.page-faq {
  --faq-accent: var(--c-accent);
  --faq-purple: var(--c-accent-2);
  --faq-bg: var(--c-bg-2);
  --faq-line: var(--c-line);
  --faq-text: var(--c-text);
  --faq-dim: var(--c-text-dim);
  --faq-glow: rgba(100, 255, 218, 0.08);
  --faq-purple-glow: rgba(157, 78, 221, 0.12);

  position: relative;
  background-image:
    radial-gradient(circle at 80% 5%, var(--faq-purple-glow), transparent 420px),
    radial-gradient(circle at 10% 35%, rgba(0, 212, 255, 0.05), transparent 360px);
}

/* ========== Hero ========== */

.faq-hero {
  position: relative;
  padding: 2rem 0 0;
  border-bottom: 1px solid var(--faq-line);
  background:
    linear-gradient(rgba(100, 255, 218, 0.02), rgba(100, 255, 218, 0.02)),
    linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg-3) 100%);
  overflow: hidden;
}

.faq-hero__grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.faq-hero__content {
  max-width: 720px;
}

.faq-hero .breadcrumb {
  margin-bottom: 1rem;
}

.faq-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(1.7rem, 4.8vw, 2.75rem);
  line-height: 1.08;
  margin: 0.5rem 0 1rem;
  color: var(--faq-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  text-wrap: balance;
}

.faq-hero__lead {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--faq-dim);
}

.faq-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  position: relative;
}

.faq-stat {
  position: relative;
  padding: 1rem 1rem 1.1rem;
  background: rgba(17, 34, 64, 0.72);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.35s var(--ease);
}

.faq-stat::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-2));
  opacity: 0.65;
}

.faq-stat:hover {
  border-color: rgba(100, 255, 218, 0.35);
}

.faq-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  line-height: 1.15;
  color: var(--c-accent-3);
  letter-spacing: -0.02em;
}

.faq-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--faq-dim);
}

.faq-hero__strip {
  position: relative;
  margin-top: 2rem;
  height: 120px;
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
  overflow: hidden;
}

.faq-hero__strip img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.32;
}

/* ========== 主体布局 ========== */

.faq-layout {
  display: block;
  padding: 2rem 0 4rem;
}

/* ========== 左侧目录 ========== */

.faq-index {
  margin-bottom: 2rem;
}

.faq-index__sticky {
  background: rgba(17, 34, 64, 0.7);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.25rem 1.1rem;
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow);
}

.faq-index__title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--c-accent);
}

.faq-index__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--faq-dim);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  color: var(--c-accent);
  border-color: var(--faq-line);
  background: rgba(100, 255, 218, 0.05);
  outline: none;
}

.faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-accent-2);
}

.faq-index__support {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--faq-line);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-items: flex-start;
}

.faq-index__support-text {
  margin: 0 0 0.2rem;
  color: var(--faq-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

.faq-index__hotline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--c-accent-3);
}

.faq-index__note {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--faq-dim);
}

.faq-index__privacy {
  margin-top: 0.6rem;
  color: var(--faq-dim);
  font-size: 0.85rem;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--faq-line);
  transition: color 0.3s var(--ease);
}

.faq-index__privacy:hover {
  color: var(--c-accent);
}

/* ========== 右侧问答 ========== */

.faq-content {
  min-width: 0;
}

.faq-group {
  margin-bottom: 3rem;
  scroll-margin-top: calc(var(--header-h) + 1.2rem);
}

.faq-group__title {
  margin: 0 0 1.4rem;
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--faq-text);
  border-left: 3px solid var(--c-accent);
  padding-left: 0.9rem;
}

.faq-group__title::after {
  content: attr(data-count);
  display: inline-block;
  margin-left: 0.6rem;
  padding: 0.1rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--faq-purple);
  background: rgba(157, 78, 221, 0.12);
  border-radius: var(--radius-pill);
  vertical-align: 0.18em;
}

/* ========== 手风琴项 ========== */

.faq-item {
  margin-bottom: 0.9rem;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: rgba(17, 34, 64, 0.5);
  overflow: hidden;
  transition: border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.faq-item[open] {
  border-color: var(--c-accent);
  box-shadow: 0 0 32px var(--faq-glow);
}

.faq-item summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 1.1rem 1.15rem;
  cursor: pointer;
  list-style: none;
  color: var(--faq-text);
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.5;
  -webkit-user-select: none;
  user-select: none;
  transition: background 0.3s var(--ease);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary:hover {
  background: rgba(100, 255, 218, 0.03);
}

.faq-item summary:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: -2px;
}

.faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  color: var(--c-accent);
  transition: transform 0.35s var(--ease);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--faq-purple);
}

.faq-item__body {
  padding: 0 1.15rem 1.2rem 3.1rem;
  color: var(--faq-dim);
  font-size: 0.93rem;
  line-height: 1.8;
}

.faq-item__body p {
  margin: 0 0 0.75rem;
}

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

/* ========== 图 ========== */

.faq-figure {
  margin: 1.4rem 0 0;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--faq-bg);
}

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

.faq-figure figcaption {
  padding: 0.7rem 1rem;
  font-size: 0.82rem;
  color: var(--faq-dim);
  background: rgba(10, 25, 47, 0.7);
  border-top: 1px solid var(--faq-line);
}

/* ========== 桌面端 ========== */

@media (min-width: 768px) {
  .faq-hero {
    padding: 3rem 0 0;
  }

  .faq-hero__grid {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
  }

  .faq-hero__content {
    flex: 1 1 58%;
  }

  .faq-hero__stats {
    flex: 0 0 340px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .faq-hero__strip {
    height: 170px;
  }

  .faq-layout {
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 2.6rem;
    align-items: start;
    padding: 3rem 0 5rem;
  }

  .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    margin-bottom: 0;
  }

  .faq-index__nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .faq-index__link {
    justify-content: flex-start;
    padding: 0.55rem 0.8rem;
    border-radius: var(--radius-md);
  }

  .faq-group__title {
    font-size: 1.3rem;
  }

  .faq-item__body {
    padding-right: 2.5rem;
  }
}

@media (min-width: 1200px) {
  .faq-layout {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 3.5rem;
  }

  .faq-stat {
    padding: 1.2rem;
  }

  .faq-stat__num {
    font-size: 2rem;
  }

  .faq-stat__label {
    font-size: 0.82rem;
  }
}