/* ===== 常见问答页面专属样式 ===== */
.page-faq {
  --faq-hero-min-height: 320px;
  --faq-section-gap: 2.5rem;
  --faq-accordion-gap: 0.75rem;
  --faq-radius: 12px;
  --faq-question-bg: rgba(20, 40, 63, 0.7);
  --faq-question-hover: rgba(0, 212, 255, 0.08);
  --faq-answer-bg: rgba(11, 29, 58, 0.5);
  --faq-border-color: rgba(42, 63, 90, 0.5);
  --faq-toggle-color: #FF6B35;
  --faq-icon-color: #00D4FF;
  display: flex;
  flex-direction: column;
}

/* ----- Hero 区域 ----- */
.faq-hero {
  position: relative;
  min-height: var(--faq-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--faq-border-color, #2A3F5A);
}

.faq-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.faq-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.2;
  filter: grayscale(0.6) contrast(1.2);
}

.faq-hero-overlay {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-width, 1280px);
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.breadcrumb {
  margin-bottom: 1rem;
  font-size: var(--small-size, 0.875rem);
  opacity: 0.75;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 0.6rem;
  padding: 0;
  margin: 0;
}

.breadcrumb-link {
  color: var(--color-accent-blue, #00D4FF);
  text-decoration: none;
  transition: opacity var(--transition-fast, 0.2s ease);
}

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible {
  opacity: 0.7;
  text-decoration: underline;
}

.breadcrumb-current {
  color: var(--color-text-secondary, #B0B0B8);
  pointer-events: none;
}

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--color-text-secondary, #B0B0B8);
  margin-right: 0.4rem;
}

.faq-title {
  font-family: var(--font-heading, 'Arial Black', 'Helvetica Neue', sans-serif);
  font-size: var(--h1-size, clamp(2.25rem, 5vw, 3rem));
  line-height: 1.1;
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 16px rgba(0,0,0,0.5);
}

.faq-subtitle {
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  color: var(--color-text-secondary, #B0B0B8);
  margin: 0 0 1.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ----- 搜索框 ----- */
.faq-search {
  position: relative;
  max-width: 520px;
  margin: 0 auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-accent-orange, #FF6B35);
  pointer-events: none;
  z-index: 2;
}

.faq-search-input {
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 3rem;
  font-family: var(--font-body, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif);
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  color: var(--color-text-primary, #FFFFFF);
  background: var(--faq-question-bg, rgba(20, 40, 63, 0.7));
  border: 1px solid var(--faq-border-color, rgba(42, 63, 90, 0.5));
  border-radius: var(--faq-radius, 12px);
  outline: none;
  transition: border-color var(--transition-base, 0.3s ease), box-shadow var(--transition-base, 0.3s ease);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.faq-search-input::placeholder {
  color: var(--color-text-secondary, #B0B0B8);
  opacity: 0.7;
}

.faq-search-input:focus {
  border-color: var(--color-accent-blue, #00D4FF);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}

/* ----- 问答区块 ----- */
.faq-section {
  padding: 2.5rem 1.5rem;
  border-bottom: 1px solid var(--faq-border-color, rgba(42, 63, 90, 0.5));
}

.faq-section--alt {
  background: var(--color-secondary-bg, #1A2D4A);
}

.faq-section-inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}

.faq-section-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading, 'Arial Black', 'Helvetica Neue', sans-serif);
  font-size: var(--h2-size, clamp(1.5rem, 3.5vw, 2.25rem));
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.3rem;
  line-height: 1.15;
}

.faq-section-num {
  font-family: var(--font-digit, 'Courier New', monospace);
  font-size: 0.65em;
  color: var(--color-accent-orange, #FF6B35);
  opacity: 0.8;
  letter-spacing: 0.05em;
}

.faq-section-label {
  letter-spacing: -0.01em;
}

.faq-section-desc {
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  color: var(--color-text-secondary, #B0B0B8);
  margin: 0 0 1.5rem;
  padding-left: calc(0.65em + 0.75rem + 0.75rem);
}

.faq-section-more {
  margin-top: 1.25rem;
  font-size: var(--small-size, 0.875rem);
  color: var(--color-text-secondary, #B0B0B8);
  padding-left: calc(0.65em + 0.75rem + 0.75rem);
}

.faq-inline-link {
  color: var(--color-accent-blue, #00D4FF);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}

.faq-inline-link:hover,
.faq-inline-link:focus-visible {
  border-bottom-color: var(--color-accent-blue, #00D4FF);
  color: var(--color-accent-orange, #FF6B35);
}

/* ----- 折叠面板 ----- */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--faq-accordion-gap, 0.75rem);
}

.faq-item {
  border-radius: var(--faq-radius, 12px);
  overflow: hidden;
  background: var(--faq-question-bg, rgba(20, 40, 63, 0.7));
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--faq-border-color, rgba(42, 63, 90, 0.5));
  transition: border-color var(--transition-base, 0.3s ease), box-shadow var(--transition-base, 0.3s ease);
}

.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
}

.faq-item:focus-within {
  border-color: var(--color-accent-blue, #00D4FF);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--color-text-primary, #FFFFFF);
  font-family: var(--font-body, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast, 0.2s ease);
  line-height: 1.4;
  position: relative;
}

.faq-question:hover {
  background: var(--faq-question-hover, rgba(0, 212, 255, 0.08));
}

.faq-question:focus-visible {
  outline: 2px solid var(--color-accent-blue, #00D4FF);
  outline-offset: -2px;
  border-radius: var(--faq-radius, 12px);
}

.faq-q-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 107, 53, 0.15);
  color: var(--color-accent-orange, #FF6B35);
  font-family: var(--font-digit, 'Courier New', monospace);
  font-size: 0.85rem;
  font-weight: 700;
}

