/* Base styles and variables */
:root {
  /* Color system */
  --color-primary: #3066BE;
  --color-primary-light: #60AFFF;
  --color-primary-dark: #254D91;
  --color-secondary: #60AFFF;
  --color-accent: #F26419;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  
  --color-text-dark: #1F2937;
  --color-text-medium: #4B5563;
  --color-text-light: #9CA3AF;
  --color-text-white: #FFFFFF;
  
  --color-background-light: #FFFFFF;
  --color-background-off: #F9FAFB;
  --color-background-dark: #111827;
  
  /* Spacing system (based on 8px) */
  --space-1: 0.5rem;   /* 8px */
  --space-2: 1rem;     /* 16px */
  --space-3: 1.5rem;   /* 24px */
  --space-4: 2rem;     /* 32px */
  --space-5: 2.5rem;   /* 40px */
  --space-6: 3rem;     /* 48px */
  
  /* Typography */
  --font-family: 'Inter', sans-serif;
  --line-height-body: 1.5;
  --line-height-heading: 1.2;
  
  /* Border radius */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 1rem;     /* 16px */
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Header height for scroll offset */
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height-body);
  color: var(--color-text-dark);
  background-color: var(--color-background-light);
}

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

ul {
  list-style: none;
}

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

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-2);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: var(--space-1) 0;
  height: var(--header-height);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: block;
  height: 40px;
}

.logo img {
  height: 100%;
  width: auto;
}

.nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  gap: var(--space-3);
}

.nav-link {
  color: var(--color-text-dark);
  font-weight: 500;
  position: relative;
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

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

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
}

.mobile-menu-toggle span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: var(--color-text-dark);
  border-radius: 2px;
  left: 0;
  transition: var(--transition-medium);
}

.mobile-menu-toggle span:nth-child(1) {
  top: 0;
}

.mobile-menu-toggle span:nth-child(2) {
  top: 10px;
}

.mobile-menu-toggle span:nth-child(3) {
  top: 20px;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 500px;
  background-image: url('/images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  color: var(--color-text-white);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.4));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero h1 {
  font-size: 3.5rem;
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-2);
  font-weight: 700;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
  max-width: 600px;
  opacity: 0.9;
}

/* Main Content */
.main-content {
  padding: var(--space-6) 0;
}

.content-section {
  margin-bottom: var(--space-6);
  padding-top: var(--space-3);
}

.content-section h2 {
  font-size: 2rem;
  color: var(--color-text-dark);
  margin-bottom: var(--space-3);
  position: relative;
  padding-bottom: var(--space-1);
}

.content-section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--color-primary);
}

.content-section p {
  margin-bottom: var(--space-2);
  color: var(--color-text-medium);
}

/* Language Section */
.language-section {
  padding: var(--space-6) 0;
  background-color: var(--color-background-off);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
}

.language-section h2 {
  text-align: center;
  margin-bottom: var(--space-4);
}

.lang-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2);
  padding: 0 var(--space-2);
}

.lang-card {
  background-color: var(--color-primary);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--color-text-white);
  font-weight: 500;
  transition: all var(--transition-medium);
}

.lang-card:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* Footer */
.footer {
  background-color: var(--color-background-dark);
  color: var(--color-text-white);
  padding: var(--space-4) 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-logo {
  max-width: 120px;
  margin-bottom: var(--space-2);
}

.copyright {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .content-section h2 {
    font-size: 1.8rem;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero {
    height: 70vh;
  }
  
  .hero h1 {
    font-size: 2.3rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .content-section h2 {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .header-content {
    height: 100%;
  }
  
  .logo {
    height: 32px;
  }
  
  .hero {
    height: 60vh;
    min-height: 400px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .footer-logo {
    max-width: 100px;
  }

  .lang-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}