/* ================= 使用指南 /guide/ ================= */

.page-faq {
  --faq-line: var(--edge);
  --faq-surface: var(--chapter);
  --faq-accent: var(--cyan);
  display: block;
  color: var(--text);
  background: linear-gradient(180deg, var(--deep) 0%, #0A0F22 100%);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--header-h) + 2.75rem) var(--gutter) 2.5rem;
  background:
    radial-gradient(140% 110% at 88% -15%, rgba(95, 227, 222, 0.18), transparent 58%),
    radial-gradient(90% 80% at 6% 110%, rgba(255, 196, 107, 0.10), transparent 62%),
    linear-gradient(172deg, var(--deep) 0%, var(--chapter) 86%);
  border-bottom: 1px solid var(--faq-line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 154, 192, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 154, 192, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber) 52%, transparent 88%);
  opacity: 0.75;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 66rem;
}

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: 1.15rem;
  font-size: 0.8rem;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1rem;
  color: var(--text);
}

.page-faq .faq-hero .eyebrow {
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero .lede {
  max-width: 62ch;
  margin: 0 0 1.6rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-soft);
}

/* ---------- 横向直达入口带 ---------- */

.page-faq .faq-rail {
  background: rgba(20, 28, 63, 0.78);
  border-bottom: 1px solid var(--faq-line);
  backdrop-filter: blur(8px);
}

.page-faq .faq-rail__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  font-size: 0.88rem;
}

.page-faq .faq-rail__label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-rail a {
  color: var(--text-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-rail a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
  padding-top: 2.5rem;
  padding-bottom: 4.5rem;
}

.page-faq .faq-layout > * {
  min-width: 0;
}

.page-faq .toc {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(8px);
  padding: 1rem 1rem 1.1rem;
}

.page-faq .toc__title {
  margin: 0 0 0.7rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.page-faq .toc__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.42rem 0.6rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .toc__link .mono {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .toc__link:hover {
  color: var(--text);
  background: rgba(95, 227, 222, 0.07);
}

.page-faq .toc__link[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(95, 227, 222, 0.09);
}

.page-faq .toc__link[aria-current] .mono {
  color: var(--cyan);
}

/* ---------- 章节 ---------- */

.page-faq .faq-block {
  --faq-accent: var(--cyan);
  scroll-margin-top: calc(var(--header-h) + 1rem);
  padding-bottom: 0.5rem;
}

.page-faq .faq-block--amber {
  --faq-accent: var(--amber);
}

.page-faq .faq-block + .faq-block {
  padding-top: 3.25rem;
}

.page-faq .faq-block + .faq-block::before {
  content: "";
  display: block;
  width: 46px;
  height: 2px;
  border-radius: 2px;
  background: var(--faq-accent);
  opacity: 0.65;
  margin-bottom: 1.6rem;
}

.page-faq .faq-head {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1.1rem;
  padding-left: 0.95rem;
  border-left: 3px solid var(--faq-accent);
}

.page-faq .faq-head__num {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--faq-accent);
}

.page-faq .faq-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-block__intro {
  max-width: 64ch;
  margin: 0 0 1.5rem;
  font-size: 0.97rem;
  line-height: 1.9;
  color: var(--text-soft);
}

/* ---------- 主题卡片 ---------- */

.page-faq .topic-grid {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-faq .topic-card {
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
  height: 100%;
  padding: 1.05rem 1.1rem 1.2rem;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--faq-surface);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .topic-card::before {
  content: "";
  display: block;
  width: 26px;
  height: 3px;
  border-radius: 2px;
  background: var(--card-accent, var(--cyan));
  margin-bottom: 0.2rem;
}

.page-faq .topic-grid li:nth-child(1) .topic-card { --card-accent: var(--cyan); }
.page-faq .topic-grid li:nth-child(2) .topic-card { --card-accent: var(--amber); }
.page-faq .topic-grid li:nth-child(3) .topic-card { --card-accent: var(--mist); }
.page-faq .topic-grid li:nth-child(4) .topic-card { --card-accent: var(--cyan); }

.page-faq .topic-card:hover,
.page-faq .topic-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(95, 227, 222, 0.5);
  background: #172047;
}

.page-faq .topic-card__num {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .topic-card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.page-faq .topic-card__desc {
  flex: 1;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .topic-card__count {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--card-accent, var(--cyan));
}

