/* ============================================================
   常见问题 — page-faq
   ============================================================ */

.page-faq {
  --faq-accent: var(--c-amber);
  --faq-rule: rgba(30, 74, 62, 0.5);
  --faq-rule-soft: rgba(30, 74, 62, 0.32);
  padding-bottom: 72px;
  font-family: var(--font-body);
  color: var(--c-text);
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: 26px 0 8px;
}

.page-faq .faq-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-amber);
}

.page-faq .faq-hero__kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-amber);
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 7.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-faq .faq-hero__text {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-mute);
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--c-grid);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.05) brightness(0.9);
}

/* ---------- 问题索引目录 ---------- */

.page-faq .faq-directory {
  margin-top: 14px;
  padding-top: 20px;
  border-top: 1px solid var(--c-grid);
}

.page-faq .faq-directory__label {
  display: block;
  margin-bottom: 6px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--c-mute);
}

.page-faq .faq-directory__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-directory__link {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--faq-rule-soft);
  color: var(--c-text);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-directory__link:hover,
.page-faq .faq-directory__link:focus-visible {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
  background: rgba(255, 178, 63, 0.05);
}

.page-faq .faq-directory__link:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-faq .faq-directory__num {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-amber);
}

.page-faq .faq-directory__name {
  font-weight: 700;
}

.page-faq .faq-directory__count {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-mute);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding-top: 54px;
  scroll-margin-top: 92px;
}

.page-faq .faq-group--amber { --faq-accent: var(--c-amber); }
.page-faq .faq-group--track { --faq-accent: var(--c-blue); }
.page-faq .faq-group--cyan  { --faq-accent: var(--c-cyan); }

.page-faq .faq-group__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-top: 24px;
}

.page-faq .faq-group__head {
  display: block;
}

.page-faq .faq-group__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 13vw, 92px);
  line-height: 0.86;
  letter-spacing: -0.06em;
  color: var(--faq-accent);
}

.page-faq .faq-group__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 5vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-faq .faq-group__lead {
  margin: 10px 0 0;
  max-width: 26em;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mute);
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-group__body {
  margin-top: 20px;
  border-top: 1px solid var(--faq-rule);
}

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

.page-faq .faq-item__q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}

.page-faq .faq-item__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 16px;
  align-items: start;
  gap: 10px;
  margin: 0;
  padding: 17px 4px 17px 12px;
  background: none;
  border: 0;
  border-left: 2px solid var(--c-grid);
  color: var(--c-text);
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-item__trigger:hover {
  border-left-color: var(--faq-accent);
  background: rgba(255, 255, 255, 0.02);
}

.page-faq .faq-item__trigger:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__trigger[aria-expanded="true"] {
  border-left-color: var(--c-cyan);
  color: var(--c-amber);
}

.page-faq .faq-item__trigger .expand__index {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--faq-accent);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item__trigger[aria-expanded="true"] .expand__index {
  color: var(--c-cyan);
}

.page-faq .faq-item__trigger .expand__icon {
  position: relative;
  display: block;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  color: var(--c-mute);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-item__trigger .expand__icon::before,
.page-faq .faq-item__trigger .expand__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__trigger .expand__icon::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 1.5px;
}

.page-faq .faq-item__trigger .expand__icon::after {
  top: 0;
  left: 6px;
  width: 1.5px;
  height: 14px;
}

.page-faq .faq-item__trigger[aria-expanded="true"] .expand__icon {
  color: var(--c-cyan);
  transform: rotate(180deg);
}

.page-faq .faq-item__trigger[aria-expanded="true"] .expand__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

/* 答案区 */

.page-faq .faq-item__panel {
  overflow: hidden;
}

.page-faq .faq-item__a {
  margin: 0 0 18px 12px;
  padding: 2px 0 2px 18px;
  border-left: 1px solid var(--c-grid);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-item:has(.faq-item__trigger[aria-expanded="true"]) .faq-item__a {
  border-left-color: var(--c-cyan);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-mute);
}

