.page-faq {
  --faq-side-w: 208px;
  --faq-rule: 1px solid var(--c-grid);
  --faq-glow: 0 0 12px rgba(255, 122, 26, .45);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-grey);
}
.page-faq .crumbs a {
  color: var(--c-grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.page-faq .crumbs a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 52px;
  border-bottom: var(--faq-rule);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  left: -12%;
  width: 124%;
  height: 132%;
  background: linear-gradient(118deg, rgba(108, 75, 244, .40) 0%, rgba(108, 75, 244, .12) 44%, rgba(0, 229, 255, .06) 60%, transparent 74%);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 0 95%);
  pointer-events: none;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: .32;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}
.page-faq .faq-hero__copy .eyebrow {
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  margin: 0 0 14px;
}
.page-faq .faq-hero__copy h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 7vw, 54px);
  line-height: 1.16;
  letter-spacing: .02em;
  color: var(--c-star);
  max-width: 18ch;
  border-left: 4px solid var(--c-nebula);
  padding-left: 16px;
}
.page-faq .faq-hero__copy .lead {
  margin: 0 0 24px;
  max-width: 62ch;
  color: var(--c-grey);
  font-size: 16px;
  line-height: 1.8;
}
.page-faq .faq-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  border: var(--faq-rule);
  background: var(--c-grid);
  align-self: start;
}
.page-faq .faq-hero__fact {
  background: rgba(12, 19, 48, .86);
  padding: 14px 16px;
}
.page-faq .faq-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-grey);
  margin-bottom: 4px;
}
.page-faq .faq-hero__fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.page-faq .faq-hero__num {
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: 38px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-orange);
  text-shadow: var(--faq-glow);
}
.page-faq .faq-hero__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-star);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 36px;
  padding-bottom: 64px;
}
.page-faq .faq-side {
  min-width: 0;
}
.page-faq .faq-side__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-nebula);
}
.page-faq .faq-side .index-rail {
  position: static;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  border: 0;
  scrollbar-width: thin;
}
.page-faq .faq-side .index-rail__item {
  flex: 0 0 auto;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--c-grey);
  text-decoration: none;
  border: 1px solid var(--c-grid);
  border-left: 3px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.page-faq .faq-side .index-rail__item:hover {
  color: var(--c-star);
  border-color: var(--c-cyan);
}
.page-faq .faq-side .index-rail__item[aria-current]:not([aria-current="false"]) {
  color: var(--c-cyan);
  background: rgba(0, 229, 255, .08);
  border-left-color: var(--c-cyan);
}

/* ---------- 问答串 ---------- */
.page-faq .faq-stream {
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.page-faq .faq-group {
  border-top: var(--faq-rule);
  padding-bottom: 34px;
}
.page-faq .faq-group + .faq-group {
  margin-top: 34px;
}
.page-faq .faq-group__head {
  padding: 22px 0 8px;
}
.page-faq .faq-group__head .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: .14em;
  color: var(--c-nebula);
  margin-bottom: 8px;
}
.page-faq .faq-group__head h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 4.4vw, 27px);
  line-height: 1.34;
  letter-spacing: .04em;
  color: var(--c-star);
}
.page-faq .faq-group__intro {
  margin: 0;
  max-width: 66ch;
  color: var(--c-grey);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .faq-group__grid {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

/* 单条问答 */
.page-faq .qa {
  position: relative;
  border-bottom: var(--faq-rule);
}
.page-faq .qa summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 38px 16px 12px;
  cursor: pointer;
  list-style: none;
  border-left: 3px solid transparent;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.page-faq .qa summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa summary:hover {
  border-left-color: var(--c-nebula);
  background: rgba(108, 75, 244, .07);
}
.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}
.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 12px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-cyan);
}
.page-faq .qa[open] > summary {
  border-left-color: var(--c-cyan);
  background: rgba(0, 229, 255, .06);
}
.page-faq .qa[open] > summary::after {
  content: "−";
  color: var(--c-orange);
}
.page-faq .qa__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-orange);
  padding-top: 3px;
}
.page-faq .qa__q {
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-star);
}
.page-faq .qa__body {
  padding: 4px 18px 20px 30px;
  border-left: 3px solid var(--c-cyan);
  color: var(--c-grey);
  font-size: 15px;
  line-height: 1.8;
  animation: faq-open var(--t-base) var(--ease);
}
.page-faq .qa__body p {
  margin: 0 0 10px;
  max-width: 64ch;
}
.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}
.page-faq .qa__link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .5);
}
.page-faq .qa__link:hover {
  color: var(--c-star);
  border-bottom-color: var(--c-star);
}
@keyframes faq-open {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* 步骤 */
.page-faq .steps {
  list-style: none;
  counter-reset: step;
  margin: 12px 0 0;
  padding: 0 0 0 4px;
}
.page-faq .steps li {
  position: relative;
  counter-increment: step;
  margin-left: 12px;
  padding: 0 0 16px 34px;
  border-left: 1px solid var(--c-grid);
}
.page-faq .steps li:last-child {
  border-left-color: transparent;
  padding-bottom: 4px;
}
.page-faq .steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -18px;
  top: 0;
  width: 34px;
  box-sizing: border-box;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-cyan);
  background: var(--c-deep);
  padding: 1px 0;
  text-align: left;
  padding-left: 8px;
}

/* 对比两列 */
.page-faq .cmp {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-grid);
  border: var(--faq-rule);
}
.page-faq .cmp__col {
  background: rgba(12, 19, 48, .9);
  padding: 12px 14px;
}
.page-faq .cmp__col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
}
.page-faq .cmp__head {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-orange);
  margin-bottom: 6px !important;
}

/* 图片 */
.page-faq .faq-figure {
  margin: 20px 0 0;
  border: var(--faq-rule);
  background: var(--c-panel);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}
.page-faq .faq-figure--rank img {
  aspect-ratio: 5 / 3;
}
.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: var(--faq-rule);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--c-grey);
}

/* ---------- 结尾协助 ---------- */
.page-faq .faq-help {
  margin-top: 44px;
  padding: 26px 22px;
  border: 1px solid var(--c-nebula);
  border-left: 5px solid var(--c-orange);
  background: linear-gradient(100deg, rgba(108, 75, 244, .18), rgba(0, 229, 255, .05) 62%, transparent);
  display: grid;
  gap: 18px;
}
.page-faq .faq-help h2 {
  margin: 0 0 10px;
  font-size: 21px;
  letter-spacing: .04em;
  color: var(--c-star);
}
.page-faq .faq-help p {
  margin: 0;
  max-width: 58ch;
  color: var(--c-grey);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .faq-help__btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero {
    padding: 46px 0 64px;
  }
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }
  .page-faq .faq-hero__facts {
    grid-template-columns: 1fr;
  }
  .page-faq .cmp {
    grid-template-columns: 1fr 1fr;
  }
  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    gap: 52px;
    padding-top: 46px;
  }
  .page-faq .faq-side {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-faq .faq-side .index-rail {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
    border-left: var(--faq-rule);
  }
  .page-faq .faq-side .index-rail__item {
    border: 0;
    border-left: 3px solid transparent;
    padding: 9px 10px 9px 14px;
  }
  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
    align-items: start;
  }
  .page-faq .faq-group__grid .faq-figure {
    margin-top: 0;
  }
  .page-faq .faq-group__head {
    padding-top: 26px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 1fr) 360px;
  }
  .page-faq .faq-figure--rank {
    max-width: 76%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body {
    animation: none;
  }
  .page-faq .qa summary,
  .page-faq .faq-side .index-rail__item {
    transition: none;
  }
}