/* ===== CSS Variables ===== */
:root {
  --bg: #faf8f5;
  --text: #444;
  --title: #333;
  --subtle: #a09080;
  --border: #e8e0d8;
  --tag-bg: #f0ebe4;
  --tag-text: #8a7d6b;
  --code-bg: #f5f0ea;
  --link: #6b5e50;
  --link-hover: #333;
  --nav-dot: #d0c8c0;
  --blockquote-border: #d0c8c0;
  --blockquote-text: #777;
}

[data-theme="dark"] {
  --bg: #1c1a17;
  --text: #b0a898;
  --title: #e8e0d8;
  --subtle: #7a6e60;
  --border: #3a3530;
  --tag-bg: #2a2520;
  --tag-text: #a09080;
  --code-bg: #252220;
  --link: #c0b0a0;
  --link-hover: #e8e0d8;
  --nav-dot: #3a3530;
  --blockquote-border: #3a3530;
  --blockquote-text: #7a6e60;
}

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

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

body {
  font-family: "Noto Serif SC", Georgia, "Times New Roman", serif;
  font-weight: 400;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.8;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

/* ===== Layout ===== */
.container {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  text-align: center;
  padding: 48px 0 24px;
}

.site-title {
  font-size: 1.625rem;
  color: var(--title);
  letter-spacing: 3px;
  font-weight: 400;
}

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

.site-subtitle {
  font-size: 0.75rem;
  color: var(--subtle);
  margin-top: 10px;
  letter-spacing: 1px;
}

.site-nav {
  margin-top: 16px;
  font-size: 0.8125rem;
}

.site-nav a {
  color: var(--subtle);
  margin: 0 8px;
}

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

.nav-dot {
  color: var(--nav-dot);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  padding: 0;
  margin-left: 8px;
  vertical-align: middle;
}

/* ===== Divider ===== */
.site-header::after {
  content: "";
  display: block;
  width: calc(100% - 48px);
  max-width: 700px;
  height: 1px;
  background: var(--border);
  margin: 24px auto 0;
}

/* ===== Post List ===== */
.post-list {
  list-style: none;
  padding: 24px 0;
}

.post-item {
  margin-bottom: 28px;
}

.post-date {
  font-size: 0.75rem;
  color: var(--subtle);
}

.post-title {
  font-size: 1.0625rem;
  color: var(--title);
  font-weight: 500;
  margin: 4px 0;
  display: block;
}

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

.post-summary {
  font-size: 0.8125rem;
  color: var(--subtle);
  line-height: 1.7;
}

.post-tags {
  margin-top: 6px;
}

.tag {
  display: inline-block;
  font-size: 0.6875rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 2px 8px;
  border-radius: 10px;
  margin-right: 4px;
}

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

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 16px 0 32px;
  font-size: 0.8125rem;
  color: var(--subtle);
}

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

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

/* ===== Article ===== */
.article-header {
  margin-bottom: 16px;
}

.article-title {
  font-size: 1.375rem;
  color: var(--title);
  font-weight: 500;
  margin-bottom: 8px;
}

.article-meta {
  font-size: 0.75rem;
  color: var(--subtle);
  margin-bottom: 6px;
}

.article-content {
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.9375rem;
  line-height: 2;
}

.article-content h2 {
  font-size: 1.0625rem;
  color: var(--title);
  font-weight: 500;
  margin: 32px 0 12px;
}

.article-content h3 {
  font-size: 1rem;
  color: var(--title);
  font-weight: 500;
  margin: 24px 0 8px;
}

.article-content p {
  margin-bottom: 12px;
}

.article-content ul,
.article-content ol {
  margin-bottom: 12px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 4px;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 12px 0;
}

.article-content blockquote {
  border-left: 3px solid var(--blockquote-border);
  margin: 12px 0;
  padding: 8px 16px;
  color: var(--blockquote-text);
  font-style: italic;
}

.article-content pre {
  background: var(--code-bg);
  border-radius: 6px;
  padding: 12px 16px;
  overflow-x: auto;
  margin: 12px 0;
  font-size: 0.8125rem;
  line-height: 1.6;
}

.article-content code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

.article-content p code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.85em;
}

.article-content a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 0.875rem;
}

.article-content th,
.article-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.article-content th {
  background: var(--tag-bg);
  color: var(--title);
  font-weight: 500;
}

/* ===== Post Navigation ===== */
.post-nav {
  display: flex;
  justify-content: space-between;
  padding: 24px 0;
  margin-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--subtle);
}

.post-nav a {
  color: var(--subtle);
}

.post-nav a:hover {
  color: var(--title);
}

/* ===== Archive ===== */
.archive-year {
  font-size: 1.125rem;
  color: var(--title);
  font-weight: 500;
  margin: 32px 0 12px;
}

.archive-list {
  list-style: none;
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 8px;
  font-size: 0.875rem;
}

.archive-item .post-date {
  flex-shrink: 0;
  width: 60px;
}

/* ===== Tags Page ===== */
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0;
}

.tags-cloud .tag {
  font-size: 0.8125rem;
  padding: 4px 12px;
}

/* ===== About Page ===== */
.page-content {
  padding: 24px 0;
  font-size: 0.9375rem;
  line-height: 2;
}

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 24px 0;
  font-size: 0.6875rem;
  color: var(--subtle);
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

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

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .site-header {
    padding: 32px 0 16px;
  }
  .site-title {
    font-size: 1.375rem;
  }
  .article-title {
    font-size: 1.1875rem;
  }
  .post-nav {
    flex-direction: column;
    gap: 8px;
  }
}