/* -----------------------------------
   Root Variables (Design Tokens)
----------------------------------- */
:root {
  --font-family: system-ui, sans-serif;

  --color-text: #222;
  --color-bg: #f5f5f5;
  --color-link: #0077cc;
  --color-link-hover: #005fa3;

  --color-header-bg: #222;
  --color-footer-bg: #222;
  --color-nav-hover: #444;

  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.05);
  --color-muted: #888;

  --color-highlight: #4da6ff;
  --color-subtitle: #ccc;

  --color-dark-bg: #121212;
  --color-dark-card-bg: #1e1e1e;
  --color-dark-hover: #333;
  --color-text-light: #eee;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--color-link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* -----------------------------------
   Utilities
----------------------------------- */
.hidden {
  display: none;
}

.fade-in {
  animation: fadeIn 1s ease-in forwards;
  opacity: 0;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

/* -----------------------------------
   Header & Site Title
----------------------------------- */
.header {
  background-color: var(--color-header-bg);
  color: white;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.site-title {
  text-align: center;
  padding: 1.5rem 0;
}

.site-title h1 {
  font-size: 2.2rem;
  color: white;
  margin-bottom: 0.3rem;
}

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

.subtitle {
  font-size: 0.95rem;
  color: var(--color-subtitle);
}

/* -----------------------------------
   Navbar
----------------------------------- */
.navbar {
  position: relative;
  width: 100%;
}

.nav-toggle {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  display: block;
  margin: 0.5rem auto;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
}

.nav-links li a {
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 5px;
}

.nav-links li a.active,
.nav-links li a:hover {
  background-color: var(--color-nav-hover);
}

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

/* -----------------------------------
   Main Content & Cards
----------------------------------- */
.main-content {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
}

.card {
  background-color: var(--color-card-bg);
  border-radius: 10px;
  box-shadow: 0 2px 8px var(--color-card-shadow);
  margin-bottom: 2rem;
  padding: 1.5rem;
}

.card h2 {
  margin-bottom: 0.5rem;
}

.card .date {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

/* -----------------------------------
   Language Toggle
----------------------------------- */
.lang-toggle-wrapper {
  text-align: center;
  margin-bottom: 1.5rem;
}

.lang-toggle {
  background-color: var(--color-link);
  color: white;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}

.lang-toggle:hover {
  background-color: var(--color-link-hover);
}

/* -----------------------------------
   Footer
----------------------------------- */
.footer {
  text-align: center;
  padding: 1rem;
  background-color: var(--color-footer-bg);
  color: white;
  position: relative;
}

.footer button {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: white;
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
}

/* -----------------------------------
   Dark Mode
----------------------------------- */
body.dark {
  background-color: var(--color-dark-bg);
  color: var(--color-text-light);
}

body.dark .card {
  background-color: var(--color-dark-card-bg);
}

body.dark .footer,
body.dark .header {
  background-color: black;
}

body.dark .nav-links li a:hover {
  background-color: var(--color-dark-hover);
}

/* -----------------------------------
   Responsive Layout (Desktop)
----------------------------------- */
@media (min-width: 769px) {
  .header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }

  .nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex !important;
    flex-direction: row;
    justify-content: flex-end;
    align-items: center;
    gap: 1rem;
    padding: 0;
  }

  .site-title {
    text-align: left;
    padding: 0;
  }
}