:root {
  --bg-main: #ffffff;
  --bg-secondary: #f8fafc;
  --text-pure: #000000;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --border-color: #e2e8f0;

  --accent-blue: #0ea5e9;
  --accent-teal: #0d9488;
  --github-dark: #24292f;

  --radius: 8px;
  --max-width: 1100px;

  color-scheme: light only;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
}

*:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  background: #f1f5f9;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.pill.blue { background: #e0f2fe; color: #0369a1; border-color: #bae6fd; }
.pill.teal { background: #ccfbf1; color: #0f766e; border-color: #99f6e4; }

.font-mono { font-family: 'JetBrains Mono', monospace; }

/* Navbar */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
}

.logo {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.logo svg.logo-icon, .logo img.logo-icon { width: 32px !important; height: 32px !important; max-width: 32px; max-height: 32px; flex-shrink: 0; object-fit: contain; }
.logo svg { width: 24px; height: 24px; color: var(--accent-teal); }

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.15s;
}

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

.github-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary) !important;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  transition: all 0.15s;
}
.github-link:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.github-link svg { width: 16px; height: 16px; }

/* Hero */
.hero {
  padding: 3.5rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image:
    linear-gradient(to right, #f1f5f9 1px, transparent 1px),
    linear-gradient(to bottom, #f1f5f9 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  mask-image: radial-gradient(circle at center, black, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-pure) 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--text-pure);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.post-hero { text-align: left; }
.post-hero h1 {
  background: none;
  -webkit-text-fill-color: var(--text-primary);
  color: var(--text-primary);
}
.post-hero::before { display: none; }

.btn-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  gap: 0.5rem;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.btn-primary {
  background-color: var(--text-pure);
  color: white;
  border: 1px solid var(--text-pure);
}
.btn-primary:hover { background-color: #333; }

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-outline:hover {
  background-color: var(--bg-secondary);
  border-color: #cbd5e1;
}

/* Banner */
.os-banner {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 0;
  text-align: center;
}
.os-banner p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.os-banner svg { width: 16px; height: 16px; color: var(--text-tertiary); }

/* Sections */
.section {
  padding: 4rem 0;
}

.section-header {
  margin-bottom: 3rem;
}
.section-header h2 { font-size: 2.25rem; margin-bottom: 1rem; }
.section-header p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}
.card:hover {
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.1);
  border-color: #cbd5e1;
  transform: translateY(-6px);
}

.card.featured {
  border-color: var(--accent-blue);
  box-shadow: 0 4px 20px -5px rgba(14, 165, 233, 0.15);
  position: relative;
  overflow: hidden;
}
.card.featured::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
}

.card h3 { font-size: 1.25rem; margin-bottom: 1rem; color: var(--text-primary); line-height: 1.3; }
.card h3 a:hover { color: var(--accent-blue); transition: color 0.15s; }
.card p { color: var(--text-secondary); flex-grow: 1; margin-bottom: 1.5rem; font-size: 0.95rem; }

.card-footer {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.card-footer .btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Architecture/CTA block */
.architecture {
  background: var(--github-dark);
  background-image: radial-gradient(circle at top right, #30363d, var(--github-dark));
  color: white;
  border-radius: var(--radius);
  padding: 4rem;
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.architecture h2 { color: white; margin-bottom: 1.5rem; }
.architecture p { color: #8b949e; margin-bottom: 1rem; font-size: 1.05rem; }
.architecture ul { color: #8b949e; margin-left: 1.5rem; margin-bottom: 2rem; }
.architecture li { margin-bottom: 0.5rem; }

.code-window {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 6px;
  overflow: hidden;
}
.code-header {
  background: #161b22;
  padding: 10px 15px;
  border-bottom: 1px solid #30363d;
  display: flex;
  gap: 6px;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: #ff5f56; }
.dot.y { background: #ffbd2e; }
.dot.g { background: #27c93f; }

.code-content {
  padding: 1.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: #c9d1d9;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  margin: 0;
}
.token-keyword { color: #ff7b72; }
.token-string { color: #a5d6ff; }
.token-function { color: #d2a8ff; }
.token-comment { color: #8b949e; }

/* Post body — prose styling */
.post-body {
  font-size: 1.075rem;
  line-height: 1.8;
  color: var(--text-primary);
}
.post-body > * { margin-bottom: 1.5rem; }
.post-body h2 {
  font-size: 1.75rem;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
  padding-top: 1rem;
  letter-spacing: -0.02em;
}
.post-body h3 {
  font-size: 1.35rem;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
}
.post-body h4 {
  font-size: 1.1rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}
.post-body p { color: var(--text-primary); }
.post-body a {
  color: var(--accent-blue);
  text-decoration: underline;
  text-decoration-color: rgba(14, 165, 233, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}
.post-body a:hover { text-decoration-color: var(--accent-blue); }
.post-body strong { font-weight: 700; color: var(--text-pure); }
.post-body em { color: var(--text-secondary); }

.post-body ul, .post-body ol {
  margin-left: 1.5rem;
  padding-left: 0.5rem;
}
.post-body li { margin-bottom: 0.6rem; }
.post-body li > ul, .post-body li > ol { margin-top: 0.6rem; margin-bottom: 0; }

.post-body blockquote {
  border-left: 4px solid var(--accent-teal);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 2rem 0;
  color: var(--text-secondary);
  font-style: italic;
  background: var(--bg-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.post-body blockquote p { margin: 0; }

.post-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875em;
  background: #f1f5f9;
  color: #be185d;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.post-body pre {
  background: #0d1117;
  color: #c9d1d9;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  border: 1px solid #30363d;
  margin: 2rem 0;
}
.post-body pre code {
  background: none;
  color: inherit;
  border: none;
  padding: 0;
  font-size: inherit;
}

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  margin: 2rem auto;
  display: block;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}
.post-body th, .post-body td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}
.post-body th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 3rem 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 3rem 0;
  margin-top: 6rem;
  background: var(--bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}
.footer-links a:hover { color: var(--text-primary); }

@media (max-width: 768px) {
  .hide-on-mobile { display: none !important; }
  nav { padding: 1rem 0; }
  .container { padding: 0 1.25rem; }
  .logo { font-size: 1.05rem; }
  .nav-links { gap: 0.75rem; }
  .nav-links a { font-size: 0.85rem; }
  .github-link { padding: 0.35rem 0.6rem; font-size: 0.8rem; }
  .github-link svg { width: 14px; height: 14px; }

  .architecture { grid-template-columns: 1fr; padding: 2rem; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr; text-align: left; }
  .footer-links { justify-content: flex-start; }

  .hero { padding: 2rem 0 2.5rem; }
  .hero h1 { font-size: 2.25rem; }
  .hero p { font-size: 1.05rem; }
  .post-hero h1 { font-size: 1.85rem !important; }

  .section { padding: 3rem 0; }
  .section-header h2 { font-size: 1.75rem; }

  .post-body { font-size: 1rem; line-height: 1.75; }
  .post-body h2 { font-size: 1.5rem; }
  .post-body h3 { font-size: 1.2rem; }
  .post-body pre { padding: 1rem; font-size: 0.85rem; }
}