/* ===== 页面作用域：.page-faq ===== */
.page-faq {
  --faq-grid-bg: repeating-linear-gradient(0deg, rgba(139,92,246,0.03) 0px, rgba(139,92,246,0.03) 1px, transparent 1px, transparent 20px), repeating-linear-gradient(90deg, rgba(139,92,246,0.03) 0px, rgba(139,92,246,0.03) 1px, transparent 1px, transparent 20px);
  --faq-border-color: rgba(139,92,246,0.25);
  --faq-glow-accent: drop-shadow(0 0 6px rgba(139,92,246,0.4));
  --faq-accordion-transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --faq-tag-min: 0.75rem;
  --faq-tag-max: 1.25rem;

  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--color-bg-primary, #0a0a0f);
  color: var(--color-text-primary, #e2e8f0);
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
  position: relative;
}

/* 背景网格 */
.page-faq::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: var(--faq-grid-bg);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.page-faq > * {
  position: relative;
  z-index: 1;
}

/* ============================
   档案头
   ============================ */
.faq-archive-header {
  padding: 2rem 1rem 1rem;
  border-bottom: 1px solid var(--faq-border-color);
  background: rgba(10,10,15,0.7);
  backdrop-filter: blur(4px);
}

.faq-archive-header-inner {
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
}

.faq-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  color: var(--color-text-secondary, #94a3b8);
  margin-bottom: 0.75rem;
  letter-spacing: 0.5px;
}

.faq-breadcrumb a {
  color: var(--color-brand-end, #06b6d4);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s);
}

.faq-breadcrumb a:hover {
  color: var(--color-accent, #f97316);
}

.faq-breadcrumb-sep {
  color: var(--color-brand-start, #8b5cf6);
  opacity: 0.6;
  font-size: 0.7rem;
}

.faq-archive-title {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin: 0 0 0.25rem;
  line-height: 1.2;
}

.faq-archive-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary, #94a3b8);
  margin: 0;
  letter-spacing: 0.3px;
}

/* ============================
   搜索区
   ============================ */
.faq-search-section {
  padding: 1.5rem 1rem;
  background: rgba(22,33,62,0.4);
  border-bottom: 1px solid var(--faq-border-color);
}

.faq-search-outer {
  max-width: 680px;
  margin: 0 auto;
}

.faq-search-bar {
  display: flex;
  align-items: center;
  background: var(--color-bg-secondary, #1a1a2e);
  border: 1px solid var(--faq-border-color);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  position: relative;
  transition: border-color var(--transition-fast, 0.2s), box-shadow var(--transition-fast, 0.2s);
}

.faq-search-bar:focus-within {
  border-color: var(--color-brand-start, #8b5cf6);
  box-shadow: 0 0 12px rgba(139,92,246,0.25), inset 0 0 8px rgba(139,92,246,0.08);
}

.faq-search-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.85;
}

.faq-search-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.75rem 0.5rem;
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
  font-size: 1rem;
  color: var(--color-text-primary, #e2e8f0);
  outline: none;
  min-width: 0;
}

.faq-search-input::placeholder {
  color: var(--color-text-secondary, #94a3b8);
  opacity: 0.7;
}

.faq-search-border {
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-brand-start, #8b5cf6), var(--color-brand-end, #06b6d4));
  transition: width 0.4s ease;
}

.faq-search-bar:focus-within .faq-search-border {
  width: 100%;
}

/* 搜索建议 */
.faq-suggest-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0 0.25rem;
}

.faq-suggest-item {
  font-size: 0.75rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  color: var(--color-text-secondary, #94a3b8);
  background: rgba(139,92,246,0.08);
  border: 1px solid rgba(139,92,246,0.15);
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  cursor: default;
  transition: background var(--transition-fast, 0.2s), color var(--transition-fast, 0.2s);
  letter-spacing: 0.3px;
}

.faq-suggest-item:hover {
  background: rgba(139,92,246,0.2);
  color: var(--color-text-primary, #e2e8f0);
}

