.page-faq {
  --faq-rule: 1px solid var(--line-soft);
  padding-top: calc(var(--bar-h) + 24px);
  padding-bottom: 72px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  border-top: var(--faq-rule);
  padding-top: 24px;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 8.2vw, 56px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  margin: 0 0 30px;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

/* 四项关键数字 */
.page-faq .faq-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: var(--faq-rule);
}

.page-faq .faq-metric {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 14px 18px;
  background: var(--panel);
  position: relative;
}

.page-faq .faq-metric::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--steel);
}

.page-faq .faq-metric:nth-child(1)::before { background: var(--cyan); }
.page-faq .faq-metric:nth-child(2)::before { background: var(--sand); }
.page-faq .faq-metric:nth-child(3)::before { background: var(--orange); }
.page-faq .faq-metric:nth-child(4)::before { background: var(--cyan); }

.page-faq .faq-metric__num {
  font-family: var(--font-mono);
  font-size: clamp(36px, 9.5vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.page-faq .faq-metric:nth-child(2) .faq-metric__num { color: var(--sand); }
.page-faq .faq-metric:nth-child(3) .faq-metric__num { color: var(--orange); }
.page-faq .faq-metric:nth-child(4) .faq-metric__num { color: var(--white); }

.page-faq .faq-metric__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-metric__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--white);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 0 0 44px;
  border: var(--faq-rule);
  background: var(--panel);
}

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

.page-faq .faq-figure .media__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-faq .faq-figure--inset {
  margin-top: 22px;
  margin-bottom: 8px;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 28px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: var(--faq-rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-faq .faq-index__list a {
  display: block;
  padding: 8px 12px;
  background: var(--panel);
  border-left: 2px solid var(--steel);
  color: var(--white);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  border-left-color: var(--cyan);
  background: var(--cyan-deep);
  color: var(--cyan);
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  margin-bottom: 42px;
  scroll-margin-top: calc(var(--bar-h-stuck) + 20px);
}

.page-faq .faq-sec__head {
  margin-bottom: 18px;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
}

.page-faq .faq-sec__head h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.4vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-sec__head p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 折叠问答 */
.page-faq .faq-item {
  margin-bottom: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-item[open] {
  background: var(--panel-2);
  border-left-color: var(--cyan);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 14px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--white);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-item[open] summary::after {
  content: "−";
}

.page-faq .faq-item summary:hover {
  color: var(--cyan);
}

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

.page-faq .faq-item__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.page-faq .faq-item__a {
  padding: 13px 14px 17px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

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

.page-faq .faq-item__a a:hover {
  color: var(--white);
}

.page-faq .faq-item__a .chip {
  margin-left: 6px;
  vertical-align: 1px;
}

/* ---------- 联络面板 ---------- */
.page-faq .faq-sec--support {
  margin-bottom: 8px;
}

.page-faq .faq-cta {
  padding: 22px 18px 24px;
  background: linear-gradient(158deg, var(--panel-2) 0%, var(--panel) 62%, var(--cyan-deep) 100%);
  border: var(--faq-rule);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-faq .faq-cta__lead {
  margin: 0 0 20px;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
}

.page-faq .faq-cta__list {
  margin: 0 0 14px;
  padding: 0;
}

.page-faq .faq-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-cta__row dt {
  flex: none;
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-faq .faq-cta__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.page-faq .faq-cta__row dd a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
}

.page-faq .faq-cta__row dd a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-cta__note {
  margin: 0 0 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-faq {
    padding-top: calc(var(--bar-h) + 36px);
    padding-bottom: 96px;
  }

  .page-faq .faq-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 40px;
  }

  .page-faq .faq-metric {
    padding: 20px 18px 22px;
  }

  .page-faq .faq-figure {
    margin-bottom: 52px;
  }

  .page-faq .faq-item summary {
    padding: 17px 18px;
    font-size: 16px;
  }

  .page-faq .faq-item__a {
    padding: 15px 18px 20px;
  }

  .page-faq .faq-cta {
    padding: 30px 28px 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h-stuck) + 26px);
    align-self: start;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-faq .faq-sec {
    margin-bottom: 52px;
  }

  .page-faq .faq-figure--inset {
    max-width: 68%;
    margin-left: auto;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero h1 {
    max-width: 18ch;
  }

  .page-faq .faq-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 60px;
  }
}

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