.page-faq {
  --faq-gap: clamp(2rem, 4vw, 3.25rem);
  --faq-radius: 0;
}

.page-faq .shell {
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(3rem, 6vw, 5rem);
}

/* 首屏 */
.page-faq .faq-hero {
  padding-block: clamp(1rem, 2.5vw, 1.75rem) clamp(1.75rem, 4vw, 2.75rem);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero .page-title {
  margin: 0.5rem 0 0.9rem;
  max-width: 22ch;
  font-size: clamp(1.85rem, 4.4vw, 3.2rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.page-faq .faq-hero .lede {
  max-width: 58ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-faq .faq-quick {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(115deg, rgba(22, 18, 43, 0.92), rgba(30, 42, 58, 0.45));
  padding: 14px 16px 16px;
}

.page-faq .faq-quick__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-faq .faq-quick__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-quick__links a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 13.5px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(7, 12, 22, 0.45);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

/* 主体栅格：抽屉目录 + 正文 */
.page-faq .faq-body {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-faq .faq-toc {
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-toc__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted-dim);
  text-transform: uppercase;
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-toc__list li {
  flex: 0 0 auto;
}

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-toc__idx {
  font-size: 11px;
  color: var(--muted-dim);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--text);
  border-color: var(--line);
}

.page-faq .faq-toc__link[aria-current="true"] {
  color: var(--cyan);
  border-color: rgba(53, 224, 208, 0.6);
  background: rgba(53, 224, 208, 0.08);
}

/* 区块 */
.page-faq .faq-sec {
  scroll-margin-top: 5rem;
  padding-block: var(--faq-gap);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-sec__head h2 {
  margin: 0.35rem 0 0.65rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.6vw, 1.95rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-sec__head > p {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.97rem;
}

.page-faq .faq-note {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--line);
  background: rgba(30, 42, 58, 0.35);
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-faq .faq-note a,
.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.4);
}

.page-faq .faq-note a:hover,
.page-faq .qa__a a:hover,
.page-faq .faq-note a:focus-visible,
.page-faq .qa__a a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* 媒体 */
.page-faq .media {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
}

.page-faq .media__frame {
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-faq .media__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted-dim);
}

/* 三步 */
.page-faq .steps {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-faq .steps__item {
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--cyan);
}

.page-faq .steps__num {
  display: block;
  margin-bottom: 8px;
  font-size: clamp(1.55rem, 3.4vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-faq .steps__item h3 {
  margin: 0 0 0.4rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--text);
}

.page-faq .steps__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 检索字段示意 */
.page-faq .fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

.page-faq .fields__box {
  position: relative;
  padding: 15px 16px 17px;
  border: 1px solid var(--line);
  background: rgba(30, 42, 58, 0.4);
}

.page-faq .fields__box::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--cyan);
}

.page-faq .fields__label {
  margin: 0 0 7px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-faq .fields__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 场景卡 */
.page-faq .scenes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-faq .scene {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(232, 184, 106, 0.07), rgba(11, 18, 32, 0.2) 62%);
}

.page-faq .scene__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-faq .scene h3 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--text);
}

.page-faq .scene p {
  margin: 0 0 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 折叠问答 */
.page-faq .topic {
  --topic-color: var(--line);
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
}

.page-faq .topic--search {
  --topic-color: var(--cyan);
}

.page-faq .topic--docs {
  --topic-color: var(--gold);
}

.page-faq .topic--screen {
  --topic-color: var(--focus);
}

.page-faq .topic--download {
  --topic-color: var(--mint);
}

.page-faq .topic__title {
  margin: 0 0 12px;
  padding-left: 10px;
  border-left: 2px solid var(--topic-color);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.16em;
  color: var(--topic-color);
  text-transform: uppercase;
}

.page-faq .qa {
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--topic-color);
  background: rgba(11, 18, 32, 0.55);
  margin-bottom: 8px;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .qa[open] {
  background: rgba(30, 42, 58, 0.5);
  border-color: var(--line);
  border-left-color: var(--topic-color);
}

.page-faq .qa__q {
  list-style: none;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1.45;
  color: var(--topic-color);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--topic-color);
}

.page-faq .qa__a {
  padding: 0 16px 16px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0 0 0.7em;
}

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

/* 大屏区块 */
.page-faq .screen-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-faq .screen-grid .media {
  margin: 0;
}

.page-faq .screen-map {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 18, 43, 0.85), rgba(11, 18, 32, 0.6));
  padding: 14px 16px 16px;
}

.page-faq .screen-map__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted-dim);
}

.page-faq .screen-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .screen-map__box rect {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-faq .screen-map__wire path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-dasharray: 6 6;
}

.page-faq .screen-map__label text {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.page-faq .screen-steps {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .screen-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 11px 14px;
  border: 1px solid var(--line-soft);
  background: rgba(11, 18, 32, 0.4);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .screen-steps .mono {
  color: var(--focus);
  font-size: 12px;
  line-height: 1.9;
}

/* 联系准备清单 */
.page-faq .prep {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .prep__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .prep__idx {
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--coral);
}

.page-faq .prep__item h3 {
  margin: 0 0 0.3rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
}

.page-faq .prep__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .support-card {
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  background: linear-gradient(160deg, rgba(232, 184, 106, 0.08), rgba(11, 18, 32, 0.6) 70%);
  padding: 20px;
  display: grid;
  gap: 18px;
}

.page-faq .support-card__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-faq .support-card__line {
  margin: 0 0 6px;
  font-size: 0.9375rem;
  color: var(--text);
  word-break: break-word;
}

.page-faq .support-card__hint {
  margin: 10px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .support-card .btn {
  justify-self: start;
}

/* 返回顶部 */
.page-faq .to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  display: none;
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text);
  background: rgba(22, 18, 43, 0.94);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .to-top[data-visible="true"] {
  display: block;
}

.page-faq .to-top:hover,
.page-faq .to-top:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-faq a:focus-visible,
.page-faq button:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* 断点 */
@media (min-width: 640px) {
  .page-faq .fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .steps {
    gap: 26px;
  }
}

@media (min-width: 820px) {
  .page-faq .scenes {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 14px;
  }

  .page-faq .screen-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 18px;
  }

  .page-faq .prep {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-faq .support-card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 24px;
  }
}

@media (min-width: 960px) {
  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-faq .steps__item {
    padding: 0 22px;
  }

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

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 6rem;
    align-self: start;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
    padding: 0 12px 0 0;
  }

  .page-faq .faq-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc__list li {
    display: block;
  }

  .page-faq .faq-toc__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 8px 0 8px 14px;
    font-size: 14px;
    white-space: normal;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  }

  .page-faq .faq-toc__link[aria-current="true"] {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 224, 208, 0.12), transparent 80%);
  }

  .page-faq .faq-sec {
    scroll-margin-top: 6rem;
  }

  .page-faq .faq-sec__head > p {
    font-size: 1rem;
  }

  .page-faq .to-top {
    right: 28px;
    bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
</main>