.page-faq {
  --faq-shell-pad: clamp(1.25rem, 4vw, 2.5rem);
  --faq-accent-alpha: rgba(183, 255, 0, 0.12);
  --faq-solar-alpha: rgba(255, 138, 0, 0.12);
  position: relative;
  background:
    radial-gradient(circle at 82% 4%, rgba(11, 42, 69, 0.7), transparent 34rem),
    var(--color-bg);
  color: var(--color-body);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: clip;
}

.page-faq .faq-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3.5rem) var(--faq-shell-pad) clamp(3rem, 6vw, 5rem);
}

.page-faq a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(117, 211, 245, 0.3);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq a:hover {
  color: var(--color-heading);
  border-bottom-color: var(--color-accent);
}

.page-faq a.btn {
  display: inline-block;
  border-bottom: none;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq svg {
  flex-shrink: 0;
}

/* 面包屑 */
.page-faq .breadcrumbs {
  margin-bottom: 1.4rem;
}

.page-faq .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.page-faq .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--color-line);
}

.page-faq .breadcrumbs__link {
  color: var(--color-muted);
}

.page-faq .breadcrumbs__link:hover {
  color: var(--color-link);
}

/* Hero 首屏标题区 */
.page-faq .help-hero {
  display: grid;
  gap: 2rem;
  align-items: center;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq .help-hero__kicker {
  display: inline-block;
  margin: 0 0 0.8rem;
  padding: 0.3rem 0.8rem 0.3rem 0.6rem;
  background: var(--faq-accent-alpha);
  border-left: 3px solid var(--color-accent);
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  text-transform: uppercase;
  transform: skewX(-12deg);
}

.page-faq .help-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-heading);
}

.page-faq .help-hero__lead {
  max-width: 36rem;
  margin: 0;
  font-size: 1.05rem;
  color: var(--color-body);
}

/* 问题速查工具栏 */
.page-faq .help-toolbar {
  margin-top: 1.8rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}

.page-faq .help-toolbar__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
  color: var(--color-heading);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-faq .help-toolbar__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.page-faq .help-filter {
  appearance: none;
  border: 1px solid var(--color-line);
  background: transparent;
  color: var(--color-body);
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.2;
  padding: 0.45rem 0.9rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.page-faq .help-filter:hover,
.page-faq .help-filter:focus-visible {
  border-color: var(--color-link);
  color: var(--color-heading);
  outline: none;
}

.page-faq .help-filter[aria-pressed="true"] {
  border-color: var(--color-accent);
  background: var(--faq-accent-alpha);
  color: var(--color-heading);
}

/* Hero 视觉区 */
.page-faq .help-hero__visual {
  position: relative;
}

.page-faq .help-hero__img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: 22px 8px 22px 8px;
  background: var(--color-card);
}

.page-faq .help-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  position: absolute;
  right: -0.5rem;
  bottom: 1rem;
  background: rgba(4, 16, 27, 0.92);
  border: 1px solid var(--color-accent);
  border-radius: 10px 4px 10px 4px;
  padding: 0.55rem 1rem;
  color: var(--color-heading);
  box-shadow: var(--shadow);
}

.page-faq .help-hero__stat-num {
  font-family: var(--font-num);
  font-size: 1.7rem;
  color: var(--color-accent);
}

.page-faq .help-hero__stat-label {
  font-size: 0.76rem;
  color: var(--color-body);
  letter-spacing: 0.03em;
}

/* 主布局：侧边栏 + 内容 */
.page-faq .help-layout {
  display: grid;
  gap: 2rem;
}

.page-faq .faq-content {
  order: 1;
  min-width: 0;
}

.page-faq .faq-aside {
  order: 2;
  min-width: 0;
}

/* 侧边栏 */
.page-faq .faq-aside__visual {
  margin-bottom: 1.4rem;
}

.page-faq .faq-aside__img {
  display: block;
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: 18px 6px 18px 6px;
  background: var(--color-card);
}

.page-faq .faq-aside__nav {
  margin-top: 1.6rem;
  padding: 1.2rem 1.3rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
}

.page-faq .faq-aside__nav h3,
.page-faq .faq-aside__contact h3 {
  margin: 0 0 0.9rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--color-heading);
}

.page-faq .faq-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-aside__list a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.25rem 0;
  color: var(--color-body);
  border-bottom: 1px dashed rgba(18, 59, 92, 0.7);
}

.page-faq .faq-aside__list a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-faq .faq-aside__list span {
  font-family: var(--font-num);
  font-size: 0.8rem;
  color: var(--color-accent);
}