/* ============================
   热门问题 · 标签云
   ============================ */
.faq-hot-section {
  padding: 2rem 1rem 1.5rem;
  border-bottom: 1px solid var(--faq-border-color);
  background: rgba(16,21,40,0.5);
  position: relative;
  overflow: hidden;
}

.faq-hot-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(45deg, transparent, transparent 40px, rgba(139,92,246,0.02) 40px, rgba(139,92,246,0.02) 41px);
  pointer-events: none;
  z-index: 0;
}

.faq-hot-heading {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 1.1rem;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  position: relative;
  z-index: 1;
}

.faq-hot-number {
  font-size: 0.85rem;
  color: var(--color-text-secondary, #94a3b8);
  font-weight: 400;
  opacity: 0.7;
}

.faq-hot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.8rem;
  position: relative;
  z-index: 1;
  align-items: baseline;
}

.faq-hot-tag {
  text-decoration: none;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-weight: 600;
  letter-spacing: 1px;
  padding: 0.2rem 0.8rem;
  border: 1px solid var(--faq-border-color);
  border-radius: 2px;
  background: rgba(10,10,15,0.5);
  color: var(--tag-color, var(--color-text-primary, #e2e8f0));
  transition: all var(--transition-fast, 0.2s);
  position: relative;
  font-size: var(--faq-tag-min);
  text-transform: uppercase;
  backdrop-filter: blur(2px);
}

.faq-hot-tag[data-tag-size="sm"] { font-size: 0.7rem; padding: 0.15rem 0.6rem; }
.faq-hot-tag[data-tag-size="md"] { font-size: 0.85rem; padding: 0.25rem 1rem; }
.faq-hot-tag[data-tag-size="lg"] { font-size: 1.05rem; padding: 0.3rem 1.2rem; }

.faq-hot-tag::before {
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--tag-color, transparent), transparent 60%) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-fast, 0.2s);
}

.faq-hot-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(139,92,246,0.25);
  border-color: var(--tag-color, var(--color-brand-start, #8b5cf6));
  background: rgba(10,10,15,0.8);
}

.faq-hot-tag:hover::before {
  opacity: 1;
}

/* 热门视觉图 */
.faq-hot-visual {
  margin-top: 1.25rem;
  display: flex;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.faq-hot-img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  opacity: 0.6;
  filter: drop-shadow(0 0 12px rgba(139,92,246,0.25)) hue-rotate(320deg);
  transition: opacity var(--transition-smooth, 0.4s);
}

.faq-hot-img:hover {
  opacity: 0.9;
}

/* ============================
   FAQ 列表 · 手风琴
   ============================ */
.faq-list-section {
  padding: 1.5rem 1rem 2rem;
  background: transparent;
}

.faq-list-rail {
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.faq-group {
  border-left: 2px solid var(--faq-border-color);
  padding-left: 1rem;
  position: relative;
}

.faq-group::before {
  content: '';
  position: absolute;
  left: -2px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-brand-start, #8b5cf6), var(--color-brand-end, #06b6d4), transparent 80%);
  opacity: 0.3;
}

.faq-group-title {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 1rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text-primary, #e2e8f0);
  margin: 0 0 1rem;
  padding: 0.3rem 0 0.3rem 0.5rem;
  border-bottom: 1px solid rgba(139,92,246,0.15);
  display: inline-block;
  filter: var(--faq-glow-accent);
}

.faq-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 手风琴面板 */
.faq-item {
  background: rgba(26,26,46,0.5);
  border: 1px solid var(--faq-border-color);
  border-radius: 2px;
  transition: border-color var(--transition-fast, 0.2s), box-shadow var(--transition-fast, 0.2s);
  overflow: hidden;
  backdrop-filter: blur(2px);
}

.faq-item[open] {
  border-color: rgba(139,92,246,0.5);
  box-shadow: 0 0 12px rgba(139,92,246,0.1), inset 0 0 20px rgba(139,92,246,0.03);
}

