/* ===== 页面作用域：问答中心 ===== */
.page-faq {
  --cat-version: #FF4500;
  --cat-records: #1E90FF;
  --cat-export: #FFD700;
  --cat-adapt: #00FF7F;
  --cat-services: #FF6A33;
  --cat-feedback: #4DA6FF;
  --faq-tab-radius: 8px;
  --faq-item-border-width: 4px;

  padding-top: calc(var(--header-height, 56px) + 24px);
  padding-bottom: 80px;
  background-color: var(--color-bg, #0A0A0A);
  color: var(--color-text, #FFFFFF);
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  line-height: 1.6;
}

.page-faq .container {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 16px;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: var(--color-text-secondary, #B0B0B0);
}

.page-faq .breadcrumb__link {
  color: var(--color-secondary, #1E90FF);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}

.page-faq .breadcrumb__link:hover,
.page-faq .breadcrumb__link:focus-visible {
  color: var(--color-primary, #FF4500);
  outline: 2px solid var(--color-primary, #FF4500);
  outline-offset: 2px;
  border-radius: 2px;
}

.page-faq .breadcrumb__separator {
  color: var(--color-border, #333333);
  user-select: none;
}

.page-faq .breadcrumb__current {
  color: var(--color-text, #FFFFFF);
  font-weight: 600;
}

/* 标题区 */
.page-faq .faq__title {
  font-family: var(--font-display, 'Impact', 'Arial Black', sans-serif);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 8px 0;
  color: var(--color-text, #FFFFFF);
  line-height: 1.15;
}

.page-faq .faq__subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary, #B0B0B0);
  margin: 0 0 32px 0;
  max-width: 680px;
}

/* ===== 分类标签栏 ===== */
.page-faq .faq-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  position: relative;
  z-index: 2;
}

.page-faq .faq-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-secondary, #B0B0B0);
  background: transparent;
  border: 1.5px solid var(--color-border, #333333);
  border-radius: var(--faq-tab-radius, 8px);
  cursor: pointer;
  transition: all var(--transition, 0.25s ease);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, calc(100% - 6px) 100%, 0 100%);
  white-space: nowrap;
}

.page-faq .faq-tab:hover {
  border-color: var(--color-primary, #FF4500);
  color: var(--color-text, #FFFFFF);
  background: rgba(255, 69, 0, 0.08);
}

.page-faq .faq-tab:focus-visible {
  outline: 2px solid var(--color-primary, #FF4500);
  outline-offset: 2px;
  border-color: var(--color-primary, #FF4500);
}

.page-faq .faq-tab.is-active {
  color: var(--color-bg, #0A0A0A);
  background: var(--color-primary, #FF4500);
  border-color: var(--color-primary, #FF4500);
}

.page-faq .faq-tab.is-active:hover {
  background: #e63d00;
  border-color: #e63d00;
}

.page-faq .faq-tab__icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
  border-radius: 2px;
}

.page-faq .faq-tab.is-active .faq-tab__icon {
  filter: brightness(0) saturate(100%) invert(6%) sepia(7%) saturate(0%) hue-rotate(0deg);
}

/* ===== 装饰分隔带 ===== */
.page-faq .faq-divider {
  position: relative;
  height: 80px;
  margin-bottom: 32px;
  overflow: hidden;
  border-radius: var(--radius-md, 8px);
  background: var(--color-bg-alt, #111111);
}

.page-faq .faq-divider__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  pointer-events: none;
}

.page-faq .faq-divider__speedline {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    transparent 0px,
    transparent 28px,
    rgba(255, 69, 0, 0.12) 28px,
    rgba(255, 69, 0, 0.12) 30px,
    transparent 30px,
    transparent 58px
  );
  pointer-events: none;
  animation: faqSpeedlineMove 2s linear infinite;
}

@keyframes faqSpeedlineMove {
  0% { transform: translateX(0); }
  100% { transform: translateX(58px); }
}

/* ===== 问题列表区域 ===== */
.page-faq .faq-groups {
  position: relative;
}

.page-faq .faq-group {
  display: block;
  margin-bottom: 40px;
  animation: faqFadeIn 0.35s ease forwards;
}

.page-faq .faq-group[data-category]:not([style*="display: none"]) {
  /* 默认显示，JS 控制隐藏 */
}

@keyframes faqFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .faq-group__title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display, 'Impact', 'Arial Black', sans-serif);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border, #333333);
  color: var(--color-text, #FFFFFF);
}

.page-faq .faq-group__number {
  font-family: var(--font-mono, 'Consolas', 'Source Code Pro', monospace);
  font-size: 0.9rem;
  color: var(--color-primary, #FF4500);
  opacity: 0.7;
  letter-spacing: 0.05em;
}

