/* ===== 页面专属样式：.page-faq ===== */
.page-faq {
  --faq-border-glow: 0 0 8px rgba(0, 245, 212, 0.25);
  --faq-card-radius: 4px;
  --faq-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --faq-icon-size: 40px;
  --faq-category-width: 180px;
  --faq-gap: 32px;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  padding: 0 0 48px 0;
  min-height: 100vh;
}

/* ---- 面包屑 ---- */
.faq-breadcrumb {
  padding: 16px 24px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
}
.faq-breadcrumb-link {
  color: var(--primary-cyan);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.faq-breadcrumb-link:hover {
  color: var(--hover-glow);
}
.faq-breadcrumb-sep {
  color: var(--text-secondary);
  opacity: 0.5;
}
.faq-breadcrumb-current {
  color: var(--text-primary);
  font-weight: 600;
}

/* ---- 英雄区 ---- */
.faq-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 24px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}
.faq-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.12;
  pointer-events: none;
}
.faq-hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.faq-hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 720px;
}
.faq-hero-title {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 2.8rem;
  line-height: 1.1;
  color: var(--text-on-dark);
  text-shadow: 0 0 12px rgba(0, 245, 212, 0.5), 0 0 30px rgba(0, 245, 212, 0.2);
  margin: 0 0 8px;
}
.faq-hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin: 0 0 28px;
  letter-spacing: 0.02em;
}
.faq-search-wrapper {
  position: relative;
  max-width: 500px;
  margin: 0 auto 24px;
}
.faq-search-input {
  width: 100%;
  padding: 14px 20px 14px 44px;
  background: var(--card-bg);
  border: var(--border-neon);
  border-radius: var(--faq-card-radius);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  box-sizing: border-box;
}
.faq-search-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}
.faq-search-input:focus {
  border-color: var(--primary-magenta);
  box-shadow: 0 0 0 2px rgba(255, 0, 110, 0.2), var(--faq-border-glow);
}
.faq-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--text-secondary);
  pointer-events: none;
}
.faq-hot-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  align-items: center;
}
.faq-hot-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.faq-hot-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0, 245, 212, 0.08);
  border: 1px solid rgba(0, 245, 212, 0.25);
  border-radius: 2px;
  color: var(--primary-cyan);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: background var(--faq-transition), border-color var(--faq-transition), color var(--faq-transition);
}
.faq-hot-tag:hover {
  background: rgba(255, 0, 110, 0.15);
  border-color: var(--primary-magenta);
  color: var(--primary-magenta);
}

/* ---- 主布局 ---- */
.faq-layout {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 分类导航（侧边） ---- */
.faq-categories {
  flex: 0 0 auto;
  width: 100%;
}
.faq-categories-title {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(0, 245, 212, 0.15);
}
.faq-categories-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.faq-category-link {
  display: block;
  padding: 8px 18px;
  background: transparent;
  border: 1px solid rgba(0, 245, 212, 0.2);
  border-radius: var(--faq-card-radius);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background var(--faq-transition), border-color var(--faq-transition), color var(--faq-transition);
  white-space: nowrap;
}
.faq-category-link:hover {
  background: rgba(255, 0, 110, 0.1);
  border-color: var(--primary-magenta);
  color: var(--primary-magenta);
}
.faq-category-link:focus-visible {
  outline: 2px solid var(--primary-cyan);
  outline-offset: 2px;
}

/* ---- 问答区 ---- */
.faq-questions {
  flex: 1;
  min-width: 0;
}
.faq-section {
  margin-bottom: 40px;
  scroll-margin-top: 24px;
}
.faq-section-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-on-dark);
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid;
  border-image: var(--accent-gradient) 1;
}
.faq-section-icon {
  width: var(--faq-icon-size);
  height: var(--faq-icon-size);
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 2px;
}

