html, body, #app {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    background: #1a1a1a;
}

.map-viewport {
    flex: 1 1 auto;
    background: #0d1117;
}

.leaflet-container {
    background: #0d1117;
    outline: none;
}

.leaflet-image-layer,
.leaflet-tile {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.pubg-grid-line {
    filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.8));
}

.pubg-grid-subline {
    stroke-dasharray: 2 3;
}

.secret-room-marker {
    position: relative;
    background: transparent;
    border: 2px solid #ff4f4f;
    border-radius: 50%;
    box-shadow: 0 0 0 1px rgba(255, 0, 0, 0.3);
    transition: transform 0.1s ease;
}

.secret-room-marker::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 4px;
    height: 4px;
    background: #ff4f4f;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 0 1px rgba(255, 0, 0, 0.3);
}

.secret-room-marker:hover {
    transform: scale(1.15);
}

.pubg-grid-label {
    color: #fff;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    text-shadow: 0 0 3px rgba(0, 0, 0, 0.9), 0 0 6px rgba(0, 0, 0, 0.7);
    pointer-events: none;
    user-select: none;
    background: transparent;
    border: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    letter-spacing: 0.05em;
}

.pubg-grid-label-col {
    transform: translateY(4px);
}

.pubg-grid-label-row {
    transform: translateX(6px);
    justify-content: flex-start;
}