:root {
  /* Color System */
  --color-true-dark: #121212;
  --color-midnight-blue: #1E1E2F;
  --color-deep-indigo: #2D2D44;
  --color-steel-violet: #3A3A5A;
  --color-crimson-accent: #E94560;
  
  /* Neutral Palette */
  --color-white: #FFFFFF;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-400: #A3A3A3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  
  /* Typography */
  --font-primary: 'Space Grotesk', sans-serif;
  --font-secondary: 'Outfit', sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */
  --font-size-4xl: 3rem;      /* 48px */
  --font-size-5xl: 3.75rem;   /* 60px */
  
  /* Spacing */
  --space-xxs: 0.25rem;  /* 4px */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 0.75rem;   /* 12px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 6rem;     /* 96px */
  
  /* Borders & Radiuses */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-index layers */
  --z-below: -1;
  --z-normal: 1;
  --z-above: 10;
  --z-modal: 100;
  --z-overlay: 1000;
}

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

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

body {
  font-family: var(--font-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-100);
  background-color: var(--color-true-dark);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  line-height: 1.2;
  margin-bottom: var(--space-md);
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-md);
}

p, ul, ol {
  margin-bottom: var(--space-lg);
}

a {
  color: var(--color-crimson-accent);
  text-decoration: none;
  transition: var(--transition-normal);
}

a:hover {
  text-decoration: underline;
}

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

/* Layout */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-3xl) 0;
}

/* Responsive Grid System */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-lg);
}

/* Header Styles - Non-sticky, unique design */
.site-header {
  position: relative;
  background-color: var(--color-midnight-blue);
  padding: var(--space-md) 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.site-header.hidden {
  transform: translateY(-100%);
  opacity: 0;
}

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

.logo {
  font-family: var(--font-primary);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-white);
  text-decoration: none;
  position: relative;
}

.logo span {
  color: var(--color-crimson-accent);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

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

.nav-item {
  margin-left: var(--space-lg);
}

.nav-link {
  font-family: var(--font-primary);
  color: var(--color-gray-200);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-link:hover {
  color: var(--color-white);
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-crimson-accent);
  transition: width var(--transition-normal);
}

.nav-link:hover::after {
  width: 100%;
}

/* Burger Menu - Animated Version */
.burger-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  width: 40px;
  height: 40px;
  position: relative;
  z-index: var(--z-above);
  transition: var(--transition-normal);
}

.burger-icon {
  position: relative;
  width: 24px;
  height: 20px;
  margin: 0 auto;
}

.burger-icon span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  border-radius: 2px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: var(--transition-normal);
}

.burger-icon span:nth-child(1) {
  top: 0px;
}

.burger-icon span:nth-child(2), .burger-icon span:nth-child(3) {
  top: 9px;
}

.burger-icon span:nth-child(4) {
  top: 18px;
}

.burger-menu.active .burger-icon span:nth-child(1) {
  top: 9px;
  width: 0%;
  left: 50%;
}

.burger-menu.active .burger-icon span:nth-child(2) {
  transform: rotate(45deg);
}

.burger-menu.active .burger-icon span:nth-child(3) {
  transform: rotate(-45deg);
}

.burger-menu.active .burger-icon span:nth-child(4) {
  top: 9px;
  width: 0%;
  left: 50%;
}

.menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(18, 18, 18, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: var(--z-modal);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
}

.btn-primary {
  background-color: var(--color-crimson-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #d03b53;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-steel-violet);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #444478;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-true-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn i {
  margin-right: var(--space-xs);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  background-color: var(--color-deep-indigo);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-title {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-lg);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xl);
  color: var(--color-gray-300);
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
}

.hero-graphics {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 50%;
  background-color: var(--color-midnight-blue);
  clip-path: polygon(15% 0, 100% 0, 100% 100%, 0% 100%);
}

/* Feature Cards */
.feature-card {
  background-color: var(--color-midnight-blue);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: var(--transition-normal);
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--color-crimson-accent);
  margin-bottom: var(--space-md);
}

.feature-title {
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-lg);
}

/* Course Cards */
.course-card {
  background-color: var(--color-midnight-blue);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.course-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.course-content {
  padding: var(--space-lg);
}

.course-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.course-meta {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-md);
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
}

