.page-faq {
  --faq-radius: 24px 8px 24px 8px;
  --faq-radius-sm: 16px 6px 16px 6px;
  --faq-gap: clamp(20px, 3.2vw, 40px);
  background: var(--abyss-950);
  color: var(--mist-100);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .page-head {
  padding-top: clamp(20px, 3vw, 32px);
  padding-bottom: clamp(28px, 4vw, 48px);
  max-width: 920px;
}

.page-faq .page-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 5.2vw, 52px);
  line-height: 1.18;
  margin: 14px 0 18px;
  color: var(--mist-100);
}

.page-faq .page-head__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  max-width: 68ch;
  color: var(--text-soft);
}

/* ============ 分类跳转 ============ */
.page-faq .faq-nav-section {
  padding-top: 0;
}

.page-faq .faq-nav__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 4px 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-faq .faq-nav__item {
  flex: none;
  scroll-snap-align: start;
}

.page-faq .faq-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: var(--hairline);
  border-radius: var(--radius-chip);
  background: var(--abyss-800);
  color: var(--mist-100);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur-hover), border-color var(--dur-hover), transform var(--dur-hover);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  background: var(--abyss-600);
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-faq .faq-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-400);
  letter-spacing: 0.04em;
}

/* ============ 章节骨架 ============ */
.page-faq .faq-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-chapter__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.24;
  margin: 12px 0 16px;
}

.page-faq .faq-chapter__intro {
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
  color: var(--text-soft);
  margin-bottom: 28px;
}

.page-faq .section--light .faq-chapter__title,
.page-faq .section--light .faq-chapter__intro,
.page-faq .section--light .faq-answer-panel__title,
.page-faq .section--light .faq-checklist__title {
  color: var(--ink-900);
}

.page-faq .section--light .faq-chapter__intro {
  color: rgba(10, 22, 32, 0.72);
}

/* ============ 步骤 ============ */
.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: faqstep;
}

.page-faq .faq-steps__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 20px 22px;
  border-radius: var(--faq-radius);
  background: var(--abyss-800);
  border-left: 3px solid var(--cyan-400);
}

.page-faq .faq-steps__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px 4px 12px 4px;
  background: rgba(43, 240, 208, 0.14);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.page-faq .faq-steps__text h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.5;
  margin: 6px 0 8px;
  color: var(--mist-100);
}

.page-faq .faq-steps__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 60ch;
}

/* ============ 线路切换示意 ============ */
.page-faq .faq-lineflow {
  padding: 22px 20px 18px;
  border-radius: var(--faq-radius);
  border: var(--hairline-cyan);
  background: linear-gradient(140deg, rgba(14, 51, 80, 0.75), rgba(3, 15, 26, 0.4));
}

.page-faq .faq-lineflow__cap {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

.page-faq .faq-lineflow__svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 52px;
}

.page-faq .faq-lineflow__labels {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin: 10px 0 0;
}

.page-faq .faq-lineflow__label {
  flex: 1;
  text-align: center;
}

.page-faq .faq-lineflow__label dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  color: var(--cyan-200);
}

.page-faq .faq-lineflow__label dd {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--text-dim);
}

/* ============ 图 ============ */
.page-faq .faq-media {
  margin: 0;
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-radius);
  object-fit: cover;
  border: var(--hairline);
}

.page-faq .faq-media--square img {
  aspect-ratio: 1 / 1;
}

.page-faq .faq-media__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ============ 症状卡 ============ */
.page-faq .faq-symptoms {
  display: grid;
  gap: 14px;
  margin-bottom: 22px;
}

.page-faq .faq-symptom {
  padding: 20px 22px;
  border-radius: var(--faq-radius-sm);
  background: var(--paper-050);
  border-left: 3px solid var(--line-400);
}

.page-faq .faq-symptom__tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-500);
}

.page-faq .faq-symptom__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.5;
  margin: 0 0 8px;
  color: var(--ink-900);
}

.page-faq .faq-symptom p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(10, 22, 32, 0.74);
}

/* ============ 提示条 ============ */
.page-faq .faq-callout {
  margin: 24px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--orange-500);
  border-radius: 0 var(--faq-radius-sm) var(--faq-radius-sm) 0;
  background: rgba(255, 90, 44, 0.08);
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist-100);
  max-width: 66ch;
}

.page-faq .faq-callout--light {
  background: var(--paper-050);
  color: var(--ink-900);
  border-left-color: var(--orange-500);
  max-width: 72ch;
}

/* ============ 版本区块 ============ */
.page-faq .faq-version-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 8px;
}

