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

:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-dark-gray: #1a1a1a;
  --color-medium-gray: #333333;
  --color-light-gray: #e5e5e5;
  --color-lighter-gray: #f5f5f5;
  --color-border: #cccccc;

  --font-primary:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  --font-mono: "Monaco", "Menlo", "Ubuntu Mono", monospace;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1.2rem;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  --transition-fast: 150ms ease-in-out;
  --transition-standard: 250ms ease-in-out;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: #ffffff;
  color: #000000;
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 3rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
}

code {
  font-family: var(--font-mono);
  background-color: #f0f0f0;
  color: #333333;
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  width: 100%;
}
.meta {
  font-size: 0.875rem;
  color: #666666;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}
a {
  color: #000000;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
  position: relative;
}

a:hover {
  color: #333333;
}

a:focus {
  outline: 2px solid #000000;
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.site-header {
  position: sticky;
  top: 0;
  background-color: #ffffff;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.site-header strong {
  font-size: 1.5rem;
  font-weight: 700;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.site-header .meta {
  margin-bottom: 0.25rem;
}

/* Navigation */
nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

nav a {
  font-weight: 500;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.25rem;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast);
}

nav a:hover {
  border-bottom-color: #000000;
}

nav a:focus {
  outline: 2px solid #000000;
  outline-offset: 4px;
}

main {
  min-height: calc(100vh - 140px);
}

.hero {
  padding: var(--spacing-2xl) 0;
  background: #ffffff;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero .panel {
  padding: var(--spacing-xl);
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  transition:
    box-shadow var(--transition-standard),
    transform var(--transition-standard),
    background-color var(--transition-fast);
}

.hero h1 {
  margin-bottom: var(--spacing-lg);
  color: #000000;
}

.hero p {
  color: #333333;
  margin-bottom: var(--spacing-lg);
}

.hero aside {
  background-color: #000000;
  color: #ffffff;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 2px solid #000000;
}

.hero aside h2 {
  color: #ffffff;
  margin-bottom: var(--spacing-md);
}

.hero aside p {
  color: #e5e5e5;
  margin-bottom: 0;
}

.hero aside code {
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.cta {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: #000000;
  color: #ffffff;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition:
    background-color var(--transition-standard),
    color var(--transition-standard),
    transform var(--transition-standard),
    box-shadow var(--transition-standard),
    border-color var(--transition-standard);
  border: 2px solid #000000;
  cursor: pointer;
  position: relative;
}

.cta:hover {
  background-color: #ffffff;
  color: #000000;
  border-color: #000000;
  transform: translateY(-4px) scale(1.02);
}

.cta:active {
  transform: translateY(-2px) scale(0.98);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.cta:focus {
  outline: 2px solid #000000;
  outline-offset: 2px;
}

.content {
  padding: var(--spacing-2xl) 0;
  background-color: #ffffff;
}

.content .container {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: var(--spacing-2xl);
}

.articles {
  display: grid;
  gap: var(--spacing-xl);
}

.articles h2 {
  grid-column: 1 / -1;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid #000000;
}

article {
  padding: var(--spacing-lg);
  background-color: #ffffff;
  border: 2px solid #000000;
  border-radius: var(--radius-lg);
  transition:
    box-shadow var(--transition-standard),
    background-color var(--transition-standard);
}

article:hover {
  box-shadow: var(--shadow-md);
  background-color: #f9f9f9;
}

article header {
  margin-bottom: var(--spacing-md);
}

article h3 {
  margin-bottom: var(--spacing-md);
  color: #000000;
}

article p {
  color: #333333;
  margin-bottom: 0;
}

aside {
  background-color: #000000;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 2px solid #000000;
  height: fit-content;
  position: sticky;
  top: 100px;
  color: #ffffff;
}

aside h2 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: #ffffff;
}

aside p {
  color: #e5e5e5;
  font-size: 0.95rem;
  margin-bottom: 0;
}

footer {
  background-color: #000000;
  color: #cccccc;
  padding: var(--spacing-xl) 0;
  border-top: 2px solid #333333;
  margin-top: var(--spacing-2xl);
}

footer p {
  margin: 0;
  font-size: 0.95rem;
}

footer p:first-child {
  font-weight: 500;
  color: #ffffff;
  margin-bottom: var(--spacing-sm);
}

footer a {
  color: #cccccc;
  transition: color var(--transition-fast);
}

footer a:hover {
  color: #ffffff;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-md);
  }

  nav ul {
    gap: var(--spacing-md);
    flex-direction: column;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

  aside {
    position: static;
  }

  .hero .panel,
  .hero aside {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .site-header .container {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  nav ul {
    gap: var(--spacing-sm);
    font-size: 0.9rem;
  }

  .hero,
  .content {
    padding: var(--spacing-xl) 0;
  }

  .cta {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.95rem;
  }
}

@media print {
  body {
    background-color: #ffffff;
  }

  .site-header,
  footer {
    display: none;
  }

  a {
    text-decoration: underline;
  }

  article,
  .hero .panel {
    page-break-inside: avoid;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}