.page-faq {
  --faq-index-w: 200px;
  padding-bottom: 84px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.page-faq h1 {
  font-family: var(--font-head);
  font-size: clamp(30px, 7.4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 10px 0 16px;
  max-width: 20ch;
}

.page-faq .faq-hero__lede .lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 46ch;
}

.page-faq .faq-hero__lede .note {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding-left: 12px;
  max-width: 46ch;
}

.page-faq .faq-hero__panel {
  background: var(--zone);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  padding: 18px 18px 8px;
}

.page-faq .faq-hero__panel-title {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 6px;
}

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

.page-faq .faq-hero__list li {
  display: grid;
  gap: 3px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-hero__k {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-hero__v {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-2);
}

.page-faq .faq-hero__media {
  margin: 24px 0 40px;
}

.page-faq .faq-hero__media .media__img,
.page-faq .faq-flowchart__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .media__caption {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 32px;
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 43, 51, 0.9), rgba(8, 24, 43, 0.4));
  padding: 16px 14px 14px;
}

.page-faq .faq-index__title {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__nav {
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 4px 10px 12px;
  border-left: 1px solid var(--line);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--cyan);
  color: var(--ink);
  background: rgba(47, 243, 208, 0.06);
}

.page-faq .faq-index__num {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-index__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 分组 ---------- */
.page-faq .faq-flow > section + section {
  margin-top: 48px;
}

.page-faq #cat-entry { --faq-c: var(--cyan); }
.page-faq #cat-version { --faq-c: var(--amber); }
.page-faq #cat-device { --faq-c: var(--wine); }
.page-faq #cat-file { --faq-c: var(--muted); }
.page-faq #flowchart { --faq-c: var(--cyan); }
.page-faq #next-step { --faq-c: var(--amber); }

.page-faq #cat-entry,
.page-faq #cat-version,
.page-faq #cat-device,
.page-faq #cat-file,
.page-faq #flowchart,
.page-faq #next-step {
  scroll-margin-top: 88px;
}

.page-faq .faq-group__head {
  border-left: 2px solid var(--faq-c, var(--cyan));
  padding-left: 14px;
  margin-bottom: 18px;
}

.page-faq .faq-group__head .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--faq-c, var(--cyan));
  margin: 0;
  text-transform: uppercase;
}

.page-faq .faq-group__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.16;
  color: var(--ink);
  margin: 6px 0 8px;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-2);
  margin: 0;
  max-width: 46ch;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 3px solid var(--faq-c, var(--cyan));
  background: rgba(14, 43, 51, 0.5);
  margin-bottom: 10px;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.page-faq .qa:hover {
  background: rgba(14, 43, 51, 0.85);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--faq-c, var(--cyan));
}

.page-faq .qa[open] .qa__q::after {
  content: "\2013";
}

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

.page-faq .qa__mark {
  flex: none;
  padding-top: 3px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--faq-c, var(--cyan));
}

.page-faq .qa__a {
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 40ch;
}

.page-faq .qa__a p + p {
  margin-top: 8px;
}

.page-faq .qa__path {
  margin-top: 12px;
}

.page-faq .path-chip {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 4px 10px;
  font-size: 12px;
  color: var(--cyan);
  background: rgba(47, 243, 208, 0.06);
  cursor: pointer;
}

.page-faq .path-chip[data-copied] {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 流程图 ---------- */
.page-faq .flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  position: relative;
}

.page-faq .flow::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--amber) 62%, var(--wine));
  opacity: 0.55;
}

.page-faq .flow__node {
  position: relative;
  padding: 0 0 24px 38px;
}

.page-faq .flow__node:last-child {
  padding-bottom: 0;
}

.page-faq .flow__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 19px;
  height: 19px;
  display: grid;
  place-items: center;
  background: var(--bg);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 10px;
  line-height: 1;
}

.page-faq .flow__title {
  margin: 1px 0 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

.page-faq .flow__tip {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.18s ease, max-height 0.18s ease;
}

.page-faq .flow__node:hover .flow__tip,
.page-faq .flow__node:focus-within .flow__tip {
  opacity: 1;
  max-height: 6em;
}

.page-faq .faq-flowchart__media {
  margin: 30px 0 0;
}

/* ---------- 下一步 ---------- */
.page-faq .faq-next {
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber);
  background: var(--zone);
  padding: 22px 18px;
}

.page-faq .faq-next .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0;
}

.page-faq .faq-next__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.16;
  color: var(--ink);
  margin: 8px 0 18px;
  letter-spacing: -0.01em;
}

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

.page-faq .faq-next__list li {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-faq .faq-next__num {
  font-size: 11px;
  line-height: 1.9;
  color: var(--amber);
}

.page-faq .faq-next__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 相关栏目 ---------- */
.page-faq .faq-related {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.page-faq .faq-related__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-related a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

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

/* ---------- 显现 ---------- */
.page-faq [data-reveal].is-visible {
  animation: faq-reveal 0.42s ease both;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 触屏与窄屏 ---------- */
@media (hover: none) {
  .page-faq .flow__tip {
    opacity: 1;
    max-height: 6em;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }

  .page-faq .faq-hero__panel {
    margin-top: 8px;
  }

  .page-faq .faq-next {
    padding: 26px 26px 24px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-faq .qa__a {
    padding-left: 52px;
  }

  .page-faq .qa__a p {
    max-width: 52ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal].is-visible {
    animation: none;
  }

  .page-faq .qa,
  .page-faq .flow__tip,
  .page-faq .faq-index__link {
    transition: none;
  }
}