/* ===== 帮助中心页面专属样式 ===== */
.page-faq {
  --faq-accent: var(--clr-primary);
  --faq-warm: var(--clr-accent);
  --faq-cyan: var(--clr-cyan);
  --faq-nav-width: 252px;
  --faq-card-radius: 18px;
  --faq-border: var(--clr-border);
  --faq-card-bg: var(--clr-panel);
  --faq-text: var(--clr-text);
  --faq-muted: var(--clr-muted);
  --faq-gap: clamp(2rem, 4vw, 4rem);
  color: var(--faq-text);
  background: var(--clr-bg);
}

/* ---------- 首屏 ---------- */
.page-faq__hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-offset) + clamp(1.25rem, 3vw, 2.5rem)) 0 clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--clr-border);
  background:
    linear-gradient(120deg, rgba(198, 255, 0, 0.06) 0%, transparent 38%),
    linear-gradient(300deg, rgba(255, 107, 0, 0.05) 0%, transparent 42%),
    var(--clr-bg);
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 4%;
  width: 34%;
  height: 100%;
  background: repeating-linear-gradient(120deg, transparent 0 12px, rgba(198, 255, 0, 0.025) 12px 13px);
  pointer-events: none;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 42%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-primary), transparent);
  opacity: 0.6;
}

.page-faq__hero-inner {
  position: relative;
  display: grid;
  gap: 1.25rem;
}

.page-faq__hero .breadcrumb {
  margin-bottom: 0.25rem;
}

.page-faq__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin: 0;
  max-width: 18ch;
}

.page-faq__hero-lead {
  margin: 0;
  max-width: 52ch;
  color: var(--faq-muted);
  font-size: 1.06rem;
  line-height: 1.7;
}

.page-faq__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.page-faq__hero-stats .stat {
  min-width: 104px;
  padding: 0.9rem 1.1rem;
  background: rgba(17, 21, 26, 0.72);
  border: 1px solid var(--clr-border);
  border-radius: 14px;
}

.page-faq__hero-stats .stat__value {
  font-family: var(--font-numeric);
  font-size: 1.55rem;
  color: var(--clr-primary);
  line-height: 1.1;
}

.page-faq__hero-stats .stat__label {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.8rem;
  color: var(--faq-muted);
}

/* ---------- 分栏布局 ---------- */
.page-faq__layout {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
  padding-top: clamp(2rem, 4vw, 3.25rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 左侧问题目录（移动端横向标签） ---------- */
.page-faq__nav {
  position: sticky;
  top: calc(var(--header-offset) + 1rem);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border: 1px solid var(--faq-border);
  border-radius: var(--radius-pill);
  background: rgba(17, 21, 26, 0.9);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

.page-faq__nav-label {
  flex: 0 0 auto;
  margin: 0;
  padding: 0 0.25rem 0 0.75rem;
  font-family: var(--font-numeric);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faq-muted);
}

.page-faq__nav ol {
  display: flex;
  gap: 0.3rem;
  flex: 1 0 auto;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__nav a {
  display: block;
  padding: 0.45rem 0.95rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--faq-text);
  transition:
    background 0.2s var(--ease-out),
    color 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out);
}

.page-faq__nav a:hover,
.page-faq__nav a:focus-visible {
  background: var(--clr-primary);
  color: var(--clr-bg);
  border-color: var(--clr-primary);
}

.page-faq__nav-cta {
  display: none;
}

/* ---------- 右侧问答区 ---------- */
.page-faq__content {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
}

.page-faq__section {
  display: grid;
  gap: 1rem;
  scroll-margin-top: calc(var(--header-offset) + 0.75rem);
}

.page-faq__section-header {
  position: sticky;
  top: calc(var(--header-offset) - 0.5rem);
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 0;
  background: linear-gradient(180deg, var(--clr-bg) 68%, transparent 100%);
}

.page-faq__section-index {
  font-family: var(--font-numeric);
  font-size: 0.85rem;
  color: var(--clr-accent);
  border: 1px solid rgba(255, 107, 0, 0.4);
  border-radius: 6px;
  padding: 0.2rem 0.45rem;
  line-height: 1;
  flex: 0 0 auto;
}

