.page-faq {
  --faq-rail-w: 212px;
  --faq-line: rgba(44, 107, 116, .22);
  --faq-line-strong: rgba(143, 182, 188, .5);
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--f-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background: var(--c-deep);
  color: var(--c-paper);
  padding: clamp(1.4rem, 4vw, 2.4rem) 0 clamp(2.2rem, 6vw, 3.6rem);
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  top: 12%;
  width: 46vw;
  max-width: 520px;
  height: 68%;
  background: radial-gradient(circle at 70% 30%, rgba(44, 107, 116, .55), rgba(14, 42, 34, 0) 68%);
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 clamp(1.2rem, 4vw, 2.2rem);
  padding: 0;
  list-style: none;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--c-steel-soft);
}
.page-faq .faq-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: .4rem;
  color: rgba(143, 182, 188, .55);
}
.page-faq .faq-hero .breadcrumb a {
  color: var(--c-steel-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}
.page-faq .faq-hero .eyebrow {
  margin: 0 0 .7rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-amber);
}
.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.2vw, 4rem);
  line-height: 1.02;
  letter-spacing: -.02em;
}
.page-faq .faq-hero .lede {
  max-width: 44ch;
  margin: clamp(1rem, 3vw, 1.5rem) 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 241, 232, .82);
}
.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .9rem;
  margin-top: clamp(1.2rem, 3.5vw, 1.8rem);
}
.page-faq .faq-hero__meta span {
  font-family: var(--f-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--c-steel-soft);
  border-left: 2px solid var(--c-steel);
  padding-left: .55rem;
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.4rem, 4vw, 2.1rem);
}
.page-faq .faq-hero__bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--c-amber) 0 22%, var(--c-steel) 22% 54%, var(--c-deep-2) 54% 100%);
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 4vw, 2.4rem);
  padding-top: clamp(1.6rem, 5vw, 3rem);
  padding-bottom: clamp(2.4rem, 7vw, 4.5rem);
}

/* ---------- 锚点侧栏 ---------- */
.page-faq .faq-rail__title {
  margin: 0 0 .6rem;
  font-family: var(--f-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-steel);
}
.page-faq .faq-rail .toc-rail {
  display: flex;
  gap: .45rem;
  overflow-x: auto;
  padding-bottom: .6rem;
  scrollbar-width: thin;
}
.page-faq .faq-rail .toc-rail a {
  flex: 0 0 auto;
  display: block;
  padding: .38rem .7rem;
  font-size: .8125rem;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--c-deep-2);
  text-decoration: none;
  border: 1px solid var(--faq-line);
  border-radius: 2px;
  background: rgba(229, 223, 208, .5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-faq .faq-rail .toc-rail a:hover {
  border-color: var(--c-amber);
  color: var(--c-deep);
}
.page-faq .faq-rail .toc-rail a.is-active {
  color: var(--c-paper);
  background: var(--c-deep-2);
  border-color: var(--c-deep-2);
  box-shadow: inset 3px 0 0 var(--c-amber);
}

/* ---------- 流式主体 ---------- */
.page-faq .faq-stream {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 6vw, 3.4rem);
}

