.page-faq {
  background: var(--night);
  color: var(--fog);
  padding: clamp(20px, 3.4vw, 44px) 0 clamp(56px, 8vw, 104px);
  overflow-x: hidden;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
  font-size: 0.82rem;
  color: var(--sage);
}

.page-faq .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .guide-head {
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(22px, 3.6vw, 40px);
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

.page-faq .guide-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.72rem, 4.6vw, 3.25rem);
  line-height: 1.14;
  letter-spacing: 0.005em;
  margin: 14px 0 18px;
  max-width: 20em;
  color: var(--fog);
}

.page-faq .guide-head .page-head__lead {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.85;
  color: var(--fog);
  max-width: 34em;
  margin: 0 0 14px;
}

.page-faq .guide-head__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan);
  color: var(--sage);
  font-size: 0.92rem;
  line-height: 1.75;
  max-width: 36em;
}

/* ---------- 三步步骤条 ---------- */
.page-faq .guide-start {
  margin-bottom: clamp(32px, 5vw, 64px);
}

.page-faq .guide-start__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  color: var(--fog);
}

.page-faq .stepbar {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-faq .stepbar__item {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--grass);
  border: 1px solid var(--line);
  border-top: 1px dashed var(--line-cyan);
}

.page-faq .stepbar__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--panel);
  border: 1px solid var(--line-cyan);
  color: var(--cyan);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-faq .stepbar__heading {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  margin: 14px 0 8px;
  color: var(--fog);
}

.page-faq .stepbar__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--sage);
}

.page-faq .stepbar__text a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .stepbar__text a:hover,
.page-faq .stepbar__text a:focus-visible {
  border-bottom-color: var(--blue);
}

/* ---------- 主布局 ---------- */
.page-faq .guide-layout {
  display: grid;
  gap: 28px;
}

.page-faq .guide-nav {
  border: 1px solid var(--line);
  background: var(--abyss);
  padding: 18px 16px;
}

.page-faq .guide-nav__label {
  display: block;
  margin: 0 0 12px;
  color: var(--sage);
}

.page-faq .guide-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .guide-nav .chapter-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  color: var(--sage);
  text-decoration: none;
  font-size: 0.9rem;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .guide-nav .chapter-nav__num {
  color: var(--cyan);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

.page-faq .guide-nav .chapter-nav__link:hover,
.page-faq .guide-nav .chapter-nav__link:focus-visible {
  color: var(--fog);
  background: var(--grass);
}

.page-faq .guide-nav .chapter-nav__link[aria-current="true"] {
  color: var(--fog);
  border-left-color: var(--cyan);
  background: var(--grass);
}

/* ---------- 章节 ---------- */
.page-faq .guide-body {
  display: grid;
  gap: clamp(34px, 5vw, 62px);
  min-width: 0;
}

.page-faq .guide-block {
  scroll-margin-top: 110px;
  border-top: 1px solid var(--line);
  padding-top: clamp(20px, 3vw, 30px);
  min-width: 0;
}

.page-faq .guide-block .label {
  display: block;
  margin: 0 0 10px;
  color: var(--cyan);
}

.page-faq .guide-block__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.32rem, 2.9vw, 2.05rem);
  line-height: 1.22;
  margin: 0 0 14px;
  color: var(--fog);
}

.page-faq .guide-block__lead {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--sage);
  max-width: 34em;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-faq .guide-block__lead a,
.page-faq .guide-block__foot a,
.page-faq .qa__body a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .guide-block__lead a:hover,
.page-faq .guide-block__foot a:hover,
.page-faq .qa__body a:hover,
.page-faq .guide-block__lead a:focus-visible,
.page-faq .guide-block__foot a:focus-visible,
.page-faq .qa__body a:focus-visible {
  border-bottom-color: var(--blue);
}

.page-faq .guide-block__foot {
  margin: 22px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 手风琴 ---------- */
.page-faq .qa-stack {
  display: grid;
  gap: 10px;
}

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

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fog);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .qa > summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa > summary::before {
  content: "";
  flex: 0 0 3px;
  align-self: stretch;
  min-height: 22px;
  background: transparent;
  transition: background 0.2s var(--ease);
}

.page-faq .qa > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--sage);
  transition: color 0.2s var(--ease);
}

.page-faq .qa[open] > summary::before {
  background: var(--cyan);
}

.page-faq .qa[open] > summary::after {
  content: "–";
  color: var(--cyan);
}

.page-faq .qa > summary:hover,
.page-faq .qa > summary:focus-visible {
  background: var(--panel);
}

.page-faq .qa__body {
  padding: 0 18px 18px 34px;
  border-top: 1px solid var(--line-soft);
  margin-top: 2px;
}

.page-faq .qa__body p {
  margin: 14px 0 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--sage);
  max-width: 40em;
}

/* ---------- 术语表 ---------- */
.page-faq .term-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .term {
  background: var(--grass);
  padding: 16px 18px;
  transition: background 0.2s var(--ease);
}

.page-faq .term:hover {
  background: var(--panel);
}

.page-faq .term__name {
  display: inline-block;
  margin: 0 0 6px;
  padding: 3px 8px;
  border: 1px solid var(--line-cyan);
  color: var(--cyan);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
}

.page-faq .term__desc {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .term__eg {
  display: block;
  margin-top: 8px;
  padding-left: 12px;
  border-left: 2px solid var(--line-soft);
  color: var(--sage);
  font-size: 0.88rem;
  line-height: 1.75;
}

.page-faq .term:hover .term__eg {
  border-left-color: var(--orange);
  color: var(--fog);
}

/* ---------- 清单列义 ---------- */
.page-faq .spec-list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .spec-list__item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .spec-list__key {
  color: var(--amber);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
}

.page-faq .spec-list__val {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--sage);
}

.page-faq .guide-start__figure,
.page-faq .guide-list__figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-faq .guide-list__figure {
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 联系区 ---------- */
.page-faq .guide-block--help {
  background: var(--abyss);
  border: 1px solid var(--line-cyan);
  border-top-width: 1px;
  padding: clamp(20px, 3vw, 32px);
}

.page-faq .contact-rows {
  display: grid;
  gap: 12px;
  margin-bottom: 4px;
}

.page-faq .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 12px 14px;
  background: var(--grass);
  border: 1px solid var(--line);
}

.page-faq .contact-row__key {
  color: var(--sage);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  min-width: 44px;
}

.page-faq .contact-row__val {
  color: var(--fog);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  word-break: break-all;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .guide-head__title {
    transform: skewX(-6deg);
    transform-origin: left center;
    padding-left: 2px;
  }

  .page-faq .stepbar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .spec-list__item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 1024px) {
  .page-faq .guide-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 58px);
    align-items: start;
  }

  .page-faq .guide-nav {
    position: sticky;
    top: 104px;
  }

  .page-faq .qa > summary {
    font-size: 1.04rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: 0.01ms !important;
  }
}