.page-faq {
  --faq-card-bg: rgba(18, 42, 84, 0.42);
  --faq-card-strong: rgba(18, 42, 84, 0.68);
  background: var(--navy-deep);
  color: var(--cloud);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-faq .container {
  max-width: var(--container);
}

/* ===== 首屏标题区 ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 38px 38px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 180px;
  height: 4px;
  background: var(--grad-accent);
  opacity: 0.7;
}

.page-faq .faq-hero__inner {
  padding: clamp(2rem, 5vw, 4rem) 0 clamp(2rem, 4vw, 3rem);
}

.page-faq .faq-hero__head {
  margin-top: 2rem;
}

.page-faq .faq-hero__kicker {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 0.6rem;
}

.page-faq .faq-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.05;
  color: var(--white);
  margin: 0 0 0.7rem;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.page-faq .faq-hero__desc {
  max-width: var(--max-line);
  color: var(--silver);
  font-size: 0.94rem;
  line-height: 1.8;
  margin-bottom: 2rem;
}

/* ===== 搜索框 ===== */
.page-faq .faq-search {
  position: relative;
  max-width: 560px;
}

.page-faq .faq-search__icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--silver);
  pointer-events: none;
}

.page-faq .faq-search__input {
  width: 100%;
  background: var(--navy-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1rem 0.85rem 2.8rem;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.page-faq .faq-search__input::placeholder {
  color: var(--silver);
  opacity: 0.7;
}

.page-faq .faq-search__input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0, 179, 255, 0.15);
}

/* ===== 顶部运动轨迹装饰图 ===== */
.page-faq .faq-track {
  position: relative;
  height: clamp(120px, 28vw, 288px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-track__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  display: block;
  filter: saturate(0.8) contrast(1.05);
}

.page-faq .faq-track__overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, var(--navy-deep) 0%, rgba(7,20,38,0.2) 35%, rgba(7,20,38,0.2) 65%, var(--navy-deep) 100%);
}

.page-faq .faq-track__overlay::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--grad-accent);
  opacity: 0.8;
}

/* ===== 主体两栏布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-top: 2.25rem;
}

.page-faq .faq-side__sticky {
  display: grid;
  gap: 1.5rem;
}

.page-faq .faq-side__label {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.7rem;
}

/* ===== 左侧分类导航 ===== */
.page-faq .faq-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: thin;
}

.page-faq .faq-nav__item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--cloud);
  text-decoration: none;
  background: rgba(255,255,255,0.02);
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.page-faq .faq-nav__item:hover,
.page-faq .faq-nav__item:focus-visible {
  border-color: rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.04);
}

.page-faq .faq-nav__item.is-active {
  border-color: rgba(255, 107, 0, 0.45);
  background: rgba(255, 107, 0, 0.08);
}

.page-faq .faq-nav__num {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  color: var(--blue);
  line-height: 1;
}

.page-faq .faq-nav__name {
  font-size: 0.88rem;
  white-space: nowrap;
}

.page-faq .faq-nav__arrow {
  color: var(--orange);
  font-size: 0.85rem;
  opacity: 0;
  transform: translateX(-3px);
  transition: opacity 0.2s, transform 0.2s;
}

.page-faq .faq-nav__item:hover .faq-nav__arrow,
.page-faq .faq-nav__item.is-active .faq-nav__arrow {
  opacity: 1;
  transform: none;
}

/* ===== 侧栏卡片 ===== */
.page-faq .faq-aside-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255,107,0,0.12), rgba(0,179,255,0.06));
}

.page-faq .faq-aside-card__title {
  font-family: var(--font-heading);
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.page-faq .faq-aside-card__text {
  color: var(--silver);
  font-size: 0.82rem;
  line-height: 1.55;
  margin: 0 0 0.8rem;
}

.page-faq .faq-side__image {
  display: none;
}

/* ===== 问题列表 ===== */
.page-faq .faq-list {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
}

.page-faq .faq-group {
  scroll-margin-top: 7rem;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  position: relative;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.8rem;
  margin-bottom: 1.1rem;
  transition: background 0.2s, border-color 0.2s;
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 58px;
  height: 2px;
  background: var(--grad-accent);
  transition: width 0.2s;
}

.page-faq .faq-group:target .faq-group__head {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.16);
}

