:root { --navbar-height: 80px; --primary: #00796b; }

body {
  background: linear-gradient(135deg, #e0f7fa, #e8f5e9);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  padding-top: 120px !important;        /* 关键：原来80px → 120px，拉开呼吸感 */
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
}

.navbar { position: fixed; top: 0; width: 100%; z-index: 1100; }

.content-area {
  padding: 20px 20px 40px 20px;
}

#home {
  margin-top: -20px;
}

footer {
  flex-shrink: 0;              /* 关键3：footer 不被压缩 */
  margin-top: auto;            /* 自动推到底部 */
  width: 100%;
}






.page-content { display: none; }
.page-content.active { display: block; animation: fadeIn 0.5s ease; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }

/* ============ 主页专属样式 ============ */
.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  color: #004d40;
  text-align: center;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: #00695c;
  text-align: center;
  margin-bottom: 4rem;
}

/* ============ 四大特色 - 极简无卡片版（文字高度完全一致） ============ */
.feature-simple {
  height: 180px;                    /* 统一高度，确保文字对齐 */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px 10px;
  transition: all 0.4s ease;
}

.feature-simple:hover {
  transform: translateY(-8px);
  border-radius: 20px;
  backdrop-filter: blur(8px);
}

.feature-simple-img {
  width: 86px;
  height: 86px;
  object-fit: contain;
  margin-bottom: 18px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.12));
  transition: all 0.4s ease;
}

.feature-simple:hover .feature-simple-img {
  transform: scale(1.25) rotate(10deg);
  filter: drop-shadow(0 10px 25px rgba(0, 121, 107, 0.25));
}

.feature-simple-title {
  margin: 0 0 8px 0 !important;
  font-weight: 700;
  color: #004d40;
  font-size: 1.25rem;
}

.feature-simple-desc {
  margin: 0;
  color: #00695c;
  font-size: 0.98rem;
  line-height: 1.5;
  font-weight: 500;
}

/* 手机端适配 */
@media (max-width: 768px) {
  .feature-simple {
    height: 160px;
    padding: 15px 8px;
  }

  .feature-simple-img {
    width: 70px;
    height: 70px;
    margin-bottom: 14px;
  }

  .feature-simple-title { font-size: 1.15rem; }
  .feature-simple-desc { font-size: 0.9rem; }
}

/* 三大核心功能卡片 */
.function-card {
  background: rgba(255,255,255,0.97);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(0,0,0,0.12);
  transition: all 0.4s ease;
  height: 100%;
  border: 2px solid transparent;
}

.function-card:hover {
  transform: translateY(-15px);
  box-shadow: 0 30px 60px rgba(0,0,0,0.2);
}

.function-card.main {
  border-color: var(--success) !important;
  box-shadow: 0 20px 50px rgba(0, 121, 107, 0.2);
}

.function-card img {
  height: 40px !important;      /* 我测试后最舒服的高度 */
  /* height: 180px !important;   也可以 */
  object-fit: cover;
  border-radius: 24px 24px 0 0;
}

.function-body {
  padding: 2rem;
  text-align: center;
}

.function-body h3 {
  font-size: 1.6rem;
  color: #004d40;
  margin-bottom: 1rem;
}

.function-body p {
  color: #555;
  margin-bottom: 1.5rem;

}