.page-faq {
  --faq-pad-card: clamp(18px, 2.6vw, 24px);
  --faq-pad-section: clamp(26px, 5vw, 52px);
  --faq-gap-vertical: clamp(24px, 4vw, 40px);
  background-color: var(--color-void);
  color: var(--color-surface);
  overflow-x: clip;
}

.page-faq [id] {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ===== Hero 框景 ===== */
.page-faq .faq-hero {
  position: relative;
  min-height: 520px;
  padding: calc(var(--header-h) + 36px) 0 56px;
  background: linear-gradient(135deg, var(--color-void) 0%, #10224a 55%, var(--color-void) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
  filter: saturate(0.85) contrast(1.06);
}

.page-faq .faq-hero__grain {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(141, 215, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 215, 255, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
  z-index: 1;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
}

.page-faq .faq-hero__corner {
  position: absolute;
  width: 56px;
  height: 56px;
  z-index: 3;
  pointer-events: none;
  opacity: 0.9;
}

.page-faq .faq-hero__corner--tl {
  top: 20px;
  left: clamp(12px, 3vw, 32px);
  border-top: 3px solid var(--color-flare);
  border-left: 3px solid var(--color-flare);
}

.page-faq .faq-hero__corner--br {
  right: clamp(12px, 3vw, 32px);
  bottom: 20px;
  border-right: 3px solid var(--color-flare);
  border-bottom: 3px solid var(--color-flare);
}

.page-faq .faq-hero .eyebrow--flare {
  margin-bottom: 14px;
}

.page-faq .faq-hero .display-title {
  margin: 0 0 18px;
  font-size: clamp(38px, 8vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lede {
  max-width: 620px;
  margin: 0 0 32px;
  font-family: var(--font-serif);
  font-size: clamp(15px, 2.4vw, 19px);
  line-height: 1.72;
  color: var(--text-main);
}

.page-faq .faq-search {
  max-width: 680px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  padding: 16px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  backdrop-filter: blur(8px);
  transition: border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-faq .faq-search:focus-within {
  border-color: var(--color-pulse);
  box-shadow: 0 0 0 3px rgba(123, 47, 255, 0.24);
}

.page-faq .faq-search__fields {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-faq .faq-search__icon {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--color-frost);
}

.page-faq .faq-search__input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(141, 215, 255, 0.35);
  color: var(--color-surface);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 8px 2px;
  outline: none;
}

.page-faq .faq-search__input::placeholder {
  color: rgba(245, 247, 250, 0.5);
}

.page-faq .faq-search__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-faq .faq-search__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-flare);
}

.page-faq .faq-search__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-frost);
  border: 1px solid rgba(141, 215, 255, 0.35);
  padding: 4px 10px;
  text-decoration: none;
  transition: background 0.25s var(--ease-out), color 0.25s var(--ease-out), border-color 0.25s;
}

.page-faq .faq-search__tag:hover,
.page-faq .faq-search__tag:focus-visible {
  background: var(--color-frost);
  color: var(--color-void);
  border-color: var(--color-frost);
}

/* ===== 分隔刻度 ===== */
.page-faq .faq-ruler {
  position: relative;
  max-width: var(--container-max);
  height: 1px;
  margin: 28px auto 0;
  background: linear-gradient(90deg, transparent 0%, var(--color-pulse) 30%, var(--color-pulse) 70%, transparent 100%);
}

.page-faq .faq-ruler::after {
  content: "◆";
  position: absolute;
  right: max(24px, 6%);
  top: -9px;
  color: var(--color-flare);
  font-size: 12px;
}

/* ===== 面包屑容器 ===== */
.page-faq .container.breadcrumb {
  margin: clamp(24px, 4vw, 44px) auto 0;
}

/* ===== 主体布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap-vertical);
  padding-block: 40px 72px;
}

.page-faq .faq-sidebar {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-faq .faq-index {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-faq .faq-index__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-flare);
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  padding: 11px 6px;
  border-bottom: 1px solid rgba(141, 215, 255, 0.14);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 15px;
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out), padding-left 0.2s var(--ease-out);
}

