/* ===== 知识沉淀页 - Hero ===== */

.know-hero {
  padding: 72px 0 40px;
  background: linear-gradient(180deg, #f0f4ff 0%, #ffffff 100%);
  text-align: center;
}

.know-title {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text);
}

.know-desc {
  max-width: 720px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-light);
}


/* ===== 竖向 Tab 布局 ===== */

.know-tabs-section {
  padding: 48px 0 80px;
  background: var(--white);
}

.know-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

.know-tabs {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-right: 2px solid var(--line);
  position: sticky;
  top: 100px;
}

.know-tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 24px 20px 20px;
  font-size: 15px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  position: relative;
  transition: background 0.2s;
  border-radius: 12px 0 0 12px;
}

.know-tab::after {
  content: "";
  position: absolute;
  top: 0;
  right: -2px;
  bottom: 0;
  width: 3px;
  background: transparent;
  border-radius: 3px 0 0 3px;
  transition: background 0.25s;
}

.know-tab:hover {
  background: var(--bg);
}

.know-tab.is-active {
  background: var(--bg);
}

.know-tab.is-active::after {
  background: var(--primary);
}


/* ===== Tab 内部元素 ===== */

.know-tab-icon {
  flex-shrink: 0;
  width: 1em;
  height: 1em;
  min-width: 1em;
  border-radius: 4px;
  background: #eef1fb;
  display: grid;
  place-items: center;
  color: var(--text-light);
  transition: background 0.2s, color 0.2s;
}

.know-tab-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.know-tab.is-active .know-tab-icon {
  background: var(--primary);
  color: var(--white);
}

.know-tab-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.know-tab-name {
  font-size: 1em;
  font-weight: normal;
  color: var(--text-light);
  transition: color 0.2s;
}

.know-tab.is-active .know-tab-name {
  color: var(--text);
}

.know-tab-quote {
  font-size: 12px;
  line-height: 1.45;
  color: #a0a7b5;
  word-wrap: break-word;
  overflow-wrap: break-word;
  transition: color 0.2s;
}

.know-tab.is-active .know-tab-quote {
  color: var(--primary);
}


/* ===== 面板 ===== */

.know-panels {
  position: relative;
  overflow: hidden;
  min-height: 420px;
}

.know-panel {
  display: none;
  animation: knowFadeIn 0.35s ease;
}

.know-panel.is-active {
  display: block;
}

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

.know-panel-inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.know-panel-content {
  padding: 0 8px;
}

.know-panel-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.know-panel-tagline {
  font-size: 15px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 20px;
  font-style: italic;
}

.know-panel-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.know-panel-body p {
  font-size: 15px;
  line-height: 1.75;
  color: #3c4257;
}


/* ===== 图片占位 ===== */

.know-panel-visual {
  border-radius: var(--radius);
  overflow: hidden;
}

.know-img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 320px;
  background: linear-gradient(135deg, #f5f7ff 0%, #eef1fb 100%);
  border: 2px dashed #c5ccdb;
  border-radius: var(--radius);
  color: #9da7bb;
  font-size: 14px;
}

.know-img-placeholder svg {
  opacity: 0.5;
}


/* ===== 响应式 ===== */

@media (max-width: 980px) {
  .know-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .know-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    border-right: none;
    border-bottom: none;
    position: static;
  }

  .know-tab {
    flex: 1 1 calc(33.333% - 8px);
    min-width: 0;
    flex-direction: column;
    text-align: center;
    padding: 16px 12px;
    border-radius: 12px;
  }

  .know-tab::after {
    top: 0;
    right: auto;
    bottom: 0;
    left: 0;
    width: auto;
    height: 2px;
    border-radius: 3px 3px 0 0;
  }

  .know-tab-text {
    align-items: center;
  }

  .know-panels {
    min-height: auto;
    padding-top: 24px;
  }
}

@media (max-width: 640px) {
  .know-hero {
    padding: 48px 0 28px;
  }

  .know-desc {
    font-size: 15px;
  }

  .know-tab {
    flex: 1 1 calc(50% - 8px);
    padding: 12px 10px;
    font-size: 13px;
  }

  .know-tab-quote {
    font-size: 11px;
  }

  .know-panel-title {
    font-size: 22px;
  }

  .know-panel-body p {
    font-size: 14px;
  }

  .know-img-placeholder {
    min-height: 220px;
  }
}

.know-panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
  align-items: center;
}

.know-panel-actions .know-panel-cta {
  margin-top: 0;
}

.know-panel-cta {
  display: inline-flex;
  align-items: center;
  margin-top: 28px;
  min-height: 44px;
  padding: 0 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
}

.know-panel-more {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
}

.know-panel-more:hover {
  border-color: var(--primary);
  color: var(--primary);
}

@media (max-width: 420px) {
  .know-tab {
    flex: 1 1 100%;
  }
}