/* ===================================
   田园中的 AI - 博客样式
   配色：柔和白、木炭灰、柔和金
   =================================== */

/* CSS 变量定义 */
:root {
  --soft-white: #F8F6F4;
  --charcoal: #2C2C2C;
  --soft-gold: #D4AF37;
  --gold-light: #E5C558;
  --gray-light: #E8E6E3;
  --gray-medium: #8C8C8C;
  --transition: all 0.3s ease;
}

/* 系统字体栈 */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.8;
  color: var(--charcoal);
  background-color: var(--soft-white);
  margin: 0;
  padding: 0;
}

/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

a:hover {
  color: var(--soft-gold);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 导航栏 */
.navbar {
  background-color: var(--soft-white);
  padding: 1.5rem 3rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--charcoal);
  letter-spacing: 2px;
}

.navbar .logo span {
  color: var(--soft-gold);
}

.navbar .nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.navbar .nav-links a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--charcoal);
  position: relative;
  padding-bottom: 0.3rem;
}

.navbar .nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--soft-gold);
  transition: var(--transition);
}

.navbar .nav-links a:hover::after,
.navbar .nav-links a.active::after {
  width: 100%;
}

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--charcoal);
  transition: var(--transition);
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Hero 区域 */
.hero {
  text-align: center;
  padding: 5rem 2rem;
  background: linear-gradient(135deg, var(--soft-white) 0%, var(--gray-light) 100%);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--charcoal);
  letter-spacing: 3px;
}

.hero p {
  font-size: 1.3rem;
  color: var(--gray-medium);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero .btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background-color: var(--soft-gold);
  color: var(--soft-white);
  border-radius: 50px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: var(--transition);
}

.hero .btn:hover {
  background-color: var(--gold-light);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(212, 175, 55, 0.3);
}

/* 文章网格布局 */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2.5rem;
  padding: 4rem 0;
}

/* 文章卡片 */
.post-card {
  background-color: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  transition: var(--transition);
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.post-card .post-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: var(--transition);
}

.post-card:hover .post-image {
  transform: scale(1.05);
}

.post-card .post-content {
  padding: 2rem;
}

.post-card .post-category {
  display: inline-block;
  padding: 0.4rem 1rem;
  background-color: var(--soft-gold);
  color: var(--soft-white);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.post-card .post-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--charcoal);
  line-height: 1.4;
}

.post-card .post-excerpt {
  font-size: 1rem;
  color: var(--gray-medium);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.post-card .post-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--gray-light);
  font-size: 0.9rem;
  color: var(--gray-medium);
}

.post-card .post-date {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.post-card .read-more {
  color: var(--soft-gold);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 博客列表页 */
.blog-header {
  text-align: center;
  padding: 4rem 2rem 3rem;
}

.blog-header h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--charcoal);
}

.blog-header p {
  font-size: 1.2rem;
  color: var(--gray-medium);
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 2rem 0 5rem;
}

.post-list-item {
  display: flex;
  gap: 2rem;
  padding: 2rem;
  background-color: #fff;
  border-radius: 12px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  transition: var(--transition);
  cursor: pointer;
}

.post-list-item:hover {
  transform: translateX(10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.post-list-item .post-list-image {
  width: 280px;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}

.post-list-item .post-list-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.post-list-item .post-list-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--charcoal);
}

.post-list-item .post-list-excerpt {
  font-size: 1rem;
  color: var(--gray-medium);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.post-list-item .post-list-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--gray-medium);
}

/* 关于我页面 */
.about-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding: 4rem 0;
  align-items: center;
}

.about-image {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.about-image img {
  width: 100%;
  height: 500px;
  object-fit: cover;
}

.about-content h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--charcoal);
}

.about-content .intro {
  font-size: 1.2rem;
  color: var(--gray-medium);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.about-content .bio {
  font-size: 1rem;
  color: var(--charcoal);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1rem;
  color: var(--charcoal);
}

