:root {
    --primary-color: #003366;
    --secondary-color: #FFD700;
    --text-color: #333;
    --bg-light: #f4f7f6;
    --white: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--bg-light);
}

header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav a, header nav ul li a {
    color: var(--white);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
}

header nav a:hover {
    color: var(--secondary-color);
}

.hero-slider, .unit-slider {
    height: 400px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
}

section {
    padding: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.card, .menu-card, .message-box {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    font-size: 0.9rem;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--primary-color);
    color: white;
    padding: 20px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar ul li a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar ul li a:hover {
    background-color: rgba(255,255,255,0.1);
}

.content {
    flex: 1;
    padding: 30px;
}

.welcome-banner {
    background: linear-gradient(135deg, var(--primary-color), #00509e);
    color: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}