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

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: rgba(123, 47, 255, 0.16);
  color: var(--color-frost);
  padding-left: 12px;
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-pulse);
}

.page-faq .faq-index__title {
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ===== 支持卡片 ===== */
.page-faq .faq-support {
  background: linear-gradient(145deg, rgba(123, 47, 255, 0.2), rgba(11, 29, 58, 0.82));
  border: 1px solid rgba(123, 47, 255, 0.42);
  padding: 24px 18px 26px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.page-faq .faq-support__img {
  width: 84px;
  height: 84px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--color-frost);
  background: var(--color-void);
  aspect-ratio: 1 / 1;
  margin-bottom: 4px;
}

.page-faq .faq-support__title {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  color: var(--color-surface);
  letter-spacing: -0.01em;
}

.page-faq .faq-support__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-faq .faq-support .btn--ghost {
  margin-top: 6px;
}

/* ===== 主内容区 ===== */
.page-faq .faq-main {
  position: relative;
  min-width: 0;
}

.page-faq .faq-main::before {
  content: "⌑ ⌑ ⌑";
  position: absolute;
  top: -10px;
  right: 14px;
  color: var(--color-flare);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 6px;
  z-index: 2;
}

/* ===== 章节面板 ===== */
.page-faq .faq-section {
  position: relative;
  padding: var(--faq-pad-section);
  background: linear-gradient(150deg, rgba(141, 215, 255, 0.07), rgba(11, 29, 58, 0.55));
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-pulse);
  box-shadow: var(--shadow-card);
  margin-bottom: var(--faq-gap-vertical);
}

.page-faq .faq-section--light {
  background: var(--color-surface);
  border-color: rgba(10, 14, 23, 0.1);
  border-left: 4px solid var(--color-flare);
  color: var(--color-ink);
  box-shadow: 0 16px 44px rgba(10, 14, 23, 0.28);
}

.page-faq .faq-section__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
}

.page-faq .faq-section__head .stamp {
  flex-shrink: 0;
  transform: rotate(-6deg);
  margin-top: 2px;
}

.page-faq .faq-section__title {
  margin: 0 0 6px;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: -0.015em;
  color: inherit;
}

.page-faq .faq-section__intro {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.6;
  color: inherit;
  opacity: 0.68;
}

/* ===== FAQ 手风琴卡片 ===== */
.page-faq .faq-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-card {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--color-border);
  transition: border-color 0.3s var(--ease-out), background 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-faq .faq-card:hover {
  border-color: var(--color-pulse);
}

.page-faq .faq-card[open] {
  background: rgba(123, 47, 255, 0.08);
  border-color: var(--color-pulse);
  box-shadow: 0 10px 36px rgba(123, 47, 255, 0.2);
}

.page-faq .faq-section--light .faq-card {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(10, 14, 23, 0.14);
}

.page-faq .faq-section--light .faq-card:hover {
  border-color: var(--color-flare);
}

.page-faq .faq-section--light .faq-card[open] {
  background: #ffffff;
  border-color: var(--color-pulse);
  box-shadow: 0 12px 40px rgba(10, 14, 23, 0.14);
}

.page-faq .faq-card__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: var(--faq-pad-card);
  cursor: pointer;
  list-style: none;
  user-select: none;
  -webkit-user-select: none;
}

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

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

.page-faq .faq-card__index {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-flare);
  background: rgba(255, 106, 0, 0.12);
  padding: 3px 8px;
  line-height: 1.3;
}

.page-faq .faq-section--light .faq-card__index {
  background: rgba(255, 106, 0, 0.12);
  color: #b34a00;
}

.page-faq .faq-card__title {
  flex: 1;
  min-width: 0;
  font-family: var(--font-sans);
  font-size: clamp(15px, 2vw, 17px);
  font-weight: 700;
  line-height: 1.5;
  color: inherit;
}

.page-faq .faq-card__icon {
  position: relative;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--color-frost);
}

