.os-window {
    position: absolute;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    min-width: 500px;
    overflow: hidden;
}

.os-window-header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 8px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: grab;
    user-select: none;
    font-weight: 500;
}

.os-window-header:active {
    cursor: grabbing;
}

.os-window-close {
    cursor: pointer;
    background: transparent;
    border: none;
    color: var(--header-text);
    font-size: 1.2rem;
    line-height: 1;
    padding: 0 4px;
}

.os-window-close:hover {
    color: #e74c3c;
}

.os-window-content {
    padding: 15px;
    flex-grow: 1;
    overflow-y: auto;
}

/* Loading overlay for composition */
.loading-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(var(--panel-bg), 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    font-weight: bold;
}

@media (max-width: 768px) {
    .os-window {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        width: 100vw !important;
        height: 100vh !important;
        min-width: auto;
        border-radius: 0;
        z-index: 100 !important;
    }
}