.page-faq {
  --faq-line: rgba(143, 169, 189, 0.22);
  --faq-line-strong: rgba(143, 169, 189, 0.4);
  --faq-panel: linear-gradient(180deg, rgba(13, 42, 64, 0.86), rgba(7, 26, 43, 0.58));
  --faq-cyan-soft: rgba(31, 242, 209, 0.1);
  color: var(--fg);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

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

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.8rem, 4.5vw, 3.6rem) 0 clamp(2.2rem, 5vw, 3.4rem);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -25% -12% auto auto;
  width: min(720px, 95%);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 62% 38%, rgba(31, 242, 209, 0.16), rgba(31, 242, 209, 0) 62%),
    radial-gradient(circle at 28% 72%, rgba(255, 138, 61, 0.13), rgba(255, 138, 61, 0) 60%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: start;
}

.page-faq .faq-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.2vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-faq .faq-hero .lede {
  margin: 1.1rem 0 0;
  max-width: 36em;
  color: var(--soft);
  line-height: 1.85;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.page-faq .faq-hero__panel {
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
  border-radius: var(--r-lg);
  padding: clamp(1.1rem, 2.6vw, 1.7rem);
}

.page-faq .faq-hero__graph {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 1.1rem;
}

.page-faq .faq-hero__graph path {
  fill: none;
  stroke: var(--cyan-500);
  stroke-width: 1.4;
  opacity: 0.55;
}

.page-faq .faq-hero__graph path:nth-child(2) {
  stroke: var(--orange-500);
  opacity: 0.5;
}

.page-faq .faq-hero__graph path:nth-child(3) {
  stroke: var(--gold-400);
  stroke-dasharray: 3 6;
  opacity: 0.42;
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-faq .faq-stats li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: baseline;
  padding-top: 0.85rem;
  border-top: 1px solid var(--faq-line);
}

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

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  line-height: 1;
  color: var(--orange-500);
}

.page-faq .faq-stats__label {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--muted);
}

/* 主体骨架 */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.6rem);
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

.page-faq .faq-index {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-lg);
  background: rgba(13, 42, 64, 0.45);
  padding: 1.1rem;
}

.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.9rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--faq-line-strong);
  background: rgba(7, 26, 43, 0.7);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-search svg {
  flex: none;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--cyan-500);
  stroke-width: 1.6;
  stroke-linecap: round;
}

.page-faq .faq-search:hover,
.page-faq .faq-search:focus-visible {
  border-color: var(--cyan-500);
  color: var(--fg);
  background: rgba(31, 242, 209, 0.08);
}

.page-faq .faq-index__cap {
  margin: 1.1rem 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan-500);
}

.page-faq .faq-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-faq .faq-cat {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--faq-line);
  color: var(--soft);
  font-size: 0.88rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-cat::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--slate-400);
  opacity: 0.5;
  transition: background 0.2s ease, opacity 0.2s ease;
}

.page-faq .faq-cat__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  border-color: var(--cyan-500);
  background: var(--faq-cyan-soft);
  color: var(--fg);
}

.page-faq .faq-cat:hover::before,
.page-faq .faq-cat:focus-visible::before {
  background: var(--orange-500);
  opacity: 1;
}

.page-faq .faq-index__tip {
  margin: 1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--faq-line);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-index__tip a {
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 209, 0.4);
}

/* 章节 */
.page-faq .faq-section {
  scroll-margin-top: calc(var(--bar-h) + 1.5rem);
  padding-bottom: clamp(1.8rem, 4vw, 2.8rem);
}

.page-faq .faq-section + .faq-section {
  border-top: 1px solid var(--faq-line);
  padding-top: clamp(1.8rem, 4vw, 2.8rem);
}

.page-faq .faq-section__head {
  margin-bottom: 1.3rem;
}

.page-faq .chapter-mark {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--cyan-500);
}

.page-faq .faq-section.is-current .chapter-mark {
  color: var(--orange-500);
}

.page-faq .faq-section__head h2 {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-faq .faq-section__lede {
  margin: 0.7rem 0 0;
  max-width: 42em;
  color: var(--soft);
  font-size: 0.97rem;
  line-height: 1.85;
}