.page-faq .faq-group__items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ===== 单个问题项（手风琴） ===== */
.page-faq .faq-item {
  border: 1px solid var(--color-border, #333333);
  border-left-width: var(--faq-item-border-width, 4px);
  border-radius: 0 var(--radius-sm, 4px) var(--radius-sm, 4px) 0;
  background: var(--color-bg-alt, #111111);
  transition: border-color var(--transition, 0.25s ease),
              background var(--transition, 0.25s ease);
  overflow: hidden;
}

/* 每个分类的左边框颜色 */
.page-faq .faq-group[data-category="version"] .faq-item {
  border-left-color: var(--cat-version, #FF4500);
}

.page-faq .faq-group[data-category="records"] .faq-item {
  border-left-color: var(--cat-records, #1E90FF);
}

.page-faq .faq-group[data-category="export"] .faq-item {
  border-left-color: var(--cat-export, #FFD700);
}

.page-faq .faq-group[data-category="adapt"] .faq-item {
  border-left-color: var(--cat-adapt, #00FF7F);
}

.page-faq .faq-group[data-category="services"] .faq-item {
  border-left-color: var(--cat-services, #FF6A33);
}

.page-faq .faq-group[data-category="feedback"] .faq-item {
  border-left-color: var(--cat-feedback, #4DA6FF);
}

.page-faq .faq-item:hover {
  border-color: var(--color-text-secondary, #B0B0B0);
  border-left-width: var(--faq-item-border-width, 4px);
  background: #1a1a1a;
}

/* 悬停时左边框变色（交互增强） */
.page-faq .faq-group[data-category="version"] .faq-item:hover {
  border-left-color: #ff6a33;
}

.page-faq .faq-group[data-category="records"] .faq-item:hover {
  border-left-color: #4da6ff;
}

.page-faq .faq-group[data-category="export"] .faq-item:hover {
  border-left-color: #ffe44d;
}

.page-faq .faq-group[data-category="adapt"] .faq-item:hover {
  border-left-color: #33ff99;
}

.page-faq .faq-group[data-category="services"] .faq-item:hover {
  border-left-color: #ff854d;
}

.page-faq .faq-group[data-category="feedback"] .faq-item:hover {
  border-left-color: #70b8ff;
}

.page-faq .faq-item:focus-within {
  outline: none;
  border-color: var(--color-secondary, #1E90FF);
  box-shadow: 0 0 0 2px rgba(30, 144, 255, 0.25);
}

/* 问题标题（summary） */
.page-faq .faq-item__question {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px 14px 14px;
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text, #FFFFFF);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition, 0.25s ease);
}

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

.page-faq .faq-item__question::marker {
  display: none;
  content: "";
}

.page-faq .faq-item__question:hover {
  color: var(--color-primary, #FF4500);
}

.page-faq .faq-item__mark {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-family: var(--font-display, 'Impact', 'Arial Black', sans-serif);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary, #FF4500);
  background: rgba(255, 69, 0, 0.12);
  border-radius: 50%;
  line-height: 1;
  transition: background var(--transition, 0.25s ease),
              color var(--transition, 0.25s ease);
}

.page-faq .faq-item__question:hover .faq-item__mark {
  background: var(--color-primary, #FF4500);
  color: var(--color-bg, #0A0A0A);
}

.page-faq .faq-item__text {
  flex: 1;
  min-width: 0;
}

.page-faq .faq-item__icon {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  position: relative;
  transition: transform var(--transition, 0.25s ease);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--color-text-secondary, #B0B0B0);
  transition: background var(--transition, 0.25s ease),
              transform var(--transition, 0.25s ease);
}

.page-faq .faq-item__icon::before {
  width: 100%;
  height: 2px;
  top: 5px;
  left: 0;
}

.page-faq .faq-item__icon::after {
  width: 2px;
  height: 100%;
  top: 0;
  left: 5px;
}

.page-faq .faq-item__question:hover .faq-item__icon::before,
.page-faq .faq-item__question:hover .faq-item__icon::after {
  background: var(--color-primary, #FF4500);
}

.page-faq details[open] .faq-item__icon {
  transform: rotate(45deg);
}

/* 答案区域 */
.page-faq .faq-item__answer {
  padding: 0 16px 16px 46px;
  font-size: 0.9rem;
  color: var(--color-text-secondary, #B0B0B0);
  line-height: 1.7;
  animation: faqAnswerSlide 0.3s ease forwards;
  transform-origin: top center;
}

@keyframes faqAnswerSlide {
  from {
    opacity: 0;
    transform: translateY(-6px) scaleY(0.97);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0) scaleY(1);
    max-height: 600px;
  }
}

.page-faq .faq-item__answer p {
  margin: 0 0 10px 0;
}

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

.page-faq .faq-item__answer a {
  color: var(--color-secondary, #1E90FF);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition, 0.25s ease);
}

.page-faq .faq-item__answer a:hover {
  color: var(--color-primary, #FF4500);
}

/* 答案中的等宽数字 */
.page-faq .faq-item__answer .data-number {
  font-family: var(--font-mono, 'Consolas', 'Source Code Pro', monospace);
  color: var(--color-accent, #FFD700);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* 示意图 */
.page-faq .faq-figure {
  margin: 12px 0 0 0;
  padding: 0;
  display: inline-block;
  max-width: 100%;
}

