.page-faq {
  --faq-block: clamp(44px, 7vw, 84px);
  --faq-line: 1px solid var(--frost);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

.page-faq h1,
.page-faq h2,
.page-faq h3,
.page-faq h4 {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.22;
}

.page-faq p {
  margin: 0;
}

.page-faq a {
  color: var(--blue);
}

.page-faq .breadcrumb {
  padding-block: 22px 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 16px;
  max-width: 56em;
  border-left: 4px solid var(--red);
  padding-left: clamp(16px, 2.4vw, 28px);
}

.page-faq .faq-hero h1 {
  font-size: clamp(28px, 5.4vw, 50px);
  line-height: 1.14;
}

.page-faq .faq-hero__lead {
  max-width: 38em;
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--ink-2);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-faq .faq-hero__figure {
  margin: clamp(26px, 4vw, 44px) auto 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--mist-a), var(--mist-b));
  box-shadow: var(--shadow-2);
  object-fit: cover;
}

/* ---------- 通用区块 ---------- */
.page-faq .faq-section {
  padding-block: var(--faq-block);
}

.page-faq .faq-section__head {
  display: grid;
  gap: 12px;
  max-width: 46em;
}

.page-faq .faq-section__intro {
  max-width: 42em;
  color: var(--slate);
}

.page-faq .faq-section__next {
  margin-top: 22px;
  font-size: 14.5px;
  color: var(--slate);
}

/* ---------- 三步核对 ---------- */
.page-faq .faq-steps {
  background: linear-gradient(165deg, var(--mist-a) 0%, var(--paper) 58%);
  border-block: var(--faq-line);
}

.page-faq .faq-steps__cards {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-faq .faq-step-card {
  position: relative;
  padding: 26px 20px 22px;
  background: var(--white);
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-step-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 3px;
  background: var(--red);
}

.page-faq .faq-step-card:nth-child(2)::before {
  background: var(--green);
}

.page-faq .faq-step-card:nth-child(3)::before {
  background: var(--blue);
}

.page-faq .faq-step-card__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-faq .faq-step-card:nth-child(2) .faq-step-card__no {
  color: var(--green-deep);
}

.page-faq .faq-step-card:nth-child(3) .faq-step-card__no {
  color: var(--blue);
}

.page-faq .faq-step-card h3 {
  margin-bottom: 8px;
  font-size: 19px;
}

.page-faq .faq-step-card p {
  font-size: 15px;
  color: var(--ink-2);
}

.page-faq .faq-step-card__hint {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--frost);
  font-size: 13.5px;
  color: var(--slate);
}

.page-faq .faq-steps__filter {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-steps__panels {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-faq .faq-step-panel {
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--frost);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  color: var(--ink-2);
}

.page-faq .faq-step-panel h4 {
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-faq .faq-step-panel strong {
  color: var(--red-deep);
}

/* ---------- 期次缺失 ---------- */
.page-faq .faq-missing__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-faq .faq-missing__body {
  display: grid;
  gap: 14px;
}

.page-faq .faq-track {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--faq-line);
}

.page-faq .faq-track__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: var(--faq-line);
}

.page-faq .faq-track__no {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--frost);
  border-radius: 50%;
  background: var(--white);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
}

.page-faq .faq-track__item h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.page-faq .faq-track__item p {
  font-size: 15px;
  color: var(--ink-2);
}

.page-faq .faq-verdict {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--slate);
}

.page-faq .faq-verdict .status-dot {
  flex: none;
  margin-top: 7px;
}

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

.page-faq .faq-missing__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-1);
}

/* ---------- 版本差异 ---------- */
.page-faq .faq-version {
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
}

.page-faq .faq-table-wrap {
  margin-top: clamp(22px, 3vw, 34px);
  overflow-x: auto;
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-version-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-faq .faq-version-table caption {
  caption-side: top;
  padding: 14px 16px;
  text-align: left;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  border-bottom: var(--faq-line);
}

.page-faq .faq-version-table th,
.page-faq .faq-version-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--faq-line);
}

