/* ===== 帮助中心 FAQ 页面专属样式 ===== */
.page-faq {
  --faq-hero-min-height: 280px;
  --faq-sidebar-width: 240px;
  --faq-accordion-radius: 16px;
  --faq-question-pad: 18px 56px 18px 22px;
  --faq-transition: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  --faq-glow: 0 0 20px rgba(0, 229, 255, 0.08);
  --faq-border-accent: 1px solid rgba(0, 229, 255, 0.25);

  display: block;
  width: 100%;
  background: var(--color-bg, #0B0D17);
  color: var(--color-text-primary, #F0F4F8);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 面包屑 ===== */
.faq-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  color: var(--color-text-secondary, #9AA3B5);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.faq-breadcrumb a {
  color: var(--color-accent, #00E5FF);
  text-decoration: none;
  transition: color var(--transition-speed, 0.2s);
  font-weight: 500;
}

.faq-breadcrumb a:hover,
.faq-breadcrumb a:focus-visible {
  color: #fff;
  text-decoration: underline;
}

.faq-breadcrumb-sep {
  color: var(--color-text-muted, #8C9CAB);
  font-weight: 300;
}

.faq-breadcrumb span[aria-current="page"] {
  color: var(--color-text-primary, #F0F4F8);
  font-weight: 500;
}

/* ===== 英雄区域 ===== */
.faq-hero {
  position: relative;
  min-height: var(--faq-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(165deg, #0B0D17 0%, #0F1729 60%, #0A1628 100%);
  border-bottom: 1px solid var(--color-border, #2D354A);
}

.faq-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.35;
  mix-blend-mode: luminosity;
}

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

.faq-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at 30% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 70%),
              linear-gradient(135deg, rgba(0, 229, 255, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.faq-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1120px;
  padding: 48px 24px 40px;
  text-align: center;
}

.faq-title {
  font-family: var(--font-heading, 'Exo 2', 'Orbitron', sans-serif);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
  color: var(--color-text-primary, #F0F4F8);
  text-transform: uppercase;
  background: linear-gradient(135deg, #F0F4F8 40%, #00E5FF 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.faq-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary, #9AA3B5);
  margin: 0 0 28px;
  font-weight: 400;
  letter-spacing: 0.01em;
}

/* ===== 搜索框 ===== */
.faq-search {
  position: relative;
  max-width: 540px;
  margin: 0 auto;
}

.faq-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 1;
}

.faq-search-input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  background: var(--color-surface, #1A1F2E);
  border: 1px solid var(--color-border, #2D354A);
  border-radius: 60px;
  color: var(--color-text-primary, #F0F4F8);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: 0.95rem;
  transition: border-color var(--transition-speed, 0.2s), box-shadow var(--transition-speed, 0.2s);
  outline: none;
}

.faq-search-input::placeholder {
  color: var(--color-text-muted, #8C9CAB);
  opacity: 0.8;
}

.faq-search-input:focus {
  border-color: var(--color-accent, #00E5FF);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15), var(--faq-glow);
}

/* ===== 布局 ===== */
.faq-layout {
  display: flex;
  gap: 32px;
  max-width: 1160px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

/* ===== 侧边栏 ===== */
.faq-sidebar {
  width: var(--faq-sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: 100px;
  align-self: flex-start;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.faq-anchor-nav {
  background: var(--color-surface, #1A1F2E);
  border: 1px solid var(--color-border, #2D354A);
  border-radius: var(--faq-accordion-radius);
  padding: 20px 16px;
  margin-bottom: 20px;
}

.faq-anchor-label {
  display: block;
  font-family: var(--font-heading, 'Exo 2', 'Orbitron', sans-serif);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent, #00E5FF);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border, #2D354A);
}

.faq-anchor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.faq-anchor-link {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--color-text-secondary, #9AA3B5);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: background var(--transition-speed, 0.2s), color var(--transition-speed, 0.2s), padding-left var(--transition-speed, 0.2s);
  border-left: 3px solid transparent;
}

