.page-faq {
  --faq-rail: 12.5rem;
  --faq-gap: clamp(1.4rem, 4vw, 3.2rem);
  --faq-hair: rgba(44, 58, 110, 0.62);
  --faq-tick: rgba(44, 58, 110, 0.4);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-faq .crumbs {
  margin-bottom: clamp(1rem, 2.5vw, 1.8rem);
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.6rem);
  padding-block: clamp(0.4rem, 2vw, 1.4rem) clamp(2rem, 5vw, 3.6rem);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-hero h1 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 7.2vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cloud);
}

.page-faq .faq-hero .lede {
  margin-top: 1.1rem;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-hero__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__keys li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--faq-hair);
  font-size: 0.8rem;
  color: var(--slate);
}

.page-faq .faq-hero__keys .mono {
  color: var(--cyan);
  font-size: 0.78rem;
}

.page-faq .faq-hero__media {
  margin: 0;
}

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

/* ============ 主体两栏 ============ */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-top: clamp(1.8rem, 5vw, 3rem);
}

/* 快速定位索引 */
.page-faq .faq-index__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0.15rem 0.1rem 0.65rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__list::-webkit-scrollbar {
  height: 2px;
}

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

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--faq-hair);
  background: rgba(22, 32, 74, 0.55);
  color: var(--slate);
  font-size: 0.85rem;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cyan);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cloud);
  border-color: var(--cyan);
  transform: translateX(2px);
}

/* ============ 章节 ============ */
.page-faq .faq-sec {
  scroll-margin-top: 4.5rem;
  padding-block: clamp(1.8rem, 4vw, 2.8rem);
}

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

.page-faq .faq-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.85rem;
  align-items: baseline;
  margin-bottom: clamp(0.9rem, 2.5vw, 1.6rem);
}

.page-faq .faq-sec__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--deep);
  background: var(--cyan);
  padding: 0.16rem 0.42rem;
}

.page-faq .faq-sec__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--cloud);
}

.page-faq .faq-sec__lead {
  grid-column: 2;
  margin: 0.5rem 0 0;
  max-width: 36rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ============ 问答条目 ============ */
.page-faq .qa {
  border-top: 1px solid var(--faq-tick);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.95rem 0 0.95rem 1.15rem;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.42;
  color: var(--cloud);
  transition: font-size var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .qa__q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.34s var(--ease);
}

.page-faq .qa[open] .qa__q::before {
  transform: scaleY(1);
}

.page-faq .qa__q:hover {
  font-size: 1.11rem;
  color: var(--cyan);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .qa__qt {
  display: block;
}

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 0.85rem;
  width: 0.85rem;
  height: 0.85rem;
  margin-top: 0.38rem;
  margin-left: auto;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--slate);
  transition: transform 0.3s var(--ease), background var(--dur) var(--ease);
}

.page-faq .qa__mark::before {
  width: 0.85rem;
  height: 1px;
}

.page-faq .qa__mark::after {
  width: 1px;
  height: 0.85rem;
}

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

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

.page-faq .qa__a {
  padding: 0 0 1.2rem 1.15rem;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 34rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ============ 两小时时间示意 ============ */
.page-faq .faq-timeline {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: clamp(0.9rem, 2.5vw, 1.5rem) clamp(0.8rem, 2vw, 1.4rem);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(180deg, rgba(22, 32, 74, 0.9), rgba(22, 32, 74, 0.4));
}

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

.page-faq .faq-timeline text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  fill: var(--slate);
}

.page-faq .faq-timeline__axis {
  stroke: var(--faq-hair);
  stroke-width: 1;
}

.page-faq .faq-timeline__span {
  stroke-width: 3;
}

.page-faq .faq-timeline__span--open {
  stroke: var(--cyan);
}

.page-faq .faq-timeline__span--past {
  stroke: var(--magenta);
  stroke-dasharray: 7 5;
}

.page-faq .faq-timeline__stem {
  stroke: var(--faq-hair);
  stroke-width: 1;
  stroke-dasharray: 3 4;
}

.page-faq .faq-timeline__dot {
  stroke: var(--deep);
  stroke-width: 2;
  transition: stroke var(--dur) var(--ease);
}

.page-faq .faq-timeline__dot--submit {
  fill: var(--cyan);
}

.page-faq .faq-timeline__dot--limit {
  fill: var(--magenta);
}

.page-faq .faq-timeline__dot--start {
  fill: var(--cloud);
}

.page-faq .faq-timeline__node:hover .faq-timeline__dot {
  stroke: var(--cyan);
}

.page-faq .faq-timeline__label {
  font-size: 12px;
}

.page-faq .faq-timeline__label--open {
  fill: var(--cyan);
}

.page-faq .faq-timeline__label--past {
  fill: var(--magenta);
}

.page-faq .faq-timeline figcaption {
  margin-top: 0.9rem;
  max-width: 38rem;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ============ 夜间章节配图 ============ */
.page-faq .faq-sec__figure {
  margin: clamp(1.3rem, 3vw, 1.9rem) 0 0;
  max-width: 22rem;
}

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

/* ============ 协助区块 ============ */
.page-faq .faq-help {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.1rem, 2.5vw, 1.8rem);
  padding: clamp(1.2rem, 3vw, 2rem);
}

.page-faq .faq-help h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--cloud);
}

.page-faq .faq-help p {
  margin: 0 0 0.45rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-faq .faq-help__line {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-help__list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-help__more {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--faq-hair);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-faq .faq-help__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 230, 200, 0.4);
}

.page-faq .faq-help__more a:hover,
.page-faq .faq-help__more a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ============ 断点 ============ */
@media (min-width: 48rem) {
  .page-faq .qa__q {
    font-size: 1.18rem;
  }

  .page-faq .qa__q:hover {
    font-size: 1.23rem;
  }
}

@media (min-width: 52rem) {
  .page-faq .qa {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(1.2rem, 3vw, 2.6rem);
    align-items: start;
  }

  .page-faq .qa__q {
    grid-column: 1;
    grid-row: 1;
    padding-right: 1.4rem;
  }

  .page-faq .qa__a {
    grid-column: 2;
    grid-row: 1;
    padding: 1.15rem 0 1.3rem;
  }

  .page-faq .faq-help {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 60rem) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
  }

  .page-faq .faq-hero__media img {
    aspect-ratio: 2 / 1;
  }
}

@media (min-width: 62rem) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) var(--faq-rail);
    align-items: start;
  }

  .page-faq .faq-flow {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .faq-index {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 2.5rem;
    padding-left: 1rem;
    border-left: 1px solid var(--faq-hair);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0.2rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    border-color: transparent;
    background: none;
    white-space: normal;
    padding-inline: 0.2rem;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-color: transparent;
    transform: translateX(3px);
  }

  .page-faq .faq-sec__figure {
    max-width: 24rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .qa__q,
  .page-faq .qa__q::before,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-timeline__dot {
    transition: none;
  }

  .page-faq .qa__q:hover {
    font-size: inherit;
  }
}