.page-faq {
  --faq-rail: 244px;
  --faq-block-gap: clamp(24px, 3.4vw, 44px);
  position: relative;
  overflow-x: clip;
  padding: clamp(96px, 12vw, 128px) 0 clamp(56px, 8vw, 96px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-faq .faq-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(28, 58, 90, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 58, 90, 0.34) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 78% at 22% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 78% at 22% 0%, #000 0%, transparent 72%);
  opacity: 0.72;
}

.page-faq .faq-glow {
  position: absolute;
  top: -200px;
  right: -140px;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(47, 243, 208, 0.18), transparent 66%);
}

.page-faq .faq-shell {
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.page-faq .faq-crumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-faq .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

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

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

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
  padding-bottom: clamp(26px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.2vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__title span {
  color: var(--cyan);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: clamp(0.96rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  color: var(--mist);
}

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

.page-faq .faq-hero__facts .num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--paper);
}

/* 图片容器 */
.page-faq .faq-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(165deg, var(--panel), var(--ink-2));
}

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

.page-faq .faq-figure__tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 11px;
  border: 1px solid rgba(47, 243, 208, 0.4);
  border-radius: 999px;
  background: rgba(7, 20, 38, 0.78);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-figure--portrait {
  margin-top: clamp(20px, 3vw, 32px);
  max-width: 460px;
}

/* 双栏结构 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(26px, 4vw, 46px);
}

/* 左侧主题索引 */
.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--mist);
  font-size: 0.83rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--paper);
  border-color: rgba(47, 243, 208, 0.5);
}

.page-faq .faq-rail__link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-rail__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  opacity: 0.72;
}

/* 章节 */
.page-faq .faq-section {
  scroll-margin-top: 104px;
}

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

.page-faq .faq-section__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 12px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-faq .index-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 1.92rem);
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-section__sub {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}

/* 折叠问答 */
.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(150deg, var(--panel), rgba(7, 20, 38, 0.62));
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 8px;
}

.page-faq .faq-item:hover {
  border-color: rgba(47, 243, 208, 0.42);
}

.page-faq .faq-item[open] {
  border-color: rgba(47, 243, 208, 0.55);
  background: linear-gradient(150deg, var(--panel-2), rgba(7, 20, 38, 0.72));
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--cyan);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.page-faq .faq-item__a {
  padding: 12px 15px 16px;
  border-top: 1px dashed var(--line);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-item__a p {
  margin: 0;
}

.page-faq .faq-item__a p + p {
  margin-top: 9px;
}

.page-faq .faq-item__a .k {
  font-family: var(--font-mono);
  font-size: 0.94em;
  font-weight: 700;
  color: var(--cyan);
}

.page-faq .faq-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, 0.45);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-faq .faq-inline-link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 步骤条 */
.page-faq .faq-steps {
  counter-reset: faqstep;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  flex: 1 1 128px;
  min-width: 0;
  padding: 9px 0 0;
  border-top: 2px solid var(--line);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-steps li::before {
  content: "0" counter(faqstep);
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--orange);
}

/* 结尾通道 */
.page-faq .faq-still {
  margin-top: var(--faq-block-gap);
  padding-top: var(--faq-block-gap);
  border-top: 1px solid var(--line);
  scroll-margin-top: 104px;
}

.page-faq .faq-still__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid rgba(47, 243, 208, 0.3);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 122, 47, 0.16), transparent 58%),
    linear-gradient(140deg, rgba(47, 243, 208, 0.1), rgba(14, 36, 64, 0.9) 58%, rgba(7, 20, 38, 0.95));
}

.page-faq .faq-still__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-still__text {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-still__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.89rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-faq .btn:active {
  transform: translateY(1px);
}

.page-faq .btn--primary {
  background: var(--orange);
  color: #0B1622;
}

.page-faq .btn--primary:hover {
  background: #FF9153;
}

.page-faq .btn--ghost {
  border-color: var(--line);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.03);
}

.page-faq .btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-faq .faq-hero__figure {
    align-self: stretch;
  }

  .page-faq .faq-hero__figure img {
    height: 100%;
    object-fit: cover;
  }
}

/* 桌面双栏 */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    justify-content: flex-start;
    gap: 10px;
    padding: 9px 12px 9px 14px;
    border: none;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    font-size: 0.88rem;
    white-space: normal;
  }

  .page-faq .faq-rail__link[aria-current="true"] {
    background: linear-gradient(90deg, rgba(47, 243, 208, 0.16), transparent 85%);
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .page-faq .faq-item__q {
    padding: 15px 18px;
    font-size: 1rem;
  }

  .page-faq .faq-item__a {
    padding: 14px 18px 18px;
    font-size: 0.93rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-item,
  .page-faq .btn,
  .page-faq .faq-inline-link {
    transition: none;
  }
}