.page-faq {
  --faq-rail: 236px;
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-mute);
}

.page-faq .breadcrumb a {
  color: var(--text-soft);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover {
  color: var(--board);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--night-900);
  color: var(--fog);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -20%;
  width: 80%;
  height: 140%;
  background: var(--pitch-700);
  opacity: 0.38;
  clip-path: polygon(40% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--whistle) 0%, var(--board) 44%, var(--pitch-500) 100%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  padding-top: 22px;
  padding-bottom: 42px;
}

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(27px, 6vw, 46px);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__desc {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__chips li {
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  background: var(--glass);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-faq .faq-hero__media .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--night-800);
}

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

/* ---------- 三张速答卡 ---------- */
.page-faq .faq-quick {
  padding: 40px 0 44px;
  background: var(--pitch-mist);
  color: var(--ink);
}

.page-faq .faq-quick__head {
  max-width: 62ch;
  margin-bottom: 22px;
}

.page-faq .faq-quick__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(21px, 4vw, 32px);
  line-height: 1.32;
  color: var(--ink);
}

.page-faq .faq-quick__grid {
  display: grid;
  gap: 14px;
}

.page-faq .quick-card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 18px 22px;
  background: var(--fog);
  border-top: 3px solid var(--pitch-700);
}

.page-faq .quick-card__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--whistle);
}

.page-faq .quick-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
}

.page-faq .quick-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(16, 24, 32, 0.76);
}

.page-faq .quick-card__link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 2px;
  font-size: 14px;
  font-weight: 600;
  color: var(--pitch-700);
  text-decoration: none;
  border-bottom: 2px solid var(--whistle);
}

.page-faq .quick-card__link:hover {
  color: var(--whistle);
}

/* ---------- 仪表板式问答 ---------- */
.page-faq .faq-board {
  padding: 44px 0 56px;
  background: var(--night-900);
  color: var(--fog);
}

.page-faq .faq-board__head {
  display: grid;
  gap: 22px;
  margin-bottom: 28px;
}

.page-faq .faq-board__title {
  margin: 8px 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.28;
  color: var(--fog);
}

.page-faq .faq-board__desc {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-soft);
}

.page-faq .faq-board__media .media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--night-700);
}

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

.page-faq .faq-board__body {
  display: grid;
  gap: 20px;
}

/* 分类轨 */
.page-faq .faq-rail {
  position: static;
  min-width: 0;
}

.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-mute);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: auto;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  background: rgba(245, 247, 242, 0.04);
  color: var(--text-soft);
  font-family: var(--font-body);
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-rail__btn:hover {
  background: var(--glass);
  color: var(--fog);
}

.page-faq .faq-rail__btn[aria-pressed="true"] {
  background: var(--pitch-700);
  border-left-color: var(--whistle);
  color: var(--fog);
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--board);
}

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

/* 答案堆叠 */
.page-faq .qa-stack {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-faq .qa-group {
  background: var(--glass);
  border: 1px solid var(--line);
  border-top: 2px solid var(--pitch-500);
}

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

.page-faq .qa-group__head {
  padding: 16px 18px 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .qa-group__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.45;
  color: var(--fog);
}

.page-faq .qa-group__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--whistle);
}

.page-faq .qa-group__desc {
  margin: 6px 0 0 26px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-mute);
}

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

.page-faq .qa-toggle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 18px;
  border: 0;
  background: none;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .qa-toggle:hover {
  background: rgba(245, 247, 242, 0.05);
}

.page-faq .qa-toggle:focus-visible {
  outline: 2px solid var(--board);
  outline-offset: -2px;
}

.page-faq .qa-toggle[aria-expanded="true"] {
  color: var(--board);
}

.page-faq .qa-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--board);
}

.page-faq .qa-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-faq .qa-item__sign::before,
.page-faq .qa-item__sign::after {
  content: "";
  position: absolute;
  background: var(--whistle);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-faq .qa-item__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .qa-item__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .qa-toggle[aria-expanded="true"] .qa-item__sign::after {
  transform: scaleY(0);
}

.page-faq .qa-item__a {
  padding: 0 18px 16px 54px;
}

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

.page-faq .qa-item__a p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 联系区 ---------- */
.page-faq .faq-help {
  padding: 44px 0 52px;
  background: var(--pitch-700);
  color: var(--fog);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 24px;
}

.page-faq .faq-help__title {
  margin: 8px 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.2vw, 34px);
  line-height: 1.3;
  color: var(--fog);
}

.page-faq .faq-help__desc {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 247, 242, 0.82);
}

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

.page-faq .faq-help__panel {
  padding: 20px 18px;
  background: var(--night-900);
  border: 1px solid var(--line-strong);
}

.page-faq .faq-help__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-help__row:last-of-type {
  border-bottom: 0;
}

.page-faq .faq-help__key {
  min-width: 46px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-faq .faq-help__val {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--fog);
  text-decoration: none;
  word-break: break-all;
}

.page-faq .faq-help__val:hover {
  color: var(--board);
}

.page-faq .faq-help__note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-faq .copy-btn {
  padding: 5px 10px;
  border: 0;
  background: var(--whistle);
  color: var(--night-900);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .copy-btn:hover {
  background: var(--board);
}

.page-faq .copy-btn[data-copied] {
  background: var(--pitch-500);
  color: var(--fog);
}

.page-faq .copy-btn:focus-visible {
  outline: 2px solid var(--board);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero__inner {
    padding-top: 30px;
    padding-bottom: 56px;
  }

  .page-faq .faq-quick__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .quick-card {
    padding: 22px 20px 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 44px;
    padding-top: 44px;
    padding-bottom: 68px;
  }

  .page-faq .faq-board__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 44px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-board__body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }

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

  .page-faq .faq-rail__list {
    display: grid;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li {
    flex: 1 1 auto;
  }

  .page-faq .faq-rail__btn {
    width: 100%;
    padding: 11px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-toggle,
  .page-faq .qa-item__sign::before,
  .page-faq .qa-item__sign::after,
  .page-faq .faq-rail__btn,
  .page-faq .copy-btn {
    transition: none;
  }
}