.page-faq {
  --faq-rail-w: 208px;
  --faq-gutter: 24px;
  background-color: var(--ink);
  color: var(--ice);
  font-family: var(--sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 56px) 0 56px;
  background:
    radial-gradient(130% 110% at 10% 0%, rgba(23, 65, 74, 0.9) 0%, rgba(11, 27, 43, 0) 60%),
    var(--ink);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -150px;
  right: -120px;
  width: min(62vw, 640px);
  height: min(62vw, 640px);
  background: linear-gradient(135deg, var(--lime) 0%, rgba(184, 241, 74, 0) 72%);
  opacity: 0.13;
  clip-path: polygon(48% 0, 100% 0, 100% 52%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--hairline);
}

.page-faq .faq-hero .breadcrumb {
  position: relative;
}

.page-faq .faq-hero .section-label {
  position: relative;
  display: block;
  margin-top: 26px;
  color: var(--lime);
}

.page-faq .faq-hero h1 {
  position: relative;
  margin: 16px 0 0;
  max-width: 20ch;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 6.2vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-lede {
  position: relative;
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.86;
}

.page-faq .faq-quick {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--fog);
}

.page-faq .faq-quick li {
  position: relative;
  padding-left: 15px;
}

.page-faq .faq-quick li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  background: var(--lime);
  border-radius: 50%;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding: 40px 0 84px;
}

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

/* ---------- 索引列 ---------- */
.page-faq .faq-rail-title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--fog);
}

@media (max-width: 1099px) {
  .page-faq .faq-rail .index-rail-list {
    display: flex;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 10px;
    scrollbar-width: none;
  }

  .page-faq .faq-rail .index-rail-list::-webkit-scrollbar {
    display: none;
  }

  .page-faq .faq-rail .index-rail-link {
    white-space: nowrap;
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  padding: 4px 0 48px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-section + .faq-section {
  padding-top: 44px;
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-section h2 {
  margin: 12px 0 0;
  max-width: 24ch;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-faq .faq-intro {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.78;
}

.page-faq .faq-hint {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--teal);
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 分栏 ---------- */
.page-faq .faq-split {
  margin-top: 28px;
  align-items: start;
  gap: 28px;
}

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

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

/* ---------- 三步流程 ---------- */
.page-faq .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .step {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 0 0 26px 22px;
}

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

.page-faq .step::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(184, 241, 74, 0.55), rgba(184, 241, 74, 0));
}

.page-faq .step:last-child::before {
  display: none;
}

.page-faq .step-num {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--lime);
  transition: color 160ms ease;
}

.page-faq .step:hover .step-num {
  color: var(--paper);
}

.page-faq .step-body h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

.page-faq .step-body p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.8;
}

/* ---------- 问答 ---------- */
.page-faq .qa-list {
  margin-top: 26px;
  border-top: 1px solid var(--hairline);
}

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

.page-faq .qa-summary {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 20px;
  gap: 14px;
  align-items: start;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa-index {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
  letter-spacing: 0.06em;
  color: var(--fog);
  transition: color 160ms ease;
}

.page-faq .qa-question {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--ice);
  transition: color 160ms ease;
}

.page-faq .qa-summary:hover .qa-question,
.page-faq .qa[open] .qa-question {
  color: var(--paper);
}

.page-faq .qa[open] .qa-index {
  color: var(--lime);
}

.page-faq .qa-mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 7px;
  margin-left: auto;
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform 180ms ease, opacity 180ms ease;
}

.page-faq .qa-mark::before {
  left: 0;
  top: 6.5px;
  width: 14px;
  height: 1px;
}

.page-faq .qa-mark::after {
  left: 6.5px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-faq .qa[open] .qa-mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa-answer {
  padding: 0 0 24px 52px;
}

.page-faq .qa-answer p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.8;
}

/* ---------- 暖纸面板 ---------- */
.page-faq .faq-paper {
  padding: 24px 22px;
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-faq .faq-paper h3 {
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-faq .faq-paper h3:first-child {
  margin-top: 0;
}

.page-faq .faq-paper p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 排查对照 ---------- */
.page-faq .trouble {
  margin-top: 26px;
  border-top: 1px solid var(--hairline);
}

.page-faq .trouble-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-faq .trouble-q {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ice);
}

.page-faq .trouble-a {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.76;
}

/* ---------- 结尾指引 ---------- */
.page-faq .faq-cta {
  margin-top: 4px;
  padding: 26px 24px;
  background: linear-gradient(135deg, rgba(23, 65, 74, 0.92) 0%, rgba(30, 42, 56, 0.92) 100%);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}

.page-faq .faq-cta-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-cta-text {
  margin: 10px 0 20px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.8;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1100px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding: 60px 0 96px;
  }

  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 72px) 0 68px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-faq .faq-split--source .faq-split-text {
    padding-top: 4px;
  }

  .page-faq .trouble-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.45fr);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 720px) and (max-width: 1099px) {
  .page-faq .qa-answer {
    padding-left: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step-num,
  .page-faq .qa-question,
  .page-faq .qa-index,
  .page-faq .qa-mark::before,
  .page-faq .qa-mark::after {
    transition: none;
  }
}
</main>