/* =========================================================
   问答中心 /questions/
   ========================================================= */

.page-faq {
  --faq-nav-offset: calc(var(--masthead-h) + 24px);
  display: block;
}

/* ---------- 首屏：深色框景 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--space);
  color: var(--paper);
  border-bottom: 4px solid var(--ink);
  padding-top: calc(var(--masthead-h) + clamp(28px, 6vw, 76px));
  padding-bottom: clamp(36px, 6vw, 68px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(127, 211, 242, 0.09) 0 1px,
    transparent 1px 96px
  );
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: 62%;
  height: 96%;
  background: var(--penguin);
  opacity: 0.42;
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-faq .faq-hero > .u-shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-faq .faq-hero .breadcrumb__link {
  color: var(--ice);
}

.page-faq .faq-hero .breadcrumb__item {
  color: rgba(214, 222, 232, 0.72);
}

.page-faq .faq-hero .u-eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  color: var(--mint);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-title);
  font-size: clamp(34px, 7vw, 78px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 60ch;
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 4px solid var(--ice);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  color: rgba(214, 222, 232, 0.88);
}

.page-faq .faq-hero__fig {
  margin: 0;
  border: var(--bw) solid var(--ice);
  box-shadow: 8px 8px 0 rgba(127, 211, 242, 0.24);
  background: var(--penguin);
  overflow: hidden;
}

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

/* 首屏数据条 */

.page-faq .faq-hero__stats {
  list-style: none;
  margin: clamp(30px, 4.6vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: rgba(127, 211, 242, 0.3);
  border: var(--bw) solid rgba(127, 211, 242, 0.3);
}

.page-faq .faq-stat {
  background: var(--space);
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
}

.page-faq .faq-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-faq .faq-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(214, 222, 232, 0.7);
}

/* ---------- 主体两栏：索引 + 问答 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(36px, 5vw, 72px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

/* 左侧索引 */

.page-faq .faq-index {
  border: var(--bw) solid var(--ink);
  background: var(--silver);
  box-shadow: var(--shadow-hard);
  padding: 18px 16px 20px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--penguin);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 3px solid transparent;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease),
    color 0.16s var(--ease);
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-faq .faq-index__link:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

@media (hover: hover) {
  .page-faq .faq-index__link:hover {
    background: var(--white);
    border-left-color: var(--ice);
    color: var(--penguin);
  }
}

/* 右侧问答列 */

.page-faq .faq-panels {
  display: grid;
  gap: clamp(40px, 5vw, 72px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: var(--faq-nav-offset);
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
  padding-bottom: 14px;
  border-bottom: 4px solid var(--ink);
}

.page-faq .faq-group__head .u-index {
  font-family: var(--font-mono);
  font-size: clamp(36px, 5.4vw, 58px);
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--penguin);
  opacity: 0.2;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(21px, 3.1vw, 32px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-group__meta {
  flex: 1 1 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* 折叠问答 */

.page-faq .faq-group__items {
  display: grid;
  gap: 14px;
}

.page-faq .faq-item {
  border: var(--bw) solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow-hard);
  transition: box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-item[open] {
  box-shadow: 8px 8px 0 var(--penguin);
}

@media (hover: hover) {
  .page-faq .faq-item:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--ink);
  }

  .page-faq .faq-item[open]:hover {
    box-shadow: 8px 8px 0 var(--penguin);
  }

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

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15px, 1.9vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  transition: color 0.16s var(--ease);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: -3px;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: 2px solid var(--ink);
  background: var(--ice);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-faq .faq-item__mark::before {
  width: 10px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 10px;
}

.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(135deg);
  background: var(--mint);
}

.page-faq .faq-item__a {
  padding: 0 18px 18px 54px;
  border-top: 1px dashed var(--silver);
  margin-top: 0;
  padding-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

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

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

/* 行内链接 */

.page-faq .faq-inline {
  color: var(--penguin);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--ice);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.page-faq .faq-inline:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

@media (hover: hover) {
  .page-faq .faq-inline:hover {
    background: var(--ice);
    color: var(--space);
  }
}

/* 配图 */

.page-faq .faq-fig {
  margin: clamp(22px, 3vw, 30px) 0 0;
  border: var(--bw) solid var(--penguin);
  box-shadow: var(--shadow-hard);
  background: var(--space);
  overflow: hidden;
}

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

.page-faq .faq-fig__cap {
  padding: 10px 14px;
  border-top: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ice);
}

/* 收尾行动区 */

.page-faq .faq-cta {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: clamp(22px, 3.4vw, 38px);
  display: grid;
  gap: 22px;
  background: var(--space);
  color: var(--paper);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--white);
}

.page-faq .faq-cta__desc {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(214, 222, 232, 0.85);
}

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

.page-faq .faq-cta__actions .btn:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */

@media (max-width: 479px) {
  .page-faq .faq-item__a {
    padding-left: 18px;
  }

  .page-faq .faq-item__q {
    gap: 12px;
    padding: 14px 15px;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 236px) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-hero__lede {
    max-width: 66ch;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 268px) minmax(0, 1fr);
    gap: clamp(40px, 4.4vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__q,
  .page-faq .faq-index__link,
  .page-faq .faq-inline {
    transition: none;
  }
}