/* General Styling */
:root {
    --primary-color: #007bff; /* Blue */
    --secondary-color: #6c757d; /* Grey */
    --accent-color: #28a745; /* Green for buttons */
    --light-bg: #f8f9fa;
    --dark-text: #343a40;
    --white-text: #ffffff;
    --spacing-lg: 80px;
    --spacing-md: 40px;
    --spacing-sm: 20px;
}

body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--white-text);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

h1, h2, h3 {
    font-family: 'Roboto', sans-serif;
    color: var(--dark-text);
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: 2.5em;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

a:hover {
    text-decoration: underline;
}

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white-text);
    padding: 12px 25px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    text-transform: uppercase;
    font-weight: bold;
}

.btn:hover {
    background-color: #218838; /* Darker green */
    text-decoration: none;
}

.section-padding {
    padding: var(--spacing-lg) 0;
}

.bg-light {
    background-color: var(--light-bg);
}

/* Header & Navigation */
header {
    background-color: var(--dark-text);
    color: var(--white-text);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.logo h1 {
    color: var(--white-text);
    margin: 0;
    font-size: 1.8em;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

nav ul li {
    margin-left: var(--spacing-md);
}

nav ul li a {
    color: var(--white-text);
    font-weight: bold;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.menu-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--white-text);
    margin: 4px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://via.placeholder.com/1500x800?text=3D+Printer+Background') no-repeat center center/cover;
    color: var(--white-text);
    text-align: center;
    padding: var(--spacing-lg) 0;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content h2 {
    font-size: 3.5em;
    margin-bottom: var(--spacing-sm);
    color: var(--white-text);
}

.hero-content p {
    font-size: 1.3em;
    margin-bottom: var(--spacing-md);
}

/* Services Section */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    text-align: center;
}

.service-item {
    background-color: var(--white-text);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.service-item:hover {
    transform: translateY(-5px);
}

.service-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.portfolio-item {
    background-color: var(--white-text);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    overflow: hidden;
    text-align: center;
}

.portfolio-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.portfolio-item h3 {
    margin: var(--spacing-sm) 0 5px;
    color: var(--primary-color);
}

.portfolio-item p {
    padding: 0 var(--spacing-sm) var(--spacing-sm);
    font-size: 0.95em;
    color: var(--secondary-color);
}

/* About Section */
#about p {
    max-width: 800px;
    margin: 0 auto var(--spacing-sm) auto;
    text-align: center;
}

/* Contact Section */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--white-text);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: calc(100% - 20px);
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1em;
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
}

/* Footer */
footer {
    background-color: var(--dark-text);
    color: var(--white-text);
    text-align: center;
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        background-color: var(--dark-text);
        position: absolute;
        top: 60px; /* Adjust based on header height */
        left: 0;
    }

    nav ul.active {
        display: flex;
    }

    nav ul li {
        margin: 10px 0;
        text-align: center;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-content h2 {
        font-size: 2.5em;
    }

    .hero-content p {
        font-size: 1em;
    }

    h2 {
        font-size: 2em;
    }

    .section-padding {
        padding: var(--spacing-md) 0;
    }
}