.page-faq {
  --faq-rail-w: 232px;
  --faq-soft: rgba(245, 248, 251, 0.68);
  --faq-hair: rgba(154, 167, 180, 0.2);
  font-family: var(--font-body);
  color: var(--white);
  background: var(--navy);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  border-bottom: 1px solid var(--faq-hair);
  background: var(--char);
  padding: 12px 0;
}

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-faq .breadcrumb-item {
  color: var(--grey);
}

.page-faq .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-faq .breadcrumb-link {
  color: var(--faq-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .breadcrumb-link:hover,
.page-faq .breadcrumb-link:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 52px 0 56px;
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(245, 248, 251, 0.035) 0 1px, transparent 1px 96px),
    linear-gradient(180deg, var(--char) 0%, var(--navy) 100%);
}

.page-faq .faq-hero-inner {
  display: grid;
  gap: 44px;
}

.page-faq .faq-kicker {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-faq .faq-hero-title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6.4vw, 60px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-lede {
  margin: 0 0 30px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--faq-soft);
}

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

.page-faq .faq-hero-board {
  align-self: end;
  border: 1px solid var(--line);
  border-top: 2px solid var(--green);
  background: rgba(16, 38, 61, 0.72);
  padding: 4px 22px 8px;
}

.page-faq .faq-board-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-board-row:last-child {
  border-bottom: 0;
}

.page-faq .faq-board-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.01em;
}

.page-faq .faq-board-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--faq-soft);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-layout {
  padding-top: 56px;
  padding-bottom: 80px;
}

.page-faq .faq-rail {
  margin-bottom: 36px;
}

.page-faq .faq-rail-inner {
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.page-faq .faq-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-faq .faq-rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--faq-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--amber);
}

.page-faq .faq-rail-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--grey);
}

.page-faq .faq-rail-link:hover .faq-rail-no,
.page-faq .faq-rail-link:focus-visible .faq-rail-no {
  color: var(--amber);
}

/* ---------- 区块 ---------- */
.page-faq .faq-block {
  padding-bottom: 52px;
  margin-bottom: 52px;
  border-bottom: 1px solid var(--faq-hair);
  scroll-margin-top: 108px;
}

.page-faq .faq-block--last {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-block-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 26px;
}

.page-faq .faq-block-index {
  flex: none;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-faq .faq-block-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-block-note {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 折叠问答 ---------- */
.page-faq .accordion {
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .accordion-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  width: 100%;
  padding: 22px 4px;
  border: 0;
  background: none;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease);
}

.page-faq .accordion-trigger:hover {
  color: var(--green);
}

.page-faq .accordion-trigger:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-faq .q-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--grey);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .accordion-trigger[aria-expanded="true"] .q-no {
  color: var(--green);
}

.page-faq .q-sign {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}

.page-faq .q-sign::before,
.page-faq .q-sign::after {
  content: "";
  position: absolute;
  background: var(--amber);
  transition: transform var(--t-base) var(--ease), background-color var(--t-base) var(--ease);
}

.page-faq .q-sign::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .q-sign::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .accordion-trigger[aria-expanded="true"] .q-sign::before {
  background: var(--green);
}

.page-faq .accordion-trigger[aria-expanded="true"] .q-sign::after {
  transform: scaleY(0);
}

.page-faq .accordion-panel {
  padding: 0 4px 26px 48px;
  border-left: 1px solid transparent;
}

.page-faq .accordion-panel[hidden] {
  display: none;
}

.page-faq .accordion-panel:not([hidden]) {
  animation: faq-open var(--t-block) var(--ease) both;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .accordion-panel p {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-soft);
}

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

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 30px;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--char);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(245, 248, 251, 0.08);
}

.page-faq .faq-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--grey);
}

.page-faq .faq-errata {
  display: grid;
  gap: 32px;
}

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

/* ---------- 勘误步骤 ---------- */
.page-faq .faq-steps .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-faq .faq-steps .tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--faq-soft);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-steps .tab-btn:hover {
  color: var(--white);
  border-color: var(--amber);
}

.page-faq .faq-steps .tab-btn:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-faq .faq-steps .tab-btn[aria-selected="true"] {
  color: var(--white);
  border-color: var(--green);
  background: rgba(62, 240, 140, 0.08);
}

.page-faq .faq-step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-steps .tab-btn[aria-selected="true"] .faq-step-num {
  color: var(--green);
}

.page-faq .faq-step-panels {
  border-left: 2px solid var(--green);
  padding-left: 20px;
}

.page-faq .faq-steps .tab-panel {
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-soft);
}

.page-faq .faq-steps .tab-panel[hidden] {
  display: none;
}

.page-faq .faq-steps .tab-panel p {
  margin: 0;
  max-width: 62ch;
}

.page-faq .faq-steps .tab-panel:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 4px;
}

/* ---------- 联系 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 20px;
}

.page-faq .faq-contact-card {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  background: rgba(16, 38, 61, 0.7);
}

.page-faq .faq-contact-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grey);
}

.page-faq .faq-contact-value {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--white);
  word-break: break-all;
}

.page-faq .faq-contact-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--faq-soft);
}

.page-faq .faq-closing {
  margin: 28px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--faq-soft);
}

.page-faq .faq-closing a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 240, 140, 0.42);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-closing a:hover,
.page-faq .faq-closing a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-faq .accordion-trigger {
    gap: 12px;
    padding: 18px 2px;
    font-size: 16px;
  }

  .page-faq .accordion-panel {
    padding: 0 2px 22px;
  }

  .page-faq .faq-block-head {
    gap: 12px;
  }

  .page-faq .faq-board-num {
    font-size: 22px;
  }

  .page-faq .faq-contact-value {
    font-size: 16px;
  }
}

@media (min-width: 768px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 68px 0 76px;
  }

  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(288px, 0.65fr);
    align-items: end;
    gap: 64px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    column-gap: 64px;
    align-items: start;
    padding-top: 68px;
    padding-bottom: 96px;
  }

  .page-faq .faq-rail {
    margin-bottom: 0;
  }

  .page-faq .faq-rail-inner {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-errata {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 44px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .accordion-panel:not([hidden]) {
    animation: none;
  }

  .page-faq .q-sign::before,
  .page-faq .q-sign::after,
  .page-faq .accordion-trigger,
  .page-faq .faq-rail-link,
  .page-faq .breadcrumb-link,
  .page-faq .faq-steps .tab-btn,
  .page-faq .faq-closing a {
    transition-duration: 1ms;
  }
}