.page-faq {
  --faq-rail-w: 212px;
  --faq-shadow: 0 22px 48px -32px rgba(53, 242, 225, 0.45);
  background: var(--c-void);
  color: var(--c-white);
}

.page-faq [id] {
  scroll-margin-top: 82px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 86% at 96% 4%, rgba(138, 92, 255, 0.2), transparent 58%),
    radial-gradient(86% 74% at 0% 100%, rgba(53, 242, 225, 0.13), transparent 62%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.28;
  mask-image: linear-gradient(to bottom, #000 10%, transparent 82%);
  -webkit-mask-image: linear-gradient(to bottom, #000 10%, transparent 82%);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 52px);
  line-height: 1.22;
  letter-spacing: 0.05em;
  text-shadow: 0 0 26px rgba(53, 242, 225, 0.18);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 40em;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-hero__stat {
  padding: 14px 12px;
  background: rgba(5, 7, 11, 0.72);
}

.page-faq .faq-hero__stat dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}

.page-faq .faq-hero__stat dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 4vw, 22px);
  font-weight: 700;
  color: var(--c-cyan);
  line-height: 1.2;
}

.page-faq .faq-hero__stat dd small {
  margin-left: 3px;
  font-size: 11px;
  color: var(--c-mist);
}

.page-faq .faq-hero__stat:last-child dd {
  color: var(--c-violet);
  font-size: clamp(14px, 3.4vw, 17px);
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  box-shadow: var(--faq-shadow);
}

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

/* ---------- 分类快捷入口 ---------- */
.page-faq .faq-cats {
  padding: 40px 0 8px;
}

.page-faq .faq-cats__head {
  margin-bottom: 20px;
}

.page-faq .faq-cats__title {
  margin: 10px 0 0;
  font-family: var(--font-grotesk);
  font-size: clamp(20px, 4.6vw, 27px);
  letter-spacing: 0.05em;
  line-height: 1.35;
}

.page-faq .faq-cats__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-cat {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num meta";
  align-items: center;
  gap: 2px 14px;
  padding: 16px 16px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--c-cyan);
  background: var(--c-ink);
  color: inherit;
  text-decoration: none;
  transition: border-color 220ms var(--ease), background 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  border-color: var(--line-strong);
  border-left-color: var(--c-cyan);
  background: var(--c-graphite);
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-cat__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-cyan);
  letter-spacing: -0.02em;
}

.page-faq li:nth-child(2) .faq-cat,
.page-faq li:nth-child(5) .faq-cat {
  border-left-color: var(--c-violet);
}

.page-faq li:nth-child(2) .faq-cat__num,
.page-faq li:nth-child(5) .faq-cat__num {
  color: var(--c-violet);
}

.page-faq li:nth-child(4) .faq-cat {
  border-left-color: var(--c-orange);
}

.page-faq li:nth-child(4) .faq-cat__num {
  color: var(--c-orange);
}

.page-faq .faq-cat__name {
  grid-area: name;
  font-family: var(--font-grotesk);
  font-size: 15px;
  letter-spacing: 0.04em;
}

.page-faq .faq-cat__meta {
  grid-area: meta;
  font-size: 12px;
  color: var(--c-mist);
}

/* ---------- 主区：粘性轨道 + 问答流 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 26px;
  padding-top: 36px;
  padding-bottom: 56px;
  align-items: start;
}

.page-faq .faq-rail {
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: rgba(11, 16, 23, 0.86);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-mist);
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__list a {
  font-size: 13px;
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-faq .faq-stream {
  display: grid;
  gap: 38px;
  min-width: 0;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -0.04em;
}

.page-faq .faq-group:nth-of-type(2) .faq-group__num {
  color: var(--c-violet);
}

.page-faq .faq-group:nth-of-type(3) .faq-group__num {
  color: var(--c-orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.8vw, 28px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.3;
}

.page-faq .faq-group__lede {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--c-mist);
  line-height: 1.7;
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .faq-figure {
  margin: 18px 0 0;
  border: 1px solid var(--line);
}

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

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--line);
  border-left: 2px solid transparent;
  background: var(--c-ink);
  transition: border-color 220ms var(--ease), background 220ms var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--line-strong);
}

.page-faq .faq-item[open] {
  border-left-color: var(--c-cyan);
  background: var(--c-graphite);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-grotesk);
  font-size: 14.5px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

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

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

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--c-cyan);
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: -3px;
}

.page-faq .faq-item__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-violet);
  letter-spacing: 0.02em;
}

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

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

.page-faq .faq-item__a p {
  margin: 0;
  padding-top: 13px;
  border-top: 1px dashed var(--line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-faq .faq-item__a a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover {
  color: var(--c-white);
}

/* ---------- 客服块 ---------- */
.page-faq .faq-contact {
  padding: 24px 18px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(148deg, rgba(138, 92, 255, 0.18), rgba(53, 242, 225, 0.07) 62%, rgba(5, 7, 11, 0.4));
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-contact__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.8vw, 28px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.34;
}

.page-faq .faq-contact__lede {
  margin: 12px 0 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-faq .faq-contact__list {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
}

.page-faq .faq-contact__item {
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: rgba(5, 7, 11, 0.55);
}

.page-faq .faq-contact__item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-faq .faq-contact__item dd {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-faq .faq-contact__copy[data-copied] {
  color: var(--c-void);
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 1px var(--c-cyan), 0 0 22px -4px rgba(53, 242, 225, 0.7);
}

.page-faq .faq-more {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.9;
  color: var(--c-mist);
}

.page-faq .faq-more a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  margin: 0 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-hero {
    padding: 40px 0 56px;
  }

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

  .page-faq .faq-cats__list li:first-child {
    grid-column: 1 / -1;
  }

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

  .page-faq .faq-rail__list {
    gap: 10px 22px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
    gap: 48px;
  }

  .page-faq .faq-hero__lede {
    font-size: 16px;
  }

  .page-faq .faq-cats {
    padding: 56px 0 12px;
  }

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

  .page-faq .faq-cats__list li:first-child {
    grid-column: auto;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 52px;
    padding-top: 48px;
    padding-bottom: 76px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 24px;
    padding: 18px 20px;
    border-left: 2px solid var(--c-cyan);
  }

  .page-faq .faq-rail__list {
    display: grid;
    gap: 12px;
  }

  .page-faq .faq-stream {
    gap: 46px;
  }

  .page-faq .faq-stream {
    display: grid;
  }

  .page-faq .faq-contact {
    padding: 32px 30px;
  }

  .page-faq .faq-contact__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-cats__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .faq-cat {
    grid-template-columns: 1fr;
    grid-template-areas:
      "num"
      "name"
      "meta";
    align-items: start;
    gap: 8px;
    padding: 18px 16px;
  }

  .page-faq .faq-item summary {
    padding: 17px 20px;
    font-size: 15.5px;
  }

  .page-faq .faq-item__a {
    padding: 0 20px 18px;
  }
}

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