/* ===== 答疑中心 · /faq/ ===== */
.page-faq {
  --faq-rule: rgba(34, 224, 224, .28);
  --faq-rule-soft: rgba(139, 155, 196, .16);
  --faq-body: rgba(234, 240, 255, .86);
  display: block;
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 60px) 0 clamp(30px, 4.4vw, 58px);
  background: linear-gradient(180deg, rgba(22, 34, 74, .58) 0%, rgba(5, 6, 14, 0) 82%);
  border-bottom: 1px solid var(--faq-rule-soft);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -56%;
  right: -16%;
  width: min(680px, 94vw);
  height: 158%;
  background:
    linear-gradient(128deg, rgba(255, 46, 126, .24) 0%, rgba(255, 46, 126, 0) 46%),
    linear-gradient(128deg, rgba(34, 224, 224, .18) 20%, rgba(34, 224, 224, 0) 62%);
  transform: rotate(-7deg) skewX(-13deg);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(234, 240, 255, .04) 0 1px,
    rgba(234, 240, 255, 0) 1px 4px
  );
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 46px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-hero .lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 4px 0 0;
  padding: 0;
  max-width: 560px;
  background: var(--faq-rule-soft);
  border: 1px solid var(--faq-rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-stats > div {
  display: grid;
  gap: 5px;
  padding: 13px 14px;
  background: rgba(11, 18, 38, .86);
}

.page-faq .faq-stats dt {
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 主布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(32px, 4vw, 56px);
}

.page-faq .faq-side {
  display: grid;
  gap: 14px;
  align-content: start;
  min-width: 0;
}

.page-faq .faq-side__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  min-width: 0;
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-filter .filter-btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-faq .faq-filter .filter-btn[aria-pressed="true"],
.page-faq .faq-filter .filter-btn.is-active {
  color: var(--paper);
  border-color: var(--magenta);
  background: linear-gradient(120deg, rgba(255, 46, 126, .24), rgba(34, 224, 224, .12));
}

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

.page-faq .filter-count {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-side__jump {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed var(--faq-rule);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-side__jump:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 问答堆叠 ---------- */
.page-faq .faq-stack {
  display: grid;
  gap: clamp(30px, 4.2vw, 54px);
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 104px;
}

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 12px;
  margin-bottom: 2px;
  border-bottom: 1px solid var(--faq-rule-soft);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(190px, 44%);
  height: 2px;
  background: linear-gradient(90deg, var(--magenta), var(--cyan));
}

.page-faq .faq-group__index {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(21px, 2.7vw, 27px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-figure {
  position: relative;
  margin: 18px 0 14px;
  border: 1px solid var(--faq-rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-faq .faq-figure .media__label,
.page-faq .faq-aside .media__label {
  position: static;
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--muted);
  background: rgba(11, 18, 38, .92);
  border-top: 1px solid var(--faq-rule-soft);
  border-left: 2px solid var(--cyan);
}

/* ---------- 单条问答 ---------- */
.page-faq .faq-items {
  min-width: 0;
}

.page-faq .faq-item {
  position: relative;
  padding-left: 16px;
  border-bottom: 1px solid var(--faq-rule-soft);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(34, 224, 224, .07), rgba(34, 224, 224, 0) 44%);
}

.page-faq .faq-item[open]::before {
  background: linear-gradient(180deg, var(--cyan), rgba(34, 224, 224, .04));
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 17px 6px 17px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.42;
  letter-spacing: -.005em;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-q:hover {
  color: var(--cyan);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--magenta);
  outline-offset: 3px;
}

.page-faq .faq-q__mark {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 1px solid var(--faq-rule);
  border-radius: 50%;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
}

.page-faq .faq-q__mark::before {
  width: 10px;
  height: 1.5px;
}

.page-faq .faq-q__mark::after {
  width: 1.5px;
  height: 10px;
  transition: opacity var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-q__mark {
  border-color: var(--magenta);
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-q__mark::after {
  opacity: 0;
}

.page-faq .faq-a {
  max-width: 74ch;
  padding: 0 6px 22px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .steps {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: fstep;
}

.page-faq .steps > li {
  position: relative;
  counter-increment: fstep;
  padding-left: 36px;
}

.page-faq .steps > li::before {
  content: counter(fstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  width: 22px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  line-height: 1.4;
  color: var(--cyan);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .steps .mono {
  color: var(--paper);
}

.page-faq .faq-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--faq-rule-soft);
}

.page-faq .faq-copy__val {
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-faq .faq-copy__val .mono {
  color: var(--paper);
  font-size: 13px;
}

/* ---------- 配置组的图文分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  padding-top: 4px;
}

.page-faq .faq-aside {
  margin: 0;
  border: 1px solid var(--faq-rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

/* ---------- 反馈清单 ---------- */
.page-faq .faq-feedback {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 72px);
  padding: clamp(22px, 4vw, 44px);
  background: linear-gradient(140deg, rgba(22, 34, 74, .78), rgba(5, 6, 14, .92) 68%);
}

.page-faq .faq-feedback h2 {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3.1vw, 31px);
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-faq .faq-feedback .lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-checklist {
  display: grid;
  gap: 1px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  background: var(--faq-rule-soft);
  border: 1px solid var(--faq-rule-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-faq .faq-checklist > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  background: rgba(11, 18, 38, .88);
}

.page-faq .faq-checklist__idx {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-faq .faq-checklist__body {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-faq .faq-checklist__body strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .faq-checklist__body > span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-checklist__body .mono {
  color: var(--paper);
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-feedback__links {
  margin: 0;
  padding-top: 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  border-top: 1px solid var(--faq-rule-soft);
}

.page-faq .faq-feedback__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 224, .35);
}

.page-faq .faq-feedback__links a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats dd {
    font-size: 18px;
  }

  .page-faq .faq-checklist > li {
    padding: 16px 20px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(34px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 106px;
  }

  .page-faq .faq-filter {
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-filter .filter-btn {
    width: 100%;
    text-align: left;
    justify-content: flex-start;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 292px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-q,
  .page-faq .faq-q__mark,
  .page-faq .faq-q__mark::after {
    transition: none;
  }
}