/* ---- 折叠面板 ---- */
.faq-item {
  background: var(--card-bg);
  border: var(--border-neon);
  border-radius: var(--faq-card-radius);
  margin-bottom: 10px;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  overflow: hidden;
}
.faq-item[open] {
  border-color: rgba(0, 245, 212, 0.5);
  box-shadow: var(--faq-border-glow);
}
.faq-item-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--faq-transition);
}
.faq-item-summary::-webkit-details-marker {
  display: none;
}
.faq-item-summary:hover {
  background: rgba(0, 245, 212, 0.04);
}
.faq-item-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  flex: 1;
  line-height: 1.4;
}
.faq-item-arrow {
  font-size: 0.9rem;
  color: var(--primary-cyan);
  transition: transform var(--faq-transition);
  flex-shrink: 0;
}
.faq-item[open] .faq-item-arrow {
  transform: rotate(180deg);
}
.faq-item-content {
  padding: 0 18px 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(0, 245, 212, 0.08);
  padding-top: 14px;
  animation: faq-fade-in 0.3s ease-out;
}
@keyframes faq-fade-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
.faq-item-content p {
  margin: 0 0 8px;
}
.faq-item-content p:last-child {
  margin-bottom: 0;
}
.faq-item-content strong {
  color: var(--primary-cyan);
  font-weight: 600;
}

/* ---- 内联代码 & 链接徽章 ---- */
.faq-inline-code {
  font-family: var(--font-code);
  font-size: 0.9em;
  background: rgba(0, 245, 212, 0.08);
  padding: 2px 8px;
  border-radius: 2px;
  color: var(--primary-cyan);
  border: 1px solid rgba(0, 245, 212, 0.15);
}
.faq-link-badge {
  display: inline-block;
  padding: 2px 12px;
  background: rgba(255, 0, 110, 0.1);
  border: 1px solid rgba(255, 0, 110, 0.25);
  border-radius: 2px;
  color: var(--primary-magenta);
  text-decoration: none;
  font-size: 0.85em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: background var(--faq-transition), border-color var(--faq-transition), color var(--faq-transition);
}
.faq-link-badge:hover {
  background: rgba(255, 0, 110, 0.2);
  border-color: var(--primary-magenta);
  color: #fff;
}
.faq-link-badge-lg {
  padding: 4px 18px;
  font-size: 0.95em;
}

/* ---- 联系区块 ---- */
.faq-contact-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  padding: 32px 24px;
  background: var(--card-bg);
  border: 1px solid rgba(0, 245, 212, 0.12);
  border-radius: var(--faq-card-radius);
  text-align: center;
}
.faq-contact-icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  opacity: 0.7;
}
.faq-contact-text {
  font-size: 1.05rem;
  color: var(--text-primary);
  margin: 0;
  max-width: 440px;
}

/* ===== 桌面端 >= 768px ===== */
@media (min-width: 768px) {
  .page-faq {
    padding: 0 0 64px;
  }
  .faq-breadcrumb {
    padding: 20px 32px 0;
  }
  .faq-hero {
    padding: 56px 32px 56px;
  }
  .faq-hero-title {
    font-size: 3.6rem;
  }
  .faq-hero-sub {
    font-size: 1.3rem;
  }
  .faq-search-input {
    padding: 16px 24px 16px 48px;
    font-size: 1.05rem;
  }
  .faq-layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 0 32px;
    gap: 40px;
  }
  .faq-categories {
    width: var(--faq-category-width);
    position: sticky;
    top: 24px;
    flex-shrink: 0;
  }
  .faq-categories-list {
    flex-direction: column;
    gap: 6px;
  }
  .faq-category-link {
    white-space: normal;
    padding: 10px 16px;
    font-size: 0.9rem;
  }
  .faq-section-title {
    font-size: 1.5rem;
  }
  .faq-item-summary {
    padding: 16px 22px;
  }
  .faq-item-title {
    font-size: 1.05rem;
  }
  .faq-item-content {
    padding: 0 22px 18px;
    padding-top: 16px;
  }
  .faq-contact-block {
    flex-direction: row;
    justify-content: center;
    padding: 28px 32px;
    gap: 24px;
  }
  .faq-contact-text {
    text-align: left;
  }
}

/* ===== 大桌面端 >= 1024px ===== */
@media (min-width: 1024px) {
  .faq-hero {
    padding: 72px 32px 64px;
  }
  .faq-hero-title {
    font-size: 4.2rem;
  }
  .faq-layout {
    gap: 56px;
  }
  .faq-categories {
    width: 200px;
  }
  .faq-section {
    margin-bottom: 48px;
  }
}

/* ===== 超大屏幕 >= 1400px ===== */
@media (min-width: 1400px) {
  .faq-layout {
    max-width: 1320px;
  }
  .faq-categories {
    width: 220px;
  }
}