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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background-color: #0d1117;
  color: #e6edf3;
  line-height: 1.6;
}

/* =========================
   Layout
========================= */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  margin-bottom: 2rem;
}

footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid #30363d;
  font-size: 0.9rem;
  color: #8b949e;
}

/* =========================
   Typography
========================= */
h1, h2, h3, h4 {
  color: #f0f6fc;
  margin-bottom: 0.6rem;
  line-height: 1.25;
}

h1 {
  font-size: 2.2rem;
}

h2 {
  font-size: 1.6rem;
  margin-top: 2.2rem;
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.6rem;
}

p {
  margin-bottom: 1rem;
  color: #c9d1d9;
}

/* =========================
   Links
========================= */
a {
  color: #58a6ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* =========================
   Code & Pre
========================= */
code {
  background-color: #161b22;
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.95em;
}

pre {
  background-color: #161b22;
  padding: 1rem;
  border-radius: 10px;
  overflow-x: auto;
  margin: 1.2rem 0;
}

pre code {
  background: none;
  padding: 0;
}

/* =========================
   Lists
========================= */
ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.4rem;
}

/* =========================
   Sections / Cards
========================= */
.section {
  margin-bottom: 2.5rem;
}

.card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 12px;
  padding: 1.4rem;
  margin-top: 1rem;
}

/* =========================
   Badges / Labels
========================= */
.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  border-radius: 999px;
  background-color: #238636;
  color: #ffffff;
  font-weight: 600;
}

/* =========================
   Responsive
========================= */
@media (max-width: 600px) {
  h1 {
    font-size: 1.8rem;
  }

  .container {
    padding: 1.5rem 1rem;
  }
}