/* ===== 页面专属：帮助中心 ===== */
.page-faq {
  --faq-gap: 20px;
  --faq-text-dark: #0B1B2B;
  --faq-text-deep: #35404E;
  --faq-paper-line: rgba(11, 27, 43, 0.16);
  --faq-dark-line: rgba(255, 255, 255, 0.14);
  padding: 24px 0 56px;
}

.page-faq .faq-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
}

/* ===== 顶部横幅与面包屑 ===== */
.page-faq .faq-intro {
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 22px 18px 24px;
}
.page-faq .faq-intro::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 56%;
  height: 100%;
  background: repeating-linear-gradient(
    135deg,
    transparent 0 14px,
    rgba(0, 168, 255, 0.1) 14px 15px,
    transparent 15px 30px
  );
  pointer-events: none;
}
.page-faq .faq-intro .breadcrumb {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 18px;
}
.page-faq .breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}
.page-faq .breadcrumb a:hover {
  text-decoration: underline;
}
.page-faq .breadcrumb .breadcrumb-sep {
  margin-inline: 6px;
  color: var(--text-muted);
}
.page-faq .faq-heading {
  position: relative;
  z-index: 1;
  max-width: 720px;
}
.page-faq .faq-heading h1 {
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1.08;
  color: var(--text);
  letter-spacing: 0.01em;
  margin: 0 0 10px;
}
.page-faq .faq-lead {
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--primary);
  font-weight: 700;
  margin: 0 0 10px;
}
.page-faq .faq-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-sub);
}

/* ===== 搜索条 ===== */
.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--bg-deep);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.page-faq .faq-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 168, 255, 0.16);
}
.page-faq .faq-search-icon {
  flex: 0 0 auto;
  display: inline-flex;
  color: var(--primary);
}
.page-faq .faq-search-input {
  flex: 1 1 auto;
  min-width: 0;
  background: transparent;
  border: 0;
  outline: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 6px 0;
}
.page-faq .faq-search-input::placeholder {
  color: var(--text-muted);
}
.page-faq .faq-search-hint {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  background: rgba(0, 168, 255, 0.1);
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  white-space: nowrap;
}

/* ===== 双栏布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

/* ===== 左侧索引卡 ===== */
.page-faq .faq-nav-card {
  background: var(--bg-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 16px;
}
.page-faq .faq-nav-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 12px;
  margin-bottom: 12px;
}
.page-faq .faq-nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.page-faq .faq-nav-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}
.page-faq .faq-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 10px;
  margin-block: 4px;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
  transition: background 0.16s ease, border-color 0.16s ease;
}
.page-faq .faq-nav-link:hover {
  background: rgba(0, 168, 255, 0.1);
  border-color: rgba(0, 168, 255, 0.45);
}
.page-faq .faq-nav-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 8px;
}
.page-faq .faq-nav-name {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}
.page-faq .faq-nav-state {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.22);
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-sub);
}
.page-faq .faq-nav-state .status-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.18);
}
.page-faq .faq-nav-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ===== 右侧答案面板 ===== */
.page-faq .faq-panels {
  display: grid;
  gap: 20px;
}
.page-faq .faq-panel {
  background: var(--bg-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 18px 16px 14px;
}
.page-faq .faq-panel-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.page-faq .faq-panel-head .section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 6px;
  padding: 3px 8px;
}
.page-faq .faq-panel-head h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin: 0;
}

/* ===== 答案卡片：暖纸 / 深色 ===== */
.page-faq .faq-answer-card {
  border-radius: 10px;
  padding: 4px 16px;
  overflow: hidden;
}
.page-faq .faq-answer-card--paper {
  background: var(--paper);
  border: 1px solid var(--faq-paper-line);
}
.page-faq .faq-answer-card--dark {
  background:
    repeating-linear-gradient(
      -45deg,
      transparent 0 12px,
      rgba(255, 255, 255, 0.03) 12px 13px
    ),
    var(--bg-deep);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
}

/* details 折叠面板 */
.page-faq .faq-answer-card details {
  border-bottom: 1px solid var(--faq-paper-line);
}
.page-faq .faq-answer-card details:last-child {
  border-bottom: 0;
}
.page-faq .faq-answer-card--dark details {
  border-bottom: 1px solid var(--faq-dark-line);
}
.page-faq .faq-answer-card--dark details:last-child {
  border-bottom: 0;
}
.page-faq summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 16px 34px 16px 0;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.55;
  display: block;
}
.page-faq summary::-webkit-details-marker {
  display: none;
}
.page-faq summary::after {
  content: "+";
  position: absolute;
  top: 15px;
  right: 0;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.22s ease;
}
.page-faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}
.page-faq .faq-answer-card--paper summary {
  color: var(--faq-text-dark);
}
.page-faq .faq-answer-card--dark summary {
  color: var(--text);
}
.page-faq .faq-answer-card--dark summary::after {
  border-color: rgba(255, 255, 255, 0.5);
}

/* 答案正文 */
.page-faq .faq-answer-body {
  padding: 0 10px 16px 0;
  font-size: 14px;
  line-height: 1.8;
}
.page-faq .faq-answer-card--paper .faq-answer-body {
  color: var(--faq-text-deep);
}
.page-faq .faq-answer-card--dark .faq-answer-body {
  color: var(--text-sub);
}

/* ===== 同步示意图 ===== */
.page-faq .faq-sync-visual {
  margin: 14px 0 4px;
}
.page-faq .faq-sync-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--faq-paper-line);
  border-radius: 10px;
}
.page-faq .faq-sync-visual figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faq-text-deep);
  margin-top: 6px;
  opacity: 0.85;
}

/* ===== 联系横条 ===== */
.page-faq .faq-contact-strip {
  position: relative;
  overflow: hidden;
  padding: 22px 18px;
  background: linear-gradient(135deg, #002B4A 0%, #0B1B2B 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-faq .faq-contact-strip::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--highlight));
}
.page-faq .faq-contact-text h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 8px;
}
.page-faq .faq-contact-text p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
  margin: 0;
}
.page-faq .faq-contact-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
}
.page-faq .faq-email {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-sub);
}

/* ===== 底部抽象视觉 ===== */
.page-faq .faq-bottom-visual {
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-faq .faq-bottom-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 响应式：平板 ===== */
@media (min-width: 768px) {
  .page-faq {
    padding-top: 32px;
  }
  .page-faq .faq-intro {
    padding: 30px 26px 28px;
  }
  .page-faq .faq-heading h1 {
    font-size: 42px;
  }
  .page-faq .faq-contact-strip {
    padding: 26px 24px;
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 1024px) {
  .page-faq {
    padding: 44px 0 72px;
  }
  .page-faq .faq-wrap {
    gap: 24px;
  }
  .page-faq .faq-layout {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 26px;
  }
  .page-faq .faq-nav-panel {
    position: sticky;
    top: 110px;
  }
  .page-faq .faq-nav-card {
    padding: 18px;
  }
  .page-faq .faq-panel {
    padding: 22px 20px 18px;
  }
  .page-faq .faq-contact-strip {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 28px 32px;
  }
  .page-faq .faq-contact-text h2 {
    font-size: 26px;
  }
}