.page-faq .faq-item__a a {
  color: var(--c-amber-soft);
  text-decoration: underline;
  text-decoration-color: rgba(62, 123, 255, 0.9);
  text-underline-offset: 3px;
}

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

.page-faq .faq-item__a a:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-faq .faq-code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--c-cyan);
  background: rgba(79, 240, 208, 0.08);
  border: 1px solid rgba(79, 240, 208, 0.25);
  padding: 1px 6px;
  white-space: nowrap;
}

/* ---------- 章节间的图 ---------- */

.page-faq .faq-break {
  margin: 48px 0 0;
  border: 1px solid var(--c-grid);
  overflow: hidden;
}

.page-faq .faq-break img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.68) contrast(1.05) brightness(0.88);
}

/* ---------- 收尾指引 ---------- */

.page-faq .faq-next {
  margin-top: 64px;
}

.page-faq .faq-next__title {
  margin: 24px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 4.6vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-faq .faq-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-next__link {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 22px;
  align-items: baseline;
  gap: 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--faq-rule-soft);
  color: var(--c-text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.55;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  color: var(--c-amber);
  background: rgba(255, 178, 63, 0.05);
  padding-left: 10px;
}

.page-faq .faq-next__link:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-faq .faq-next__num {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-blue);
}

.page-faq .faq-next__name {
  font-weight: 600;
}

.page-faq .faq-next__go {
  justify-self: end;
  color: var(--c-mute);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-next__link:hover .faq-next__go,
.page-faq .faq-next__link:focus-visible .faq-next__go {
  color: var(--c-cyan);
  transform: translateX(3px);
}

/* ---------- 署名收束 ---------- */

.page-faq .faq-sign {
  margin-top: 68px;
}

.page-faq .faq-sign__band {
  display: block;
  height: 8px;
  background: linear-gradient(90deg, var(--c-amber) 0%, var(--c-cyan) 52%, var(--c-blue) 100%);
}

.page-faq .faq-sign__text {
  margin: 16px 0 0;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--c-mute);
}

/* ============================================================
   断点
   ============================================================ */

@media (min-width: 640px) {
  .page-faq .faq-directory__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
  }

  .page-faq .faq-item__trigger {
    grid-template-columns: 40px minmax(0, 1fr) 18px;
    gap: 12px;
    font-size: 16px;
    padding: 19px 6px 19px 14px;
  }

  .page-faq .faq-item__a {
    padding-left: 24px;
  }

  .page-faq .faq-item__a p {
    font-size: 15px;
  }
}

@media (min-width: 900px) {
  .page-faq {
    padding-bottom: 96px;
  }

  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    column-gap: 52px;
    row-gap: 0;
    align-items: start;
    padding-top: 40px;
  }

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

  .page-faq .faq-hero__media {
    grid-column: 2;
    grid-row: 1;
    margin-top: 6px;
  }

  .page-faq .faq-directory {
    grid-column: 1 / -1;
    grid-row: 2;
    margin-top: 52px;
  }

  .page-faq .faq-group {
    padding-top: 84px;
  }

  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 3.2fr) minmax(0, 8.8fr);
    column-gap: 52px;
    align-items: start;
  }

  .page-faq .faq-group__head {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-group__body {
    margin-top: 0;
  }

  .page-faq .faq-break {
    margin-top: 72px;
  }

  .page-faq .faq-next {
    margin-top: 88px;
  }

  .page-faq .faq-next__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }

  .page-faq .faq-next__list li:nth-child(odd) .faq-next__link {
    border-right: 0;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-directory__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 44px;
  }

  .page-faq .faq-hero__title {
    font-size: 58px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-directory__link,
  .page-faq .faq-item__trigger,
  .page-faq .faq-item__trigger .expand__icon,
  .page-faq .faq-item__a,
  .page-faq .faq-next__link,
  .page-faq .faq-next__go {
    transition: none;
  }

  .page-faq .faq-next__link:hover .faq-next__go,
  .page-faq .faq-next__link:focus-visible .faq-next__go {
    transform: none;
  }
}