.page-faq .faq-figure__img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm, 4px);
  border: 1px solid var(--color-border, #333333);
  display: block;
  object-fit: cover;
}

.page-faq .faq-figure__cap {
  font-size: 0.75rem;
  color: var(--color-text-secondary, #B0B0B0);
  margin-top: 4px;
  font-style: italic;
  opacity: 0.8;
}

/* ===== 底部引导 ===== */
.page-faq .faq-cta {
  margin-top: 48px;
  padding: 32px 24px;
  text-align: center;
  border-top: 1px solid var(--color-border, #333333);
  border-bottom: 1px solid var(--color-border, #333333);
}

.page-faq .faq-cta__text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text, #FFFFFF);
  margin: 0 0 16px 0;
}

.page-faq .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md, 8px);
  cursor: pointer;
  transition: all var(--transition, 0.25s ease);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, calc(100% - 8px) 100%, 0 100%);
}

.page-faq .btn--primary {
  color: var(--color-bg, #0A0A0A);
  background: var(--color-primary, #FF4500);
  box-shadow: 0 0 16px rgba(255, 69, 0, 0.25);
}

.page-faq .btn--primary:hover {
  background: #e63d00;
  box-shadow: 0 0 28px rgba(255, 69, 0, 0.45);
  transform: translateY(-1px);
}

.page-faq .btn--primary:focus-visible {
  outline: 2px solid var(--color-primary, #FF4500);
  outline-offset: 3px;
}

/* ===== 移动端优先适配 ===== */
@media (max-width: 639px) {
  .page-faq {
    padding-top: calc(var(--header-height, 56px) + 16px);
    padding-bottom: 56px;
  }

  .page-faq .container {
    padding: 0 12px;
  }

  .page-faq .faq__title {
    font-size: 1.5rem;
  }

  .page-faq .faq__subtitle {
    font-size: 0.9rem;
    margin-bottom: 24px;
  }

  .page-faq .faq-tabs {
    gap: 6px;
    margin-bottom: 20px;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border, #333333) transparent;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .page-faq .faq-tabs::-webkit-scrollbar {
    height: 3px;
  }

  .page-faq .faq-tabs::-webkit-scrollbar-thumb {
    background: var(--color-border, #333333);
    border-radius: 2px;
  }

  .page-faq .faq-tab {
    padding: 6px 12px;
    font-size: 0.78rem;
    flex-shrink: 0;
  }

  .page-faq .faq-tab__icon {
    width: 16px;
    height: 16px;
  }

  .page-faq .faq-divider {
    height: 56px;
    margin-bottom: 24px;
  }

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

  .page-faq .faq-item__question {
    padding: 12px 12px 12px 10px;
    font-size: 0.875rem;
  }

  .page-faq .faq-item__answer {
    padding: 0 12px 14px 40px;
    font-size: 0.85rem;
  }

  .page-faq .faq-item__mark {
    width: 20px;
    height: 20px;
    font-size: 0.75rem;
  }

  .page-faq .faq-figure {
    width: 100%;
  }

  .page-faq .faq-figure__img {
    width: 100%;
    max-width: 280px;
  }

  .page-faq .faq-cta {
    margin-top: 32px;
    padding: 24px 16px;
  }

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

  .page-faq .btn {
    padding: 8px 22px;
    font-size: 0.85rem;
  }
}

/* ===== 桌面增强 ===== */
@media (min-width: 640px) {
  .page-faq .container {
    padding: 0 24px;
  }

  .page-faq .faq-tabs {
    gap: 10px;
    margin-bottom: 32px;
  }

  .page-faq .faq-tab {
    padding: 10px 20px;
    font-size: 0.9rem;
  }

  .page-faq .faq-tab__icon {
    width: 22px;
    height: 22px;
  }

  .page-faq .faq-divider {
    height: 96px;
    margin-bottom: 40px;
    border-radius: var(--radius-md, 8px);
  }

  .page-faq .faq-group__title {
    font-size: 1.35rem;
  }

  .page-faq .faq-item__question {
    padding: 16px 20px 16px 16px;
    font-size: 0.95rem;
  }

  .page-faq .faq-item__answer {
    padding: 0 20px 20px 50px;
    font-size: 0.9rem;
  }

  .page-faq .faq-cta {
    padding: 40px 32px;
  }

  /* 桌面端问题列表两栏网格 */
  .page-faq .faq-group__items {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .page-faq .faq-item {
    margin-bottom: 0;
  }

  .page-faq .faq-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
  }

  .page-faq .faq-cta__text {
    margin-bottom: 0;
  }
}

/* ===== 宽屏微调 ===== */
@media (min-width: 1024px) {
  .page-faq .container {
    padding: 0 32px;
  }

  .page-faq .faq__subtitle {
    font-size: 1.1rem;
  }

  .page-faq .faq-group__items {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
}