.page-faq .faq-group:target .faq-group__head::after {
  width: 96px;
}

.page-faq .faq-group__index {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--orange);
}

.page-faq .faq-group__meta {
  display: grid;
  gap: 0.16rem;
}

.page-faq .faq-group__title {
  font-family: var(--font-heading);
  font-size: 1.28rem;
  color: var(--white);
  letter-spacing: 0.02em;
  margin: 0;
}

.page-faq .faq-group__note {
  margin: 0;
  color: var(--silver);
  font-size: 0.78rem;
}

.page-faq .faq-group__items {
  display: grid;
  gap: 0.65rem;
}

/* ===== 手风琴条目 ===== */
.page-faq .faq-item {
  background: var(--faq-card-bg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  transition: border-color 0.2s, background 0.2s;
}

.page-faq .faq-item:hover {
  border-color: rgba(255,255,255,0.16);
}

.page-faq .faq-item[open] {
  background: var(--faq-card-strong);
  border-left-color: var(--orange);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
  -webkit-user-select: none;
  transition: padding 0.2s;
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
  border-radius: var(--radius);
}

.page-faq .faq-item[open] .faq-item__summary {
  padding-bottom: 0.6rem;
}

.page-faq .faq-item__mark {
  width: 1.5rem;
  height: 1.5rem;
  flex: 0 0 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  color: var(--orange);
  background: rgba(255,107,0,0.09);
  border: 1px solid rgba(255,107,0,0.2);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 0 100%);
}

.page-faq .faq-item__question {
  flex: 1 1 auto;
  color: var(--white);
  font-weight: 600;
  font-size: 0.93rem;
  line-height: 1.5;
}

.page-faq .faq-item__toggle {
  position: relative;
  width: 0.75rem;
  height: 0.75rem;
  flex: 0 0 0.75rem;
}

.page-faq .faq-item__toggle::before,
.page-faq .faq-item__toggle::after {
  content: "";
  position: absolute;
  background: var(--blue);
  transition: transform 0.2s, opacity 0.2s, background 0.2s;
}

.page-faq .faq-item__toggle::before {
  width: 0.75rem;
  height: 2px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.page-faq .faq-item__toggle::after {
  width: 2px;
  height: 0.75rem;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}

.page-faq .faq-item[open] .faq-item__toggle::before {
  background: var(--orange);
  transform: translateY(-50%) rotate(180deg);
}

.page-faq .faq-item[open] .faq-item__toggle::after {
  opacity: 0;
  transform: translateX(-50%) rotate(90deg);
}

/* ===== 答案内容 ===== */
.page-faq .faq-item__answer {
  padding: 0 1rem 1.1rem 2.25rem;
}

.page-faq .faq-item[open] .faq-item__answer {
  animation: faq-panel-in 0.2s ease-out;
}

.page-faq .faq-item__answer p {
  margin: 0.8rem 0 0;
  color: var(--cloud);
  font-size: 0.86rem;
  line-height: 1.8;
}

.page-faq .faq-item__answer p:first-child {
  margin-top: 0;
}

.page-faq .faq-item__link {
  display: inline-block;
  color: var(--blue);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(0, 179, 255, 0.35);
  transition: color 0.2s, border-color 0.2s;
}

.page-faq .faq-item__link:hover,
.page-faq .faq-item__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

@keyframes faq-panel-in {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__answer {
    animation: none;
  }
  .page-faq .faq-nav__item,
  .page-faq .faq-item,
  .page-faq .faq-item__toggle::before,
  .page-faq .faq-item__toggle::after {
    transition: none;
  }
}

/* ===== 桌面断点 ===== */
@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 290px minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 3.5rem;
    align-items: start;
  }

  .page-faq .faq-side {
    align-self: start;
  }

  .page-faq .faq-side__sticky {
    position: sticky;
    top: 2rem;
  }

  .page-faq .faq-nav {
    display: grid;
    gap: 0.35rem;
    overflow: visible;
  }

  .page-faq .faq-nav__item {
    padding: 0.75rem 0.85rem;
    border-color: transparent;
    background: transparent;
  }

  .page-faq .faq-nav__item:hover,
  .page-faq .faq-nav__item:focus-visible {
    border-color: var(--line);
    background: rgba(255,255,255,0.03);
  }

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

  .page-faq .faq-side__image .img-frame {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
  }

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