.page-faq {
  --faq-edge: 3px;
  display: block;
}

/* ---------- 顶部 ---------- */
.page-faq .faq-top {
  padding-top: clamp(20px, 4vw, 44px);
}

.page-faq .faq-top__grid {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
  margin-top: 26px;
}

.page-faq .faq-top__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 10px 0 18px;
  max-width: 18ch;
}

.page-faq .faq-top__text {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-top__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-top__side {
  padding: 22px 20px 20px;
  align-self: start;
}

.page-faq .faq-top__side-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon);
  text-transform: uppercase;
}

.page-faq .faq-quick {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-faq .faq-quick a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  border: 2px solid transparent;
  border-left: var(--faq-edge) solid var(--neon);
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.page-faq .faq-quick a:hover,
.page-faq .faq-quick a:focus-visible {
  background: rgba(139, 92, 246, 0.14);
  border-color: rgba(139, 92, 246, 0.55);
  transform: translateX(2px);
}

.page-faq .faq-quick__n {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-faq .faq-top__status {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 2px solid var(--line-soft);
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-faq .sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 8px 0 12px;
}

.page-faq .sec__lead {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .sec__lead a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(34, 211, 238, 0.45);
}

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

/* ---------- 索引卡 ---------- */
.page-faq .faq-cards {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  margin: 30px 0 26px;
}

.page-faq .faq-card {
  display: grid;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  color: var(--ink);
  position: relative;
  transition: transform 170ms ease, border-color 170ms ease, box-shadow 170ms ease;
}

.page-faq .faq-card:hover,
.page-faq .faq-card:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hard);
  border-color: var(--cyan);
}

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

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

.page-faq .faq-card__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-faq .faq-card--amber .faq-card__n {
  color: var(--amber);
}

.page-faq .faq-card--neon .faq-card__n {
  color: var(--neon);
}

.page-faq .faq-card__t {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
}

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

.page-faq .faq-card__c {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  padding-top: 8px;
  border-top: 2px solid var(--line-soft);
}

/* ---------- 筛选 ---------- */
.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px;
  background: var(--void);
  border: 2px solid var(--line);
}

.page-faq .filter-btn {
  appearance: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 10px 14px;
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--line);
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

.page-faq .filter-btn[aria-pressed="true"] {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--void);
  font-weight: 700;
}

/* ---------- 问答区块 ---------- */
.page-faq .faq-block {
  position: relative;
}

.page-faq .faq-block::before {
  content: "";
  display: block;
  height: 2px;
  margin-bottom: clamp(24px, 3vw, 38px);
  background: linear-gradient(90deg, var(--neon), var(--cyan) 55%, transparent);
  opacity: 0.55;
}

.page-faq .faq-figure {
  margin: 26px 0 0;
}

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

.page-faq .qa-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .qa {
  background: var(--panel);
  border: 2px solid var(--line);
  border-left: var(--faq-edge) solid var(--cyan);
  box-shadow: var(--shadow-soft);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.page-faq .qa--neon {
  border-left-color: var(--neon);
}

.page-faq .qa--amber {
  border-left-color: var(--amber);
}

.page-faq .qa--cyan {
  border-left-color: var(--cyan);
}

.page-faq .qa[open] {
  box-shadow: var(--shadow-hard);
}

.page-faq .qa--neon[open] {
  border-color: var(--neon);
}

.page-faq .qa--amber[open] {
  border-color: var(--amber);
}

.page-faq .qa--cyan[open] {
  border-color: var(--cyan);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.55;
  color: var(--ink);
  transition: background 160ms ease;
}

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

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

.page-faq .qa__q:hover {
  background: rgba(255, 255, 255, 0.035);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-faq .qa__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  padding-top: 4px;
}

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

.page-faq .qa__chev {
  flex: 0 0 auto;
  position: relative;
  width: 12px;
  height: 12px;
  margin-top: 7px;
  margin-left: 6px;
}

.page-faq .qa__chev::before,
.page-faq .qa__chev::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}

.page-faq .qa__chev::before {
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
}

.page-faq .qa__chev::after {
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .qa--neon .qa__chev {
  color: var(--neon);
}

.page-faq .qa--amber .qa__chev {
  color: var(--amber);
}

.page-faq .qa--cyan .qa__chev {
  color: var(--cyan);
}

.page-faq .qa[open] .qa__chev::before {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 0 18px 18px 44px;
  border-top: 2px solid var(--line-soft);
  margin: 0 0 0 0;
}

.page-faq .qa__a p {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(34, 211, 238, 0.45);
}

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

.page-faq .hl {
  font-family: var(--font-mono);
  font-size: 0.94em;
  font-weight: 700;
  color: var(--amber);
  padding: 0 2px;
}

/* ---------- 联系 ---------- */
.page-faq .faq-channels {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 30px;
}

.page-faq .faq-channel {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 2px solid var(--line);
  border-top: 6px solid var(--neon);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-channel--amber {
  border-top-color: var(--amber);
}

.page-faq .faq-channel--cyan {
  border-top-color: var(--cyan);
}

.page-faq .faq-channel--neon {
  border-top-color: var(--neon);
}

.page-faq .faq-channel__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-channel__value {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-channel--amber .faq-channel__value {
  color: var(--amber);
}

.page-faq .faq-channel--cyan .faq-channel__value {
  color: var(--cyan);
}

.page-faq .faq-channel__desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-channel__desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(34, 211, 238, 0.45);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-faq .faq-top__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-faq .faq-top__side {
    margin-top: 46px;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card,
  .page-faq .faq-quick a,
  .page-faq .filter-btn,
  .page-faq .qa,
  .page-faq .qa__chev::before,
  .page-faq .qa__chev::after {
    transition: none;
  }

  .page-faq .faq-card:hover,
  .page-faq .faq-card:focus-visible,
  .page-faq .faq-quick a:hover,
  .page-faq .faq-quick a:focus-visible {
    transform: none;
  }
}