.page-faq {
  --faq-item-bg: rgba(12, 30, 48, 0.78);
  --faq-item-bg-open: rgba(12, 30, 48, 0.98);
  --faq-hair: rgba(36, 64, 92, 0.92);
  --faq-glow: rgba(61, 225, 240, 0.16);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 34px) 0 clamp(28px, 5vw, 52px);
  background:
    radial-gradient(70% 60% at 12% 0%, rgba(61, 225, 240, 0.14), transparent 68%),
    radial-gradient(52% 52% at 92% 22%, rgba(44, 125, 255, 0.13), transparent 70%);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-top: clamp(20px, 3.4vw, 34px);
}

.page-faq .faq-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-faq .faq-title__accent {
  display: inline-block;
  color: var(--neon);
  text-shadow: 0 0 22px rgba(61, 225, 240, 0.32);
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 241, 250, 0.82);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-faq .faq-hero__figure {
  margin: 0;
  border-radius: var(--r-card);
}

/* ---------- 提问板 ---------- */
.page-faq .faq-board .tick-rule {
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-faq .faq-tabs {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-faq .faq-tabs__bar {
  display: flex;
  gap: 8px;
  padding: 6px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  background: var(--glass);
  border: 1px solid rgba(61, 225, 240, 0.16);
  border-radius: var(--r-pill);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  scrollbar-width: none;
}

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

.page-faq .faq-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}

.page-faq .faq-tab:hover {
  color: var(--text);
  background: rgba(61, 225, 240, 0.09);
}

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

.page-faq .faq-tab[aria-selected="true"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink);
  font-weight: 700;
}

.page-faq .faq-tab__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
}

.page-faq .faq-tab__dot[data-cat="tier"] { background: var(--lava); }
.page-faq .faq-tab__dot[data-cat="spec"] { background: var(--electric); }
.page-faq .faq-tab__dot[data-cat="warranty"] { background: var(--neon); }
.page-faq .faq-tab__dot[data-cat="consumable"] { background: var(--acid); }
.page-faq .faq-tab__dot[data-cat="network"] { background: var(--violet); }
.page-faq .faq-tab__dot[data-cat="leadtime"] { background: var(--neon); }

.page-faq .faq-panel {
  display: block;
  padding-top: clamp(24px, 3.6vw, 36px);
}

.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel__head {
  max-width: 40em;
}

.page-faq .faq-panel__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-panel__lede {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

.page-faq .faq-panel__figure {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  border-radius: var(--r-card);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-faq .faq-item {
  position: relative;
  background: var(--faq-item-bg);
  border: 1px solid var(--faq-hair);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--neon);
  opacity: 0;
  transform: scaleY(0.25);
  transform-origin: top center;
  transition: opacity var(--t-mid), transform var(--t-mid);
}

.page-faq .faq-item:hover {
  border-color: rgba(61, 225, 240, 0.32);
}

.page-faq .faq-item[open] {
  background: var(--faq-item-bg-open);
  border-color: rgba(61, 225, 240, 0.46);
}

.page-faq .faq-item[open]::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text);
}

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

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

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

.page-faq .faq-item__marker {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color var(--t-fast);
}

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

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

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  margin-left: auto;
  border: 1px solid rgba(159, 179, 200, 0.34);
  border-radius: 50%;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--muted);
  transition: transform var(--t-mid), background var(--t-fast);
}

.page-faq .faq-item__sign::before {
  width: 10px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__sign::after {
  width: 1.5px;
  height: 10px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-item__sign {
  border-color: var(--neon);
  background: rgba(61, 225, 240, 0.12);
}

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

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-item__body {
  padding: 0 16px 16px 40px;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-item__body p {
  margin: 0;
}

.page-faq .faq-item__body p + p {
  margin-top: 10px;
}

.page-faq .faq-num {
  display: inline-block;
  padding: 0 4px;
  font-family: var(--font-mono);
  font-size: 0.94em;
  color: var(--text);
  background: rgba(61, 225, 240, 0.13);
  border-radius: 4px;
}

/* ---------- 联系引导 ---------- */
.page-faq .faq-help__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 34px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid rgba(61, 225, 240, 0.28);
  border-radius: var(--r-card);
  background:
    linear-gradient(140deg, rgba(61, 225, 240, 0.1), rgba(44, 125, 255, 0.05) 46%, transparent 74%),
    var(--glass-strong);
}

.page-faq .faq-help__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-help__desc {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 0;
  border: 1px solid var(--faq-hair);
  border-radius: var(--r-data);
  background: var(--graphite);
  overflow: hidden;
}

.page-faq .faq-help__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(36, 64, 92, 0.72);
}

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

.page-faq .faq-help__key {
  flex: 0 0 auto;
  min-width: 5.4em;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-help__val {
  flex: 1 1 12em;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-faq .faq-help__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-faq .faq-help__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid rgba(61, 225, 240, 0.24);
  border-radius: var(--r-pill);
  background: rgba(23, 51, 80, 0.42);
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--t-fast), background var(--t-fast), color var(--t-fast);
}

.page-faq .faq-help__link:hover,
.page-faq .faq-help__link:focus-visible {
  border-color: var(--neon);
  background: rgba(61, 225, 240, 0.14);
  color: var(--neon);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-item__q {
    padding: 17px 22px;
    gap: 14px;
  }

  .page-faq .faq-item__body {
    padding: 0 22px 20px 56px;
  }

  .page-faq .faq-list {
    gap: 12px;
  }

  .page-faq .faq-help__row {
    padding: 13px 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-faq .faq-hero__figure {
    max-width: 520px;
    justify-self: end;
  }

  .page-faq .faq-list {
    max-width: 900px;
  }

  .page-faq .faq-panel__figure {
    max-width: 640px;
  }

  .page-faq .faq-help__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }
}

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