/* ============================================================
   页面专属样式：page-faq
   领域：常见问题解答与垂直折叠面板
   分区：数据更新 / 移动端 / 功能使用 / 其他
   ============================================================ */

.page-faq {
  --faq-deep: #0A1F44;
  --faq-ink: #0F3460;
  --faq-soft: #F4F7FC;
  --faq-line: #D3E2F5;
  --faq-gold: #F6B93B;
  --faq-teal: #00C2A8;
  background: var(--faq-soft);
  color: var(--faq-ink);
  font-family: var(--qsu-font-body);
  overflow-x: hidden;
  line-height: 1.6;
  scroll-behavior: smooth;
}

/* ---------- 面包屑扩展 ---------- */
.page-faq__crumb {
  margin: 0;
  padding-top: 20px;
}

/* ---------- 首屏 Hero ---------- */
.page-faq__hero {
  position: relative;
  margin-top: 20px;
  padding: 34px 24px 42px;
  background:
    radial-gradient(circle at 86% 6%, rgba(0, 194, 168, .20), transparent 46%),
    linear-gradient(135deg, var(--qsu-primary) 0%, var(--qsu-ink) 100%);
  border-radius: 20px;
  color: var(--qsu-paper);
  overflow: hidden;
  isolation: isolate;
  display: grid;
  gap: 24px;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(244, 247, 252, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 247, 252, .045) 1px, transparent 1px);
  background-size: 22px 22px;
  transform: skewY(-9deg) scale(1.12);
  transform-origin: left top;
  pointer-events: none;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--qsu-gold) 0%, var(--qsu-accent) 58%, transparent 100%);
  z-index: 1;
}

.page-faq__hero-main {
  position: relative;
  display: grid;
  gap: 14px;
  justify-items: start;
}

.page-faq__hero h1 {
  margin: 0;
  font-family: var(--qsu-font-head);
  font-size: clamp(1.7rem, 5.2vw, 3rem);
  line-height: 1.12;
  text-wrap: balance;
  letter-spacing: .014em;
}

.page-faq__hero h1 em {
  font-style: normal;
  color: var(--qsu-accent);
}

.page-faq__hero-lead {
  max-width: 34em;
  margin: 0;
  color: var(--qsu-on-dark);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq__hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-faq__hero-stat {
  background: rgba(244, 247, 252, .07);
  border: 1px solid rgba(244, 247, 252, .12);
  border-radius: 14px;
  padding: 13px 10px 12px;
  text-align: left;
}

.page-faq__hero-stat b {
  display: block;
  font-family: var(--qsu-font-data);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--qsu-gold);
  letter-spacing: -.02em;
}

.page-faq__hero-stat span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: rgba(244, 247, 252, .64);
}

/* ---------- 信号线 ---------- */
.page-faq__signal {
  height: 3px;
  margin: 26px 0 0;
  background: linear-gradient(90deg, var(--qsu-gold), var(--qsu-accent) 60%, var(--qsu-line) 100%);
  border-radius: 99px;
  opacity: .9;
}

/* ---------- 左右分屏布局 ---------- */
.page-faq__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding: 34px 0 68px;
}

/* ---------- 侧边分类索引 ---------- */
.page-faq__side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-faq__side-card {
  background: var(--qsu-primary);
  border-radius: 18px;
  padding: 18px 16px;
  display: grid;
  gap: 4px;
}

.page-faq__side-label {
  margin: 0 0 6px;
  padding: 2px 10px 0;
  font-family: var(--qsu-font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--qsu-accent);
  text-transform: uppercase;
}

.page-faq__side-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border-radius: 11px;
  color: rgba(244, 247, 252, .8);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.page-faq__side-link svg {
  flex: 0 0 auto;
  opacity: .72;
  transition: opacity .2s ease;
}

.page-faq__side-link .num {
  flex: 0 0 auto;
  min-width: 18px;
  font-family: var(--qsu-font-data);
  font-size: 11px;
  color: var(--qsu-gold);
}

.page-faq__side-link:first-child {
  background: var(--qsu-gold);
  color: var(--qsu-ink);
}

.page-faq__side-link:first-child svg {
  opacity: 1;
}

.page-faq__side-link:first-child .num {
  color: var(--qsu-ink);
}

.page-faq__side-link:hover,
.page-faq__side-link:focus-visible {
  border-color: rgba(0, 194, 168, .55);
  color: #fff;
}

.page-faq__side-link:first-child:hover,
.page-faq__side-link:first-child:focus-visible {
  border-color: rgba(10, 31, 68, .30);
  color: var(--qsu-ink);
}

