:root {
    --primary: #ff9800; /* Kolor spawalniczy/pomarańcz */
    --dark: #121212;
    --dark-grey: #1e1e1e;
    --light: #f5f5f5;
    --text-grey: #b0b0b0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Montserrat', sans-serif; background-color: var(--dark); color: var(--light); line-height: 1.6; }

/* Nawigacja */
nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 5%; background: rgba(18,18,18,0.95); position: fixed; width: 100%; top: 0; z-index: 1000; border-bottom: 1px solid #333;
}
.logo { font-weight: 900; font-size: 1.5rem; letter-spacing: 2px; }
.highlight { color: var(--primary); }
.menu a { color: var(--light); text-decoration: none; margin-left: 20px; font-weight: 500; transition: 0.3s; }
.menu a:hover { color: var(--primary); }
.btn-nav { border: 1px solid var(--primary); padding: 8px 20px; border-radius: 4px; }

/* Hero Section */
.hero {
    height: 100vh; display: flex; align-items: center; justify-content: center;
    background: url('https://images.unsplash.com/photo-1504328345606-18bbc8c9d7d1?q=80&w=2070&auto=format&fit=crop') no-repeat center center/cover;
    position: relative; text-align: center; margin-top: 60px;
}
.overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); }
.hero-content { position: relative; z-index: 2; max-width: 800px; padding: 20px; }
h1 { font-size: 3.5rem; font-weight: 900; line-height: 1.1; margin-bottom: 20px; text-transform: uppercase; }
.hero p { font-size: 1.2rem; margin-bottom: 30px; color: var(--text-grey); }

/* Przyciski */
.btn { display: inline-block; padding: 12px 30px; text-decoration: none; font-weight: 700; border-radius: 4px; transition: 0.3s; margin: 5px; cursor: pointer; border: none; font-family: inherit; font-size: 1rem; }
.btn-primary { background: var(--primary); color: #000; }
.btn-primary:hover { background: #e68900; }
.btn-outline { border: 2px solid var(--light); color: var(--light); }
.btn-outline:hover { background: var(--light); color: #000; }

/* USP */
.usp { background: var(--dark-grey); padding: 60px 0; border-bottom: 1px solid #333; }
.usp .container { display: flex; justify-content: space-around; flex-wrap: wrap; text-align: center; max-width: 1200px; margin: 0 auto; }
.usp-item { flex: 1; min-width: 250px; padding: 20px; }
.usp-item i { font-size: 2.5rem; color: var(--primary); margin-bottom: 15px; }

/* Sekcje ogólne */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
section { padding: 80px 0; }
h2 { font-size: 2.5rem; text-align: center; margin-bottom: 50px; text-transform: uppercase; letter-spacing: 1px; }

/* Grid Produktów */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: var(--dark-grey); padding: 20px; border: 1px solid #333; transition: 0.3s; }
.card:hover { transform: translateY(-5px); border-color: var(--primary); }
.card-img { height: 250px; margin-bottom: 20px; background: #2a2a2a; } /* Placeholder */
.card h3 { margin-bottom: 10px; }

/* Kalkulator */
.calculator-section { background: #151515; }
.calc-wrapper { display: flex; flex-wrap: wrap; gap: 40px; background: var(--dark-grey); padding: 40px; border-radius: 8px; border: 1px solid #333; }
#rimForm { flex: 1; min-width: 300px; display: flex; flex-direction: column; gap: 15px; }
.calc-info { flex: 1; min-width: 300px; border-left: 1px solid #444; padding-left: 40px; display: flex; flex-direction: column; justify-content: center; }
input, select { padding: 12px; background: #2a2a2a; border: 1px solid #444; color: white; border-radius: 4px; font-family: inherit; }
.price-box { font-size: 1.5rem; margin: 20px 0; font-weight: bold; }
.price { color: var(--primary); font-size: 2.5rem; }

/* Footer */
footer { background: #000; padding: 60px 0 20px; color: var(--text-grey); }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 30px; margin-bottom: 40px; }
.copyright { text-align: center; border-top: 1px solid #333; padding-top: 20px; font-size: 0.9rem; }

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    .calc-info { border-left: none; padding-left: 0; border-top: 1px solid #444; padding-top: 30px; }
    .menu { display: none; } /* Uproszczenie na start */
}