:root {
    --primary-color: #637141; /* Olive green from existing styles */
    --primary-hover: #8aa151;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --header-height: 70px;
    --footer-height: 60px;
    --side-margin: 30px;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif; /* Standardized font */
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden; /* Prevent body scroll, we scroll main */
}

/* Layout Wrapper */
.layout-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Sticky Header */
.layout-header {
    flex: 0 0 auto;
    height: var(--header-height);
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 var(--side-margin);
    width: 100%;
    box-sizing: border-box;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    height: 40px; /* Adjust based on actual logo ratio */
}

/* Main Content Area */
.layout-main {
    flex: 1 1 auto;
    overflow-y: auto; /* Scrollable content */
    padding: 20px var(--side-margin); /* 30px side margins */
    width: 100%;
    box-sizing: border-box;
    position: relative;
}

/* Sticky Footer */
.layout-footer {
    flex: 0 0 auto;
    height: auto;
    min-height: var(--footer-height);
    background-color: #222529;
    color: rgba(255, 255, 255, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px var(--side-margin);
    width: 100%;
    box-sizing: border-box;
    font-size: 0.875rem;
}

/* Typography & Headings */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif; /* or Roboto if preferred strictly */
    margin-top: 0;
}

/* Buttons */
.btn-modern-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
}

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

.btn-modern-white {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
}

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

/* Mobile Adjustments */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --side-margin: 15px; /* Smaller margins on mobile */
    }

    .layout-header {
        padding: 0 var(--side-margin);
    }
    
    .layout-main {
        padding: 15px var(--side-margin);
    }

    .header-content {
        /* Mobile menu layout adjustments if needed */
    }
}