/* ========================================================
   page-faq · 答疑中心
   ======================================================== */

.page-faq {
  --faq-body: #AEBDB4;
  --faq-tint: rgba(200, 255, 61, 0.08);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(32px, 5vw, 60px);
  background: var(--pitch-night);
  border-bottom: 1px solid var(--blueprint);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(31, 61, 46, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 61, 46, 0.55) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -42%;
  right: -14%;
  width: 62vw;
  height: 62vw;
  max-width: 720px;
  max-height: 720px;
  background: radial-gradient(circle, rgba(200, 255, 61, 0.15), transparent 62%);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumbs {
  margin: 0 0 clamp(22px, 3vw, 36px);
  font-size: 13px;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7vw, 82px);
  line-height: 0.99;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 64ch;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .faq-hero__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
}

.page-faq .faq-hero__tags .tag {
  padding: 6px 11px;
  border: 1px solid var(--blueprint);
  background: var(--faq-tint);
  color: var(--lime-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

/* ---------- 首屏窄幅图带 ---------- */

.page-faq .faq-strip {
  margin: clamp(24px, 4vw, 44px) 0 0;
  border-bottom: 3px solid var(--lime);
}

/* ---------- 主体：索引 + 问答 ---------- */

.page-faq .faq-body {
  padding-top: clamp(36px, 5vw, 68px);
  padding-bottom: clamp(40px, 6vw, 84px);
  background: var(--pitch-night);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-faq .faq-index {
  align-self: start;
  padding: 20px 18px 22px;
  background: var(--grass-deep);
  border: 1px solid var(--blueprint);
  border-top: 4px solid var(--lime);
}

.page-faq .faq-index__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-faq .faq-index__title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--blueprint);
  color: var(--faq-body);
  font-size: 15px;
  line-height: 1.45;
  text-decoration: none;
  transition: border-color 200ms var(--ease), color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-index__link .mono {
  color: var(--muted);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  transition: color 200ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--lime);
  background: var(--faq-tint);
  color: var(--paper);
}

.page-faq .faq-index__link:hover .mono,
.page-faq .faq-index__link:focus-visible .mono {
  color: var(--lime);
}

.page-faq .faq-index__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--blueprint);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

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

.page-faq .faq-group {
  scroll-margin-top: 120px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5vw, 68px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--blueprint);
}

.page-faq .faq-group__idx {
  margin: 0;
  flex: none;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 33px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-faq .faq-list {
  border-top: 1px solid transparent;
}

/* ---------- 手风琴条目 ---------- */

.page-faq .faq-item {
  border-bottom: 1px solid var(--blueprint);
  background: transparent;
  transition: background 220ms var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, var(--faq-tint), transparent 78%);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: start;
  padding: 18px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.5vw, 18px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  transition: color 200ms var(--ease);
}

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

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

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

.page-faq .faq-item__num {
  padding-top: 4px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-item__icon {
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--blueprint);
  transition: border-color 220ms var(--ease), background 220ms var(--ease);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform 260ms var(--ease), opacity 200ms var(--ease);
}

.page-faq .faq-item__icon::before {
  top: 10px;
  left: 4px;
  right: 4px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  left: 10px;
  top: 4px;
  bottom: 4px;
  width: 2px;
}

.page-faq .faq-item[open] .faq-item__icon {
  border-color: var(--lime);
  background: var(--faq-tint);
}

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

.page-faq .faq-item__a {
  position: relative;
  padding: 0 30px 22px 60px;
}

.page-faq .faq-item__a::before {
  content: "";
  position: absolute;
  top: 2px;
  bottom: 22px;
  left: 30px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, 0));
  transform-origin: top center;
}

.page-faq .faq-item[open] .faq-item__a::before {
  animation: faq-thread 360ms var(--ease) both;
}

@keyframes faq-thread {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--faq-body);
}

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

.page-faq .faq-item__a .link-arrow {
  color: var(--lime-soft);
}

.page-faq .hl {
  padding: 0 4px;
  background: rgba(200, 255, 61, 0.14);
  color: var(--lime-soft);
  font-weight: 600;
}

/* ---------- 自查清单 ---------- */

.page-faq .faq-checklist {
  background: var(--paper);
  color: var(--ink);
}

.page-faq .checklist-head {
  max-width: 62ch;
}

.page-faq .checklist-coord {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-faq .checklist-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .checklist-lede {
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .checklist-figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-faq .check-list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  border-top: 3px solid var(--ink);
}

.page-faq .check-list__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 6px;
  border-bottom: 1px solid rgba(18, 20, 15, 0.2);
  font-size: 16.5px;
  line-height: 1.62;
  color: var(--ink);
  transition: background 200ms var(--ease);
}

.page-faq .check-list__item:hover {
  background: rgba(200, 255, 61, 0.24);
}

.page-faq .check-box {
  flex: none;
  display: inline-flex;
  margin-top: 2px;
  color: var(--ink);
}

.page-faq .check-box svg {
  display: block;
}

.page-faq .checklist-foot {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

/* ---------- 尾部咨询 ---------- */

.page-faq .faq-cta {
  padding: clamp(44px, 6vw, 88px) 0;
  background: var(--pitch-night);
}

.page-faq .faq-cta__panel {
  padding: clamp(26px, 4vw, 52px);
  background: var(--paper);
  border: 2px solid var(--ink);
  border-left: 8px solid var(--signal);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-cta__coord {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-faq .faq-cta__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .faq-cta__text {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .faq-cta__meta {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-faq .faq-cta .btn-row {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */

@media (max-width: 899px) {
  .page-faq .faq-index {
    border-top-width: 4px;
  }

  .page-faq .faq-index__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-index__list > li {
    flex: none;
  }

  .page-faq .faq-index__link {
    flex-direction: column;
    gap: 4px;
    padding: 10px 14px;
    border-left: 0;
    border-bottom: 2px solid var(--blueprint);
    white-space: nowrap;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left: 0;
    border-bottom-color: var(--lime);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(220px, 264px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 116px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item__q {
    grid-template-columns: 26px minmax(0, 1fr) 20px;
    gap: 9px;
    padding: 16px 10px;
  }

  .page-faq .faq-item__a {
    padding: 0 12px 18px 45px;
  }

  .page-faq .faq-item__a::before {
    left: 24px;
  }

  .page-faq .faq-group__head {
    flex-direction: column;
    gap: 6px;
  }

  .page-faq .check-list__item {
    font-size: 15.5px;
    gap: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a::before {
    animation: none;
  }

  .page-faq .faq-item,
  .page-faq .faq-item__icon,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-index__link,
  .page-faq .check-list__item {
    transition: none;
  }
}