.page-faq .faq-card__icon::before,
.page-faq .faq-card__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform 0.3s var(--ease-out), color 0.3s var(--ease-out);
}

.page-faq .faq-card__icon::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq-card__icon::after {
  width: 2px;
  height: 14px;
}

.page-faq .faq-card[open] .faq-card__icon {
  color: var(--color-pulse);
}

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

.page-faq .faq-card__body {
  margin: 0;
  padding: 14px var(--faq-pad-card) var(--faq-pad-card);
  border-top: 1px solid rgba(141, 215, 255, 0.16);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.78;
  color: inherit;
  opacity: 1;
  animation: page-faq-card-reveal 0.35s var(--ease-out);
}

.page-faq .faq-section--light .faq-card__body {
  border-top-color: rgba(10, 14, 23, 0.09);
}

.page-faq .faq-card__body p {
  margin: 0 0 10px;
}

.page-faq .faq-card__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-inline-link {
  color: var(--color-frost);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(141, 215, 255, 0.5);
  transition: color 0.2s var(--ease-out), text-decoration-color 0.2s var(--ease-out);
}

.page-faq .faq-section--light .faq-inline-link {
  color: #4a20a8;
  text-decoration-color: rgba(74, 32, 168, 0.4);
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--color-flare);
  text-decoration-color: var(--color-flare);
}

@keyframes page-faq-card-reveal {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 数据速览条 ===== */
.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: var(--faq-gap-vertical);
  background: linear-gradient(135deg, rgba(123, 47, 255, 0.18), rgba(11, 29, 58, 0.92));
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-stats__item {
  padding: 24px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  border-right: 1px solid rgba(141, 215, 255, 0.14);
  border-bottom: 1px solid rgba(141, 215, 255, 0.14);
  transition: background 0.25s var(--ease-out);
}

.page-faq .faq-stats__item:nth-child(2n) {
  border-right: 0;
}

.page-faq .faq-stats__item:nth-child(n + 3) {
  border-bottom: 0;
}

.page-faq .faq-stats__item:hover {
  background: rgba(141, 215, 255, 0.08);
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--color-frost);
}

.page-faq .faq-stats__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* ===== 延伸阅读 ===== */
.page-faq .faq-outro {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-pulse);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-outro__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-flare);
}

.page-faq .faq-outro__item {
  color: var(--color-frost);
  font-size: 15px;
  font-family: var(--font-sans);
  font-weight: 500;
  text-decoration: none;
  line-height: 1.5;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(141, 215, 255, 0.2);
  transition: padding-left 0.25s var(--ease-out), color 0.2s var(--ease-out);
}

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

.page-faq .faq-outro__item:hover,
.page-faq .faq-outro__item:focus-visible {
  color: var(--color-surface);
  padding-left: 12px;
}

/* ===== 平板 ===== */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .faq-stats__item {
    border-right: 1px solid rgba(141, 215, 255, 0.14);
    border-bottom: 0;
  }

  .page-faq .faq-stats__item:nth-child(2n) {
    border-right: 1px solid rgba(141, 215, 255, 0.14);
  }

  .page-faq .faq-stats__item:last-child {
    border-right: 0;
  }

  .page-faq .faq-search {
    padding: 18px 22px 16px;
  }
}

/* ===== 桌面 ===== */
@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(240px, 280px) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    padding-block: 56px 96px;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-faq .faq-hero {
    min-height: 560px;
    padding: calc(var(--header-h) + 48px) 0 72px;
  }

  .page-faq .faq-hero__corner--tl {
    top: 28px;
  }

  .page-faq .faq-hero__corner--br {
    bottom: 28px;
  }
}

/* ===== 减弱动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card[open] .faq-card__body {
    animation: none;
  }

  .page-faq .faq-card__icon::before,
  .page-faq .faq-card__icon::after {
    transition: none;
  }

  .page-faq .faq-search__tag,
  .page-faq .faq-index__link,
  .page-faq .faq-outro__item,
  .page-faq .faq-card,
  .page-faq .faq-stats__item {
    transition: none;
  }
}