.page-faq {
  --faq-gap: clamp(46px, 7vw, 96px);
  --faq-pad: clamp(18px, 3vw, 34px);
  background: var(--black);
  color: var(--white);
  padding-top: calc(var(--header-h) + 28px);
  padding-bottom: clamp(56px, 9vw, 120px);
  overflow-wrap: break-word;
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
}

.page-faq .faq-main {
  display: grid;
  gap: var(--faq-gap);
  min-width: 0;
}

/* ---------- 面包屑与首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  padding-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--stroke);
  min-width: 0;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 74px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  max-width: 15ch;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--white);
  opacity: 0.76;
}

.page-faq .faq-hero__keys {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--stroke);
  border: 1px solid var(--stroke);
}

.page-faq .faq-hero__keys li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
  padding: 16px 18px;
  min-width: 0;
}

.page-faq .faq-hero__keys .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-faq .faq-hero__keys li > span:last-child {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */

.page-faq .faq-block {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-top: clamp(18px, 3vw, 30px);
  border-top: 1px solid var(--stroke);
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-block__head {
  display: grid;
  gap: 10px;
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  max-width: 20ch;
}

.page-faq .faq-block__sub {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 四步进度条 ---------- */

.page-faq .faq-track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

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

.page-faq .faq-track__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--stroke);
  color: var(--white);
  text-decoration: none;
  transition: border-color 0.26s ease-out, background-color 0.26s ease-out;
}

.page-faq .faq-track__link:hover,
.page-faq .faq-track__link:focus-visible {
  border-color: var(--green);
  background: var(--layer);
}

.page-faq .faq-track__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--green);
  flex: 0 0 auto;
}

.page-faq .faq-track__name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--stroke);
  background: var(--pitch);
  overflow: hidden;
}

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

.page-faq .faq-figure .media__cap {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--stroke);
  background: var(--panel);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 四步卡片 ---------- */

.page-faq .faq-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 22px);
}

.page-faq .faq-step {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: var(--faq-pad);
  background: var(--panel);
  border: 1px solid var(--stroke);
  border-left: 3px solid var(--violet);
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-step__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--violet);
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-faq .faq-step__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 手风琴问答 ---------- */

.page-faq .faq-qa {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--stroke);
}

.page-faq .qa {
  border-bottom: 1px solid var(--stroke);
  min-width: 0;
}

.page-faq .faq-step .qa {
  border-bottom: 0;
  border-top: 1px solid var(--stroke);
  margin-top: 2px;
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--white);
  transition: color 0.22s ease-out;
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q:hover {
  color: var(--green);
}

.page-faq .qa__q > span:nth-child(2) {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-right: 2px solid var(--green);
  border-bottom: 2px solid var(--green);
  transform: rotate(45deg);
  transition: transform 0.28s ease-out;
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
}

.page-faq .qa__no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--green);
}

.page-faq .qa__a {
  padding: 0 0 18px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
  animation: faq-open 0.28s ease-out both;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 64ch;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 说明引用块 ---------- */

.page-faq .faq-quote {
  display: grid;
  gap: 8px;
  padding: 16px 20px;
  background: var(--layer);
  border-left: 3px solid var(--orange);
}

.page-faq .faq-quote__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-faq .faq-quote p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--white);
  opacity: 0.84;
}

/* ---------- 收尾 ---------- */

.page-faq .faq-cta {
  display: grid;
  gap: 22px;
  padding: var(--faq-pad);
  background: linear-gradient(140deg, var(--panel) 0%, var(--layer) 100%);
  border: 1px solid var(--stroke);
  border-bottom: 3px solid var(--green);
}

.page-faq .faq-cta__col {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

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

.page-faq .faq-cta__btn {
  justify-self: start;
}

.page-faq .faq-deep {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--stroke);
  border: 1px solid var(--stroke);
}

.page-faq .faq-deep__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  background: var(--panel);
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
  transition: background-color 0.24s ease-out, color 0.24s ease-out;
}

.page-faq .faq-deep__link:hover,
.page-faq .faq-deep__link:focus-visible {
  background: var(--layer);
  color: var(--green);
}

.page-faq .faq-deep__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--violet);
  flex: 0 0 auto;
}

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

/* ---------- 右侧目录 ---------- */

.page-faq .faq-index {
  display: none;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-faq .section-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--stroke);
}

.page-faq .section-index__item {
  min-width: 0;
}

.page-faq .section-index__link {
  display: block;
  padding: 8px 0 8px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.22s ease-out, border-color 0.22s ease-out;
}

.page-faq .section-index__link:hover,
.page-faq .section-index__link:focus-visible,
.page-faq .section-index__link[aria-current="true"] {
  color: var(--white);
  border-left-color: var(--green);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-cta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-cta__btn {
    grid-column: 1 / -1;
  }
  .page-faq .faq-deep {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .faq-hero__keys {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .faq-track__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-cta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .faq-cta__btn {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 176px;
    column-gap: clamp(32px, 4vw, 64px);
  }
  .page-faq .faq-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__a {
    animation: none;
  }
  .page-faq .qa__q::after,
  .page-faq .faq-track__link,
  .page-faq .faq-deep__link,
  .page-faq .section-index__link {
    transition: none;
  }
}