.page-faq {
  --faq-gap: clamp(24px, 3.5vw, 48px);
  --faq-radius: 0px;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq [id] {
  scroll-margin-top: 96px;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* 页头 */
.page-faq .faq-head {
  position: relative;
  padding-block: clamp(22px, 3.6vw, 44px) clamp(20px, 3vw, 34px);
}

.page-faq .faq-head__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-faq .faq-head__kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--amber);
  flex: 0 0 auto;
}

.page-faq .faq-head h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 20ch;
}

.page-faq .faq-head__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

/* 主骨架 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
  border-top: 2px solid var(--line);
  padding-top: clamp(20px, 3vw, 34px);
}

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

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 204px;
  }
}

/* 侧边索引 */
.page-faq .faq-aside {
  order: -1;
  min-width: 0;
}

.page-faq .faq-aside__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

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

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

.page-faq .faq-aside__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-sizing: border-box;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--bright);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
}

.page-faq .faq-aside__link:hover,
.page-faq .faq-aside__link:focus-visible {
  border-color: var(--amber);
  background: var(--ink-200);
  color: var(--paper);
  outline: none;
}

.page-faq .faq-aside__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

@media (min-width: 1024px) {
  .page-faq .faq-aside {
    order: 0;
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-aside__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-aside__link {
    width: 100%;
    min-height: 0;
    padding: 9px 10px;
    border-color: transparent;
    border-left: 2px solid var(--line);
    white-space: normal;
  }

  .page-faq .faq-aside__link:hover,
  .page-faq .faq-aside__link:focus-visible {
    border-left-color: var(--amber);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }
}

/* 章节通用 */
.page-faq .faq-section {
  padding-block: clamp(22px, 3.2vw, 40px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 14px;
}

.page-faq .faq-section__num,
.page-faq .qa-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .faq-section h2,
.page-faq .qa-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-section__intro {
  margin: 0 0 20px;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* 三步图 */
.page-faq .steps {
  display: grid;
  gap: 16px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-faq .steps__item {
  position: relative;
  box-sizing: border-box;
  padding: clamp(15px, 2.2vw, 22px);
  border: 2px solid var(--line);
  border-top: 3px solid var(--amber);
  background: var(--ink-100);
}

.page-faq .steps__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .steps__desc {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

@media (min-width: 760px) {
  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .steps__item:not(:last-child)::after {
    content: "\203A";
    position: absolute;
    right: -16px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 24px;
    line-height: 1;
    color: var(--amber);
    pointer-events: none;
  }
}

/* 图片 */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

.page-faq #matrix .faq-figure {
  margin: 22px 0 0;
}

/* 入口说明 */
.page-faq .entry-note {
  display: grid;
  gap: 8px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--amber);
  background: var(--ink-100);
}

.page-faq .entry-note__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-faq .entry-note p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

/* 筛选条 */
.page-faq .faq-filter {
  margin-top: clamp(22px, 3.2vw, 40px);
  padding: clamp(14px, 2vw, 20px);
  border: 2px solid var(--line);
  background: var(--ink-100);
}

.page-faq .faq-filter__head {
  display: grid;
  gap: 12px;
}

.page-faq .faq-filter__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-filter__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-filter .filter-chip {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--bright);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
}

.page-faq .faq-filter .filter-chip:hover {
  border-color: var(--amber);
  color: var(--paper);
}

.page-faq .faq-filter .filter-chip[aria-pressed="true"],
.page-faq .faq-filter .filter-chip.is-active {
  border-color: var(--amber);
  background: var(--ink-200);
  color: var(--paper);
}

.page-faq .faq-filter .filter-chip:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-faq .faq-filter__empty {
  margin: 14px 0 0;
  padding: 14px 16px;
  border: 1px dashed var(--red);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

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

/* 问答分组 */
.page-faq .qa-group {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-faq .faq-filter__empty + .qa-group {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .qa-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}

.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .qa__trigger {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding: 15px 16px;
  border: 2px solid var(--line);
  background: var(--ink-100);
  color: var(--paper);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease;
}

.page-faq .qa__trigger::before {
  content: "";
  position: absolute;
  left: -2px;
  top: -2px;
  bottom: -2px;
  width: 4px;
  background: var(--amber);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 200ms ease;
}

.page-faq .qa__trigger:hover {
  border-color: var(--glow);
}

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

.page-faq .qa__trigger[aria-expanded="true"] {
  background: var(--ink-200);
}

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

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

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

.page-faq .qa__sign {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--bright);
  transition: color 180ms ease, transform 200ms ease;
}

.page-faq .qa__trigger[aria-expanded="true"] .qa__sign {
  color: var(--amber);
  transform: rotate(45deg);
}

.page-faq .qa__panel {
  padding: 16px 18px 18px;
  border: 2px solid var(--line);
  border-top: 0;
  background: var(--ink-050);
}

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

.page-faq .qa__panel p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

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

/* 联系前准备 */
.page-faq #before-contact {
  border-bottom: 0;
}

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

@media (min-width: 860px) {
  .page-faq .prep {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }
}

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

.page-faq .prep-list__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border-left: 2px solid var(--amber);
  background: var(--ink-100);
}

.page-faq .prep-list__num {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--amber);
}

.page-faq .prep-list__text {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .prep-list__text strong {
  color: var(--paper);
  font-weight: 600;
}

.page-faq .contact-card {
  padding: clamp(16px, 2.4vw, 24px);
  border: 2px solid var(--line);
  background: var(--ink-100);
}

.page-faq .contact-card__row {
  display: grid;
  gap: 4px;
  padding-block: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .contact-card__row:first-child {
  padding-top: 0;
}

.page-faq .contact-card__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .contact-card__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .contact-card__val {
  color: var(--paper);
  font-size: 14.5px;
  line-height: 1.7;
  word-break: break-word;
}

.page-faq .contact-card__val a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}

.page-faq .contact-card__val a:hover,
.page-faq .contact-card__val a:focus-visible {
  border-bottom-color: var(--amber);
  outline: none;
}

/* 窄屏细节 */
@media (max-width: 420px) {
  .page-faq .qa__trigger {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
      "num sign"
      "q q";
    row-gap: 8px;
  }

  .page-faq .qa__num {
    grid-area: num;
  }

  .page-faq .qa__sign {
    grid-area: sign;
    justify-self: end;
  }

  .page-faq .qa__q {
    grid-area: q;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__trigger,
  .page-faq .qa__trigger::before,
  .page-faq .qa__sign,
  .page-faq .faq-aside__link,
  .page-faq .faq-filter .filter-chip {
    transition: none;
  }
}