/* ============================================
   问题解答 /questions/
   ============================================ */

.page-faq {
  --faq-radius: 2px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-block: clamp(1.5rem, 5vw, 3rem) clamp(1.25rem, 3vw, 2.25rem);
}

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

.page-faq .faq-hero__title {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 8vw, 3.9rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__title-sub {
  display: block;
  margin-top: 0.75rem;
  font-family: var(--font-sans);
  font-size: clamp(0.8rem, 1.7vw, 0.98rem);
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-hero .lede {
  margin: clamp(1rem, 2.4vw, 1.4rem) 0 0;
  max-width: 54ch;
  font-size: clamp(0.95rem, 1.7vw, 1.05rem);
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 关键数字 ---------- */
.page-faq .faq-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
}

.page-faq .faq-fact {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.72rem 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-fact:first-child {
  border-top: 1px solid var(--line);
}

.page-faq .faq-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--tier-1);
}

.page-faq .faq-fact:nth-child(2) .faq-fact__num { color: var(--tier-3); }
.page-faq .faq-fact:nth-child(3) .faq-fact__num { color: var(--tier-5); }

.page-faq .faq-fact:nth-child(4) .faq-fact__num {
  font-size: clamp(0.92rem, 2vw, 1.08rem);
  letter-spacing: 0.02em;
  color: var(--tier-7);
}

.page-faq .faq-fact__label {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 筛选 ---------- */
.page-faq .faq-toolbar {
  display: grid;
  gap: 0.55rem;
  padding-top: clamp(0.9rem, 2.5vw, 1.35rem);
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-filters {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-filters::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-tab {
  flex: none;
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.81rem;
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    color 0.25s var(--ease-out),
    border-color 0.25s var(--ease-out),
    background 0.25s var(--ease-out);
}

.page-faq .faq-tab:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

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

.page-faq .faq-tab.is-active,
.page-faq .faq-tab[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-status {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 0.55rem;
  margin-top: clamp(1.1rem, 3vw, 1.75rem);
}

.page-faq .faq-item {
  --accent: var(--cyan);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: var(--faq-radius);
  background: var(--panel);
  transition:
    background 0.3s var(--ease-out),
    border-color 0.3s var(--ease-out);
}

.page-faq .faq-item[data-filter-tags~="limit"]   { --accent: var(--tier-1); }
.page-faq .faq-item[data-filter-tags~="demo"]    { --accent: var(--tier-3); }
.page-faq .faq-item[data-filter-tags~="terms"]   { --accent: var(--tier-5); }
.page-faq .faq-item[data-filter-tags~="contact"] { --accent: var(--tier-7); }

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  background: var(--panel-2);
  border-color: var(--line-strong);
}

.page-faq .faq-item[open] {
  border-left-color: var(--accent);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1.05rem;
  list-style: none;
  cursor: pointer;
  color: var(--text);
}

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

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

.page-faq .faq-item__idx {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-faq .faq-item__text {
  font-size: clamp(0.96rem, 1.7vw, 1.06rem);
  font-weight: 500;
  line-height: 1.55;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--muted);
  transition:
    transform 0.3s var(--ease-out),
    background 0.3s var(--ease-out);
}

.page-faq .faq-item__mark::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: rotate(0deg);
}

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--accent);
}

.page-faq .faq-item__a {
  padding: 0.95rem 1.05rem 1.2rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 视觉区 ---------- */
.page-faq .faq-visual {
  margin: clamp(2rem, 6vw, 3.5rem) 0 0;
}

.page-faq .faq-visual .figure__frame {
  border-radius: var(--faq-radius);
  overflow: hidden;
}

/* ---------- 联系收尾 ---------- */
.page-faq .faq-next {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
}

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

.page-faq .faq-next h2 {
  margin: 0.45rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  font-weight: 600;
  line-height: 1.12;
  color: var(--paper);
}

.page-faq .faq-next__body > p {
  margin: clamp(0.9rem, 2vw, 1.2rem) 0 0;
  max-width: 52ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--body-text);
}

.page-faq .faq-contact {
  margin: clamp(1.1rem, 2.6vw, 1.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact li {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-contact li:first-child {
  border-top: 1px solid var(--line);
}

.page-faq .faq-contact__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-faq .faq-contact__val {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-faq .faq-next__cta {
  margin-top: clamp(1.2rem, 3vw, 1.7rem);
}

.page-faq .faq-next__figure {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-next__figure .figure__frame {
  border-radius: var(--faq-radius);
  overflow: hidden;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-contact li {
    grid-template-columns: 6rem minmax(0, 1fr);
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-faq .faq-toolbar {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-faq .faq-item__q {
    padding: 1.1rem 1.25rem;
  }

  .page-faq .faq-item__a {
    padding: 1rem 1.25rem 1.35rem;
  }

  .page-faq .faq-item__a p {
    max-width: 78ch;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-next {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }
}
</main>