/* Base Layout */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #fdfdfd;
    color: #111;
    line-height: 1.6;
}

/* Navigation */
nav {
    background: #222;
    color: #fff;
    padding: 0 20px;
    height: 50px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav a {
    color: #ccc;
    text-decoration: none;
    padding: 0 15px;
    font-size: 14px;
    font-weight: 500;
    height: 100%;
    display: flex;
    align-items: center;
    transition: color 0.2s, background 0.2s;
}

nav a:hover, nav a.active {
    color: #fff;
    background: #333;
}

nav .brand {
    font-weight: bold;
    color: #fff;
    margin-right: 20px;
    border-right: 1px solid #444;
    padding-right: 20px;
}

nav .dropdown {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

nav .dropdown-content {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    background-color: #333;
    min-width: 160px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    z-index: 100;
}

nav .dropdown:hover .dropdown-content {
    display: block;
}

nav .dropdown-content a {
    height: 40px;
    padding: 10px 15px;
    border-top: 1px solid #444;
}

/* Container */
.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
    min-height: 80vh;
}

/* Headings */
h1, h2, h3 {
    border-bottom: 2px solid #333;
    padding-bottom: 10px;
    margin-top: 30px;
}

h1 { font-size: 2em; margin-bottom: 0.5em; }

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 30px;
    font-size: 0.9em;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px 12px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
    font-weight: 600;
}

tr:nth-child(even) { background-color: #fcfcfc; }

/* Metrics */
.neg { color: #d00; font-weight: bold; }
.pos { color: #080; font-weight: bold; }
.neu { color: #666; }

/* Boxes */
.box {
    background: #f9f9f9;
    padding: 20px;
    border: 1px solid #eee;
    margin-bottom: 20px;
    border-radius: 4px;
}

.intro-box {
    background: #eef;
    border-left: 5px solid #44a;
    padding: 20px;
    margin-bottom: 30px;
}

/* Footer */
footer {
    background: #eee;
    color: #666;
    text-align: center;
    padding: 20px;
    font-size: 0.8em;
    margin-top: 50px;
    border-top: 1px solid #ddd;
}