:root {
    --primary-color: #0071e3;
    --text-color: #1d1d1f;
    --background-color: #ffffff;
    --section-bg: #f5f5f7;
    --spacing-unit: 2rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Navigation */
.nav-header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    z-index: 1000;
}

.main-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-unit);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-links a {
    margin-left: 2rem;
    text-decoration: none;
    color: var(--text-color);
    font-size: 1rem;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    padding: 8rem var(--spacing-unit) 4rem;
    text-align: center;
    background-color: var(--background-color);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.5rem;
    color: #86868b;
    max-width: 600px;
    margin: 0 auto;
}

/* Tool Sections */
.tool-section {
    display: flex;
    align-items: center;
    padding: 6rem var(--spacing-unit);
    background-color: var(--section-bg);
}

.tool-section:nth-child(even) {
    background-color: var(--background-color);
}

.tool-section.reverse {
    flex-direction: row-reverse;
}

.content-wrapper {
    flex: 1;
    padding: 2rem;
}

.tool-image {
    flex: 1;
    padding: 2rem;
}

.tool-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s ease;
}

.tool-image img:hover {
    transform: scale(1.02);
}

.tool-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.tool-section p {
    font-size: 1.125rem;
    color: #515154;
    margin-bottom: 2rem;
    max-width: 500px;
}

.cta-button {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 980px;
    font-size: 1.125rem;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background-color: #0077ed;
    transform: scale(1.02);
}

/* Footer */
footer {
    padding: 2rem var(--spacing-unit);
    background-color: var(--section-bg);
    color: #86868b;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.friend-links {
    width: 100%;
    text-align: center;
}

.friend-links h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.links-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.links-container a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.links-container a:hover {
    color: #0077ed;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.25rem;
    }
    
    .tool-section {
        flex-direction: column;
        padding: 4rem var(--spacing-unit);
    }
    
    .tool-section.reverse {
        flex-direction: column;
    }
    
    .content-wrapper {
        padding: 1rem 0;
    }
    
    .tool-image {
        width: 100%;
        padding: 1rem 0;
    }
    
    .tool-section h2 {
        font-size: 2rem;
    }
    
    .nav-links {
        display: none;
    }
}

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

.tool-section {
    animation: fadeIn 0.8s ease-out;
}