/* ----------  CSS CUSTOM PROPERTIES  ---------- */
:root {
  /* light */
  --bg: #ffffff;
  --txt: #111111;
  --border: #e0e0e0;
  --tag-bg: #111111;
  --tag-txt: #ffffff;
  --hover: #f5f5f5;
}

body.dark-mode {
  /* dark */
  --bg: #111111;
  --txt: #ffffff;
  --border: #333333;
  --tag-bg: #ffffff;
  --tag-txt: #111111;
  --hover: #222222;
}

/* ----------  RESET + TYPOGRAPHY  ---------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0
}

html {
  scroll-behavior: smooth
}

body {
  font-family: 'Space Mono', monospace;
  background: var(--bg);
  color: var(--txt);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem
}

p {
  line-height: 1.7;
  margin-bottom: 1rem
}

/* ----------  LAYOUT HELPERS  ---------- */
.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
}

main {
  flex: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
}

/* ----------  HEADER / NAV  ---------- */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  padding: 1.5rem 0
}

nav {
  display: flex;
  align-items: center
}

nav a {
  color: var(--txt);
  text-decoration: none;
  padding: 1.5rem;
  border-left: 1px solid var(--border);
  transition: background-color .2s;
}

nav a:hover {
  background: var(--hover)
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 1.5rem;
  border-left: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--hover)
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  fill: var(--txt)
}

/* ----------  FOOTER  ---------- */
footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--border);
}

footer a {
  text-align: center;
  padding: 1.5rem;
  color: var(--txt);
  text-decoration: none;
  transition: background-color .2s;
}

footer a:hover {
  background: var(--hover)
}

footer a:first-child {
  border-right: 1px solid var(--border)
}

/* ----------  TAGS  ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-txt);
  padding: .5rem 1rem;
  font-size: .8rem;
}

/* ----------  RESPONSIVE  ---------- */
@media(max-width:768px) {
  header {
    flex-direction: column;
    padding: 0 1rem
  }

  .logo {
    text-align: center;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1rem 0
  }

  nav {
    width: 100%;
    justify-content: center
  }

  nav a {
    flex: 1;
    text-align: center;
    padding: 1rem
  }

  nav a:first-child {
    border-left: none
  }

  main {
    padding: 2rem
  }
}

@media(max-width:480px) {
  nav {
    flex-direction: column
  }

  nav a,
  .theme-toggle {
    border-left: none;
    border-top: 1px solid var(--border)
  }

  footer {
    grid-template-columns: 1fr
  }

  footer a:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border)
  }
}