-faq .acc-body {
  padding: 16px 18px 20px;
  max-width: 68ch;
}

.page-faq .acc-body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .acc-body a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 术语 ---------- */
.page-faq .faq-terms {
  background: var(--grey);
}

.page-faq .term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .term-card {
  display: grid;
  gap: 8px;
  padding: 22px 20px 24px;
  background: #fff;
}

.page-faq .term-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--teal-deep);
}

.page-faq .term-name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .term-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 底部引导条 ---------- */
.page-faq .faq-cta-band {
  position: relative;
  padding: clamp(38px, 6vw, 74px) 0;
  background:
    radial-gradient(720px 300px at 92% 0%, rgba(44, 92, 122, .55), transparent 64%),
    linear-gradient(150deg, var(--ink) 0%, var(--steel) 100%);
  color: #fff;
}

.page-faq .faq-cta-band::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(90px, 16vw, 220px);
  height: 4px;
  background: var(--amber);
}

.page-faq .faq-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-cta-band .eyebrow {
  color: var(--amber-soft);
}

.page-faq .faq-cta-text h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.22;
}

.page-faq .faq-cta-text p {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 238, 242, .82);
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-cta-note {
  margin-top: 14px;
  font-size: 14px;
}

.page-faq .faq-cta-note a {
  color: rgba(232, 238, 242, .86);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-cta-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-cta-contact li {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  background: var(--faq-dark-card);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(232, 238, 242, .88);
}

.page-faq .faq-cta-contact .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--amber-soft);
  word-break: break-word;
}

.page-faq .faq-cta-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: rgba(127, 168, 191, .9);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .cat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

@media (min-width: 1024px) {
  .page-faq .cat-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .cat-card,
  .page-faq .cat-card::before,
  .page-faq .faq-rail-link,
  .page-faq .filter-btn,
  .page-faq .acc-head,
  .page-faq .acc-icon::before,
  .page-faq .acc-icon::after {
    transition: none;
  }
}