.course-meta i {
  margin-right: var(--space-xs);
}

.course-meta-item {
  display: flex;
  align-items: center;
  margin-right: var(--space-md);
}

.course-price {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--color-crimson-accent);
  margin-top: var(--space-md);
}

/* Contact Form */
.contact-form {
  background-color: var(--color-midnight-blue);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: var(--space-sm);
  font-family: var(--font-secondary);
  font-size: var(--font-size-base);
  color: var(--color-gray-900);
  background-color: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-steel-violet);
  box-shadow: 0 0 0 3px rgba(58, 58, 90, 0.25);
}

.form-check {
  display: flex;
  align-items: flex-start;
}

.form-check-input {
  margin-right: var(--space-sm);
  margin-top: 0.3rem;
}

.form-check-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-300);
}

/* Footer */
.site-footer {
  background-color: var(--color-midnight-blue);
  padding: var(--space-xl) 0;
  font-size: var(--font-size-sm);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-xl);
}

.footer-branding {
  flex: 1;
  min-width: 250px;
}

.footer-branding .logo {
  margin-bottom: var(--space-md);
  display: inline-block;
}

.footer-nav {
  flex: 1;
  min-width: 200px;
}

.footer-heading {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-md);
}

.footer-list {
  list-style: none;
}

.footer-list li {
  margin-bottom: var(--space-xs);
}

.footer-link {
  color: var(--color-gray-300);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-contact {
  flex: 1;
  min-width: 200px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
}

.contact-icon {
  font-size: var(--font-size-md);
  color: var(--color-crimson-accent);
  margin-right: var(--space-sm);
  flex-shrink: 0;
}

.footer-bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-deep-indigo);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copyright {
  color: var(--color-gray-400);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--color-white);
  background-color: var(--color-deep-indigo);
  transition: var(--transition-normal);
}

.social-link:hover {
  background-color: var(--color-crimson-accent);
  transform: translateY(-2px);
}

/* Cookie Policy Popup */
.cookie-popup {
  position: fixed;
  bottom: var(--space-md);
  left: var(--space-md);
  right: var(--space-md);
  padding: var(--space-lg);
  background-color: var(--color-midnight-blue);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-overlay);
  display: none;
}

.cookie-popup.active {
  display: block;
}

.cookie-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.cookie-text {
  flex: 1;
}

.cookie-text p {
  margin-bottom: 0;
}

.cookie-buttons {
  display: flex;
  gap: var(--space-sm);
}

/* Animations */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.slide-up {
  animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* 404 Page */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.error-code {
  font-size: var(--font-size-5xl);
  font-weight: 900;
  color: var(--color-crimson-accent);
  margin-bottom: var(--space-md);
}

.error-message {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-xl);
}

/* Media queries for responsive design */
@media (max-width: 1200px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
}

@media (max-width: 992px) {
  .grid {
    grid-template-columns: repeat(6, 1fr);
  }
  
  .hero {
    min-height: 60vh;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-graphics {
    width: 40%;
  }
}

@media (max-width: 768px) {
  .nav-list {
    display: block;
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background-color: var(--color-deep-indigo);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px var(--space-lg) var(--space-lg);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
    z-index: var(--z-modal);
    transition: right var(--transition-normal);
  }
  
  .nav-list.active {
    right: 0;
  }
  
  .nav-item {
    margin: var(--space-md) 0;
    width: 100%;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: calc(var(--item-index, 0) * 0.05s);
  }
  
  .nav-list.active .nav-item {
    opacity: 1;
    transform: translateX(0);
  }
  
  .menu-overlay.active {
    display: block;
    opacity: 1;
  }
  
  .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-xs) 0;
    font-size: var(--font-size-md);
  }
  
  .burger-menu {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .hero-content {
    text-align: center;
    margin: 0 auto;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-graphics {
    display: none;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-xl);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 576px) {
  :root {
    --font-size-5xl: 3rem;
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.75rem;
    --font-size-xl: 1.5rem;
    --font-size-lg: 1.25rem;
  }
  
  .container {
    padding: 0 var(--space-sm);
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-md);
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
  
  .cookie-content {
    flex-direction: column;
    text-align: center;
  }
  
  .cookie-buttons {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 320px) {
  .container {
    padding: 0 var(--space-xs);
  }
  
  :root {
    --font-size-base: 0.875rem;
  }
}