.page-faq {
  --faq-space: clamp(28px, 4.6vw, 56px);
  --faq-radius: 4px;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
  position: relative;
  z-index: 1;
}

.page-faq .crumb {
  color: var(--mist);
  text-decoration: none;
}

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

.page-faq .crumb[aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding-bottom: var(--faq-space);
  background: linear-gradient(180deg, rgba(14, 36, 56, .92), rgba(8, 24, 38, 1));
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(28, 59, 87, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 59, 87, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 92% at 50% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(120% 92% at 50% 0%, #000 18%, transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: 0 0 var(--faq-space);
  max-width: 64ch;
  font-size: clamp(15px, 2.1vw, 17px);
  color: var(--mist);
}

/* ---------- 入口速查 ---------- */
.page-faq .quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .quick {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 14px 14px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  text-decoration: none;
  color: var(--paper);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .quick::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), transparent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.page-faq .quick:hover,
.page-faq .quick:focus-visible {
  border-color: var(--signal);
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-faq .quick:hover::after,
.page-faq .quick:focus-visible::after {
  transform: scaleX(1);
}

.page-faq .quick__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--signal);
}

.page-faq .quick__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.2;
}

.page-faq .quick__desc {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-faq .quick__arrow {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-space);
  padding-top: var(--faq-space);
  padding-bottom: var(--faq-space);
}

.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-faq .faq-rail .anchor-nav {
  display: flex;
  flex-direction: row;
  gap: 6px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail .anchor-nav__link {
  flex: none;
  white-space: nowrap;
  padding: 7px 10px;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-rail .anchor-nav__link:hover {
  color: var(--paper);
}

.page-faq .faq-rail .anchor-nav__link[aria-current="true"] {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-faq .faq-rail__status {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-faq .faq-rail .status-chip {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
}

/* ---------- 区块骨架 ---------- */
.page-faq .faq-section {
  padding-bottom: clamp(30px, 4.6vw, 52px);
}

.page-faq .faq-section + .faq-section {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-faq .faq-section__head {
  margin-bottom: 20px;
}

.page-faq .faq-section__head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 34px);
  line-height: 1.16;
  color: var(--paper);
}

.page-faq .faq-section__head p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 筛选 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 16px;
  padding: 11px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
}

.page-faq .filter-btn {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.2;
  padding: 7px 13px;
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--paper);
  border-color: var(--mist);
}

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

.page-faq .filter-btn[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 700;
}

.page-faq .faq-filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-faq .faq-item {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item:not([open]):hover {
  border-color: var(--mist);
  border-left-color: var(--cyan);
}

.page-faq .faq-item[open] {
  border-left-color: var(--signal);
  background: var(--ink-700);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 14px 15px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "−";
  color: var(--signal);
}

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

.page-faq .faq-item__no {
  flex: none;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--mist);
}

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

.page-faq .faq-item__a {
  padding: 0 15px 17px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-faq .faq-item__a p {
  margin: 0 0 9px;
}

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

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

/* ---------- 图片 ---------- */
.page-faq .media {
  position: relative;
  margin: 0 0 20px;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
}

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

.page-faq .media__cap {
  padding: 9px 13px;
  border-top: 1px solid var(--line);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--mist);
}

/* ---------- 资料卡 ---------- */
.page-faq .dl-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 11px;
}

.page-faq .dl-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 15px 15px 13px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .dl-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .dl-card:hover,
.page-faq .dl-card:focus-within {
  border-color: var(--cyan);
  background: var(--ink-700);
}

.page-faq .dl-card:hover::before,
.page-faq .dl-card:focus-within::before {
  width: 100%;
  background: var(--signal);
}

.page-faq .dl-card__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .dl-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.26;
  color: var(--paper);
}

.page-faq .dl-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.58;
  color: var(--mist);
}

.page-faq .dl-card__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
}

.page-faq .dl-card .tag,
.page-faq .dl-card .status-chip {
  font-size: 10.5px;
  letter-spacing: .04em;
  padding: 3px 8px;
  border-radius: 999px;
}

/* ---------- 版本与检索 ---------- */
.page-faq .version-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-faq .stat-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-faq .stat {
  padding: 11px 13px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
}

.page-faq .stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.12;
  color: var(--paper);
}

.page-faq .stat__label {
  display: block;
  margin-top: 2px;
  font-size: 11.5px;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-faq .flow {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 6px;
}

.page-faq .flow__line {
  stroke: var(--line);
  stroke-width: 1.5;
  stroke-dasharray: 4 6;
}

.page-faq .flow__node {
  fill: var(--cyan);
}

.page-faq .flow__node--violet {
  fill: var(--violet);
}

.page-faq .flow__node--signal {
  fill: var(--signal);
}

.page-faq .flow-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 16px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-faq .flow-legend li {
  position: relative;
  padding-left: 11px;
}

.page-faq .flow-legend li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-faq .flow-legend li:nth-child(3)::before {
  background: var(--violet);
}

.page-faq .flow-legend li:nth-child(4)::before {
  background: var(--signal);
}

.page-faq .version-note {
  padding: 14px 16px;
  background: var(--ink-800);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--faq-radius) var(--faq-radius) 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .version-note p {
  margin: 0 0 9px;
}

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

.page-faq .version-grid .media {
  margin-bottom: 0;
}

/* ---------- 仍需帮助 ---------- */
.page-faq .help-card {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 32px);
  background: linear-gradient(155deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
}

.page-faq .help-card::after {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 43, .18), transparent 70%);
  pointer-events: none;
}

.page-faq .help-card h2 {
  position: relative;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.18;
  color: var(--paper);
}

.page-faq .help-card > p {
  position: relative;
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .help-list {
  position: relative;
  display: grid;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
}

.page-faq .help-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .help-list span {
  min-width: 42px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-faq .help-note {
  position: relative;
  margin: 0 0 20px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .help-card .btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .dl-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 13px;
  }

  .page-faq .stat-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .quick-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 13px;
  }

  .page-faq .faq-item__a {
    padding-left: 44px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 212px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 24px;
  }

  .page-faq .faq-rail .anchor-nav {
    flex-direction: column;
    gap: 1px;
    padding-bottom: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-rail .anchor-nav__link {
    white-space: normal;
    padding: 9px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1.5px;
    font-size: 14px;
  }

  .page-faq .faq-rail .anchor-nav__link[aria-current="true"] {
    border-bottom-color: transparent;
    border-left-color: var(--signal);
    background: var(--signal-soft);
  }

  .page-faq .version-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 24px;
    align-items: start;
  }

  .page-faq .faq-item__q {
    font-size: 15.5px;
    padding: 15px 18px;
  }

  .page-faq .faq-item__a {
    padding: 0 18px 18px 47px;
    font-size: 14.5px;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-hero {
    padding-bottom: clamp(44px, 5vw, 64px);
  }

  .page-faq .dl-card__title {
    font-size: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .quick,
  .page-faq .quick::after,
  .page-faq .dl-card,
  .page-faq .dl-card::before,
  .page-faq .filter-btn,
  .page-faq .faq-item {
    transition: none;
  }

  .page-faq .quick:hover,
  .page-faq .quick:focus-visible {
    transform: none;
  }
}