/* Base Layout */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.2em;
    margin-bottom: 5px;
}

header .subtitle {
    font-size: 1em;
    color: #555;
}

/* Cards */
.card {
    background-color: #fff;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
}

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

th {
    background-color: #f7f7f7;
    color: #333;
}

tr:hover {
    background-color: #f1f1f1;
}

/* Buttons */
button {
    background-color: #4CAF50;
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

/* Drift Chart */
#drift-chart {
    min-height: 300px;
}

/* Responsive */
@media(max-width: 768px){
    .container {
        padding: 0 10px;
    }

    table, th, td {
        font-size: 0.9em;
    }
}

/* Footer */
footer {
    text-align: center;
    font-size: 0.85em;
    color: #777;
    margin-top: 40px;
}