/* ===== 页面专属样式：page-faq ===== */
.page-faq {
  --faq-card-radius: 4px;
  --faq-card-border-color: rgba(44, 30, 22, 0.15);
  --faq-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  --faq-card-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.08);
  --faq-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --faq-icon-color: #00D4FF;
  --faq-answer-bg: #F5F0E8;
  --faq-label-active-bg: #FF6B00;
  --faq-label-active-text: #FFFFFF;
  --faq-label-border: rgba(0, 212, 255, 0.3);
  --faq-label-hover-border: #00D4FF;
}

/* ----- 标题区 ----- */
.page-faq .faq-header {
  padding: var(--space-6) 0 var(--space-4);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.page-faq .breadcrumb-link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-faq .breadcrumb-link:hover,
.page-faq .breadcrumb-link:focus-visible {
  color: var(--color-primary);
  outline: none;
}

.page-faq .breadcrumb-sep {
  color: var(--color-text-muted);
  font-size: 0.7rem;
}

.page-faq .breadcrumb-current {
  color: var(--color-text-light);
  font-weight: 500;
}

.page-faq .faq-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.page-faq .faq-heading {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  line-height: 1.05;
  color: var(--color-text-light);
  margin: 0;
  letter-spacing: -0.02em;
  flex: 1;
}

.page-faq .faq-header-visual {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-faq .faq-hero-icon {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--faq-card-radius);
}

.page-faq .faq-subtitle {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(0.95rem, 1.4vw, 1.15rem);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin: var(--space-3) 0 0;
  max-width: 640px;
}

/* ----- 分类标签区 ----- */
.page-faq .faq-tabs {
  margin-bottom: var(--space-6);
  position: relative;
}

.page-faq .faq-tab-icons {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-3);
}

.page-faq .faq-tab-icons-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  opacity: 0.7;
}

/* radio input 隐藏 */
.page-faq .faq-tab-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  border: 0;
  white-space: nowrap;
}

.page-faq .faq-tab-labels {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-5);
}

.page-faq .faq-tab-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--color-text-light);
  background: transparent;
  border: 1px solid var(--faq-label-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--faq-transition);
  user-select: none;
  white-space: nowrap;
}

.page-faq .faq-tab-label:hover {
  border-color: var(--faq-label-hover-border);
  color: var(--color-primary);
}

.page-faq .faq-tab-label:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 选中状态 */
.page-faq #tab-login:checked ~ .faq-tab-labels label[for="tab-login"],
.page-faq #tab-data:checked ~ .faq-tab-labels label[for="tab-data"],
.page-faq #tab-speed:checked ~ .faq-tab-labels label[for="tab-speed"],
.page-faq #tab-privacy:checked ~ .faq-tab-labels label[for="tab-privacy"] {
  background: var(--faq-label-active-bg);
  color: var(--faq-label-active-text);
  border-color: var(--faq-label-active-bg);
}

/* ----- 问题列表容器 ----- */
.page-faq .faq-list {
  display: none;
}

/* 显示选中的分类 */
.page-faq #tab-login:checked ~ .faq-list#category-login,
.page-faq #tab-data:checked ~ .faq-list#category-data,
.page-faq #tab-speed:checked ~ .faq-list#category-speed,
.page-faq #tab-privacy:checked ~ .faq-list#category-privacy {
  display: block;
}

.page-faq .faq-category {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

/* ----- 问题卡片（手风琴） ----- */
.page-faq .faq-card {
  background: var(--color-surface);
  border: 1px solid var(--faq-card-border-color);
  border-radius: var(--faq-card-radius);
  box-shadow: var(--faq-card-shadow);
  transition: box-shadow var(--faq-transition), border-color var(--faq-transition);
  overflow: hidden;
}

.page-faq .faq-card:hover {
  box-shadow: var(--faq-card-shadow-hover);
  border-color: var(--color-primary);
}

.page-faq .faq-card[open] {
  background: var(--faq-answer-bg);
  border-color: rgba(0, 212, 255, 0.2);
}

.page-faq .faq-card-summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-3);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--faq-transition);
}

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

.page-faq .faq-card-summary:hover {
  background: rgba(0, 212, 255, 0.04);
}

.page-faq .faq-card-summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  border-radius: var(--faq-card-radius);
}

