/* Life Savor Engineering Blog — Dark-first, techie, approachable */

:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-hover: #1c2128;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-accent: #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-accent-subtle: rgba(88, 166, 255, 0.1);
  --color-green: #3fb950;
  --color-orange: #d29922;
  --color-red: #f85149;
  --color-purple: #bc8cff;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, monospace;
  --max-width: 1200px;
  --content-width: 720px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Light mode override */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #ffffff;
    --color-surface: #f6f8fa;
    --color-surface-hover: #eef1f4;
    --color-border: #d0d7de;
    --color-text: #1f2328;
    --color-text-secondary: #656d76;
    --color-accent: #0969da;
    --color-accent-hover: #0550ae;
    --color-accent-subtle: rgba(9, 105, 218, 0.08);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  }
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

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

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.site-logo .logo-icon {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #fff;
  font-weight: 800;
}

.site-logo .logo-text-sub {
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-left: 0.25rem;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-accent-subtle);
}

/* ===== LAYOUT ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.layout-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .layout-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== HERO / FEATURED POST ===== */
.hero-featured {
  margin-bottom: 2.5rem;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.hero-featured:hover {
  border-color: var(--color-accent);
}

.hero-featured .hero-content {
  padding: 2rem 2.5rem;
}

.hero-featured .hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-green);
  margin-bottom: 0.75rem;
}

.hero-featured .hero-label::before {
  content: "●";
  font-size: 0.5rem;
}

.hero-featured h2 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.hero-featured h2 a {
  color: var(--color-text);
}

.hero-featured h2 a:hover {
  color: var(--color-accent);
}

.hero-featured .hero-excerpt {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.hero-featured .hero-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* ===== POST CARDS ===== */
.posts-section h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
}

.post-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.post-card h3 a {
  color: var(--color-text);
}

.post-card h3 a:hover {
  color: var(--color-accent);
}

.post-card .post-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card .post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.post-meta time {
  color: var(--color-text-secondary);
}

.post-meta .post-author {
  color: var(--color-accent);
}

/* ===== SIDEBAR ===== */
.sidebar {
  position: sticky;
  top: 5rem;
}

.sidebar-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.sidebar-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.sidebar-section .tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sidebar-section .sidebar-post {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-section .sidebar-post:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.sidebar-section .sidebar-post a {
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
}

.sidebar-section .sidebar-post a:hover {
  color: var(--color-accent);
}

.sidebar-section .sidebar-post time {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 0.2rem;
}

/* ===== TAGS ===== */
.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2em 0.6em;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-radius: 4px;
  border: 1px solid transparent;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.tag:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
  color: var(--color-accent-hover);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

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

.tag-list li {
  display: inline;
}

/* ===== ARTICLE / POST PAGE ===== */
.post {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.post-meta-full {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
}

.post-meta-full .author {
  color: var(--color-accent);
  font-weight: 500;
}

/* Post content typography */
.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

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

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

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

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--color-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.post-content pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

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

.post-content img {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin: 1.5rem 0;
}

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

.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 1rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

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

/* ===== SEARCH PAGE ===== */
.search-page h1 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.pagefind-ui {
  --pagefind-ui-scale: 0.9;
  --pagefind-ui-primary: var(--color-accent);
  --pagefind-ui-text: var(--color-text);
  --pagefind-ui-background: var(--color-surface);
  --pagefind-ui-border: var(--color-border);
  --pagefind-ui-tag: var(--color-accent-subtle);
  --pagefind-ui-border-width: 1px;
  --pagefind-ui-border-radius: var(--radius);
  --pagefind-ui-font: var(--font-sans);
}

/* ===== FOOTER ===== */
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* ===== 404 PAGE ===== */
.error-page {
  text-align: center;
  padding: 4rem 1rem;
}

.error-page h1 {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.error-page p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.pagination a,
.pagination span {
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero-featured .hero-content {
    padding: 1.5rem;
  }

  .hero-featured h2 {
    font-size: 1.35rem;
  }

  .post-header h1 {
    font-size: 1.75rem;
  }

  .layout-grid {
    grid-template-columns: 1fr;
  }
}