/* Mark Loewinsohn - Main Styles */
/* Black/white/red minimal aesthetic */

:root {
  --black: #000;
  --white: #fff;
  --red: #D32F2F;
  --gray-light: #f5f5f5;
  --gray-dark: #333;
  --font-ui: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Roboto Mono', monospace;
}

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

html {
  font-size: 16px;
}

body {
  font-family: var(--font-ui);
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
}

/* Header & Navigation */
header {
  border-bottom: 1px solid var(--black);
  padding: 1rem 2rem;
}

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--black);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--black);
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--red);
}

/* Main Content */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  text-decoration: none;
}

/* Lists */
ul, ol {
  margin: 1rem 0 1rem 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

.page-list {
  list-style: none;
  margin-left: 0;
}

.page-list li {
  margin-bottom: 1rem;
}

.page-list a {
  font-size: 1.125rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--black);
  padding: 0.5rem 0;
  display: inline-block;
  border-bottom: 1px solid transparent;
}

.page-list a:hover {
  border-bottom-color: var(--red);
}

/* Intro */
.intro {
  font-size: 1.25rem;
  color: var(--gray-dark);
  margin-bottom: 2rem;
}

/* Section Links (home page) */
.sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.section-link {
  display: block;
  padding: 1.5rem;
  border: 1px solid var(--black);
  text-decoration: none;
  color: var(--black);
  transition: background-color 0.2s;
}

.section-link:hover {
  background-color: var(--gray-light);
}

.section-link h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.section-link p {
  margin: 0;
  color: var(--gray-dark);
}

/* Video Container - Responsive YouTube Embeds */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin: 1.5rem 0;
  background: var(--black);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
}

/* Code */
code {
  font-family: var(--font-mono);
  background: var(--gray-light);
  padding: 0.125rem 0.375rem;
  font-size: 0.875rem;
}

pre {
  font-family: var(--font-mono);
  background: var(--gray-light);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

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

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-light);
}

th {
  font-weight: 600;
  border-bottom: 2px solid var(--black);
}

/* Footer */
footer {
  border-top: 1px solid var(--black);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--gray-dark);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    padding: 1rem;
  }

  .main-nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }

  main {
    padding: 2rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .sections {
    grid-template-columns: 1fr;
  }
}