.page-faq {
  --faq-line: rgba(122, 139, 158, .2);
  --faq-line-soft: rgba(122, 139, 158, .12);
  --faq-cyan-soft: rgba(0, 228, 208, .07);
  --faq-side-pad: clamp(2.2em, 6vw, 3.2em);
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(104px, 15vw, 158px) 0 clamp(34px, 5vw, 58px);
  overflow: hidden;
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(13, 27, 42, .92) 0%, rgba(5, 9, 15, 0) 74%),
    repeating-linear-gradient(116deg, rgba(10, 58, 68, .5) 0 1px, transparent 1px 24px);
  pointer-events: none;
  z-index: -2;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: 4%;
  width: min(600px, 78vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(0, 228, 208, .16), transparent 62%);
  pointer-events: none;
  z-index: -1;
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(122, 139, 158, .5);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(122, 139, 158, .32);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-faq .breadcrumb [aria-current="page"] {
  color: var(--white);
}

.page-faq .faq-hero-title {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 72px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-faq .faq-hero-title::after {
  content: "";
  display: block;
  width: clamp(62px, 12vw, 138px);
  height: 3px;
  margin-top: 24px;
  background: var(--cyan);
}

.page-faq .faq-hero-lead {
  margin: 26px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-faq .faq-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero-facts .mono {
  font-family: var(--font-data);
  font-size: 21px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0;
}

/* ---------- 主题胶囊索引 ---------- */
.page-faq .faq-jump {
  position: sticky;
  top: 76px;
  z-index: 30;
}

.page-faq .faq-jump-inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 8px;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  background: rgba(13, 27, 42, .86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-jump-inner::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-jump-link {
  flex: 0 0 auto;
  padding: 8px 15px;
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  transition: color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .faq-jump-link:hover,
.page-faq .faq-jump-link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  outline: none;
}

/* ---------- 区块骨架 ---------- */
.page-faq .faq-block {
  padding: clamp(52px, 8vw, 96px) 0;
  scroll-margin-top: 150px;
}

.page-faq .faq-block + .faq-block {
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-block-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-block-num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-faq .faq-block-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: -.004em;
  color: var(--white);
}

.page-faq .faq-block-note {
  margin: 20px 0 0;
  max-width: 68ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-block-note a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 123, 255, .4);
}

.page-faq .faq-block-note a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: clamp(26px, 4vw, 42px) 0;
  border: 1px solid var(--faq-line);
  overflow: hidden;
}

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

.page-faq .faq-figure--side {
  margin: 0;
}

/* ---------- 问答列表 ---------- */
.page-faq .faq-list {
  margin-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-list--flush {
  margin-top: 0;
}

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

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: 2.4em 1fr 16px;
  gap: 12px;
  align-items: start;
  padding: 20px 6px 20px 0;
  list-style: none;
  cursor: pointer;
  transition: background-color .28s var(--ease), transform .28s var(--ease);
}

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

.page-faq .faq-item > summary:hover {
  background: var(--faq-cyan-soft);
  transform: translateX(5px);
}

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

.page-faq .faq-num {
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.75;
  letter-spacing: .04em;
  color: rgba(122, 139, 158, .72);
  transition: color .28s var(--ease);
}

.page-faq .faq-item[open] .faq-num {
  color: var(--cyan);
}

.page-faq .faq-q {
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 500;
  line-height: 1.55;
  color: var(--white);
}

.page-faq .faq-mark {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 6px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--mist);
  transition: transform .3s var(--ease), background-color .3s var(--ease);
}

.page-faq .faq-mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-mark::before {
  background: var(--cyan);
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: scaleY(0);
}

.page-faq .faq-a {
  padding: 0 6px 28px var(--faq-side-pad);
  max-width: 74ch;
  animation: faq-fade .34s var(--ease) both;
}

@keyframes faq-fade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--mist);
}

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

.page-faq .faq-a a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 123, 255, .4);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-faq .faq-formula {
  display: inline-block;
  margin: 0 0 14px;
  padding: 9px 16px;
  border-left: 2px solid var(--cyan);
  background: var(--faq-cyan-soft);
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--cyan);
}

/* ---------- 主客场分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-faq .faq-side {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-faq .faq-chart {
  margin: 0;
  padding: 22px 20px 18px;
  border: 1px solid var(--faq-line);
  background: linear-gradient(158deg, rgba(18, 41, 58, .92), rgba(13, 27, 42, .5));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-chart-title {
  display: block;
  margin-bottom: 18px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-chart-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 联系方式 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-faq .faq-contact-card {
  padding: clamp(24px, 3.5vw, 34px);
  border: 1px solid rgba(0, 228, 208, .26);
  background: linear-gradient(152deg, rgba(0, 228, 208, .1), rgba(13, 27, 42, .72) 58%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-faq .faq-contact-label {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-contact-mail {
  display: inline-block;
  margin: 10px 0 16px;
  font-family: var(--font-data);
  font-size: clamp(15px, 2.2vw, 20px);
  line-height: 1.4;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 228, 208, .38);
  word-break: break-all;
  transition: border-color .25s var(--ease);
}

.page-faq .faq-contact-mail:hover,
.page-faq .faq-contact-mail:focus-visible {
  border-color: var(--cyan);
  outline: none;
}

.page-faq .faq-contact-note {
  margin: 0 0 14px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-contact-meta {
  margin: 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(122, 139, 158, .85);
}

.page-faq .faq-contact-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-contact-topics {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-contact-topics li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--faq-line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  transition: color .25s var(--ease), transform .25s var(--ease);
}

.page-faq .faq-contact-topics li::before {
  content: "—";
  flex: 0 0 auto;
  font-family: var(--font-data);
  color: var(--cyan);
}

.page-faq .faq-contact-topics li:hover {
  color: var(--white);
  transform: translateX(5px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .page-faq .faq-jump {
    top: 68px;
  }

  .page-faq .faq-jump-inner {
    border-radius: 18px;
  }

  .page-faq .faq-item > summary {
    grid-template-columns: 2em 1fr 16px;
    gap: 10px;
    padding-right: 2px;
  }

  .page-faq .faq-a {
    padding-left: 2em;
  }

  .page-faq .faq-hero-facts {
    gap: 12px 22px;
  }

  .page-faq .faq-hero-facts .mono {
    font-size: 18px;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-hero-title {
    font-size: clamp(28px, 9vw, 38px);
  }

  .page-faq .faq-q {
    font-size: 15.5px;
  }

  .page-faq .faq-a p {
    font-size: 15px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-split {
    grid-template-columns: 1.5fr .85fr;
    align-items: start;
  }

  .page-faq .faq-list--flush {
    margin-top: 0;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-contact {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }

  .page-faq .faq-item > summary:hover,
  .page-faq .faq-contact-topics li:hover {
    transform: none;
  }
}