/* ===== 使用教程 / page-faq ===== */
.page-faq {
  --faq-idx-w: 236px;
  --faq-sec-pad: clamp(32px, 5vw, 60px);
  --faq-line: var(--line);
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-cn);
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq :focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 3vw, 34px) 0 clamp(28px, 4vw, 54px);
  border-bottom: var(--hair);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto auto;
  width: min(46%, 560px);
  height: 100%;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(42, 63, 92, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 63, 92, .55) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(120% 90% at 80% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 90% at 80% 0%, #000 0%, transparent 72%);
  opacity: .7;
}

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

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(22px, 3.5vw, 40px);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-size: clamp(28px, 4.6vw, 54px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--white);
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}

.page-faq .faq-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: var(--hair);
}

.page-faq .faq-hero__num {
  flex: 0 0 auto;
  min-width: 3.6em;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--orange);
}

.page-faq .faq-hero__fact:nth-child(2) .faq-hero__num {
  color: var(--cyan);
}

.page-faq .faq-hero__fact:nth-child(3) .faq-hero__num {
  color: var(--blue);
}

.page-faq .faq-hero__lab {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 100px);
}

/* ---------- 左索引 ---------- */
.page-faq .faq-index {
  border-top: var(--hair);
  border-bottom: var(--hair);
  padding: 18px 0;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-faq .faq-idx__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px;
  border: var(--hair);
  border-left: 2px solid transparent;
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-idx__item:hover,
.page-faq .faq-idx__item:focus-visible {
  border-left-color: var(--orange);
  background-color: rgba(255, 107, 53, .08);
  color: var(--white);
}

.page-faq .faq-idx__num {
  font-size: 11px;
  color: var(--orange);
  letter-spacing: .08em;
}

.page-faq .faq-index__sub {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__sub-link {
  display: block;
  padding: 7px 0 7px 16px;
  position: relative;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .faq-index__sub-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background-color: var(--line);
  transition: width .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-index__sub-link:hover,
.page-faq .faq-index__sub-link:focus-visible {
  color: var(--cyan);
  padding-left: 22px;
}

.page-faq .faq-index__sub-link:hover::before,
.page-faq .faq-index__sub-link:focus-visible::before {
  width: 14px;
  background-color: var(--cyan);
}

/* ---------- 内容流 ---------- */
.page-faq .faq-sec {
  padding: clamp(30px, 4.5vw, 56px) 0;
  border-top: var(--hair);
}

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

.page-faq .faq-head {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-head__num {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange);
  padding-top: 8px;
  border-top: 2px solid var(--orange);
}

.page-faq .faq-head__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--white);
}

.page-faq .faq-head__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-faq .faq-head__note {
  position: absolute;
  right: 0;
  top: 6px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--muted);
  border-left: var(--hair);
  padding-left: 6px;
}

/* ---------- 流程线 ---------- */
.page-faq .faq-flowline {
  display: block;
  width: 100%;
  height: 18px;
  margin-bottom: 14px;
}

/* ---------- 步骤 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .steps__item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: var(--hair);
}

.page-faq .steps__num {
  position: relative;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-faq .steps__time {
  position: absolute;
  left: 0;
  top: 100%;
  margin-top: 8px;
  white-space: nowrap;
  font-size: 10px;
  letter-spacing: .08em;
  padding: 2px 7px;
  color: var(--orange-soft);
  background-color: rgba(255, 107, 53, .16);
  border: 1px solid rgba(255, 107, 53, .55);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  z-index: 3;
  transition: opacity .18s var(--ease), transform .18s var(--ease);
}

.page-faq .steps__item:hover .steps__time,
.page-faq .steps__item:focus-within .steps__time {
  opacity: 1;
  transform: translateY(0);
}

.page-faq .steps__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 问答 ---------- */
.page-faq .qa-group {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .qa {
  border-top: var(--hair);
}

.page-faq .qa:last-of-type {
  border-bottom: var(--hair);
}

.page-faq .qa__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 2px 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

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

.page-faq .qa__q:hover {
  color: var(--white);
  padding-left: 6px;
}

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background-color: var(--orange);
  transition: transform .25s var(--ease), background-color .25s var(--ease);
}

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

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

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

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

.page-faq .qa__a {
  padding: 0 0 20px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
  animation: faq-open .26s var(--ease) both;
}

