.page-faq {
  --faq-sticky: calc(var(--header-h) + 64px);
  --faq-card: rgba(16, 20, 26, 0.72);
  background: var(--night);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 封面 ---------- */
.page-faq .faq-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.2vw, 48px) 0 clamp(34px, 5.4vw, 68px);
  border-bottom: 1px solid var(--hair);
  background:
    radial-gradient(940px 520px at 84% -18%, rgba(242, 169, 59, 0.20), transparent 60%),
    radial-gradient(700px 480px at 2% 108%, rgba(56, 225, 208, 0.10), transparent 64%),
    radial-gradient(560px 420px at 54% 34%, rgba(164, 107, 255, 0.09), transparent 72%),
    var(--night);
}

.page-faq .faq-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(20px, 3.4vw, 42px);
}

.page-faq .faq-cover__title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(2.1rem, 6.6vw, 4.6rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-cover__lead .lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 52ch;
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-quickcard {
  position: relative;
  border: 1px solid var(--gold-line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 2.6vw, 28px);
  background:
    linear-gradient(158deg, rgba(242, 169, 59, 0.10), rgba(7, 9, 12, 0.4) 58%),
    var(--faq-card);
  overflow: hidden;
}

.page-faq .faq-quickcard::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 225, 208, 0.18), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-quickcard__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-quicklist {
  margin-top: 14px;
  display: grid;
  gap: 0;
}

.page-faq .faq-quicklist li {
  display: grid;
  grid-template-columns: minmax(5.4em, auto) 1fr;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--hair);
}

.page-faq .faq-quicklist .num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-faq .faq-quicklist__text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-faq .faq-quickcard__note {
  margin-top: 16px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  border-bottom: 1px solid var(--hair);
  background: rgba(7, 9, 12, 0.92);
  backdrop-filter: blur(14px);
}

.page-faq .faq-toc__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  padding-top: 12px;
  padding-bottom: 12px;
}

.page-faq .faq-toc__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--gold-deep);
  text-transform: uppercase;
}

.page-faq .faq-toc__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 30px);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-toc__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 2px;
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-faq .faq-toc__list a .num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gold-deep);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--gold-lift);
  border-bottom-color: var(--gold);
}

.page-faq .faq-toc__list a:hover .num,
.page-faq .faq-toc__list a:focus-visible .num {
  color: var(--gold);
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-group {
  padding: clamp(42px, 6.4vw, 88px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--hair);
  scroll-margin-top: calc(var(--header-h) + 72px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2vw, 24px);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-group__code {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold-line);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-group__title {
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin-top: 8px;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-faq .faq-group__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}

/* ---------- 手风琴 ---------- */
.page-faq .expand-group {
  border-top: 1px solid var(--hair);
}

.page-faq .expand-item {
  border-bottom: 1px solid var(--hair);
}

.page-faq .expand-trigger {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 20px 2px;
  border: 0;
  background: none;
  font-family: inherit;
  font-size: clamp(0.98rem, 1.5vw, 1.06rem);
  font-weight: 600;
  line-height: 1.6;
  text-align: left;
  color: var(--paper);
  cursor: pointer;
  transition: color 220ms var(--ease);
}

.page-faq .expand-trigger:hover,
.page-faq .expand-trigger:focus-visible {
  color: var(--gold-lift);
}

.page-faq .expand-sign {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 4px;
  border: 1px solid var(--gold-line);
  border-radius: 50%;
  transition: transform 240ms var(--ease), border-color 240ms var(--ease);
}

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

.page-faq .expand-sign::before {
  width: 9px;
  height: 1.5px;
}

.page-faq .expand-sign::after {
  width: 1.5px;
  height: 9px;
  transition: opacity 240ms var(--ease);
}

.page-faq .expand-trigger[aria-expanded="true"] {
  color: var(--gold);
}

.page-faq .expand-trigger[aria-expanded="true"] .expand-sign {
  transform: rotate(45deg);
  border-color: var(--gold);
}

