.page-faq {
  --faq-rail-w: 210px;
  --faq-sticky-top: 14px;
  background:
    radial-gradient(1100px 560px at 88% -6%, rgba(108, 75, 232, 0.26), transparent 66%),
    radial-gradient(820px 460px at 2% 6%, rgba(46, 242, 224, 0.10), transparent 62%),
    var(--ink-900);
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(40px, 8vw, 92px) 0 clamp(22px, 4vw, 36px);
  overflow: hidden;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 8%;
  width: 56%;
  height: 74%;
  background: linear-gradient(140deg, rgba(46, 242, 224, 0.16), rgba(108, 75, 232, 0.30) 52%, transparent 78%);
  transform: skewX(-14deg);
  border-radius: var(--radius-l);
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-weight: 200;
  letter-spacing: 0.02em;
  line-height: 1.12;
}
.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--gray);
  font-size: 16px;
  line-height: 1.8;
}
.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}
.page-faq .faq-hero__quick .chip {
  text-decoration: none;
}

/* ---------- 侧栏章节导航 ---------- */
.page-faq .faq-rail {
  position: sticky;
  top: var(--faq-sticky-top);
  z-index: 6;
  margin-bottom: 10px;
  padding: 8px 0 10px;
  background: linear-gradient(180deg, var(--ink-900) 74%, rgba(5, 11, 31, 0));
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-rail__label {
  display: none;
}
.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(10, 23, 51, 0.76);
  color: var(--gray);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}
.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet-soft);
}
.page-faq .faq-rail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--violet);
  flex: none;
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  min-width: 0;
}
.page-faq .section {
  padding: clamp(32px, 5vw, 52px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}
.page-faq .section:first-child {
  border-top: 0;
  padding-top: clamp(20px, 3vw, 32px);
}
.page-faq .section-head {
  display: block;
  margin: 0 0 20px;
}
.page-faq .section-head__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.page-faq .section-head__title {
  margin: 0 0 8px;
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--white);
}
.page-faq .section-head__note {
  margin: 0;
  max-width: 58ch;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .prose {
  margin: 0 0 14px;
  max-width: 64ch;
  color: var(--gray);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 步骤清单 ---------- */
.page-faq .step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-faq .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 18px 16px;
  background: linear-gradient(180deg, rgba(10, 23, 51, 0.92), rgba(10, 23, 51, 0.56));
  border: 1px solid var(--line);
  border-radius: var(--radius-m) var(--radius-m) var(--radius-m) 6px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  scroll-margin-top: 100px;
}
.page-faq .step:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}
.page-faq .step__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.page-faq .step__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
}
.page-faq .step__text {
  margin: 0;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.78;
}

.page-faq .step-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}
.page-faq .step-jump a {
  display: inline-block;
  padding: 5px 11px;
  border: 1px dashed var(--line);
  border-radius: 999px;
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .step-jump a:hover,
.page-faq .step-jump a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  border-style: solid;
}

