:root {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #ffffff;
    --primary: #00bcd4;
    --danger: #ff5252;
    --success: #4caf50;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
}

header {
    background-color: var(--card-bg);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 { margin: 0; font-size: 1.2rem; }

/* Status Badge */
.status-badge {
    font-size: 0.8rem;
    padding: 5px 10px;
    border-radius: 15px;
    background: #444;
}
.status-badge.connected { color: var(--success); border: 1px solid var(--success); }
.status-badge.disconnected { color: var(--danger); border: 1px solid var(--danger); }

/* Grid Layout */
.sensors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    padding: 20px;
}

/* Sensor Card */
.sensor-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s;
    border: 1px solid #444;
}

.sensor-card:active { transform: scale(0.98); }

.sensor-name { font-size: 0.9rem; color: #aaa; margin-bottom: 10px; word-break: break-all; }
.sensor-value { font-size: 2rem; font-weight: bold; color: var(--primary); }
.sensor-unit { font-size: 1rem; color: #888; }
.sensor-time { font-size: 0.7rem; color: #666; margin-top: 10px; }

/* Settings Button */
#settings-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    cursor: pointer;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    width: 80%;
    max-width: 300px;
}
input { width: 100%; padding: 10px; margin: 10px 0; background: #444; border: none; color: white; }
button { width: 100%; padding: 10px; background: var(--primary); border: none; color: white; cursor: pointer; }

/* Chart Area */
.chart-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40vh;
    background: var(--card-bg);
    border-top: 2px solid var(--primary);
    padding: 10px;
    box-sizing: border-box;
    z-index: 50;
    transition: transform 0.3s;
}
.chart-container.hidden { transform: translateY(100%); }
.chart-header { display: flex; justify-content: space-between; margin-bottom: 10px; }