/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  --font-serif: Georgia, "Noto Serif SC", "Source Han Serif SC", serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
  --color-text: #2c2c2c;
  --color-text-light: #666;
  --color-link: #1a1a1a;
  --color-link-hover: #555;
  --color-bg: #fff;
  --color-border: #eaeaea;
  --color-code-bg: #f6f8fa;
  --max-width: 680px;
}

html {
  font-size: 16px;
  line-height: 1.75;
}

body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ===== Header ===== */
.site-header {
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.site-title {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.5px;
}

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

.site-nav a {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-decoration: none;
  margin-left: 1.25rem;
  transition: color 0.2s;
}

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

.social-links {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.social-links a {
  color: var(--color-text-light);
  transition: color 0.2s;
  display: inline-flex;
}

.social-links a:hover {
  color: var(--color-text);
}

/* ===== Post List ===== */
.post-list {
  list-style: none;
}

.post-item {
  display: flex;
  align-items: baseline;
  padding: 0.6rem 0;
  gap: 1.25rem;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-light);
  white-space: nowrap;
  min-width: 90px;
}

.post-item .post-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-link);
  text-decoration: none;
  font-weight: 500;
  line-height: 1.4;
}

.post-item .post-title:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

.post-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

/* ===== List Pages ===== */
.page-title {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag-item {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
}

.tag-item:hover {
  color: var(--color-link-hover);
  border-color: var(--color-text-light);
}

.tag-count {
  color: var(--color-text-light);
}

.archive-year {
  margin-bottom: 2rem;
}

.archive-year h2 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: 0.875rem;
}

.pagination a {
  color: var(--color-text-light);
  text-decoration: none;
}

.pagination a:hover {
  color: var(--color-text);
}

.page-number {
  color: var(--color-text-light);
}

/* ===== Single Post ===== */
.post-header {
  margin-bottom: 2rem;
}

.post-header .post-title {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

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

.post-meta time {
  font-family: var(--font-mono);
}

.post-tags {
  margin-top: 0.5rem;
}

.post-tags a {
  font-size: 0.8rem;
  color: var(--color-text-light);
  text-decoration: none;
  margin-right: 0.5rem;
}

.post-tags a:hover {
  color: var(--color-text);
}

/* ===== Post Content ===== */
.post-content {
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: var(--font-sans);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  line-height: 1.3;
}

.post-content h2 {
  font-size: 1.4rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--color-border);
}

.post-content h3 {
  font-size: 1.2rem;
}

.post-content p {
  margin-bottom: 1.25rem;
}

.post-content a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-content a:hover {
  color: var(--color-link-hover);
}

.post-content ul,
.post-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.post-content li {
  margin-bottom: 0.4rem;
}

.post-content blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: 1rem;
  color: var(--color-text-light);
  margin: 1.5rem 0;
  font-style: italic;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 1.5rem 0;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--color-code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
}

.post-content pre {
  background: var(--color-code-bg);
  padding: 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.5;
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.post-content th,
.post-content td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.post-content th {
  background: var(--color-code-bg);
  font-weight: 600;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-light);
  text-align: center;
}

.site-footer a {
  color: var(--color-text-light);
  text-decoration: none;
}

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

.site-footer p {
  margin-bottom: 0.25rem;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem 1rem;
  }

  .post-item {
    flex-direction: column;
    gap: 0.2rem;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .site-nav a:first-child {
    margin-left: 0;
  }

  .post-header .post-title {
    font-size: 1.4rem;
  }
}