/* ===== 项目介绍页 ===== */
.about-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 48px;
  color: var(--cls-color-text);
  line-height: var(--cls-line-height);
}

/* --- 返回按钮 --- */
.about-back-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--cls-color-bg-white);
  border: 1px solid var(--cls-color-border);
  border-radius: var(--cls-radius-btn);
  color: var(--cls-color-text);
  font-size: var(--cls-font-size-base);
  cursor: pointer;
  box-shadow: var(--cls-shadow-sm);
  transition: background var(--cls-transition), box-shadow var(--cls-transition);
}

.about-back-btn:hover {
  background: var(--cls-color-primary-bg);
  box-shadow: var(--cls-shadow-md);
}

/* --- 愿景英雄区 --- */
.about-hero {
  text-align: center;
  padding: 56px 24px 48px;
  margin-bottom: 40px;
  background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 50%, #E8F5E9 100%);
  border-radius: var(--cls-radius-lg);
  position: relative;
  overflow: hidden;
}

.about-hero::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 180px;
  height: 180px;
  background: rgba(25, 118, 210, 0.06);
  border-radius: 50%;
}

.about-hero::after {
  content: '';
  position: absolute;
  bottom: -30px;
  left: -30px;
  width: 140px;
  height: 140px;
  background: rgba(46, 125, 50, 0.06);
  border-radius: 50%;
}

.about-hero-badge {
  display: inline-block;
  padding: 6px 20px;
  background: var(--cls-color-bg-white);
  color: var(--cls-color-primary);
  font-size: var(--cls-font-size-sm);
  font-weight: var(--cls-font-weight-medium);
  border-radius: var(--cls-radius-full);
  margin-bottom: 20px;
  box-shadow: var(--cls-shadow-sm);
  position: relative;
  z-index: 1;
}

.about-hero-title {
  font-size: 36px;
  font-weight: var(--cls-font-weight-bold);
  color: var(--cls-color-primary-dark);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
  line-height: 1.3;
}

.about-hero-subtitle {
  font-size: var(--cls-font-size-lg);
  color: var(--cls-color-text-light);
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

/* --- 通用段落标题 --- */
.about-section {
  margin-bottom: 48px;
}

.about-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.about-section-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--cls-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.about-section-icon.blue {
  background: var(--cls-color-primary-bg);
}

.about-section-icon.green {
  background: var(--cls-color-success-bg);
}

.about-section-icon.amber {
  background: var(--cls-color-warning-bg);
}

.about-section-icon.purple {
  background: #F3E5F5;
}

.about-section-title {
  font-size: var(--cls-font-size-xl);
  font-weight: var(--cls-font-weight-bold);
  color: var(--cls-color-text);
}

.about-section-desc {
  font-size: var(--cls-font-size-base);
  color: var(--cls-color-text-light);
  margin-top: -16px;
  margin-bottom: 24px;
  padding-left: 52px;
}

/* --- 功能卡片网格 --- */
.about-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.about-feature-card {
  background: var(--cls-color-bg-card);
  border: 1px solid var(--cls-color-border-light);
  border-radius: var(--cls-radius-md);
  padding: 20px;
  transition: box-shadow var(--cls-transition), transform var(--cls-transition);
}

.about-feature-card:hover {
  box-shadow: var(--cls-shadow-md);
  transform: translateY(-2px);
}

.about-feature-card-icon {
  font-size: 28px;
  margin-bottom: 12px;
}

.about-feature-card-title {
  font-size: var(--cls-font-size-md);
  font-weight: var(--cls-font-weight-medium);
  margin-bottom: 8px;
  color: var(--cls-color-text);
}

.about-feature-card-desc {
  font-size: var(--cls-font-size-sm);
  color: var(--cls-color-text-light);
  line-height: 1.6;
}

/* --- 截图占位区 --- */
.about-screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.about-screenshot-item {
  border-radius: var(--cls-radius-md);
  overflow: hidden;
  border: 1px solid var(--cls-color-border-light);
  background: var(--cls-color-bg-card);
  transition: box-shadow var(--cls-transition);
}

.about-screenshot-item:hover {
  box-shadow: var(--cls-shadow-md);
}

.about-screenshot-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

.about-screenshot-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #F5F5F5 0%, #EEEEEE 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--cls-color-text-disabled);
  gap: 8px;
}

.about-screenshot-placeholder-icon {
  font-size: 36px;
  opacity: 0.5;
}

.about-screenshot-placeholder-text {
  font-size: var(--cls-font-size-sm);
}

.about-screenshot-caption {
  padding: 12px 16px;
  font-size: var(--cls-font-size-sm);
  color: var(--cls-color-text-light);
  text-align: center;
  border-top: 1px solid var(--cls-color-border-light);
}

/* --- 理念标签 --- */
.about-value-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-left: 52px;
}

.about-value-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--cls-color-bg-card);
  border: 1px solid var(--cls-color-border-light);
  border-radius: var(--cls-radius-full);
  font-size: var(--cls-font-size-base);
  color: var(--cls-color-text);
  transition: border-color var(--cls-transition), background var(--cls-transition);
}

.about-value-tag:hover {
  border-color: var(--cls-color-primary-light);
  background: var(--cls-color-primary-bg);
}

.about-value-tag-icon {
  font-size: 18px;
}

/* --- 底部 --- */
.about-footer {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--cls-color-divider);
  color: var(--cls-color-text-light);
  font-size: var(--cls-font-size-sm);
}

.about-footer-heart {
  color: #E91E63;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .about-page {
    padding: 0 16px 32px;
  }

  .about-hero {
    padding: 40px 16px 36px;
  }

  .about-hero-title {
    font-size: 26px;
  }

  .about-hero-subtitle {
    font-size: var(--cls-font-size-md);
  }

  .about-section-desc,
  .about-value-tags {
    padding-left: 0;
  }

  .about-feature-grid {
    grid-template-columns: 1fr;
  }

  .about-screenshot-grid {
    grid-template-columns: 1fr;
  }
}