/* ==========================================================================
   COLOR SYSTEM: LIGHT & CLEAR
   ========================================================================== */
:root {
    --primary-bg: #fdfdfd;
    --secondary-bg: #f0f2f5;
    --nav-bg: #ffffff;
    --text-main: #1a1a1a;
    --text-muted: #555555;
    --accent-border: #d1d5db;
    --hover-link: #2563eb;
}

/* Basic Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    background-color: var(--primary-bg);
    color: var(--text-main);
    /* Ensures no gaps at the edges of the window */
    margin: 0;
}

/* ==========================================================================
   FULL-WIDTH HEADER & BANNER
   ========================================================================== */
header {
    width: 100%;
    background-color: #ffffff;
    line-height: 0; /* Removes tiny gap below image */
    overflow: hidden;
}

.site-banner {
    width: 100%;       /* Spans full width of the browser */
    height: auto;      /* Maintains aspect ratio */
    display: block;    /* Removes inline spacing */
    /* Optional: Limit height so it doesn't take up the whole screen on 4k monitors */
    max-height: 450px; 
    object-fit: cover; /* Ensures image fills space without stretching */
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
nav {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--accent-border);
    padding: 0 20px;
    position: relative;
    top: 0;
    z-index: 100;		/* keeps menu above background */
    background-color: #fff;   	/* or a subtle gradient */
    width: 100%;
}

.nav-menu {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 5px;
}

.nav-menu > li > a, 
.drop-button {
    color: var(--text-main);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    padding: 18px 25px;
    display: inline-block;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-menu > li > a:hover, 
.dropdown:hover .drop-button {
    background-color: var(--secondary-bg);
    color: var(--hover-link);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    list-style: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    padding: 5px 0;
    min-width: 250px;
    display: none; 
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--accent-border);
    z-index: 200;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 14px;
}

.dropdown-menu li a:hover {
    background: var(--secondary-bg);
    color: var(--hover-link);
}

/* ==========================================================================
   CONTENT CONTAINER
   ========================================================================== */
.container {
    max-width: 1000px; /* Slightly wider for the light theme */
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.fact-card {
    background: #ffffff;
    border: 1px solid var(--accent-border);
    border-radius: 4px;
    margin-bottom: 3rem;
    overflow: hidden;
}

h2 {
    color: var(--text-main);
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.footer {
    text-align: center;
    padding: 4rem;
    background: var(--secondary-bg);
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--accent-border);
}

.article-image {
    display: block;
    width: 100%;       /* Responds to screen size */
    max-width: 600px;  /* Limits how big it can get (adjust as needed) */
    height: auto;      /* Keeps aspect ratio */
    margin: 2rem auto; /* Centers the image and adds space above/below */
    border-radius: 4px; /* Optional: matches your card style */
}