.page-faq {
  --faq-anchor: calc(var(--ig-header-h) + 28px);
  --faq-hairline: rgba(36, 52, 80, 0.7);
  background: var(--ig-void);
  color: var(--ig-silver);
  font-family: var(--ig-font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(40px, 8vw, 104px) 0 clamp(36px, 6vw, 68px);
  background:
    radial-gradient(120% 88% at 86% 4%, rgba(111, 243, 220, 0.12), transparent 58%),
    radial-gradient(80% 60% at 8% 96%, rgba(200, 255, 61, 0.07), transparent 62%),
    linear-gradient(180deg, var(--ig-board) 0%, var(--ig-void) 82%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--ig-steel) 22%, var(--ig-cyan) 62%, transparent 100%);
  opacity: 0.6;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-faq .faq-hero__crumbs {
  margin-bottom: 20px;
}

.page-faq .faq-hero__crumbs a {
  color: var(--ig-mist);
  text-decoration: none;
}

.page-faq .faq-hero__crumbs a:hover {
  color: var(--ig-cyan);
}

.page-faq .faq-hero__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--ig-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ig-mist);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-family: var(--ig-font-display);
  font-size: clamp(32px, 7.2vw, 66px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ig-white);
  transform: skewX(-1.5deg);
  max-width: 13em;
}

.page-faq .faq-hero__lead {
  margin: 0 0 30px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ig-silver);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 48px);
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-hairline);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-stat .ig-num {
  font-family: var(--ig-font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  color: var(--ig-lime);
  line-height: 1;
}

.page-faq .faq-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ig-mist);
}

.page-faq .ig-media {
  margin: 0;
  border-radius: var(--ig-radius-m);
  overflow: hidden;
  background: linear-gradient(140deg, var(--ig-line), var(--ig-void));
}

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

.page-faq .faq-hero__media {
  border-radius: var(--ig-blob);
  box-shadow: 0 30px 80px -40px rgba(111, 243, 220, 0.35);
}

.page-faq .faq-hero__media .ig-media__img {
  aspect-ratio: 3 / 2;
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-filter {
  background: var(--ig-board);
  border-bottom: 1px solid var(--faq-hairline);
}

.page-faq .faq-filter__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.page-faq .faq-filter__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-filter__status {
  margin: 0;
  font-family: var(--ig-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ig-mist);
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding: clamp(40px, 6vw, 80px) 0 clamp(48px, 7vw, 96px);
  background:
    linear-gradient(180deg, var(--ig-void) 0%, var(--ig-board) 46%, var(--ig-void) 100%);
}

.page-faq .faq-body__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

/* 索引 */
.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--ig-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ig-mist);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--ig-radius-s);
  border: 1px solid var(--ig-line);
  background: rgba(22, 35, 58, 0.55);
  color: var(--ig-silver);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color 0.2s var(--ig-ease), background 0.2s var(--ig-ease), border-color 0.2s var(--ig-ease);
}

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

.page-faq .faq-index__no {
  font-family: var(--ig-font-mono);
  font-size: 11px;
  color: var(--ig-mist);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: rgba(200, 255, 61, 0.5);
  color: var(--ig-white);
}

.page-faq .faq-index__link[aria-current="true"] {
  background: rgba(200, 255, 61, 0.08);
  border-color: var(--ig-lime);
  color: var(--ig-white);
}

.page-faq .faq-index__link[aria-current="true"] .faq-index__letter {
  color: var(--ig-lime);
}

.page-faq .faq-index__note {
  display: none;
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ig-mist);
}

/* 分组 */
.page-faq .faq-groups {
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  padding: clamp(8px, 2vw, 16px) 0;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
}

.page-faq .faq-group__letter {
  font-family: var(--ig-font-mono);
  font-size: clamp(42px, 9vw, 78px);
  font-weight: 700;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--ig-steel);
  letter-spacing: -0.02em;
}

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

.page-faq .faq-group__title {
  margin: 0 0 8px;
  font-family: var(--ig-font-display);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ig-white);
  transform: skewX(-1.5deg);
}

.page-faq .faq-group__lead {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ig-mist);
}

.page-faq .faq-group__media {
  border-radius: var(--ig-radius-l);
}

.page-faq .faq-group__media .ig-media__img {
  aspect-ratio: 1 / 1;
}

.page-faq .faq-group__media .ig-media__caption {
  display: block;
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ig-mist);
  background: rgba(13, 22, 38, 0.9);
}

/* 折叠问答 */
.page-faq .faq-list {
  border-top: 1px solid var(--faq-hairline);
}

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

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 34px 18px 4px;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--ig-silver);
  transition: color 0.2s var(--ig-ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--ig-font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--ig-lime);
  transition: transform 0.2s var(--ig-ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
}

.page-faq .faq-item__q:hover {
  color: var(--ig-white);
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--ig-white);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  font-family: var(--ig-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ig-lime);
  letter-spacing: 0.04em;
}

.page-faq .faq-item__a {
  padding: 0 34px 20px 4px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ig-silver);
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-answer-in 240ms var(--ig-ease) both;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 色带分隔 */
.page-faq .faq-band {
  height: 5px;
  margin: clamp(30px, 5vw, 52px) 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ig-lime) 0%, var(--ig-cyan) 38%, rgba(36, 52, 80, 0) 100%);
  opacity: 0.5;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  padding: clamp(44px, 6vw, 84px) 0;
  background: linear-gradient(120deg, var(--ig-line) 0%, var(--ig-void) 68%);
  border-top: 1px solid var(--faq-hairline);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-faq .faq-cta__eyebrow {
  margin: 0 0 10px;
  font-family: var(--ig-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ig-cyan);
}

.page-faq .faq-cta__title {
  margin: 0 0 12px;
  font-family: var(--ig-font-display);
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ig-white);
  transform: skewX(-1.5deg);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ig-silver);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-group__head--split {
    grid-template-columns: minmax(0, 1fr) 200px;
    align-items: start;
  }

  .page-faq .faq-group__head--split .faq-group__letter {
    grid-column: 1 / -1;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    justify-items: start;
  }

  .page-faq .faq-cta__actions {
    justify-content: flex-end;
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-faq .faq-body__inner {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: clamp(40px, 4vw, 72px);
  }

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

  .page-faq .faq-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

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

  .page-faq .faq-index__link {
    justify-content: flex-start;
    width: 100%;
    padding: 12px 14px;
    border-color: transparent;
    background: transparent;
    border-left: 2px solid var(--ig-steel);
    border-radius: 0 var(--ig-radius-s) var(--ig-radius-s) 0;
  }

  .page-faq .faq-index__link[aria-current="true"] {
    border-left-color: var(--ig-lime);
  }

  .page-faq .faq-index__no {
    margin-left: auto;
  }

  .page-faq .faq-index__note {
    display: block;
  }

  .page-faq .faq-group__head {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-faq .faq-group__letter {
    font-size: 64px;
  }

  .page-faq .faq-group__head--split {
    grid-template-columns: minmax(0, 1fr) 220px;
  }

  .page-faq .faq-group__head--split .faq-group__letter {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}