.page-faq {
  --faq-rail: 304px;
  --faq-gap: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4vw, 40px) 0 clamp(28px, 5vw, 46px);
  background-image: var(--grad-soft);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  background: var(--grad-band);
  opacity: 0.8;
}

.page-faq .faq-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--c-mist);
  max-width: 20em;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(242, 243, 245, 0.78);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px 9px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(34, 38, 46, 0.72);
  color: var(--c-mist);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--c-red);
  color: var(--c-yellow);
  transform: translateY(-2px);
}

.page-faq .faq-jump__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--c-yellow);
  letter-spacing: 0.04em;
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  margin-top: clamp(34px, 6vw, 64px);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(44px, 7vw, 80px);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px 0 18px;
  border-top: 1px solid var(--line);
  margin-bottom: 18px;
}

.page-faq .faq-group__head::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 92px;
  height: 3px;
  background: var(--grad-band);
}

.page-faq .faq-group__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1;
  color: var(--c-yellow);
  padding: 4px 8px;
  border: 2px solid var(--c-red);
  box-shadow: 3px 3px 0 var(--c-red-deep);
  background: var(--c-graphite-2);
}

.page-faq .faq-group__intro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.32;
  color: var(--c-mist);
}

.page-faq .faq-group__intro p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-slate);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--c-graphite);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}

.page-faq .qa:hover {
  border-left-color: var(--c-red);
}

.page-faq .qa[open] {
  border-left-color: var(--c-yellow);
  border-color: var(--line-strong);
  background: var(--c-graphite-2);
  box-shadow: var(--shadow-card);
}

.page-faq .qa__q {
  position: relative;
  padding: 15px 46px 15px 17px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-mist);
  cursor: pointer;
  list-style: none;
  transition: color var(--t-fast);
}

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

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  color: var(--c-yellow);
}

.page-faq .qa[open] .qa__q {
  color: var(--c-yellow);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa__a {
  padding: 4px 18px 20px 17px;
  margin: 0 0 0 0;
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(242, 243, 245, 0.8);
}

.page-faq .qa__a p {
  margin: 0 0 10px;
}

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

.page-faq .qa__a a {
  color: var(--c-yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--t-fast);
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  color: var(--c-red);
}

/* ---------- 步骤列表 ---------- */
.page-faq .steps {
  counter-reset: faq-step;
  list-style: none;
  margin: 12px 0 12px;
  padding: 0;
}

.page-faq .steps li {
  counter-increment: faq-step;
  position: relative;
  padding-left: 42px;
  margin-bottom: 11px;
  line-height: 1.8;
}

.page-faq .steps li:last-child {
  margin-bottom: 0;
}

.page-faq .steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  background: var(--c-yellow);
  padding: 2px 6px;
  border-radius: var(--radius);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 0;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-graphite);
  padding: 12px;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--c-graphite-2);
  object-fit: cover;
}

.page-faq .faq-figure__caption {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ---------- 右侧栏 ---------- */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-side__panel {
  margin-bottom: 18px;
}

.page-faq .faq-side__panel:last-child {
  margin-bottom: 0;
}

.page-faq .faq-svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 14px;
}

.page-faq .faq-side__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-slate);
}

.page-faq .faq-links {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .faq-links li {
  border-top: 1px solid var(--line);
}

.page-faq .faq-links li:first-child {
  border-top: none;
}

.page-faq .faq-links a {
  display: block;
  padding: 12px 2px;
  font-size: 14.5px;
  color: rgba(242, 243, 245, 0.82);
  text-decoration: none;
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.page-faq .faq-links a:hover,
.page-faq .faq-links a:focus-visible {
  color: var(--c-yellow);
  padding-left: 6px;
}

/* ---------- 桌面栅格与吸顶 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) var(--faq-rail);
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (max-width: 620px) {
  .page-faq .qa__q {
    padding-right: 38px;
    font-size: 15.5px;
  }

  .page-faq .qa__a {
    font-size: 15px;
    padding-left: 14px;
    padding-right: 14px;
  }

  .page-faq .steps li {
    padding-left: 36px;
  }

  .page-faq .faq-group__num {
    box-shadow: 2px 2px 0 var(--c-red-deep);
  }
}