.page-faq .expand-panel {
  max-width: 64ch;
  padding: 0 clamp(2px, 1vw, 12px) clamp(20px, 2.6vw, 28px) 2px;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .expand-panel p + p {
  margin-top: 12px;
}

.page-faq .expand-panel strong {
  font-weight: 700;
  color: var(--gold-lift);
}

.page-faq .expand-panel:not([hidden]) {
  animation: faqPanelIn 240ms var(--ease);
}

@keyframes faqPanelIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 图例卡 ---------- */
.page-faq .faq-legend {
  position: relative;
  border: 1px solid var(--gold-line);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 2.4vw, 24px);
  background:
    linear-gradient(160deg, rgba(242, 169, 59, 0.09), rgba(16, 20, 26, 0.55) 56%),
    var(--faq-card);
}

.page-faq .faq-legend::before {
  content: "";
  position: absolute;
  left: clamp(18px, 2.4vw, 24px);
  right: clamp(18px, 2.4vw, 24px);
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(242, 169, 59, 0));
  border-radius: 2px;
}

.page-faq .faq-legend__label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-legend__list {
  margin-top: 16px;
  display: grid;
}

.page-faq .faq-legend__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--hair);
  font-size: 0.86rem;
}

.page-faq .faq-legend__list li:last-child {
  border-bottom: 0;
}

.page-faq .faq-legend__key {
  color: var(--silver);
  flex: none;
}

.page-faq .faq-legend__val {
  text-align: right;
  color: var(--paper);
  font-weight: 600;
}

.page-faq .faq-legend__val.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-faq .faq-legend__media {
  margin-top: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius-md);
}

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

/* ---------- 尾部支持区 ---------- */
.page-faq .faq-help {
  margin-top: clamp(52px, 7vw, 96px);
  border: 1px solid var(--gold-line);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3.6vw, 52px);
  background:
    radial-gradient(620px 380px at 96% 8%, rgba(56, 225, 208, 0.12), transparent 66%),
    linear-gradient(150deg, rgba(242, 169, 59, 0.10), rgba(7, 9, 12, 0.62) 60%),
    var(--char);
}

.page-faq .faq-help__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
  align-items: start;
}

.page-faq .faq-help__title {
  margin-top: 12px;
  font-size: clamp(1.4rem, 3vw, 2.3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-faq .faq-help__text {
  margin-top: 16px;
  max-width: 52ch;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-checklist {
  margin-top: 22px;
  display: grid;
  gap: 10px;
}

.page-faq .faq-checklist li {
  position: relative;
  padding-left: 22px;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 11px;
  height: 1.5px;
  background: var(--gold);
}

.page-faq .faq-contact {
  margin-top: clamp(24px, 3vw, 34px);
  display: grid;
  gap: 12px;
  padding-top: clamp(18px, 2.4vw, 24px);
  border-top: 1px solid var(--hair);
}

.page-faq .faq-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
}

.page-faq .faq-contact__row .contact-key {
  flex: none;
  min-width: 5.4em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
  text-transform: uppercase;
}

.page-faq .faq-contact__row .contact-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-help__actions {
  margin-top: clamp(24px, 3vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-faq .faq-help__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-faq .faq-help__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-faq .faq-legend {
    position: sticky;
    top: var(--faq-sticky);
  }
}

@media (max-width: 480px) {
  .page-faq .faq-quicklist li {
    grid-template-columns: minmax(4.4em, auto) 1fr;
    gap: 10px;
  }

  .page-faq .faq-quicklist .num {
    font-size: 1.15rem;
  }

  .page-faq .faq-group__code {
    font-size: 1.3rem;
  }

  .page-faq .faq-contact__row .contact-key {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .expand-panel:not([hidden]) {
    animation: none;
  }

  .page-faq .expand-sign,
  .page-faq .expand-trigger,
  .page-faq .faq-toc__list a {
    transition: none;
  }
}