.page-faq .faq-version-table thead th {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  background: var(--paper-2);
  white-space: nowrap;
}

.page-faq .faq-version-table tbody th {
  font-weight: 700;
  white-space: nowrap;
  color: var(--ink);
}

.page-faq .faq-version-table td {
  color: var(--ink-2);
}

.page-faq .faq-version-table tbody tr:last-child th,
.page-faq .faq-version-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-version-note {
  max-width: 44em;
  margin-top: 20px;
  font-size: 15px;
  color: var(--slate);
}

/* ---------- 资源下载故障 ---------- */
.page-faq .faq-qa-list {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-qa {
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-faq .faq-qa + .faq-qa {
  margin-top: 12px;
}

.page-faq .faq-qa > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  list-style: none;
}

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

.page-faq .faq-qa > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--red);
}

.page-faq .faq-qa[open] > summary {
  border-bottom: var(--faq-line);
}

.page-faq .faq-qa[open] > summary::after {
  content: "–";
}

.page-faq .faq-qa__idx {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-faq .faq-qa__body {
  padding: 16px 18px 20px;
  font-size: 15px;
  color: var(--ink-2);
}

.page-faq .faq-qa__body p + p {
  margin-top: 10px;
}

.page-faq .faq-qa__body .faq-verdict {
  margin-top: 12px;
}

/* ---------- 术语速查 ---------- */
.page-faq .faq-terms__grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-faq .faq-terms__list {
  border-top: var(--faq-line);
}

.page-faq .faq-term {
  padding: 18px 0;
  border-bottom: var(--faq-line);
  scroll-margin-top: 100px;
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .faq-term:target {
  background: linear-gradient(90deg, rgba(216, 6, 33, 0.07), rgba(216, 6, 33, 0) 66%);
  box-shadow: inset 4px 0 0 var(--red);
}

.page-faq .faq-term h3 {
  margin-bottom: 6px;
  font-size: 18px;
}

.page-faq .faq-term p {
  max-width: 40em;
  font-size: 15px;
  color: var(--ink-2);
}

.page-faq .faq-terms__index {
  order: -1;
  align-self: start;
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--frost);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-terms__cap {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-terms__index ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-terms__index a {
  display: inline-block;
  padding: 5px 11px;
  font-size: 13px;
  color: var(--blue);
  text-decoration: none;
  border: 1px solid var(--frost);
  border-radius: 999px;
  background: var(--paper);
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-terms__index a:hover,
.page-faq .faq-terms__index a:focus-visible {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}

/* ---------- 人工协助 ---------- */
.page-faq .faq-help-section {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-faq .faq-help {
  padding: clamp(28px, 4vw, 54px);
  background: var(--blue-deep);
  border-radius: var(--radius);
  color: var(--white);
}

.page-faq .faq-help h2 {
  color: var(--white);
}

.page-faq .faq-help .eyebrow {
  color: var(--frost);
}

.page-faq .faq-help__lead {
  max-width: 40em;
  margin-top: 14px;
  font-size: clamp(15.5px, 1.7vw, 17px);
  color: rgba(255, 255, 255, 0.82);
}

.page-faq .faq-help__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.88);
}

.page-faq .faq-help__list li + li {
  margin-top: 10px;
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--amber);
  transform: rotate(45deg);
}

.page-faq .faq-help__note {
  max-width: 42em;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(195, 207, 220, 0.28);
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.72);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-steps__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-missing__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-terms__grid {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }

  .page-faq .faq-terms__index {
    order: 0;
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-terms__index ul {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-faq .faq-terms__index a {
    display: block;
    padding: 7px 0 7px 12px;
    border: 0;
    border-left: 2px solid var(--frost);
    border-radius: 0;
    background: none;
    font-size: 14px;
  }

  .page-faq .faq-terms__index a:hover,
  .page-faq .faq-terms__index a:focus-visible {
    background: none;
    border-left-color: var(--red);
    color: var(--red);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-term,
  .page-faq .faq-terms__index a {
    transition: none;
  }
}