.page-faq .faq-q-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--faq-icon-color);
  transition: color var(--faq-transition);
}

.page-faq .faq-card[open] .faq-q-icon {
  color: var(--color-accent);
}

.page-faq .faq-q-text {
  flex: 1;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--color-text-dark);
}

.page-faq .faq-q-arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: transform var(--faq-transition), color var(--faq-transition);
}

.page-faq .faq-card[open] .faq-q-arrow {
  transform: rotate(180deg);
  color: var(--color-accent);
}

.page-faq .faq-answer {
  padding: 0 var(--space-3) var(--space-3);
  border-top: 1px solid rgba(44, 30, 22, 0.08);
  margin-top: 0;
}

.page-faq .faq-answer p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-dark);
  margin: 0;
  padding-top: var(--space-2);
}

.page-faq .faq-answer .mono {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  padding: 0.05em 0.3em;
  border-radius: 2px;
}

.page-faq .faq-mail-link,
.page-faq .faq-internal-link {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.page-faq .faq-mail-link:hover,
.page-faq .faq-internal-link:hover,
.page-faq .faq-mail-link:focus-visible,
.page-faq .faq-internal-link:focus-visible {
  color: var(--color-primary);
  outline: none;
}

/* ----- 底部帮助区 ----- */
.page-faq .faq-help {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.page-faq .faq-help-card {
  background: var(--color-surface);
  border: 1px solid var(--faq-card-border-color);
  border-radius: var(--faq-card-radius);
  padding: var(--space-4) var(--space-5);
  text-align: center;
  box-shadow: var(--faq-card-shadow);
}

.page-faq .faq-help-text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-dark);
  margin: 0;
}

.page-faq .faq-help-link {
  color: var(--color-accent);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.page-faq .faq-help-link:hover,
.page-faq .faq-help-link:focus-visible {
  color: var(--color-primary);
  outline: none;
}

/* ===== 响应式 ===== */
/* 移动端优先，桌面增强 */
@media (min-width: 768px) {
  .page-faq .faq-header {
    padding: var(--space-8) 0 var(--space-5);
    margin-bottom: var(--space-6);
  }

  .page-faq .faq-category {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .page-faq .faq-card-summary {
    padding: var(--space-3) var(--space-4);
  }

  .page-faq .faq-answer {
    padding: 0 var(--space-4) var(--space-4);
  }

  .page-faq .faq-help-card {
    padding: var(--space-5) var(--space-8);
  }

  .page-faq .faq-tab-label {
    padding: var(--space-1) var(--space-4);
    font-size: 0.9rem;
  }

  .page-faq .faq-tab-labels {
    gap: var(--space-3);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-category {
    gap: var(--space-5);
  }

  .page-faq .faq-heading {
    font-size: 4rem;
  }

  .page-faq .faq-subtitle {
    font-size: 1.15rem;
  }

  .page-faq .faq-card-summary {
    padding: var(--space-4) var(--space-5);
  }

  .page-faq .faq-answer {
    padding: 0 var(--space-5) var(--space-5);
  }

  .page-faq .faq-q-text {
    font-size: 1.05rem;
  }

  .page-faq .faq-answer p {
    font-size: 1rem;
  }
}

/* 窄屏适配：防止横向溢出 */
@media (max-width: 480px) {
  .page-faq .faq-title-row {
    flex-direction: column;
    gap: var(--space-2);
  }

  .page-faq .faq-header-visual {
    width: 100px;
    height: 100px;
    align-self: flex-start;
  }

  .page-faq .faq-tab-labels {
    gap: var(--space-1);
  }

  .page-faq .faq-tab-label {
    font-size: 0.75rem;
    padding: var(--space-1) var(--space-2);
  }

  .page-faq .faq-card-summary {
    padding: var(--space-2) var(--space-2);
    gap: var(--space-1);
  }

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

  .page-faq .faq-answer {
    padding: 0 var(--space-2) var(--space-2);
  }

  .page-faq .faq-answer p {
    font-size: 0.88rem;
  }

  .page-faq .faq-help-card {
    padding: var(--space-3) var(--space-3);
  }
}