.page-faq__section-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--faq-text);
}

.page-faq__section-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--clr-border), transparent);
}

/* ---------- 手风琴 ---------- */
.page-faq__qa-list {
  display: grid;
  gap: 0.75rem;
}

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

.page-faq__qa summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.15rem 1.25rem;
  list-style: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--faq-text);
  user-select: none;
}

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

.page-faq__qa summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-numeric);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--clr-primary);
  transition: transform 0.25s var(--ease-out);
}

.page-faq__qa[open] summary::after {
  content: "−";
}

.page-faq__qa[open] {
  border-color: rgba(198, 255, 0, 0.6);
  box-shadow:
    0 0 0 1px rgba(198, 255, 0, 0.18),
    0 16px 40px rgba(0, 0, 0, 0.35);
}

.page-faq__qa[open] > .page-faq__answer {
  animation: page-faq-fade 0.3s var(--ease-out);
}

@keyframes page-faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 问题图标：抽象几何形状 ---------- */
.page-faq__icon {
  display: inline-block;
  flex: 0 0 auto;
}

.page-faq__icon--circle {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clr-primary);
  box-shadow: 0 0 8px rgba(198, 255, 0, 0.7);
}

.page-faq__icon--triangle {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 10px solid var(--clr-accent);
}

.page-faq__icon--diamond {
  width: 9px;
  height: 9px;
  background: var(--clr-cyan);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-faq__icon--square {
  width: 9px;
  height: 9px;
  border: 2px solid var(--clr-primary);
  border-radius: 2px;
}

/* ---------- 问答正文 ---------- */
.page-faq__answer {
  padding: 0 1.25rem 1.05rem 2.8rem;
  color: var(--faq-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-faq__answer p {
  margin: 0;
}

.page-faq__answer a {
  color: var(--clr-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq__answer a:hover {
  color: var(--faq-warm);
}

/* ---------- 图示 ---------- */
.page-faq__figure {
  margin: 0.5rem 0 0;
  padding: 0.65rem;
  border: 1px solid var(--faq-border);
  border-radius: var(--radius-md);
  background: rgba(17, 21, 26, 0.45);
}

.page-faq__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
}

.page-faq__figure--square img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq__figure--wide img {
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-faq__figure figcaption {
  padding: 0.75rem 0.25rem 0.25rem;
  font-family: var(--font-numeric);
  font-size: 0.8rem;
  color: var(--faq-muted);
}

/* ---------- 底部联系区 ---------- */
.page-faq__contact {
  position: relative;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
  margin-top: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--faq-border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(198, 255, 0, 0.08), transparent 55%),
    var(--faq-card-bg);
}

.page-faq__contact h2 {
  margin: 0.25rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  text-transform: uppercase;
  color: var(--faq-text);
}

.page-faq__contact p {
  margin: 0.75rem 0 0;
  color: var(--faq-muted);
  line-height: 1.7;
}

.page-faq__contact .btn {
  justify-self: start;
  margin-top: 0.25rem;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-faq__contact {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-faq__contact .btn {
    justify-self: end;
    margin-top: 0;
  }
}

@media (min-width: 960px) {
  .page-faq__layout {
    grid-template-columns: var(--faq-nav-width) minmax(0, 1fr);
  }

  .page-faq__nav {
    position: sticky;
    top: calc(var(--header-offset) + 1rem);
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    overflow: visible;
  }

  .page-faq__nav-label {
    padding: 0 0.25rem;
  }

  .page-faq__nav ol {
    flex-direction: column;
    gap: 0.25rem;
  }

  .page-faq__nav a {
    border-radius: 10px;
    padding: 0.55rem 0.8rem;
    font-size: 0.94rem;
    white-space: normal;
  }

  .page-faq__nav-cta {
    display: block;
    margin-top: 0.4rem;
    padding: 0.65rem 0.8rem;
    border-top: 1px solid var(--faq-border);
    font-size: 0.9rem;
    color: var(--clr-primary);
    text-decoration: none;
  }

  .page-faq__nav-cta:hover {
    color: var(--clr-bg);
    background: var(--clr-primary);
  }

  .page-faq__section-header {
    top: calc(var(--header-offset) + 0.5rem);
  }
}