.page-faq {
  --faq-dot: 8px;
  --faq-sticky-top: 96px;
  display: block;
}

.page-faq .mono,
.page-faq .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(to bottom, rgba(90, 102, 143, 0.1) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(to right, rgba(90, 102, 143, 0.1) 0 1px, transparent 1px 84px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -12%;
  width: min(520px, 78vw);
  height: min(520px, 78vw);
  background: radial-gradient(circle, rgba(43, 240, 208, 0.18), transparent 62%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  bottom: -34%;
  left: -14%;
  width: min(420px, 66vw);
  height: min(420px, 66vw);
  background: radial-gradient(circle, rgba(255, 107, 44, 0.14), transparent 64%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(26px, 5vw, 60px) clamp(24px, 4vw, 52px);
}

.page-faq .faq-hero__text {
  min-width: 0;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.6vw, 76px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--text);
  max-width: 18ch;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 2;
  color: var(--text-body);
  max-width: 52ch;
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  background: rgba(10, 16, 48, 0.55);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-faq .dot {
  width: var(--faq-dot);
  height: var(--faq-dot);
  border-radius: 50%;
  display: inline-block;
  flex: none;
  background: var(--slate);
}

.page-faq .dot--cyan { background: var(--cyan); }
.page-faq .dot--orange { background: var(--orange); }
.page-faq .dot--amber { background: var(--amber); }
.page-faq .dot--slate { background: var(--slate); }

.page-faq .faq-hero__shot {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__shot .shot__frame {
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: 10px 10px 0 var(--teal-deep);
}

.page-faq .faq-hero__cap,
.page-faq .faq-figure__cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-mute);
  letter-spacing: 0.02em;
}

/* ---------- 筛选与索引 ---------- */
.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .filter-bar__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-mute);
  margin-right: 4px;
}

.page-faq .filter-btn {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border-radius: 0;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

.page-faq .filter-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

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

.page-faq .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-faq .faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  padding-block: clamp(26px, 4.4vw, 56px) clamp(40px, 7vw, 96px);
}

.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index .index-label {
  margin: 0 0 12px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 4px 12px 12px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--text);
  border-left-color: var(--cyan);
  background: rgba(43, 240, 208, 0.06);
  outline: none;
}

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

.page-faq .faq-index__num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-index__name {
  flex: 1 1 auto;
}

.page-faq .faq-index__count {
  font-size: 11px;
  color: var(--text-mute);
}

.page-faq .faq-index__hint {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.85;
  color: var(--text-mute);
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  min-width: 0;
  padding: clamp(18px, 2.6vw, 30px);
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  box-shadow: 8px 8px 0 var(--teal-deep);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.page-faq .faq-group__head .index-label {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 2.5vw, 29px);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-mute);
  max-width: 60ch;
}

.page-faq .faq-list {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-q {
  border-bottom: 1px solid var(--line-soft);
  border-left: 3px solid transparent;
  padding-left: 12px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-q[open] {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(43, 240, 208, 0.08), rgba(43, 240, 208, 0) 46%);
}

.page-faq .faq-q__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--text);
  transition: color var(--dur) var(--ease);
}

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

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

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

.page-faq .faq-q__q::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-faq .faq-q[open] .faq-q__q::after {
  content: "−";
}

.page-faq .faq-q__text { min-width: 0; }

.page-faq .faq-q__meta {
  flex: none;
  align-self: center;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  white-space: nowrap;
  border: 1px solid var(--line-soft);
  padding: 3px 7px;
}

.page-faq .faq-q__a {
  padding: 0 4px 18px 0;
}

.page-faq .faq-q__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-body);
  max-width: 66ch;
}

.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-faq .faq-figure .shot__frame {
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: 8px 8px 0 var(--teal-deep);
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-contact {
  min-width: 0;
  padding: clamp(20px, 3vw, 36px);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(155deg, rgba(43, 240, 208, 0.12), rgba(10, 16, 48, 0) 58%),
    var(--surface);
  box-shadow: 10px 10px 0 rgba(8, 40, 43, 0.85);
}

.page-faq .faq-contact .index-label {
  margin: 0 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-contact__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-faq .faq-contact__lede {
  margin: 14px 0 24px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-body);
  max-width: 62ch;
}

.page-faq .faq-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .faq-contact__block {
  min-width: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-contact__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--text-mute);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

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

.page-faq .faq-contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-grid {
    grid-template-columns: 252px minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1280px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-btn,
  .page-faq .faq-index__link,
  .page-faq .faq-q {
    transition: none;
  }
}