.page-faq {
  --faq-code-col: 5.25rem;
  --faq-radius: var(--radius-m);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq .faq-crumb {
  margin-bottom: clamp(1.5rem, 4vw, 3rem);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-faq .faq-hero__title {
  margin: 0.35rem 0 0;
  max-width: 18ch;
}

.page-faq .faq-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 58ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2rem);
}

.page-faq .faq-hero__vnote {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  color: var(--orange-500);
}

.page-faq .faq-hero__stats {
  margin: 0;
  display: grid;
  gap: 0.7rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.page-faq .faq-hero__stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-faq .faq-hero__stats dt {
  font-size: var(--fs-meta);
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.68);
}

.page-faq .faq-hero__stats dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

/* ---------- 章节标题 ---------- */
.page-faq .faq-section-head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-h2 {
  margin: 0.4rem 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.15;
}

.page-faq .faq-lede {
  margin: 0.85rem 0 0;
  font-size: var(--fs-body);
  line-height: 1.72;
  color: var(--text-muted);
}

/* ---------- 现象四宫格 ---------- */
.page-faq .faq-symptoms {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-faq .faq-symptom {
  display: grid;
  gap: 0.4rem;
  padding: 1.15rem 1.15rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  color: var(--text);
  text-decoration: none;
  transition: transform 200ms var(--ease-out), border-color 200ms var(--ease-out),
    box-shadow 200ms var(--ease-out);
}

.page-faq .faq-symptom:hover,
.page-faq .faq-symptom:focus-visible {
  transform: translateY(-3px);
  border-color: var(--orange-500);
  box-shadow: 0 12px 26px -18px rgba(11, 27, 43, 0.6);
}

.page-faq .faq-symptom__num {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.14em;
  color: var(--wine-700);
}

.page-faq .faq-symptom__title {
  font-size: var(--fs-h3);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-faq .faq-symptom__desc {
  font-size: 0.9375rem;
  line-height: 1.68;
  color: var(--text-muted);
}

.page-faq .faq-symptom__go {
  margin-top: 0.35rem;
  font-size: var(--fs-meta);
  letter-spacing: 0.08em;
  color: var(--tech-blue-500);
  font-weight: 700;
}

.page-faq .faq-pathmap {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--indigo-700);
}

.page-faq .faq-pathmap img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  transition: border-color 200ms var(--ease-out);
}

.page-faq .faq-item[open] {
  border-color: var(--tech-blue-500);
  box-shadow: 0 16px 32px -26px rgba(11, 27, 43, 0.65);
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--tech-blue-500);
  outline-offset: 2px;
  border-radius: var(--faq-radius);
}

.page-faq .faq-item__code {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.1em;
  color: var(--wine-700);
  white-space: nowrap;
}

.page-faq .faq-item__q {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-faq .faq-item__summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--gray-600);
  border-bottom: 2px solid var(--gray-600);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease-out), border-color 200ms var(--ease-out);
}

.page-faq .faq-item[open] .faq-item__summary::after {
  transform: rotate(-135deg);
  border-color: var(--orange-500);
}

.page-faq .faq-item__body {
  padding: 0 1.1rem 1.2rem;
}

/* ---------- 三步解答 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 0.7rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-step__key {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.08em;
  color: var(--teal-800);
  padding-top: 0.12rem;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.72;
  color: var(--text);
  max-width: 62ch;
}

.page-faq .faq-step a {
  color: var(--tech-blue-500);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---------- 下载区双列 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-split__aside {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.page-faq .faq-versionmap {
  margin: 0;
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--teal-800);
}

.page-faq .faq-versionmap img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .faq-aside-note {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-faq .faq-aside-note a {
  color: var(--tech-blue-500);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 词表 ---------- */
.page-faq .faq-glossary {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid rgba(11, 27, 43, 0.18);
}

.page-faq .faq-glossary__row {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid rgba(11, 27, 43, 0.14);
}

.page-faq .faq-glossary dt {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--wine-700);
}

.page-faq .faq-glossary dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ink-900);
  max-width: 62ch;
}

.page-faq .faq-glossary__foot {
  margin: 1.25rem 0 0;
  font-size: var(--fs-meta);
  letter-spacing: 0.04em;
  color: var(--gray-600);
}

.page-faq .faq-glossary__foot a {
  color: var(--tech-blue-500);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-faq .faq-cta__title {
  max-width: 22ch;
}

.page-faq .faq-cta__lede {
  margin: 1rem 0 0;
  max-width: 56ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.8);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

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

.page-faq .faq-checklist__item {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-faq .faq-checklist__num {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.1em;
  color: var(--orange-500);
}

.page-faq .faq-checklist__text {
  font-size: 0.9688rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
}

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

  .page-faq .faq-item__body {
    padding-left: calc(1.1rem + var(--faq-code-col));
  }

  .page-faq .faq-glossary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2.75rem;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 17rem;
    align-items: end;
  }

  .page-faq .faq-hero__side {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 1.25rem;
    align-items: stretch;
  }

  .page-faq .faq-hero__vnote {
    writing-mode: vertical-rl;
    text-orientation: upright;
    margin: 0;
    letter-spacing: 0.28em;
    line-height: 1;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 18rem;
    align-items: start;
  }

  .page-faq .faq-cta__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-symptoms {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-symptom,
  .page-faq .faq-item__summary::after,
  .page-faq .faq-item {
    transition: none;
  }

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

.page-faq .faq-media,
.page-faq img {
  max-width: 100%;
  height: auto;
}
</main>