:root {
    --primary-color: #E63946;
    /* Assuming a Red/Orange from the 'Global Rise' name which often implies sunrise/energy, or similar to Save the Children red. Adjust to match logo. */
    --secondary-color: #1D3557;
    /* Dark Blue for text/contrast */
    --accent-color: #F1FAEE;
    /* Light background */
    --text-color: #333333;
    --white: #ffffff;
    --header-height: 80px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    /* Fallback to system fonts if no Google Font is loaded yet */
}

body {
    background-color: var(--accent-color);
    color: var(--text-color);
}

/* Header Styles */
.site-header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 90px;
    /* Adjust based on logo aspect ratio */
    width: auto;
}

/* Navigation - Desktop */
.main-nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 25px;
}

.nav-links li a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    position: relative;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-links li a:hover::after {
    width: 100%;
}

.nav-links li a:hover {
    color: var(--primary-color);
}

/* Donate Button */
.btn-donate {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    border: 2px solid var(--primary-color);
    text-transform: uppercase;
    font-size: 14px;
    letter-spacing: 0.5px;
}

.btn-donate:hover {
    background-color: transparent;
    color: var(--primary-color);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 24px;
    color: var(--secondary-color);
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
    .desktop-nav {
        display: none;
    }

    .menu-toggle {
        display: block;
    }
}

/* Sidebar Styles */
.mobile-sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    /* Hide off-screen */
    width: 280px;
    height: 100%;
    background-color: var(--white);
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 2000;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.mobile-sidebar.active {
    left: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.sidebar-logo img {
    height: 40px;
    width: auto;
}

.close-sidebar {
    font-size: 24px;
    cursor: pointer;
    color: var(--secondary-color);
}

.sidebar-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-links {
    list-style: none;
    margin-bottom: auto;
    /* Push donate button to bottom or just space it out */
}

.sidebar-links li {
    margin-bottom: 15px;
}

.sidebar-links li a {
    text-decoration: none;
    color: var(--secondary-color);
    font-size: 18px;
    font-weight: 500;
    display: block;
    padding: 5px 0;
    transition: var(--transition);
}

.sidebar-links li a:hover {
    color: var(--primary-color);
    padding-left: 10px;
}

.sidebar-donate {
    margin-top: 20px;
}

.sidebar-donate .btn-donate {
    display: block;
    text-align: center;
    width: 100%;
}

/* Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1500;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Dropdown Menu Styles */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 250px;
    background: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    list-style: none;
    padding: 10px 0;
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 1100;
    border-top: 3px solid var(--primary-color);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    color: #333;
    width: 100%;
    font-size: 15px;
    /* Slightly smaller than main links */
}

.dropdown-menu li a:after {
    display: none;
    /* Remove main nav underline effect */
}

.dropdown-menu li a:hover {
    background: #f4f6f8;
    color: var(--primary-color);
    padding-left: 25px;
    /* Subtle movement */
}