.page-faq {
  --faq-nav-w: 232px;
  --faq-rule: 1px solid var(--line);
  --faq-lift: 6px;
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 7vw, 96px);
  overflow: clip;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  left: 34%;
  width: 78%;
  height: 118%;
  background: radial-gradient(52% 52% at 50% 50%, rgba(110, 75, 255, .20), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  align-items: end;
}

.page-faq .faq-hero__text {
  min-width: 0;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-size: clamp(38px, 7.4vw, 96px);
  line-height: 1.02;
  letter-spacing: -.025em;
  font-weight: 220;
  color: var(--hi);
  text-shadow: 0 0 42px rgba(110, 75, 255, .28);
}

.page-faq .faq-hero__lede {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 56ch;
  color: var(--body);
}

/* 框景视觉 */
.page-faq .faq-visual {
  position: relative;
  padding: clamp(10px, 1.4vw, 16px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(11, 16, 32, .94), rgba(5, 7, 14, .62));
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-visual::before {
  content: "";
  position: absolute;
  inset: -10px;
  pointer-events: none;
  opacity: .5;
  background:
    linear-gradient(var(--cyan), var(--cyan)) left top / 18px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) left top / 1px 18px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) right top / 18px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) right top / 1px 18px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) left bottom / 18px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) left bottom / 1px 18px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) right bottom / 18px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) right bottom / 1px 18px no-repeat;
}

.page-faq .faq-visual img,
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 2px;
  background: linear-gradient(150deg, #0B1020, #05070E);
}

/* ---------- 主体两段式 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(36px, 5vw, 56px);
  padding-bottom: clamp(72px, 10vw, 140px);
  min-width: 0;
}

.page-faq .faq-groups {
  min-width: 0;
}

/* 左侧分类索引 */
.page-faq .faq-nav {
  min-width: 0;
}

.page-faq .faq-nav__label {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: var(--faq-rule);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--mute);
}

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

.page-faq .faq-nav__item {
  min-width: 0;
}

.page-faq .faq-nav__link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 14px;
  border: var(--faq-rule);
  border-radius: var(--radius);
  background: var(--ink-800);
  color: var(--body);
  text-decoration: none;
  font-size: 15px;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-faq .faq-nav__num {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mute);
  transition: color .2s ease, font-weight .2s ease;
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  border-color: var(--violet);
  background: var(--ink-700);
  color: var(--hi);
}

.page-faq .faq-nav__link:hover .faq-nav__num,
.page-faq .faq-nav__link:focus-visible .faq-nav__num {
  color: var(--violet);
  font-weight: 700;
}

.page-faq .faq-nav__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 104px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(56px, 8vw, 104px);
}

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

.page-faq .faq-group__num {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .02em;
  transition: color .26s ease;
}

.page-faq .faq-group:has(details[open]) .faq-group__num {
  color: var(--violet);
}

.page-faq .faq-group__title {
  margin: 0;
  color: var(--hi);
}

.page-faq .faq-group__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  border-bottom: var(--faq-rule);
}

.page-faq .faq-item {
  border-top: var(--faq-rule);
}

.page-faq .faq-item:first-child {
  border-top: 0;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 20px 4px;
  cursor: pointer;
  list-style: none;
  color: var(--hi);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.55;
  transition: color .2s ease;
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover {
  color: var(--violet);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__idx {
  flex: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-faq .faq-item__text {
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: none;
  margin-left: auto;
  width: 14px;
  height: 14px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .24s ease, background-color .24s ease;
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
}

.page-faq .faq-item[open] .faq-item__mark::before,
.page-faq .faq-item[open] .faq-item__mark::after {
  background: var(--violet);
}

.page-faq .faq-item__body {
  padding: 0 4px 26px;
  animation: faq-fade .26s ease both;
}

@keyframes faq-fade {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- 步骤条 ---------- */
.page-faq .step-list {
  list-style: none;
  margin: 4px 0 0 6px;
  padding: 0 0 0 18px;
  border-left: var(--faq-rule);
  display: grid;
}

.page-faq .step-list__item {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 12px 0;
}

.page-faq .step-list__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 19px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dim);
  transition: background-color .3s ease, box-shadow .3s ease;
}

.page-faq .faq-item[open] .step-list__item {
  animation: faq-step .38s ease both;
}

.page-faq .faq-item[open] .step-list__item::before {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(75, 227, 208, .14);
}

.page-faq .faq-item[open] .step-list__item:nth-child(1) { animation-delay: .04s; }
.page-faq .faq-item[open] .step-list__item:nth-child(2) { animation-delay: .12s; }
.page-faq .faq-item[open] .step-list__item:nth-child(3) { animation-delay: .20s; }

@keyframes faq-step {
  from { opacity: 0; transform: translateX(-7px); }
  to   { opacity: 1; transform: none; }
}

.page-faq .step-list__num {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-faq .step-list__text {
  color: var(--body);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .faq-answer {
  margin: 4px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--body);
}

.page-faq .faq-answer--after {
  margin-top: 14px;
}

.page-faq .faq-link {
  color: var(--hi);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color .2s ease, border-color .2s ease;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 大屏示意图 ---------- */
.page-faq .faq-figure {
  position: relative;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: clamp(10px, 1.4vw, 16px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-figure__cap {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--dim);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 未命中提示 ---------- */
.page-faq .faq-open {
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px dashed var(--dim);
  border-radius: var(--radius);
  background: rgba(11, 16, 32, .42);
}

.page-faq .faq-open__title {
  margin: 12px 0 0;
  color: var(--hi);
}

.page-faq .faq-open__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--body);
}

.page-faq .faq-open__links {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-open__links li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 24px;
}

.page-faq .faq-open__links li::before {
  content: "";
  flex: none;
  margin-top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-nav-w) minmax(0, 1fr);
    gap: clamp(48px, 6vw, 96px);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-faq .faq-nav__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    padding: 12px 0 12px 16px;
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    background: transparent;
    border-left-color: var(--violet);
  }

  .page-faq .faq-group:nth-child(odd) .faq-group__head {
    padding-right: clamp(0px, 5vw, 88px);
  }

  .page-faq .faq-figure {
    margin-left: clamp(0px, 4vw, 64px);
  }
}

@media (min-width: 1280px) {
  .page-faq {
    --faq-nav-w: 264px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(56px, 7vw, 104px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__body,
  .page-faq .faq-item[open] .step-list__item {
    animation: none;
    transform: none;
  }

  .page-faq .faq-item[open] .step-list__item:nth-child(n) {
    animation-delay: 0s;
  }

  .page-faq .faq-item__q,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-nav__link,
  .page-faq .faq-nav__num,
  .page-faq .faq-group__num {
    transition: none;
  }
}