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

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f9f9f9;
}

/* Layout */
.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
  padding: 20px 0;
}

/* Header */
header {
  background: #222;
  color: #fff;
  padding: 1rem 0;
}

.logo {
  float: left;
  font-size: 1.8rem;
  font-weight: bold;
}

nav {
  float: right;
}

nav a {
  color: #fff;
  margin-left: 20px;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav a:hover,
nav a.active {
  color: #00bcd4;
}

header::after {
  content: "";
  display: table;
  clear: both;
}

/* Hero Section */
.hero {
  background: linear-gradient(to right, #00bcd4, #2196f3);
  color: #fff;
  padding: 4rem 0;
  text-align: center;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

/* Buttons */
.btn {
  display: inline-block;
  background: #00bcd4;
  color: #fff;
  padding: 10px 20px;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.3s ease;
}

.btn:hover {
  background: #0097a7;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  background: #fff;
  padding: 1.5rem;
  border-radius: 6px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-5px);
}

/* Timeline */
.timeline {
  list-style: none;
  margin-top: 2rem;
  padding-left: 0;
}

.timeline li {
  background: #fff;
  margin-bottom: 1rem;
  padding: 1rem;
  border-left: 4px solid #00bcd4;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

/* Footer */
footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1rem 0;
  margin-top: 3rem;
}

/* Error Page */
.error-page {
  text-align: center;
  padding: 5rem 2rem;
}

.error-page h1 {
  font-size: 6rem;
  color: #2196f3;
}

.error-page p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}