/* ---------- 图片容器 ---------- */

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(158deg, #101733 0%, var(--chapter) 58%, #1B2450 100%);
}

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

.page-faq .faq-figure figcaption {
  padding: 0.75rem 1rem 0.85rem;
  border-top: 1px solid var(--faq-line);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 问答折叠 ---------- */

.page-faq .qa-list {
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa {
  border-bottom: 1px solid var(--faq-line);
  transition: background 0.25s var(--ease);
}

.page-faq .qa[open] {
  background: linear-gradient(180deg, rgba(95, 227, 222, 0.06), transparent 72%);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem 0.2rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  line-height: 1.62;
  color: var(--text);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--mist);
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  content: "\2212";
  color: var(--faq-accent);
  transform: rotate(180deg);
}

.page-faq .qa__q:hover .qa__text {
  color: var(--faq-accent);
}

.page-faq .qa__num {
  flex: 0 0 auto;
  min-width: 3rem;
  padding-top: 0.28rem;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--faq-accent);
}

.page-faq .qa__text {
  transition: color 0.2s var(--ease);
}

.page-faq .qa__a {
  padding: 0 0.2rem 1.3rem 0.2rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-faq .steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 0.2rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-faq .steps li {
  position: relative;
  counter-increment: faqstep;
  padding-left: 1.85rem;
}

.page-faq .steps li::before {
  content: counter(faqstep);
  position: absolute;
  left: 0;
  top: 0.32rem;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--faq-line);
  border-radius: 50%;
  background: rgba(95, 227, 222, 0.1);
  color: var(--faq-accent);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1;
}

.page-faq .qa__tip {
  margin: 0.9rem 0 0;
  padding: 0.6rem 0.85rem;
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255, 196, 107, 0.08);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 排查路径 ---------- */

.page-faq .path {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  counter-reset: faqpath;
}

.page-faq .path li {
  position: relative;
  counter-increment: faqpath;
  padding: 1rem 1.05rem 1.05rem 1.05rem;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-sm);
  background: rgba(20, 28, 63, 0.6);
}

.page-faq .path li::after {
  content: "";
  position: absolute;
  left: 1.05rem;
  top: 0;
  width: 30px;
  height: 2px;
  background: var(--faq-accent);
  border-radius: 2px;
  opacity: 0.8;
}

.page-faq .path__num {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--faq-accent);
  margin-bottom: 0.3rem;
}

.page-faq .path__title {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 0.28rem;
}

.page-faq .path__desc {
  display: block;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 清单与反馈 ---------- */

.page-faq .checklist {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
}

.page-faq .checklist__item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-sm);
  background: rgba(20, 28, 63, 0.5);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-soft);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .checklist__item::before {
  content: "";
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
  margin-top: 0.28rem;
  border: 1px solid var(--faq-line);
  border-radius: 4px;
  background: rgba(11, 16, 38, 0.65);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .checklist__item.is-done {
  color: var(--text);
  border-color: rgba(95, 227, 222, 0.45);
  background: rgba(95, 227, 222, 0.09);
}

.page-faq .checklist__item.is-done::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 2px var(--deep);
}

.page-faq .faq-cta {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  padding: 1.3rem 1.25rem 1.4rem;
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(255, 196, 107, 0.14), transparent 62%),
    var(--chapter);
}

.page-faq .faq-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.page-faq .faq-cta__desc {
  max-width: 60ch;
  margin: 0 0 1.1rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-faq .faq-contact {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0.95rem 0 0;
  border-top: 1px solid var(--faq-line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
}

.page-faq .faq-contact li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  min-width: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-faq .faq-contact .mono {
  flex: 0 0 auto;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-contact a {
  color: var(--cyan);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.page-faq .faq-contact a:hover {
  text-decoration: underline;
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 640px) {
  .page-faq .qa__a {
    padding-left: 3.85rem;
  }

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

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

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

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

@media (min-width: 900px) {
  .page-faq .topic-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 3.25rem;
    padding-top: 3rem;
  }

  .page-faq .faq-layout__aside {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    align-self: start;
  }

  .page-faq .faq-hero {
    padding-top: calc(var(--header-h) + 4rem);
    padding-bottom: 3.25rem;
  }
}

@media (min-width: 1100px) {
  .page-faq .path {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 弱动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .topic-card,
  .page-faq .toc__link,
  .page-faq .qa,
  .page-faq .qa__q::after,
  .page-faq .checklist__item {
    transition: none;
  }

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