.page-faq {
  --faq-grid: 88px;
  position: relative;
  color: var(--phx-white);
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--phx-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--phx-line) 1px, transparent 1px);
  background-size: var(--faq-grid) var(--faq-grid);
  opacity: 0.6;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 42%, transparent 94%);
  mask-image: linear-gradient(to bottom, #000 0, #000 42%, transparent 94%);
}

.page-faq > * {
  position: relative;
}

/* ---------- 首屏 ---------- */

.page-faq__hero {
  padding: clamp(36px, 6vw, 84px) 0 0;
}

.page-faq__crumbs {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-faq__h1 {
  margin: 12px 0 0;
  max-width: 21ch;
  font-family: var(--phx-font-display);
  font-size: clamp(27px, 5.2vw, 54px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--phx-white);
}

.page-faq__hero-lede {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 66ch;
  font-size: clamp(14.5px, 1.7vw, 16.5px);
  line-height: 1.85;
  color: var(--phx-mist);
}

.page-faq__banner {
  margin: clamp(26px, 4vw, 46px) 0 0;
  border: 1px solid var(--phx-line);
}

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

/* ---------- 目录 + 正文双栏 ---------- */

.page-faq__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(28px, 4.4vw, 56px);
}

@media (min-width: 920px) {
  .page-faq__body {
    grid-template-columns: minmax(172px, 214px) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 68px);
    align-items: start;
  }
}

.page-faq__toc {
  min-width: 0;
}

@media (min-width: 920px) {
  .page-faq__toc {
    position: sticky;
    top: 108px;
  }
}

.page-faq__toc-title {
  margin: 0;
  font-family: var(--phx-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--phx-mist);
}

.page-faq__toc-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq__toc-list::-webkit-scrollbar {
  display: none;
}

.page-faq__toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--phx-line);
  border-radius: var(--phx-radius);
  background: var(--phx-glass);
  color: var(--phx-mist);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--phx-ease), border-color 0.18s var(--phx-ease), background-color 0.18s var(--phx-ease);
}

.page-faq__toc-link .phx-mono {
  font-size: 11px;
  color: var(--phx-violet);
}

.page-faq__toc-link:hover,
.page-faq__toc-link:focus-visible {
  color: var(--phx-white);
  border-color: var(--phx-neon);
  background: var(--phx-glass-strong);
  outline: none;
}

@media (min-width: 920px) {
  .page-faq__toc-list {
    display: block;
    overflow: visible;
    margin-top: 14px;
    border-left: 1px solid var(--phx-line);
  }

  .page-faq__toc-list li + li {
    border-top: 1px solid var(--phx-line);
  }

  .page-faq__toc-link {
    position: relative;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    padding: 11px 12px;
  }

  .page-faq__toc-link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--phx-neon);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.2s var(--phx-ease);
  }

  .page-faq__toc-link:hover::before,
  .page-faq__toc-link:focus-visible::before {
    transform: scaleY(1);
  }

  .page-faq__toc-link:hover,
  .page-faq__toc-link:focus-visible {
    background: var(--phx-glass);
  }
}

/* ---------- 问答分组 ---------- */

.page-faq__main {
  min-width: 0;
}

.page-faq__group {
  position: relative;
  scroll-margin-top: 116px;
  padding-block: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--phx-line);
}

.page-faq__group:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq__group:target .phx-eyebrow {
  color: var(--phx-neon);
}

.page-faq__group .page-faq__h2 {
  margin: 10px 0 0;
  font-family: var(--phx-font-display);
  font-size: clamp(21px, 2.9vw, 31px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--phx-white);
}

.page-faq__group .phx-lede {
  margin-top: 12px;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.7vw, 16px);
  line-height: 1.82;
  color: var(--phx-mist);
}

/* ---------- 路径节点 ---------- */

.page-faq__path {
  list-style: none;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-faq__path-node {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px 18px 18px 20px;
  background: var(--phx-glass);
  border: 1px solid var(--phx-line);
  border-left: 2px solid var(--phx-neon);
  border-radius: var(--phx-radius);
}

.page-faq__path-node::after {
  content: "";
  position: absolute;
  left: 26px;
  bottom: -19px;
  width: 1px;
  height: 18px;
  background: var(--phx-line);
}

.page-faq__path-node:last-child::after {
  display: none;
}

.page-faq__path-index {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--phx-violet);
}

