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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #333;
}

.container {
  width: 100%;
  max-width: 900px;
  padding: 20px;
}

/* Login Box */
.login-box {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  max-width: 400px;
  margin: 0 auto;
}

.login-box h1 {
  text-align: center;
  margin-bottom: 30px;
  color: #667eea;
}

.login-box input {
  width: 100%;
  padding: 12px;
  margin-bottom: 15px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
}

.login-box button {
  width: 100%;
  padding: 12px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s;
}

.login-box button:hover {
  background: #5568d3;
}

#error-message {
  color: #e74c3c;
  margin-top: 10px;
  text-align: center;
  font-size: 14px;
}

.register-link {
  text-align: center;
  margin-top: 20px;
  color: #666;
  font-size: 14px;
}

.register-link a {
  color: #667eea;
  text-decoration: none;
  font-weight: 600;
}

/* Dashboard */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

header h1 {
  color: #667eea;
}

#logout-btn {
  background: #e74c3c;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.3s;
}

#logout-btn:hover {
  background: #c0392b;
}

/* App Grid */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.app-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  text-decoration: none;
  color: #333;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.app-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.app-card .icon {
  font-size: 48px;
  display: block;
  margin-bottom: 15px;
}

.app-card h3 {
  margin-bottom: 10px;
  color: #667eea;
}

.app-card p {
  color: #666;
  font-size: 14px;
}