.faq-anchor-link:hover,
.faq-anchor-link:focus-visible {
  background: rgba(0, 229, 255, 0.07);
  color: var(--color-accent, #00E5FF);
  padding-left: 18px;
  border-left-color: var(--color-accent, #00E5FF);
}

/* 侧边栏 CTA */
.faq-sidebar-cta {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.06), rgba(10, 102, 194, 0.08));
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: var(--faq-accordion-radius);
  padding: 20px 16px;
  text-align: center;
}

.faq-sidebar-cta-text {
  margin: 0 0 12px;
  font-size: 0.88rem;
  color: var(--color-text-secondary, #9AA3B5);
  font-weight: 400;
}

.faq-sidebar-btn {
  display: inline-block;
  padding: 10px 28px;
  border-radius: 60px;
  background: var(--color-accent, #00E5FF);
  color: #0B0D17;
  font-family: var(--font-heading, 'Exo 2', 'Orbitron', sans-serif);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background var(--transition-speed, 0.2s), transform var(--transition-speed, 0.2s), box-shadow var(--transition-speed, 0.2s);
}

.faq-sidebar-btn:hover,
.faq-sidebar-btn:focus-visible {
  background: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 229, 255, 0.3);
}

/* ===== 内容区 ===== */
.faq-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* ===== 每个区块 ===== */
.faq-section {
  scroll-margin-top: 90px;
}

.faq-section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-border, #2D354A);
  position: relative;
}

.faq-section-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 64px;
  height: 2px;
  background: var(--color-accent, #00E5FF);
  border-radius: 2px;
}

.faq-section-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: 16px;
  background: var(--color-surface, #1A1F2E);
  border: 1px solid var(--color-border, #2D354A);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 8px;
}

.faq-section-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.faq-section-title {
  font-family: var(--font-heading, 'Exo 2', 'Orbitron', sans-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-primary, #F0F4F8);
  letter-spacing: 0.01em;
  margin: 0;
}

/* ===== 手风琴 ===== */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-surface, #1A1F2E);
  border: 1px solid var(--color-border, #2D354A);
  border-radius: var(--faq-accordion-radius);
  overflow: hidden;
  transition: border-color var(--transition-speed, 0.2s), box-shadow var(--transition-speed, 0.2s);
}

.faq-item[open] {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--faq-glow);
}

.faq-question {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--faq-question-pad);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-speed, 0.2s);
  gap: 12px;
  -webkit-tap-highlight-color: transparent;
}

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

.faq-question:hover {
  background: rgba(0, 229, 255, 0.03);
}

.faq-question:focus-visible {
  outline: 2px solid var(--color-accent, #00E5FF);
  outline-offset: -2px;
  border-radius: var(--faq-accordion-radius);
}

.faq-question-text {
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-text-primary, #F0F4F8);
  line-height: 1.4;
  flex: 1;
}

.faq-question-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  transition: transform var(--faq-transition);
  color: var(--color-accent, #00E5FF);
}

.faq-item[open] .faq-question-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 22px 20px;
  color: var(--color-text-secondary, #9AA3B5);
  font-size: 0.92rem;
  line-height: 1.7;
  border-top: 1px solid var(--color-border, #2D354A);
  padding-top: 16px;
  margin-top: 0;
  animation: faqFadeIn 0.3s ease-out;
}

.faq-answer a {
  color: var(--color-accent, #00E5FF);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-speed, 0.2s), color var(--transition-speed, 0.2s);
}

.faq-answer a:hover,
.faq-answer a:focus-visible {
  color: #fff;
  border-bottom-color: var(--color-accent, #00E5FF);
}

.faq-answer p {
  margin: 0 0 8px;
}

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

@keyframes faqFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 信任声明 ===== */
.faq-trust {
  margin-top: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border, #2D354A);
}

.trust-statement {
  font-size: 0.85rem;
  color: var(--color-text-muted, #8C9CAB);
  text-align: center;
  font-style: italic;
  letter-spacing: 0.02em;
  padding: 14px 20px;
  border-radius: 12px;
  background: rgba(0, 229, 255, 0.03);
  border: 1px dashed var(--color-border, #2D354A);
}

