.page-faq {
  --faq-rail: 246px;
  --faq-gap: 56px;
  --faq-line: rgba(244, 241, 234, .16);
  --faq-line-strong: rgba(244, 241, 234, .3);
  display: block;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-faq .breadcrumb {
  padding-top: 26px;
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ash);
}

.page-faq .breadcrumb__link {
  color: var(--ash);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .breadcrumb__link:hover {
  color: var(--paper);
  border-bottom-color: var(--rosso);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(169, 166, 158, .5);
}

.page-faq .breadcrumb__current {
  color: var(--paper);
}

/* ---------- 刊头 ---------- */
.page-faq .faq-masthead {
  position: relative;
  padding: clamp(30px, 5vw, 64px) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(120% 130% at 8% 0%, rgba(18, 41, 79, .62) 0%, rgba(11, 12, 15, 0) 62%),
    linear-gradient(180deg, rgba(59, 42, 107, .22) 0%, rgba(11, 12, 15, 0) 70%);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-masthead__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-masthead__text {
  max-width: 46ch;
}

.page-faq .faq-masthead__title {
  margin: 18px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(36px, 6.2vw, 80px);
  font-weight: 900;
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--paper);
  transform: skewX(-1.5deg);
}

.page-faq .faq-masthead__lede {
  margin: 0 0 26px;
  max-width: 52ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.75;
  color: var(--ash);
}

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

.page-faq .faq-masthead__tag {
  padding: 6px 12px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ash);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-masthead__tag:hover {
  border-color: var(--neon);
  color: var(--paper);
}

.page-faq .faq-masthead__media {
  position: relative;
  margin: 0;
  padding: 8px;
  border: 1px solid var(--faq-line-strong);
  background: linear-gradient(155deg, rgba(18, 41, 79, .55) 0%, rgba(11, 12, 15, 0) 68%);
}

.page-faq .faq-masthead__media::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: clamp(64px, 16vw, 132px);
  height: 4px;
  background: linear-gradient(90deg, var(--rosso) 0 58%, var(--neon) 58% 100%);
}

.page-faq .faq-masthead__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(.9) contrast(1.05);
}

/* ---------- 高频三问 ---------- */
.page-faq .faq-hot {
  position: relative;
  padding: clamp(44px, 6vw, 84px) 0 clamp(48px, 6vw, 88px);
  background: linear-gradient(158deg, rgba(122, 18, 36, .95) 0%, rgba(59, 42, 107, .72) 46%, rgba(11, 12, 15, .99) 100%);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hot__head {
  max-width: 60ch;
}

.page-faq .faq-hot__head::after {
  content: "";
  display: block;
  width: clamp(96px, 20vw, 236px);
  height: 6px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--neon) 0 34%, var(--blue) 34% 67%, var(--paper) 67% 100%);
}

.page-faq .faq-hot__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-hot__list {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(244, 241, 234, .26);
}

.page-faq .faq-hot__item {
  display: grid;
  gap: 6px 28px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid rgba(244, 241, 234, .26);
}

.page-faq .faq-hot__num {
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--neon);
}

.page-faq .faq-hot__q {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-hot__a {
  margin: 0;
  max-width: 66ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(244, 241, 234, .82);
}

/* ---------- 分组问答 ---------- */
.page-faq .faq-board {
  padding: clamp(48px, 6vw, 88px) 0 clamp(52px, 6vw, 96px);
}

.page-faq .faq-board__grid {
  display: grid;
  gap: 32px;
}

.page-faq .faq-rail {
  border-top: 1px solid var(--faq-line-strong);
  padding-top: 16px;
}

.page-faq .faq-rail__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ash);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--ash);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__no {
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(169, 166, 158, .7);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--paper);
  border-color: var(--faq-line-strong);
  transform: translateY(-2px);
}

.page-faq .faq-rail__link.is-active {
  color: var(--paper);
  border-color: var(--rosso);
  background: linear-gradient(180deg, rgba(200, 16, 46, .28) 0%, rgba(11, 12, 15, 0) 100%);
}

.page-faq .faq-rail__link.is-active .faq-rail__no {
  color: var(--neon);
}

.page-faq .faq-rail__link:focus-visible,
.page-faq .faq-item__q:focus-visible,
.page-faq .faq-help__links a:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

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

.page-faq .faq-group {
  padding-bottom: clamp(28px, 4vw, 44px);
  scroll-margin-top: 110px;
}

