.page-faq {
  --faq-rail: 15.5rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(2rem, 6vw, 4.25rem) 0 clamp(2.25rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 85% at 84% -10%, rgba(25, 227, 194, 0.11), transparent 60%),
    linear-gradient(142deg, var(--ink-3) 0%, var(--ink-2) 44%, var(--ink) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.28;
  background-image:
    linear-gradient(to right, rgba(31, 77, 64, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 77, 64, 0.55) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -34%;
  z-index: -1;
  width: min(44rem, 78%);
  aspect-ratio: 16 / 9;
  background: linear-gradient(122deg, rgba(212, 175, 55, 0.2), rgba(25, 227, 194, 0.06));
  clip-path: polygon(30% 100%, 100% 4%, 100% 100%);
}

.page-faq .faq-hero__inner {
  position: relative;
}

.page-faq .faq-hero__crumbs {
  margin: 0 0 1.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 0.7rem;
}

.page-faq .faq-hero h1 {
  margin: 0 0 1.15rem;
  max-width: 20ch;
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 5.6vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero h1::after {
  content: "";
  display: block;
  width: 4.5rem;
  height: 3px;
  margin-top: 1.15rem;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.96rem, 1.9vw, 1.12rem);
  line-height: 1.85;
  color: var(--paper);
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.9rem;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem clamp(1.25rem, 5vw, 3rem);
  margin: 2.1rem 0 0;
  padding: 1.05rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.page-faq .faq-hero__meta-num {
  margin-right: 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--amber);
}

/* ---------- 主布局 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(2.25rem, 6vw, 4.25rem);
  padding-bottom: var(--step);
}

/* ---------- 左侧分类档案夹 ---------- */

.page-faq .faq-index {
  position: relative;
  padding: 1.15rem 1rem 1.3rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
}

.page-faq .faq-index::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: 0;
  width: 3px;
  height: 1.5rem;
  background: var(--gold);
}

.page-faq .faq-index__title {
  margin: 0 0 0.85rem;
  padding-left: 0.85rem;
  font-family: var(--font-head);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq .faq-chips::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-chips .chip {
  flex: 0 0 auto;
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-chips .chip:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-faq .faq-chips .chip:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-chips .chip[aria-pressed="true"] {
  color: var(--paper);
  border-color: var(--gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.2), rgba(212, 175, 55, 0) 78%);
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-faq .faq-index__note {
  margin: 1.15rem 0 0;
}

/* ---------- 问答分组 ---------- */

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

.page-faq .faq-group {
  margin-bottom: clamp(2.25rem, 5vw, 3.5rem);
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 1.05rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.12rem, 2.6vw, 1.55rem);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-figure {
  margin: 0 0 1.35rem;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 单条问答 ---------- */

.page-faq .qa {
  border-bottom: 1px solid rgba(31, 77, 64, 0.75);
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.8rem;
  padding: 0.95rem 0.2rem;
  list-style: none;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--paper);
  transition: color 0.24s var(--ease);
}

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

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

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

.page-faq .qa summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .qa summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  margin-top: 0.55rem;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-faq .qa[open] summary::after {
  transform: rotate(-135deg);
  border-color: var(--gold);
}

.page-faq .qa__mark {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 1.55rem;
  height: 1.55rem;
  margin-top: 0.18rem;
  border: 1px solid var(--gold);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1;
  color: var(--gold);
  opacity: 0.85;
}

.page-faq .qa__text {
  min-width: 0;
  transition: color 0.24s var(--ease);
}

.page-faq .qa__a {
  padding: 0 0.2rem 1.15rem 2.55rem;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__lead {
  color: var(--paper);
  font-weight: 600;
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 194, 0.4);
}

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

/* ---------- 收口区块 ---------- */

.page-faq .faq-foot {
  position: relative;
  padding: clamp(2.25rem, 6vw, 4rem) 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(112deg, var(--ink-3) 0%, var(--ink-2) 58%, var(--ink) 100%);
}

.page-faq .faq-foot__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}

.page-faq .faq-foot__copy .eyebrow {
  margin: 0 0 0.6rem;
}

.page-faq .faq-foot__copy h2 {
  margin: 0 0 0.85rem;
  max-width: 24ch;
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3.6vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-foot__copy p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-foot__ways {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-foot__ways li {
  padding: 0.7rem 0 0.7rem 0.95rem;
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.08), transparent 72%);
}

.page-faq .faq-foot__label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-foot__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 揭示动效 ---------- */

.page-faq [data-reveal] {
  opacity: 1;
}

.js .page-faq [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

.js .page-faq [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity 0.62s var(--ease), transform 0.62s var(--ease);
}

/* ---------- 窄屏 ---------- */

@media (max-width: 39.99rem) {
  .page-faq .faq-hero h1 {
    max-width: none;
  }

  .page-faq .faq-hero__quick .btn {
    flex: 1 1 auto;
    text-align: center;
  }

  .page-faq .qa__a {
    padding-left: 2.3rem;
  }

  .page-faq .qa summary {
    font-size: 0.96rem;
    gap: 0.65rem;
  }
}

/* ---------- 桌面端 ---------- */

@media (min-width: 62rem) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 6.5rem;
    padding: 1.3rem 1.15rem 1.45rem;
  }

  .page-faq .faq-chips {
    flex-wrap: wrap;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-chips .chip {
    flex: 1 1 calc(50% - 0.25rem);
    text-align: left;
  }

  .page-faq .faq-foot__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 22rem);
    align-items: end;
    gap: 3.5rem;
  }

  .page-faq .faq-figure {
    margin-bottom: 1.6rem;
  }
}

@media (min-width: 82rem) {
  .page-faq .faq-layout {
    grid-template-columns: 17rem minmax(0, 1fr);
    column-gap: 4.5rem;
  }

  .page-faq .faq-chips .chip {
    flex: 0 0 auto;
  }
}

/* ---------- 减弱动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal],
  .js .page-faq [data-reveal],
  .js .page-faq [data-reveal].is-revealed {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .page-faq .qa summary::after,
  .page-faq .qa__text,
  .page-faq .faq-chips .chip {
    transition: none !important;
  }
}