:root {
    --primary-color: #225588;
    --secondary-color: #4477aa;
    --text-color: #333;
    --background-color: #f5f5f5;
    --card-background: #ffffff;
}

* {
    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);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.logo-container {
    margin-bottom: 1.5rem;
}

.logo {
    width: 120px;
    height: 120px;
    border-radius: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    background-color: white;
    padding: 12px;
}

.subtitle {
    margin-top: 1rem;
    font-size: 1.2rem;
}

section {
    padding: 4rem 0;
}

.hero {
    background-color: white;
    text-align: center;
}

.qr-section {
    max-width: 400px;
    margin: 0 auto;
}

.qr-code {
    width: 200px;
    height: 200px;
    margin-bottom: 1rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 1rem;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: var(--secondary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
    background-color: var(--card-background);
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: bold;
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

.author-info {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.author-info a {
    color: white;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    transition: border-color 0.3s;
}

.author-info a:hover,
.author-info a:visited {
    color: white;
    border-color: white;
}

@media (max-width: 768px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 2rem 0;
    }
}

.main-nav {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo {
    width: 40px;
    height: 40px;
}

.nav-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-right {
    display: flex;
    gap: 2rem;
}

.nav-right a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

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

@media (max-width: 768px) {
    .main-nav {
        padding: 0.8rem 0;
    }

    .main-nav .container {
        flex-direction: column;
        gap: 0.8rem;
    }
    
    .nav-right {
        gap: 1.5rem;
    }
    
    .nav-title {
        font-size: 1.1rem;
    }
}

.contact {
    background-color: white;
    text-align: center;
}

.contact .container {
    max-width: 800px;
}

.contact h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.contact-text {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

.contact-text p {
    margin-bottom: 1rem;
}

.contact-button {
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .nav-right {
        gap: 1rem;
    }
    
    .nav-title {
        font-size: 1rem;
    }
}