.page-faq .qa__a p {
  margin: 0 0 10px;
}

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

.page-faq .qa__steps,
.page-faq .qa__list {
  margin: 0;
  padding-left: 20px;
}

.page-faq .qa__steps li,
.page-faq .qa__list li {
  margin-bottom: 8px;
  padding-left: 4px;
}

.page-faq .qa__steps {
  list-style: decimal;
}

.page-faq .qa__list {
  list-style: square;
}

.page-faq .qa__steps li::marker,
.page-faq .qa__list li::marker {
  color: var(--cyan);
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border: var(--hair);
  background-color: var(--panel);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  background-color: var(--ink-deep);
  border-top: var(--hair);
}

/* ---------- 阶梯 ---------- */
.page-faq .ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}

.page-faq .ladder__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: var(--hair);
  transition: background-color .2s var(--ease);
}

.page-faq .ladder__item:hover {
  background-color: rgba(20, 41, 74, .55);
}

.page-faq .ladder__step {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--orange);
  padding-top: 4px;
}

.page-faq .ladder__tick {
  display: block;
  height: 3px;
  width: 14px;
  margin-bottom: 12px;
  background-color: var(--orange);
  transition: width .25s var(--ease);
}

.page-faq .ladder__item:nth-child(2) .ladder__tick { width: 26px; }
.page-faq .ladder__item:nth-child(3) .ladder__tick { width: 38px; background-color: #FF8A5B; }
.page-faq .ladder__item:nth-child(4) .ladder__tick { width: 50px; background-color: var(--cyan); }
.page-faq .ladder__item:nth-child(5) .ladder__tick { width: 62px; background-color: var(--cyan); }
.page-faq .ladder__item:nth-child(6) .ladder__tick { width: 74px; background-color: var(--blue); }

.page-faq .ladder__title {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.6;
  font-weight: 700;
  color: var(--white);
}

.page-faq .ladder__text {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 主题分类 ---------- */
.page-faq .topics {
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: var(--hair);
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-faq .topics__col {
  background-color: var(--ink);
  padding: 20px 18px 22px;
}

.page-faq .topics__name {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-faq .topics__n {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-faq .topics__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .topics__list li {
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px dashed rgba(42, 63, 92, .9);
}

.page-faq .topics__list li:first-child {
  border-top: 0;
}

/* ---------- 正文补充 ---------- */
.page-faq .faq-note {
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-faq .faq-note p {
  margin: 0 0 16px;
  max-width: 72ch;
}

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

/* ---------- 联系 ---------- */
.page-faq .ask-grid {
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
}

.page-faq .ask-card {
  border: var(--hair);
  border-top: 2px solid var(--orange);
  background-color: var(--panel);
  padding: 22px 20px 24px;
}

.page-faq .ask-card + .ask-card {
  border-top-color: var(--cyan);
}

.page-faq .ask-card__title {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-faq .ask-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .ask-card__list li {
  padding: 8px 0 8px 16px;
  position: relative;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  border-top: 1px dashed rgba(42, 63, 92, .9);
  word-break: break-word;
}

.page-faq .ask-card__list li:first-child {
  border-top: 0;
}

.page-faq .ask-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 1px;
  background-color: var(--orange);
}

.page-faq .ask-card__list--contact li::before {
  background-color: var(--cyan);
}

.page-faq .ask-card__k {
  display: inline-block;
  min-width: 5.4em;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-faq .ask-cta {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-layout {
    padding-top: clamp(32px, 4vw, 52px);
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .ask-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-faq .topics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-head {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 18px;
  }

  .page-faq .steps__item {
    grid-template-columns: 62px minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-hero__facts {
    padding-bottom: 6px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    border-bottom: 0;
    padding: 0;
  }

  .page-faq .faq-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    margin-bottom: 26px;
  }

  .page-faq .faq-idx__item {
    border: 0;
    border-top: var(--hair);
    border-left: 2px solid transparent;
    padding: 12px 10px 12px 14px;
  }

  .page-faq .faq-idx__item:last-child {
    border-bottom: var(--hair);
  }
}

@media (min-width: 1100px) {
  .page-faq .topics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-faq .faq-head__note {
    display: none;
  }

  .page-faq .faq-hero__num {
    min-width: 3em;
    font-size: 18px;
  }

  .page-faq .steps__item,
  .page-faq .ladder__item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
  }

  .page-faq .faq-idx__item {
    padding: 10px 9px;
    font-size: 12.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}