.page-faq {
  --faq-soft: rgba(244, 241, 236, .04);
  background: var(--ink-900);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--ink-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to right,
    var(--paper-08) 0 1px,
    transparent 1px 96px
  );
  opacity: .55;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .7), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .7), transparent 78%);
}

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

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 56px);
}

.page-faq .faq-hero__title {
  margin: 18px 0 0;
  max-width: 14ch;
  font-size: var(--fs-88);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 640px;
  font-size: var(--fs-18);
  line-height: 1.78;
  color: var(--paper-72);
}

.page-faq .faq-hero__facts {
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--slate);
}

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

.page-faq .faq-hero__facts .mono {
  font-size: var(--fs-24);
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .faq-hero__watermark {
  position: absolute;
  right: -0.04em;
  bottom: -0.16em;
  z-index: 0;
  font-family: var(--font-sans);
  font-size: clamp(110px, 25vw, 300px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: .04em;
  white-space: nowrap;
  color: rgba(244, 241, 236, .03);
  -webkit-text-stroke: 1px rgba(200, 16, 46, .22);
  pointer-events: none;
  user-select: none;
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  padding-top: clamp(36px, 5vw, 72px);
  padding-bottom: clamp(36px, 5vw, 72px);
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--slate);
}

.page-faq .faq-rail__nav {
  display: grid;
  gap: 2px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 12px;
  border-left: 1px solid var(--ink-line);
  font-size: var(--fs-14);
  color: var(--paper-52);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-faq .faq-rail__link .mono {
  font-size: var(--fs-12);
  color: var(--slate);
  transition: color .25s var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--paper);
  border-left-color: var(--paper-14);
}

.page-faq .faq-rail__link.is-active {
  padding-left: 11px;
  border-left: 2px solid var(--rosso-600);
  color: var(--paper);
}

.page-faq .faq-rail__link.is-active .mono {
  color: var(--orange);
}

.page-faq .faq-rail__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ink-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate);
}

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

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  padding: clamp(30px, 4vw, 52px) 0;
  border-top: 1px solid var(--ink-line);
}

.page-faq .faq-group:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-group__title {
  margin: 10px 0 0;
  font-size: var(--fs-36);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__intro {
  margin: 12px 0 0;
  max-width: 640px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper-52);
}

.page-faq .faq-group__list {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 折叠面板 ---------- */

.page-faq .accordion__item {
  position: relative;
  border-top: 1px solid var(--ink-line);
}

.page-faq .accordion__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--rosso-600);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .35s var(--ease);
}

.page-faq .accordion__item:has(.accordion__btn[aria-expanded="true"])::before {
  transform: scaleY(1);
}

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

.page-faq .accordion__btn {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 0 18px 16px;
  border: 0;
  background: none;
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  font-weight: 400;
  line-height: 1.55;
  text-align: left;
  color: var(--paper-90);
  cursor: pointer;
  transition: color .25s var(--ease), font-size .25s var(--ease);
}

.page-faq .accordion__btn::after {
  content: "+";
  flex: none;
  margin-left: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--slate);
  transition: color .25s var(--ease);
}

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

.page-faq .accordion__btn[aria-expanded="true"] {
  padding-bottom: 6px;
  font-size: 20px;
  color: var(--paper);
}

.page-faq .accordion__btn[aria-expanded="true"]::after {
  content: "–";
  color: var(--orange);
}

.page-faq .accordion__panel {
  max-width: 660px;
  padding: 0 0 22px 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-72);
}

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

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

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

.page-faq .faq-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(200, 16, 46, .38);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--rosso-400);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-faq .faq-more::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-faq .faq-more:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 检索分组内的图文分栏 ---------- */

.page-faq .faq-group__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: clamp(22px, 3vw, 32px);
}

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

/* ---------- 术语速查 ---------- */

.page-faq .faq-glossary {
  padding: clamp(40px, 5vw, 80px) 0;
  background: var(--ink-700);
  border-top: 1px solid var(--ink-line);
}

