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

body {
  font-family: 'Segoe UI', sans-serif;
  background: #fff;
  color: #222;
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

header {
  background: #f8f9fa;
  padding: 15px 0;
  border-bottom: 1px solid #e1e1e1;
}

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

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #1a73e8;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #444;
  font-weight: 500;
}

nav .btn {
  background: #1a73e8;
  color: #fff;
  padding: 8px 14px;
  border-radius: 5px;
}

.hero {
  background: #e9f1fd;
  padding: 60px 20px;
  text-align: center;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 15px;
  color: #1a73e8;
}

.hero p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.btn.primary {
  background: #34a853;
  color: #fff;
  padding: 10px 18px;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
}

.section {
  padding: 60px 0;
  text-align: center;
}

.features-grid {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.feature-box {
  background: #f1f1f1;
  padding: 30px;
  border-radius: 8px;
  width: 200px;
  box-shadow: 0 0 5px rgba(0,0,0,0.05);
  font-size: 1.1rem;
}

.about p {
  max-width: 700px;
  margin: auto;
}

footer {
  background: #f8f9fa;
  text-align: center;
  padding: 15px 0;
  font-size: 0.9rem;
  color: #666;
  border-top: 1px solid #e1e1e1;
}
footer a {
  color: #1a73e8;
  text-decoration: none;
}
.sidebar-hidden {
  display: none;
}

.sidebar-visible {
  display: block;
}
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 250px;
  height: 100%;
  background: #f8f9fa;
  box-shadow: 2px 0 5px rgba(0,0,0,0.1);
  padding: 20px;
}