.page-faq__path-name {
  font-family: var(--phx-font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--phx-white);
}

.page-faq__path-note {
  font-size: 14px;
  line-height: 1.72;
  color: var(--phx-mist);
}

@media (min-width: 760px) {
  .page-faq__path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-faq__path-node::after {
    left: calc(100% + 2px);
    bottom: auto;
    top: 50%;
    width: 28px;
    height: 1px;
    transform: translateY(-50%);
    background: linear-gradient(to right, var(--phx-neon), transparent);
  }
}

/* ---------- 读法图例 ---------- */

.page-faq__legend {
  list-style: none;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 760px) {
  .page-faq__legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-faq__legend-item {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px 18px 20px;
  background: var(--phx-glass);
  border: 1px solid var(--phx-line);
  border-radius: var(--phx-radius);
}

.page-faq__legend-key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--phx-neon);
}

.page-faq__legend-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--phx-mist);
}

.page-faq__legend-item .phx-mark {
  vertical-align: middle;
}

/* ---------- 刷新时间线 ---------- */

.page-faq__timeline {
  list-style: none;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--phx-line);
  display: grid;
  gap: 16px;
}

.page-faq__timeline li {
  position: relative;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--phx-mist);
}

.page-faq__timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--phx-neon);
  box-shadow: 0 0 0 3px rgba(47, 243, 161, 0.14);
}

.page-faq__timeline .phx-mono {
  display: block;
  margin-bottom: 2px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--phx-white);
}

/* ---------- 双端对照 ---------- */

.page-faq__compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  background: var(--phx-line);
  border: 1px solid var(--phx-line);
}

@media (min-width: 700px) {
  .page-faq__compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq__compare-col {
  background: var(--phx-coal);
  padding: 20px 20px 24px;
}

.page-faq__compare-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--phx-font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--phx-white);
}

.page-faq__compare-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq__compare-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--phx-mist);
}

.page-faq__compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  background: var(--phx-line);
  border: 1px solid var(--phx-mist);
}

/* ---------- 历史索引数字条 ---------- */

.page-faq__stats {
  list-style: none;
  margin: clamp(20px, 2.8vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq__stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  background: var(--phx-glass);
  border: 1px solid var(--phx-line);
  font-size: 13px;
  color: var(--phx-mist);
}

.page-faq__stats strong {
  font-family: var(--phx-font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--phx-neon);
}

/* ---------- 联系区 ---------- */

.page-faq__contact-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(22px, 3.2vw, 32px);
}

@media (min-width: 820px) {
  .page-faq__contact-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-faq__contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--phx-line);
  border: 1px solid var(--phx-line);
}

.page-faq__contact-list li {
  display: grid;
  gap: 5px;
  padding: 13px 16px;
  background: var(--phx-glass);
}

.page-faq__contact-label {
  font-family: var(--phx-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--phx-mist);
}

.page-faq__contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--phx-white);
  word-break: break-word;
}

.page-faq__shot {
  margin: 0;
  border: 1px solid var(--phx-line);
}

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

/* ---------- 问答折叠 ---------- */

.page-faq__qa {
  margin-top: clamp(20px, 2.8vw, 30px);
  border-top: 1px solid var(--phx-line);
}

.page-faq__item {
  border-bottom: 1px solid var(--phx-line);
  transition: background-color 0.18s var(--phx-ease);
}

.page-faq__item[open] {
  background: var(--phx-glass);
}

.page-faq__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--phx-font-display);
  font-size: clamp(15px, 1.7vw, 16.5px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--phx-white);
  transition: color 0.18s var(--phx-ease);
}

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

.page-faq__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--phx-font-mono);
  font-size: 15px;
  color: var(--phx-neon);
}

.page-faq__item[open] .page-faq__q::after {
  content: "–";
}

.page-faq__q:hover,
.page-faq__q:focus-visible {
  color: var(--phx-neon);
  outline: none;
}

.page-faq__a {
  margin: 0;
  padding: 0 6px 20px;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--phx-mist);
}

.page-faq__a a {
  color: var(--phx-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq__a a:hover,
.page-faq__a a:focus-visible {
  color: var(--phx-white);
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq__toc-link,
  .page-faq__toc-link::before,
  .page-faq__item,
  .page-faq__q {
    transition: none;
  }
}