:root {
    --primary: #004d40;    /* Dark Green */
    --accent: #ffb300;     /* Gold */
    --text-dark: #1e293b;
    --text-light: #64748b;
    --white: #ffffff;
    --bg-light: #f0f4f3;   /* Very light green-grey */
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body { line-height: 1.6; color: var(--text-dark); background: var(--white); }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header & Nav */
header { background: var(--primary); padding: 1.2rem 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); }
nav { display: flex; justify-content: space-between; align-items: center; }
/*.logo { color: white; font-weight: 800; font-size: 1.4rem; text-decoration: none; }
*/.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 20px; list-style: none; }
.nav-links a { color: #e0f2f1; text-decoration: none; font-weight: 500; font-size: 0.9rem; transition: 0.3s; }
.nav-links a:hover { color: var(--accent); }

/* Buttons */
.btn { display: inline-block; padding: 10px 24px; border-radius: 4px; font-weight: 600; text-decoration: none; cursor: pointer; transition: 0.3s; }
.btn-primary { background: var(--accent); color: var(--primary); border: none; }
.btn-primary:hover { background: #e6a200; }

/* Sections */
section { padding: 80px 0; }
.hero { 
    background: linear-gradient(rgba(0, 77, 64, 0.8), rgba(0, 77, 64, 0.8)), url('https://images.unsplash.com/photo-1560518883-ce09059eeffa?auto=format&fit=crop&w=1200&q=80'); 
    background-size: cover; 
    background-position: center; 
    color: white; 
    text-align: center; 
    padding: 120px 0; 
}
.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.content-page { padding: 120px 0; }
.content-page h1 { font-size: 2.5rem; margin-bottom: 20px; color: var(--primary); }

/* Calculator Styles */
.calculator-box { 
    max-width: 500px; 
    margin: 0 auto; 
    background: white; 
    padding: 30px; 
    border-radius: 8px; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.08); 
    border-top: 5px solid var(--accent);
}
.input-group { margin-bottom: 15px; }
.input-group label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--primary); }
.input-group input, .input-group select { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid #ddd; 
    border-radius: 4px;
}
.result-group { 
    border-top: 2px dashed #eee; 
    padding-top: 20px; 
    margin-top: 20px; 
}
.result-group div { 
    display: flex; 
    justify-content: space-between; 
    margin-bottom: 10px; 
}
.result-group span.label { font-weight: 600; }
.result-group span.value { font-size: 1.3rem; font-weight: 800; color: var(--accent); }

/* Footer */
footer { background: #020617; color: #94a3b8; padding: 40px 0; font-size: 0.85rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 40px; }
.footer-grid h4 { color: var(--accent); margin-bottom: 15px; }
.footer-grid a { color: #94a3b8; text-decoration: none; display: block; margin-bottom: 8px; }

/* Media Queries */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* Simplify nav for mobile */
}