body {
    font-family: 'Inter', Arial, sans-serif;
    background: #f8fafc;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.header {
    width: 900px;
    margin-bottom: 20px;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.procedure {
    font-size: 16px;
    color: #ef4444; /* Red color from image */
    line-height: 1.6;
    font-weight: 600;
}

.procedure u {
    color: #0f172a;
    font-size: 18px;
    text-decoration-thickness: 2px;
}

.container {
    width: 900px;
    height: 650px;
    position: relative;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.svg-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.pipe {
    fill: none;
    stroke: #cbd5e1;
    stroke-width: 8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.wire {
    fill: none;
    stroke: #ef4444;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* UI Elements */
.element {
    position: absolute;
    z-index: 10;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    text-align: center;
    border-radius: 8px;
}

.tank {
    border: 3px solid #1e3a8a; /* Dark blue */
    color: #dc2626; /* Red text */
}

.buchholz-relay {
    border: 3px solid #16a34a; /* Green */
    flex-direction: column;
    justify-content: flex-start;
    padding: 5px;
    background: white;
    box-sizing: border-box;
}

.relay-core {
    width: 100%;
    height: 100%;
    position: relative;
    border: 1px solid #ccc;
    background: #e2e8f0; /* Empty color (gas) */
    overflow: hidden;
}

.relay-oil {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #2563eb; /* Blue oil */
    transition: height 0.3s linear;
}

.relay-scale {
    position: absolute;
    right: -45px;
    top: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-size: 11px;
    color: #000;
    font-weight: normal;
}

.valve {
    width: 40px;
    height: 40px;
    border: 2px solid #000;
    background: white;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.valve:hover {
    background: #f1f5f9;
}

.valve-inner {
    width: 24px;
    height: 24px;
    background: #000;
    border-radius: 50%;
    position: relative;
}

.valve-line {
    position: absolute;
    width: 32px;
    height: 4px;
    background: #000;
    top: 10px;
    left: -4px;
    transition: transform 0.3s ease;
}

.valve.closed .valve-line {
    transform: rotate(90deg);
}

.valve-label {
    position: absolute;
    top: -20px;
    color: #dc2626;
    font-size: 14px;
    font-weight: bold;
}

.indicator-box {
    border: 3px solid #1e3a8a;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #dc2626;
}

.light {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-bottom: 8px;
    background-color: #e2e8f0;
    border: 2px solid #cbd5e1;
    transition: background-color 0.3s;
}

.light.alarm-on {
    background-color: #facc15; /* Yellow */
    box-shadow: 0 0 15px #facc15;
    animation: blinkYellow 1s infinite;
}

.light.trip-on {
    background-color: #ef4444; /* Red */
    box-shadow: 0 0 15px #ef4444;
    animation: blinkRed 1s infinite;
}

@keyframes blinkYellow {
    0%, 100% { background-color: #facc15; box-shadow: 0 0 15px #facc15; }
    50% { background-color: #fef08a; box-shadow: 0 0 5px #fef08a; }
}

@keyframes blinkRed {
    0%, 100% { background-color: #ef4444; box-shadow: 0 0 15px #ef4444; }
    50% { background-color: #fca5a5; box-shadow: 0 0 5px #fca5a5; }
}

.pump-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #dc2626;
    cursor: pointer;
    transition: transform 0.1s;
}

.pump-container:active {
    transform: scale(0.95);
}

.pump-icon {
    width: 60px;
    height: 40px;
    background: #fff;
    border: 3px solid #1e3a8a;
    border-radius: 8px;
    position: relative;
    margin-bottom: 5px;
}

.pump-icon::after {
    content: '';
    position: absolute;
    left: -15px;
    top: 15px;
    width: 15px;
    height: 4px;
    background: #1e3a8a;
}

.status-panel {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 20;
    background: white;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border: 1px solid #e2e8f0;
}

.status-text {
    font-weight: bold;
    color: #0f172a;
    margin-bottom: 8px;
}

.refresh-btn {
    padding: 6px 12px;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}

.refresh-btn:hover {
    background: #e2e8f0;
}

.nav-back {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    background: #3b82f6;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s;
}

.nav-back:hover {
    background: #2563eb;
}