/* dao_index.css - 道频道专属样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "STKaiti", "KaiTi", "PingFang SC", "Microsoft YaHei", serif;
  background: linear-gradient(135deg, #f0f4f3 0%, #e1eae8 100%);
  color: #2c3e50;
  line-height: 1.7;
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

/* === Hero 区域 === */
.hero {
  margin: 50px 0 30px;
}

.hero h1 {
  font-size: 3.4rem;
  font-weight: 300;
  letter-spacing: 3px;
  color: #1a3a3a;
  margin-bottom: 16px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.slogan {
  font-size: 1.7rem;
  color: #27ae60;
  font-family: "STKaiti", "KaiTi", serif;
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.subtitle {
  font-size: 1.1rem;
  color: #555;
  font-style: italic;
}

/* === 德道关系 === */
.essence {
  margin: 30px 0;
  font-size: 1.25rem;
  color: #2c3e50;
  line-height: 1.8;
  font-family: "STKaiti", "KaiTi", serif;
}

/* === 三大原则 === */
.principles {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin: 50px 0;
}

.principle {
  background: white;
  border-radius: 14px;
  padding: 24px;
  width: 220px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  transition: transform 0.25s;
}

.principle:hover {
  transform: translateY(-4px);
}

.principle h2 {
  font-size: 1.3rem;
  color: #27ae60;
  margin-bottom: 12px;
  font-weight: 600;
}

.principle p {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.6;
}

/* === 按钮 === */
.action .btn {
  display: inline-block;
  background: #27ae60;
  color: white;
  text-decoration: none;
  padding: 12px 36px;
  border-radius: 30px;
  font-size: 1.15rem;
  transition: background 0.3s;
  margin-bottom: 20px;
  font-family: "PingFang SC", sans-serif;
}

.action .btn:hover {
  background: #219653;
}

.back-home a {
  color: #7f8c8d;
  text-decoration: none;
  font-size: 0.95rem;
}

.back-home a:hover {
  text-decoration: underline;
}

/* === 备案信息 === */
.beian-footer {
  margin-top: 60px;
  padding-top: 25px;
  border-top: 1px solid #d5e5e0;
  font-size: 0.85rem;
  color: #7f8c8d;
}

.beian-footer a {
  color: #7f8c8d;
  text-decoration: none;
}

.beian-footer a:hover {
  text-decoration: underline;
}

.beian-footer img {
  height: 14px;
  vertical-align: middle;
}

/* === 响应式 === */
@media (max-width: 600px) {
  .hero h1 { font-size: 2.5rem; }
  .slogan { font-size: 1.4rem; }
  .principles { gap: 16px; }
  .principle { width: 100%; max-width: 280px; }
}