/* CSS Variables Interactive Example Styles */
:root {
  --main-bg: #f0f4ff;
  --accent: #3498db;
  --radius: 12px;
  --theory-bg: #f9fafc;
  --code-bg: #23272e;
  --code-color: #e3e8ef;
  --accent-hover: #217dbb;
  --demo-bg: #fff;
  --subtitle: #555;
  --theme-bg: #f0f0f0;
  --theme-text: #333;
  --accent-rgb: 52, 152, 219;
  --border-color-light: #e0e6ef;
  --card-border-color: #dbeafe;
  --resources-accent: #8e44ad;
  --fallback-color: #e74c3c;
  --fallback-bg: #fff5f5;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--main-bg);
  margin: 0;
  color: #222;
  line-height: 1.7;
}

nav {
  margin: 0;
  padding: 1rem 2rem 0 2rem;
}

.back-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-weight: 500;
  transition: background 0.2s;
}
.back-btn:hover {
  background: var(--accent-hover);
}

main {
  max-width: 820px;
  margin: 2rem auto;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(var(--accent-rgb), 0.08);
  padding: 2.5rem 2rem 2rem 2rem;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}
.subtitle {
  color: var(--subtitle);
  font-size: 1.2rem;
  margin-top: 0.5rem;
}

section.theory {
  background: var(--theory-bg);
  border-left: 4px solid var(--accent);
  padding: 1.2rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: 8px;
}
section.theory h2 {
  margin-top: 0;
}

section.example {
  margin-bottom: 2.5rem;
}
.code-demo {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-start;
}
.code-block {
  background: var(--code-bg);
  color: var(--code-color);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  font-size: 1rem;
  min-width: 260px;
  max-width: 350px;
  overflow-x: auto;
  flex: 1 1 260px;
}
.code-block code {
  font-family: 'Fira Mono', 'Consolas', monospace;
  font-size: 1em;
  color: inherit;
}
.live-demo {
  background: var(--demo-bg);
  border: 1px solid var(--border-color-light);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  min-width: 220px;
  flex: 1 1 220px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.box {
  background: var(--main-bg);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  padding: 1rem 2rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}
.theme-light {
  --theme-bg: #fff;
  --theme-text: #222;
}
.theme-dark {
  --theme-bg: #222;
  --theme-text: #fff;
}
.card {
  background: var(--theme-bg);
  color: var(--theme-text);
  padding: 1rem 2rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  border: 1px solid var(--card-border-color);
  box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.06);
}
.fallback-demo {
  color: var(--not-set, var(--fallback-color));
  font-size: 1.2rem;
  padding: 0.5rem 1rem;
  border: 1px dashed var(--not-set, var(--fallback-color));
  border-radius: 6px;
  background: var(--fallback-bg);
}
.resources {
  margin-top: 2.5rem;
  padding: 1.2rem 1.5rem;
  background: #f6fafd;
  border-radius: 8px;
  border-left: 4px solid var(--resources-accent);
}
.resources h2 {
  margin-top: 0;
}
.resources ul {
  margin: 0;
  padding-left: 1.2em;
}
@media (max-width: 700px) {
  main {
    padding: 1rem 0.5rem;
  }
  .code-demo {
    flex-direction: column;
    gap: 0.5rem;
  }
}