.page-faq {
  --faq-rail-w: 248px;
  --faq-hero-pad: 40px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: var(--faq-hero-pad) 0 72px;
  background: linear-gradient(146deg, var(--ml-night) 0%, var(--ml-ink) 100%);
  color: #fff;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: auto -20% -40% 42%;
  height: 150%;
  background: linear-gradient(118deg, rgba(30, 144, 255, .30), rgba(255, 107, 53, .14));
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-faq .faq-crumb {
  margin-bottom: 26px;
}

.page-faq .faq-crumb .ml-breadcrumb__link,
.page-faq .faq-crumb .ml-breadcrumb__item {
  color: var(--ml-text-on-night);
}

.page-faq .faq-crumb .ml-breadcrumb__link:hover {
  color: #fff;
}

.page-faq .faq-crumb .ml-breadcrumb__current {
  color: #fff;
}

.page-faq .faq-crumb__sep {
  opacity: .5;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ml-orange);
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-size: clamp(30px, 6.4vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: #fff;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ml-text-on-night);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-faq .faq-hero__media {
  margin: 0;
  border-radius: var(--ml-radius);
  overflow: hidden;
  border: 1px solid rgba(220, 235, 255, .2);
  background: rgba(220, 235, 255, .06);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 三摞文件夹 ---------- */

.page-faq .faq-guide {
  background: var(--ml-white);
}

.page-faq .faq-guide__head {
  max-width: 720px;
}

.page-faq .faq-folders {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 38px;
}

.page-faq .faq-folder {
  position: relative;
  display: block;
  padding: 32px 22px 24px;
  background: #fff;
  border: 1px solid var(--ml-line);
  border-left: 5px solid var(--faq-accent, var(--ml-blue));
  border-radius: var(--ml-radius);
  text-decoration: none;
  color: inherit;
  transition: transform .25s var(--ml-ease), box-shadow .25s var(--ml-ease);
}

.page-faq .faq-folder::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 76px;
  height: 5px;
  background: var(--faq-accent, var(--ml-blue));
  transition: width .32s var(--ml-ease);
}

.page-faq .faq-folder:hover,
.page-faq .faq-folder:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--ml-shadow);
}

.page-faq .faq-folder:hover::before,
.page-faq .faq-folder:focus-visible::before {
  width: 100%;
}

.page-faq .faq-folder--usage {
  --faq-accent: var(--ml-blue);
}

.page-faq .faq-folder--data {
  --faq-accent: var(--ml-orange);
}

.page-faq .faq-folder--feedback {
  --faq-accent: var(--ml-red);
}

.page-faq .faq-folder__tab {
  display: inline-block;
  padding: 3px 11px;
  border-radius: 3px 10px 3px 3px;
  background: var(--faq-accent, var(--ml-blue));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
}

.page-faq .faq-folder__num {
  display: block;
  margin: 14px 0 2px;
  font-family: var(--ml-font-mono);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--faq-accent, var(--ml-blue));
}

.page-faq .faq-folder__name {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--ml-night);
}

.page-faq .faq-folder__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ml-text);
}

.page-faq .faq-folder__go {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--faq-accent, var(--ml-blue));
  border-bottom: 2px solid currentColor;
  padding-bottom: 2px;
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  background: var(--ml-white);
  padding: 8px 0 72px;
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--ml-header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: 72px;
}

.page-faq .faq-group--usage {
  --faq-accent: var(--ml-blue);
}

.page-faq .faq-group--data {
  --faq-accent: var(--ml-orange);
}

.page-faq .faq-group--feedback {
  --faq-accent: var(--ml-red);
}

.page-faq .faq-group__head {
  max-width: 68ch;
  margin-bottom: 20px;
}

.page-faq .faq-group__bar {
  display: block;
  width: 46px;
  height: 6px;
  margin-bottom: 14px;
  border-radius: 3px;
  background: var(--faq-accent, var(--ml-blue));
}

.page-faq .faq-group__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ml-night);
}

.page-faq .faq-group__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ml-text);
}

