.page-faq {
  --faq-gap: clamp(16px, 2.4vw, 28px);
  position: relative;
  color: var(--ink-90);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 36px) 0 clamp(48px, 7vw, 88px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -30% -25% 18% -40%;
  background:
    radial-gradient(55% 55% at 18% 20%, rgba(59, 30, 110, 0.95), transparent 72%),
    radial-gradient(40% 40% at 88% 6%, rgba(57, 230, 242, 0.16), transparent 70%),
    radial-gradient(38% 38% at 62% 92%, rgba(122, 77, 255, 0.2), transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 8%;
  right: -14%;
  width: min(520px, 62vw);
  height: min(520px, 62vw);
  border: 1px solid rgba(57, 230, 242, 0.2);
  border-radius: 50%;
  transform: rotate(-14deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-faq .faq-hero__title {
  margin: 16px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(34px, 6.6vw, 64px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-faq .faq-hero__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(57, 230, 242, 0.16);
  animation: faq-pulse 2.6s ease-in-out infinite;
}

@keyframes faq-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

.page-faq .faq-hero__lead {
  max-width: 58ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--ink-70);
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: clamp(24px, 3.4vw, 34px);
  padding: 16px clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(120deg, rgba(27, 58, 140, 0.42), rgba(255, 255, 255, 0.03));
}

.page-faq .faq-quick__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: rgba(57, 230, 242, 0.12);
  color: var(--neon);
}

.page-faq .faq-quick__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-50);
}

.page-faq .faq-quick__list {
  flex: 1 1 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chip {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .faq-chip:hover,
.page-faq .faq-chip:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(4, 7, 22, 0.5);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-hover);
  aspect-ratio: 3 / 2;
}

.page-faq .faq-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-hero__scan {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(10, 15, 44, 0.04) 28%, rgba(10, 15, 44, 0.75) 100%);
  pointer-events: none;
}

/* ---------- 主体：轨道 + 面板 ---------- */
.page-faq .faq-board {
  padding-top: clamp(36px, 6vw, 68px);
}

.page-faq .faq-board__inner {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

.page-faq .faq-rail__toc {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-faq .faq-rail__card {
  margin-top: 16px;
  padding: 18px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(255, 184, 77, 0.1), rgba(255, 255, 255, 0.02));
}

.page-faq .faq-rail__card-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-faq .faq-rail__card-text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-faq .faq-rail__btn {
  text-decoration: none;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(36px, 5vw, 64px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: rgba(57, 230, 242, 0.5);
}

.page-faq .faq-group__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-group__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-faq .faq-group__lead a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 242, 0.4);
}

.page-faq .faq-group__lead a:hover,
.page-faq .faq-group__lead a:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-fold {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.028);
  transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.page-faq .faq-fold:hover {
  border-color: rgba(57, 230, 242, 0.35);
}

.page-faq .faq-fold[open] {
  border-color: rgba(57, 230, 242, 0.42);
  background: linear-gradient(140deg, rgba(27, 58, 140, 0.3), rgba(255, 255, 255, 0.03));
  box-shadow: 0 16px 40px rgba(4, 7, 22, 0.45);
}

.page-faq .faq-fold .fold__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 18px clamp(16px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(15.5px, 1.7vw, 17px);
  line-height: 1.6;
  color: var(--ink-90);
}

.page-faq .faq-fold .fold__summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-fold .fold__summary::marker {
  content: "";
}

.page-faq .faq-fold[open] .fold__summary {
  color: var(--white);
}

.page-faq .faq-fold__no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--ink-50);
}

.page-faq .faq-fold[open] .faq-fold__no {
  color: var(--neon);
}

.page-faq .faq-fold__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--neon);
  font-size: 16px;
  line-height: 1;
  transition: transform 0.25s ease, background 0.25s ease;
}

.page-faq .faq-fold[open] .faq-fold__mark {
  transform: rotate(45deg);
  background: rgba(57, 230, 242, 0.14);
}

.page-faq .faq-fold .faq-fold__body {
  padding: 0 clamp(16px, 2.4vw, 24px) 22px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-70);
}

.page-faq .faq-fold__body p {
  margin: 0 0 10px;
}

.page-faq .faq-fold__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-fold__body a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 184, 77, 0.4);
}

.page-faq .faq-fold__body a:hover,
.page-faq .faq-fold__body a:focus-visible {
  border-bottom-color: var(--gold);
}

/* ---------- 移动端示意图 ---------- */
.page-faq .faq-mobile-figure {
  margin: 24px 0 0;
  max-width: 320px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
}

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

.page-faq .faq-mobile-figure__caption {
  padding: 12px 16px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-50);
}

/* ---------- 收尾引导 ---------- */
.page-faq .faq-cta {
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-faq .faq-cta__inner {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 24px;
  padding: clamp(26px, 5vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(255, 184, 77, 0.16), transparent 62%),
    linear-gradient(130deg, rgba(59, 30, 110, 0.85), rgba(10, 15, 44, 0.92));
}

.page-faq .faq-cta__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-cta__lead {
  max-width: 62ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-70);
}

.page-faq .faq-cta__actions {
  align-items: center;
}

.page-faq .faq-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

  .page-faq .faq-hero__media {
    transform: translateY(26px);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-board__inner {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-mobile-figure {
    max-width: 360px;
  }
}

@media (max-width: 599px) {
  .page-faq .faq-fold .fold__summary {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 16px;
  }

  .page-faq .faq-fold__mark {
    grid-column: 2;
    justify-self: start;
    width: 22px;
    height: 22px;
    font-size: 14px;
  }

  .page-faq .faq-group__head {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .page-faq .faq-quick {
    padding: 14px;
  }
}