.page-faq .faq-glossary__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-faq .faq-glossary__title {
  margin: 10px 0 0;
  font-size: var(--fs-56);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-glossary__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-52);
}

.page-faq .faq-glossary__figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border: 1px solid var(--ink-line);
}

.page-faq .faq-glossary__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 14px 0;
  border-top: 1px solid var(--ink-line);
  border-bottom: 1px solid var(--ink-line);
}

.page-faq .faq-glossary__label {
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--slate);
}

.page-faq .faq-glossary__input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 8px 2px;
  border: 0;
  border-bottom: 1px solid var(--ink-line);
  background: transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .02em;
  color: var(--paper);
  outline: none;
  transition: border-color .25s var(--ease);
}

.page-faq .faq-glossary__input::placeholder {
  font-family: var(--font-sans);
  color: var(--slate);
}

.page-faq .faq-glossary__input:focus {
  border-bottom-color: var(--orange);
}

.page-faq .faq-glossary__count {
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--slate);
}

.page-faq .faq-table__wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: var(--fs-14);
}

.page-faq .faq-table__caption {
  padding: 16px 0 12px;
  text-align: left;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--slate);
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--ink-line);
}

.page-faq .faq-table thead th {
  border-bottom-color: var(--paper-14);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-faq .faq-table tbody th {
  font-weight: 500;
  white-space: nowrap;
  color: var(--paper);
}

.page-faq .faq-table tbody td:nth-child(2) {
  width: 96px;
  white-space: nowrap;
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-faq .faq-table tbody td:nth-child(3) {
  line-height: 1.72;
  color: var(--paper-72);
}

.page-faq .faq-table tbody tr:nth-child(even) {
  background: var(--faq-soft);
}

/* ---------- 快捷入口 ---------- */

.page-faq .faq-next {
  padding: clamp(40px, 5vw, 80px) 0 clamp(48px, 6vw, 96px);
  border-top: 1px solid var(--ink-line);
}

.page-faq .faq-next__title {
  margin: 10px 0 clamp(24px, 3vw, 36px);
  font-size: var(--fs-36);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-next__row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 32px;
  grid-template-areas:
    "tag name arrow"
    "tag desc arrow";
  align-items: center;
  gap: 6px 16px;
  padding: 20px 0;
  border-top: 1px solid var(--ink-line);
  text-decoration: none;
  color: inherit;
  transition: background .25s var(--ease), padding-left .25s var(--ease);
}

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

.page-faq .faq-next__tag {
  grid-area: tag;
  font-size: var(--fs-14);
  color: var(--slate);
  transition: color .25s var(--ease);
}

.page-faq .faq-next__name {
  grid-area: name;
  font-size: var(--fs-24);
  font-weight: 300;
  color: var(--paper);
}

.page-faq .faq-next__desc {
  grid-area: desc;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--paper-52);
}

.page-faq .faq-next__arrow {
  grid-area: arrow;
  justify-self: end;
  font-family: var(--font-mono);
  color: var(--slate);
  transition: color .25s var(--ease);
}

.page-faq .faq-next__row:hover {
  padding-left: 12px;
  background: rgba(244, 241, 236, .03);
}

.page-faq .faq-next__row:hover .faq-next__arrow,
.page-faq .faq-next__row:hover .faq-next__tag {
  color: var(--orange);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-glossary__head {
    grid-template-columns: minmax(0, 1fr) 400px;
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-group__split {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-hero__watermark {
    font-size: 96px;
    opacity: .8;
  }

  .page-faq .faq-hero__facts {
    gap: 8px 20px;
  }

  .page-faq .faq-next__row {
    grid-template-columns: 36px minmax(0, 1fr) 22px;
    gap: 4px 12px;
  }

  .page-faq .faq-next__name {
    font-size: var(--fs-18);
  }

  .page-faq .accordion__btn[aria-expanded="true"] {
    font-size: var(--fs-18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition: none !important;
    animation: none !important;
  }
}