:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.main-content {
    margin-top: calc(var(--spacing-xl) * 2);
    min-height: calc(100vh - 200px);
    padding: 0 var(--spacing-sm);
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 1030;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.navbar.scrolled {
    background-color: rgba(74, 20, 140, 0.95) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.4rem;
    transition: var(--transition-base);
    padding: 0.5rem 0;
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

.navbar.scrolled .navbar-brand {
    font-size: 1.2rem;
}

.navbar .container {
    padding: 0.5rem 0;
}

.navbar-nav .nav-link {
    padding: 0.5rem 1rem !important;
}

.navbar .navbar-toggler {
    padding: 0.25rem 0.5rem;
    margin: 0;
}

.card {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-lg);
    transition: var(--transition-base);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.btn {
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: var(--transition-base);
    padding: 0.5rem 1.25rem;
}

.btn:hover {
    transform: translateY(-2px);
}

footer {
    background-color: #212529 !important;
    padding: var(--spacing-lg) 0;
}

/* Sticky Navbar Adjustments */
body {
    padding-top: 0;
}

.navbar-sticky {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1030;
}

/* Add body padding when navbar is sticky */
body.navbar-sticky-active {
    padding-top: calc(70px + var(--spacing-xl));
}

@media (max-width: 991px) {
    body.navbar-sticky-active {
        padding-top: calc(60px + var(--spacing-lg));
    }
}

/* Modern Responsive Breakpoints */
@media (max-width: 576px) {
    .main-content {
        margin-top: calc(var(--spacing-md) * 1.5);
        padding: 0 var(--spacing-xs);
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .card {
        margin-bottom: var(--spacing-md);
    }
    
    .navbar-brand {
        font-size: 1.1rem;
        padding: 0.3rem 0;
    }
    
    .navbar .container {
        padding: 0.3rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.3rem 0.6rem !important;
    }
}

@media (max-width: 768px) {
    .main-content {
        margin-top: calc(var(--spacing-lg) * 1.5);
    }
    
    .navbar-brand {
        font-size: 1.2rem;
        padding: 0.4rem 0;
    }
    
    .navbar .container {
        padding: 0.4rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.4rem 0.8rem !important;
    }
}

@media (min-width: 768px) and (max-width: 992px) {
    .main-content {
        padding: 0 var(--spacing-md);
    }
}

@media (min-width: 992px) {
    .main-content {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1200px) {
    .main-content {
        padding: 0 var(--spacing-xl);
    }
}

/* Touch-friendly interactions */
@media (hover: none) {
    .card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}