.page-faq {
  --topic: var(--cyan);
  --faq-pad: clamp(16px, 4vw, 32px);
  --faq-gap: 20px;
  background: var(--ink);
  color: var(--text);
}

.page-faq .wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--faq-pad);
}

.page-faq .breadcrumb {
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 28px 0 40px;
  border-bottom: var(--frame) solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -10px;
  right: -10px;
  width: 62%;
  height: 58%;
  background: linear-gradient(140deg, rgba(34, 211, 238, 0.16), rgba(240, 180, 41, 0) 72%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 84%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero-copy,
.page-faq .faq-hero-media {
  position: relative;
  z-index: 1;
}

.page-faq .faq-h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 7.6vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero-media {
  margin: 0;
  aspect-ratio: 2 / 1;
  border: var(--frame) solid var(--line);
  border-radius: var(--r-l);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 40px;
}

/* ---------- 左侧主题索引 ---------- */
.page-faq .faq-index {
  border: var(--frame) solid var(--line);
  border-radius: var(--r-m);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  padding: 20px;
}

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--archive);
}

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

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

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 4px;
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: color 0.18s ease, transform 0.18s ease;
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-faq .faq-index-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  padding-bottom: 36px;
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-group--login { --topic: var(--green); }
.page-faq .faq-group--register { --topic: var(--cyan); }
.page-faq .faq-group--subscribe { --topic: var(--gold); }
.page-faq .faq-group--network { --topic: var(--archive); }
.page-faq .faq-group--contact { --topic: var(--cyan); }

.page-faq .faq-group-head .section-kicker {
  color: var(--topic);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin: 0;
}

.page-faq .faq-group-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 50px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-faq .faq-group-lede {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-list {
  margin-top: 24px;
}

/* ---------- 折叠问答卡片 ---------- */
.page-faq .faq-item {
  display: block;
  margin-bottom: 12px;
  background: var(--panel);
  border-left: 4px solid var(--topic);
  border-radius: var(--r-m);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-faq .faq-item:hover {
  transform: translateY(-2px);
}

.page-faq .faq-item[open] {
  box-shadow: var(--shadow-cyan);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.5;
  color: var(--text);
}

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

.page-faq .faq-q::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--topic);
  transition: transform 0.2s ease;
}

.page-faq .faq-item[open] .faq-q::after {
  transform: rotate(45deg);
}

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

.page-faq .faq-a {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--line);
  overflow: hidden;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-item[open] .faq-a {
  animation: faq-unfold 0.26s cubic-bezier(0.2, 0.7, 0.3, 1) both;
}

@keyframes faq-unfold {
  from { max-height: 0; }
  to { max-height: 520px; }
}

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

.page-faq .faq-a p + p {
  margin-top: 10px;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 12px 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-steps li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-faq .faq-steps .index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--topic);
}

/* ---------- 弱网与多端：图文并排 ---------- */
.page-faq .faq-group-body--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-faq .faq-side-media {
  margin: 24px 0 0;
  aspect-ratio: 5 / 4;
  border: var(--frame) solid var(--line);
  border-radius: var(--r-l);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-side-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 相关入口 ---------- */
.page-faq .faq-bridges {
  padding: 40px 0 8px;
  border-top: var(--frame) solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-bridge-grid {
  margin-top: 24px;
}

.page-faq .faq-bridge {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: var(--frame) solid var(--line);
  border-radius: var(--r-m);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-bridge:hover,
.page-faq .faq-bridge:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-faq .faq-bridge .index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--archive);
}

.page-faq .faq-bridge-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 20px;
  letter-spacing: 0.01em;
}

.page-faq .faq-bridge-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
    padding: 48px 0 56px;
  }

  .page-faq .faq-hero-media {
    margin: 0;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: 256px minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 88px;
    align-self: start;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-group-body--split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }

  .page-faq .faq-side-media {
    margin-top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-bridge,
  .page-faq .faq-index-link {
    transition: none;
  }

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