.page-faq {
  --faq-index-w: 300px;
  --faq-sticky-top: 104px;
  display: block;
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 3.4vw, 44px) 0 clamp(30px, 4.2vw, 58px);
}

.page-faq .faq-hero::before,
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-hero::before {
  width: 46vw;
  height: 46vw;
  min-width: 300px;
  min-height: 300px;
  right: -10vw;
  top: -14vw;
  background: radial-gradient(circle, rgba(124, 60, 255, 0.34), rgba(124, 60, 255, 0) 68%);
}

.page-faq .faq-hero::after {
  width: 34vw;
  height: 34vw;
  min-width: 220px;
  min-height: 220px;
  left: -12vw;
  bottom: -20vw;
  background: radial-gradient(circle, rgba(35, 211, 238, 0.22), rgba(35, 211, 238, 0) 70%);
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-faq .faq-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq .faq-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--grad-brand);
  transform: skewX(-28deg);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-faq .faq-hero .lead {
  margin: 0 0 22px;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--c-muted);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-faq .faq-stats li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--c-line);
  background: rgba(20, 24, 38, 0.74);
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-muted);
}

.page-faq .faq-stats .num {
  font-family: var(--f-mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: var(--c-lime);
}

.page-faq .faq-hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--c-line);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(205deg, rgba(35, 211, 238, 0.16), rgba(10, 12, 20, 0) 46%, rgba(10, 12, 20, 0.6));
  pointer-events: none;
}

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

/* ---------- 三步流程 ---------- */
.page-faq .faq-steps {
  padding: clamp(32px, 5vw, 68px) 0;
  border-top: 1px solid var(--c-line-soft);
}

.page-faq .faq-section-head {
  display: grid;
  gap: 10px;
  max-width: 46em;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-faq .faq-section-head h2 {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-faq .faq-section-head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-faq .step-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .step-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-soft);
}

.page-faq .step-card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: var(--grad-brand);
  transform: scaleX(0.3);
  transform-origin: left center;
  transition: transform 340ms ease;
}

.page-faq .step-card:hover::before,
.page-faq .step-card:focus-within::before {
  transform: scaleX(1);
}

.page-faq .step-no {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-purple);
  border: 1px solid rgba(124, 60, 255, 0.5);
}

.page-faq .step-card h3 {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-faq .step-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-faq .step-card .step-trap {
  margin-top: 12px;
  padding-left: 11px;
  border-left: 2px solid var(--c-amber);
  font-size: 13px;
  line-height: 1.65;
  color: rgba(255, 178, 36, 0.9);
}

.page-faq .step-visual {
  position: relative;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border: 1px solid var(--c-line);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 0 100%);
}

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

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  padding: clamp(30px, 4.4vw, 64px) 0 clamp(40px, 5vw, 80px);
  border-top: 1px solid var(--c-line-soft);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 3.2vw, 42px);
}

.page-faq .faq-index {
  position: relative;
  padding: clamp(16px, 2vw, 22px) clamp(14px, 1.8vw, 20px);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-index::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: var(--grad-brand);
}

.page-faq .faq-index-title {
  margin: 6px 0 14px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index-list a {
  display: flex;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-muted);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.page-faq .faq-index-list a:hover,
.page-faq .faq-index-list a:focus-visible {
  color: var(--c-text);
  background: rgba(35, 211, 238, 0.08);
  border-left-color: var(--c-cyan);
}

.page-faq .faq-index-list .qq {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(28px, 3.6vw, 44px);
}

.page-faq .faq-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
  font-family: var(--f-display);
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-faq .faq-group-key {
  padding: 2px 7px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-lime);
  border: 1px solid rgba(166, 255, 60, 0.42);
}

.page-faq .qa {
  scroll-margin-top: 112px;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  transition: border-color 200ms ease, background-color 200ms ease;
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--c-text);
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa-no {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--c-muted);
  transition: color 200ms ease;
}

.page-faq .qa-q {
  flex: 1 1 auto;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.72;
}

.page-faq .qa-mark {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-size: 17px;
  line-height: 1.55;
  color: var(--c-cyan);
  transition: transform 220ms ease, color 220ms ease;
}

.page-faq .qa:hover {
  border-color: rgba(152, 162, 190, 0.32);
}

.page-faq .qa[open] {
  border-color: rgba(35, 211, 238, 0.4);
  background: #171c2c;
}

.page-faq .qa[open] .qa-no {
  color: var(--c-cyan);
}

.page-faq .qa[open] .qa-mark {
  transform: rotate(45deg);
  color: var(--c-lime);
}

.page-faq .qa:target {
  border-color: rgba(166, 255, 60, 0.5);
  box-shadow: 0 0 0 1px rgba(166, 255, 60, 0.18);
}

.page-faq .qa-body {
  padding: 13px 16px 17px 48px;
  border-top: 1px solid var(--c-line-soft);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-faq .qa-body p {
  margin: 0;
}

.page-faq .qa-body p + p {
  margin-top: 8px;
}

.page-faq .qa-body strong {
  color: var(--c-text);
  font-weight: 600;
}

/* ---------- 结尾引导 ---------- */
.page-faq .faq-still {
  padding: 0 0 clamp(46px, 6vw, 92px);
}

.page-faq .still-panel {
  position: relative;
  display: grid;
  gap: 22px;
  padding: clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--c-line);
  overflow: hidden;
  background:
    linear-gradient(118deg, rgba(124, 60, 255, 0.18), rgba(35, 211, 238, 0.09) 52%, rgba(20, 24, 38, 0) 78%),
    var(--c-panel);
  box-shadow: var(--shadow-soft);
}

.page-faq .still-panel::after {
  content: "";
  position: absolute;
  right: -46px;
  bottom: -52px;
  width: 190px;
  height: 190px;
  background: var(--grad-brand);
  opacity: 0.15;
  transform: rotate(24deg);
  pointer-events: none;
}

.page-faq .still-copy {
  position: relative;
  z-index: 1;
}

.page-faq .still-panel h2 {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-size: clamp(21px, 2.6vw, 30px);
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-faq .still-panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.76;
  color: var(--c-muted);
}

.page-faq .still-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 860px) {
  .page-faq .step-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-faq .step-card:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -22px;
    width: 18px;
    height: 2px;
    background: linear-gradient(90deg, var(--c-purple), var(--c-cyan));
    transform: translateY(-50%) skewX(-30deg);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

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

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
  }
}

@media (min-width: 760px) {
  .page-faq .still-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (max-width: 560px) {
  .page-faq .qa-body {
    padding-left: 16px;
  }

  .page-faq .qa-q {
    font-size: 15px;
  }

  .page-faq .faq-stats li {
    font-size: 12px;
    padding: 6px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step-card::before,
  .page-faq .qa-mark,
  .page-faq .qa,
  .page-faq .qa-no,
  .page-faq .faq-index-list a {
    transition: none;
  }
}
</style>