.page-faq .faq-answer-panel {
  padding: 24px 24px 22px;
  border-radius: var(--faq-radius);
  background: var(--abyss-800);
  border: var(--hairline);
}

.page-faq .faq-answer-panel--accent {
  border-color: rgba(255, 154, 107, 0.5);
  background: linear-gradient(150deg, rgba(14, 51, 80, 0.9), rgba(7, 31, 51, 0.85));
}

.page-faq .faq-answer-panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.5;
  margin: 0 0 14px;
  color: var(--mist-100);
}

.page-faq .faq-answer-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-faq .faq-plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-plain-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-soft);
}

.page-faq .faq-plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan-400);
}

/* ============ 折叠问答 ============ */
.page-faq .faq-faqs {
  display: grid;
  gap: 12px;
  margin-top: 6px;
}

.page-faq .faq-answer {
  border-radius: var(--faq-radius-sm);
  background: var(--paper-050);
  border: 1px solid rgba(78, 113, 134, 0.28);
  overflow: hidden;
  transition: border-color var(--dur-hover), box-shadow var(--dur-hover);
}

.page-faq .faq-answer[open] {
  border-color: rgba(43, 240, 208, 0.55);
  box-shadow: 0 0 0 1px rgba(43, 240, 208, 0.12);
}

.page-faq .faq-answer__row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  background: transparent;
}

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

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

.page-faq .faq-answer__q {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-900);
}

.page-faq .faq-answer__row::after {
  content: "";
  flex: none;
  margin-left: auto;
  margin-top: 6px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--line-400);
  border-bottom: 2px solid var(--line-400);
  border-radius: 0 0 3px 0;
  transform: rotate(45deg);
  transition: transform var(--dur-hover), border-color var(--dur-hover);
}

.page-faq .faq-answer[open] > .faq-answer__row::after {
  transform: rotate(225deg);
  border-color: var(--orange-500);
}

.page-faq .faq-answer__row:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: -2px;
}

.page-faq .faq-answer__body {
  padding: 0 20px 20px 20px;
  border-top: 1px solid rgba(78, 113, 134, 0.22);
  margin-top: 0;
  padding-top: 16px;
}

.page-faq .faq-answer__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(10, 22, 32, 0.78);
  max-width: 66ch;
}

/* ============ 自检清单 ============ */
.page-faq .faq-checklist {
  margin-top: 28px;
  padding: 24px 24px 20px;
  border-radius: var(--faq-radius);
  background: linear-gradient(140deg, rgba(168, 247, 232, 0.4), rgba(244, 250, 252, 0.9));
  border: 1px solid rgba(43, 240, 208, 0.4);
}

.page-faq .faq-checklist__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  margin: 0 0 14px;
  color: var(--ink-900);
}

.page-faq .faq-checklist__list {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 10px;
}

.page-faq .faq-checklist__list li {
  font-size: 15px;
  line-height: 1.82;
  color: rgba(10, 22, 32, 0.8);
}

.page-faq .faq-checklist__list li::marker {
  font-family: var(--font-mono);
  color: var(--orange-500);
  font-weight: 700;
}

/* ============ 联系区块 ============ */
.page-faq .faq-chapter--contact .faq-chapter__intro {
  margin-bottom: 24px;
}

.page-faq .faq-contact {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-faq .faq-contact__block {
  padding: 22px 22px 20px;
  border-radius: var(--faq-radius);
  background: var(--abyss-800);
  border-top: 1px solid rgba(43, 240, 208, 0.28);
}

.page-faq .faq-contact__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-faq .faq-contact__value {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--mist-100);
  word-break: break-word;
}

.page-faq .faq-contact__value--mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-faq .faq-contact__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-contact__links {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-faq .faq-contact__links a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--dur-hover);
}

.page-faq .faq-contact__links a:hover,
.page-faq .faq-contact__links a:focus-visible {
  color: var(--cyan-200);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-faq .faq-version-grid {
    grid-template-columns: 1.35fr 1fr;
  }

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

@media (min-width: 960px) {
  .page-faq .faq-chapter__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-chapter__grid--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-faq .faq-chapter__grid--reverse .faq-chapter__body {
    order: 2;
  }

  .page-faq .faq-chapter__grid--reverse .faq-media {
    order: 1;
  }

  .page-faq .faq-media--square img {
    max-height: 420px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-chapter__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-chapter__grid--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-nav__link,
  .page-faq .faq-answer,
  .page-faq .faq-answer__row::after {
    transition: none;
  }

  .page-faq .faq-nav__link:hover {
    transform: none;
  }
}