:root {
    /* Updated Color Palette */
    --primary-color: #2563eb;  /* More vibrant blue */
    --primary-dark: #1d4ed8;
    --primary-darker: #1e40af;
    --text-color: #1f2937;     /* Dark gray instead of pure black */
    --bg-color: #f8fafc;       /* Lighter background */
    --white: #ffffff;
    --gray-light: #f3f4f6;
    --gray-medium: #e5e7eb;
    --accent-color: #ec4899;   /* For interactive elements */
    
    /* Updated Shadows and Spacing */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-width: 280px;
    --border-radius: 8px;
    --container-max-width: 1200px;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, 
                 Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
    line-height: 1.7;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Layout Components */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    position: relative;
    box-shadow: var(--shadow-md);
    margin-left: var(--nav-width);
    z-index: 50;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    padding: 0 1.5rem;
}

.logo {
    height: 50px;
    width: auto;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.language-selector {
    position: relative;
}

.language-selector select {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    background-color: var(--primary-dark);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    cursor: pointer;
    appearance: none;
    padding-right: 2rem;
    transition: var(--transition);
}

.language-selector select:hover {
    background-color: var(--primary-darker);
}

/* Navigation */
nav {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--nav-width);
    background-color: var(--primary-darker);
    color: var(--white);
    padding: 1rem 0;
    overflow-y: auto;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transform: translateX(0);
    transition: transform 0.3s ease;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0 1rem;
}

nav a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

nav a.active {
    background-color: var(--primary-color);
    font-weight: 600;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem;
    margin-left: var(--nav-width);
    transition: margin-left 0.3s ease;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: rgba(37, 99, 235, 0.1);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-medium);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-medium);
}

th {
    background-color: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

tr:hover {
    background-color: var(--gray-light);
}

/* Footer */
footer {
    background-color: var(--primary-darker);
    color: var(--white);
    padding: 2rem 0;
    margin-left: var(--nav-width);
}

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

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    text-decoration: none;
}

/* Mobile Styles */
@media (max-width: 1024px) {
    :root {
        --nav-width: 240px;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-width: 0;
    }
    
    header {
        margin-left: 0;
        padding: 1rem;
    }
    
    nav {
        transform: translateX(-100%);
        width: 280px;
    }
    
    nav.active {
        transform: translateX(0);
    }
    
    main {
        margin-left: 0;
        padding: 1rem;
    }
    
    footer {
        margin-left: 0;
    }
    
    .hamburger {
        display: block;
        background: none;
        border: none;
        color: var(--white);
        font-size: 1.5rem;
        cursor: pointer;
        margin-right: 1rem;
    }
    
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 90;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }
    
    .nav-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .logo {
        height: 40px;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.shadow { box-shadow: var(--shadow-md); }
.rounded { border-radius: var(--border-radius); }

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}