.page-faq {
  --faq-rail-w: 280px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(28px, 4vw, 52px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(201, 242, 77, 0.07), transparent 62%),
    linear-gradient(180deg, var(--c-deep), var(--c-ink));
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(28px, 5vw, 58px);
  line-height: 1.12;
  color: var(--c-white);
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  max-width: 62ch;
  color: var(--c-cream);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

/* 首屏数据条 */
.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-faq .faq-fact {
  background: var(--c-ink);
  padding: 16px 18px 18px;
}

.page-faq .faq-fact dt {
  margin: 0;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-slate);
}

.page-faq .faq-fact dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-lime);
}

.page-faq .faq-fact-unit {
  font-size: 0.4em;
  margin-left: 5px;
  letter-spacing: 0;
  color: var(--c-slate);
  font-weight: 600;
}

.page-faq .faq-hero-media {
  margin: clamp(28px, 4.5vw, 52px) 0 0;
}

/* ---------- 主布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  padding-top: clamp(36px, 5.5vw, 72px);
  padding-bottom: clamp(72px, 10vw, 160px);
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 84px);
    align-items: start;
  }
}

/* ---------- 左侧问题索引 ---------- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-slate);
  border-bottom: 1px solid var(--c-line);
  position: relative;
}

.page-faq .faq-rail-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 42px;
  height: 1px;
  background: var(--c-lime);
}

.page-faq .faq-axis {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  border-bottom: 1px solid var(--c-line);
}

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

.page-faq .faq-axis .axis-item {
  flex: 0 0 auto;
  margin: 0;
}

.page-faq .faq-axis .axis-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 11px 16px 11px 0;
  white-space: nowrap;
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-slate);
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-axis .axis-link:hover {
  color: var(--c-white);
}

.page-faq .faq-axis .axis-link.is-active {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-faq .faq-axis-no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-amber);
}

.page-faq .faq-axis .axis-link.is-active .faq-axis-no {
  color: var(--c-lime);
}

@media (min-width: 980px) {
  .page-faq .faq-rail-inner {
    position: sticky;
    top: calc(var(--hdr-h-condensed) + 28px);
  }

  .page-faq .faq-axis {
    flex-direction: column;
    overflow: visible;
    border-bottom: 0;
  }

  .page-faq .faq-axis .axis-item {
    flex: 1 1 auto;
    width: 100%;
  }

  .page-faq .faq-axis .axis-link {
    padding: 12px 14px 12px 14px;
    white-space: normal;
    font-size: 14px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-faq .faq-axis .axis-link.is-active {
    border-left-color: var(--c-lime);
    background: linear-gradient(90deg, rgba(201, 242, 77, 0.09), transparent 72%);
  }
}

/* ---------- 分组 ---------- */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--hdr-h-condensed) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6.5vw, 88px);
  padding-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-group-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2vw, 26px);
  margin-bottom: clamp(16px, 2.2vw, 24px);
}

.page-faq .faq-group-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 4.6vw, 54px);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--c-lime);
  margin-top: 3px;
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.22;
  color: var(--c-white);
}

.page-faq .faq-group-lede {
  margin: 9px 0 0;
  max-width: 58ch;
  color: var(--c-slate);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 答案块 ---------- */
.page-faq .faq-items {
  border-top: 1px solid var(--c-line);
}

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

.page-faq .qa-sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--c-white);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa-sum::marker {
  content: "";
}

.page-faq .qa-sum:hover {
  color: var(--c-amber);
}

.page-faq .qa-sum:focus-visible {
  outline: 2px solid var(--c-lime);
  outline-offset: 3px;
}

.page-faq .qa-q {
  flex: 1 1 auto;
}

.page-faq .qa-toggle {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-line);
  color: var(--c-slate);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .qa-toggle::before {
  content: "+";
}

.page-faq .qa[open] .qa-toggle::before {
  content: "−";
}

.page-faq .qa[open] .qa-toggle {
  color: var(--c-lime);
  border-color: rgba(201, 242, 77, 0.42);
}

.page-faq .qa-body {
  padding-bottom: clamp(18px, 2.4vw, 26px);
}

.page-faq .qa-conclusion {
  margin: 0 0 11px;
  padding-left: 14px;
  border-left: 3px solid var(--c-amber);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.6;
  color: var(--c-white);
}

.page-faq .qa-text {
  margin: 0;
  padding-left: 17px;
  max-width: 66ch;
  color: var(--c-cream);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 口径分组：答案 + 示意图 ---------- */
.page-faq .faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
  align-items: start;
}

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

@media (min-width: 1200px) {
  .page-faq .faq-grid {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 330px);
    gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 咨询区 ---------- */
.page-faq .faq-contact {
  margin-top: clamp(24px, 3.5vw, 38px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--c-deep);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-lime);
}

.page-faq .faq-contact-label {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

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

.page-faq .faq-contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-contact-list li:last-child {
  border-bottom: 0;
}

.page-faq .faq-contact-list span {
  flex: 0 0 auto;
  min-width: 5.5em;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-slate);
}

.page-faq .faq-contact-list b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-faq .faq-contact-list b.is-address {
  font-family: var(--font-body);
  letter-spacing: 0.01em;
}

.page-faq .faq-contact-btn {
  margin-top: clamp(18px, 2.4vw, 26px);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 640px) {
  .page-faq .faq-group-head {
    gap: 12px;
  }

  .page-faq .faq-group-no {
    margin-top: 4px;
  }

  .page-faq .faq-fact {
    padding: 14px 16px 16px;
  }

  .page-faq .qa-conclusion {
    padding-left: 12px;
    border-left-width: 2px;
  }

  .page-faq .qa-text {
    padding-left: 14px;
    font-size: 15.5px;
  }
}