:root {
  --bg: #111111;
  --bg-soft: #1b1b1b;
  --fg: #e6e6e6;
  --fg-soft: #aaaaaa;
  --border: #2d2d2d;
  --accent: #d0d0d0;
  --max-width: 920px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.7;
}


body.light {
  --bg: #f5f5f5;
  --bg-soft: #ffffff;
  --fg: #1b1b1b;
  --fg-soft: #666666;
  --border: #dddddd;
  --accent: #222222;
}

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

.topbar {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(17,17,17,0.85);
  z-index: 100;
}

body.light .topbar {
  background: rgba(245,245,245,0.85);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  letter-spacing: 1px;
}

.logo span {
  color: var(--fg-soft);
}

.menu {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.menu a,
.theme-toggle {
  color: var(--fg-soft);
  text-decoration: none;
  font-size: 0.95rem;
  transition: 0.2s ease;
}

.menu a:hover,
.theme-toggle:hover {
  color: var(--fg);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
}

.hero {
  padding: 5rem 0 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0.6rem;
  line-height: 1.1;
}

.hero p {
  color: var(--fg-soft);
  max-width: 680px;
  font-size: 1.05rem;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  padding: 1.2rem;
  border-radius: 10px;
  transition: 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #4a4a4a;
}

.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--fg-soft);
  font-size: 0.95rem;
}

.card a,
.post-list a,
.article a {
  color: var(--fg);
  text-decoration: none;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.post-item {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.post-item:last-child {
  border-bottom: none;
}

.post-meta {
  color: var(--fg-soft);
  font-size: 0.85rem;
}

.article {
  max-width: 760px;
}

.article h1,
.article h2,
.article h3 {
  line-height: 1.2;
}

blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  color: var(--fg-soft);
  margin-left: 0;
}

code {
  background: rgba(255,255,255,0.06);
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.footer {
  border-top: 1px solid var(--border);
  margin-top: 5rem;
  padding: 2rem;
  color: var(--fg-soft);
  font-size: 0.82rem;
  text-align: center;
}

.badge {
  display: inline-block;
  border: 1px solid var(--border);
  color: var(--fg-soft);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

@media (max-width: 700px) {
  .nav {
    flex-direction: column;
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2.1rem;
  }

  .container {
    padding: 1.2rem;
  }
}