.page-faq .faq-group + .faq-group {
  border-top: 1px solid var(--faq-line);
  padding-top: clamp(28px, 4vw, 44px);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-group__num {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--rosso);
  border-bottom: 2px solid var(--rosso);
  padding-bottom: 2px;
}

.page-faq .faq-group__figure {
  margin: 0;
  width: min(300px, 100%);
  border: 1px solid var(--faq-line);
  padding: 5px;
  background: linear-gradient(150deg, rgba(15, 59, 54, .5) 0%, rgba(11, 12, 15, 0) 70%);
}

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

.page-faq .faq-list {
  margin-top: 14px;
}

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

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

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 42px 18px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15.5px, 1.7vw, 17.5px);
  line-height: 1.55;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ash);
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "\2212";
  color: var(--neon);
}

.page-faq .faq-item__q:hover {
  padding-left: 10px;
  background: linear-gradient(90deg, rgba(18, 41, 79, .45) 0%, rgba(11, 12, 15, 0) 72%);
}

.page-faq .faq-item__idx {
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(169, 166, 158, .8);
  flex: 0 0 auto;
}

.page-faq .faq-item__a {
  margin: 0 0 0 4px;
  padding: 2px 0 20px 20px;
  border-left: 2px solid var(--neon);
  animation: faq-rise 180ms var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 241, 234, .84);
}

.page-faq .faq-item__a a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--blue);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

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

@keyframes faq-rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 术语小词典 ---------- */
.page-faq .faq-glossary {
  background: linear-gradient(178deg, var(--teal) 0%, #0A2A26 62%, var(--ink) 100%);
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
  padding: clamp(46px, 6vw, 88px) 0;
}

.page-faq .faq-glossary .section__lede {
  color: rgba(244, 241, 234, .78);
}

.page-faq .faq-terms {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(244, 241, 234, .24);
}

.page-faq .faq-term {
  padding: 20px 0;
  border-bottom: 1px solid rgba(244, 241, 234, .24);
  transition: transform var(--t-fast) var(--ease);
}

.page-faq .faq-term__key {
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.7vw, 17px);
  letter-spacing: .04em;
  color: var(--neon);
  margin-bottom: 8px;
}

.page-faq .faq-term__val {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 241, 234, .84);
}

.page-faq .faq-term:hover {
  transform: translateX(4px);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-help {
  padding: clamp(44px, 6vw, 84px) 0 clamp(56px, 7vw, 96px);
  background:
    radial-gradient(110% 120% at 92% 10%, rgba(122, 18, 36, .5) 0%, rgba(11, 12, 15, 0) 62%),
    var(--graphite);
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 28px;
  align-items: end;
}

.page-faq .faq-help__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.15;
  color: var(--paper);
}

.page-faq .faq-help__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ash);
}

.page-faq .faq-help__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-masthead__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-hot__item {
    grid-template-columns: 74px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-faq .faq-hot__num {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-faq .faq-hot__q {
    grid-column: 2;
    grid-row: 1;
  }

  .page-faq .faq-hot__a {
    grid-column: 2;
    grid-row: 2;
  }

  .page-faq .faq-terms {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 56px;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

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

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    border-top: 0;
    border-left: 2px solid var(--faq-line-strong);
    padding: 2px 0 2px 18px;
  }

  .page-faq .faq-rail__nav {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    display: flex;
    justify-content: flex-start;
    width: 100%;
    padding: 10px 12px;
    border-color: transparent;
    border-left: 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    white-space: normal;
    font-size: 14px;
  }

  .page-faq .faq-rail__link:hover {
    transform: translateX(3px);
    border-color: transparent;
    background: rgba(18, 41, 79, .38);
  }

  .page-faq .faq-rail__link.is-active {
    border-color: transparent;
    border-left: 3px solid var(--rosso);
    background: linear-gradient(90deg, rgba(200, 16, 46, .26) 0%, rgba(11, 12, 15, 0) 100%);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-board__grid {
    --faq-gap: 76px;
  }

  .page-faq .faq-rail {
    --faq-rail: 268px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-term:hover,
  .page-faq .faq-item__q:hover {
    transform: none;
  }

  .page-faq .faq-rail__link,
  .page-faq .faq-term,
  .page-faq .faq-item__q {
    transition: none;
  }
}