/* ========================================
   个人博客 - 样式表
   ======================================== */

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

:root {
  --color-bg: #fdfdfd;
  --color-text: #333;
  --color-text-light: #666;
  --color-text-lighter: #999;
  --color-accent: #2c7a7b;
  --color-accent-light: #e8f4f4;
  --color-border: #eaeaea;
  --color-card-bg: #fff;
  --color-code-bg: #f6f8fa;
  --max-width: 780px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo, monospace;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- 链接 --- */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #236b6b;
  text-decoration: underline;
}

/* --- 头部导航 --- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.site-title a {
  color: inherit;
  text-decoration: none;
}

.site-title a:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-text-light);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

/* --- 主体 --- */
.site-main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* --- 页面标题 --- */
.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-subtitle {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

/* --- 文章列表 --- */
.post-list {
  list-style: none;
}

.post-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.post-item:first-child {
  padding-top: 0;
}

.post-item:last-child {
  border-bottom: none;
}

.post-date {
  font-size: 0.85rem;
  color: var(--color-text-lighter);
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
}

.post-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

.post-title a {
  color: var(--color-text);
  text-decoration: none;
}

.post-title a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.post-excerpt {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.65;
}

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

.tag {
  display: inline-block;
  font-size: 0.78rem;
  padding: 0.15rem 0.6rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 3px;
}

/* --- 文章正文 --- */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.article-meta {
  font-size: 0.88rem;
  color: var(--color-text-lighter);
}

.article-body {
  font-size: 1rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  padding-top: 0.5rem;
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  margin-bottom: 1rem;
}

.article-body ul,
.article-body ol {
  margin: 0.5rem 0 1rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.35rem;
}

.article-body blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-light);
  color: var(--color-text-light);
  font-style: italic;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-code-bg);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}

.article-body pre {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--color-code-bg);
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

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

.article-body img {
  max-width: 100%;
  border-radius: 6px;
  margin: 1rem 0;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

/* --- 文章底部 --- */
.article-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.back-link {
  font-size: 0.9rem;
}

/* --- 关于页面 --- */
.about-section {
  margin-bottom: 2rem;
}

.about-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.about-section p {
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-list li {
  padding: 0.3rem 0.8rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 4px;
  font-size: 0.88rem;
}

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

.site-footer a {
  color: var(--color-text-light);
}

.footer-beian {
  margin-top: 0.35rem;
}

/* --- 响应式 --- */
@media (max-width: 600px) {
  .header-inner {
    height: 48px;
  }

  .site-title {
    font-size: 1.1rem;
  }

  .site-nav {
    gap: 1rem;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

  .site-main {
    padding: 1.5rem 1rem 3rem;
  }

  .page-title {
    font-size: 1.4rem;
  }

  .article-title {
    font-size: 1.4rem;
  }

  .post-title {
    font-size: 1.05rem;
  }
}