/* ===== 基础重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-gray: #f9fafb;
  --color-border: #e5e7eb;
  --max-width: 1200px;
  --header-height: 64px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
}

/* ===== 头部导航 ===== */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.nav {
  display: flex;
  gap: 2rem;
}

.nav a {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.nav a:hover,
.nav a.active {
  color: var(--color-primary);
}

/* ===== 主容器 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: calc(100vh - var(--header-height) - 80px);
}

/* ===== 首页 Hero ===== */
.hero {
  text-align: center;
  padding: 4rem 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 分区标题 ===== */
.section-title {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

/* ===== 文章卡片网格 ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.article-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.article-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--color-text);
}

.article-card h3 a:hover {
  color: var(--color-primary);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ===== 文章列表页 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.article-list-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: box-shadow 0.2s;
}

.article-list-item:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.article-list-item h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.article-list-item h2 a {
  color: var(--color-text);
}

.article-list-item h2 a:hover {
  color: var(--color-primary);
}

/* ===== 文章详情页 ===== */
.article-detail {
  max-width: 800px;
  margin: 0 auto;
}

.article-detail h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

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

.article-content h2,
.article-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.article-content code {
  background: var(--color-bg-gray);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.article-content pre {
  background: var(--color-bg-gray);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.article-content pre code {
  background: none;
  padding: 0;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem 0;
}

/* 文章导航 */
.article-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.article-nav a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--color-bg-gray);
  border-radius: 6px;
  font-size: 0.9rem;
}

.article-nav a:hover {
  background: var(--color-border);
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.pagination a,
.pagination span {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.9rem;
}

.pagination a:hover {
  background: var(--color-bg-gray);
}

.pagination .active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.pagination .disabled {
  color: var(--color-text-light);
  cursor: not-allowed;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--color-text-light);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* ===== 加载状态 ===== */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-light);
}

/* ===== 空状态 ===== */
.empty {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-light);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .article-grid {
    grid-template-columns: 1fr;
  }

  .article-detail h1 {
    font-size: 1.5rem;
  }

  .article-nav {
    flex-direction: column;
    gap: 1rem;
  }

  .article-nav a {
    width: 100%;
    text-align: center;
  }
}