/* ===== 支持中心 · 页面专属样式（作用域 .page-faq） ===== */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(110% 80% at 88% 4%, rgba(53, 224, 255, .13), transparent 58%),
    radial-gradient(85% 70% at 4% 96%, rgba(255, 106, 26, .16), transparent 62%),
    var(--ink);
  color: var(--paper);
  padding:
    calc(var(--header-h) + clamp(2.75rem, 8vw, 5.5rem))
    0
    clamp(4.5rem, 9vw, 7rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(242, 246, 244, .06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(242, 246, 244, .06) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .55;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(30px, 5vw, 58px);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: rgba(242, 246, 244, .55);
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-hero .breadcrumb a {
  color: rgba(242, 246, 244, .78);
  text-decoration: none;
  transition: color .2s var(--ease);
}

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

.page-faq .faq-hero .breadcrumb__sep {
  color: rgba(242, 246, 244, .32);
}

.page-faq .faq-hero .eyebrow {
  color: var(--blue);
  margin-bottom: .85rem;
}

.page-faq .faq-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.5rem, 8.4vw, 5.2rem);
  line-height: .98;
  letter-spacing: -.025em;
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  max-width: 15ch;
}

.page-faq .faq-hero__lead {
  max-width: 42em;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.9vw, 1.0625rem);
  line-height: 1.8;
  color: rgba(242, 246, 244, .82);
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .7rem 1rem;
  max-width: 820px;
  padding: .85rem 1rem;
  border: 1px solid rgba(242, 246, 244, .18);
  background: rgba(18, 51, 43, .6);
  border-radius: var(--radius);
}

.page-faq .faq-quick__label {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(242, 246, 244, .5);
}

.page-faq .faq-quick__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-faq .faq-quick__tags a {
  font-size: .8125rem;
  line-height: 1.4;
  padding: .3rem .72rem;
  border: 1px solid rgba(242, 246, 244, .22);
  border-radius: 999px;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-quick__tags a:hover,
.page-faq .faq-quick__tags a:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
  background: rgba(255, 106, 26, .08);
}

/* ---------- 媒体与引入 ---------- */

.page-faq .faq-media {
  padding-top: clamp(2.25rem, 6vw, 3.5rem);
}

.page-faq .faq-media__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 2.75rem);
  align-items: center;
}

.page-faq .faq-photo {
  position: relative;
  overflow: hidden;
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
}

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

.page-faq .faq-media__copy .section-title {
  margin: 0 0 .75rem;
}

.page-faq .faq-media__copy .section-lead {
  margin: 0;
}

/* ---------- 双栏主体 ---------- */

.page-faq .faq-body {
  padding-top: clamp(2.5rem, 6vw, 4rem);
  padding-bottom: clamp(3.5rem, 8vw, 6rem);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.25rem);
  align-items: start;
}

.page-faq .faq-index {
  padding: .25rem 0 0;
}

.page-faq .faq-index__title {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 .85rem;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .65rem;
  align-items: baseline;
  padding: .65rem .6rem .65rem .85rem;
  border-left: 2px solid var(--line);
  background: transparent;
  color: var(--text);
  font-size: .9375rem;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}

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

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-faq .faq-index__list a:hover .faq-index__num,
.page-faq .faq-index__list a:focus-visible .faq-index__num {
  color: var(--orange);
}

.page-faq .faq-index__note {
  margin: 1rem 0 0;
  padding-left: .85rem;
  border-left: 2px solid var(--line);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.75rem, 6vw, 4.25rem);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 .9rem;
  padding-top: 1rem;
  border-top: 2px solid var(--ink);
  margin-bottom: 1.4rem;
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--orange);
  padding-top: .42rem;
}

.page-faq .faq-group__title {
  margin: 0 0 .4rem;
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--ink);
}

.page-faq .faq-group__lead {
  margin: 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 折叠面板 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: .5rem;
}

.page-faq .faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: #b9c7c1;
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 106, 26, .55);
  box-shadow: var(--shadow-s);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: .7rem;
  align-items: start;
  padding: 1rem 1.05rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: .9688rem;
  line-height: 1.55;
  color: var(--text);
  transition: color .2s var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--ink);
}

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

.page-faq .faq-item__code {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--muted);
  padding-top: .18rem;
}

.page-faq .faq-item[open] .faq-item__code {
  color: var(--orange);
}

.page-faq .faq-item__icon {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: .28rem;
  flex: none;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--ink);
  transition: transform .25s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  margin-top: -1px;
}

.page-faq .faq-item__icon::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
}

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

.page-faq .faq-item[open] .faq-item__icon::before {
  background: var(--orange);
}

.page-faq .faq-item__a {
  padding: 0 1.05rem 1.05rem 1.05rem;
  color: var(--text);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 36em;
  font-size: .9375rem;
  line-height: 1.8;
}

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

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

.page-faq .faq-mono {
  font-family: var(--font-mono);
  font-size: .875em;
  color: var(--ink);
  background: rgba(53, 224, 255, .1);
  padding: .05em .3em;
  border-radius: var(--radius);
  word-break: break-all;
}

.page-faq .faq-photo--device {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  aspect-ratio: 3 / 2;
}

/* ---------- 延伸入口 ---------- */

.page-faq .faq-more {
  margin-top: clamp(2.5rem, 6vw, 3.5rem);
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  background: var(--white);
  border-radius: var(--radius);
}

.page-faq .faq-more__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .faq-more__text a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-item__q {
    padding: 1.1rem 1.25rem;
    font-size: 1rem;
  }

  .page-faq .faq-item__a {
    padding: 0 1.25rem 1.2rem calc(1.25rem + 5.4rem);
  }
}

@media (min-width: 860px) {
  .page-faq .faq-media__inner {
    grid-template-columns: 1.15fr .85fr;
  }

  .page-faq .faq-photo--device {
    aspect-ratio: 3 / 2;
    max-width: 76%;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(190px, 228px) minmax(0, 1fr);
    gap: clamp(2.25rem, 5vw, 4rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    padding-top: .15rem;
  }

  .page-faq .faq-index__list a {
    padding-left: 1rem;
  }
}

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