/* 分类锚点 :target 激活高亮 */
.page-faq:has(#sec-mobile:target) .page-faq__side-link[href="#sec-update"],
.page-faq:has(#sec-usage:target) .page-faq__side-link[href="#sec-update"],
.page-faq:has(#sec-other:target) .page-faq__side-link[href="#sec-update"] {
  background: transparent;
  color: rgba(244, 247, 252, .8);
}

.page-faq:has(#sec-mobile:target) .page-faq__side-link[href="#sec-update"] .num,
.page-faq:has(#sec-usage:target) .page-faq__side-link[href="#sec-update"] .num,
.page-faq:has(#sec-other:target) .page-faq__side-link[href="#sec-update"] .num {
  color: var(--qsu-gold);
}

.page-faq:has(#sec-mobile:target) .page-faq__side-link[href="#sec-mobile"],
.page-faq:has(#sec-usage:target) .page-faq__side-link[href="#sec-usage"],
.page-faq:has(#sec-other:target) .page-faq__side-link[href="#sec-other"],
.page-faq:has(#sec-update:target) .page-faq__side-link[href="#sec-update"] {
  background: var(--qsu-gold);
  color: var(--qsu-ink);
  border-color: transparent;
}

.page-faq:has(#sec-mobile:target) .page-faq__side-link[href="#sec-mobile"] .num,
.page-faq:has(#sec-usage:target) .page-faq__side-link[href="#sec-usage"] .num,
.page-faq:has(#sec-other:target) .page-faq__side-link[href="#sec-other"] .num,
.page-faq:has(#sec-update:target) .page-faq__side-link[href="#sec-update"] .num {
  color: var(--qsu-ink);
}

/* 侧边帮助卡 */
.page-faq__side-help {
  background: var(--qsu-ink);
  border: 1px solid rgba(246, 185, 59, .32);
  border-radius: 16px;
  padding: 18px 16px;
  color: var(--qsu-on-dark);
  font-size: 13px;
  line-height: 1.6;
  word-break: break-word;
}

.page-faq__side-help p:first-child {
  margin-top: 0;
  font-family: var(--qsu-font-data);
  font-size: 12px;
  letter-spacing: .10em;
  color: var(--qsu-gold);
}

.page-faq__side-help strong {
  color: #fff;
  font-weight: 600;
}

.page-faq__side-help .qsu-btn {
  margin-top: 14px;
}

/* ---------- 内容区 ---------- */
.page-faq__content {
  min-width: 0;
  display: grid;
  gap: 46px;
}

/* ---------- 问题区块 ---------- */
.page-faq__block {
  scroll-margin-top: 100px;
  display: grid;
  gap: 22px;
}

.page-faq__block-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-faq__block-index {
  flex: 0 0 auto;
  min-width: 50px;
  padding: 8px 10px;
  background: var(--qsu-primary);
  color: var(--qsu-gold);
  border-radius: 10px;
  font-family: var(--qsu-font-data);
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
}

.page-faq__block-head h2 {
  margin: 0 0 4px;
  font-family: var(--qsu-font-head);
  font-size: 1.55rem;
  line-height: 1.2;
  letter-spacing: .01em;
}

.page-faq__block-head p {
  margin: 0;
  font-size: 13px;
  color: var(--qsu-muted);
  line-height: 1.55;
}

/* ---------- 图片区 ---------- */
.page-faq__fig {
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  background: var(--qsu-primary);
  border: 1px solid var(--qsu-line);
}

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

.page-faq__fig--wide img {
  max-height: 240px;
}

.page-faq__fig--square img {
  max-height: 320px;
}

.page-faq__fig figcaption {
  padding: 10px 14px;
  font-family: var(--qsu-font-data);
  font-size: 12px;
  color: var(--qsu-cobalt);
}

/* ---------- 移动端区块图文并排 ---------- */
.page-faq__mobile-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

/* ---------- 折叠面板 ---------- */
.page-faq__accordion {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq__item {
  background: #fff;
  border: 1px solid var(--qsu-line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color .22s ease, box-shadow .22s ease;
}

.page-faq__item:hover {
  border-color: var(--qsu-cobalt);
}

.page-faq__item[open] {
  border-color: rgba(0, 194, 168, .50);
  box-shadow: 0 8px 24px rgba(10, 31, 68, .08);
}

.page-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-weight: 600;
  font-size: 16px;
  line-height: 1.4;
  color: var(--qsu-ink);
  transition: color .2s ease;
}

.page-faq__item summary::-webkit-details-marker {
  display: none;
}

.page-faq__item summary:hover {
  color: var(--qsu-cobalt);
}

.page-faq__item-toggle {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--qsu-line);
  color: var(--qsu-primary);
  position: relative;
  transition: transform .25s ease, border-color .25s ease, color .25s ease;
}

