:root {
  --clr-primary: #5c6ac4;
  --clr-secondary: #2e3a87;
  --clr-light: #f5f6fa;
  --clr-dark: #1e1e2f;
  --spacing: 1.5rem;
  --font-sans: 'Inter', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  color: var(--clr-dark);
  background: var(--clr-light);
  line-height: 1.6;
}

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

a:visited {
    color: var(--clr-light);
    text-decoration: none;
}

.container {
  width: min(90%, 1100px);
  margin: 0 auto;
  padding: var(--spacing) 0;
}

.site-header {
  background: white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: black;
  text-decoration: none;
}

.logo-img {
    width: 47px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing);
}

nav a {
  text-decoration: none;
  color: var(--clr-dark);
  font-weight: 600;
  transition: color .2s;
}

nav a:hover {
  color: var(--clr-primary);
}

.hero {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  color: white;
  text-align: center;
  padding: calc(var(--spacing) * 2) 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing);
}

.hero p {
  font-size: 1.1rem;
  margin-bottom: var(--spacing);
}

.btn-primary {
  display: inline-block;
  background: white;
  color: var(--clr-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  transition: background .2s, color .2s;
}

.btn-primary:hover {
  background: var(--clr-primary);
  color: white;
}

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

.features h2 {
  text-align: center;
  margin-bottom: var(--spacing);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing);
}

.feature h3 {
  color: var(--clr-primary);
  margin-bottom: .5rem;
}

.screenshots {
  background: white;
  padding: var(--spacing) 0;
}

.screenshots h2 {
  text-align: center;
  margin-bottom: var(--spacing);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing);
  padding: 0 20%;
}

.screenshots-grid img {
  width: 100%;
  border-radius: 4px;
  box-shadow: 0 3px 8px rgba(0,0,0,0.1);
}

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

.requirements h2 {
  text-align: center;
  margin-bottom: var(--spacing);
}

.requirements ul {
  list-style: disc;
  max-width: 400px;
  margin: 0 auto;
  padding-left: 1.2rem;
}

.download {
  background: var(--clr-secondary);
  color: white;
  text-align: center;
  padding: calc(var(--spacing) * 2) 0;
}

.download h2 {
  margin-bottom: var(--spacing);
}

.btn-download {
  background: white;
  color: var(--clr-secondary);
}

.site-footer {
  background: var(--clr-dark);
  color: #bbb;
  text-align: center;
  padding: var(--spacing) 0;
}

.site-footer .social {
  margin-top: .5rem;
}

.site-footer .social a {
  color: #bbb;
  margin: 0 .75rem;
  text-decoration: none;
  transition: color .2s;
}

.site-footer .social a:hover {
  color: white;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  .hero h1 { font-size: 2rem; }
  nav ul { flex-direction: column; background: white; position: absolute; right: 1rem; top: 4rem; padding: .5rem; display: none; }
  nav ul.show { display: flex; }
}