.page-faq {
  --faq-group-gap: 3rem;
  --faq-item-radius: 0;
  --faq-border-color: rgba(255, 255, 255, 0.08);
  --faq-bg-hover: rgba(0, 212, 255, 0.04);
  display: block;
  width: 100%;
  background-color: var(--bg-dark, #0D1117);
  color: var(--text-primary, #FFFFFF);
  font-family: var(--font-sans, 'Inter', sans-serif);
  margin: 0;
  padding: calc(var(--header-height, 64px) + 1rem) 0 0 0;
  min-height: 80vh;
}

/* ===== hero ===== */
.page-faq__hero {
  padding: 2rem 0 1.5rem 0;
  border-bottom: 1px solid var(--faq-border-color);
}

.page-faq__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary, #B0B8C4);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.page-faq__breadcrumb-link {
  color: var(--primary, #00D4FF);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
}
.page-faq__breadcrumb-link:hover,
.page-faq__breadcrumb-link:focus-visible {
  color: var(--secondary, #FF2D55);
  outline: none;
}
.page-faq__breadcrumb-sep {
  user-select: none;
  opacity: 0.4;
}
.page-faq__breadcrumb-current {
  color: var(--text-secondary, #B0B8C4);
  font-weight: 500;
}

.page-faq__hero-content {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
}

.page-faq__hero-text {
  flex: 1 1 280px;
}

.page-faq__hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.15;
  margin: 0 0 0.5rem 0;
  background: linear-gradient(135deg, var(--primary, #00D4FF) 0%, var(--accent-purple, #7B2FFF) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-faq__hero-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary, #B0B8C4);
  line-height: 1.6;
  margin: 0;
  max-width: 480px;
}

.page-faq__hero-visual {
  flex: 0 0 auto;
}
.page-faq__hero-svg {
  display: block;
  width: 180px;
  height: auto;
}

/* ===== intro ===== */
.page-faq__intro {
  padding: 1.5rem 0 0.5rem 0;
}
.page-faq__intro-text {
  font-size: 1rem;
  color: var(--text-secondary, #B0B8C4);
  line-height: 1.7;
  margin: 0;
  max-width: 640px;
}
.page-faq__inline-link {
  color: var(--primary, #00D4FF);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color var(--transition, 0.3s ease);
}
.page-faq__inline-link:hover,
.page-faq__inline-link:focus-visible {
  color: var(--secondary, #FF2D55);
  outline: none;
}

/* ===== list groups ===== */
.page-faq__list {
  padding: 2.5rem 0 1rem 0;
  display: flex;
  flex-direction: column;
  gap: var(--faq-group-gap);
}

.page-faq__group {
  border: none;
  padding: 0;
  margin: 0;
}

.page-faq__group-title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary, #FFFFFF);
  margin: 0 0 1.25rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary, #00D4FF);
  display: inline-block;
}

.page-faq__items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ===== accordion item ===== */
.page-faq__item {
  border: 1px solid var(--faq-border-color);
  border-radius: var(--faq-item-radius);
  background-color: transparent;
  transition: background-color var(--transition, 0.3s ease), border-color var(--transition, 0.3s ease);
  list-style: none;
  margin: 0;
}
.page-faq__item:hover {
  background-color: var(--faq-bg-hover);
  border-color: rgba(255, 255, 255, 0.12);
}
.page-faq__item[open] {
  border-color: rgba(0, 212, 255, 0.2);
  background-color: rgba(0, 212, 255, 0.03);
}

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

.page-faq__question {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary, #FFFFFF);
  list-style: none;
  transition: color var(--transition, 0.3s ease);
}
.page-faq__question::-webkit-details-marker {
  display: none;
}
.page-faq__question::marker {
  display: none;
  content: "";
}
.page-faq__question:hover {
  color: var(--primary, #00D4FF);
}
.page-faq__item[open] .page-faq__question {
  color: var(--primary, #00D4FF);
}

.page-faq__q-icon {
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  color: var(--primary, #00D4FF);
  opacity: 0.8;
  transition: transform var(--transition, 0.3s ease);
}
.page-faq__item[open] .page-faq__q-icon {
  opacity: 1;
  transform: scale(1.05);
}

.page-faq__q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq__arrow {
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  color: var(--text-secondary, #B0B8C4);
  transition: transform var(--transition, 0.3s ease), color var(--transition, 0.3s ease);
}
.page-faq__item[open] .page-faq__arrow {
  transform: rotate(180deg);
  color: var(--primary, #00D4FF);
}

