/* Base Variables & Reset */
:root {
    --primary: #004b87; /* Corporate Blue */
    --secondary: #00a0e3; /* Light Blue */
    --accent: #f2a900; /* Warm Accent */
    --dark: #1a1a1a;
    --light: #f8f9fa;
    --gray: #6c757d;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body { color: var(--dark); line-height: 1.6; background-color: #fff; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
a { text-decoration: none; }
.container { width: 90%; max-width: 1200px; margin: 0 auto; }

/* Top Bar */
.top-bar { background-color: var(--dark); color: white; font-size: 0.85rem; padding: 8px 0; }
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar i { margin-right: 5px; color: var(--secondary); }

/* Navigation & Submenu */
nav { background: white; box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
.nav-container { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }
.logo { font-size: 1.8rem; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 1px; }
.logo span { color: var(--secondary); }

.nav-links { list-style: none; display: flex; gap: 30px; align-items: center; margin: 0; padding: 0;}
.nav-links li { position: relative; padding: 10px 0; }
.nav-links a { color: var(--dark); font-weight: 600; font-size: 0.95rem; transition: color 0.3s; }
.nav-links a:hover { color: var(--primary); }

/* Dropdown Menu CSS */
.dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    min-width: 250px;
    border-top: 3px solid var(--primary);
    border-radius: 0 0 4px 4px;
    padding: 10px 0;
    z-index: 1001;
}
.dropdown li { padding: 0; }
.dropdown a {
    display: block;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: 1px solid #eee;
}
.dropdown a:hover { background: var(--light); color: var(--primary); padding-left: 25px; transition: all 0.3s; }
.nav-links li:hover .dropdown { display: block; }

/* Buttons */
.btn { padding: 12px 28px; background: var(--primary); color: white; border: none; border-radius: 4px; font-weight: 600; cursor: pointer; transition: background 0.3s; display: inline-block; }
.btn:hover { background: var(--secondary); }

/* Page Headers (For sub-pages) */
.page-header { background: var(--primary); color: white; padding: 60px 0; text-align: center; }
.page-header h1 { font-size: 2.5rem; margin-bottom: 10px; }

/* Sections */
.section-padding { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 { font-size: 2.2rem; color: var(--primary); margin-bottom: 15px; }

/* Footer */
footer { background: #111; color: #888; text-align: center; padding: 30px 0; font-size: 0.9rem; margin-top: auto;}

/* Responsive */
@media (max-width: 900px) {
    .nav-links { display: none; } /* Mobile menu requires JS, hidden for simplicity here */
}