/* ===== page-faq 问答中心专属样式 ===== */
.page-faq {
  --faq-gap: 1.25rem;
  --faq-aside-width: 280px;
  --faq-icon-size: 2.5rem;
  --faq-glow-gold: 0 0 16px rgba(255, 215, 0, 0.4);
  --faq-glow-cyan: 0 0 14px rgba(0, 229, 255, 0.25);
  --faq-step-size: 2.25rem;
  --faq-line-width: 3px;

  background-color: var(--color-base-dark, #0A1F3F);
  color: var(--color-text-primary, #E0E6ED);
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  padding: var(--space-lg, 2rem) 0 var(--space-xl, 4rem) 0;
  min-height: 60vh;
}

/* 容器 */
.page-faq__container {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 var(--space-sm, 1rem);
}

/* 面包屑 */
.page-faq .breadcrumb {
  margin-bottom: var(--space-md, 1.5rem);
  padding: 0;
}
.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
}
.page-faq .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-text-secondary, #8A9BAE);
  opacity: 0.5;
  margin-right: 0.25rem;
}
.page-faq .breadcrumb__link {
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  transition: opacity 0.2s ease;
}
.page-faq .breadcrumb__link:hover,
.page-faq .breadcrumb__link:focus-visible {
  opacity: 0.75;
  text-decoration: underline;
}
.page-faq .breadcrumb__item[aria-current="page"] {
  color: var(--color-accent-gold, #FFD700);
  font-weight: 600;
}

/* 非对称网格 */
.page-faq__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg, 2.5rem);
}

/* 侧边栏 */
.page-faq__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1.5rem);
  padding: var(--space-md, 1.5rem);
  background: var(--color-surface-dark, #0D2B4E);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  border-left: var(--faq-line-width, 3px) solid var(--color-accent-cyan, #00E5FF);
}

.page-faq__aside-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 1rem);
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: var(--text-lg, 1.563rem);
  font-weight: 700;
  color: var(--color-text-primary, #E0E6ED);
  margin: 0;
  letter-spacing: 0.02em;
}
.page-faq__aside-title .section-label {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-accent-cyan, #00E5FF);
  opacity: 0.7;
  font-weight: 400;
  letter-spacing: 0.1em;
}

/* 帮助中心步骤条 */
.help-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding: var(--space-xs, 0.625rem) 0;
}

.help-steps__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 1rem);
  position: relative;
  padding: var(--space-xs, 0.625rem) 0;
  min-height: 3rem;
}

.help-steps__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--faq-step-size, 2.25rem);
  height: var(--faq-step-size, 2.25rem);
  border-radius: 50%;
  background: var(--color-surface-medium, #152C4A);
  color: var(--color-text-secondary, #8A9BAE);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: calc(var(--faq-step-size, 2.25rem) * 0.45);
  font-weight: 700;
  flex-shrink: 0;
  border: 2px solid var(--color-text-secondary, #8A9BAE);
  transition: all 0.3s ease;
  z-index: 2;
}

.help-steps__label {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  font-weight: 400;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.help-steps__line {
  position: absolute;
  left: calc(var(--faq-step-size, 2.25rem) / 2);
  top: calc(var(--faq-step-size, 2.25rem) + 0.5rem);
  width: var(--faq-line-width, 3px);
  height: calc(100% - var(--faq-step-size, 2.25rem) - 0.25rem);
  background: var(--color-surface-medium, #152C4A);
  transform: translateX(-50%);
  z-index: 1;
}

.help-steps__item:last-child .help-steps__line {
  display: none;
}

/* 当前步骤高亮 */
.help-steps__item--current .help-steps__num {
  background: var(--color-accent-gold, #FFD700);
  color: var(--color-base-dark, #0A1F3F);
  border-color: var(--color-accent-gold, #FFD700);
  box-shadow: var(--faq-glow-gold, 0 0 16px rgba(255, 215, 0, 0.4));
  transform: scale(1.08);
}

.help-steps__item--current .help-steps__label {
  color: var(--color-accent-gold, #FFD700);
  font-weight: 600;
}