.page-faq__answer {
  border-top: 1px solid transparent;
  transition: border-color var(--transition, 0.3s ease);
}
.page-faq__item[open] .page-faq__answer {
  border-top-color: var(--faq-border-color);
}

.page-faq__answer-inner {
  padding: 0 1.25rem 1.25rem 3.25rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary, #B0B8C4);
}
.page-faq__answer-inner p {
  margin: 0 0 0.75rem 0;
}
.page-faq__answer-inner p:last-child {
  margin-bottom: 0;
}

.page-faq__answer-img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1rem 0 0 0;
  border: 1px solid var(--faq-border-color);
  border-radius: 0;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

/* ===== cta ===== */
.page-faq__cta {
  padding: 3rem 0 4rem 0;
  border-top: 1px solid var(--faq-border-color);
  text-align: center;
}
.page-faq__cta-text {
  font-size: 1.125rem;
  color: var(--text-secondary, #B0B8C4);
  margin: 0 0 1.25rem 0;
}
.page-faq__cta-btn {
  display: inline-block;
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--bg-dark, #0D1117);
  background-color: var(--primary, #00D4FF);
  text-decoration: none;
  transition: background-color var(--transition, 0.3s ease), transform 0.15s ease;
  border: none;
  border-radius: 0;
}
.page-faq__cta-btn:hover,
.page-faq__cta-btn:focus-visible {
  background-color: var(--secondary, #FF2D55);
  color: #FFFFFF;
  transform: translateY(-2px);
  outline: none;
}

/* ===== 移动端优先 + 响应式 ===== */
.page-faq .container {
  width: 100%;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (max-width: 639px) {
  .page-faq {
    padding-top: calc(var(--header-height, 64px) + 0.5rem);
  }
  .page-faq__hero {
    padding: 1.25rem 0 1rem 0;
  }
  .page-faq__hero-title {
    font-size: 1.625rem;
  }
  .page-faq__hero-desc {
    font-size: 0.9375rem;
  }
  .page-faq__hero-visual {
    display: none;
  }
  .page-faq__group-title {
    font-size: 1.125rem;
  }
  .page-faq__question {
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    gap: 0.5rem;
  }
  .page-faq__answer-inner {
    padding: 0 1rem 1rem 2.75rem;
    font-size: 0.875rem;
  }
  .page-faq__cta {
    padding: 2rem 0 2.5rem 0;
  }
  .page-faq__cta-text {
    font-size: 1rem;
  }
  .page-faq__cta-btn {
    padding: 0.625rem 2rem;
    font-size: 0.9375rem;
  }
  .page-faq .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .page-faq__hero-title {
    font-size: 2rem;
  }
  .page-faq__hero-visual {
    display: block;
  }
  .page-faq__hero-svg {
    width: 150px;
  }
  .page-faq__group-title {
    font-size: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .page-faq__hero {
    padding: 3rem 0 2rem 0;
  }
  .page-faq__hero-title {
    font-size: 2.75rem;
  }
  .page-faq__hero-svg {
    width: 200px;
  }
  .page-faq__list {
    padding: 3rem 0 1.5rem 0;
    gap: 4rem;
  }
  .page-faq__group-title {
    font-size: 1.5rem;
  }
  .page-faq__question {
    padding: 1.125rem 1.5rem;
    font-size: 1.0625rem;
  }
  .page-faq__answer-inner {
    padding: 0 1.5rem 1.5rem 3.75rem;
  }
  .page-faq__cta {
    padding: 4rem 0 5rem 0;
  }
  .page-faq__cta-btn {
    padding: 0.875rem 3rem;
  }
}

@media (min-width: 1280px) {
  .page-faq .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

/* ===== 滚动 & 焦点 ===== */
@media (prefers-reduced-motion: no-preference) {
  .page-faq__arrow {
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), color var(--transition, 0.3s ease);
  }
  .page-faq__question {
    transition: color var(--transition, 0.3s ease);
  }
  .page-faq__cta-btn {
    transition: background-color var(--transition, 0.3s ease), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  }
}

.page-faq__question:focus-visible {
  outline: 2px solid var(--primary, #00D4FF);
  outline-offset: -2px;
}

.page-faq__cta-btn:focus-visible {
  outline: 2px solid #FFFFFF;
  outline-offset: 3px;
}