.faq-q-text {
  flex: 1;
  min-width: 0;
}

.faq-toggle {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 107, 53, 0.1);
  color: var(--faq-toggle-color, #FF6B35);
  transition: transform var(--transition-base, 0.3s ease), background var(--transition-fast, 0.2s ease);
}

.faq-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-base, 0.3s ease);
}

/* 展开状态 */
.faq-question[aria-expanded="true"] .faq-toggle svg {
  transform: rotate(180deg);
}

.faq-question[aria-expanded="true"] .faq-toggle {
  background: rgba(255, 107, 53, 0.2);
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition-base, 0.35s ease);
  padding: 0 1.25rem;
}

.faq-question[aria-expanded="true"] + .faq-answer {
  grid-template-rows: 1fr;
}

.faq-answer-inner {
  overflow: hidden;
  padding: 0 0 1.25rem;
  color: var(--color-text-secondary, #B0B0B8);
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  line-height: 1.65;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-start;
}

.faq-answer-inner p {
  margin: 0 0 0.5rem;
  flex: 1 1 240px;
}

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

.faq-answer-thumb {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--faq-border-color, rgba(42, 63, 90, 0.5));
  background: var(--color-card-bg, #14283F);
}

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

/* ----- 底部联系 ----- */
.faq-contact {
  padding: 3rem 1.5rem 2.5rem;
  background: var(--color-primary-bg, #0B1D3A);
  border-top: 1px solid var(--faq-border-color, rgba(42, 63, 90, 0.5));
}

.faq-contact-inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  text-align: center;
}

.faq-contact-heading {
  font-family: var(--font-heading, 'Arial Black', 'Helvetica Neue', sans-serif);
  font-size: var(--h2-size, clamp(1.5rem, 3.5vw, 2.25rem));
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.75rem;
}

.faq-contact-text {
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  color: var(--color-text-secondary, #B0B0B8);
  max-width: 580px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.faq-contact-channels {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.5rem;
  margin-bottom: 1.25rem;
}

.faq-contact-channel {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent-blue, #00D4FF);
  text-decoration: none;
  font-size: var(--body-size, clamp(0.875rem, 1.2vw, 1rem));
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.12);
  transition: background var(--transition-fast, 0.2s ease), border-color var(--transition-fast, 0.2s ease);
}

.faq-contact-channel:hover,
.faq-contact-channel:focus-visible {
  background: rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.3);
}

.channel-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  color: var(--color-accent-orange, #FF6B35);
  opacity: 0.8;
}

.faq-contact-address {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-secondary, #B0B0B8);
  font-size: var(--small-size, 0.875rem);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
}

.faq-contact-note {
  font-size: var(--small-size, 0.875rem);
  color: var(--color-text-secondary, #B0B0B8);
  opacity: 0.75;
  max-width: 480px;
  margin: 0 auto;
  font-style: italic;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .faq-hero {
    min-height: 260px;
  }

  .faq-hero-overlay {
    padding: 1.5rem 1rem 1.25rem;
  }

  .faq-title {
    font-size: 1.75rem;
  }

  .faq-subtitle {
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }

  .faq-search-input {
    padding: 0.7rem 0.85rem 0.7rem 2.5rem;
    font-size: 0.9rem;
  }

  .search-icon {
    left: 12px;
  }

  .faq-section {
    padding: 1.75rem 1rem;
  }

  .faq-section-heading {
    font-size: 1.35rem;
    gap: 0.5rem;
  }

  .faq-section-num {
    font-size: 0.6em;
  }

  .faq-section-desc,
  .faq-section-more {
    padding-left: 0;
  }

  .faq-question {
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    gap: 0.5rem;
  }

  .faq-answer {
    padding: 0 1rem;
  }

  .faq-answer-inner {
    padding-bottom: 1rem;
    flex-direction: column;
  }

  .faq-answer-thumb {
    width: 80px;
    height: 80px;
  }

  .faq-contact {
    padding: 2rem 1rem 1.75rem;
  }

  .faq-contact-heading {
    font-size: 1.35rem;
  }

  .faq-contact-channels {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .faq-contact-channel,
  .faq-contact-address {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }
}

@media (min-width: 641px) and (max-width: 1023px) {
  .faq-hero-overlay {
    padding: 2rem 2rem 1.75rem;
  }

  .faq-section {
    padding: 2rem 2rem;
  }

  .faq-contact {
    padding: 2.5rem 2rem;
  }

  .faq-answer-thumb {
    width: 100px;
    height: 100px;
  }
}

@media (min-width: 1024px) {
  .faq-hero {
    min-height: 360px;
  }

  .faq-hero-overlay {
    padding: 3rem 2rem 2.5rem;
  }

  .faq-section {
    padding: 3rem 2rem;
  }

  .faq-section-inner {
    display: flow-root;
  }

  .faq-section-desc {
    max-width: 600px;
  }

  .faq-answer-inner {
    flex-wrap: nowrap;
    gap: 1.5rem;
  }

  .faq-answer-thumb {
    width: 140px;
    height: 140px;
  }

  .faq-contact {
    padding: 4rem 2rem 3rem;
  }
}

/* ===== 渐进增强：JS 不可用时折叠面板仍可读 ===== */
.faq-answer {
  grid-template-rows: 1fr;
}

.faq-question[aria-expanded="false"] + .faq-answer {
  grid-template-rows: 0fr;
}

/* 无 JS 时默认全部展开 */
@media (scripting: none) {
  .faq-answer {
    grid-template-rows: 1fr !important;
  }

  .faq-toggle {
    display: none;
  }
}