.page-faq {
  --faq-num: rgba(11, 27, 51, .22);
  --faq-body: rgba(11, 27, 51, .72);
  --faq-faint: rgba(11, 27, 51, .52);
  --faq-indent: clamp(3.4rem, 8vw, 6.5rem);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(44px, 8vw, 92px);
}

.page-faq .crumbs {
  margin: 0 0 clamp(20px, 4vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  max-width: 19ch;
  font-family: var(--font-sans);
  font-size: clamp(1.95rem, 7.4vw, 3.5rem);
  font-weight: 800;
  font-style: italic;
  font-stretch: 105%;
  line-height: 1.1;
  letter-spacing: -.015em;
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.75;
  color: var(--ink-70);
}

.page-faq .faq-hero__figure {
  margin: clamp(26px, 5vw, 44px) 0 0;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-toc {
  margin-top: clamp(40px, 8vw, 76px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faq-faint);
}

.page-faq .faq-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc__item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  column-gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-toc__no {
  padding-top: .22em;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--faq-num);
}

.page-faq .faq-toc__link {
  display: inline-block;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-faq .faq-toc__link[aria-current="page"] {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-faq .faq-toc__hint {
  margin: 5px 0 0;
  font-size: .88rem;
  line-height: 1.6;
  color: var(--faq-faint);
}

/* ---------- 章节骨架 ---------- */

.page-faq .faq-sec {
  margin-top: clamp(52px, 9vw, 96px);
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-faq .faq-sec__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--faq-num);
}

.page-faq .faq-sec__title {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(1.32rem, 4.4vw, 1.95rem);
  font-weight: 800;
  font-style: italic;
  font-stretch: 105%;
  line-height: 1.2;
  letter-spacing: -.01em;
}

.page-faq .faq-sec__lead {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: .98rem;
  line-height: 1.72;
  color: var(--faq-faint);
}

.page-faq .faq-sec__body {
  margin-top: clamp(20px, 4vw, 30px);
}

.page-faq .faq-sec__figure {
  margin: clamp(22px, 4vw, 34px) 0 0;
}

/* ---------- 问答折叠 ---------- */

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

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

.page-faq .qa__q {
  position: relative;
  display: block;
  padding: 17px 42px 17px 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
  transition: color .2s var(--ease);
}

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

.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--orange);
}

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 6px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 400;
  line-height: 1;
  color: var(--faq-faint);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
  color: var(--orange);
}

.page-faq .qa__a {
  padding: 2px 0 22px;
  max-width: 66ch;
  font-size: .97rem;
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .qa__a p {
  margin: 0 0 12px;
}

.page-faq .qa__a p:last-child {
  margin-bottom: 0;
}

.page-faq .qa__a a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover {
  color: var(--orange);
}

/* ---------- 编号步骤 ---------- */

.page-faq .steps {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .steps li {
  display: grid;
  grid-template-columns: 1.75rem minmax(0, 1fr);
  column-gap: 12px;
  align-items: start;
  padding: 10px 0;
  border-top: 1px dashed var(--line);
  font-size: .94rem;
  line-height: 1.65;
}

.page-faq .steps li:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-faq .steps__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--mint);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  line-height: 1;
}

/* ---------- 三阶段步骤索引 ---------- */

.page-faq .faq-steps {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
  margin-top: clamp(22px, 4vw, 32px);
}

.page-faq .faq-steps__col {
  padding: clamp(18px, 3vw, 24px) clamp(16px, 3vw, 22px);
  border-top: 2px solid var(--ink);
  background: rgba(255, 255, 255, .48);
}

.page-faq .faq-steps__col:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-faq .faq-steps__col:nth-child(2) {
  border-top-color: var(--orange);
}

.page-faq .faq-steps__col:nth-child(3) {
  border-top-color: var(--ink);
}

.page-faq .faq-steps__phase {
  margin: 0 0 12px;
  font-size: 1.04rem;
  font-weight: 800;
  letter-spacing: .02em;
}

.page-faq .faq-steps__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps__list li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  column-gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  border-top: 1px solid var(--line-soft);
  font-size: .92rem;
  line-height: 1.62;
  color: var(--faq-body);
}

.page-faq .faq-steps__list li:first-child {
  border-top: 0;
}

.page-faq .faq-steps__no {
  font-family: var(--font-mono);
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--faq-faint);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-faq .faq-contact__card {
  padding: clamp(20px, 3.4vw, 28px);
  border: 1px solid var(--line);
  background: var(--mint);
}

.page-faq .faq-contact__card--dark {
  border-color: var(--deep);
  background: var(--deep);
  color: var(--paper);
}

.page-faq .faq-contact__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faq-faint);
}

.page-faq .faq-contact__card--dark .faq-contact__label {
  color: var(--on-deep-dim);
}

.page-faq .faq-contact__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3.6vw, 1.3rem);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.3;
  overflow-wrap: anywhere;
  text-decoration: none;
  color: var(--ink);
  transition: color .2s var(--ease);
}

.page-faq .faq-contact__card--dark .faq-contact__value {
  color: var(--cyan);
}

.page-faq .faq-contact__card:hover .faq-contact__value {
  color: var(--orange);
}

.page-faq .faq-contact__note {
  margin: 12px 0 0;
  max-width: 42ch;
  font-size: .9rem;
  line-height: 1.68;
  color: var(--faq-body);
}

.page-faq .faq-contact__card--dark .faq-contact__note {
  color: var(--on-deep);
}

.page-faq .faq-contact__note a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-contact__note a:hover {
  color: var(--orange);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-sec__head {
    display: grid;
    grid-template-columns: var(--faq-indent) minmax(0, 1fr);
    column-gap: clamp(16px, 3vw, 32px);
    align-items: start;
  }

  .page-faq .faq-sec__no {
    grid-row: 1 / span 2;
    grid-column: 1;
    margin-bottom: 0;
  }

  .page-faq .faq-sec__title {
    grid-row: 1;
    grid-column: 2;
    max-width: 22ch;
  }

  .page-faq .faq-sec__lead {
    grid-row: 2;
    grid-column: 2;
    margin-top: 10px;
  }

  .page-faq .faq-sec__body,
  .page-faq .faq-sec__figure,
  .page-faq .faq-steps,
  .page-faq .faq-contact {
    margin-left: calc(var(--faq-indent) + clamp(16px, 3vw, 32px));
  }

  .page-faq .faq-sec__figure {
    max-width: 720px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__link,
  .page-faq .qa__q,
  .page-faq .faq-contact__value {
    transition: none;
  }
}