:root {
    --primary-color: #1680f2;
    --secondary-color: #0a2c4e;
    --background-color: #f4f7f9;
    --text-color: #333;
    --light-text-color: #fff;
    --card-bg: #ffffff;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s ease;
}

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

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2.5rem;
    color: var(--secondary-color);
}

#hero {
    background: linear-gradient(rgba(10, 44, 78, 0.8), rgba(10, 44, 78, 0.8)), url('https://images.unsplash.com/photo-1549492423-400212a6e5a5?q=80&w=2070&auto=format&fit=crop') no-repeat center center/cover;
    color: var(--light-text-color);
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 0;
}

#hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

#hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--light-text-color);
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.btn:hover {
    transform: translateY(-3px);
    background-color: #0759b0;
}

#features {
    padding: 5rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

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

#about {
    background-color: var(--secondary-color);
    color: var(--light-text-color);
    padding: 5rem 0;
    text-align: center;
}

#about .section-title {
    color: var(--light-text-color);
}

#about p {
    max-width: 700px;
    margin: 0 auto;
}

#contact {
    padding: 5rem 0;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: 'Poppins', sans-serif;
}

.contact-form button {
    cursor: pointer;
    border: none;
    align-self: flex-start;
}

footer {
    background-color: var(--text-color);
    color: var(--light-text-color);
    text-align: center;
    padding: 2rem 0;
}

.fade-in-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-element.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.menu-toggle, .menu-close {
    display: none;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--secondary-color);
}

.close-menu-li {
    display: none;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        z-index: 101;
    }

    nav ul {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--card-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
    }

    nav ul.nav-active {
        right: 0;
    }

    .close-menu-li {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1.5rem;
    }

    .menu-close {
        display: block;
    }
    
    #hero h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}