.page-faq {
  --faq-strip: 3px;
  --faq-row-pad: clamp(15px, 1.6vw, 20px);
}

/* ---------- 首屏：检索 + 版本对照并排 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(34px, 6vw, 74px) 0 clamp(44px, 7vw, 92px);
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .45;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -16%;
  width: 68%;
  height: 176%;
  background: var(--deep-sea);
  clip-path: polygon(32% 0%, 100% 0%, 100% 100%, 0% 100%);
  opacity: .94;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 52px);
  align-items: start;
}

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

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-size: clamp(30px, 5vw, 58px);
  line-height: 1.1;
  letter-spacing: .03em;
  font-weight: 900;
  color: var(--ice);
  overflow-wrap: break-word;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

/* 检索框 */

.page-faq .faq-search {
  margin-top: clamp(24px, 3vw, 34px);
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--deep-sea);
  border: 1px solid var(--line);
  border-top: var(--faq-strip) solid var(--cyan);
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-search__input {
  display: block;
  width: 100%;
  min-height: 56px;
  padding: 0 16px;
  background: var(--ink-black);
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.4;
  appearance: none;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-faq .faq-search__input::placeholder {
  color: #5f7691;
}

.page-faq .faq-search__input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--cyan);
}

.page-faq .faq-search__meta {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .faq-search__empty {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--alert);
}

.page-faq .faq-hero__shot {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
}

.page-faq .faq-hero__shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--deep-dive);
  object-fit: cover;
}

.page-faq .faq-hero__shot figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 版本对照速查 */

.page-faq .faq-quick {
  min-width: 0;
  padding: clamp(20px, 2.6vw, 30px);
  background: rgba(18, 59, 92, .55);
  border: 1px solid var(--line);
  border-top: var(--faq-strip) solid var(--alert);
}

.page-faq .faq-quick__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-quick__eyebrow span {
  color: var(--alert);
  margin-right: 8px;
}

.page-faq .faq-quick__title {
  margin: 10px 0 0;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.3;
  letter-spacing: .02em;
  font-weight: 800;
  color: var(--white);
}

.page-faq .faq-matrix {
  margin-top: clamp(16px, 2vw, 22px);
}

.page-faq .faq-matrix__head,
.page-faq .faq-matrix__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
  padding: var(--faq-row-pad) 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-matrix__head {
  padding-top: 10px;
  padding-bottom: 10px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-matrix__key {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-matrix__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ice);
}

.page-faq .faq-matrix__ver--d {
  color: var(--cyan);
}

.page-faq .faq-matrix__val {
  min-width: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ice);
  overflow-wrap: break-word;
}

.page-faq .faq-quick__foot {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-quick__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, .45);
}

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

/* ---------- 分类浏览 ---------- */

.page-faq .faq-browse {
  padding: clamp(52px, 8vw, 112px) 0;
  background: var(--bg);
}

.page-faq .faq-browse__head {
  max-width: 62ch;
}

.page-faq .faq-browse__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-browse__eyebrow span {
  color: var(--alert);
  margin-right: 8px;
}

.page-faq .faq-browse__title {
  margin: 12px 0 0;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.18;
  letter-spacing: .03em;
  font-weight: 900;
  color: var(--ice);
}

.page-faq .faq-browse__lede {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

/* 筛选标签 */

.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 3vw, 32px) 0 clamp(26px, 3.4vw, 38px);
}

.page-faq .faq-filters .filter-btn {
  min-height: 44px;
  padding: 0 16px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-filters .filter-btn:hover {
  color: var(--ice);
  border-color: var(--cyan);
}

.page-faq .faq-filters .filter-btn.is-active {
  background: var(--deep-dive);
  border-color: var(--cyan);
  color: var(--white);
}

/* 列表与配图 */

.page-faq .faq-browse__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 42px);
  align-items: start;
}

.page-faq .faq-list {
  min-width: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item.is-hidden {
  display: none;
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  transition: background-color .18s var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover {
  background: rgba(18, 59, 92, .3);
}

.page-faq .faq-item__tag {
  display: inline-block;
  padding: 3px 7px;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  white-space: nowrap;
}

.page-faq .faq-item__text {
  min-width: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--ice);
  overflow-wrap: break-word;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
  transition: transform .2s var(--ease);
}

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

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

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--deep-dive);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-browse__figure {
  margin: 0;
}

.page-faq .faq-browse__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--deep-sea);
  object-fit: cover;
}

.page-faq .faq-browse__figure figcaption {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 收尾：人工支持 ---------- */

.page-faq .faq-help {
  padding: clamp(50px, 8vw, 108px) 0;
  background: var(--emerald);
  border-top: 1px solid var(--line);
}

.page-faq .faq-help__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-help__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(232, 241, 248, .7);
}

.page-faq .faq-help__eyebrow span {
  color: var(--alert);
  margin-right: 8px;
}

.page-faq .faq-help__title {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: .03em;
  font-weight: 900;
  color: var(--white);
}

.page-faq .faq-help__text {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(232, 241, 248, .82);
}

.page-faq .faq-help__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, .5);
}

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

.page-faq .faq-help__panel {
  padding: clamp(20px, 2.6vw, 32px);
  background: rgba(7, 11, 18, .45);
  border: 1px solid rgba(232, 241, 248, .16);
  border-top: var(--faq-strip) solid var(--alert);
}

.page-faq .faq-help__dl {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
}

.page-faq .faq-help__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(232, 241, 248, .14);
}

.page-faq .faq-help__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(232, 241, 248, .62);
}

.page-faq .faq-help__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-faq .faq-help__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(232, 241, 248, .72);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-matrix__head,
  .page-faq .faq-matrix__row {
    grid-template-columns: 96px minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-matrix__key {
    grid-column: auto;
    padding-top: 3px;
  }

  .page-faq .faq-matrix__val + .faq-matrix__val {
    padding-left: 16px;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-matrix__head .faq-matrix__ver + .faq-matrix__ver {
    padding-left: 16px;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-help__row {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(34px, 4vw, 64px);
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(34px, 4vw, 60px);
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-browse__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-faq .faq-browse__figure {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }
}

@media (max-width: 479px) {
  .page-faq .faq-item__q {
    grid-template-columns: auto minmax(0, 1fr) 14px;
    gap: 10px;
    align-items: start;
    padding: 15px 2px;
  }

  .page-faq .faq-item__mark {
    margin-top: 6px;
  }

  .page-faq .faq-search__input {
    min-height: 52px;
    font-size: 15px;
  }

  .page-faq .faq-filters .filter-btn {
    min-height: 40px;
    padding: 0 13px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark::after,
  .page-faq .faq-search__input,
  .page-faq .faq-filters .filter-btn,
  .page-faq .faq-item__q {
    transition: none;
  }
}