/* ---------- 先说三条 ---------- */
.page-faq .faq-top3 {
  background: var(--c-paper-2);
  padding: clamp(1.3rem, 4.5vw, 2.2rem);
  border-left: 4px solid var(--c-amber);
}
.page-faq .faq-top3 .section-title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--c-deep);
}
.page-faq .faq-top3__lead {
  margin: .7rem 0 0;
  max-width: 52ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: #3b474a;
}
.page-faq .faq-top3__list {
  list-style: none;
  margin: clamp(1.2rem, 4vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--faq-line);
  border-top: 1px solid var(--faq-line);
}
.page-faq .faq-top3__item {
  background: var(--c-paper-2);
  padding: clamp(1rem, 3.5vw, 1.4rem) 0 0;
}
.page-faq .faq-top3__num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
  margin-bottom: .55rem;
}
.page-faq .faq-top3__item h3 {
  margin: 0 0 .5rem;
  font-family: var(--f-editorial);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--c-deep);
}
.page-faq .faq-top3__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: #3b474a;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group__head {
  max-width: 60ch;
  padding-bottom: clamp(.9rem, 3vw, 1.4rem);
  border-bottom: 2px solid var(--c-deep);
}
.page-faq .faq-group__head .eyebrow {
  margin: 0 0 .5rem;
  font-family: var(--f-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-steel);
}
.page-faq .faq-group__head .section-title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--c-deep);
}
.page-faq .faq-group__lead {
  margin: .8rem 0 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: #3b474a;
}
.page-faq .faq-group__lead a {
  color: var(--c-steel);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-strong);
}
.page-faq .faq-group__lead a:hover {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: clamp(1.2rem, 4vw, 1.8rem) 0 0;
  background: var(--c-paper-2);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.04);
}
.page-faq .faq-figure--tall {
  max-width: 360px;
  margin-left: 0;
}
.page-faq .faq-figure .figure-frame__tag {
  display: block;
  padding: .6rem .8rem;
  font-family: var(--f-mono);
  font-size: .6875rem;
  letter-spacing: .04em;
  color: var(--c-mono);
  background: var(--c-paper-2);
  border-top: 1px solid var(--faq-line);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  margin-top: clamp(1rem, 3vw, 1.5rem);
  border-bottom: 1px solid var(--faq-line);
}
.page-faq .qa {
  border-top: 1px solid var(--faq-line);
}
.page-faq .qa + .qa {
  border-top: 1px solid var(--faq-line);
}
.page-faq .qa > summary {
  position: relative;
  display: block;
  list-style: none;
  cursor: pointer;
  padding: clamp(.9rem, 3vw, 1.15rem) 2.6rem clamp(.9rem, 3vw, 1.15rem) 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-deep);
  transition: color var(--dur) var(--ease);
}
.page-faq .qa > summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa > summary::after {
  content: "";
  position: absolute;
  right: .9rem;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -6px;
  border-right: 2px solid var(--c-steel);
  border-bottom: 2px solid var(--c-steel);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .qa > summary:hover {
  color: var(--c-steel);
}
.page-faq .qa[open] > summary {
  color: var(--c-deep);
}
.page-faq .qa[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: -2px;
  border-color: var(--c-amber);
}
.page-faq .qa__body {
  padding: 0 clamp(1rem, 4vw, 3rem) clamp(1rem, 3.5vw, 1.4rem) 0;
  animation: faq-drop var(--dur) var(--ease);
}
@keyframes faq-drop {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-faq .qa__body p {
  margin: 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: #3b474a;
}
.page-faq .qa__body a {
  color: var(--c-steel);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-strong);
}
.page-faq .qa__body a:hover {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}
.page-faq .qa .mono,
.page-faq .faq-top3 .mono {
  font-family: var(--f-mono);
  font-size: .9em;
  font-weight: 600;
  color: var(--c-mono);
  letter-spacing: .01em;
}

/* ---------- 收口 ---------- */
.page-faq .faq-closing {
  background: var(--c-deep);
  color: var(--c-paper);
  padding: clamp(1.6rem, 5vw, 2.8rem);
  position: relative;
  overflow: hidden;
}
.page-faq .faq-closing::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 2px dashed rgba(143, 182, 188, .35);
  border-radius: 50%;
}
.page-faq .faq-closing__inner {
  position: relative;
  z-index: 1;
  max-width: 58ch;
}
.page-faq .faq-closing__eyebrow {
  margin: 0 0 .6rem;
  font-family: var(--f-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-amber);
}
.page-faq .faq-closing__title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 4.6vw, 2rem);
  line-height: 1.15;
  letter-spacing: -.01em;
}
.page-faq .faq-closing__text {
  margin: .9rem 0 0;
  font-size: .9375rem;
  line-height: 1.9;
  color: rgba(244, 241, 232, .82);
}
.page-faq .faq-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.2rem, 4vw, 1.8rem);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-top3__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
    background: none;
    border-top: none;
  }
  .page-faq .faq-top3__item {
    padding-top: 0;
    border-top: 2px solid var(--c-steel);
    padding-top: 1rem;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 132px;
    align-self: start;
  }
  .page-faq .faq-rail .toc-rail {
    display: block;
    overflow: visible;
    border-left: 2px solid var(--faq-line);
    padding-bottom: 0;
  }
  .page-faq .faq-rail .toc-rail a {
    display: block;
    margin-left: -2px;
    padding: .5rem 0 .5rem .9rem;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    white-space: normal;
    font-size: .875rem;
    color: #55636a;
  }
  .page-faq .faq-rail .toc-rail a:hover {
    color: var(--c-deep);
    border-left-color: var(--c-steel-soft);
  }
  .page-faq .faq-rail .toc-rail a.is-active {
    color: var(--c-deep);
    background: none;
    border-left-color: var(--c-amber);
    box-shadow: none;
    font-weight: 700;
  }
  .page-faq .faq-figure--tall {
    margin-left: 0;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-figure--tall {
    float: right;
    width: 320px;
    margin: 0 0 1.4rem 2rem;
  }
  .page-faq .faq-group--with-float::after {
    content: "";
    display: block;
    clear: both;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body {
    animation: none;
  }
  .page-faq .qa > summary::after,
  .page-faq .faq-rail .toc-rail a {
    transition: none;
  }
}