.page-faq .faq-section__lede a,
.page-faq .faq-item__a a {
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 209, 0.4);
}

.page-faq .faq-section__lede a:hover,
.page-faq .faq-item__a a:hover {
  border-bottom-color: var(--cyan-500);
}

/* 热门问题 */
.page-faq .faq-hot {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-hot a {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
  border-radius: var(--r-md);
  border: 1px solid var(--faq-line);
  background: rgba(13, 42, 64, 0.4);
  color: var(--fg);
  font-size: 0.94rem;
  line-height: 1.65;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-hot a span {
  flex: none;
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--orange-500);
}

.page-faq .faq-hot a:hover,
.page-faq .faq-hot a:focus-visible {
  border-color: var(--cyan-500);
  background: var(--faq-cyan-soft);
  transform: translateX(2px);
}

/* 图片 */
.page-faq .faq-figure {
  margin: clamp(1.4rem, 3vw, 2.1rem) 0 0;
}

.page-faq .media-frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--faq-line);
  overflow: hidden;
  background: var(--ink-800);
}

.page-faq .media-frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 手风琴 */
.page-faq .faq-list {
  display: grid;
  gap: 0.7rem;
}

.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(13, 42, 64, 0.62), rgba(7, 26, 43, 0.4));
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

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

.page-faq .faq-item[open] {
  border-color: rgba(31, 242, 209, 0.55);
  background: linear-gradient(180deg, rgba(13, 42, 64, 0.92), rgba(7, 26, 43, 0.6));
}

.page-faq .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: -2px;
}

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--cyan-500);
}

.page-faq .faq-item[open] summary::after {
  content: "–";
  color: var(--orange-500);
}

.page-faq .faq-item__num {
  flex: none;
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
}

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

.page-faq .faq-item__a {
  padding: 0 1.15rem 1.15rem 2.85rem;
  color: var(--soft);
  font-size: 0.94rem;
  line-height: 1.85;
}

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

.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0.7rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 1.9rem;
  counter-increment: faqstep;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1em;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--orange-500);
}

/* 联系 */
.page-faq .faq-contact {
  display: grid;
  gap: 0.8rem;
}

.page-faq .faq-contact__card {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  background: rgba(13, 42, 64, 0.45);
  padding: 1.05rem 1.15rem;
}

.page-faq .faq-contact__key {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold-400);
}

.page-faq .faq-contact__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--fg);
  word-break: break-word;
}

.page-faq .faq-contact__val a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 209, 0.45);
}

.page-faq .faq-contact__val a:hover {
  color: var(--cyan-500);
}

.page-faq .faq-contact__note {
  margin: 0.5rem 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-cta {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.35rem;
  border-radius: var(--r-lg);
  border: 1px solid var(--faq-line);
  background: linear-gradient(120deg, rgba(11, 79, 90, 0.62), rgba(13, 42, 64, 0.5));
}

.page-faq .faq-cta p {
  margin: 0;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--soft);
}

/* 响应式 */
@media (min-width: 720px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(1.8rem, 4vw, 3rem);
  }

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

  .page-faq .faq-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-item summary {
    padding: 1.1rem 1.4rem;
    font-size: 1.03rem;
  }

  .page-faq .faq-item__a {
    padding: 0 1.4rem 1.3rem 3.15rem;
    font-size: 0.97rem;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: 252px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 1.25rem);
    padding: 1.25rem 1.1rem;
  }

  .page-faq .faq-cats {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-faq .faq-cat {
    justify-content: flex-start;
    width: 100%;
  }

  .page-faq .faq-cat__num {
    margin-left: auto;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item__a {
    padding-left: 1.15rem;
  }

  .page-faq .faq-index__tip {
    font-size: 0.82rem;
  }

  .page-faq .faq-cta {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hot a,
  .page-faq .faq-cat,
  .page-faq .faq-search,
  .page-faq .faq-item {
    transition: none;
  }

  .page-faq .faq-hot a:hover {
    transform: none;
  }
}