/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-text: #333;
  --color-text-light: #666;
  --color-primary: #333;
  --color-primary-dark: #333;
  --color-border: #e5e5e5;
  --color-card-bg: #fff;
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --max-width: 1080px;
  --max-width-wide: 900px;
  --spacing: 1.5rem;
}

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

.container-narrow {
  max-width: 720px;
}

/* Header */
.site-header {
  background: var(--color-card-bg);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  display: flex;
  justify-content: center;
  align-items: center;
}

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

.logo:hover {
  color: var(--color-primary);
}

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

.nav-links a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: #333;
}

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
  max-width: 720px;
  margin: 0 auto;
}

.hero-photo {
  margin-bottom: 2rem;
}

.hero-photo img {
  max-width: 150px;
  border-radius: 4px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.hero-bio {
  color: var(--color-text);
  font-size: 1.1rem;
  line-height: 1.7;
  text-align: center;
}

/* Posts */
.posts {
  padding-bottom: 4rem;
}

.post-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.post-date {
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: block;
  margin-bottom: 0.5rem;
}

.post-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

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

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

.post-excerpt {
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.read-more {
  font-size: 0.9rem;
  font-weight: 500;
}

/* Single post page */
.post-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.post-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.post-content {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  padding-bottom: 3rem;
}

.post-content h2 {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

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

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

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

.post-content code {
  background: var(--color-border);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

.post-content pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

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

/* About page */
.about-content {
  padding: 3rem 0;
}

.about-content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.about-content p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

/* Archive page */
.archive-content {
  padding: 3rem 0;
}

.archive-content h1 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

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

.archive-item {
  display: flex;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.archive-item time {
  color: var(--color-text-light);
  font-size: 0.9rem;
  min-width: 100px;
}

/* Page header */
.page-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

/* Series card (on writing page) */
.series-section {
  margin-bottom: 2rem;
}

.series-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  color: var(--color-text);
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.series-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--color-text);
}

.series-card-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.series-card-content p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

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

.series-arrow {
  font-size: 1.5rem;
  color: var(--color-text-light);
  transition: transform 0.2s ease;
}

.series-card:hover .series-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

/* Series index page */
.series-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.series-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.series-description {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

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

.series-list {
  padding-bottom: 3rem;
}

.series-list ol {
  list-style: none;
}

.series-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.series-item-number {
  color: var(--color-text-light);
  font-size: 0.9rem;
  min-width: 2rem;
  text-align: right;
}

.series-item a {
  flex: 1;
  color: var(--color-text);
}

.series-item a:hover {
  color: var(--color-primary);
}

.series-item time {
  color: var(--color-text-light);
  font-size: 0.85rem;
}

/* Series navigation (on post pages) */
.series-nav {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem;
  margin: 1.5rem 0;
}

.series-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.series-info a {
  font-weight: 600;
}

.series-progress {
  color: var(--color-text-light);
}

.series-links {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

.prev-post,
.next-post {
  color: var(--color-text-light);
}

.prev-post:hover,
.next-post:hover {
  color: var(--color-primary);
}

/* Projects section */
.projects-section {
  padding-bottom: 3rem;
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.projects-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.projects-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.project-card {
  display: flex;
  flex-direction: column;
}

.project-card-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1rem;
  border-radius: 12px;
}

.project-image {
  display: flex;
  height: 100%;
  overflow: hidden;
  background: var(--color-border);
  border-radius: 12px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.project-image:hover img {
  transform: scale(1.05);
}

.project-content {
  padding: 1.5rem;
  background: #f0f4f8;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.project-title a {
  color: var(--color-text);
}

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

.project-description {
  color: var(--color-text-light);
  font-size: 1rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-detail {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.project-role {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  background: var(--color-bg);
  color: var(--color-text-light);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--color-card-bg);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
}

.site-footer p {
  color: var(--color-text-light);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .project-card-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  .post-title {
    font-size: 1.25rem;
  }

  .nav-links {
    gap: 1rem;
  }
}