.page-faq {
  --faq-line: var(--ink-700);
  --faq-line-strong: #3A444D;
  --faq-glow: rgba(255, 77, 0, 0.16);
}

.page-faq [hidden] {
  display: none !important;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ink-800) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-800) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -100px;
  top: 12%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--faq-glow), transparent 70%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  margin-bottom: 32px;
}

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

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-700);
}

.page-faq .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--bolt);
}

.page-faq .breadcrumb [aria-current="page"] {
  color: var(--mist);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

.page-faq .faq-hero__copy h1 {
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 14px 0 22px;
  max-width: 15ch;
}

.page-faq .faq-hero__lede {
  color: var(--steel);
  font-size: 17px;
  line-height: 1.9;
  max-width: 48ch;
  margin: 0;
}

.page-faq .faq-hero__stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 36px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__stats b {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--lava);
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__stats span {
  font-size: 14px;
  color: var(--steel);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--faq-line);
  border-radius: 2px;
  overflow: hidden;
}

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

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

/* ---------- 问答板 ---------- */

.page-faq .faq-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
  align-items: start;
}

.page-faq .faq-index__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
  margin: 0 0 14px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 11px 10px 11px 12px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--bolt);
  border-left-color: var(--lava);
  background: var(--ink-800);
}

.page-faq .faq-index__list a:focus-visible {
  outline: 2px solid var(--bolt);
  outline-offset: -3px;
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--lava);
  flex: none;
}

@media (min-width: 960px) {
  .page-faq .faq-board {
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

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

/* ---------- 筛选 ---------- */

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 20px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--faq-line);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  margin-bottom: clamp(40px, 6vw, 64px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink-700);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--lava);
  flex: none;
}

.page-faq .faq-group__title {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
  line-height: 1.25;
}

.page-faq .faq-group__intro {
  color: var(--steel);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
  margin: 16px 0 20px;
}

.page-faq .faq-group__intro a {
  color: var(--wire);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 156, 255, 0.4);
}

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

/* ---------- 问答条目 ---------- */

.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-radius: 2px;
  background: var(--ink-800);
  margin-bottom: 10px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

.page-faq .faq-item[open] {
  border-color: var(--lava);
  background: var(--ink-850);
}

.page-faq .faq-item > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  min-height: 44px;
  padding: 18px 20px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .faq-item > summary:hover {
  color: #FFFFFF;
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--bolt);
  outline-offset: -3px;
  color: #FFFFFF;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  margin-left: auto;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--lava);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  background: var(--paper);
  color: var(--paper-ink);
  padding: 18px 20px 22px;
  font-size: 16px;
  line-height: 1.9;
  border-top: 1px solid var(--lava);
}

.page-faq .faq-item__a p {
  margin: 0 0 0.85em;
  max-width: 68ch;
}

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

.page-faq .faq-item__a code {
  font-family: var(--font-mono);
  font-size: 0.93em;
  font-weight: 700;
  color: var(--soil);
  background: rgba(255, 77, 0, 0.1);
  padding: 1px 5px;
  border-radius: 2px;
  white-space: nowrap;
}

.page-faq .faq-item__a a {
  color: var(--soil);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--lava);
}

.page-faq .faq-group__figure {
  margin: 22px 0 0;
  border: 1px solid var(--faq-line);
  border-radius: 2px;
  overflow: hidden;
}

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

/* ---------- 收口 ---------- */

.page-faq .faq-contact__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  background: var(--ink-800);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--lava);
  border-radius: 2px;
  padding: clamp(24px, 4vw, 48px);
}

.page-faq .faq-contact__title {
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 12px 0 16px;
}

.page-faq .faq-contact__text {
  color: var(--steel);
  font-size: 16px;
  line-height: 1.9;
  max-width: 46ch;
  margin: 0 0 24px;
}

.page-faq .faq-contact__list {
  margin: 0;
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-faq .faq-contact__list > div {
  border-top: 1px solid var(--faq-line);
  padding-top: 14px;
}

.page-faq .faq-contact__list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
  margin-bottom: 6px;
}

.page-faq .faq-contact__list dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--mist);
  overflow-wrap: anywhere;
}

@media (min-width: 860px) {
  .page-faq .faq-contact__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
}

@media (max-width: 520px) {
  .page-faq .faq-index__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-item > summary {
    font-size: 16px;
    padding: 16px;
  }

  .page-faq .faq-item__a {
    padding: 16px 16px 20px;
    font-size: 15px;
  }

  .page-faq .faq-hero__stats {
    gap: 14px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-index__list a {
    transition: none;
  }
}