.help-steps__glow {
  position: absolute;
  left: calc(var(--faq-step-size, 2.25rem) / 2);
  top: calc(var(--faq-step-size, 2.25rem) / 2);
  width: calc(var(--faq-step-size, 2.25rem) * 1.8);
  height: calc(var(--faq-step-size, 2.25rem) * 1.8);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.15) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: faq-pulse-glow 2s ease-in-out infinite;
  z-index: 0;
}

@keyframes faq-pulse-glow {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.12); }
}

/* 步骤示意图 */
.page-faq__figure {
  margin: var(--space-xs, 0.625rem) 0 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs, 0.625rem);
}
.page-faq__steps-img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  display: block;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  border: 1px solid rgba(0, 229, 255, 0.15);
}
.page-faq__figcaption {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  font-style: normal;
  padding-left: var(--space-xs, 0.625rem);
  border-left: 2px solid var(--color-accent-gold, #FFD700);
}

.page-faq__aside-note {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  line-height: 1.6;
  margin: 0;
  padding-top: var(--space-xs, 0.625rem);
  border-top: 1px solid rgba(255, 215, 0, 0.15);
}

/* 主内容区 */
.page-faq__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1.5rem);
  min-width: 0;
}

.page-faq__title {
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: var(--text-2xl, 2.441rem);
  font-weight: 800;
  color: var(--color-text-primary, #E0E6ED);
  margin: 0;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.page-faq__title::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  margin-top: var(--space-sm, 1rem);
  background: linear-gradient(90deg, var(--color-accent-gold, #FFD700), var(--color-accent-cyan, #00E5FF));
  border-radius: 2px;
}

.page-faq__subtitle {
  font-size: var(--text-md, 1.25rem);
  color: var(--color-text-secondary, #8A9BAE);
  margin: 0;
  line-height: 1.5;
  max-width: 36em;
}

/* 问答列表 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 1rem);
}

/* 单个问答项 */
.faq-item {
  background: var(--color-surface-dark, #0D2B4E);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  border: 1px solid rgba(0, 229, 255, 0.1);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.faq-item:hover {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--faq-glow-cyan, 0 0 14px rgba(0, 229, 255, 0.1));
}

.faq-item__heading {
  margin: 0;
  font-size: inherit;
}

.faq-item__toggle {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 1rem);
  width: 100%;
  padding: var(--space-sm, 1rem) var(--space-md, 1.5rem);
  background: transparent;
  border: none;
  color: var(--color-text-primary, #E0E6ED);
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  font-size: var(--text-base, 1rem);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s ease;
  -webkit-appearance: none;
  appearance: none;
}
.faq-item__toggle:hover,
.faq-item__toggle:focus-visible {
  background: rgba(0, 229, 255, 0.05);
  outline: none;
}
.faq-item__toggle:focus-visible {
  box-shadow: inset 0 0 0 2px var(--color-accent-cyan, #00E5FF);
}

.faq-item__icon {
  width: var(--faq-icon-size, 2.5rem);
  height: var(--faq-icon-size, 2.5rem);
  border-radius: 50%;
  flex-shrink: 0;
  object-fit: cover;
  display: block;
  background: var(--color-surface-medium, #152C4A);
  border: 1px solid rgba(0, 229, 255, 0.2);
  transition: border-color 0.2s ease;
}
.faq-item__toggle:hover .faq-item__icon {
  border-color: var(--color-accent-gold, #FFD700);
}

.faq-item__question {
  flex: 1;
  min-width: 0;
  line-height: 1.4;
}

.faq-item__indicator {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.12);
  color: var(--color-accent-cyan, #00E5FF);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-lg, 1.563rem);
  font-weight: 300;
  transition: transform 0.35s var(--ease-elastic, cubic-bezier(0.34, 1.56, 0.64, 1)),
              background 0.3s ease,
              color 0.3s ease;
}

