:root {
  --bg: #f4f5f7;
  --fg: #12141a;
  --muted: #5b6270;
  --accent: #057a6e;
  --accent-soft: rgba(5, 122, 110, 0.1);
  --border: #dde1e7;
  --card-bg: #ffffff;
  --grid-line: rgba(18, 20, 26, 0.045);
  --max-width: 680px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e14;
    --fg: #e4e7ec;
    --muted: #7b8496;
    --accent: #2dd8c5;
    --accent-soft: rgba(45, 216, 197, 0.12);
    --border: #1d222b;
    --card-bg: #10151c;
    --grid-line: rgba(255, 255, 255, 0.045);
  }
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  padding: 0 1.5rem;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
}

main, header, footer {
  max-width: var(--max-width);
  margin: 0 auto;
}

header {
  padding: 3rem 0 1.75rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

header h1 a {
  color: var(--fg);
  text-decoration: none;
}

header h1 a::before {
  content: "> ";
  color: var(--accent);
}

header h1 a::after {
  content: "_";
  color: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

header p {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

nav {
  margin-top: 1.1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-right: 1.5rem;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

nav a::before {
  content: "/";
  color: var(--border);
  margin-right: 0.3rem;
}

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

main {
  padding: 2.5rem 0 4rem;
  min-height: 50vh;
  animation: fade-in 0.4s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

h1, h2, h3 {
  line-height: 1.3;
}

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

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  margin-bottom: 1rem;
  padding: 1.25rem 1.4rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.post-list li:hover {
  transform: translateX(3px);
  box-shadow: 0 0 0 1px var(--accent-soft), 0 8px 24px -12px var(--accent-soft);
}

.post-list .date {
  display: block;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.post-list .date::before {
  content: "// ";
  color: var(--border);
}

.post-list a {
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--fg);
}

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

.post-list .excerpt {
  color: var(--muted);
  font-size: 1rem;
  margin: 0.4rem 0 0;
}

article header {
  border-bottom: none;
  padding: 0 0 1rem;
  margin-bottom: 1rem;
}

article h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.post-meta {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
}

.post-meta::before {
  content: "// ";
  color: var(--border);
}

article pre {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.9rem;
}

article code {
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: var(--mono);
}

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

article img {
  max-width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8rem;
}

footer a {
  color: var(--muted);
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--muted);
}

.back-link:hover {
  color: var(--accent);
}