.contact-item .icon {
  width: 40px;
  height: 40px;
  background-color: var(--soft-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--soft-white);
  font-weight: 700;
}

/* 文章详情页 */
.article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.article-header {
  text-align: center;
  margin-bottom: 3rem;
}

.article-header .article-category {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background-color: var(--soft-gold);
  color: var(--soft-white);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.article-header h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--charcoal);
  line-height: 1.3;
}

.article-header .article-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  color: var(--gray-medium);
  font-size: 0.95rem;
}

.article-featured-image {
  width: 100%;
  height: 450px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 3rem;
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--charcoal);
}

.article-content h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 3rem 0 1.5rem;
  color: var(--charcoal);
}

.article-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--charcoal);
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content img {
  width: 100%;
  border-radius: 8px;
  margin: 2rem 0;
}

.article-content blockquote {
  border-left: 4px solid var(--soft-gold);
  padding-left: 2rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--gray-medium);
}

.article-content ul,
.article-content ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.article-content li {
  margin-bottom: 0.8rem;
}

.article-footer {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 2px solid var(--gray-light);
  text-align: center;
}

.article-footer p {
  color: var(--gray-medium);
  margin-bottom: 1.5rem;
}

.back-to-blog {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: var(--charcoal);
  color: var(--soft-white);
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
}

.back-to-blog:hover {
  background-color: var(--soft-gold);
  transform: translateY(-3px);
}

/* 页脚 */
.footer {
  background-color: var(--charcoal);
  color: var(--soft-white);
  padding: 3rem 2rem;
  text-align: center;
}

.footer p {
  font-size: 0.95rem;
  opacity: 0.8;
}

.footer .social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.footer .social-links a {
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.footer .social-links a:hover {
  background-color: var(--soft-gold);
  transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    padding: 1rem 1.5rem;
  }

  .navbar .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--soft-white);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  }

  .navbar .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .posts-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .post-list-item {
    flex-direction: column;
  }

  .post-list-item .post-list-image {
    width: 100%;
    height: 200px;
  }

  .about-section {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-image img {
    height: 350px;
  }

  .article-header h1 {
    font-size: 2rem;
  }

  .article-featured-image {
    height: 300px;
  }
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

/* 加载动画 */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
}

.loading::after {
  content: '';
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-light);
  border-top-color: var(--soft-gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===================================
   文章详情页样式
   =================================== */

.article-wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1rem;
}

.article-header {
  margin-bottom: 2rem;
}

.article-cover {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 2rem;
}

.article-meta-info {
  padding: 0 1rem;
}

.article-category {
  display: inline-block;
  background: var(--soft-gold);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--charcoal);
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--gray-medium);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.article-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.article-tags .tag {
  background: var(--gray-light);
  color: var(--charcoal);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

.article-content {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  margin-bottom: 2rem;
}

.article-content h1,
.article-content h2,
.article-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--charcoal);
}

.article-content h1 { font-size: 2rem; }
.article-content h2 { font-size: 1.5rem; }
.article-content h3 { font-size: 1.25rem; }

.article-content p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.article-content blockquote {
  border-left: 4px solid var(--soft-gold);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--gray-medium);
  font-style: italic;
}

.article-content ul,
.article-content ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--gray-light);
}

.back-link {
  display: inline-block;
  color: var(--soft-gold);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 2px solid var(--soft-gold);
  border-radius: 8px;
  transition: var(--transition);
}

.back-link:hover {
  background: var(--soft-gold);
  color: white;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .article-cover {
    height: 250px;
  }
  
  .article-title {
    font-size: 1.8rem;
  }
  
  .article-content {
    padding: 1.5rem;
  }
}

/* ===================================
   管理后台入口样式
   =================================== */

.admin-link {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--charcoal);
  color: white;
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 999;
  transition: var(--transition);
}

.admin-link:hover {
  background: var(--soft-gold);
  color: white;
  transform: translateY(-2px);
}