:root {
    --primary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --bg-light: #f4f6f8;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #27ae60;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --spacing-unit: 1rem;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
}

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

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--accent-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: background-color 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--primary-color);
}

/* Header */
header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.nav-links a {
    margin-left: 20px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.8)), url('../images/hero.png');
    background-size: cover;
    background-position: center;
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Features */
.features {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

/* Pricing */
.pricing {
    padding: 80px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pricing-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    transition: transform 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-color: var(--accent-color);
}

.pricing-card.popular {
    border: 2px solid var(--accent-color);
    position: relative;
}

.pricing-card.popular::after {
    content: 'Most Popular';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: var(--white);
    padding: 4px 12px;
    font-size: 0.8rem;
    border-radius: 12px;
}

.price {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin: 20px 0;
}

.price span {
    font-size: 1rem;
    color: #7f8c8d;
    font-weight: 400;
}

.specs-list {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.specs-list li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

.specs-list li:last-child {
    border-bottom: none;
}

/* Order Form Section */
.order-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.order-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
}

.invoice-summary {
    background: white;
    padding: 40px;
    max-width: 800px;
    margin: 50px auto;
    border: 1px solid #ddd;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 20px;
    margin-bottom: 30px;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* Simple mobile hide for now */
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}