.page-faq {
  --faq-card: var(--lift);
  --faq-soft: var(--ink-soft);
  --faq-shadow: var(--shadow-hard);
  color: var(--graphite);
  background: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(44px, 6vw, 76px);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--snow) 1.3px, transparent 1.4px);
  background-size: 24px 24px;
  opacity: 0.7;
  pointer-events: none;
}

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

.page-faq .faq-hero__kicker {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist-ink);
}

.page-faq .faq-hero__title {
  margin: 14px 0 clamp(22px, 4vw, 34px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 8.4vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  max-width: 15ch;
}

.page-faq .faq-hero__cols {
  display: grid;
  gap: 26px;
}

.page-faq .faq-hero__lead {
  max-width: 34em;
  margin: 0;
}

.page-faq .faq-hero__aside {
  display: grid;
  gap: 14px;
  align-content: start;
  justify-items: start;
  padding: clamp(18px, 3vw, 24px);
  background: var(--faq-card);
  border: var(--line) solid var(--graphite);
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-hero__aside-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-ink);
  border-bottom: 3px solid var(--amber);
  padding-bottom: 6px;
}

.page-faq .faq-hero__aside-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--faq-soft);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 16px;
  background: var(--snow);
  border: 2px solid var(--graphite);
  font-size: 14px;
}

.page-faq .faq-hero__stats .mono {
  font-size: 22px;
  font-weight: 600;
}

/* ---------- 工作台 ---------- */
.page-faq .faq-desk {
  padding-bottom: clamp(44px, 6vw, 88px);
}

.page-faq .faq-desk__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: var(--line) solid var(--graphite);
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.15;
}

.page-faq .faq-desk__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
}

.page-faq .faq-body {
  min-width: 0;
}

/* ---------- 分类锚点列 ---------- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist-ink);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list > li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--faq-card);
  border: 2px solid var(--graphite);
  color: var(--graphite);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: var(--signal);
  box-shadow: var(--shadow-sm);
  transform: translate(-2px, -2px);
}

.page-faq .faq-rail__num,
.page-faq .faq-rail__count {
  font-size: 12px;
  color: var(--mist-ink);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  border-left: 6px solid var(--group, var(--signal));
  padding-left: clamp(14px, 2.4vw, 24px);
  margin-bottom: clamp(38px, 5vw, 64px);
  scroll-margin-top: 24px;
}

.page-faq .faq-group--entry { --group: var(--signal); }
.page-faq .faq-group--install { --group: var(--mist); }
.page-faq .faq-group--migrate { --group: var(--amber); }
.page-faq .faq-group--version { --group: var(--mist-ink); }
.page-faq .faq-group--export { --group: var(--signal); }
.page-faq .faq-group--change { --group: var(--coral); }

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: var(--line) solid var(--graphite);
  margin-bottom: 8px;
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  padding: 5px 8px;
  background: var(--graphite);
  color: var(--paper);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.15;
}

.page-faq .faq-group__meta {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist-ink);
}

/* ---------- 手风琴 ---------- */
.page-faq .qa {
  border-bottom: 2px solid var(--snow);
}

.page-faq .qa:last-child {
  border-bottom: 0;
}

.page-faq .qa__q {
  display: block;
  position: relative;
  padding: 18px 46px 18px 2px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--graphite);
  cursor: pointer;
  list-style: none;
  transition: color 0.18s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  color: var(--group, var(--signal));
}

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

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

.page-faq .qa__a {
  padding: 0 6px 22px 2px;
}

.page-faq .qa__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .qa__steps li {
  position: relative;
  padding-left: 32px;
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .qa__steps li::before {
  content: counter(step);
  counter-increment: step;
  position: absolute;
  left: 0;
  top: 4px;
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  background: var(--graphite);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
}

.page-faq .qa__steps { counter-reset: step; }

.page-faq .qa__why {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--mist);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-ink);
}

.page-faq .qa__why a {
  color: var(--mist-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 换机分组配图 ---------- */
.page-faq .faq-migrate {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-faq .faq-migrate__items {
  min-width: 0;
}

.page-faq .faq-migrate__media {
  min-width: 0;
}

.page-faq .faq-shot {
  border: 2px solid var(--graphite);
  box-shadow: var(--shadow-sm);
  background: var(--snow);
  overflow: hidden;
}

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

.page-faq .media-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist-ink);
}

/* ---------- 导出演示 ---------- */
.page-faq .faq-export__lead {
  margin: 18px 0 24px;
  font-size: 17px;
  line-height: 1.8;
  max-width: 60ch;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-step {
  position: relative;
  padding: 18px 18px 16px 64px;
  background: var(--faq-card);
  border: 2px solid var(--graphite);
  box-shadow: var(--shadow-sm);
}

.page-faq .faq-step__num {
  position: absolute;
  left: 16px;
  top: 16px;
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--signal-ink);
}

.page-faq .faq-step__title {
  margin: 0 0 6px;
  font-family: var(--font-ui);
  font-size: 17px;
  font-weight: 700;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--faq-soft);
}

.page-faq .faq-figure {
  margin: 0 0 26px;
}

.page-faq .faq-export__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-faq .faq-export__sub {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--graphite);
}

.page-faq .faq-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-faq .faq-fields li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  background: var(--faq-card);
  border: 2px solid var(--graphite);
  font-family: var(--font-mono);
  font-size: 15px;
}

.page-faq .faq-fields li span {
  font-size: 12px;
  color: var(--mist-ink);
}

.page-faq .faq-errors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-errors li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--faq-soft);
}

.page-faq .faq-errors li::before {
  content: "×";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--coral);
}

/* ---------- 写信提示卡 ---------- */
.page-faq .faq-help {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-faq .faq-help__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: clamp(22px, 4vw, 44px);
  background: var(--graphite);
  color: var(--paper);
  border: var(--line) solid var(--graphite);
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-help__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-help__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--snow);
  max-width: 52ch;
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-help__list li {
  padding: 6px 0 6px 14px;
  border-left: 3px solid var(--signal);
  font-size: 15px;
  line-height: 1.72;
  color: var(--snow);
}

.page-faq .faq-help__list strong {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .faq-help__side {
  display: grid;
  gap: 10px;
  align-content: start;
  justify-items: start;
  padding: 20px;
  border: 2px solid var(--snow);
  background: rgba(250, 247, 240, 0.05);
}

.page-faq .faq-help__side-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-help__side-strong {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .faq-help__side-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--snow);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-faq .faq-export__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-desk__grid {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 20px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-top: 2px solid var(--graphite);
  }

  .page-faq .faq-rail__list > li {
    display: block;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    padding: 12px 6px 12px 12px;
    border: 0;
    border-bottom: 2px solid var(--snow);
    border-left: 4px solid transparent;
    background: transparent;
    white-space: normal;
    box-shadow: none;
    transition: border-color 0.18s var(--ease), padding-left 0.18s var(--ease), color 0.18s var(--ease);
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    background: transparent;
    border-left-color: var(--signal);
    padding-left: 18px;
    box-shadow: none;
    transform: none;
  }

  .page-faq .faq-rail__count {
    margin-left: auto;
  }

  .page-faq .faq-help__card {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-migrate {
    grid-template-columns: minmax(0, 1fr) 248px;
    gap: 28px;
    align-items: start;
  }

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

  .page-faq .faq-migrate__media {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 20px;
  }
}

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

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    transform: none;
  }
}