/* style.css */
:root {
  --color-bg: #111;
  --color-text: #e0e0e0;
  --color-primary: #00aaff;
  --color-header: #1a1a1a;
  --color-border: #333;
}

html {
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

body {
  margin: 0;
  padding: 0;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

/* Header & Navigation */
.header {
  background-color: var(--color-header);
  border-bottom: 1px solid var(--color-border);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8em;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
}

.logo span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 1em;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--color-primary);
}

/* Main Content */
main {
  padding: 40px 0;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.3;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 {
  font-size: 2.8em;
  color: #fff;
}

h2 {
  font-size: 2.0em;
  color: #f5f5f5;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 5px;
}

h3 {
  font-size: 1.5em;
  color: var(--color-primary);
}

p, li {
  font-size: 1.1em;
  margin-bottom: 1.2em;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 20px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 30px 0;
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
  color: #888;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 25px;
  margin-bottom: 10px;
}

.footer-nav a {
  color: #aaa;
  font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }

  .header .container {
    flex-direction: column;
    gap: 10px;
  }

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

  h1 {
    font-size: 2.4em;
  }

  h2 {
    font-size: 1.8em;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.6em;
  }

  h1 {
    font-size: 2.0em;
  }

  h2 {
    font-size: 1.6em;
  }

  p, li {
    font-size: 1.0em;
  }

  .footer-nav {
    flex-direction: column;
    gap: 10px;
  }
}