.page-faq {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 40px;
  background:
    radial-gradient(118% 92% at 90% 4%, rgba(53, 232, 210, .13), transparent 58%),
    radial-gradient(92% 86% at 2% 100%, rgba(123, 91, 255, .16), transparent 64%),
    var(--ink);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(242, 236, 225, .1) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: .5;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb__list {
  color: var(--grey);
  font-size: 12px;
}

.page-faq .faq-hero .breadcrumb__item[aria-current="page"] {
  color: var(--cyan);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-faq .faq-hero .idx {
  margin: 0;
  color: rgba(53, 232, 210, .82);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 11.5vw, 5rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-hero__strong {
  font-weight: 850;
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--dim);
}

.page-faq .faq-hero__aside {
  align-self: end;
}

.page-faq .faq-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-faq .faq-metrics__item {
  display: grid;
  gap: 5px;
  padding: 14px 12px;
  background: var(--ink);
}

.page-faq .faq-metrics__num {
  font-size: clamp(1.5rem, 6.5vw, 2rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .faq-metrics__label {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--grey);
}

/* ============ 主体骨架 ============ */
.page-faq .faq-body {
  padding: 0 0 76px;
  background: var(--ink);
}

.page-faq .faq-body__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

/* ============ 问题索引 ============ */
.page-faq .faq-toc__label {
  margin: 0 0 12px;
  color: var(--grey);
}

.page-faq .faq-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--hair);
  color: var(--dim);
  font-size: 12.5px;
  line-height: 1.45;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-toc__num {
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--paper);
  border-color: var(--hair-strong);
}

.page-faq .faq-toc__link:hover .faq-toc__num,
.page-faq .faq-toc__link:focus-visible .faq-toc__num {
  color: var(--cyan);
}

.page-faq .faq-toc__note {
  margin: 14px 0 0;
  font-size: 11.5px;
  line-height: 1.75;
  letter-spacing: .04em;
  color: var(--grey);
}

/* ============ 答案区 ============ */
.page-faq .faq-answers {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-faq .faq-sec {
  background: var(--paper);
  color: var(--text);
  padding: 24px 20px 26px;
  scroll-margin-top: 92px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-sec:target {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-faq .faq-sec__head {
  display: grid;
  gap: 9px;
  padding-bottom: 18px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--hair-dark);
}

.page-faq .faq-sec__head .idx {
  margin: 0;
  color: var(--violet);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 850;
  font-size: clamp(1.5rem, 5.4vw, 2.15rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-faq .faq-sec__lead {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(17, 23, 37, .74);
}

/* ---- 图片 ---- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--hair-dark);
  background: var(--ink);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 9px 13px;
  border-top: 1px solid rgba(242, 236, 225, .14);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--grey);
}

.page-faq .faq-plate {
  margin: 0;
  border: 1px solid var(--hair);
  background: var(--deep);
  overflow: hidden;
}

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

.page-faq .faq-plate figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--grey);
}

/* ---- 内联结构图 ---- */
.page-faq .faq-diagram {
  margin: 0 0 22px;
  padding: 16px 16px 12px;
  border: 1px solid var(--hair-dark);
  background: rgba(222, 212, 196, .38);
}

.page-faq .faq-diagram__svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 168px;
}

.page-faq .faq-diagram__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .05em;
  line-height: 1.7;
  color: rgba(17, 23, 37, .58);
}

/* ---- 问答条目 ---- */
.page-faq .faq-qa-list {
  display: grid;
}

.page-faq .qa {
  border-top: 1px solid var(--hair-dark);
}

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

.page-faq .qa__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 15px 0 15px 0;
  border-left: 3px solid transparent;
  margin-left: -1px;
  padding-left: 12px;
  cursor: pointer;
  list-style: none;
  transition: border-color var(--dur) var(--ease);
}

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

.page-faq .qa__head:hover,
.page-faq .qa__head:focus-visible {
  border-left-color: var(--cyan);
}

