:root {
    --primary-bg: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --label-color: #555;
    --border-color: #e0e0e0;
    --accent-color: #007bff; /* A generic accent, can be themed */
    --green-status: #28a745;
    --red-status: #dc3545;
    --grey-status: #888;
    --button-bg: #007bff;
    --button-text: #ffffff;
    --secondary-button-bg: #6c757d; /* Added for secondary buttons */
    --header-height: 60px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--primary-bg);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: var(--header-height); /* Space for fixed header */
}

header {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 0 20px;
    height: var(--header-height);
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    box-sizing: border-box;
}

#appTitle {
    font-size: 1.5em;
    font-weight: bold;
}

#burgerMenuBtn {
    font-size: 1.8em;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.settings-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: 250px;
    background-color: var(--card-bg);
    box-shadow: -2px 2px 5px rgba(0,0,0,0.1);
    z-index: 999;
    border-left: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.settings-menu button {
    display: block;
    width: 100%;
    padding: 15px 20px;
    text-align: left;
    background: none;
    border: none;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 1em;
}
.settings-menu button:last-child {
    border-bottom: none;
}
.settings-menu button:hover {
    background-color: #f0f0f0;
}

main {
    width: 100%;
    max-width: 600px;
    padding: 20px;
    box-sizing: border-box;
}

.status-bar {
    background-color: var(--card-bg);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.status-bar div {
    font-weight: 500;
}

.status-connected { color: var(--green-status); }
.status-disconnected { color: var(--red-status); }
.status-armed { color: var(--green-status); font-weight: bold; } /* Armed is green */
.status-disarmed { color: var(--red-status); font-weight: bold; } /* Disarmed is red */
.old-data .value { color: var(--grey-status) !important; }


/* Generic Action Button Style */
.action-button {
    display: block;
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    font-weight: bold;
    color: var(--button-text);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 20px;
    transition: filter 0.2s;
    text-align: center;
    text-decoration: none;
    box-sizing: border-box;
}
.action-button:hover {
    filter: brightness(0.9);
}

/* Specific Button Colors */
#armDisarmButton {
    background-color: var(--button-bg);
}

#engineersModeBtn {
    /* background-color: var(--secondary-button-bg); */
    background-color: var(--button-bg);
}

.info-block {
    background-color: var(--card-bg);
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.info-block h2 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.3em;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.data-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
}
.data-row:last-child {
    border-bottom: none;
}

.data-row .label {
    color: var(--label-color);
    font-weight: 500;
}

.data-row .value {
    font-weight: bold;
    text-align: right;
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}