.faq-item-summary {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-primary, #e2e8f0);
  list-style: none;
  user-select: none;
  transition: background var(--transition-fast, 0.2s);
  position: relative;
}

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

.faq-item-summary:hover {
  background: rgba(139,92,246,0.06);
}

.faq-item-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  color: var(--color-brand-start, #8b5cf6);
  opacity: 0.7;
  min-width: 1.8em;
  letter-spacing: 0.5px;
}

.faq-item-arrow {
  margin-left: auto;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  position: relative;
  transition: transform var(--faq-accordion-transition);
}

.faq-item-arrow::before,
.faq-item-arrow::after {
  content: '';
  position: absolute;
  background: var(--color-brand-start, #8b5cf6);
  border-radius: 1px;
  transition: transform var(--faq-accordion-transition);
}

.faq-item-arrow::before {
  width: 10px;
  height: 2px;
  top: 7px;
  left: 3px;
}

.faq-item-arrow::after {
  width: 2px;
  height: 10px;
  top: 3px;
  left: 7px;
}

.faq-item[open] .faq-item-arrow {
  transform: rotate(45deg);
}

.faq-item[open] .faq-item-arrow::after {
  transform: scaleY(0);
}

.faq-item-body {
  padding: 0 1rem 1rem 2.8rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-secondary, #94a3b8);
  border-top: 1px solid rgba(139,92,246,0.08);
  animation: faq-body-fade 0.35s ease;
}

@keyframes faq-body-fade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.faq-item-body p {
  margin: 0.5rem 0;
}

.faq-item-body ul {
  margin: 0.4rem 0;
  padding-left: 1.2rem;
}

.faq-item-body li {
  margin-bottom: 0.3rem;
}

.faq-inline-link {
  color: var(--color-brand-end, #06b6d4);
  text-decoration: none;
  border-bottom: 1px solid rgba(6,182,212,0.3);
  transition: color var(--transition-fast, 0.2s), border-color var(--transition-fast, 0.2s);
}

.faq-inline-link:hover {
  color: var(--color-accent, #f97316);
  border-color: rgba(249,115,22,0.4);
}

/* 联系方式列表特殊样式 */
.faq-contact-list {
  list-style: none;
  padding-left: 0 !important;
}

.faq-contact-list li {
  padding: 0.2rem 0;
  font-size: 0.85rem;
}

.faq-contact-list strong {
  color: var(--color-text-primary, #e2e8f0);
  font-weight: 600;
}

.faq-contact-note {
  font-size: 0.8rem;
  color: var(--color-text-secondary, #94a3b8);
  margin-top: 0.5rem;
  font-style: italic;
  opacity: 0.8;
}

/* 其他帮助区配图 */
.faq-other-visual {
  margin-top: 1rem;
  display: flex;
  justify-content: flex-end;
  padding-right: 0.5rem;
}

.faq-other-img {
  width: 50px;
  height: 50px;
  object-fit: contain;
  opacity: 0.5;
  filter: drop-shadow(0 0 8px rgba(249,115,22,0.3));
  transition: opacity var(--transition-fast, 0.2s);
}

.faq-other-img:hover {
  opacity: 0.9;
}

/* ============================
   CTA 区
   ============================ */
.faq-cta-section {
  padding: 2.5rem 1rem;
  background: linear-gradient(135deg, rgba(139,92,246,0.06), rgba(6,182,212,0.04));
  border-top: 1px solid var(--faq-border-color);
  text-align: center;
}

.faq-cta-inner {
  max-width: 520px;
  margin: 0 auto;
}

.faq-cta-heading {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 1.2rem;
  letter-spacing: 2px;
  margin: 0 0 0.5rem;
  filter: var(--faq-glow-accent);
}

.faq-cta-desc {
  color: var(--color-text-secondary, #94a3b8);
  font-size: 0.9rem;
  margin: 0 0 1.25rem;
}