.page-faq .qa__head:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 2px;
}

.page-faq .qa[open] > .qa__head {
  border-left-color: var(--violet);
}

.page-faq .qa__num {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--violet);
  white-space: nowrap;
}

.page-faq .qa__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa__head:hover .qa__title {
  color: var(--deep);
}

.page-faq .qa__mark {
  position: relative;
  align-self: center;
  flex: none;
  width: 12px;
  height: 12px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: rgba(17, 23, 37, .62);
  transition: transform var(--dur) var(--ease);
}

.page-faq .qa__mark::before {
  top: 50%;
  left: 0;
  width: 12px;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  left: 50%;
  top: 0;
  width: 1px;
  height: 12px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa__body {
  padding: 0 0 20px 15px;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(17, 23, 37, .84);
}

.page-faq .qa__body p {
  margin: 0 0 12px;
  max-width: 44em;
}

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

/* ---- 术语标签 ---- */
.page-faq .term {
  position: relative;
  display: inline-block;
  padding: 0 4px;
  font-family: var(--font-mono);
  font-size: .84em;
  letter-spacing: .04em;
  color: var(--deep);
  background: rgba(53, 232, 210, .18);
  border-bottom: 1px solid rgba(53, 232, 210, .7);
  cursor: help;
}

.page-faq .term::after {
  content: attr(data-def);
  position: absolute;
  left: 0;
  bottom: calc(100% + 9px);
  width: max-content;
  max-width: min(260px, 70vw);
  padding: 8px 11px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0;
  line-height: 1.65;
  opacity: 0;
  visibility: hidden;
  z-index: 6;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.page-faq .term:hover::after,
.page-faq .term:focus-visible::after {
  opacity: 1;
  visibility: visible;
}

/* ---- 核对通道 ---- */
.page-faq .faq-sec--verify {
  background: var(--paper);
}

.page-faq .faq-contact {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--hair-dark);
}

.page-faq .faq-contact__label {
  margin: 0 0 14px;
  color: var(--violet);
}

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

.page-faq .faq-contact__item {
  display: grid;
  gap: 3px;
  padding: 12px 14px;
  background: var(--paper);
}

.page-faq .faq-contact__key {
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(17, 23, 37, .5);
}

.page-faq .faq-contact__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  text-decoration: none;
  word-break: break-word;
}

.page-faq a.faq-contact__val {
  border-bottom: 1px solid rgba(17, 23, 37, .28);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-faq .faq-contact__note {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(17, 23, 37, .66);
}

.page-faq .faq-sec__foot {
  margin: 24px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--hair-dark);
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(17, 23, 37, .7);
}

.page-faq .faq-sec__foot a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 43, 79, .3);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ============ 平板 ============ */
@media (min-width: 700px) {
  .page-faq .faq-hero {
    padding: 36px 0 54px;
  }

  .page-faq .faq-sec {
    padding: 32px 34px 34px;
  }

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

  .page-faq .faq-contact__item {
    padding: 14px 18px;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 52px 0 64px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
    margin-top: 38px;
  }

  .page-faq .faq-hero__intro {
    font-size: 17px;
  }

  .page-faq .faq-answers {
    gap: 34px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body__grid {
    grid-template-columns: minmax(190px, 236px) minmax(0, 1fr);
    gap: 50px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 36px;
  }

  .page-faq .faq-toc__list {
    display: block;
  }

  .page-faq .faq-toc__item + .faq-toc__item {
    margin-top: 2px;
  }

  .page-faq .faq-toc__link {
    display: block;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 1px solid var(--hair);
    font-size: 13.5px;
    white-space: normal;
    line-height: 1.55;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link:focus-visible {
    border-left-color: var(--cyan);
    color: var(--paper);
  }

  .page-faq .faq-toc__num {
    display: block;
    margin-bottom: 3px;
  }

  .page-faq .qa__title {
    font-size: 16.5px;
  }

  .page-faq .qa__body {
    padding-left: 15px;
  }
}

/* ============ 动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 1ms !important;
  }
}