.page-faq {
  --faq-hair: rgba(201, 212, 226, 0.16);
  --faq-hair-strong: rgba(201, 212, 226, 0.34);
  --faq-body: rgba(244, 241, 234, 0.8);
  background: var(--c-space);
  color: var(--c-paper);
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(56px, 9vw, 108px);
}

.page-faq .faq-hero {
  padding-bottom: clamp(30px, 5vw, 54px);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-hero .eyebrow {
  color: var(--c-teal);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.75rem;
  margin: 0 0 14px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 20ch;
  color: var(--c-paper);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--faq-body);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--faq-hair);
}

.page-faq .faq-hero__meta .mono {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-tianshan);
}

/* 索引区 */
.page-faq .faq-index {
  padding-block: clamp(32px, 5vw, 56px);
}

.page-faq .faq-index__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.6vw, 1.5rem);
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--c-paper);
}

.page-faq .faq-index__figure {
  margin: 0 0 20px;
}

.page-faq .faq-index__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--faq-hair);
  background: var(--c-night);
}

.page-faq .faq-index__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-faq .faq-index__grid > li {
  display: flex;
}

.page-faq .faq-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  padding: 16px 16px 20px;
  background: var(--c-night);
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color 140ms var(--ease), transform 180ms var(--ease);
}

.page-faq .faq-card::after {
  content: "→";
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--c-mist);
  transition: color 140ms var(--ease), transform 180ms var(--ease);
}

.page-faq .faq-card:hover,
.page-faq .faq-card:focus-visible {
  border-color: var(--c-teal);
  transform: translateY(-2px);
  outline: none;
}

.page-faq .faq-card:hover::after,
.page-faq .faq-card:focus-visible::after {
  color: var(--c-elec);
  transform: translateX(2px);
}

.page-faq .faq-card__num {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-teal);
}

.page-faq .faq-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1875rem;
  line-height: 1.2;
  color: var(--c-paper);
}

.page-faq .faq-card__desc {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--c-mist);
  padding-right: 18px;
}

/* 章节 */
.page-faq .faq-chapter {
  padding-block: clamp(34px, 5.5vw, 62px);
  border-top: 1px solid var(--faq-hair);
  scroll-margin-top: 88px;
}

.page-faq .faq-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--c-teal);
}

.page-faq .faq-chapter__num {
  flex: none;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  color: var(--c-teal);
}

.page-faq .faq-chapter h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4375rem, 3.4vw, 2.125rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--c-paper);
}

.page-faq .faq-chapter__lead {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--faq-body);
}

.page-faq .faq-chapter__lead--tight {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--faq-hair);
  font-size: 0.9375rem;
}

.page-faq .faq-chapter__lead a {
  color: var(--c-elec);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 243, 228, 0.4);
  transition: border-color 140ms var(--ease), color 140ms var(--ease);
}

.page-faq .faq-chapter__lead a:hover,
.page-faq .faq-chapter__lead a:focus-visible {
  color: var(--c-teal);
  border-bottom-color: var(--c-teal);
}

/* 步骤链 */
.page-faq .faq-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-faq .faq-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 24px;
}

.page-faq .faq-step:last-child {
  padding-bottom: 0;
}

.page-faq .faq-step:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 42px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--faq-hair-strong), rgba(201, 212, 226, 0.04));
}

.page-faq .faq-step__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--c-teal);
  border-radius: 50%;
  background: var(--c-space);
  color: var(--c-teal);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.page-faq .faq-step__body h3 {
  margin: 8px 0 6px;
  font-size: 1.0313rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-faq .faq-step__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .faq-step__body a {
  color: var(--c-elec);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 243, 228, 0.4);
}

.page-faq .faq-step__body a:hover,
.page-faq .faq-step__body a:focus-visible {
  color: var(--c-teal);
  border-bottom-color: var(--c-teal);
}

/* 双栏：文字 + 图 */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: 26px;
}

.page-faq .faq-split .faq-steps {
  margin-top: 0;
}

.page-faq .faq-figure {
  margin: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--faq-hair);
  background: var(--c-night);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

/* 检查项 */
.page-faq .faq-check {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-check > li {
  background: var(--c-night);
  padding: 18px 16px 20px;
  border-left: 2px solid transparent;
  transition: border-color 140ms var(--ease);
}

.page-faq .faq-check > li:hover {
  border-left-color: var(--c-teal);
}

.page-faq .faq-check__k {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-amber);
  margin-bottom: 8px;
}

.page-faq .faq-check h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-faq .faq-check p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--faq-body);
}

/* 折叠问答 */
.page-faq .faq-q {
  margin-top: 18px;
  background: var(--c-night);
  border: 1px solid var(--faq-hair);
  border-left: 2px solid var(--faq-hair-strong);
  transition: border-left-color 140ms var(--ease);
}

.page-faq .faq-q[open] {
  border-left-color: var(--c-teal);
}

.page-faq .faq-q summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 0.9688rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-paper);
}

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

.page-faq .faq-q summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  line-height: 1;
  color: var(--c-teal);
}

.page-faq .faq-q[open] summary::after {
  content: "−";
}

.page-faq .faq-q summary:focus-visible {
  outline: 1px solid var(--c-teal);
  outline-offset: -2px;
}

.page-faq .faq-q__body {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--faq-hair);
  padding-top: 14px;
}

.page-faq .faq-q__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .faq-q__body a {
  color: var(--c-elec);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 243, 228, 0.4);
}

.page-faq .faq-q__body a:hover,
.page-faq .faq-q__body a:focus-visible {
  color: var(--c-teal);
  border-bottom-color: var(--c-teal);
}

/* 版本与备案标签块 */
.page-faq .faq-codes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-code {
  background: var(--c-night);
  border: 1px solid var(--faq-hair);
  border-left: 2px solid var(--c-amber);
  padding: 14px 16px 16px;
}

.page-faq .faq-code__k {
  display: block;
  margin-bottom: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-tianshan);
}

.page-faq .faq-code .copy-wrap {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-code__note {
  margin: 10px 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* 邮件结构 */
.page-faq .faq-mail-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-mail-list > li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px 16px;
  background: var(--c-night);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-body);
}

.page-faq .faq-mail-list .mono {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-teal);
  padding-top: 4px;
}

/* CTA */
.page-faq .faq-cta {
  margin: 26px 0 0;
}

.page-faq .faq-cta .btn--primary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 12px 24px;
}

/* 断点 */
@media (min-width: 560px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

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

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

  .page-faq .faq-step__body p,
  .page-faq .faq-chapter__lead {
    font-size: 1rem;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-chapter__head {
    padding-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card,
  .page-faq .faq-card::after,
  .page-faq .faq-q,
  .page-faq .faq-check > li {
    transition: none;
  }

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