.page-faq {
  --faq-line: 2px solid var(--c-border);
  background: var(--c-bg);
  overflow-x: hidden;
}

/* ===== 页头区 ===== */
.faq-hero {
  position: relative;
  isolation: isolate;
  padding-top: 40px;
  padding-bottom: 48px;
  border-bottom: 2px solid var(--c-border);
}

.faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 255, 135, 0.05);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 58% 100%, 0 70%);
  pointer-events: none;
  z-index: -1;
}

.faq-hero .container {
  position: relative;
}

.faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
  margin-top: 32px;
}

.faq-kicker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--c-green);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.faq-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  color: var(--c-text);
  margin-bottom: 16px;
}

.faq-lead {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 52ch;
  line-height: 1.7;
  margin: 0;
}

.faq-hero-icon {
  justify-self: center;
  border: var(--faq-line);
  box-shadow: var(--shadow);
  padding: 12px;
  background: var(--c-panel);
}

.faq-hero-icon img {
  display: block;
  width: 100%;
  max-width: 200px;
  height: auto;
  object-fit: cover;
}

/* ===== 快速分类索引 ===== */
.faq-index {
  padding-top: 56px;
  padding-bottom: 16px;
}

.faq-index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.faq-index-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px;
  background: var(--c-panel);
  border: var(--faq-line);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--c-text);
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.faq-index-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-green);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.faq-index-card:hover,
.faq-index-card:focus-visible {
  border-color: var(--c-green);
  transform: translateY(-3px);
}

.faq-index-card:hover::before,
.faq-index-card:focus-visible::before {
  opacity: 1;
}

.faq-index-num {
  font-family: var(--font-mono);
  color: var(--c-green);
  font-size: 0.9rem;
}

.faq-index-name {
  font-family: var(--font-head);
  font-size: 1.25rem;
}

.faq-index-desc {
  font-size: 0.875rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.faq-index-arrow {
  align-self: flex-end;
  color: var(--c-blue);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  margin-top: 6px;
}

/* ===== 分类区块 ===== */
.faq-category {
  padding-top: 56px;
  padding-bottom: 24px;
  border-top: 2px solid var(--c-border);
}

.faq-category-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
}

.faq-category-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-blue);
  letter-spacing: 0.02em;
}

.page-faq #faq-replay .faq-category-num,
.page-faq #faq-feedback .faq-category-num {
  color: var(--c-green);
}

.faq-category-head .section-title {
  margin: 0;
}

/* ===== 手风琴列表 ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--c-panel);
  border: var(--faq-line);
  box-shadow: var(--shadow);
}

.faq-item[open] {
  border-color: var(--c-green);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-item summary:hover {
  background: var(--c-blue-soft);
}

.faq-question {
  font-family: var(--font-head);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--c-text);
}

.faq-toggle {
  flex: 0 0 26px;
  width: 26px;
  height: 26px;
  border: 2px solid var(--c-green);
  position: relative;
  transition: background 0.2s ease;
}

.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 2px;
  background: var(--c-green);
  transform: translate(-50%, -50%);
}

.faq-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-toggle::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-item[open] .faq-toggle {
  background: var(--c-green-soft);
}

.faq-answer {
  padding: 0 18px 22px;
  border-top: 1px dashed var(--c-border);
}

.faq-answer p {
  margin-top: 14px;
  color: var(--c-muted);
  line-height: 1.7;
  font-size: 0.95rem;
}

.faq-answer a {
  color: var(--c-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== 订阅双栏 ===== */
.faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.faq-subscribe-aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}

.faq-subscribe-aside img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border: var(--faq-line);
  box-shadow: var(--shadow);
  background: var(--c-panel);
}

.faq-subscribe-note {
  border-left: 4px solid var(--c-green);
  background: var(--c-green-soft);
  padding: 14px 16px;
  max-width: 300px;
}

.faq-subscribe-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  margin-right: 8px;
  animation: faq-pulse 2.4s ease-in-out infinite;
}

@keyframes faq-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(0, 255, 135, 0.6);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(0, 255, 135, 0);
  }
}

.faq-subscribe-note p {
  margin: 4px 0 0;
  font-size: 0.875rem;
  color: var(--c-text);
  line-height: 1.5;
}

.faq-subscribe-note .text-muted {
  margin-top: 8px;
}

/* ===== 底部更多帮助 ===== */
.faq-more {
  padding-top: 64px;
  padding-bottom: 80px;
  border-top: 2px solid var(--c-border);
}

.faq-more-panel {
  background: var(--c-panel);
  border: 2px solid var(--c-blue);
  box-shadow: var(--shadow);
  padding: 40px 24px;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.faq-more-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--c-blue);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.faq-more-panel h2 {
  font-family: var(--font-head);
  font-size: 1.8rem;
  color: var(--c-text);
  margin-bottom: 12px;
}

.faq-more-panel > p:not(.faq-more-kicker) {
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.faq-more-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .faq-hero {
    padding-top: 64px;
    padding-bottom: 72px;
  }

  .faq-hero-grid {
    grid-template-columns: 1fr 240px;
    gap: 48px;
    margin-top: 40px;
  }

  .faq-hero-icon {
    justify-self: end;
  }

  .faq-index-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .faq-index-card {
    padding: 28px 24px;
    min-height: 170px;
  }

  .faq-category {
    padding-top: 72px;
    padding-bottom: 32px;
  }

  .faq-item summary {
    padding: 24px 28px;
  }

  .faq-answer {
    padding: 0 28px 28px;
  }

  .faq-question {
    font-size: 1.15rem;
  }

  .faq-split {
    grid-template-columns: 1fr 340px;
    gap: 40px;
    align-items: start;
  }

  .faq-subscribe-aside {
    position: sticky;
    top: 24px;
  }

  .faq-more-panel {
    padding: 56px 48px;
  }

  .faq-more-panel h2 {
    font-size: 2.2rem;
  }
}