.faq-cta-btn {
  display: inline-block;
  padding: 0.7rem 2rem;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--color-brand-start, #8b5cf6), var(--color-brand-end, #06b6d4));
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: transform var(--transition-fast, 0.2s), box-shadow var(--transition-fast, 0.2s);
  position: relative;
  overflow: hidden;
}

.faq-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(139,92,246,0.35);
}

.faq-cta-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.faq-cta-btn:hover::after {
  transform: translateX(100%);
}

/* ============================
   文本工具类（作用域内）
   ============================ */
.page-faq .text-gradient {
  background: linear-gradient(135deg, var(--color-brand-start, #8b5cf6), var(--color-brand-end, #06b6d4));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================
   响应式 · 移动端优先
   ============================ */

/* ≥600px 平板 */
@media (min-width: 600px) {
  .faq-archive-header {
    padding: 2.5rem 2rem 1.25rem;
  }

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

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

  .faq-hot-section {
    padding: 2.5rem 2rem 2rem;
  }

  .faq-hot-tags {
    gap: 0.8rem 1rem;
  }

  .faq-hot-img {
    width: 160px;
    height: 160px;
  }

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

  .faq-group {
    padding-left: 1.5rem;
  }

  .faq-group-title {
    font-size: 1.1rem;
  }

  .faq-item-summary {
    font-size: 0.95rem;
    padding: 1rem 1.2rem;
  }

  .faq-item-body {
    padding-left: 3.2rem;
    padding-right: 1.5rem;
  }

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

  .faq-cta-heading {
    font-size: 1.4rem;
  }

  .faq-other-visual {
    padding-right: 1rem;
  }

  .faq-other-img {
    width: 60px;
    height: 60px;
  }
}

/* ≥960px 桌面 */
@media (min-width: 960px) {
  .faq-archive-header {
    padding: 3rem 2rem 1.5rem;
  }

  .faq-archive-title {
    font-size: 3rem;
  }

  .faq-archive-desc {
    font-size: 1rem;
  }

  .faq-search-section {
    padding: 2.5rem 2rem;
  }

  .faq-hot-section {
    padding: 3rem 2rem 2.5rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: start;
  }

  .faq-hot-heading {
    grid-column: 1 / -1;
  }

  .faq-hot-tags {
    grid-column: 1 / 2;
  }

  .faq-hot-visual {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
    margin-top: 0;
  }

  .faq-hot-img {
    width: 180px;
    height: 180px;
  }

  .faq-list-section {
    padding: 2.5rem 2rem 4rem;
  }

  .faq-list-rail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem 2.5rem;
    align-items: start;
  }

  .faq-group {
    padding-left: 1.5rem;
    break-inside: avoid;
  }

  .faq-group:last-child {
    grid-column: 1 / -1;
    max-width: 640px;
  }

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

  .faq-item-summary {
    font-size: 0.95rem;
    padding: 1rem 1.2rem;
  }

  .faq-cta-section {
    padding: 4rem 2rem;
  }

  .faq-cta-heading {
    font-size: 1.6rem;
  }

  .faq-other-visual {
    padding-right: 2rem;
  }
}

/* ≥1200px 宽屏 */
@media (min-width: 1200px) {
  .faq-archive-header {
    padding: 3.5rem 2rem 1.75rem;
  }

  .faq-archive-title {
    font-size: 3.4rem;
  }

  .faq-list-rail {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem 3rem;
  }

  .faq-hot-img {
    width: 200px;
    height: 200px;
  }
}

/* ============================
   无 JS 回退：details 默认闭合
   ============================ */
.faq-item:not([open]) .faq-item-body {
  display: none;
}

.faq-item[open] .faq-item-body {
  display: block;
}

/* ============================
   打印
   ============================ */
@media print {
  .page-faq {
    background: #fff;
    color: #111;
  }

  .page-faq::before { display: none; }

  .faq-search-section,
  .faq-hot-section,
  .faq-cta-section { display: none; }

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

  .faq-item-body {
    display: block !important;
  }
}

.page-faq {
  --tag-color: transparent;
}