.page-faq {
  --faq-line: rgba(232, 237, 242, .14);
  --faq-soft: rgba(232, 237, 242, .78);
  --faq-dim: rgba(232, 237, 242, .62);
  padding-bottom: clamp(64px, 9vw, 120px);
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-faq .breadcrumb__item {
  color: var(--faq-dim);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(232, 237, 242, .3);
}

.page-faq .breadcrumb__item a {
  color: var(--cyan);
  text-decoration: none;
}

.page-faq .breadcrumb__item a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
  margin: clamp(22px, 3vw, 40px) 0 clamp(36px, 5vw, 64px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--frost);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.1vw, 1.06rem);
  line-height: 1.85;
  color: var(--faq-soft);
}

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

.page-faq .faq-hero__panel {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid rgba(232, 237, 242, .2);
  border-radius: var(--r-lg);
  background:
    linear-gradient(158deg, rgba(45, 226, 230, .12), rgba(16, 42, 67, .74) 46%, rgba(11, 27, 43, .94));
  box-shadow: var(--shadow-lg);
}

.page-faq .faq-hero__panel-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-stat {
  display: grid;
  gap: 10px;
  margin: 0;
}

.page-faq .faq-stat__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--faq-line);
}

.page-faq .faq-stat__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-stat dt {
  font-size: .9rem;
  color: var(--faq-dim);
}

.page-faq .faq-stat dd {
  margin: 0;
  font-size: .95rem;
  font-weight: 600;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hero__panel-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--faq-line);
  font-size: .84rem;
  line-height: 1.7;
  color: var(--faq-dim);
}

/* ---------- 索引 + 答案区 ---------- */

.page-faq .faq-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-faq .faq-rail {
  padding: 18px;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-lg);
  background: rgba(16, 42, 67, .5);
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

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

.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: .92rem;
  line-height: 1.5;
  color: var(--faq-dim);
  text-decoration: none;
  transition: color .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease);
}

.page-faq .faq-rail__list a .mono {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate);
  transition: color .22s var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--frost);
  background: rgba(45, 226, 230, .09);
  border-left-color: var(--cyan);
}

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

/* ---------- 卡片 ---------- */

.page-faq .faq-stream {
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
  min-width: 0;
}

.page-faq .faq-card {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3vw, 38px);
  border: 1px solid var(--faq-line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(16, 42, 67, .8), rgba(11, 27, 43, .9));
}

.page-faq .faq-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(45, 226, 230, .1) 55%, var(--orange));
}

.page-faq .faq-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 14px;
}

.page-faq .faq-card__no {
  flex: none;
  padding: 4px 11px;
  border: 1px solid rgba(45, 226, 230, .42);
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.5vw, 1.85rem);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -.008em;
  color: var(--frost);
}

.page-faq .faq-card__intro {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--faq-soft);
}

/* ---------- 清单 ---------- */

.page-faq .checklist {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .checklist--tight {
  margin-top: 20px;
}

.page-faq .checklist li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.page-faq .checklist__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(247, 201, 72, .42);
  font-size: 11px;
  color: var(--amber);
}

.page-faq .checklist p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--faq-soft);
}

/* ---------- 步骤 ---------- */

.page-faq .steps {
  display: grid;
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .steps__item {
  position: relative;
  display: flex;
  gap: 16px;
  padding-bottom: 22px;
}

.page-faq .steps__item:last-child {
  padding-bottom: 0;
}

.page-faq .steps__item::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 36px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(45, 226, 230, .5), rgba(45, 226, 230, .05));
}

.page-faq .steps__item:last-child::after {
  display: none;
}

.page-faq .steps__no {
  flex: none;
  display: grid;
  place-items: center;
  width: 35px;
  height: 35px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(45, 226, 230, .35);
  background: rgba(45, 226, 230, .08);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .steps__body {
  padding-top: 3px;
}

.page-faq .steps__body strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--frost);
}

.page-faq .steps__body p {
  margin: 7px 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--faq-soft);
}

.page-faq .steps--compact .steps__body p {
  color: var(--faq-dim);
}

/* ---------- 问答折叠 ---------- */

.page-faq .qa {
  margin-top: 18px;
  padding-top: 4px;
  border-top: 1px dashed var(--faq-line);
}

.page-faq .qa > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  list-style: none;
  cursor: pointer;
  font-size: .98rem;
  font-weight: 600;
  color: var(--frost);
}

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

.page-faq .qa > summary::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(45, 226, 230, .16);
}

.page-faq .qa > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--orange);
}

.page-faq .qa[open] > summary::after {
  content: "–";
}

.page-faq .qa__body p {
  margin: 0 0 14px;
  padding-left: 17px;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--faq-soft);
}

.page-faq .qa__body p:last-child {
  margin-bottom: 4px;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--faq-dim);
}

/* ---------- 同步刻度 ---------- */

.page-faq .sync-scale {
  margin: 26px 0 0;
  padding: 20px clamp(14px, 2.4vw, 26px) 16px;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  background: rgba(11, 27, 43, .6);
}

.page-faq .sync-scale__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .sync-scale figcaption {
  margin-top: 8px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--faq-dim);
}

@keyframes faqPulse {
  0%, 100% { opacity: .5; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: no-preference) {
  .page-faq .sync-scale__hint {
    animation: faqPulse 6s ease-in-out infinite;
  }
}

/* ---------- 支持区 ---------- */

.page-faq .support-list {
  display: grid;
  gap: 1px;
  margin-top: 22px;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--faq-line);
}

.page-faq .support-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 14px 16px;
  background: rgba(11, 27, 43, .82);
}

.page-faq .support-item__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-faq .support-item__v {
  font-size: .95rem;
  color: var(--frost);
  word-break: break-word;
}

.page-faq .faq-card__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--faq-line);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .85fr);
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-faq .faq-stage {
    grid-template-columns: minmax(184px, 236px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    max-height: calc(100vh - 56px);
    overflow: auto;
  }

  .page-faq .faq-rail__list {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__list a,
  .page-faq .qa > summary::after {
    transition: none;
  }
}