.page-faq {
  --dir-col: 236px;
  --qa-gap: 56px;
  background: var(--c-base);
  color: var(--c-text);
}

/* ---------- 首屏 ---------- */
.page-faq .help-hero {
  position: relative;
  padding-top: 38px;
  background:
    radial-gradient(120% 78% at 84% -14%, var(--glow-green), transparent 58%),
    linear-gradient(180deg, var(--c-indigo) 0%, var(--c-base) 86%);
}

.page-faq .help-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-orange) 58%, transparent 100%);
  opacity: .55;
}

.page-faq .breadcrumb {
  margin-bottom: 28px;
}

.page-faq .hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-green);
}

.page-faq .hero-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--c-green);
  flex: none;
}

.page-faq h1 {
  margin: 0 0 18px;
  max-width: 19ch;
  font-size: clamp(26px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.012em;
  color: var(--c-text);
}

.page-faq .hero-lead {
  margin: 0 0 28px;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-fog);
}

/* ---------- 三步路径 ---------- */
.page-faq .quick-path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding: 13px 16px;
  margin-bottom: 34px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-green);
  background: rgba(14, 22, 38, .7);
  font-size: 13px;
  color: var(--c-fog);
}

.page-faq .quick-path-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-fog);
  padding-right: 4px;
}

.page-faq .qp-step {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
}

.page-faq .qp-step .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-green);
}

.page-faq .qp-sep {
  width: 24px;
  height: 1px;
  flex: none;
  background: repeating-linear-gradient(90deg, var(--line-firm) 0 4px, transparent 4px 8px);
}

/* ---------- 首屏宽幅图 ---------- */
.page-faq .hero-figure {
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
  background: var(--c-panel);
  overflow: hidden;
}

.page-faq .hero-figure img {
  display: block;
  width: 100%;
  max-width: var(--shell);
  height: auto;
  max-height: 336px;
  margin: 0 auto;
  object-fit: cover;
  opacity: .8;
}

/* ---------- 主体两栏 ---------- */
.page-faq .help-body {
  padding-top: 46px;
}

.page-faq .help-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* ---------- 左侧分类目录 ---------- */
.page-faq .dir-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-fog);
}

.page-faq .dir-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .dir-link {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  color: var(--c-fog);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-faq .dir-link .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--c-green);
  margin-right: 8px;
}

.page-faq .dir-link:hover,
.page-faq .dir-link:focus-visible {
  color: var(--c-text);
  border-color: var(--c-green);
  background: linear-gradient(90deg, var(--glow-green), transparent 78%);
}

.page-faq .dir-link:focus-visible {
  outline: 2px solid var(--c-green);
  outline-offset: 2px;
}

/* ---------- 问题分组 ---------- */
.page-faq .qa-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  margin-top: 36px;
  padding-top: 34px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .qa-group:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .qa-group-head {
  margin-bottom: 18px;
}

.page-faq .qa-group-title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.5vw, 25px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.006em;
  color: var(--c-text);
}

.page-faq .qa-group-title::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 2px;
  margin-right: 10px;
  vertical-align: .3em;
  background: var(--c-green);
}

.page-faq .qa-group-desc {
  margin: 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-fog);
}

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

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

.page-faq .qa > summary {
  position: relative;
  display: block;
  padding: 17px 46px 17px 2px;
  list-style: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-text);
  transition: color 180ms ease, background 180ms ease;
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa > summary::after {
  content: "";
  position: absolute;
  right: 16px;
  top: calc(50% - 5px);
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--c-line);
  border-bottom: 2px solid var(--c-line);
  transform: rotate(45deg);
  transition: transform 220ms ease, border-color 180ms ease;
}

.page-faq .qa > summary:hover {
  color: var(--c-green);
}

.page-faq .qa > summary:hover::after {
  border-color: var(--c-green);
}

.page-faq .qa > summary:focus-visible {
  outline: 2px solid var(--c-green);
  outline-offset: -2px;
  border-radius: var(--r);
}

