:root {
    --primary-color: #1a1f36;
    --secondary-color: #2d5bff;
    --accent-color: #00c2ff;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --text-secondary: #6b7280;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    background-image: 
        linear-gradient(135deg, rgba(45, 91, 255, 0.05) 0%, rgba(0, 194, 255, 0.05) 100%);
    background-attachment: fixed;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Styles */
header {
    background: linear-gradient(rgba(26, 31, 54, 0.9), rgba(26, 31, 54, 0.9)),
                url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.1;
}

header h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    position: relative;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    background: linear-gradient(120deg, #ffffff, #e0e0e0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

header p {
    font-size: 1.4rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Navigation Styles */
.main-nav {
    background-color: rgba(255, 255, 255, 0.98);
    padding: 1.2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
    display: inline-block;
    text-align: center;
    min-width: 160px;
}

.main-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 50px;
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.main-nav a:hover {
    color: white;
    transform: translateY(-2px);
}

.main-nav a:hover::before {
    opacity: 1;
}

.main-nav a.active {
    color: white;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    box-shadow: 0 4px 15px rgba(45, 91, 255, 0.3);
}

.main-nav a.active:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(45, 91, 255, 0.4);
}

/* Section Styles */
.section {
    padding: 4rem 0;
    position: relative;
}

.section h2 {
    color: var(--primary-color);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 2rem;
    font-weight: 700;
}

.section h2 i {
    color: var(--secondary-color);
    font-size: 1.8rem;
}

.category {
    margin-bottom: 4rem;
}

.category h3 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--secondary-color);
    font-size: 1.5rem;
    font-weight: 600;
    display: inline-block;
}

/* Grid and Card Styles */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--secondary-color), var(--accent-color));
    opacity: 0;
    transition: var(--transition);
}

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

.card:hover::before {
    opacity: 1;
}

.card h4 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer Styles */
footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2c3e50 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
    margin-top: 4rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.1;
}

footer p {
    position: relative;
    opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-nav ul {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        padding: 0 1rem;
    }

    .main-nav a {
        width: 100%;
        max-width: 300px;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 2.5rem;
    }

    .section {
        padding: 3rem 0;
    }

    .card {
        padding: 1.5rem;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.6s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Language Switch Styles */
.language-switch {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 1000;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.lang-btn.active {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Responsive Design for Language Switch */
@media (max-width: 768px) {
    .language-switch {
        position: relative;
        top: 0;
        right: 0;
        justify-content: center;
        margin-bottom: 20px;
    }
}