.page-faq__item-toggle::before,
.page-faq__item-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.page-faq__item-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: opacity .2s ease;
}

.page-faq__item[open] .page-faq__item-toggle {
  transform: rotate(180deg);
  border-color: var(--qsu-accent);
  color: var(--qsu-accent);
}

.page-faq__item[open] .page-faq__item-toggle::after {
  opacity: 0;
}

.page-faq__a {
  padding: 0 20px 22px;
  color: var(--qsu-muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq__a p {
  margin: 0;
  max-width: 64ch;
}

.page-faq__item[open] .page-faq__a {
  animation: pageFaqFadeIn .28s ease;
}

@keyframes pageFaqFadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq__code {
  font-family: var(--qsu-font-data);
  font-size: 13px;
  background: rgba(0, 194, 168, .10);
  color: var(--qsu-ink);
  border-radius: 5px;
  padding: 2px 7px;
  border: 1px solid rgba(0, 194, 168, .26);
}

/* ---------- 底部 CTA ---------- */
.page-faq__next {
  position: relative;
  margin-top: 6px;
  background: var(--qsu-ink);
  border-radius: 18px;
  padding: 28px 24px 30px;
  color: var(--qsu-paper);
  display: grid;
  gap: 6px;
  overflow: hidden;
}

.page-faq__next::after {
  content: "?";
  position: absolute;
  right: 6px;
  bottom: -42px;
  font-family: var(--qsu-font-head);
  font-size: 9rem;
  color: rgba(244, 247, 252, .06);
  line-height: 1;
  pointer-events: none;
}

.page-faq__next h2 {
  position: relative;
  margin: 0;
  font-family: var(--qsu-font-head);
  font-size: 1.35rem;
  line-height: 1.25;
}

.page-faq__next p {
  position: relative;
  margin: 0;
  color: var(--qsu-on-dark);
  font-size: 14px;
  line-height: 1.7;
}

.page-faq__next a {
  color: var(--qsu-accent);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 194, 168, .40);
  transition: color .2s ease, border-color .2s ease;
}

.page-faq__next a:hover {
  color: var(--qsu-gold);
  border-color: rgba(246, 185, 59, .50);
}

/* ---------- 窄屏适配（510px 以下） ---------- */
@media (max-width: 510px) {
  .page-faq__hero {
    padding: 28px 18px 36px;
    border-radius: 16px;
  }

  .page-faq__hero h1 {
    font-size: 1.6rem;
  }

  .page-faq__hero-stats {
    gap: 6px;
  }

  .page-faq__hero-stat {
    padding: 10px 8px;
  }

  .page-faq__hero-stat b {
    font-size: .98rem;
  }

  .page-faq__hero-stat span {
    font-size: 11px;
  }

  .page-faq__block-index {
    min-width: 42px;
    font-size: 16px;
    padding: 7px 8px;
  }

  .page-faq__item summary {
    padding: 15px 16px;
    font-size: 15px;
  }

  .page-faq__a {
    padding: 0 16px 18px;
  }
}

/* ---------- 平板及以上适配 ---------- */
@media (min-width: 500px) and (max-width: 819px) {
  .page-faq__side-card {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq__side-label {
    grid-column: 1 / -1;
  }
}

@media (min-width: 760px) {
  .page-faq__mobile-grid {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq__fig--square {
    position: sticky;
    top: 100px;
  }
}

/* ---------- 桌面分屏 ---------- */
@media (min-width: 820px) {
  .page-faq__crumb {
    padding-top: 26px;
  }

  .page-faq__hero {
    margin-top: 28px;
    padding: 50px 46px 56px;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: 36px;
  }

  .page-faq__hero-stats {
    gap: 14px;
  }

  .page-faq__layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 48px;
    padding-top: 46px;
    padding-bottom: 84px;
  }

  .page-faq__side {
    position: sticky;
    top: 96px;
  }

  .page-faq__content {
    gap: 54px;
  }

  .page-faq__block {
    gap: 26px;
  }

  .page-faq__block-head {
    gap: 18px;
  }

  .page-faq__block-index {
    min-width: 56px;
    font-size: 20px;
  }

  .page-faq__block-head h2 {
    font-size: 1.85rem;
  }
}

@media (min-width: 1100px) {
  .page-faq__layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 60px;
  }
}

/* ---------- 动画减弱适配 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq {
    scroll-behavior: auto;
  }

  .page-faq__hero::before,
  .page-faq__signal,
  .page-faq__next::after {
    animation: none;
  }

  .page-faq__item[open] .page-faq__a {
    animation: none;
  }

  .page-faq__item summary,
  .page-faq__item-toggle,
  .page-faq__side-link {
    transition: none;
  }
}