/* Zenn-like Design */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --zenn-blue: #3EA8FF;
  --zenn-blue-dark: #0F83FD;
  --zenn-bg-light: #EDF2F7;
  --zenn-bg-dark: #0F172A;
  --zenn-card-light: #FFFFFF;
  --zenn-card-dark: #1E293B;
  --zenn-text-light: #1A202C;
  --zenn-text-dark: #E2E8F0;
  --zenn-text-muted-light: #65737E;
  --zenn-text-muted-dark: #94A3B8;
  --zenn-border-light: #E2E8F0;
  --zenn-border-dark: #334155;
  --zenn-header-light: #FFFFFF;
  --zenn-header-dark: #1E293B;
  --radius: 12px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--zenn-bg-light);
  color: var(--zenn-text-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html.dark body {
  background-color: var(--zenn-bg-dark);
  color: var(--zenn-text-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) body {
    background-color: var(--zenn-bg-dark);
    color: var(--zenn-text-dark);
  }
}

/* Header */
header {
  background-color: var(--zenn-header-light);
  border-bottom: 1px solid var(--zenn-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

html.dark header {
  background-color: var(--zenn-header-dark);
  border-bottom-color: var(--zenn-border-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) header {
    background-color: var(--zenn-header-dark);
    border-bottom-color: var(--zenn-border-dark);
  }
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--zenn-text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

html.dark .logo {
  color: var(--zenn-text-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .logo {
    color: var(--zenn-text-dark);
  }
}

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

nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

nav a {
  color: var(--zenn-text-muted-light);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

html.dark nav a {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) nav a {
    color: var(--zenn-text-muted-dark);
  }
}

nav a:hover {
  color: var(--zenn-blue);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background-color: var(--zenn-bg-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, transform 0.2s;
}

html.dark .theme-toggle {
  background-color: var(--zenn-card-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .theme-toggle {
    background-color: var(--zenn-card-dark);
  }
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--zenn-text-muted-light);
}

html.dark .theme-toggle svg {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .theme-toggle svg {
    color: var(--zenn-text-muted-dark);
  }
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* Article List */
.articles-header {
  margin-bottom: 32px;
}

.articles-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-list {
  display: grid;
  gap: 16px;
}

/* Article Card */
.article-card {
  background-color: var(--zenn-card-light);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-decoration: none;
  display: block;
  transition: box-shadow 0.2s, transform 0.2s;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

html.dark .article-card {
  background-color: var(--zenn-card-dark);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-card {
    background-color: var(--zenn-card-dark);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }
}

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

html.dark .article-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }
}

.article-emoji {
  font-size: 2.5rem;
  line-height: 1;
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--radius-sm);
}

.article-content {
  flex: 1;
  min-width: 0;
}

.article-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--zenn-text-light);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

html.dark .article-title {
  color: var(--zenn-text-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-title {
    color: var(--zenn-text-dark);
  }
}

.article-card:hover .article-title {
  color: var(--zenn-blue);
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--zenn-text-muted-light);
}

html.dark .article-meta {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-meta {
    color: var(--zenn-text-muted-dark);
  }
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background-color: var(--zenn-bg-light);
  color: var(--zenn-text-muted-light);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 20px;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

html.dark .tag {
  background-color: var(--zenn-bg-dark);
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .tag {
    background-color: var(--zenn-bg-dark);
    color: var(--zenn-text-muted-dark);
  }
}

.tag:hover {
  background-color: var(--zenn-blue);
  color: white;
}

/* Article Page */
.article-page {
  max-width: 800px;
  margin: 0 auto;
}

.article-header {
  background-color: var(--zenn-card-light);
  border-radius: var(--radius);
  padding: 40px;
  margin-bottom: 24px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

html.dark .article-header {
  background-color: var(--zenn-card-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-header {
    background-color: var(--zenn-card-dark);
  }
}

.article-header .emoji {
  font-size: 4rem;
  margin-bottom: 24px;
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-header .meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--zenn-text-muted-light);
  font-size: 0.9rem;
}

html.dark .article-header .meta {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-header .meta {
    color: var(--zenn-text-muted-dark);
  }
}

/* Article Content */
.article-body {
  background-color: var(--zenn-card-light);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

html.dark .article-body {
  background-color: var(--zenn-card-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-body {
    background-color: var(--zenn-card-dark);
  }
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--zenn-border-light);
}

html.dark .article-body h2 {
  border-bottom-color: var(--zenn-border-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-body h2 {
    border-bottom-color: var(--zenn-border-dark);
  }
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

.article-body p {
  margin-bottom: 24px;
  line-height: 1.9;
}

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

.article-body li {
  margin-bottom: 8px;
  line-height: 1.8;
}

.article-body ul {
  list-style-type: disc;
}

.article-body ol {
  list-style-type: decimal;
}

.article-body a {
  color: var(--zenn-blue);
  text-decoration: none;
}

.article-body a:hover {
  text-decoration: underline;
}

.article-body code {
  background-color: var(--zenn-bg-light);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;
}

html.dark .article-body code {
  background-color: var(--zenn-bg-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-body code {
    background-color: var(--zenn-bg-dark);
  }
}

.article-body pre {
  background-color: #1E293B;
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.article-body pre code {
  background-color: transparent;
  padding: 0;
  color: #E2E8F0;
}

.article-body blockquote {
  border-left: 4px solid var(--zenn-blue);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--zenn-text-muted-light);
  font-style: italic;
}

html.dark .article-body blockquote {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-body blockquote {
    color: var(--zenn-text-muted-dark);
  }
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--zenn-border-light);
  margin: 40px 0;
}

html.dark .article-body hr {
  border-top-color: var(--zenn-border-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) .article-body hr {
    border-top-color: var(--zenn-border-dark);
  }
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 24px 0;
}

/* Footer */
footer {
  margin-top: 80px;
  padding: 40px 24px;
  text-align: center;
  color: var(--zenn-text-muted-light);
  font-size: 0.9rem;
}

html.dark footer {
  color: var(--zenn-text-muted-dark);
}

@media (prefers-color-scheme: dark) {
  html:not(.light) footer {
    color: var(--zenn-text-muted-dark);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  nav {
    display: none;
  }

  main {
    padding: 24px 16px;
  }

  .article-card {
    padding: 16px;
  }

  .article-emoji {
    width: 48px;
    height: 48px;
    font-size: 2rem;
  }

  .article-header {
    padding: 24px;
  }

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

  .article-body {
    padding: 24px;
  }
}

/* Utility */
.hidden {
  display: none !important;
}