.page-faq {
  --faq-idx: 256px;
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

.page-faq .faq-topbar {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5.5vw, 64px) 0 clamp(30px, 5vw, 58px);
  background: linear-gradient(150deg, #0B1B2B 0%, #14304A 55%, #0B1B2B 100%);
  border-bottom: 8px solid var(--edge);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: 64%;
  height: 200%;
  transform: rotate(17deg);
  background: linear-gradient(180deg, rgba(62, 224, 214, .17), rgba(62, 224, 214, 0) 74%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(20px, 4vw, 42px);
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
  }
}

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

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: .005em;
  color: var(--text);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.72;
}

.page-faq .faq-hero__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-copy[data-copied] {
  border-color: var(--lime);
  color: var(--lime);
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-hero__media .media__caption {
  padding: 9px 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
  border-top: 1px solid var(--hair-soft);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-main {
  padding: clamp(30px, 5vw, 64px) 0 clamp(52px, 8vw, 104px);
}

.page-faq .faq-shell {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-faq .faq-index,
.page-faq .faq-body {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-idx) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 22px;
  }
}

/* ---------- 左侧索引 ---------- */

.page-faq .faq-index {
  border: 2px solid var(--edge);
  background: var(--panel);
  padding: 16px;
  box-shadow: 6px 6px 0 rgba(7, 17, 28, .5);
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-faq .faq-search__input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  background: rgba(7, 17, 28, .55);
  border: 1px solid var(--hair);
  border-radius: 0;
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  appearance: none;
}

.page-faq .faq-search__input::placeholder {
  color: rgba(159, 176, 192, .72);
}

.page-faq .faq-search__input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 2px rgba(62, 224, 214, .18);
}

.page-faq .faq-index__title {
  margin: 18px 0 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-faq .faq-index__list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

@media (min-width: 560px) and (max-width: 999px) {
  .page-faq .faq-index__list {
    grid-template-columns: 1fr 1fr;
  }
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 8px 8px 6px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--text);
  border-left-color: var(--cyan);
  background: rgba(62, 224, 214, .08);
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 90px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 62px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
}

.page-faq .faq-group__head::after {
  content: "";
  flex: 1 1 auto;
  min-width: 26px;
  height: 8px;
  background: linear-gradient(90deg, var(--cyan), rgba(62, 224, 214, 0));
}

.page-faq .faq-group:nth-child(even) .faq-group__head::after {
  background: linear-gradient(90deg, var(--orange), rgba(255, 106, 43, 0));
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  padding: 3px 8px;
  background: var(--orange);
  color: var(--edge);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-faq .faq-group:nth-child(even) .faq-group__num {
  background: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--text);
}

.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 2px solid var(--edge);
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-figure .media__caption {
  padding: 9px 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
  border-top: 1px solid var(--hair-soft);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-item {
  border-bottom: 1px solid var(--hair-soft);
  transition: border-color .2s ease;
}

.page-faq .faq-item[open] {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px 15px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--sans);
  font-size: clamp(15px, 1.5vw, 16.5px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  transition: color .18s ease;
}

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

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

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

.page-faq .faq-q__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-q__mark {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

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

.page-faq .faq-q__mark::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

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

.page-faq .faq-item[open] .faq-q__mark::before,
.page-faq .faq-item[open] .faq-q__mark::after {
  background: var(--lime);
}

.page-faq .faq-a {
  padding: 0 0 18px;
  max-width: 68ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
  overflow-wrap: break-word;
}

.page-faq .faq-a p {
  margin: 0;
}

.page-faq .faq-a p + p {
  margin-top: 10px;
}

.page-faq .faq-steps {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: fs;
  display: grid;
  gap: 7px;
}

.page-faq .faq-steps li {
  counter-increment: fs;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.58;
  color: var(--text);
}

.page-faq .faq-steps li::before {
  content: counter(fs, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 收尾引导 ---------- */

.page-faq .faq-next {
  margin-top: clamp(42px, 6vw, 76px);
  padding: clamp(20px, 3vw, 34px);
  background: var(--paper);
  color: var(--paper-text);
  border: 2px solid var(--edge);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-next h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.22;
  color: var(--paper-text);
}

.page-faq .faq-next p {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-text);
}

.page-faq .faq-next__links {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-next__links a {
  display: inline-block;
  padding: 10px 16px;
  border: 2px solid var(--paper-accent);
  color: var(--paper-accent);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  transition: background .18s ease, color .18s ease;
}

.page-faq .faq-next__links a:hover,
.page-faq .faq-next__links a:focus-visible {
  background: var(--paper-accent);
  color: var(--paper);
}

/* ---------- 窄屏收口 ---------- */

@media (max-width: 599px) {
  .page-faq .faq-index {
    padding: 14px;
    box-shadow: 5px 5px 0 rgba(7, 17, 28, .5);
  }

  .page-faq .faq-q {
    gap: 12px;
    padding: 14px 0;
  }

  .page-faq .faq-hero__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-item,
  .page-faq .faq-index__link {
    transition: none;
  }
}