.page-faq {
  --faq-shell-pad: var(--gutter);
  --faq-col-gap: clamp(28px, 4vw, 72px);
  --faq-cyan-wash: rgba(55, 245, 193, 0.06);
  --faq-cyan-glow: rgba(55, 245, 193, 0.1);
  --faq-ink-fade: rgba(16, 36, 26, 0);
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 8vw, 120px);
}

.page-faq .faq-shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--faq-shell-pad);
}

/* 面包屑 */
.page-faq .breadcrumbs {
  padding-top: clamp(18px, 2.4vw, 30px);
}
.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .breadcrumb-item {
  display: inline-flex;
  align-items: baseline;
}
.page-faq .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-inline: 10px;
  color: var(--line);
}
.page-faq .breadcrumb-item a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .breadcrumb-item a:hover,
.page-faq .breadcrumb-item a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(120% 96% at 84% 0%, var(--faq-cyan-glow), transparent 62%),
    linear-gradient(180deg, var(--ink-2), var(--ink) 78%);
  padding-block: clamp(36px, 6vw, 88px) clamp(30px, 4.4vw, 60px);
}
.page-faq .faq-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-faq .faq-h1 {
  margin: clamp(18px, 2.6vw, 30px) 0 0;
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(32px, 6.2vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  max-width: 20ch;
  color: var(--paper);
}
.page-faq .faq-lede {
  margin: clamp(20px, 2.8vw, 34px) 0 0;
  max-width: var(--maxw-read);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.84;
}

/* 关键参数条 */
.page-faq .faq-strip {
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}
.page-faq .faq-strip-item {
  background-color: var(--ink);
  padding: clamp(14px, 1.6vw, 20px);
}
.page-faq .faq-strip dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .faq-strip dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.5vw, 18px);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  word-break: break-word;
}

/* 主体两栏 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(36px, 5vw, 72px);
}

/* 左侧目录 */
.page-faq .faq-index-inner {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.page-faq .faq-index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-faq .faq-index-list li {
  flex: 0 0 auto;
}
.page-faq .faq-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan);
  background-color: var(--faq-cyan-wash);
}
.page-faq .faq-index-note {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
}
.page-faq .faq-index-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-index-note a:hover,
.page-faq .faq-index-note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 问题条目 */
.page-faq .faq-section {
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.page-faq .faq-section:last-child {
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-item {
  display: block;
}
.page-faq .faq-item[open] {
  background-image: linear-gradient(180deg, var(--ink-2), var(--faq-ink-fade) 80%);
}
.page-faq .faq-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: clamp(12px, 1.6vw, 22px);
  padding: clamp(20px, 2.6vw, 32px) clamp(14px, 1.6vw, 20px);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease);
}
.page-faq .faq-summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-summary:hover {
  background-color: var(--faq-cyan-wash);
}
.page-faq .faq-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}
.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-faq .faq-q {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 25px);
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--paper);
}
.page-faq .faq-toggle {
  position: relative;
  align-self: center;
  width: 22px;
  height: 22px;
}
.page-faq .faq-toggle::before,
.page-faq .faq-toggle::after {
  content: "";
  position: absolute;
  background-color: var(--cyan);
}
.page-faq .faq-toggle::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
}
.page-faq .faq-toggle::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.page-faq .faq-item[open] .faq-toggle::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-answer {
  padding: 0 clamp(14px, 1.6vw, 20px) clamp(26px, 3.4vw, 44px);
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.85;
  color: var(--paper);
}
.page-faq .faq-answer > * + * {
  margin-top: clamp(16px, 2vw, 26px);
}
.page-faq .faq-answer > p {
  margin-block: 0;
  max-width: var(--maxw-read);
  opacity: 0.88;
}

/* 步骤轨道 */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .faq-step {
  position: relative;
  padding-left: 56px;
  padding-bottom: clamp(20px, 2.4vw, 30px);
}
.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 40px;
  bottom: 4px;
  width: 1px;
  background-color: var(--line);
}
.page-faq .faq-step:last-child::before {
  display: none;
}
.page-faq .faq-step-num {
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background-color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-faq .faq-step-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.45;
  color: var(--cyan-soft);
}
.page-faq .faq-step p {
  margin: 0;
  max-width: var(--maxw-read);
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.85;
  opacity: 0.86;
}

/* 要点列表 */
.page-faq .faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .faq-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.page-faq .faq-list li:last-child {
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-list-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-faq .faq-list li > span:last-child {
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.85;
  opacity: 0.88;
}

/* 表格 */
.page-faq .faq-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
}
.page-faq .faq-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: clamp(13px, 1.25vw, 15px);
}
.page-faq .faq-table th,
.page-faq .faq-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.page-faq .faq-table thead th {
  background-color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
}
.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}
.page-faq .faq-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

/* 配图 */
.page-faq .faq-figure {
  margin: clamp(20px, 2.6vw, 32px) 0 0;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background-color: var(--ink-2);
}
.page-faq .figure-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* 排查树 */
.page-faq .faq-tree-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background-color: var(--ink-2);
}
.page-faq .faq-tree {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}
.page-faq .ft-line path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}
.page-faq .ft-node rect {
  fill: var(--ink);
  stroke: var(--line);
  stroke-width: 1;
}
.page-faq .ft-label text {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--paper);
}
.page-faq .ft-note text {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--muted);
}

/* 联系区块 */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}
.page-faq .faq-contact-item {
  background-color: var(--ink);
  padding: clamp(16px, 2vw, 24px);
}
.page-faq .faq-contact-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .faq-contact-value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.5vw, 17px);
  color: var(--cyan);
  word-break: break-word;
}
.page-faq .faq-contact-value--text {
  font-family: var(--font-body);
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.7;
  color: var(--paper);
}
.page-faq .faq-contact-value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}
.page-faq .faq-contact-value a:hover,
.page-faq .faq-contact-value a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-faq .faq-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-faq .faq-cta:hover,
.page-faq .faq-cta:focus-visible {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--black);
}
.page-faq .faq-cta--ghost:hover,
.page-faq .faq-cta--ghost:focus-visible {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--black);
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-faq .faq-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-list li {
    grid-template-columns: minmax(0, 132px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 桌面双栏 */
@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(184px, 2.4fr) minmax(0, 7.6fr);
    gap: var(--faq-col-gap);
    align-items: start;
  }
  .page-faq .faq-index-inner {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }
  .page-faq .faq-index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-faq .faq-index-list li {
    flex: none;
  }
  .page-faq .faq-index-list li + li {
    margin-top: 2px;
  }
  .page-faq .faq-index-link {
    display: flex;
    width: 100%;
    padding: 9px 0 9px 12px;
    border: 0;
    border-left: 1px solid var(--line);
    white-space: normal;
    align-items: baseline;
  }
  .page-faq .faq-index-link:hover,
  .page-faq .faq-index-link:focus-visible {
    border-left-color: var(--cyan);
    background-color: var(--faq-cyan-wash);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}