:root {
    --primary-color: #007bff;
    --border-color: #dee2e6;
    --background-color: #f8f9fa;
    --text-color: #212529;
    --white: #fff;
    --danger-color: #dc3545;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
    color: var(--text-color);
}

header nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input[type="text"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box; /* Important */
}

select[multiple] {
    height: 100px;
    padding: 5px;
}

button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

.danger-btn {
    background-color: var(--danger-color);
}

.danger-btn:hover {
    background-color: #c82333;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 20px;
}

th, td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
}

th {
    background-color: var(--background-color);
}

#results, #admin-content {
    display: none;
}

#error-message {
    color: var(--danger-color);
    margin-top: 10px;
}

#error-message-login {
    color: var(--danger-color);
    margin-top: 10px;
}

.trader-status {
    font-size: 0.9em;
    color: #6c757d;
}

label.tooltip-container {
    display: inline-block;
}

.tooltip-container {
    position: relative;
    display: inline-block;
    border-bottom: 2px dotted #ccc; /* light grey dotted underline */
    cursor: help; /* indicates extra info is available */
}

.tooltip-container .tooltip-text {
    visibility: hidden;
    opacity: 0;
    width: 240px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 8px 12px;
    position: absolute;
    z-index: 1;
    bottom: 140%;
    left: 50%;
    margin-left: -120px;
    transition: opacity 0.3s;
    font-size: 0.85rem;
    font-weight: normal;
    line-height: 1.4;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.tooltip-container .tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #333 transparent transparent transparent;
}

.tooltip-container:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}