/* ===== 常见问题页 · page-faq ===== */

.page-faq {
  --faq-on-paper: #16233F;
  --faq-on-paper-muted: #55617A;
  --faq-on-paper-accent: #0B7F76;
  padding: 28px 0 80px;
}

.page-faq .breadcrumb {
  margin-bottom: 22px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7.2vw, 3.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: .02em;
  color: var(--text);
  margin: 12px 0 14px;
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.page-faq .faq-fact__k {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-faq .faq-fact__v {
  font-family: var(--font-mono);
  font-size: .9375rem;
  letter-spacing: .04em;
  color: var(--amber);
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-layout {
  margin-top: 34px;
}

/* ---------- 主题索引（移动端为吸顶横滑条） ---------- */

.page-faq .faq-index {
  position: sticky;
  top: calc(var(--mast-h) + 6px);
  z-index: 3;
  background: var(--ink);
  padding: 10px 0 8px;
  margin-bottom: 6px;
}

.page-faq .faq-index__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  font-size: .875rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--cyan);
  letter-spacing: .04em;
}

/* ---------- 问题分组 ---------- */

.page-faq .faq-group {
  margin-top: 34px;
  scroll-margin-top: calc(var(--mast-h) + 72px);
}

.page-faq .faq-group:first-child {
  margin-top: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}

/* ---------- 分组配图 ---------- */

.page-faq .faq-group__media {
  margin: 0 0 16px;
}

.page-faq .faq-group__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.page-faq .faq-group__media .media__caption {
  margin-top: 8px;
  font-size: .8125rem;
  color: var(--muted);
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-item {
  margin-bottom: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--paper);
  border-color: var(--paper-stripe);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: 1.45;
  letter-spacing: .01em;
  color: var(--text);
  transition: color 180ms var(--ease);
}

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

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

.page-faq .faq-num {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-q__text {
  flex: 1 1 auto;
}

.page-faq .faq-q__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 4px;
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-q__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-q {
  color: var(--faq-on-paper);
}

.page-faq .faq-item[open] .faq-num {
  color: var(--faq-on-paper-accent);
}

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

.page-faq .faq-item[open] .faq-q__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

/* ---------- 答案 ---------- */

.page-faq .faq-a {
  padding: 0 16px 18px 40px;
  color: var(--faq-on-paper-muted);
  font-size: .9375rem;
  line-height: 1.75;
}

.page-faq .faq-a p {
  margin: 0;
}

.page-faq .faq-a a {
  color: var(--faq-on-paper-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--faq-on-paper);
}

.page-faq .faq-figure {
  margin: 14px 0 4px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--paper-stripe);
}

.page-faq .faq-figure .media__caption {
  margin-top: 8px;
  font-size: .8125rem;
  color: var(--faq-on-paper-muted);
}

.page-faq .faq-item[open] .faq-a {
  animation: faqAnswerIn 260ms var(--ease) both;
}

@keyframes faqAnswerIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 联系动作 ---------- */

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 页尾提示 ---------- */

.page-faq .faq-cta {
  position: relative;
  margin-top: 56px;
  padding: 26px 22px;
  background: linear-gradient(135deg, var(--night) 0%, var(--panel) 62%, rgba(139, 92, 246, .22) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-cta::after {
  content: "";
  position: absolute;
  inset: auto -60px -90px auto;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(53, 230, 216, .18), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-cta h2 {
  position: relative;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.6vw, 1.7rem);
  letter-spacing: .02em;
  color: var(--text);
}

.page-faq .faq-cta p {
  position: relative;
  margin: 0 0 16px;
  max-width: 58ch;
  color: var(--muted);
  line-height: 1.75;
}

.page-faq .faq-cta .btn {
  position: relative;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 900px) {
  .page-faq {
    padding: 36px 0 96px;
  }

  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    margin-top: 44px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--mast-h) + 24px);
    z-index: 1;
    background: transparent;
    padding: 0;
    margin-bottom: 0;
  }

  .page-faq .faq-index__title {
    font-size: .6875rem;
    margin-bottom: 14px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__list li {
    flex: none;
  }

  .page-faq .faq-index__list a {
    display: flex;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
    line-height: 1.4;
  }

  .page-faq .faq-index__list a:hover,
  .page-faq .faq-index__list a:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 230, 216, .1), transparent 72%);
  }

  .page-faq .faq-group {
    margin-top: 42px;
    scroll-margin-top: calc(var(--mast-h) + 24px);
  }

  .page-faq .faq-q {
    padding: 16px 20px;
    font-size: 1.125rem;
  }

  .page-faq .faq-a {
    padding: 0 20px 20px 54px;
    font-size: 1rem;
  }

  .page-faq .faq-cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
    padding: 32px 36px;
  }

  .page-faq .faq-cta h2 {
    margin-bottom: 6px;
  }

  .page-faq .faq-cta p {
    margin-bottom: 0;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-q,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-index__list a {
    transition: none;
  }

  .page-faq .faq-item[open] .faq-a {
    animation: none;
  }
}