.page-faq .faq-aside__stats {
  display: grid;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

.page-faq .faq-aside__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  border-radius: 12px 4px 12px 4px;
  padding: 0.9rem 1rem;
}

.page-faq .faq-aside__stat-num {
  font-family: var(--font-num);
  font-size: 1.8rem;
  line-height: 1;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-faq .faq-aside__stat-label {
  font-size: 0.82rem;
  color: var(--color-body);
  text-align: right;
}

.page-faq .faq-aside__contact {
  margin-top: 1.2rem;
  padding: 1.2rem 1.3rem 1.3rem;
  background: linear-gradient(135deg, rgba(7, 27, 47, 0.9), rgba(4, 16, 27, 0.9));
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-solar);
  border-radius: 14px 4px 14px 4px;
}

.page-faq .faq-aside__contact p {
  margin: 0 0 1.1rem;
  font-size: 0.88rem;
  color: var(--color-body);
}

.page-faq .btn--ghost {
  font-size: 0.88rem;
  padding: 0.5rem 1.1rem;
}

/* FAQ 分组 */
.page-faq .faq-group {
  scroll-margin-top: 5.5rem;
}

.page-faq .faq-group + .faq-group {
  margin-top: 2.8rem;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--color-line);
  margin-bottom: 1.15rem;
}

.page-faq .faq-group__num {
  font-family: var(--font-num);
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-heading);
}

.page-faq .faq-group__count {
  margin-left: auto;
  padding: 0.2rem 0.75rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  border-radius: 50px;
  font-family: var(--font-num);
  font-size: 0.75rem;
  color: var(--color-muted);
  white-space: nowrap;
}

/* 手风琴问题卡 */
.page-faq .faq-group__list {
  display: grid;
  gap: 0.85rem;
}

.page-faq .faq-item {
  border: 1px solid var(--color-line);
  background: var(--color-card);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-faq .faq-item:hover {
  border-color: rgba(117, 211, 245, 0.5);
}

.page-faq .faq-item[open] {
  border-color: var(--color-accent);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.3);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1.05rem 1.2rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--color-heading);
  transition: color 0.2s ease;
}

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

.page-faq .faq-item__summary::before {
  content: "Q";
  flex-shrink: 0;
  font-family: var(--font-num);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-accent);
  border: 1px solid currentColor;
  border-radius: 5px 2px 5px 2px;
  padding: 0.08rem 0.32rem;
}

.page-faq .faq-item__summary::after {
  content: "+";
  flex-shrink: 0;
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--color-muted);
  transition: transform 0.25s ease, color 0.25s ease;
}

.page-faq .faq-item[open] .faq-item__summary::after {
  content: "−";
  transform: rotate(180deg);
  color: var(--color-accent);
}

.page-faq .faq-item__summary:hover {
  color: var(--color-accent);
}

.page-faq .faq-item__body {
  padding: 0 1.2rem 1.15rem 1.2rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--color-body);
}

.page-faq .faq-item__body p {
  margin: 0 0 0.9rem;
}

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

/* 代码块风格提示框 */
.page-faq .faq-tip {
  margin-top: 1rem;
  padding: 0.85rem 1rem 0.85rem 1.05rem;
  background: #06182a;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 10px 10px 0;
  font-family: var(--font-num);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

.page-faq .faq-tip__label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-faq .faq-tip code {
  font-family: var(--font-num);
  color: var(--color-body);
  white-space: normal;
}

.page-faq .faq-tip--solar {
  border-left-color: var(--color-solar);
}

.page-faq .faq-tip--solar .faq-tip__label {
  color: var(--color-solar);
}

/* 桌面端断点 */
@media (min-width: 640px) {
  .page-faq .help-toolbar__filters {
    gap: 0.65rem;
  }

  .page-faq .faq-tip {
    max-width: 30rem;
  }
}

@media (min-width: 900px) {
  .page-faq .help-hero {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.5rem;
  }

  .page-faq .help-hero__text {
    padding-right: 1rem;
  }

  .page-faq .help-layout {
    grid-template-columns: 280px 1fr;
    gap: 2.4rem;
    align-items: start;
  }

  .page-faq .faq-content,
  .page-faq .faq-aside {
    order: 0;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 6.5rem;
  }

  .page-faq .faq-group__head {
    margin-bottom: 1.3rem;
  }
}

@media (min-width: 1200px) {
  .page-faq .help-hero {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
  }

  .page-faq .help-layout {
    grid-template-columns: 310px 1fr;
  }
}