:root {
  /* Light theme (default) */
  --bg: #ffffff;
  --fg: #0b0d12;
  --muted: #5b657a;
  --accent: #1e66f5;
  --card: #f8fafc;
  --border: #e6eaf0;
  --border-hover: #cdd6e3;

  --code-bg: #f5f7fb;
  --code-fg: #1c2333;
}

/* Dark theme overrides */
:root[data-theme="dark"] {
  --bg: #0b0d12;
  --fg: #e6e9ef;
  --muted: #a0a6b3;
  --accent: #4ea1ff;
  --card: #121622;
  --border: #1d2433;
  --border-hover: #2a3446;

  --code-bg: #0e1420;
  --code-fg: #dce3f0;
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Inter,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

header,
footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

header h1,
header nav {
  display: inline-block;
  vertical-align: middle;
}
header h1 a {
  color: var(--fg);
}
header nav {
  float: right;
}
header nav a {
  margin-left: 16px;
  color: var(--muted);
}
header nav a:hover {
  color: var(--fg);
}

/* Theme toggle button */
.theme-toggle {
  margin-left: 16px;
  padding: 6px 10px;
  font: inherit;
  color: var(--fg);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.theme-toggle:hover {
  border-color: var(--border-hover);
}
.theme-toggle:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition:
    transform 0.12s ease,
    border-color 0.12s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}
.card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
}
.card h2 {
  margin: 12px 12px 0;
  font-size: 1.1rem;
}
.card p {
  margin: 8px 12px 12px;
  color: var(--muted);
  font-size: 0.95rem;
}
.card .date {
  font-size: 0.85rem;
  color: var(--muted);
}

article h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}
.post-meta {
  color: var(--muted);
  margin-bottom: 16px;
}
figure {
  margin: 0 0 16px 0;
}
figure img {
  width: 100%;
  height: auto;
  border-radius: 12px;
}
pre,
code {
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--border);
}
pre {
  padding: 12px;
  overflow-x: auto;
  border-radius: 10px;
}
code {
  padding: 2px 6px;
  border-radius: 6px;
}

footer {
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
}