/* ===== BASE STYLES ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #1e293b;
    --light: #f8fafc;
    --dark: #0f172a;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --white: #ffffff;
    --max-width: 1200px;
    --border-radius: 0.5rem;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
    font-size: 100%;
  }
  
  body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--light);
  }
  
  /* Fluid typography */
  h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
  h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
  h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
  p, li, a { font-size: clamp(1rem, 2vw, 1.125rem); }
  
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }
  
  /* ===== REUSABLE COMPONENTS ===== */
  .container {
    width: min(90%, var(--max-width));
    margin-inline: auto;
    padding-inline: 1rem;
  }
  
  .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
  }
  
  .btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
  }
  
  .section {
    padding-block: 4rem;
  }
  
  .section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }
  
  .section-title::after {
    content: '';
    display: block;
    width: 5rem;
    height: 0.25rem;
    background: var(--primary);
    margin: 1rem auto;
  }
  
  /* ===== LAYOUT COMPONENTS ===== */
  /* Navigation */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow);
    z-index: 1000;
    padding-block: 1rem;
  }

  .navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(8px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  }
  
  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 700;
    color: var(--secondary);
    text-decoration: none;
  }
  
  .nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
  }
  
  .nav-links a {
    text-decoration: none;
    color: var(--secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }
  
  .nav-links a:hover,
  .nav-links a.active {
    color: var(--primary);
  }
  
  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
  }
  
  .nav-links a:hover::after,
  .nav-links a.active::after {
    width: 100%;
  }
  
  .mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary);
  }
  
  /* Footer */
  .footer {
    background: var(--secondary);
    color: white;
    padding-block: 2rem;
    text-align: center;
  }
  
  .footer-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    list-style: none;
  }
  
  .footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
  }
  
  .footer-links a:hover {
    color: var(--primary);
  }
  
  .social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
  }
  
  .social-links a {
    display: grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
  }
  
  .social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
  }
  
  /* ===== MEDIA QUERIES ===== */
  @media (max-width: 768px) {
    .nav-links {
      position: fixed;
      top: 5rem;
      left: 0;
      right: 0;
      background: white;
      flex-direction: column;
      align-items: center;
      padding: 2rem;
      gap: 1.5rem;
      box-shadow: var(--shadow);
      transform: translateY(-150%);
      transition: transform 0.3s ease-out;
    }
  
    .nav-links.active {
      transform: translateY(0);
    }
  
    .mobile-menu-btn {
      display: block;
    }
  
    .section {
      padding-block: 3rem;
    }
  }
  
  @media (max-width: 576px) {
    .section {
      padding-block: 2rem;
    }
    
    .btn {
      padding: 0.6rem 1.2rem;
    }
  }