.page-faq {
  --faq-sticky-top: 80px;
  --faq-line: var(--line-light);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background: var(--ink-900);
  background-image:
    linear-gradient(90deg, rgba(34, 48, 63, .55) 1px, transparent 1px),
    linear-gradient(180deg, rgba(34, 48, 63, .4) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  color: var(--paper);
  padding: clamp(56px, 10vw, 104px) 0 clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--line-dark);
}

.page-faq .faq-crumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-faq .faq-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--ink-muted);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--cyan);
}

.page-faq .faq-hero .breadcrumb li {
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: .05em;
  max-width: 18ch;
  color: #fff;
}

.page-faq .faq-hero .lead {
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--ink-text);
  margin: 0;
}

.page-faq .faq-hero__meta {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-hero__meta .num-chip {
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
  color: var(--ink-text);
  padding: 7px 12px;
  font-size: 12px;
  letter-spacing: -.01em;
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  background: var(--paper);
  color: var(--text);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* 分组快速定位轴 */
.page-faq .faq-axis-bar {
  position: sticky;
  top: var(--faq-sticky-top);
  z-index: 30;
  background: rgba(246, 247, 249, .95);
  border-bottom: 1px solid var(--faq-line);
  padding: 10px 0;
}

.page-faq .faq-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-axis::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-axis__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--faq-line);
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.page-faq .faq-axis__item:hover,
.page-faq .faq-axis__item:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan-deep);
  box-shadow: inset 3px 0 0 var(--cyan);
  outline: none;
}

.page-faq .faq-axis__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan-deep);
  letter-spacing: -.01em;
}

/* 结构示意 */
.page-faq .faq-visual {
  margin: clamp(24px, 4vw, 40px) 0 clamp(8px, 2vw, 16px);
  border: 1px solid var(--faq-line);
  background: var(--card);
}

.page-faq .faq-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 分组 ---------- */
.page-faq .faq-groups {
  padding-top: clamp(24px, 4vw, 40px);
}

.page-faq .faq-group {
  padding: clamp(28px, 5vw, 52px) 0;
  border-top: 1px solid var(--faq-line);
  scroll-margin-top: calc(var(--faq-sticky-top) + 72px);
}

.page-faq .faq-group:first-child {
  border-top: 0;
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-deep);
  padding-top: 4px;
  flex: 0 0 auto;
}

.page-faq .faq-group__intro h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 27px);
  letter-spacing: .04em;
  line-height: 1.3;
  color: var(--text);
}

.page-faq .faq-group__intro p {
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 问答条目 */
.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .qa {
  background: var(--card);
  border: 1px solid var(--faq-line);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-mid) var(--ease);
}

.page-faq .qa[open] {
  border-color: var(--cyan);
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 2vw, 16.5px);
  line-height: 1.6;
  letter-spacing: .01em;
  color: var(--text);
  transition: color var(--dur-fast) var(--ease);
}

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

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

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
  color: var(--cyan-deep);
}

.page-faq .qa__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cyan-deep);
  padding-top: 2px;
}

.page-faq .qa__text {
  flex: 1 1 auto;
}

.page-faq .qa__a {
  padding: 0 18px 18px 46px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa__a a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover {
  color: var(--orange);
}

/* ---------- 反馈通道 ---------- */
.page-faq .faq-feedback {
  background: var(--ink-900);
  color: var(--paper);
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-feedback__head {
  max-width: 68ch;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .faq-feedback__head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.3;
  letter-spacing: .04em;
  color: #fff;
}

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

.page-faq .faq-feedback__grid {
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-faq .faq-feedback__figure {
  margin: 0;
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
}

.page-faq .faq-feedback__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-feedback__panel {
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
  padding: clamp(20px, 3vw, 28px);
}

.page-faq .faq-feedback__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-faq .faq-contact__item {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line-dark);
}

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

.page-faq .faq-contact__key {
  flex: 0 0 auto;
  min-width: 72px;
  font-size: 13px;
  color: var(--ink-muted);
}

.page-faq .faq-contact__val {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-contact__val.mono {
  font-family: var(--font-mono);
  letter-spacing: -.01em;
}

.page-faq .faq-feedback .note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-text);
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
}

.page-faq .faq-feedback .note__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
  margin-bottom: 4px;
}

/* ---------- 末尾动作 ---------- */
.page-faq .faq-cta {
  background: var(--paper);
}

.page-faq .faq-cta__box {
  display: flex;
  flex-direction: column;
  gap: 24px;
  border: 1px solid var(--faq-line);
  border-left: 4px solid var(--orange);
  background: var(--card);
  padding: clamp(24px, 4vw, 40px);
}

.page-faq .faq-cta__text h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 27px);
  letter-spacing: .04em;
  line-height: 1.3;
  color: var(--text);
}

.page-faq .faq-cta__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-cta__text a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-cta__text a:hover {
  color: var(--orange);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-group {
    display: grid;
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-group:first-child {
    padding-top: clamp(24px, 3vw, 36px);
  }

  .page-faq .faq-group__head {
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--faq-sticky-top) + 88px);
  }

  .page-faq .faq-cta__box {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
  }

  .page-faq .faq-cta__actions {
    flex: 0 0 auto;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-hero__meta {
    gap: 12px;
  }

  .page-faq .faq-axis {
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .faq-axis__item {
    transition: none;
  }
}