.page-faq .faq-figure {
  margin: 0 0 22px;
  border-radius: var(--ml-radius);
  overflow: hidden;
  border: 1px solid var(--ml-line);
  background: var(--ml-mist);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-faq .faq-figure__caption {
  padding: 10px 16px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ml-muted);
  background: #fff;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-group__list {
  padding: 4px 20px;
  background: #fff;
  border: 1px solid var(--ml-line);
  border-radius: var(--ml-radius);
}

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

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

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 2px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ml-night);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

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

.page-faq .faq-item__toggle {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ml-white);
  border: 1px solid var(--ml-line-strong);
  transition: background .22s var(--ml-ease), border-color .22s var(--ml-ease);
}

.page-faq .faq-item__toggle::before,
.page-faq .faq-item__toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 2px;
  border-radius: 1px;
  background: var(--faq-accent, var(--ml-blue));
  transform: translate(-50%, -50%);
  transition: transform .22s var(--ml-ease), opacity .22s var(--ml-ease), background .22s var(--ml-ease);
}

.page-faq .faq-item__toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__toggle {
  background: var(--faq-accent, var(--ml-blue));
  border-color: var(--faq-accent, var(--ml-blue));
}

.page-faq .faq-item[open] .faq-item__toggle::before {
  background: #fff;
}

.page-faq .faq-item[open] .faq-item__toggle::after {
  background: #fff;
  opacity: 0;
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq .faq-item__a {
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 3px solid var(--faq-accent, var(--ml-blue));
  max-width: 68ch;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ml-text);
}

/* ---------- 粘性分类标签 ---------- */

.page-faq .faq-rail {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  border-radius: var(--ml-radius);
  background: var(--ml-night);
  overflow-x: auto;
}

.page-faq .faq-rail__title {
  display: none;
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--ml-text-on-night);
}

.page-faq .faq-rail__link {
  display: flex;
  flex: 0 0 auto;
  align-items: baseline;
  gap: 10px;
  padding: 9px 14px;
  border-radius: var(--ml-radius-sm);
  border-left: 3px solid transparent;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background .2s var(--ml-ease), border-color .2s var(--ml-ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: rgba(220, 235, 255, .12);
}

.page-faq .faq-rail__link--usage {
  border-left-color: var(--ml-blue);
}

.page-faq .faq-rail__link--data {
  border-left-color: var(--ml-orange);
}

.page-faq .faq-rail__link--feedback {
  border-left-color: var(--ml-red);
}

.page-faq .faq-rail__num {
  display: none;
  margin-left: auto;
  font-family: var(--ml-font-mono);
  font-size: 13px;
  color: var(--ml-text-on-night);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  position: relative;
  overflow: hidden;
  padding: 64px 0 68px;
  background: linear-gradient(140deg, var(--ml-ink) 0%, var(--ml-night) 100%);
  color: #fff;
}

.page-faq .faq-outro::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto 55%;
  height: 160%;
  background: linear-gradient(120deg, rgba(255, 107, 53, .22), rgba(30, 144, 255, .08));
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-faq .faq-outro__inner {
  position: relative;
}

.page-faq .faq-outro__eyebrow {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ml-orange);
}

.page-faq .faq-outro__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: #fff;
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ml-text-on-night);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-outro__meta {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--ml-text-on-night);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-folders {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-group__list {
    padding: 4px 28px;
  }

  .page-faq .faq-figure img {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 900px) {
  .page-faq {
    --faq-hero-pad: 56px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 56px;
    align-items: center;
  }

  .page-faq .faq-hero {
    padding-bottom: 96px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body__grid {
    grid-template-columns: minmax(0, 1fr) var(--faq-rail-w);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-body__side {
    position: sticky;
    top: calc(var(--ml-header-h) + 20px);
  }

  .page-faq .faq-rail {
    display: block;
    overflow: visible;
    padding: 20px 18px;
  }

  .page-faq .faq-rail__title {
    display: block;
    margin-bottom: 14px;
  }

  .page-faq .faq-rail__link {
    margin-bottom: 4px;
    padding: 11px 12px;
    border-left: 3px solid transparent;
    white-space: normal;
  }

  .page-faq .faq-rail__num {
    display: inline;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body__grid {
    gap: 64px;
  }
}