:root {
  /* Colors - Updated to match professional online course websites */
  --primary-color: #00e5ff;
  --primary-dark: #0066ff;
  --secondary-color: #6c63ff;
  --dark-bg: #0a1028;
  --darker-bg: #060a18;
  --light-bg: #1a2035;
  --light-text: #ffffff;
  --light-text-muted: rgba(255, 255, 255, 0.7);
  --card-bg: rgba(15, 20, 35, 0.8);
  --card-border: rgba(0, 229, 255, 0.2);
  --success-color: #00e676;
  --warning-color: #ffcc00;
  --error-color: #ff3d71;
  
  /* Typography */
  --body-font: 'Poppins', sans-serif;
  --code-font: 'Fira Code', monospace;
  
  /* Spacing */
  --section-padding: 5rem 0;
  --container-padding: 0 2rem;
  
  /* Shadows */
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  --button-shadow: 0 5px 15px rgba(0, 229, 255, 0.3);
  
  /* Animations */
  --transition-fast: 0.3s ease;
  --transition-medium: 0.5s ease;
  --transition-slow: 0.8s ease;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--body-font);
  background: var(--dark-bg);
  background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
  color: var(--light-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

button, .btn {
  cursor: pointer;
  font-family: var(--body-font);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
  width: 100%;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  width: 100%;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: linear-gradient(90deg, #0a1028, #0f1423);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  padding: 0.5rem 0;
}

.header.scrolled {
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  background: rgba(10, 14, 26, 0.98);
}

.logo {
  display: flex;
  align-items: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--light-text);
  position: relative;
  z-index: 10;
}

.logo-text {
  position: relative;
  display: inline-block;
  padding: 0.2rem 0;
}

/* New styles for NpTeckz branding */
.highlight-brand {
  font-size: 2rem;
  font-weight: 700;
  display: inline-block;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 15px rgba(0, 229, 255, 0.5);
  letter-spacing: 0.5px;
  position: relative;
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
}

.nav-item {
  margin: 0 1rem;
}

.nav-item:first-child {
  margin-left: 0;
}

.nav-item:last-child {
  margin-right: 0;
}

.nav-link {
  color: var(--light-text);
  font-weight: 500;
  padding: 0.5rem 0.8rem;
  position: relative;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  text-decoration: none;
}

.nav-link:hover {
  color: var(--primary-color);
  text-shadow: 0 0 5px rgba(0, 229, 255, 0.3);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0.8rem;
  width: calc(100% - 1.6rem);
  height: 2px;
  background: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-color);
  transform: scaleX(1);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.nav-link:not(.active)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0.8rem;
  width: calc(100% - 1.6rem);
  height: 2px;
  background: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-close, .nav-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--light-text);
}