:root {
  --bg-color: #0f1115;
  --bg-secondary: #161b22;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent-color: #58a6ff;
  --accent-hover: #79c0ff;
  --border-color: #30363d;
  --code-bg: #0d1117;
  --card-bg: #161b22;
  --success-color: #238636;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header & Nav */
header {
  background-color: rgba(22, 27, 34, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent-color);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, #58a6ff, #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 2rem;
}

.badges {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.badges img {
  height: 20px;
}

/* Sponsors */
.sponsors {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0 4rem;
}

.sponsor-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.sponsor-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color);
}

/* Main Layout */
.main-content {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 3rem;
  padding: 2rem 0 4rem;
  position: relative;
}

/* Sidebar */
aside {
  position: sticky;
  top: 100px;
  height: calc(100vh - 100px);
  overflow-y: auto;
}

.toc h3 {
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  letter-spacing: 1px;
}

.toc ul {
  list-style: none;
  border-left: 2px solid var(--border-color);
}

.toc li {
  margin-bottom: 0.5rem;
}

.toc a {
  display: block;
  padding-left: 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: all 0.2s;
}

.toc a:hover, .toc a.active {
  color: var(--accent-color);
  border-left-color: var(--accent-color);
}

/* Content Sections */
.section-title {
  font-size: 2rem;
  margin: 3rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.subsection-title {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
}

.prompt-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.prompt-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.prompt-description {
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 1rem;
}

.prompt-image {
  width: 100%;
  max-width: 500px;
  border-radius: 8px;
  margin-bottom: 1rem;
  display: block;
}

.code-block-wrapper {
  position: relative;
  background: var(--code-bg);
  padding: 1.5rem;
  overflow-x: auto;
}

.code-block-wrapper pre {
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: pre-wrap;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.source-link {
  display: block;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
}

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

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.active {
    display: flex;
  }

  .main-content {
    grid-template-columns: 1fr;
  }

  aside {
    display: none; /* Hide TOC on mobile for now, or move it */
  }

  .hero h1 {
    font-size: 2rem;
  }
}