/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #4a5568;
  --secondary-color: #718096;
  --accent-color: #5a67d8;
  --background-color: #f7fafc;
  --text-color: #2d3748;
  --border-color: #e2e8f0;
  --header-bg: #ffffff;
  --footer-bg: #2d3748;
  --footer-text: #cbd5e0;
  --link-hover: #3c4fd6;
  --max-width: 1200px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

a {
  text-decoration: none;
  color: var(--accent-color);
  transition: color 0.3s ease;
}

a:hover {
  color: var(--link-hover);
}

/* Header Styles */
header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

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

.site-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-color);
}

.site-title a {
  color: var(--primary-color);
}

/* Navigation Styles */
.nav-wrapper {
  display: flex;
  align-items: center;
  gap: 2rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

nav a {
  color: var(--secondary-color);
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

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

/* Language Switcher */
.language-switcher {
  position: relative;
}

.lang-button {
  background-color: transparent;
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  color: var(--secondary-color);
  font-weight: 500;
  transition: all 0.3s ease;
}

.lang-button:hover {
  background-color: var(--background-color);
  border-color: var(--accent-color);
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--header-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-top: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  min-width: 150px;
  display: none;
}

/* Show language menu when checkbox is checked (desktop) */
.lang-toggle-checkbox:checked ~ .lang-menu {
  display: block;
}

.lang-menu a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--secondary-color);
  border-bottom: 1px solid var(--border-color);
}

.lang-menu a:last-child {
  border-bottom: none;
}

.lang-menu a:hover {
  background-color: var(--background-color);
  color: var(--accent-color);
}

/* Mobile Menu Toggle - CSS Only (Checkbox Hack) */
.menu-toggle-checkbox {
  display: none;
}

.menu-toggle-label {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary-color);
  padding: 0.5rem;
  user-select: none;
}

.lang-toggle-checkbox {
  display: none;
}

/* Main Content Styles */
main {
  max-width: var(--max-width);
  margin: 2rem auto;
  padding: 0 1rem;
  min-height: calc(100vh - 200px);
}

.content-section {
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  margin-bottom: 2rem;
}

.content-section h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.content-section h2 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

.content-section p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

.content-section ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-section li {
  margin-bottom: 0.5rem;
}

/* Language Selection Page */
.language-selection {
  text-align: center;
  padding: 3rem 1rem;
}

.language-selection h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.language-selection p {
  font-size: 1.1rem;
  color: var(--secondary-color);
  margin-bottom: 2rem;
}

.language-options {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.language-option {
  display: inline-block;
  padding: 1.5rem 3rem;
  background-color: var(--accent-color);
  color: #ffffff;
  border-radius: 8px;
  font-size: 1.2rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.language-option:hover {
  background-color: var(--link-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
  color: #ffffff;
}

.language-note {
  margin-top: 2rem;
  font-size: 0.95rem;
  color: var(--secondary-color);
}

/* Footer Styles */
footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding: 2rem 0 1rem;
  margin-top: 4rem;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--footer-text);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: #ffffff;
}

.copyright {
  text-align: center;
  font-size: 0.9rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

  .nav-wrapper {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--header-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 4rem 1rem 1rem;
    gap: 0;
    transition: left 0.3s ease;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    z-index: 999;
  }

  /* Show menu when checkbox is checked */
  .menu-toggle-checkbox:checked ~ .nav-wrapper {
    left: 0;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  nav li {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

  nav a {
    display: block;
    padding: 1rem;
    width: 100%;
  }

  .language-switcher {
    width: 100%;
    padding: 1rem 0;
  }

  .lang-button {
    display: block;
    width: 100%;
    text-align: left;
  }

  .lang-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-top: 1px solid var(--border-color);
    margin-top: 0;
    display: none;
  }

  /* Show language menu when checkbox is checked */
  .lang-toggle-checkbox:checked ~ .lang-menu {
    display: block;
  }

  .content-section {
    padding: 1.5rem;
  }

  .content-section h1 {
    font-size: 1.75rem;
  }

  .language-selection h1 {
    font-size: 2rem;
  }

  .language-options {
    flex-direction: column;
    gap: 1rem;
  }

  .language-option {
    padding: 1.25rem 2rem;
  }

  .footer-links {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0 0.75rem;
  }

  .site-title {
    font-size: 1.25rem;
  }

  .content-section {
    padding: 1rem;
  }

  .content-section h1 {
    font-size: 1.5rem;
  }

  .content-section h2 {
    font-size: 1.25rem;
  }
}