/* ---------- 提示条 ---------- */
.page-faq .callout {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 20px;
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(120deg, rgba(46, 242, 224, 0.10), rgba(108, 75, 232, 0.18));
}
.page-faq .callout__text {
  margin: 0;
  color: var(--white);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 周期示意 ---------- */
.page-faq .cycle-figure {
  margin: 20px 0 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: radial-gradient(620px 220px at 18% 0%, rgba(108, 75, 232, 0.26), transparent 72%), var(--ink-800);
}
.page-faq .cycle-scroll {
  overflow-x: auto;
}
.page-faq .cycle-svg {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}
.page-faq .cycle-axis {
  stroke: var(--line);
  stroke-width: 2;
  stroke-linecap: round;
}
.page-faq .cycle-line {
  stroke-width: 4;
  stroke-linecap: round;
  fill: none;
}
.page-faq .cycle-line--run {
  stroke: var(--cyan);
}
.page-faq .cycle-line--ext {
  stroke: var(--orange);
  stroke-dasharray: 10 8;
}
.page-faq .cycle-tick {
  stroke: var(--line);
  stroke-width: 2;
}
.page-faq .cycle-node {
  fill: var(--ink-900);
  stroke: var(--cyan);
  stroke-width: 2.5;
}
.page-faq .cycle-node--switch {
  stroke: var(--violet-soft);
}
.page-faq .cycle-node--end {
  stroke: var(--orange);
}
.page-faq .cycle-brace {
  fill: none;
  stroke: var(--orange);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}
.page-faq .cycle-svg text {
  font-family: var(--font-sans);
}
.page-faq .cycle-label {
  fill: var(--white);
  font-size: 17px;
  font-weight: 600;
}
.page-faq .cycle-sub {
  fill: var(--gray);
  font-size: 15px;
}
.page-faq .cycle-note {
  fill: var(--orange);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-faq .faq-media {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-faq .faq-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-figure {
  margin: 0;
}
.page-faq .faq-figure__cap {
  margin-top: 10px;
  color: var(--gray-dim);
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 场景卡 ---------- */
.page-faq .case-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin-top: 22px;
}
.page-faq .case {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 22px 22px 22px 6px;
  background: rgba(10, 23, 51, 0.68);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-faq .case:hover {
  border-color: var(--violet-soft);
  transform: translateY(-2px);
}
.page-faq .case__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}
.page-faq .case__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}
.page-faq .case__text {
  margin: 0;
  color: var(--gray);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 权益卡片 ---------- */
.page-faq .benefit-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}
.page-faq .benefit {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(10, 23, 51, 0.9), rgba(10, 23, 51, 0.5));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-faq .benefit:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}
.page-faq .benefit__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}
.page-faq .benefit__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
}
.page-faq .benefit__text {
  margin: 0;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .benefit__link {
  display: inline-block;
  margin-top: 14px;
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 224, 0.4);
}
.page-faq .benefit__link:hover,
.page-faq .benefit__link:focus-visible {
  color: var(--ice);
  border-bottom-color: var(--ice);
}
.page-faq .benefit--wide {
  background: linear-gradient(140deg, rgba(46, 242, 224, 0.09), rgba(108, 75, 232, 0.20) 60%, rgba(10, 23, 51, 0.6));
  border-radius: 6px var(--radius-l) var(--radius-l) var(--radius-l);
}

/* ---------- 查询区 ---------- */
.page-faq .query-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}
.page-faq .query-grid__media {
  order: -1;
}

/* ---------- 问答折叠 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 12px;
}
.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
  border-radius: 6px var(--radius-m) var(--radius-m) var(--radius-m);
  background: rgba(10, 23, 51, 0.72);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background: rgba(10, 23, 51, 0.96);
}
.page-faq .qa__q {
  position: relative;
  padding: 16px 48px 16px 18px;
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}
.page-faq .qa__q::-webkit-details-marker {
  display: none;
}
.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}
.page-faq .qa[open] .qa__q::after {
  content: "–";
}
.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 2px;
}
.page-faq .qa__a {
  padding: 0 18px 18px;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .qa__a ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

/* ---------- 收束 ---------- */
.page-faq .cta-band {
  margin: clamp(28px, 5vw, 48px) 0 clamp(28px, 5vw, 56px);
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(125deg, rgba(46, 242, 224, 0.12), rgba(108, 75, 232, 0.24) 55%, rgba(5, 11, 31, 0.4)), var(--ink-800);
}
.page-faq .cta-band__inner {
  display: grid;
  gap: 20px;
}
.page-faq .cta-band__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  color: var(--white);
}
.page-faq .cta-band__text {
  margin: 0;
  max-width: 58ch;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-faq .cta-band__actions .btn {
  text-decoration: none;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-faq .case-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .benefit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .benefit--wide {
    grid-column: span 2;
  }
  .page-faq .cta-band__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-faq .faq-shell {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 32px;
    margin: 0;
    padding: 0;
    background: none;
    border-bottom: 0;
    overflow: visible;
  }
  .page-faq .faq-rail__label {
    display: block;
    margin: 0 0 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--gray-dim);
  }
  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    position: relative;
    padding: 0;
  }
  .page-faq .faq-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: repeating-linear-gradient(180deg, var(--line) 0 4px, transparent 4px 8px);
  }
  .page-faq .faq-rail__item {
    position: relative;
  }
  .page-faq .faq-rail__link {
    position: relative;
    display: block;
    padding: 9px 0 9px 28px;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 14px;
    line-height: 1.5;
  }
  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--cyan);
  }
  .page-faq .faq-rail__num {
    display: block;
    margin-bottom: 2px;
  }
  .page-faq .faq-rail__dot {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 11px;
    height: 11px;
    border: 1px solid var(--line);
    background: var(--ink-900);
  }
  .page-faq .faq-rail__link:hover .faq-rail__dot,
  .page-faq .faq-rail__link:focus-visible .faq-rail__dot {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
  }
  .page-faq .cycle-svg {
    min-width: 0;
  }
  .page-faq .query-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 28px;
    align-items: start;
  }
  .page-faq .query-grid__media {
    order: 0;
    position: sticky;
    top: 32px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__title {
    max-width: 22ch;
  }
}