.page-faq .qa[open] > summary {
  color: var(--c-green);
  background: linear-gradient(90deg, var(--glow-green), transparent 62%);
}

.page-faq .qa[open] > summary::after {
  transform: rotate(225deg);
  border-color: var(--c-green);
}

.page-faq .qa-body {
  padding: 4px 46px 22px 2px;
  max-width: 44em;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--c-fog);
}

.page-faq .qa-body p {
  margin: 0 0 12px;
}

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

.page-faq .qa-body a {
  color: var(--c-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 255, 60, .42);
  transition: border-color 160ms ease;
}

.page-faq .qa-body a:hover {
  border-bottom-color: var(--c-green);
}

/* ---------- 步骤列表 ---------- */
.page-faq .steps {
  counter-reset: stp;
  list-style: none;
  margin: 14px 0 16px;
  padding: 0;
}

.page-faq .steps li {
  counter-increment: stp;
  position: relative;
  padding-left: 38px;
  margin-bottom: 13px;
  line-height: 1.7;
}

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

.page-faq .steps li::before {
  content: counter(stp, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-green);
}

.page-faq .steps li::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 9px;
  bottom: -13px;
  width: 1px;
  background: var(--line-soft);
}

.page-faq .steps li:last-child::after {
  display: none;
}

/* ---------- 下载示意图 ---------- */
.page-faq .dl-figure {
  margin: 18px 0 20px;
}

.page-faq .dl-figure img {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  border: 1px solid var(--line-soft);
  background: var(--c-panel);
}

/* ---------- 收尾 ---------- */
.page-faq .help-fallback {
  position: relative;
  margin-top: 66px;
  padding: 42px 0 72px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .help-fallback::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 88px;
  height: 3px;
  background: var(--c-orange);
}

.page-faq .fallback-title {
  margin: 0 0 12px;
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-text);
}

.page-faq .fallback-copy {
  margin: 0 0 22px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-fog);
}

.page-faq .fallback-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.page-faq .fallback-note {
  margin: 0;
  max-width: 46em;
  padding-left: 14px;
  border-left: 2px solid var(--c-teal);
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-fog);
}

.page-faq .fallback-note a {
  color: var(--c-text);
  text-decoration: none;
  border-bottom: 1px solid var(--line-firm);
}

.page-faq .fallback-note a:hover {
  border-bottom-color: var(--c-green);
  color: var(--c-green);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 900px) {
  .page-faq .help-hero {
    padding-top: 46px;
  }

  .page-faq .quick-path {
    padding: 14px 20px;
  }

  .page-faq .help-body {
    padding-top: 56px;
  }

  .page-faq .help-grid {
    grid-template-columns: var(--dir-col) minmax(0, 1fr);
    gap: 0 var(--qa-gap);
    align-items: start;
  }

  .page-faq .help-dir {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    border-right: 1px solid var(--line-soft);
    padding-right: 26px;
  }

  .page-faq .dir-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-faq .dir-list li + li {
    margin-top: 2px;
  }

  .page-faq .dir-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 11px 16px;
    white-space: normal;
    font-size: 14px;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1200px) {
  .page-faq .help-grid {
    grid-template-columns: var(--dir-col) minmax(0, 1fr) 88px;
    gap: 0 var(--qa-gap);
  }

  .page-faq .help-qa {
    grid-column: 2;
  }

  .page-faq .help-grid::after {
    content: "";
    grid-column: 3;
    grid-row: 1;
    justify-self: stretch;
    align-self: stretch;
    margin-left: 8px;
    background: linear-gradient(180deg,
      transparent 0%,
      rgba(91, 107, 133, .22) 6%,
      rgba(91, 107, 133, .22) 94%,
      transparent 100%);
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa > summary::after,
  .page-faq .dir-link,
  .page-faq .qa > summary {
    transition: none;
  }
}