.page-faq {
  --faq-gap: clamp(18px, 2.6vw, 34px);
  --faq-accent: var(--cyan);
  --faq-body-max: 38ch;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(28px, 5vw, 56px)) 0 clamp(44px, 6vw, 80px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -12%;
  width: min(62vw, 720px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 209, 224, 0.16), transparent 64%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

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

.page-faq .breadcrumb a:hover {
  color: var(--gold);
}

.page-faq .faq-sep {
  color: var(--line);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-hero__title {
  font-size: clamp(32px, 7vw, 60px);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 14px 0 0;
  color: var(--paper);
}

.page-faq .faq-hero__lead .lede {
  margin-top: 20px;
  max-width: 34em;
  color: var(--mist);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-stats {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
}

.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-stat__num {
  font-size: clamp(22px, 2.4vw, 30px);
  color: var(--gold);
  line-height: 1;
}

.page-faq .faq-stat__key {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__media .media__frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(10, 59, 55, 0.7), rgba(11, 16, 48, 0.9));
  aspect-ratio: 10 / 7;
}

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

/* ---------- 四组索引 ---------- */
.page-faq .faq-index {
  list-style: none;
  margin: clamp(36px, 5vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-index__item {
  background: var(--ink-900);
  --idx-accent: var(--cyan);
}

.page-faq .faq-index__item:nth-child(1) { --idx-accent: var(--cyan); }
.page-faq .faq-index__item:nth-child(2) { --idx-accent: var(--amber); }
.page-faq .faq-index__item:nth-child(3) { --idx-accent: var(--gold); }
.page-faq .faq-index__item:nth-child(4) { --idx-accent: var(--coral); }

.page-faq .faq-index__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 48px;
  padding: 20px 18px 24px;
  text-decoration: none;
  border-top: 2px solid var(--idx-accent);
  transition: background-color 220ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: var(--ink-800);
}

.page-faq .faq-index__num {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--idx-accent);
}

.page-faq .faq-index__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-faq .faq-index__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 分组区 ---------- */
.page-faq .faq-groups {
  padding-top: clamp(40px, 6vw, 84px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-faq .faq-head {
  max-width: 46em;
}

.page-faq .faq-head .section-title {
  margin-top: 12px;
}

.page-faq .faq-head__lede {
  margin-top: 16px;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
  max-width: 34em;
}

.page-faq .faq-filter {
  margin: clamp(24px, 3.2vw, 38px) 0 clamp(28px, 3.6vw, 44px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-filter .filter-btn {
  min-height: 44px;
  padding: 9px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: inherit;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .faq-filter .filter-btn:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-faq .faq-filter .filter-btn[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
}

.page-faq .faq-stack {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-faq .faq-group {
  position: relative;
  padding: clamp(20px, 2.8vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(21, 27, 68, 0.66), rgba(11, 16, 48, 0.8));
  --accent: var(--cyan);
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}

.page-faq .faq-group--nav { --accent: var(--cyan); }
.page-faq .faq-group--tag { --accent: var(--amber); }
.page-faq .faq-group--member { --accent: var(--gold); }
.page-faq .faq-group--help { --accent: var(--coral); }

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: clamp(18px, 2.2vw, 26px);
  padding-left: 6px;
}

.page-faq .faq-group__idx {
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--accent);
  line-height: 1.7;
  flex: none;
}

.page-faq .faq-group__title {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0;
}

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

.page-faq .faq-group__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-left: 6px;
}

/* ---------- 问答项 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 16, 48, 0.42);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .faq-item[open] {
  border-color: var(--accent);
  background: rgba(11, 16, 48, 0.72);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  min-height: 48px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  transition: color 200ms var(--ease);
}

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

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

.page-faq .faq-item__q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--accent);
  transition: transform 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .faq-item__sign::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 1.5px;
}

.page-faq .faq-item__sign::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 1.5px;
}

.page-faq .faq-item[open] .faq-item__sign::before {
  background: var(--gold);
}

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

.page-faq .faq-item__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--line-soft);
  margin-top: -4px;
  padding-top: 16px;
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  max-width: var(--faq-body-max);
}

.page-faq .faq-item__body p:last-of-type {
  margin-bottom: 16px;
}

.page-faq .faq-item__body .link-more {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 178, 204, 0.3);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-item__body .link-more:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.page-faq .faq-item__body .link-more::after {
  content: "→";
  margin-left: 8px;
  font-family: var(--font-mono);
}

/* ---------- 三步图解 ---------- */
.page-faq .faq-steps {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-step-rail {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-step {
  position: relative;
  background: rgba(11, 16, 48, 0.35);
  padding: clamp(22px, 2.8vw, 34px) clamp(18px, 2.4vw, 28px);
  padding-top: calc(clamp(22px, 2.8vw, 34px) + 4px);
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--gold));
}

.page-faq .faq-step__num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-faq .faq-step__name {
  margin: 12px 0 0;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-step__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 30ch;
}

.page-faq .faq-steps__media {
  margin: clamp(32px, 4.4vw, 56px) 0 0;
}

.page-faq .faq-steps__media .media__frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(62, 16, 36, 0.6), rgba(11, 16, 48, 0.9));
  aspect-ratio: 12 / 7;
}

.page-faq .faq-steps__media .media__caption {
  margin-top: 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 排查路径 ---------- */
.page-faq .faq-path {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-path__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
}

.page-faq .faq-path__rail {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
}

.page-faq .faq-path__rail::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--gold) 55%, var(--coral));
}

.page-faq .faq-path__node {
  position: relative;
  padding-bottom: 2px;
}

.page-faq .faq-path__dot {
  position: absolute;
  left: -25px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink-900);
}

.page-faq .faq-path__step {
  display: block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-faq .faq-path__name {
  margin: 8px 0 0;
  font-size: clamp(18px, 1.9vw, 22px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-path__text {
  margin: 8px 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34ch;
}

.page-faq .faq-path__node .link-more {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--cyan);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 209, 224, 0.28);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-path__node .link-more:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.page-faq .faq-path__node .link-more::after {
  content: "→";
  margin-left: 8px;
  font-family: var(--font-mono);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-faq .faq-group__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-faq .faq-step-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-path__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-group {
    padding: clamp(26px, 2.8vw, 40px);
  }
}

@media (max-width: 400px) {
  .page-faq .faq-group__head {
    gap: 10px;
  }

  .page-faq .faq-item__body p {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-item,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-filter .filter-btn,
  .page-faq .faq-item__body .link-more,
  .page-faq .faq-path__node .link-more {
    transition: none;
  }
}