:root {
    --bg-color: #000000;
    --card-bg: #111111;
    --text-main: #ffffff;
    --text-muted: #888888;
    --border-color: #333333;
    --accent: #ffffff;
    --error: #ff4444;
    --success: #00cc66;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: monospace, sans-serif;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

h2 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 20px;
    /* Square corners specifically requested */
    border-radius: 0; 
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-family: inherit;
    border-radius: 0;
    outline: none;
    transition: border-color 0.2s;
}

input:focus {
    border-color: var(--accent);
}

.btn {
    display: inline-block;
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--accent);
    padding: 10px 20px;
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    text-transform: uppercase;
    transition: all 0.2s;
    border-radius: 0;
    width: 100%;
    margin-top: 10px;
}

.btn:hover {
    background-color: var(--accent);
    color: var(--bg-color);
}

.btn:disabled {
    border-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    background-color: transparent;
}

.status {
    margin-top: 10px;
    font-size: 0.9rem;
    min-height: 20px;
}

.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
    margin-top: 20px;
}