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

:root {
    --primary-color: #003366;;
    --secondary-color: #005a87;
    --accent-color: #FFC72C;
    --light-color: #f5f9fc;
    --dark-color: #333;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.5s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
}

/* Navbar */
.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 9px;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    background-color: var(--accent-color);
}

/* Hero Section */
.hero {
    height: 70vh;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url(./foto/pens2.jpg);
    background-size: auto;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    color: white;
    text-align: center;
}

.hero-content {
    z-index: 2;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 0.1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    opacity: 0.9;
}

/* Main Section */
.main-section {
    max-width: 1600px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

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

.smart-card {
    background: white;
    border-radius: 20px;
    padding: 2rem 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.smart-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
}

.smart-card:hover {
    background-color: var(--accent-color);
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.card-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background-color: rgba(0, 120, 179, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.card-icon svg {
    width: 35px;
    height: 35px;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.card-desc {
    color: var(--primary-color);
    line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 778px) {
    .nav-container {
        padding: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .main-section {
        margin: 2rem auto;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .cards-container {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.5rem;
    }
    
    .smart-card {
        padding: 1.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-link {
        padding: 0.5rem;
    }
    
    .hero {
        height: 60vh;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .cards-container {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 2rem 1.5rem;
    }
}