.page-faq {
  --faq-light-ink: #0A0E12;
  --faq-light-soft: rgba(10, 14, 18, 0.74);
  --faq-light-line: rgba(10, 14, 18, 0.16);
  background: var(--c-deep);
  color: var(--ink);
  overflow-x: hidden;
}

.page-faq a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 36px) clamp(40px, 7vw, 84px);
  background:
    radial-gradient(110% 78% at 92% -12%, rgba(55, 242, 214, 0.18), transparent 62%),
    radial-gradient(80% 60% at 6% 0%, rgba(255, 107, 74, 0.1), transparent 60%),
    linear-gradient(180deg, var(--c-stand) 0%, var(--c-deep) 78%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(42, 74, 99, 0.42) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(42, 74, 99, 0.24) 0 1px, transparent 1px 88px);
  opacity: 0.7;
  pointer-events: none;
}

.page-faq .faq-hero .sb-container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(2.1rem, 7.4vw, 4.6rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-faq .faq-hero__index {
  border: 1px solid var(--line);
  background: rgba(11, 44, 71, 0.62);
  padding: 22px clamp(18px, 3vw, 26px);
  align-self: start;
}

.page-faq .faq-hero__index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-mint);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-index__list li {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  font-size: 14px;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--c-cyan);
  padding-left: 6px;
}

.page-faq .faq-index__list .sb-mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 0;
  background: var(--line-soft);
}

.page-faq .faq-hero__stats > div {
  background: rgba(6, 26, 43, 0.9);
  padding: 12px 10px;
}

.page-faq .faq-hero__stats dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}

.page-faq .faq-hero__stats dd {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--c-cyan);
}

/* ---------- 六步 ---------- */
.page-faq .faq-steps {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-steps__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: rgba(11, 44, 71, 0.5);
  padding: 18px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-mint);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 11px;
  border: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .faq-rail__list .sb-mono {
  font-size: 10px;
  color: var(--c-cyan);
}

.page-faq .faq-steps__head h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
}

.page-faq .faq-steps__head p {
  margin: 12px 0 0;
  max-width: 54ch;
  color: var(--ink-dim);
  line-height: 1.8;
  font-size: 15px;
}

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

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-step__num {
  margin: 0;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

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

.page-faq .faq-step__body h3 {
  margin: 0 0 9px;
  font-size: clamp(1.06rem, 2.4vw, 1.3rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.01em;
}

.page-faq .faq-step__body p {
  margin: 0 0 10px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-faq .faq-step--feature .faq-step__body {
  display: grid;
  gap: 18px;
}

.page-faq .faq-step__media {
  margin: 0;
}

/* ---------- 常见问题（浅色阅读区） ---------- */
.page-faq .faq-faq {
  background: var(--c-mist);
  color: var(--faq-light-ink);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-faq .sb-eyebrow {
  color: #0E6E60;
}

.page-faq .faq-faq__head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
  color: var(--faq-light-ink);
}

.page-faq .faq-faq__intro {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-light-soft);
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-faq .faq-chips a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(10, 14, 18, 0.24);
  font-size: 13px;
  text-decoration: none;
  color: var(--faq-light-ink);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-chips a:hover,
.page-faq .faq-chips a:focus-visible {
  background: var(--c-graphite);
  border-color: var(--c-graphite);
  color: var(--c-mist);
}

.page-faq .faq-chips__idx {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--c-coral);
}

.page-faq .faq-chips a:hover .faq-chips__idx,
.page-faq .faq-chips a:focus-visible .faq-chips__idx {
  color: var(--c-cyan);
}

.page-faq .faq-groups {
  display: grid;
  gap: 26px;
  margin-top: 34px;
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--c-graphite);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-faq .faq-group__title .sb-mono {
  font-size: 11px;
  color: var(--c-coral);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-light-line);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--faq-light-ink);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.3;
  color: #0E6E60;
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid #0E6E60;
  outline-offset: 2px;
}

.page-faq .faq-item__answer {
  padding: 0 0 16px;
}

.page-faq .faq-item__answer p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--faq-light-soft);
}

/* ---------- 平板与手机 ---------- */
.page-faq .faq-devices__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-faq .faq-devices__copy h2 {
  margin: 10px 0 20px;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
}

.page-faq .faq-devices__list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-devices__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-devices__list .sb-mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  padding-top: 4px;
}

.page-faq .faq-devices__list h3 {
  margin: 0 0 7px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-faq .faq-devices__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-faq .faq-devices__figure {
  margin: 0;
  width: 100%;
}

/* ---------- 图文与短视频 ---------- */
.page-faq .faq-guides {
  background:
    linear-gradient(180deg, rgba(11, 44, 71, 0.72) 0%, rgba(6, 26, 43, 0.96) 100%);
  border-block: 1px solid var(--line);
}

.page-faq .faq-guides__head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
}

.page-faq .faq-guides__head p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-faq .faq-guides__grid {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-faq .faq-guide-col {
  border: 1px solid var(--line);
  background: rgba(18, 63, 94, 0.34);
  padding: 18px;
}

.page-faq .faq-guide-col h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  letter-spacing: 0.05em;
}

.page-faq .faq-guide-col h3 .sb-mono {
  font-size: 10px;
  color: var(--c-cyan);
}

.page-faq .faq-guide-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-guide-col li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 9px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-faq .faq-guide-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--c-mint);
}

.page-faq .faq-videos {
  margin-top: 30px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-coral);
  padding: 20px;
  background: rgba(6, 26, 43, 0.7);
}

.page-faq .faq-videos__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mint);
}

.page-faq .faq-videos__list {
  display: grid;
  gap: 8px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-video;
}

.page-faq .faq-videos__list li {
  counter-increment: faq-video;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-faq .faq-videos__list li::before {
  content: counter(faq-video, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-cyan);
}

/* ---------- 联系客服 ---------- */
.page-faq .faq-support {
  background: linear-gradient(160deg, var(--c-stand) 0%, var(--c-deep) 72%);
}

.page-faq .faq-support__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-faq .faq-support__intro h2 {
  margin: 10px 0 16px;
  font-size: clamp(1.6rem, 4.2vw, 2.4rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
}

.page-faq .faq-support__intro p {
  margin: 0 0 14px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-faq .faq-support__note {
  color: var(--ink-dim) !important;
  font-size: 14px !important;
}

.page-faq .faq-support__intro .sb-btn {
  margin-top: 8px;
}

.page-faq .faq-support__card {
  border: 1px solid var(--line);
  background: rgba(6, 26, 43, 0.78);
  padding: 6px clamp(16px, 3vw, 24px) 18px;
}

.page-faq .faq-support__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-support__key {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-mint);
}

.page-faq .faq-support__val {
  margin: 4px 0 0;
  font-size: 15px;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-support__row .sb-copy {
  margin-top: 4px;
  flex: 0 0 auto;
}

.page-faq .faq-support__fine {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-faq .faq-support__fine a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-videos__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .faq-step--feature .faq-step__body {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }

  .page-faq .faq-steps__grid {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-rail__list {
    display: block;
  }

  .page-faq .faq-rail__list li {
    border-bottom: 1px solid var(--line-soft);
  }

  .page-faq .faq-rail__list a {
    display: flex;
    border: 0;
    padding: 10px 0;
    width: 100%;
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    padding-left: 6px;
  }

  .page-faq .faq-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 44px;
  }

  .page-faq .faq-devices__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

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

  .page-faq .faq-support__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero h1 {
    font-size: clamp(3rem, 5.4vw, 4.6rem);
  }

  .page-faq .faq-step--feature .faq-step__body {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}