:root {
    --primary-color: #00ffff; /* Bright Cyan/Aqua */
    --secondary-color: #444444; /* Dark secondary actions */
    --background-color: #000000;
    --text-color: #ffffff;
    --border-color: #1a1a1a;
    --success-color: #00ff7f; /* Bright green */
    --error-color: #ff4500; /* Bright orange/red */
    --font-size: 16px;
}

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

body, html {
    height: 100%;
    font-family: monospace, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    overflow: hidden; /* Prevent scrolling as per mobile guidelines */
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 10px;
    max-width: 600px;
    margin: 0 auto;
}

#header {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size);
    color: var(--primary-color); /* Make header info stand out */
}

#game-container {
    flex-grow: 1;
    overflow-y: auto; /* Allow content scrolling if necessary within the container */
    padding: 10px 0;
}

#footer {
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
}

button {
    background-color: var(--background-color); /* Black background */
    color: var(--primary-color); /* Bright Cyan text */
    border: 1px solid var(--primary-color);
    padding: 10px 15px;
    margin: 5px 0;
    width: 100%;
    cursor: pointer;
    font-size: var(--font-size);
    border-radius: 5px;
    min-height: 44px; /* Touch friendly size */
    transition: background-color 0.2s, color 0.2s;
}

button:hover:not(:disabled) {
    background-color: #111111; /* Slightly less black on hover */
    color: #ffffff;
}

button:disabled {
    background-color: var(--secondary-color);
    color: #888888;
    opacity: 1; /* Keep opacity 1 but use grey text */
    cursor: not-allowed;
    border-color: #333333;
}

.screen-title {
    font-size: 1.2em;
    margin-bottom: 15px;
    font-weight: bold;
}

.part-list, .inventory-list, .pc-list, .customer-list, .menu-options {
    list-style: none;
    padding: 0;
}

.list-item {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: #080808; /* Very dark grey background for list items */
}

.list-item h4 {
    margin-top: 0;
}

.action-buttons {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

.action-buttons button {
    flex-grow: 1;
    margin: 0;
    padding: 8px;
    min-height: 36px;
    width: auto;
}

.badge {
    padding: 3px 6px;
    border-radius: 3px;
    font-size: 0.8em;
    font-weight: bold;
}

.status-occupied {
    background-color: var(--error-color);
    color: white;
}

.status-idle {
    background-color: var(--success-color);
    color: white;
}

.message {
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
}

.message.success {
    background-color: #00331a; /* Dark success background */
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.message.error {
    background-color: #4d1500; /* Dark error background */
    color: var(--error-color);
    border: 1px solid var(--error-color);
}