/* ===== 响应式 ===== */

/* 移动端优先：窄屏（< 768px） */
@media (max-width: 767px) {
  .faq-hero {
    --faq-hero-min-height: 220px;
  }

  .faq-hero-content {
    padding: 32px 18px 28px;
  }

  .faq-title {
    font-size: 1.5rem;
  }

  .faq-subtitle {
    font-size: 0.92rem;
    margin-bottom: 20px;
  }

  .faq-search-input {
    padding: 12px 16px 12px 44px;
    font-size: 0.9rem;
  }

  .faq-layout {
    flex-direction: column;
    padding: 24px 16px 48px;
    gap: 24px;
  }

  .faq-sidebar {
    width: 100%;
    position: relative;
    top: 0;
    max-height: none;
    overflow: visible;
  }

  .faq-anchor-nav {
    padding: 14px 12px;
  }

  .faq-anchor-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .faq-anchor-link {
    padding: 8px 14px;
    border-left: none;
    border-radius: 60px;
    font-size: 0.82rem;
    background: rgba(0, 229, 255, 0.04);
  }

  .faq-anchor-link:hover,
  .faq-anchor-link:focus-visible {
    padding-left: 14px;
    background: rgba(0, 229, 255, 0.12);
  }

  .faq-sidebar-cta {
    display: none;
  }

  .faq-section-header {
    gap: 12px;
  }

  .faq-section-icon {
    width: 44px;
    height: 44px;
    padding: 6px;
    border-radius: 12px;
  }

  .faq-section-icon-img {
    width: 100%;
    height: 100%;
  }

  .faq-section-title {
    font-size: 1.15rem;
  }

  .faq-question {
    padding: 14px 48px 14px 16px;
  }

  .faq-question-text {
    font-size: 0.9rem;
  }

  .faq-answer {
    padding: 12px 16px 16px;
    font-size: 0.88rem;
  }

  .faq-trust {
    margin-top: 8px;
    padding-top: 16px;
  }
}

/* 桌面（≥ 768px） */
@media (min-width: 768px) {
  .faq-hero-content {
    padding: 56px 32px 44px;
  }

  .faq-title {
    font-size: 2.6rem;
  }

  .faq-layout {
    padding: 48px 32px 80px;
    gap: 40px;
  }

  .faq-sidebar {
    width: var(--faq-sidebar-width);
  }

  .faq-section-title {
    font-size: 1.6rem;
  }

  .faq-question {
    padding: 20px 64px 20px 26px;
  }

  .faq-question-text {
    font-size: 1.02rem;
  }

  .faq-answer {
    padding: 16px 26px 22px;
    font-size: 0.95rem;
  }
}

/* 大屏（≥ 1024px） */
@media (min-width: 1024px) {
  .faq-layout {
    gap: 56px;
  }

  .faq-sidebar {
    --faq-sidebar-width: 260px;
  }

  .faq-hero-content {
    padding: 64px 40px 52px;
  }

  .faq-question:hover {
    background: rgba(0, 229, 255, 0.04);
  }
}

/* ===== 打印样式 ===== */
@media print {
  .page-faq {
    background: #fff;
    color: #222;
  }

  .faq-hero {
    min-height: auto;
    padding: 24px 0;
    background: #f5f5f5;
    border-bottom: 2px solid #ccc;
  }

  .faq-hero-bg,
  .faq-hero-overlay {
    display: none;
  }

  .faq-title {
    -webkit-text-fill-color: #111;
    background: none;
    color: #111;
  }

  .faq-search {
    display: none;
  }

  .faq-sidebar {
    display: none;
  }

  .faq-layout {
    display: block;
    padding: 24px 0;
  }

  .faq-item {
    border: 1px solid #ccc;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .faq-question-icon {
    display: none;
  }

  .faq-answer {
    color: #333;
  }

  .faq-answer a {
    color: #0A66C2;
  }

  .trust-statement {
    border-color: #ccc;
    color: #555;
  }
}