/* 展开状态 */
.faq-item[data-expanded="true"] .faq-item__indicator {
  transform: rotate(45deg);
  background: var(--color-accent-gold, #FFD700);
  color: var(--color-base-dark, #0A1F3F);
}

/* 答案体 */
.faq-item__body {
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease, opacity 0.3s ease;
  max-height: 0;
  padding: 0 var(--space-md, 1.5rem);
  opacity: 0;
}
.faq-item[data-expanded="true"] .faq-item__body {
  max-height: 30rem;
  padding: 0 var(--space-md, 1.5rem) var(--space-md, 1.5rem);
  opacity: 1;
}
.faq-item__body p {
  margin: 0;
  line-height: 1.7;
  color: var(--color-text-secondary, #8A9BAE);
  font-size: var(--text-base, 1rem);
}
.faq-item__body strong {
  color: var(--color-accent-cyan, #00E5FF);
  font-weight: 600;
}

/* 链接 */
.page-faq__link {
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
  font-weight: 500;
}
.page-faq__link:hover,
.page-faq__link:focus-visible {
  color: var(--color-accent-gold, #FFD700);
  border-bottom-color: var(--color-accent-gold, #FFD700);
  outline: none;
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-faq {
    padding: var(--space-lg, 2.5rem) 0 var(--space-xl, 4rem) 0;
  }
  .page-faq__container {
    padding: 0 var(--space-md, 1.5rem);
  }
  .page-faq__grid {
    display: grid;
    grid-template-columns: var(--faq-aside-width, 280px) 1fr;
    gap: var(--space-lg, 2.5rem);
    align-items: start;
  }
  .page-faq__aside {
    padding: var(--space-md, 1.5rem);
    position: sticky;
    top: calc(var(--header-height, 56px) + var(--space-md, 1.5rem));
  }
  .page-faq__title {
    font-size: var(--text-3xl, 3.052rem);
  }
  .faq-item__toggle {
    padding: var(--space-sm, 1rem) var(--space-md, 1.5rem);
    font-size: var(--text-md, 1.25rem);
  }
  .faq-item__body p {
    font-size: var(--text-base, 1rem);
  }
}

/* ===== 大桌面端（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-faq__container {
    padding: 0 var(--space-lg, 2.5rem);
  }
  .page-faq__grid {
    grid-template-columns: 300px 1fr;
    gap: var(--space-xl, 4rem);
  }
  .page-faq__aside {
    padding: var(--space-lg, 2.5rem) var(--space-md, 1.5rem);
  }
  .page-faq__title {
    font-size: 3.5rem;
  }
  .faq-list {
    gap: var(--space-md, 1.5rem);
  }
}

/* ===== 移动端窄屏安全 ===== */
@media (max-width: 380px) {
  .page-faq__container {
    padding: 0 var(--space-xs, 0.625rem);
  }
  .page-faq__aside {
    padding: var(--space-sm, 1rem);
  }
  .faq-item__toggle {
    padding: var(--space-xs, 0.625rem) var(--space-sm, 1rem);
    flex-wrap: wrap;
  }
  .faq-item__question {
    min-width: 12ch;
  }
  .faq-item__icon {
    width: 2rem;
    height: 2rem;
  }
  .help-steps__num {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.875rem;
  }
  .help-steps__label {
    font-size: 0.75rem;
  }
}

/* 确保无 JS 时所有内容可见（渐进增强） */
.page-faq .faq-item[data-expanded] .faq-item__body {
  max-height: 30rem;
  padding: 0 var(--space-md, 1.5rem) var(--space-md, 1.5rem);
  opacity: 1;
}
/* 如果 JS 可用，由脚本控制显隐；这里提供默认安全状态 */
.page-faq .faq-item[data-expanded="false"] .faq-item__body {
  max-height: 0;
  padding: 0 var(--space-md, 1.5rem);
  opacity: 0;
  overflow: hidden;
}
.page-faq .faq-item[data-expanded="false"] .faq-item__indicator {
  transform: rotate(0deg);
  background: rgba(0, 229, 255, 0.12);
  color: var(--color-accent-cyan, #00E5FF);
}