.page-faq {
  --faq-index-w: 236px;
  --faq-soft: rgba(51, 230, 209, 0.07);
  position: relative;
  isolation: isolate;
  color: var(--mist-100);
  background:
    radial-gradient(1100px 620px at 88% -10%, rgba(51, 230, 209, 0.10), transparent 62%),
    radial-gradient(760px 520px at 0% 38%, rgba(255, 107, 53, 0.07), transparent 60%),
    var(--abyss-950);
  padding-bottom: clamp(48px, 7vw, 110px);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to right,
    rgba(51, 230, 209, 0.05) 0 1px,
    transparent 1px 96px
  );
}

.page-faq .faq-shell {
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-faq .breadcrumb {
  padding-top: clamp(20px, 3vw, 40px);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(24px, 4vw, 52px) 0 clamp(26px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(38px, 9vw, 96px);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--mist-100);
}

.page-faq .faq-hero h1 strong {
  font-weight: 700;
  color: var(--cyan-400);
}

.page-faq .faq-hero .lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.8;
  color: rgba(233, 245, 248, 0.82);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 分类跳转条 ---------- */
.page-faq .faq-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-faq .faq-jump::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-jump::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-faq .faq-jump a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  color: var(--steel-400);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-jump a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-400);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  color: var(--abyss-950);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-faq .faq-jump a:hover span,
.page-faq .faq-jump a:focus-visible span {
  color: var(--abyss-950);
}

/* ---------- 分组 ---------- */
.page-faq .faq-section {
  padding: clamp(38px, 6vw, 82px) 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 24px;
}

.page-faq .faq-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-faq .faq-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5vw, 46px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--mist-100);
}

.page-faq .faq-section__head p {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel-400);
}

/* ---------- 索引 + 答案双栏 ---------- */
.page-faq .faq-cols {
  display: grid;
  gap: 18px;
}

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

.page-faq .faq-index a {
  display: flex;
  gap: 10px;
  padding: 11px 12px;
  border-left: 1px solid var(--line);
  color: var(--steel-400);
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-index a span {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-400);
  padding-top: 2px;
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  color: var(--mist-100);
  border-left-color: var(--cyan-400);
  background: var(--faq-soft);
}

.page-faq .faq-answers {
  display: grid;
  gap: 10px;
  min-width: 0;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 43, 71, 0.55), rgba(7, 29, 50, 0.3));
  scroll-margin-top: 24px;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-item[open] {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(11, 43, 71, 0.9), rgba(7, 29, 50, 0.45));
}

.page-faq .faq-item .accordion__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--mist-100);
}

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

.page-faq .faq-item .accordion__summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan-400);
}

.page-faq .faq-item[open] .accordion__summary::after {
  content: "\2212";
}

.page-faq .faq-item .accordion__summary:hover {
  background: var(--faq-soft);
}

.page-faq .faq-item .accordion__summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold-400);
  padding-top: 3px;
}

.page-faq .faq-item .accordion__body {
  padding: 0 16px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(233, 245, 248, 0.84);
}

.page-faq .faq-item .accordion__body p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item .accordion__body ul,
.page-faq .faq-item .accordion__body ol {
  margin: 0 0 10px;
  padding-left: 1.15em;
}

.page-faq .faq-item .accordion__body li {
  margin-bottom: 6px;
}

.page-faq .faq-item .accordion__body strong {
  color: var(--cyan-200);
  font-weight: 500;
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 44px) 0 0;
  border: 1px solid var(--line);
  background: var(--deep-900);
}

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

.page-faq .faq-figure .media__label {
  display: block;
  padding: 12px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

/* ---------- 指标表 ---------- */
.page-faq .metric-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 43, 71, 0.5), rgba(7, 29, 50, 0.28));
  -webkit-overflow-scrolling: touch;
}

.page-faq .metric-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .metric-table__caption {
  padding: 14px 16px 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel-400);
}

.page-faq .metric-table th,
.page-faq .metric-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .metric-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel-400);
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.page-faq .metric-table tbody th {
  color: var(--cyan-200);
  font-weight: 500;
  white-space: nowrap;
}

.page-faq .metric-table tbody td {
  color: rgba(233, 245, 248, 0.82);
}

.page-faq .metric-table tbody tr:last-child th,
.page-faq .metric-table tbody tr:last-child td {
  border-bottom: none;
}

.page-faq .metric-table tbody tr:hover {
  background: var(--faq-soft);
}

.page-faq .faq-note {
  margin: 14px 0 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-400);
}

/* ---------- 联系方式卡 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 12px;
  padding: clamp(38px, 6vw, 82px) 0 clamp(28px, 4vw, 48px);
}

.page-faq .faq-contact h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--mist-100);
}

.page-faq .contact-card {
  padding: 18px;
  border: 1px solid var(--line);
  background: rgba(7, 29, 50, 0.5);
}

.page-faq .contact-card--accent {
  border-color: rgba(255, 107, 53, 0.45);
  background: linear-gradient(160deg, rgba(255, 107, 53, 0.14), rgba(7, 29, 50, 0.42));
}

.page-faq .contact-card__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .contact-card--accent .contact-card__label {
  color: var(--lava-500);
}

.page-faq .contact-card__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist-100);
  word-break: break-word;
}

.page-faq .contact-card__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

/* ---------- 延展链接 ---------- */
.page-faq .faq-next {
  border-top: 1px solid var(--line);
  padding-top: clamp(26px, 4vw, 46px);
}

.page-faq .faq-next h2 {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-400);
}

.page-faq .faq-next__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-faq .faq-next__list a {
  display: grid;
  gap: 4px;
  padding: 16px 4px;
  color: var(--mist-100);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-faq .faq-next__list a span {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.65;
  color: var(--steel-400);
}

.page-faq .faq-next__list a:hover,
.page-faq .faq-next__list a:focus-visible {
  color: var(--cyan-400);
  padding-left: 10px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-faq .faq-hero h1 {
    font-size: clamp(32px, 11vw, 44px);
  }

  .page-faq .faq-item .accordion__summary {
    flex-wrap: wrap;
    gap: 6px 10px;
    font-size: 14.5px;
  }

  .page-faq .faq-item .accordion__summary::after {
    align-self: center;
  }

  .page-faq .faq-jump a {
    padding: 9px 12px;
    font-size: 12.5px;
  }
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 48px);
  }

  .page-faq .faq-next__list li:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line-soft);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-cols {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-index {
    display: grid;
    gap: 2px;
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-faq .faq-item .accordion__summary {
    padding: 18px 22px;
    font-size: 16px;
  }

  .page-faq .faq-item .accordion__body {
    padding: 0 22px 22px 58px;
    font-size: 15px;
  }

  .page-faq .faq-figure {
    margin-top: clamp(30px, 4vw, 52px);
  }
}

@media (min-width: 1180px) {
  .page-faq {
    --faq-index-w: 268px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump a,
  .page-faq .faq-index a,
  .page-faq .faq-item,
  .page-faq .faq-next__list a {
    transition: none;
  }
}